Document:

EX-10.10

 Exhibit 10.10 

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is made and entered into as
of                 , 2017, by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”), and OMS Holdings LLC, a
Delaware limited liability company (“MLP Holdco”). 
 WHEREAS, this Agreement is made in connection with the transactions
contemplated by the Contribution Agreement by and among the Partnership, MLP Holdco, Oasis Midstream Services LLC, OMP Operating LLC and OMP GP LLC, dated as
of                 , 2017 (the “Contribution Agreement”); and 

WHEREAS, the Partnership has agreed to provide the registration and other rights set forth in this Agreement for the benefit of MLP Holdco
pursuant to the Contribution Agreement. 
 NOW THEREFORE, in consideration of the mutual covenants and agreements set forth herein and for
good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged by each party hereto, the parties hereby agree as follows: 

ARTICLE I 
 DEFINITIONS

 Section 1.01. Definitions. Capitalized terms used herein without definition shall have the meanings given to them in the
Amended and Restated Agreement of Limited Partnership of the Partnership dated                 , 2017, as amended from time to time (the “Partnership
Agreement”). The terms set forth below are used herein as so defined: 
 “Affiliate” means, with respect to a
specified Person, any other Person that directly or indirectly controls, is controlled by, or is under direct or indirect common control with such specified Person. For the purposes of this definition, “control” means the power to direct
or cause the direction of the management and policies of a Person, directly or indirectly, whether through the ownership of voting securities, by contract or otherwise. 

“Agreement” has the meaning given to such term in the introductory paragraph. 

“Commission” has the meaning given to such term in Section 1.02. 

“Contribution Agreement” has the meaning given to such term in the recitals of this Agreement. 

“Effectiveness Period” has the meaning given to such term in Section 2.01. 

“Exchange Act” has the meaning given to such term in Section 2.08(a). 

“General Partner” means OMP GP LLC, as the general partner of the Partnership. 

“Holder” means the record holder of any Registrable Securities. 

 “Included Registrable Securities” has the meaning given to such term in
Section 2.03(a). 
 “Losses” has the meaning given to such term in Section 2.08(a). 

“Managing Underwriter(s)” means, with respect to any Underwritten Offering, the book-running lead manager(s) of such
Underwritten Offering. 
 “MLP Holdco” has the meaning given to such term in the introductory paragraph. 

“Notice” has the meaning given to such term in Section 2.01. 

“Offering Notice” has the meaning given to such term in Section 2.02(a). 

“Partnership” has the meaning given to such term in the introductory paragraph. 

“Person” means any individual, corporation, partnership, limited liability company, voluntary association, joint venture,
trust, limited liability partnership, unincorporated organization, government or any agency, instrumentality or political subdivision thereof, or any other form of entity. 

“Registrable Securities” means the (i) Common Units issued (or issuable) to MLP Holdco pursuant to the Contribution
Agreement (including pursuant to the Deferred Issuance and Distribution (as defined in the Contribution Agreement)); (ii) Subordinated Units; and (iii) Common Units issuable upon conversion of the Subordinated Units pursuant to the terms of the
Partnership Agreement, which Registrable Securities are subject to the rights provided herein until such rights terminate pursuant to the provisions hereof. 

“Registration Expenses” means all expenses (other than Selling Expenses) incident to the Partnership’s performance under
or compliance with this Agreement to effect the registration of Registrable Securities on a Registration Statement pursuant to Section 2.01 and/or in connection with an Underwritten Offering pursuant to Section
2.02(a), and the disposition of such Registrable Securities, including, without limitation, all registration, filing, securities exchange listing and securities exchange fees, all registration, filing, qualification and other fees and expenses
of complying with securities or blue sky laws, fees of the Financial Industry Regulatory Authority, fees of transfer agents and registrars, all word processing, duplicating and printing expenses, any transfer taxes and the fees and disbursements of
counsel and independent public accountants for the Partnership, including the expenses of any special audits or “cold comfort” letters required by or incident to such performance and compliance. 

“Registration Statement” has the meaning given to such term in Section 2.01. 

“Securities Act” has the meaning given to such term in Section 1.02. 

“Selling Expenses” means all underwriting fees, discounts and selling commissions applicable to the sale of Registrable
Securities. 
 “Selling Holder” means a Holder who is selling Registrable Securities pursuant to a Registration Statement.

  
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 “Shelf Registration Statement” has the meaning given to such term in
Section 2.01. 

“Testing-the-Waters Communication” means any
oral or written communication with potential investors undertaken in reliance on Section 5(d) of the Securities Act. 
 “Trading
Market” means the principal national securities exchange on which Registrable Securities are listed. 
 “Underwritten
Offering” means an offering (including an offering pursuant to a Registration Statement) in which Registrable Securities are sold to an underwriter on a firm commitment basis for reoffering to the public or an offering that is a
“bought deal” with one or more investment banks. 
 “Written Testing-the-Waters Communication” means any Testing-the-Waters Communication that is a written communication within the
meaning of Rule 405 under the Securities Act. 
 Section 1.02. Registrable Securities. Any Registrable Security will cease to be
a Registrable Security (a) at the time a Registration Statement covering such Registrable Security has been declared effective by the Securities and Exchange Commission (the “Commission”), or otherwise has become effective, and such
Registrable Security has been sold or disposed of pursuant to such Registration Statement; (b) at the time such Registrable Security has been disposed of pursuant to Rule 144 (or any similar provision then in effect under the Securities Act of
1933, as amended, and the rules and regulations promulgated thereunder (the “Securities Act”)); (c) 10 years after MLP Holdco ceases to be an Affiliate of the General Partner (including where the General Partner ceases to be the general
partner of the Partnership); (d) if such Registrable Security is held by the Partnership or one of its subsidiaries; (e) at the time such Registrable Security has been sold in a private transaction in which the transferor’s rights under
this Agreement are not assigned to the transferee of such securities; or (f) if such Registrable Security has been sold in a private transaction in which the transferor’s rights under this Agreement are assigned to the transferee and such
transferee is not an Affiliate of the General Partner, at the time that is two years following the later of: (i) if the Registrable Security is a Subordinated Unit, the conversion of the Subordinated Units into Common Units and (ii) the
transfer of such Registrable Security to such transferee. 
 ARTICLE II 

REGISTRATION RIGHTS 

Section 2.01. Demand Registration. Upon the written request (a “Notice”) by MLP Holdco or by any other Holder[s]
owning at least five percent (5%) of the then-outstanding Registrable Securities (subject to adjustment pursuant to Section 3.04), the Partnership shall file with the Commission, as soon as reasonably practicable, but in no event more
than 90 days following the receipt of the Notice, a registration statement (each, a “Registration Statement”) under the Securities Act providing for the resale of the Registrable Securities (which may, at the option of the Holders
giving such Notice, be a registration statement under the Securities Act that provides for the resale of the Registrable Securities pursuant to Rule 415 from time to time by the Holders (a “Shelf Registration Statement”)). The
Partnership shall use its commercially 

  
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reasonable efforts to cause each Registration Statement to be declared effective by the Commission as soon as reasonably practicable after the initial filing of the Registration Statement. Any
Registration Statement shall provide for the resale pursuant to any method or combination of methods legally available to, and requested by, the Holders of any and all Registrable Securities covered by such Registration Statement. The Partnership
shall use its commercially reasonable efforts to cause each Registration Statement filed pursuant to this Section 2.01 to be continuously effective, supplemented and amended to the extent necessary to ensure that it is available for the
resale of all Registrable Securities by the Holders until all Registrable Securities covered by such Registration Statement have ceased to be Registrable Securities (the “Effectiveness Period”). Each Registration Statement when
effective (and the documents incorporated therein by reference) shall comply as to form in all material respects with all applicable requirements of the Securities Act and shall not contain an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements therein not misleading. There shall be no limit on the number of Registration Statements that may be required by the Holders hereunder. 

