Document:

EXHIBIT 10.1

 

PROMISSORY
NOTE

 

	Not to Exceed $200,000	June 12, 2017

 

FOR
VALUE RECEIVED, the undersigned Sentinel Energy Services Inc., a Cayman Islands exempted company (“Maker” or the “Company”),
whose address is 1000 Louisiana Street, Suite 3850, Houston, TX 77002, hereby unconditionally promises to pay to the order of
Sentinel Management Holdings, LLC, a Delaware limited liability company (“Payee”), at Payee’s office at 1000
Louisiana Street, Suite 3850, Houston, TX 77002 (or such other address specified by Payee to Maker), the sum of TWO HUNDRED THOUSAND
DOLLARS ($200,000) or such lesser amount as shall have been advanced by Payee to Maker and shall remain unpaid under this note
(this “Note”), in legal and lawful money of the United States of America.

 

Payee
may make advances to Maker from time to time under this Note; provided, however, that notwithstanding anything to the contrary
herein, at no time shall the aggregate of all advances and re-advances outstanding under this Note exceed $200,000.

 

This
is a non-interest bearing Note.

 

The
entire unpaid principal balance of this Note shall be due and payable upon the earlier of December 31, 2017 or the consummation
of a public offering of the Company’s securities.

 

If
payment of this Note or any installment of this Note is not made when due, the entire indebtedness hereunder, at the option of
Payee, shall immediately become due and payable, and Payee shall be entitled to pursue any or all remedies to which Payee is entitled
hereunder, or at law or in equity.

 

This
Note may be prepaid, in whole or in part, without penalty. This Note may not be changed, amended or modified except in a writing
expressly intended for such purpose and executed by the party against whom enforcement of the change, amendment or modification
is sought. The loan evidenced by this Note is made solely for business purposes.

 

THIS
NOTE IS BEING EXECUTED AND DELIVERED, AND IS INTENDED TO BE PERFORMED, IN THE STATE OF NEW YORK. EXCEPT TO THE EXTENT THAT THE
LAWS OF THE UNITED STATES MAY APPLY TO THE TERMS HEREOF, THE SUBSTANTIVE LAWS OF THE STATE OF NEW YORK SHALL GOVERN THE VALIDITY,
CONSTRUCTION, ENFORCEMENT AND INTERPRETATION OF THIS NOTE. IN THE EVENT OF A DISPUTE INVOLVING THIS NOTE OR ANY OTHER INSTRUMENTS
EXECUTED IN CONNECTION HEREWITH, THE UNDERSIGNED PARTIES IRREVOCABLY AGREE THAT VENUE FOR SUCH DISPUTE SHALL LIE IN ANY COURT
OF COMPETENT JURISDICTION IN THE STATE OF NEW YORK.

 

Service
of any notice by Maker to Payee or by Payee to Maker, shall be mailed, postage prepaid by certified United States mail, return
receipt requested, at the address for such party set forth in this Note, or at such subsequent address provided to the other party
hereto in the manner set forth in this paragraph for all notices. Any such notice shall be deemed given three (3) days after deposit
thereof in an official depository under the care and custody of the United States Postal Service.

 

Should
the indebtedness represented by this Note or any part thereof be collected at law or in equity or through any bankruptcy, receivership,
probate or other court proceedings or if this Note is placed in the hands of attorneys for collection after default, the undersigned
and all endorsers, guarantors and sureties of this Note jointly and severally agree to pay to the holder of this Note, in addition
to the principal and interest due and payable hereon, reasonable attorneys’ and collection fees.

 

     

     

    

 

The
undersigned and all endorsers, guarantors and sureties of this Note and all other persons liable or to become liable on this Note
severally waive presentment for payment, demand, notice of demand and of dishonor and nonpayment of this Note, notice of intention
to accelerate the maturity of this Note, notice of acceleration, protest and notice of protest, diligence in collecting, and the
bringing of suit against any other party, and agree to all renewals, extensions, modifications, partial payments, releases or
substitutions of security, in whole or in part, with or without notice, before or after maturity.