Section 2.02. Underwritten Offerings. 

(a) Request for Underwritten Offering. In the event that one or more Holders collectively elect to dispose of Registrable
Securities having an aggregate value of at least five percent (5%) of the then-outstanding Registrable Securities (subject to adjustment pursuant to Section 3.04) under a Registration Statement pursuant to an Underwritten
Offering, the Partnership shall, upon written request by such Holders (“Offering Notice”), retain underwriters in order to permit such Holders to effect such sale through an Underwritten Offering. The obligation of the Partnership
to retain underwriters shall include entering into an underwriting agreement in customary form with the Managing Underwriter(s), which shall include customary indemnities in favor of, and taking all reasonable actions as are requested by, the
Managing Underwriter(s) to expedite or facilitate the disposition of such Registrable Securities. The Partnership shall, upon request of the Holders, cause its management to participate in a roadshow or similar marketing effort on behalf of the
Holders. 
 (b) Limitation on Underwritten Offerings. In no event shall the Partnership be required under Section 2.02(a)
to participate in more than two Underwritten Offerings in any twelve-month period. 
 (c) General Procedures. In connection with
any Underwritten Offering under this Agreement, the Holders of a majority of the Registrable Securities being sold in such Underwritten Offering shall be entitled, subject to the Partnership’s consent (which is not to be unreasonably withheld),
to select the Managing Underwriter(s). In connection with any Underwritten Offering under this Agreement, each Selling Holder and the Partnership shall be obligated to enter into an underwriting agreement that contains such representations and
warranties, covenants, indemnities and other rights and obligations as are customary in underwriting agreements for firm commitment offerings of securities. No Selling Holder may participate in such Underwritten Offering unless such Selling Holder
agrees to sell its Registrable Securities on the basis provided in such underwriting agreement and completes and executes all questionnaires, powers of attorney, indemnities and other documents reasonably required under the terms of such
underwriting agreement. Each Selling Holder may, at its 

  
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option, require that any or all of the representations and warranties by, and the other agreements on the part of, the Partnership to and for the benefit of such underwriters also be made to and
for such Selling Holder’s benefit and that any or all of the conditions precedent to the obligations of such underwriters under such underwriting agreement also be conditions precedent to such Selling Holder’s obligations. If any Selling
Holder disapproves of the terms of an underwriting agreement, such Selling Holder may elect to withdraw from the Underwritten Offering by notice to the Partnership and the Managing Underwriter(s); provided, however, that such withdrawal must
be made at a time prior to the time of pricing of such Underwritten Offering. No such withdrawal shall affect the Partnership’s obligation to pay Registration Expenses. 

Section 2.03. Piggyback Rights. 

(a) Participation. If the Partnership proposes to file (i) a registration statement or (ii) a prospectus supplement to
an effective Shelf Registration Statement and Holders may be included in the offering to which such prospectus supplement relates without the filing of a post-effective amendment to such Shelf Registration Statement, in each case, for the sale of
Common Units in an Underwritten Offering for its own account and/or another Person, then as soon as practicable following the engagement of counsel by the Partnership to prepare the documents to be used in connection with such Underwritten Offering,
the Partnership shall give notice (including notification by electronic mail) of such proposed Underwritten Offering to each Holder holding at least five percent (5%) of the then-outstanding Registrable Securities and such notice shall offer such
Holders the opportunity to include in such Underwritten Offering such number of Registrable Securities (the “Included Registrable Securities”) as each such Holder may request in writing; provided, however, that if the
Partnership has been advised by the Managing Underwriter(s) that the inclusion of Registrable Securities for sale for the benefit of the Holders will have an adverse effect on the price, timing or distribution of the Common Units in the Underwritten
Offering, then (A) if no Registrable Securities can be included in the Underwritten Offering in the opinion of the Managing Underwriter(s), the Partnership shall not be required to offer such opportunity to the Holders or (B) if any
Registrable Securities can be included in the Underwritten Offering in the opinion of the Managing Underwriter(s), then the amount of Registrable Securities to be offered for the accounts of Holders shall be determined based on the provisions of
Section 2.03(b). Subject to Section 2.03(b), the Partnership shall include in such Underwritten Offering all included Registrable Securities with respect to which the Partnership has received requests within two (2) Business Days
(or one (1) Business Day in connection with a “bought deal” or an “overnight” Underwritten Offering) after the Partnership’s notice has been delivered in accordance with Section 3.01. If no written request
for inclusion from a Holder is received within the specified time, each such Holder shall have no further right to participate in such Underwritten Offering. If, at any time after giving written notice of its intention to undertake an Underwritten
Offering and prior to the closing of such Underwritten Offering, the Partnership shall determine for any reason not to undertake or to delay such Underwritten Offering, the Partnership may, at its election, give written notice of such determination
to the Selling Holders and, (x) in the case of a determination not to undertake such Underwritten Offering, shall be relieved of its obligation to sell any Included Registrable Securities in connection with such terminated Underwritten Offering
and (y) in the case of a determination to delay such Underwritten Offering, shall be permitted to delay offering any Included Registrable Securities for the same period as the delay in the Underwritten Offering.

  
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Any Selling Holder shall have the right to withdraw such Selling Holder’s request for inclusion of such Selling Holder’s Registrable Securities in such Underwritten Offering by giving
written notice to the Partnership of such withdrawal at or prior to the time of pricing of such Underwritten Offering. 

(b) Priority of Registration. If the Managing Underwriter(s) of any proposed Underwritten Offering advises the Partnership that
the total amount of Registrable Securities that the Selling Holders and any other Persons intend to include in such offering exceeds the number that can be sold in such offering without being likely to have an adverse effect in any material respect
on the price, timing or distribution of the Common Units offered or the market for the Common Units, then the Common Units to be included in such Underwritten Offering shall include the number of Units that such Managing Underwriter(s) advises the
Partnership can be sold without having such adverse effect, with such number to be allocated (i) first, to the Partnership unless a Holder initiates the Underwritten Offering, in which case it shall be to the Holders, (ii) second, and if
any, the number of included Registrable Securities that, in the opinion of such Managing Underwriter(s), can be sold without having such adverse effect, with such number to be allocated pro rata among the Holders (or the Partnership if a Holder
initiates the Underwritten Offering) that have requested to participate in such Underwritten Offering based on the relative number of Registrable Securities then held by each such Holder (provided that any securities thereby allocated to a Holder
that exceed such Holder’s request shall be reallocated among the remaining requesting Holders in like manner), and (iii) if there remains availability for additional Common Units to be included in such registration, third, pro rata among
all other holders of Common Units who may be seeking to register such Common Units based on the number of Common Units such holder is entitled to include in such registration. 