 

The
undersigned hereby expressly and unconditionally waives, in connection with any suit, action or proceeding brought by the payee
on this Note, any and every right it may have to (i) injunctive relief, (ii) a trial by jury, (iii) interpose any counterclaim
therein and (iv) have the same consolidated with any other or separate suit, action or proceeding. Nothing herein contained shall
prevent or prohibit the undersigned from instituting or maintaining a separate action against payee with respect to any asserted
claim.

 

Any
provision contained in this Note which 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, and any such prohibitions
or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

 

This
Note represents the final agreement between the parties and may not be contradicted by evidence of prior, contemporaneous or subsequent
oral agreements of the parties.

 

[Signature
page follows]

 

    	 	2	 

     

    

 

EXECUTED
AND AGREED as of the date first above written.

 

	 	

SENTINEL
ENERGY SERVICES INC.,

	 	a
    Delaware corporation
	 	 	 
	 	By:	/s/
    Kent Jamison
	 	Name:	Kent Jamison
	 	Title:	Secretary

 

 

[Signature Page to Promissory Note]

 

 

3EXHIBIT
10.2

 

__________,
2017

 

Sentinel
Energy Services Inc.

1000
Louisiana Street, Suite 3850

Houston,
TX 77002

 

Re:
Initial Public Offering

 

Ladies
and Gentlemen:

 

This
letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement
(the “Underwriting Agreement”) entered into by and among Sentinel Energy Services Inc., a Cayman Islands
exempted company (the “Company”), and Citigroup Global Markets Inc. and Goldman Sachs & Co. LLC,
as representatives (the “Representatives”) of the several underwriters (the “Underwriters”),
relating to an underwritten initial public offering (the “Public Offering”), of [_] of the Company’s
units (including up to [_] units which may be purchased to cover over-allotments, if any) (the “Units”),
each comprised of one of the Company’s Class A Ordinary Shares, par value $0.0001 per share (the “Class A Ordinary
Shares”), and one-third of one warrant (each whole warrant, a “Warrant”). Each Warrant
entitles the holder thereof to purchase one of the Class A Ordinary Shares at a price of $11.50 per share, subject to adjustment.
The Units shall be sold in the Public Offering pursuant to the registration statements on Form S-1 No. 333-[_] and 333-[_] and
prospectus (the “Prospectus”) filed by the Company with the Securities and Exchange Commission (the
“Commission”) and the Company shall apply to have the Units listed on the NASDAQ Capital Market. Certain
capitalized terms used herein are defined in paragraph 11 hereof.

 

In
order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the Public Offering
and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Sentinel Management
Holdings, LLC (the “Sponsor”) and each of the undersigned individuals, each of whom is a member of the
Company’s board of directors and/or management team (each an “Insider” and collectively the “Insiders”),
hereby agrees with the Company as follows:

 

1.
The Sponsor and each Insider agrees that if the Company seeks shareholder approval of a proposed Business Combination, then in
connection with such proposed Business Combination, it, he or she shall vote all Founder Shares and any shares acquired by it,
him or her in the Public Offering or the secondary public market in favor of such proposed Business Combination and not redeem
any Ordinary Shares owned by it, him or her in connection with such shareholder approval.

 

2.
The Sponsor and each Insider hereby agrees that in the event that the Company fails to consummate a Business Combination
within 24 months from the closing of the Public Offering, or such later period approved by the Company’s shareholders
in accordance with the Company’s amended and restated memorandum and articles of association, the Sponsor and each
Insider shall take all reasonable steps to cause the Company to (i) cease all operations except for the purpose of winding
up, (ii) as promptly as reasonably possible but not more than 10 business days thereafter, redeem 100% of the Class A
Ordinary Shares sold as part of the Units in the Public Offering (the “Offering Shares”), at a
per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest
earned on the funds held in the Trust Account and not previously released to the Company to pay its franchise and income
taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding Offering
Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to
receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible
following such redemption, subject to the approval of the Company’s remaining shareholders and the Company’s
board of directors, dissolve and liquidate, subject in each case to the Company’s obligations under Cayman Islands law
to provide for claims of creditors and other requirements of applicable law. The Sponsor and the Insiders agree to not
propose any amendment to the Company’s amended and restated memorandum and articles of association that would affect
the substance or timing of the Company’s obligation to redeem 100% of the Offering Shares if the Company does
not complete a Business Combination within 24 months from the closing of the Public Offering, unless the Company provides its
Public Shareholders with the opportunity to redeem their Offering Shares upon approval of any such amendment at a per share
price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account including interest earned on the
funds held in the Trust Account and not previously released to the Company to pay its franchise and income taxes, divided by
the number of then outstanding Offering Shares.