Section 2.04. Delay Rights. If the General Partner determines that the Partnership’s compliance with its obligations under
this Article II would be materially detrimental to the Partnership and its Partners because such registration would (a) materially interfere with a significant acquisition, reorganization, financing or other similar transaction involving
the Partnership, (b) require premature disclosure of material information that the Partnership has a bona fide business purpose for preserving as confidential or (c) render the Partnership unable to comply with applicable securities laws,
then the Partnership shall have the right to postpone compliance with its obligations under this Article II for a period of not more than three (3) months, provided, that such right pursuant to this Section 2.04 may not be
utilized more than twice in any twelve-month period. 
 Section 2.05. Sale Procedures. In connection with its obligations under
this Article II, the Partnership will, as expeditiously as possible: 
 (a) prepare and file with the Commission such amendments
and supplements to each Registration Statement and the prospectus used in connection therewith as may be necessary to keep each Registration Statement effective for the Effectiveness Period and as may be necessary to comply with the provisions of
the Securities Act with respect to the disposition of all Registrable Securities covered by such Registration Statement; 
 (b) if a
prospectus supplement will be used in connection with the marketing of an Underwritten Offering and the Managing Underwriter(s) notifies the Partnership in writing that, 

  
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in the sole judgment of such Managing Underwriter(s), inclusion of detailed information in such prospectus supplement is of material importance to the success of the Underwritten Offering of such
Registrable Securities, use its commercially reasonable efforts to include such information in such prospectus supplement; 

(c) furnish to each Selling Holder (i) as far in advance as reasonably practicable before filing a Registration Statement or any
supplement or amendment thereto, upon request, copies of reasonably complete drafts of all such documents proposed to be filed (including exhibits and each document incorporated by reference therein to the extent then required by the rules and
regulations of the Commission), and provide each such Selling Holder the opportunity to object to any information pertaining to such Selling Holder and its plan of distribution that is contained therein and make the corrections reasonably requested
by such Selling Holder with respect to such information prior to filing a Registration Statement or supplement or amendment thereto, and (ii) such number of copies of such Registration Statement and the prospectus included therein and any
supplements and amendments thereto as such Persons may reasonably request in order to facilitate the public sale or other disposition of the Registrable Securities covered by such Registration Statement; 

(d) if applicable, use its commercially reasonable efforts to register or qualify the Registrable Securities covered by a Registration
Statement under the securities or blue sky laws of such jurisdictions as the Selling Holders or, in the case of an Underwritten Offering, the Managing Underwriter(s), shall reasonably request; provided, however, that the Partnership will not
be required to qualify generally to transact business in any jurisdiction where it is not then required to so qualify or to take any action that would subject it to general service of process in any jurisdiction where it is not then so subject; 

(e) promptly notify each Selling Holder and each underwriter, at any time when a prospectus is required to be delivered under the
Securities Act, of (i) the filing of a Registration Statement or any prospectus or prospectus supplement to be used in connection therewith, or any amendment or supplement thereto, and, with respect to such Registration Statement or any
post-effective amendment thereto, when the same has become effective; and (ii) any written comments from the Commission with respect to any filing referred to in clause (i) and any written request by the Commission for amendments or
supplements to a Registration Statement or any prospectus or prospectus supplement thereto; 
 (f) immediately notify each Selling
Holder and each underwriter, at any time when a prospectus is required to be delivered under the Securities Act, of (i) the happening of any event as a result of which the prospectus or prospectus supplement contained in a Registration
Statement, as then in effect, includes an untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading (in the case of the prospectus
contained therein, in the light of the circumstances under which a statement is made); (ii) the issuance or threat of issuance by the Commission of any stop order suspending the effectiveness of a Registration Statement, or the initiation of any
proceedings for that purpose; or (iii) the receipt by the Partnership of any notification with respect to the suspension of the qualification of any Registrable Securities for sale under the applicable securities or blue sky laws of any
jurisdiction. Following the provision of such notice, the Partnership agrees to, as promptly as practicable, amend or supplement the prospectus or 

  
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prospectus supplement or take other appropriate action so that the prospectus or prospectus supplement does not include an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements therein not misleading in the light of the circumstances then existing and to take such other commercially reasonable action as is necessary to remove a stop order,
suspension, threat thereof or proceedings related thereto; 
 (g) upon request and subject to appropriate confidentiality obligations,
furnish to each Selling Holder copies of any and all transmittal letters or other correspondence with the Commission or any other governmental agency or self-regulatory body or other body having jurisdiction (including any domestic or foreign
securities exchange) relating to any offering of Registrable Securities; 
 (h) in the case of an Underwritten Offering, furnish upon
request, (i) an opinion of counsel for the Partnership dated the date of the closing under the underwriting agreement and (ii) a “cold comfort” letter, dated the pricing date of such Underwritten Offering (to the extent
available) and a letter of like kind dated the date of the closing under the underwriting agreement, in each case, signed by the independent public accountants who have certified the Partnership’s financial statements included or incorporated
by reference into the applicable registration statement, and each of the opinion and the “cold comfort” letters shall be in customary form and covering substantially the same matters with respect to such registration statement (and the
prospectus and any prospectus supplement included therein) as have been customarily covered in opinions of issuer’s counsel and in accountants’ letters delivered to the underwriters in Underwritten Offerings of securities by the
Partnership and such other matters as such underwriters and Selling Holders may reasonably request; 
 (i) otherwise use its
commercially reasonable efforts to comply with all applicable rules and regulations of the Commission, and make available to its security holders, as soon as reasonably practicable, an earnings statement, which earnings statement shall satisfy the
provisions of Section 11(a) of the Securities Act and Rule 158 promulgated thereunder; 
 (j) make available to the appropriate
representatives of the Managing Underwriter(s) and Selling Holders access to such information and Partnership personnel as is reasonable and customary to enable such parties to establish a due diligence defense under the Securities Act; 

(k) cause all Registrable Securities registered pursuant to this Agreement to be listed on each securities exchange or nationally
recognized quotation system on which similar securities issued by the Partnership are then listed; 
 (l) use its commercially
reasonable efforts to cause the Registrable Securities to be registered with or approved by such other governmental agencies or authorities as may be necessary by virtue of the business and operations of the Partnership to enable the Selling Holders
to consummate the disposition of the Registrable Securities; 
 (m) provide a transfer agent and registrar for all Registrable
Securities covered by a Registration Statement not later than the effective date of such registration statement; and 

  
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 (n) enter into customary agreements and take such other actions as are reasonably requested
by the Selling Holders or the underwriters, if any, in order to expedite or facilitate the disposition of the Registrable Securities. 

Each Selling Holder, upon receipt of notice from the Partnership of the happening of any event of the kind described in subsection (f) of
this Section 2.05, shall forthwith discontinue disposition of the Registrable Securities by means of a prospectus or prospectus supplement until such Selling Holder’s receipt of the copies of the supplemented or
amended prospectus contemplated by subsection (f) of this Section 2.05 or until it is advised in writing by the Partnership that the use of the prospectus may be resumed, and has received copies of any additional or
supplemental filings incorporated by reference in the prospectus. 
 Section 2.06. Cooperation by Holders. The Partnership shall
have no obligation to include in a Registration Statement, or in an Underwritten Offering pursuant to Section 2.02(a), Registrable Securities of a Selling Holder who has failed to timely furnish such information that the Partnership
determines, after consultation with counsel, is reasonably required in order for the Registration Statement or prospectus supplement, as applicable, to comply with the Securities Act. 

Section 2.07. Expenses. The Partnership will pay all reasonable Registration Expenses, including in the case of an Underwritten
Offering, regardless of whether any sale is made in such Underwritten Offering. Each Selling Holder shall pay all Selling Expenses in connection with any sale of its Registrable Securities hereunder. In addition, except as otherwise provided in
Section 2.08, the Partnership shall not be responsible for legal fees incurred by Holders in connection with the exercise of such Holders’ rights hereunder. 

Section 2.08. Indemnification. 

(a) By the Partnership. In the event of a registration of any Registrable Securities under the Securities Act pursuant to this
Agreement, the Partnership will indemnify and hold harmless each Selling Holder participating therein, its directors, officers, employees and agents, and each Person, if any, who controls such Selling Holder within the meaning of the Securities Act
and the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder (the “Exchange Act”), and its directors, officers, employees or agents, against any losses, claims, damages, expenses or
liabilities (including reasonable attorneys’ fees and expenses) (collectively, “Losses”), joint or several, to which such Selling Holder, director, officer, employee, agent or controlling Person may become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such Losses (or actions or proceedings, whether commenced or threatened, in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material
fact (in the case of any prospectus or any Written Testing-the-Waters Communication, in the light of the circumstances under which such statement is made) contained in
any Written Testing-the-Waters Communication, a Registration Statement, any preliminary prospectus or prospectus supplement, free writing prospectus or final prospectus
or prospectus supplement contained therein, or any amendment or supplement thereof, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements
therein (in the case of a prospectus or any Written Testing-the-Waters Communication, in the light of the 

  
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circumstances under which they were made) not misleading, and will reimburse each such Selling Holder, its directors, officers, employees and agents, and each such controlling Person for any
legal or other expenses reasonably incurred by them in connection with investigating or defending any such Loss or actions or proceedings as such expenses are incurred; provided, however, that the Partnership will not be liable in any such
case if and to the extent that any such Loss arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission so made in conformity with information furnished by such Selling Holder, its directors,
officers, employees and agents or such controlling Person in writing specifically for use in any Written Testing-the-Waters Communication, a Registration Statement, or
prospectus or any amendment or supplement thereto, as applicable. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of such Selling Holder or any such directors, officers, employees agents or
controlling Person, and shall survive the transfer of such securities by such Selling Holder. 
 (b) By Each Selling Holder.
Each Selling Holder agrees severally and not jointly to indemnify and hold harmless the Partnership, its directors, officers, employees and agents and each Person, if any, who controls the Partnership within the meaning of the Securities Act or of
the Exchange Act, and its directors, officers, employees and agents, to the same extent as the foregoing indemnity from the Partnership to the Selling Holders, but only with respect to information regarding such Selling Holder furnished in writing
by or on behalf of such Selling Holder expressly for inclusion in any Written Testing-the-Waters Communication, a Registration Statement, any preliminary prospectus or
prospectus supplement, free writing prospectus or final prospectus or prospectus supplement contained therein, or any amendment or supplement thereof; provided, however, that the liability of each Selling Holder shall not be greater in amount
than the dollar amount of the proceeds (net of any Selling Expenses) received by such Selling Holder from the sale of the Registrable Securities giving rise to such indemnification. 

(c) Notice. Promptly after receipt by an indemnified party hereunder of notice of the commencement of any action, such indemnified
party shall, if a claim in respect thereof is to be made against the indemnifying party hereunder, notify the indemnifying party in writing thereof, but the omission so to notify the indemnifying party shall not relieve the indemnifying party from
any liability that it may have to any indemnified party other than under this Section 2.08. In any action brought against any indemnified party, the indemnified party shall notify the indemnifying party of the commencement thereof. The
indemnifying party shall be entitled to participate in and, to the extent it shall wish, to assume and undertake the defense thereof with counsel reasonably satisfactory to such indemnified party and, after notice from the indemnifying party to such
indemnified party of its election so to assume and undertake the defense thereof, the indemnifying party shall not be liable to such indemnified party under this Section 2.08 for any legal expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable costs of investigation and of liaison with counsel so selected; provided, however, that, (i) if the indemnifying party has failed to assume the defense or
employ counsel reasonably acceptable to the indemnified party or (ii) if the defendants in any such action include both the indemnified party and the indemnifying party and counsel to the indemnified party shall have concluded that there may be
reasonable defenses available to the indemnified party that are different from or additional to those available to the indemnifying party, or if the interests of the indemnified party reasonably may be deemed to

  
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conflict with the interests of the indemnifying party, then the indemnified party shall have the right to select a separate counsel and to assume such legal defense and otherwise to participate
in the defense of such action, with the reasonable expenses and fees of such separate counsel and other reasonable expenses related to such participation to be reimbursed by the indemnifying party as incurred. Notwithstanding any other provision of
this Agreement, no indemnified party shall settle any action brought against it with respect to which it is entitled to indemnification hereunder without the consent of the indemnifying party, unless the settlement thereof imposes no liability or
obligation on, and includes a complete and unconditional release from all liability of, the indemnifying party. 

(d) Contribution. If the indemnification provided for in this Section 2.08 is held by a court or government agency of
competent jurisdiction to be unavailable to any indemnified party or is insufficient to hold them harmless in respect of any Losses, then each indemnifying party, in lieu of indemnifying such indemnified party, shall contribute to the amount paid or
payable by such indemnified party as a result of such Loss in such proportion as is appropriate to reflect the relative fault of the indemnifying party on the one hand and of such indemnified party on the other in connection with the statements or
omissions that resulted in such Losses, as well as any other relevant equitable considerations; provided, however, that in no event shall the Selling Holder be required to contribute an aggregate amount in excess of the dollar amount of
proceeds (net of Selling Expenses) received by such Selling Holder from the sale of Registrable Securities giving rise to such indemnification. The relative fault of the indemnifying party on the one hand and the indemnified party on the other shall
be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact has been made by, or relates to, information supplied by such party,
and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The parties hereto agree that it would not be just and equitable if contributions pursuant to this paragraph
were to be determined by pro rata allocation or by any other method of allocation that does not take account of the equitable considerations referred to herein. The amount paid by an indemnified party as a result of the Losses referred to in the
first sentence of this paragraph shall be deemed to include any legal and other expenses reasonably incurred by such indemnified party in connection with investigating or defending any Loss that is the subject of this paragraph. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any Person who is not guilty of fraudulent misrepresentation. 

(e) Other Indemnification. The provisions of this Section 2.08 shall be in addition to any other rights to
indemnification or contribution that an indemnified party may have pursuant to law, equity, contract or otherwise. 
 Section
2.09. Rule 144 Reporting. With a view to making available the benefits of certain rules and regulations of the Commission that may permit the sale of the Registrable Securities to the public without registration, the Partnership agrees
to use its commercially reasonable efforts to: 
 (a) make and keep public information regarding the Partnership available, as those
terms are understood and defined in Rule 144 under the Securities Act, at all times from and after the date hereof; 

  
 11 

 (b) file with the Commission in a timely manner all reports and other documents required of
the Partnership under the Exchange Act at all times from and after the date hereof; and 
 (c) so long as a Holder owns any Registrable
Securities, unless otherwise available via EDGAR, furnish to such Holder forthwith upon request a copy of the most recent annual or quarterly report of the Partnership, and such other reports and documents so filed as such Holder may reasonably
request in availing itself of any rule or regulation of the Commission allowing such Holder to sell any such securities without registration. 

Section 2.10. Transfer or Assignment of Registration Rights. The rights to cause the Partnership to register Registrable
Securities granted to a Holder by the Partnership under this Article II may be transferred or assigned by such Holder to one or more transferee(s) or assignee(s) of such Registrable Securities; provided, however, that (a) unless
such transferee or assignee is an Affiliate of MLP Holdco, each such transferee or assignee holds Registrable Securities representing at least five percent (5%) of the then-outstanding Registrable Securities (subject to adjustment pursuant to
Section 3.04), (b) the Partnership is given written notice prior to any said transfer or assignment, stating the name and address of each such transferee and identifying the Registrable Securities with respect to which such registration
rights are being transferred or assigned, and (c) each such transferee agrees to be bound by this Agreement. 
 Section
2.11. Restrictions on Public Sale by Holders of Registrable Securities. MLP Holdco and any other Holder(s) who, along with its Affiliates, holds at least five percent (5%) of the then-outstanding Registrable Securities (subject to
adjustment pursuant to Section 3.04), agrees to enter into a customary letter agreement with underwriters providing such Holder will not effect any public sale or distribution of the Registrable Securities during the 90 calendar day
period beginning on the date of a prospectus or prospectus supplement filed with the Commission with respect to the pricing of an Underwritten Offering, provided that (i) the duration of the foregoing restrictions shall be no longer than the
duration of the shortest restriction generally imposed by the underwriters on the Partnership or the officers, directors or any other unitholder of the Partnership on whom a restriction is imposed and (ii) the restrictions set forth in this
Section 2.11 shall not apply to any Registrable Securities that are included in such Underwritten Offering by such Holder. 