 

     

     

    

 

The
Sponsor and each Insider acknowledges that it, he or she has no right, title, interest or claim of any kind in or to any monies
held in the Trust Account or any other asset of the Company as a result of any liquidation of the Company with respect to the
Founder Shares. The Sponsor and each Insider hereby further waives, with respect to any of the Ordinary Shares held by it, him
or her, any redemption rights it, he or she may have in connection with the consummation of a Business Combination, including,
without limitation, any such rights available in the context of a shareholder vote to approve such Business Combination or in
the context of a tender offer made by the Company to purchase the Ordinary Shares and in connection with a shareholder vote
to amend the Company’s amended and restated memorandum and articles of association in a manner that would affect the substance
or timing of the Company’s obligation to redeem 100% of the Company’s public shares if the Company has not consummated
a Business Combination within 24 months from the closing of the Public Offering (although the Sponsor, the Insiders and their
respective affiliates shall be entitled to redemption and liquidation rights with respect to any of the Ordinary Shares (other
than the Founder Shares) it or they hold if the Company fails to consummate a Business Combination within 24 months from the date
of the closing of the Public Offering).

 

3.
During the period commencing on the effective date of the Underwriting Agreement and ending 180 days after such date, the
undersigned shall not, without the prior written consent of the Representatives, (i) sell, offer to sell, contract or agree
to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of or agree to dispose of, directly or
indirectly, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the
meaning of Section 16 of the Securities Exchange Act of 1934, as amended, and the rules and regulations of the Commission
promulgated thereunder, any Units, Class A Ordinary Shares, the Company’s Class B Ordinary Shares, par value $0.0001
per share (the “Class B Ordinary Shares” and, together with the Class A Ordinary Shares, the
“Ordinary Shares”), Warrants or any securities convertible into, or exercisable, or exchangeable
for, Ordinary Shares owned by him, her or it, (ii) enter into any swap or other arrangement that transfers to another, in
whole or in part, any of the economic consequences of ownership of any Units, Ordinary Shares, Founder Shares, Warrants or
any securities convertible into, or exercisable, or exchangeable for, Class A Ordinary Shares owned by him, her or it,
whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii)
publicly announce any intention to effect any transaction, including the filing of a registration statement, specified
in clause (i) or (ii). If the undersigned is an officer or director of the Company, the undersigned further agrees that the
forgoing restrictions shall be equally applicable to any issuer-directed Units that the undersigned may purchase in the
Public Offering. Each of the Insiders and the Sponsor acknowledges and agrees that, prior to the effective date of any
release or waiver of the restrictions set forth in this paragraph 3 or paragraph 7 below, the Company shall announce the
impending release or waiver by press release through a major news service at least two business days before the effective
date of the release or waiver. Any release or waiver granted shall only be effective two business days after the publication
date of such press release. The provisions of this paragraph will not apply if the release or waiver is effected solely to
permit a transfer not for consideration and the transferee has agreed in writing to be bound by the same terms described in
this Letter Agreement to the extent and for the duration that such terms remain in effect at the time of the transfer.