ARTICLE III 

MISCELLANEOUS 
 Section
3.01. Communications. All notices and other communications provided for or permitted hereunder shall be made in writing by facsimile, courier service or personal delivery: 

(a) if to MLP Holdco: 
 OMS
Holdings LLC 
 1001 Fannin Street, Suite 1500 

Houston, Texas 77002 
 Attention:
General Counsel 
 Facsimile: (281) 404-9501 

  
 12 

 (b) if to a transferee of MLP Holdco, to such Holder at the address provided pursuant to
Section 2.10; and 
 (c) if to the Partnership: 

Oasis Midstream Partners LP 
 c/o
OMP GP LLC 
 1001 Fannin Street, Suite 1500 

Houston, Texas 77002 
 Attention:
General Counsel 
 Facsimile: (281) 404-9501 

All such notices and communications shall be deemed to have been received at the time delivered by hand, if personally delivered; when receipt
acknowledged, if sent via facsimile or sent via electronic mail; and when actually received, if sent by courier service or any other means. 

Section 3.02. Successor and Assigns. This Agreement shall inure to the benefit of and be binding upon the successors and assigns
of each of the parties, including subsequent Holders of Registrable Securities to the extent permitted herein. 
 Section
3.03. Assignment of Rights. All or any portion of the rights and obligations of the Holders under this Agreement may be transferred or assigned by the Holders in accordance with Section 2.10 hereof. 

Section 3.04. Recapitalization, Exchanges, Etc. Affecting the Registrable Securities. The provisions of this Agreement shall apply
to the full extent set forth herein with respect to any and all securities of the Partnership or any successor or assign of the Partnership (whether by merger, consolidation, sale of assets or otherwise) that may be issued in respect of, in exchange
for or in substitution of, the Registrable Securities, and shall be appropriately adjusted for combinations, splits, recapitalizations, pro rata distributions and the like occurring after the date of this Agreement. 

Section 3.05. Specific Performance. Damages in the event of breach of this Agreement by a party hereto may be difficult, if not
impossible, to ascertain, and it is therefore agreed that each party, in addition to and without limiting any other remedy or right it may have, will have the right to an injunction or other equitable relief in any court of competent jurisdiction,
enjoining any such breach, and enforcing specifically the terms and provisions hereof, and each of the parties hereto hereby waives any and all defenses it may have on the ground of lack of jurisdiction or competence of the court to grant such an
injunction or other equitable relief. The existence of this right will not preclude any such party from pursuing any other rights and remedies at law or in equity that such party may have. 

Section 3.06. Counterparts. This Agreement may be executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which counterparts, when so executed and delivered, shall be deemed to be an original and all of which counterparts, taken together, shall constitute but one and the same Agreement. 

  
 13 

 Section 3.07. Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof. 
 Section 3.08. Governing Law. The laws of the State
of Delaware shall govern this Agreement. 
 Section 3.09. Severability of Provisions. Any provision of this Agreement that is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof or affecting or impairing the validity or
enforceability of such provision in any other jurisdiction. 
 Section 3.10. Scope of Agreement. The rights granted pursuant to
this Agreement are intended to supplement and not to reduce or replace any rights any Holders may have under the Partnership Agreement with respect to the Registrable Securities. This Agreement is intended by the parties as a final expression of
their agreement and intended to be a complete and exclusive statement of the agreement and understanding of the parties hereto in respect of the subject matter contained herein. Except as provided in the Partnership Agreement, there are no
restrictions, promises, warranties or undertakings, other than those set forth or referred to herein with respect to the rights granted by the Partnership set forth herein. Except as provided in the Partnership Agreement, this Agreement supersedes
all prior agreements and understandings between the parties with respect to such subject matter. 
 Section 3.11. Amendment.
This Agreement may be amended only by means of a written amendment signed by the Partnership and the Holders of a majority of the then outstanding Registrable Securities; provided, however, that no such amendment shall materially and
adversely affect the rights of any Holder hereunder without the consent of such Holder. 
 Section 3.12. No Presumption. If any
claim is made by a party relating to any conflict, omission or ambiguity in this Agreement, no presumption or burden of proof or persuasion shall be implied by virtue of the fact that this Agreement was prepared by or at the request of a particular
party or its counsel. 
 Section 3.13. Aggregation of Registrable Securities. All Registrable Securities held or acquired by
Persons who are Affiliates of one another shall be aggregated together for the purpose of determining the availability of any rights under this Agreement. 

Section 3.14. Obligations Limited to Parties to Agreement. Each of the parties hereto covenants, agrees and acknowledges that no
Person other than the Partnership and the Holders shall have any obligation hereunder and that, notwithstanding that one or more of the Holders may be a corporation, partnership or limited liability company, no recourse under this Agreement or under
any documents or instruments delivered in connection herewith or therewith shall be had against any former, current or future director, officer, employee, agent, general or limited partner, manager, member, stockholder or Affiliate of any of the
Holders or any former, current 

  
 14 

 
or future director, officer, employee, agent, general or limited partner, manager, member, stockholder or Affiliate of any of the foregoing, whether by the enforcement of any assessment or by any
legal or equitable proceeding, or by virtue of any applicable law, it being expressly agreed and acknowledged that no personal liability whatsoever shall attach to, be imposed on or otherwise be incurred by any former, current or future director,
officer, employee, agent, general or limited partner, manager, member, stockholder or Affiliate of any of the Holders or any former, current or future director, officer, employee, agent, general or limited partner, manager, member, stockholder or
Affiliate of any of the foregoing, as such, for any obligations of the Holders under this Agreement or any documents or instruments delivered in connection herewith or therewith or for any claim based on, in respect of or by reason of such
obligation or its creation, except in each case for any assignee of the Holders hereunder. 
 Section 3.15. Interpretation. All
references to “Articles” and “Sections” shall be deemed to be references to Articles and Sections of this Agreement, unless otherwise specified. All references to instruments, documents, contracts and agreements are references to
such instruments, documents, contracts and agreements as the same may be amended, supplemented and otherwise modified from time to time, unless otherwise specified. The word “including” shall mean “including but not limited to.”
Whenever any determination, consent or approval is to be made or given by the Holders under this Agreement, such action shall be in the Holders’ sole discretion unless otherwise specified. 

[Signature page follows] 

  
 15 

 IN WITNESS WHEREOF, the parties hereto execute this Agreement, effective as of the date first
above written. 
  

			
	OMS HOLDINGS LLC
		
	By:	 	  

		 	Name:
		 	Title:
	
	OASIS MIDSTREAM PARTNERS LP
		
	By:	 	OMP GP LLC, its general partner
		
	By:	 	  

		 	Name:
		 	Title:

 SIGNATURE PAGE 

TO 

REGISTRATION RIGHTS AGREEMENTEX-10.12

 Exhibit 10.12 

SERVICES AND SECONDMENT AGREEMENT 

This Services and Secondment Agreement (this “Agreement”), effective as
of                 , 2017 (the “Effective Date”), is entered into by and between Oasis Petroleum Inc., a Delaware corporation
(“Oasis”) and Oasis Midstream Partners LP, a Delaware limited partnership (the “MLP”). Each of the foregoing is referred to herein as a “Party” and collectively as the
“Parties.” 
 RECITALS: 

WHEREAS, the MLP Group will own, as of the Effective Date, the Facilities (defined below) consisting of, among other things, gathering
pipelines, processing facilities and disposal systems; 
 WHEREAS, the Parties desire to enter into an agreement whereby Oasis provides to
the MLP Group the G&A Services (as defined below) to provide general and administrative support in the running of the MLP Group’s business and to otherwise fulfill its intended business purpose; 

WHEREAS, the Parties also desire to enter into an agreement whereby Oasis provides to the MLP Group (in addition to, and separate from, the
G&A Services) employee services necessary to operate, construct, manage and maintain the MLP’s assets as of the Effective Date, including (i) gathering pipelines, processing facilities, disposal systems, related equipment and assets,
(ii) any accessions or improvements thereto or (iii) any assets acquired or constructed in accordance with the provisions of the Omnibus Agreement (collectively, the “Facilities”), (such employee services, the
“MLP Employee Services”), and thus seconds to the MLP certain personnel employed by Oasis to provide the MLP Group with MLP Employee Services in accordance with the terms of this Agreement; and 

WHEREAS, the Parties desire that the services provided pursuant to this Agreement be provided to the MLP Group from and after the Effective
Date. 
 NOW THEREFORE, in consideration of the promises and the mutual covenants and agreements contained herein, and other good and
valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows, effective as of the Effective Date: 

Section 1. General and Administrative Services. 

(a) During the Term (as defined below), Oasis hereby agrees to cause the Oasis Entities to provide the MLP Group with certain general and
administrative services as set forth on Schedule I hereto and such other general or administrative services as the MLP and Oasis may mutually agree upon from time to time (collectively, the “G&A Services”). Oasis
shall, and shall cause the Oasis Entities to, provide the MLP Group with such G&A Services in a manner consistent in nature and quality to the services of such type previously provided by the Oasis Entities in connection with their management of
the MLP Assets prior to their acquisition by the MLP Group. 

 Section 2. G&A Services Expense Reimbursement; Procedures. 

(a) Subject to and in accordance with the terms and provisions of this Section 2 and such reasonable allocation and other procedures as
may be agreed upon by Oasis and the General Partner from time to time, the MLP hereby agrees to reimburse Oasis for all direct and indirect costs and expenses incurred by the Oasis Entities in connection with the provision of the G&A Services to
the MLP Group, including the following: 
 (i) any payments or expenses incurred for insurance coverage, including allocable portions of
premiums, and negotiated instruments (including surety bonds and performance bonds) provided by underwriters with respect to the MLP Assets or the business of the MLP Group; 

(ii) the costs associated with salaries, bonuses, other compensation and employment benefits and expenses of personnel employed by the Oasis
Entities who render G&A Services to the MLP Group, plus general and administrative expenses associated with such personnel; provided, however that any expenses paid or reimbursed by the MLP Group with respect to a plan that is self-insured by
any of the Oasis Entities will reflect actual costs incurred rather than premiums paid; and 
 (iii) all expenses and expenditures incurred
by the Oasis Entities as a result of the MLP becoming and continuing as a publicly traded entity, including costs associated with annual, quarterly and current reporting, tax return and Schedule K-1
preparation and distribution, independent auditor fees, partnership governance and compliance, registrar and transfer agent fees and director compensation; 

it being agreed, however, that to the extent any reimbursable costs or expenses incurred by the Oasis Entities consist of an allocated portion of costs and
expenses incurred by the Oasis Entities for the benefit of both the MLP Group and the other Oasis Entities, such allocation shall be made on a reasonable cost reimbursement basis as determined by Oasis. 

(b) The MLP Group will reimburse the Oasis Entities monthly for all cash expenditures that the Oasis Entities incur or payments the Oasis
Entities make on behalf of the MLP Group in connection with providing the G&A Services, as well as for certain other direct or allocated costs and expenses incurred by the Oasis Entities on behalf of the MLP Group. Billings and payments may be
accomplished by inter-company accounting procedures and transfers. The MLP shall have the right to review all source documentation concerning the liabilities, costs and expenses upon reasonable notice and during regular business hours. 

Section 3. Secondment of Seconded Employees. 

(a) During the Term, Oasis shall provide to the MLP the Seconded Employees (as defined below) to provide the MLP Employee Services to the MLP
Group. Subject to Oasis’s right to be reimbursed for costs and expenses in accordance with Section 5, Oasis shall be solely responsible for all costs and expenses required in connection with the employment of the Seconded Employees,
including salaries, wages, other cash compensation, employee benefits (including health and welfare benefits and retirement benefits) and overhead and administrative expenses, the reporting and payment of social security and other payroll taxes,
workers’ 

  
 -2- 

 
compensation insurance premiums and all other applicable costs and expenses. Any Seconded Employees retained by Oasis may be union or non-union employees,
and Oasis shall have the sole right to negotiate the terms and provisions of any labor or other agreements with the unions to which such employees belong. 

(b) During the Term (and for as long as each applicable Seconded Employee remains employed by Oasis), Oasis shall, pursuant to the terms of
this Agreement, second certain employees of Oasis to the MLP to provide the MLP Employee Services to the MLP Group. Each such employee who Oasis seconds to the MLP shall, during the time that such individual is seconded to the MLP under this
Agreement (the “Period of Secondment”), be referred to individually herein as a “Seconded Employee” and, collectively, as the “Seconded Employees.” Prior to the commencement of
a Seconded Employee’s Period of Secondment, Oasis shall provide the Seconded Employee with written notice of his or her secondment in the form attached hereto at Schedule II. 

(c) The Seconded Employees will remain at all times employees of Oasis, but, in addition, during their respective Periods of Secondment they
will also be joint employees of the MLP and deemed to have been jointly hired by Oasis and the MLP for these purposes. For the avoidance of doubt, the Parties acknowledge that the Seconded Employees may, during their respective Periods of
Secondment, be called upon to perform services for both the MLP and Oasis. Oasis retains the right to terminate the secondment of any Seconded Employee for any reason at any time or to hire or discharge the Seconded Employees with respect to their
employment with Oasis. The MLP will have the right to terminate the secondment to it of any Seconded Employee for any reason at any time, upon prior written notice to Oasis, but at no time will the MLP have the right to terminate any Seconded
Employee’s employment by Oasis. Upon the termination of the secondment of any Seconded Employee (whether as a result of termination of the secondment of such Seconded Employee by either Party or the termination of the Seconded Employee’s
employment for any reason), such Seconded Employee will cease performing services for the MLP and will cease to be a Seconded Employee for the purposes of this Agreement. 

(d) In the course and scope of performing any Seconded Employee’s job functions for the MLP, the Seconded Employee will report into the
MLP’s management structure, and will be under the direct management and supervision of the MLP with respect to such Seconded Employee’s day-to-day activities
and with respect to the performance of the MLP Employee Services. 
 (e) Those Seconded Employees who serve as supervisors or managers and
who are called upon to oversee the work of other Seconded Employees providing MLP Employee Services at the Facilities or to otherwise provide management support on behalf of the MLP will be designated by the MLP as supervisors to act on the behalf
of the MLP in supervising the Seconded Employees pursuant to Section 3(d) above. Any such Seconded Employee will be acting on the behalf of the MLP when supervising the work of the Seconded Employees or when they are otherwise providing management
or executive support on behalf of the MLP. 
 (f) The Parties expressly recognize that both Oasis and the MLP are the statutory employers of
the Seconded Employees during their respective Periods of Secondment for 

  
 -3- 

 
workers’ compensation purposes; provided, however, that the MLP shall have primary authority, direction and control over the Seconded Employees in the performance of the MLP
Employee Services. At all times during the term of this Agreement, Oasis will maintain workers’ compensation and employer’s liability insurance (either through an insurance company or qualified self-insured program) which shall include and
afford coverage to the Seconded Employees during their respective Periods of Secondment. Oasis will name the MLP as a named insured or alternate employer, as applicable, under such insurance policies or qualified self-insured programs, and Oasis and
the MLP shall be under the same account for the payment of workers’ compensation premiums. Subject to Section 5(b)(ix), the MLP shall reimburse Oasis for 50% of the amount of the workers’ compensation and employer’s liability
insurance premiums relating to the Seconded Employees with respect to their Periods of Secondment and Oasis will pay from its own funds the balance of the amount due of such insurance premiums. For the purposes of workers’ compensation and
employer’s liability laws and coverage, Oasis and the MLP will be joint employers of the Seconded Employees during their respective Periods of Secondment. 