 

4.
In the event of the liquidation of the Trust Account, the Sponsor (which for purposes of clarification shall not extend to any
officer, member or manager of the Sponsor) agrees to indemnify and hold harmless the Company against any and all loss, liability,
claim, damage and expense whatsoever (including, but not limited to, any and all legal or other expenses reasonably incurred in
investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) to which
the Company may become subject as a result of any claim by (i) any third party (other than the Company’s independent public
accountants) for services rendered or products sold to the Company or (ii) a prospective target business with which the Company
has entered into a letter of intent, confidentiality or other similar agreement or business combination agreement (a “Target”);
provided, however, that such indemnification of the Company by the Sponsor shall apply only to the extent necessary
to ensure that such claims by a third party for services rendered (other than the Company’s independent public accountants)
or products sold to the Company or a Target do not reduce the amount of funds in the Trust Account to below the lesser of (i)
$10.00 per share of the Offering Shares and (ii) the actual amount per share of the Offering Shares held in the Trust Account
due to reductions in the value of the trust assets as of the date of the liquidation of the Trust Account, in each case including
interest earned on the funds held in the Trust Account and not previously released to the Company to pay its franchise and income
taxes, less franchise and income taxes payable, except as to any claims by a third party or Target that executed an agreement
waiving claims against and all rights to seek access to the Trust Account whether or not such agreement is enforceable. In the
event that any such executed waiver is deemed to be unenforceable against such third party, the Sponsor shall not be responsible
for any liability as a result of any such third party claims. Notwithstanding any of the foregoing, such indemnification of the
Company by the Sponsor shall not apply as to any claims under the Company’s obligation to indemnify the Underwriters against
certain liabilities, including liabilities under the Securities Act of 1933, as amended. The Sponsor shall have the right to defend
against any such claim with counsel of its choice reasonably satisfactory to the Company if, within 15 days following written
receipt of notice of the claim to the Sponsor, the Sponsor notifies the Company in writing that it shall undertake such defense.

 

    	 	2	 

     

    

 

5.
To the extent that the Underwriters do not exercise their over-allotment option to purchase an additional [_] Units (as described
in the Prospectus), the Sponsor agrees to forfeit, for cancellation at no cost, a number of Founder Shares equal to [_] multiplied
by a fraction, (i) the numerator of which is [_] minus the number of Units purchased by the Underwriters upon the exercise of
their over-allotment option, and (ii) the denominator of which is [_].  The forfeiture will be adjusted to the extent that
the over-allotment option is not exercised in full by the Underwriters so that the Founder Shares will represent 20.0% of the
Company’s issued and outstanding Ordinary Shares after the Public Offering. The Sponsor further agrees that to the extent
that (a) the size of the Public Offering is increased or decreased and (b) the Sponsor has either purchased or sold Ordinary Shares
or an adjustment to the number of Founder Shares has been effected by way of a share split, share dividend, reverse share split,
contribution back to capital or otherwise, in each case in connection with such increase or decrease in the size of the Public
Offering, then (A) the references to [_] in the numerator and denominator of the formula in the first sentence of this paragraph
shall be changed to a number equal to 15% of the number of the Units issued in the Public Offering and (B) the reference to [_]
in the formula set forth in the first sentence of this paragraph shall be adjusted to such number of Founder Shares that the Sponsor
would have to collectively return to the Company in order for all holders of Founder Shares to hold an aggregate of 20.0% of the
Company’s issued and outstanding Ordinary Shares after the Public Offering.

 

6.
(a) The Sponsor and each Insider hereby agree not to participate in the formation of, or become an officer or director of, any
other blank check company until the Company has entered into a definitive agreement with respect to a Business Combination or
the Company has failed to complete a Business Combination within 24 months after the closing of the Public Offering.

 

(b)
Each of the Sponsor and each Insider hereby agrees and acknowledges that: (i) each of the Underwriters and the Company
would be irreparably injured in the event of a breach by such Sponsor or Insider of his, her or its obligations under
paragraphs 1, 2, 3, 4, 5, 6(a), 7(a) and 7(b) of this Letter Agreement, (ii) monetary damages may not be an adequate remedy for such
breach and (iii) the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such
party may have in law or in equity, in the event of such breach.

 

7.
(a) Subject to certain limited exceptions, the Sponsor and each Insider agrees not to Transfer, assign or sell any Founder Shares
held by it, him or her until one year after the date of the consummation of a Business Combination or earlier if, subsequent to
a Business Combination, (i) the last sale price of the Class A Ordinary Shares equals or exceeds $12.00 per share (as adjusted
for share splits, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading
day period commencing at least 150 days after the consummation of a Business Combination or (ii) the Company consummates a subsequent
liquidation, merger, capital stock exchange or other similar transaction which results in all of the Company’s shareholders
having the right to exchange their Ordinary Shares for cash, securities or other property (the “Lock-up”).

 

(b)
Subject to certain limited exceptions, the Sponsor and each Insider agrees not to Transfer, assign or sell any Private Placement
Warrants or Class A Ordinary Shares underlying such warrants held by it, him or her, until 30 days after the completion of a Business
Combination.

 

(c)
Notwithstanding the provisions set forth in paragraphs 7(a) and (b), Transfers of the Founder Shares, Private Placement
Warrants and Class A Ordinary Shares underlying the Private Placement Warrants or the Founder Shares and that are held by the
Sponsor, any Insider or any of their permitted transferees (that have complied with this paragraph 7(c)) are permitted (a) to
the Company’s officers or directors, any affiliates or family members of any of the Company’s officers or
directors, any members of the Sponsor or their affiliates, or any affiliates of the Sponsor (b) in the case of an individual,
by gift to members of the individual’s immediate family or to a trust, the beneficiary of which is a member of one of
the individual’s immediate family, an affiliate of such person or to a charitable organization; (c) in the case of an
individual, by virtue of laws of descent and distribution upon death of the individual; (d) in the case of an individual,
pursuant to a qualified domestic relations order; (e) by virtue of the laws of the state of Delaware or the Sponsor’s
operating agreement upon dissolution of the Sponsor; (f) by private sales or transfers made in connection with the
consummation of a Business Combination at prices no greater than the price at which the shares were originally purchased; (g)
in the event of the Company’s liquidation prior to the completion of a Business Combination; or (h) in the event of
completion of a liquidation, merger, capital stock exchange or other similar transaction which results in all of the
Company’s shareholders having the right to exchange their Ordinary Shares for cash, securities or other property
subsequent to the completion of a Business Combination; provided, however, that in the case of clauses (a)
through (f), these permitted transferees must enter into a written agreement agreeing to be bound by these transfer
restrictions.

 

    	 	3	 

     

    

 

8.
Each Insider’s biographical information furnished to the Company that is included in the Prospectus is true and
accurate in all respects and does not omit any material information with respect to such Insider’s background. Each
Insider’s questionnaire furnished to the Company including any such information that is included in the Prospectus is
true and accurate in all respects. Each Insider represents and warrants that: such Insider is not subject to or a respondent
in any legal action for, any injunction, cease-and-desist order or order or stipulation to desist or refrain from any act or
practice relating to the offering of securities in any jurisdiction; such Insider has never been convicted of, or pleaded
guilty to, any crime (i) involving fraud, (ii) relating to any financial transaction or handling of funds of another person,
or (iii) pertaining to any dealings in any securities and such Insider is not currently a defendant in any such criminal
proceeding; and neither such Insider nor the Sponsor has never been suspended or expelled from membership in any securities
or commodities exchange or association or had a securities or commodities license or registration denied, suspended or
revoked.