(g) The MLP shall not be a participating employer in any benefit plan of Oasis or any of the other Oasis Entities and any participation by
Seconded Employees in any benefit plans of Oasis shall be in respect of their employment by Oasis. Oasis shall remain solely responsible for all obligations and liabilities arising with respect to any benefit plans relating to any Seconded Employees
and the MLP shall not assume any benefit plan or have any obligations or liabilities arising thereunder, in each case except for costs properly chargeable to the MLP under the terms of this Agreement. 

Section 4. The MLP Employee Services. The MLP may terminate any of the MLP Employee Services on thirty
(30) days’ prior written notice to Oasis. In the event the MLP terminates the MLP Employee Services, the MLP shall pay Oasis the Employee Services Reimbursement (as defined below) for the last month (or portion thereof) in which it
received such terminated services. Upon payment thereof, the MLP shall have no further services payment obligations to Oasis related to any MLP Employee Services pursuant to this Agreement with respect to such terminated services. 

Section 5. Secondment Expense Reimbursement. 

(a) The MLP shall reimburse Oasis (in a form mutually agreed upon by the MLP and Oasis) for all reimbursable expenses under Section 5(b)
incurred by Oasis in connection with the employment of the Seconded Employees (including, where applicable, former Seconded Employees) during their respective Periods of Secondment (the “Employee Services Reimbursement”). The
Employee Services Reimbursement shall be made on a monthly basis or at such other intervals as the Parties may agree from time to time. For the avoidance of doubt, the Employee Services Reimbursement does not include any amounts payable by the MLP
or the General Partner to Oasis with respect to reimbursement for the G&A Services provided by Oasis in accordance with Section 2 of this Agreement. 

  
 -4- 

 (b) The Employee Services Reimbursement for each Seconded Employee during such Seconded
Employee’s Period of Secondment shall include all costs and expenses (including administrative costs) incurred for such period by Oasis for such Seconded Employee (including, where applicable, former Seconded Employee), including the following
costs and expenses set forth below: 
 (i) salary, wages, overtime pay (if applicable) and other cash compensation (including payroll and
withholding taxes associated therewith); 
 (ii) 401(k) plan costs and expenses for employer contributions made by Oasis, and any deferred
compensation plan costs and expenses for employer contributions made by Oasis; 
 (iii) retirement and cash balance plan contributions and
administrative expenses; 
 (iv) equity awards or cash or equity-based incentive awards; 

(v) cash or premiums actually paid, or expenses actually incurred, with respect to vacation, sick leave, short term disability benefits,
personal leave and maternity; 
 (vi) cash or premiums actually paid, or expenses incurred, with respect to medical, dental and prescription
drug coverage; 
 (vii) flexible benefits plan, including medical care and dependent care expense reimbursement programs; 

(viii) cash or premiums actually paid, or expenses incurred, with respect to disability insurance; 

(ix) fifty (50) percent of the cost of workers’ compensation and employer’s liability insurance premiums; 

(x) cash or premiums actually paid, or expenses incurred, with respect to life insurance and accidental death and dismemberment insurance; and

 (xi) contributions and administrative expenses related to retiree welfare benefits. 

Notwithstanding the above, any Seconded Employee Expenses (as defined below) paid or reimbursed by the MLP with respect to a plan that is
self-insured by Oasis will reflect actual costs incurred rather than premiums paid. 
 (c) The costs and expenses described in Section
5(b) are referred to as “Seconded Employee Expenses.” Where it is not reasonably practicable to determine the amount of any such cost or expense, the MLP and Oasis shall mutually agree on the method of determining or
estimating such cost or expense. 
 Section 6. Secondment Payment. The MLP and Oasis acknowledge and agree
that Oasis shall be responsible for paying the Seconded Employee Expenses (or providing the employee 

  
 -5- 

 
benefits with respect thereto, as applicable) to the Seconded Employees, but that the MLP shall be responsible for reimbursing Oasis for the Seconded Employee Expenses to the extent provided
under Section 5(b) of this Agreement, except that, to the extent required by law, the MLP and Oasis agree to establish a consolidated account with the appropriate governmental authority or otherwise make appropriate arrangements for direct
payment of workers’ compensation premiums in those jurisdictions where it is necessary. 
 Section 7. Term. This Agreement shall
remain in force and effect from the Effective Date for a term of fifteen (15) years (the “Term”), unless earlier terminated by either Party on thirty (30) days’ prior written notice to the other Party.  

Section 8. General Provisions. 

(a) This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, except that the Parties recognize
that to the extent that any term of this Agreement must be interpreted in light of the law of the state in which a Seconded Employee is employed, those terms shall be interpreted accordingly. 

(b) Any notice, demand or communication required or permitted under this Agreement shall be in writing and delivered personally, by reputable
courier or by facsimile, and shall be deemed to have been duly given as of the date and time reflected on the delivery receipt, if delivered personally or sent by reputable courier service, or on the automatic facsimile transmission receipt, if sent
by facsimile, addressed as follows: 
 Oasis Petroleum Inc. 

1001 Fannin Street, Suite 1500 

Houston, Texas 77002 
 Attention:
Chief Financial Officer 
 Facsimile: (281) 404-9501 

Oasis Midstream Partners LP 
 c/o
OMP GP LLC 
 1001 Fannin Street, Suite 1500 

Houston, Texas 77002 
 Attention:
General Counsel 
 Facsimile: (281) 404-9501 

A Party may change its address or facsimile number for the purposes of notices hereunder by giving notice to the other Parties specifying such
changed address in the manner specified in this Section 8(b). 
 (c) This Agreement may be amended or modified from time to time only
by the written agreement of Oasis and the MLP. 
 (d) This Agreement may be executed in any number of counterparts with the same effect as
if all signatory Parties had signed the same document. All counterparts shall be construed together and shall constitute one and the same instrument. 

  
 -6- 

 (e) If any provision of this Agreement or the application thereof to any person or circumstance
shall be held invalid or unenforceable to any extent, the remainder of this Agreement and the application of such provision to other persons or circumstances shall not be affected thereby and shall be enforced to the greatest extent permitted by
law. 
 (f) To the extent any Party is prevented by Force Majeure from performing its obligations, in whole or in part, under this
Agreement, and if such Party (the “Affected Party”) gives notice and details of the Force Majeure to the other Party as soon as reasonably practicable, then the Affected Party shall be excused from the performance with
respect to any such obligations (other than the obligation to make payments) for the period of such Force Majeure event. “Force Majeure” means any act of God, fire, flood, storm, explosion, terrorist act, rebellion or
insurrection, loss of electrical power, computer system failures, finding of illegality, strikes and labor disputes or any similar event or circumstance that prevents a Party from performing its obligations under this Agreement, but only if the
event or circumstance: (i) is not within the reasonable control of the Affected Party, (ii) is not the result of the fault or negligence of the Affected Party and (iii) could not, by the exercise of due diligence, have been overcome
or avoided. 
 (g) This Agreement will be binding upon, and will inure to the benefit of, the Parties and their respective successors,
permitted assigns and legal representatives. 
 (h) This Agreement does not form a partnership or joint venture between the Parties. This
Agreement does not make either Party an agent or a legal representative of the other Party. The Parties shall not assume or create any obligation, liability or responsibility, expressed or implied, on behalf of or in the name of the other Party.

 (i) No Party shall have the right to assign its rights or obligations under this Agreement without the prior written consent of the other
Party. The provisions of this Agreement are enforceable solely by the Parties, and no other person (including any Seconded Employee or any employee of Oasis providing G&A Services) shall have the right, separate and apart from the Parties, to
enforce any provision of this Agreement or to compel any Party to comply with the terms of this Agreement. 
 (j) Titles and headings to
Sections hereof are for the purpose of reference only and shall in no way limit, define or otherwise affect the provisions hereof. Any and all Exhibits or Attachments referred to in this Agreement are, by such reference, incorporated herein and made
a part hereof for all purposes. Unless the context requires otherwise, all references herein to an agreement, instrument or other document shall be deemed to refer to such agreement, instrument or other document as amended, supplemented, modified
and restated from time to time to the extent permitted by the provisions thereof. The words “herein”, “hereof”, “hereunder” and other compounds of the word “here” shall refer to the entire Agreement, including
all Schedules attached hereto, and not to any particular provision hereof. Wherever the context so requires, the masculine gender includes the feminine or neuter, and the singular number includes the plural and conversely. The use herein of the word
“including” following any general statement, term or matter shall not be construed to limit such statement, term or matter to the specific items or matters set forth immediately following such word or to similar items or matters, whether
or not non-limiting language (such as “without limitation”, “but not limited to”, or words of similar 

  
 -7- 

 
import) is used with reference thereto, but rather shall be deemed to refer to all other items or matters that could reasonably fall within the broadest possible scope of such general statement,
term or matter. Neither this Agreement nor any uncertainty or ambiguity herein shall be construed or resolved against any party hereto, whether under any rule of construction or otherwise. On the contrary, this Agreement has been reviewed by each of
the parties hereto and shall be construed and interpreted according to the ordinary meaning of the words used so as to fairly accomplish the purposes and intentions of the parties hereto. 

Section 9. Additional Definitions. 

(a) As used in this Agreement, the following terms shall have the respective meanings set forth below. 

“Contribution Agreement” means that certain Contribution Agreement, dated as of the Effective Date, by and among the
General Partner, the MLP, Oasis and certain other Oasis Entities and MLP Group Members, together with the additional conveyance documents and instruments contemplated or referenced thereunder. 

“General Partner” means OMP GP LLC, a Delaware limited liability company and the general partner of the MLP. 

“MLP Assets” means the assets conveyed, contributed or otherwise transferred, directly or indirectly (including
through the transfer of equity interests), or intended to be conveyed, contributed or otherwise transferred, to the MLP Group pursuant to the Contribution Agreement, including gathering pipelines, processing facilities, disposal systems, offices and
related equipment and real estate. 
 “MLP Group” means the MLP and its Subsidiaries treated as a single
consolidated entity. 
 “MLP Group Member” means any member of the MLP Group. 

“Oasis Entities” means Oasis and any Person controlled, directly or indirectly, by Oasis other than the General
Partner or a member of the MLP Group; and an “Oasis Entity” means any of the Oasis Entities. 
 “Omnibus
Agreement” means that certain Omnibus Agreement, dated as of the Effective Date, by and among the General Partner, the MLP, Oasis and certain other Oasis Entities and MLP Group Members. 

“Person” means an individual or a corporation, firm, limited liability company, partnership, joint venture, trust,
unincorporated organization, association, government agency or political subdivision thereof or other entity. 

“Subsidiary” means, with respect to any Person, (a) a corporation of which more than 50% of the voting power of
shares entitled (without regard to the occurrence of any contingency) to vote in the election of directors or other governing body of such corporation is owned, directly or indirectly, at the date of determination, by such Person, by one or more
Subsidiaries of such 

  
 -8- 

 
Person or a combination thereof, (b) a partnership (whether general or limited) in which such Person or a Subsidiary of such Person is, at the date of determination, a general or limited
partner of such partnership, but only if more than 50% of the partnership interests of such partnership (considering all of the partnership interests of the partnership as a single class) is owned, directly or indirectly, at the date of
determination, by such Person, by one or more Subsidiaries of such Person, or a combination thereof, or (c) any other Person (other than a corporation or a partnership) in which such Person, one or more Subsidiaries of such Person, or a
combination thereof, directly or indirectly, at the date of determination, has (i) at least a majority or controlling ownership interest or (ii) the power to elect or direct the election of a majority of the directors or other governing
body of such Person. For the avoidance of doubt, Bighorn DevCo LLC, Bobcat DevCo LLC and Beartooth DevCo LLC shall be deemed Subsidiaries of the MLP. 

[Signature page follows] 

  
 -9- 

 AS WITNESS HEREOF, the Parties have caused this Services and Secondment Agreement to be executed
by their duly authorized representatives on the date herein above mentioned. 
  

			
	OASIS PETROLEUM INC.
		
	By:	 	  

	Name:	 	
	Title:	 	
	
	OASIS MIDSTREAM PARTNERS LP
		
	By:	 	OMP GP LLC, its general partner
		
	By:	 	  

	Name:	 	
	Title:	 	

 Signature Page to Services and Secondment Agreement 

 Schedule I 
  

	1.	Financial and administrative services (including treasury and accounting) 

  

	2.	Information technology services 

  

	3.	Legal services 

  

	4.	Corporate health, safety and environmental services 

  

	5.	Human resources services 

  

	6.	Procurement services 

  

	7.	Corporate engineering services 

  

	8.	Business development services 

  

	9.	Investor relations and public affairs 

  

	10.	Tax matters 

  

	11.	Insurance coverage 

  
 -11- 

 SCHEDULE II 

[On Oasis Petroleum Inc. Letterhead] 

[Employee name] 
 [Address] 

[Date] 
 Re: [Acknowledgement/Notice] Regarding
Secondment Arrangement 
 Dear [Employee name], 

As you likely already know, your employer, Oasis Petroleum Inc. (“Oasis”), has entered into a transaction to transfer
certain of its assets to Oasis Midstream Partners LP (the “MLP”). In addition to providing the MLP with certain services following the closing of that transaction, Oasis will also provide certain of its employees to the MLP
to work on behalf of the MLP. This employment arrangement is called a “secondment.” You are one of the Oasis employees who will be provided to the MLP under the secondment arrangement. The terms of your secondment are described in more
detail below. 
 Your secondment to the MLP will commence on [date]. During such time that you are seconded to the MLP, you will be
an employee of both Oasis and the MLP and you will be subject to the supervision and direction of the MLP in the performance of your services related to the MLP’s assets. If you have management or supervisory authority and exercise that
authority while seconded to the MLP, you will be acting on behalf of the MLP as an MLP manager or supervisor. 
 This secondment arrangement
will not impact your compensation or employment benefits. Your compensation and benefits will be provided exclusively by Oasis and you will not be entitled to receive any additional compensation from the MLP or participate in any of the MLP’s
employee benefit plans. 
 While seconded to the MLP, you will remain on the payroll of Oasis and you will be covered by workers’
compensation insurance maintained by Oasis. For the purposes of workers’ compensation coverage, you will, while seconded to the MLP, be an employee of, and deemed to have been hired by, both the MLP and Oasis. Should you be injured while
working for or on behalf of the MLP or Oasis, you will have an exclusive remedy under Oasis’s workers’ compensation insurance benefits (subject to the applicable insurance policy terms, as amended from time to time) based on the status of
the MLP and Oasis as your joint-employers. 
 Your secondment to the MLP may be terminated at any time and for any reason or no reason at
all. At the end of your secondment to the MLP, you will automatically cease to be jointly employed by the MLP. 

  
 -12- 

 Please be advised that the terms of this letter may not be changed, modified or terminated, nor
may any of its provisions be waived, unless agreed to in writing by duly authorized representatives of both Oasis and the MLP. Unless otherwise provided in a written agreement, the MLP and Oasis are at-will
employers and this acknowledgment does not alter that arrangement. 
 If you have any questions about this secondment arrangement and what
it may mean to you, please contact [insert name and contact details] for additional information. Otherwise, please confirm your receipt, review and understanding of this acknowledgement by signing the bottom portion of this letter and
returning it to [insert name and contact details] by no later than [date]. 
  

	
	Sincerely,
	
	  

	[Insert name and job title]
	Oasis Petroleum Inc.
	
	  

	[Insert name and job title]
	Oasis Midstream Partners LP

  

			
	[Acknowledged and Agreed:

			
		
	By:	 	                                      
                                         
         

			
		
	Print Name:	 	                                      
                                    

			
		
	Date:	 	                                      
                                         
     ]

  
 -13-

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