 

9.
Except as disclosed in the Prospectus, neither the Sponsor nor any affiliate of the Sponsor, nor any director or officer of the
Company, shall receive any finder’s fee, reimbursement, consulting fee, monies in respect of any repayment of a loan or
other compensation prior to, or in connection with any services rendered in order to effectuate the consummation of the Company’s
initial Business Combination (regardless of the type of transaction that it is). However, such persons may receive the following
payments, none of which will be made from the proceeds held in the Trust Account prior to the completion of the initial Business
Combination: repayment of a loan of up to $200,000 made to the Company by the Sponsor, pursuant to a Promissory Note dated June
12, 2017; payment of an aggregate of $10,000 per month, to the Sponsor, for office space, utilities, secretarial support and administrative
services, pursuant to an Administrative Services Agreement, dated [_], 2017; reimbursement for any reasonable out-of-pocket expenses
related to identifying, investigating, negotiating and consummating an initial Business Combination; and repayment of loans, if
any, and on such terms as to be determined by the Company from time to time, made by the Sponsor or an affiliate of the Sponsor
or certain of the Company’s officers and directors to finance transaction costs in connection with an intended initial Business
Combination, provided, that, if the Company does not consummate an initial Business Combination, a portion of the working capital
held outside the Trust Account may be used by the Company to repay such loaned amounts so long as no proceeds from the Trust Account
are used for such repayment. Up to $1,500,000 of such loans may be convertible into warrants at a price of $1.50 per warrant at
the option of the lender. Such warrants would be identical to the Private Placement Warrants, including as to exercise price,
exercisability and exercise period.

 

10.
The Sponsor and each Insider has full right and power, without violating any agreement to which it is bound (including,
without limitation, any non-competition or non-solicitation agreement with any employer or former employer), to enter into
this Letter Agreement and, as applicable, to serve as a director on the board of directors of the Company and each Insider
hereby consents to being named in the Prospectus as an officer and/or director of the Company, as applicable.

 

11.
As used herein, (i) “Business Combination” shall mean a merger, capital stock exchange, asset acquisition,
share purchase, reorganization or similar business combination, involving the Company and one or more businesses; (ii) “Founder
Shares” shall mean the Class B Ordinary Shares of the Company held by the Sponsor, the Company’s independent
directors and any other holder prior to the consummation of the Public Offering and our Class A Ordinary Shares issued upon automatic
conversion thereof at the time of the Business Combination; (iii) “Private Placement Warrants ” shall
mean the warrants to purchase [_] Class A Ordinary Shares (or [_] Class A Ordinary Shares if the Underwriters’ over-allotment
option in connection with the Public Offering is exercised in full), that the Sponsor has agreed to purchase for an aggregate
purchase price of approximately $[_] (or approximately $[_] if the Underwriters’ over-allotment option in connection with
the Public Offering is exercised in full), or $1.50 per warrant, in a private placement that shall occur simultaneously with the
consummation of the Public Offering; (iv) “Public Shareholders” shall mean the holders of securities
issued in the Public Offering; (v) “Trust Account” shall mean the trust fund into which a portion of
the net proceeds of the Public Offering shall be deposited; and (vi) “Transfer” shall mean the (a) sale
or assignment of, offer to sell, contract or agreement to sell, hypothecate, pledge, grant of any option to purchase or otherwise
dispose of, or agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation
with respect to or decrease of a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934,
as amended, and the rules and regulations of the Commission promulgated thereunder with respect to, any security, (b) entry into
any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of
any security, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (c) public
announcement of any intention to effect any transaction specified in clause (a) or (b).

 

12.
This Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter
hereof and supersedes all prior understandings, agreements, or representations by or among the parties hereto, written or oral,
to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement
may not be changed, amended, modified or waived (other than to correct a typographical error) as to any particular provision,
except by a written instrument executed by all parties hereto.

 

13.
No party hereto may assign either this Letter Agreement or any of its rights, interests, or obligations hereunder without the
prior written consent of the other parties. Any purported assignment in violation of this paragraph shall be void and ineffectual
and shall not operate to transfer or assign any interest or title to the purported assignee. This Letter Agreement shall be binding
on the Sponsor, each Insider and each of their respective successors, heirs and assigns and permitted transferees.

 

    	 	4	 

     

    

 

14.
This Letter Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without
giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction.
The parties hereto (i) all agree that any action, proceeding, claim or dispute arising out of, or relating in any way to, this
Letter Agreement shall be brought and enforced in the courts of New York City, in the State of New York, and irrevocably submit
to such jurisdiction and venue, which jurisdiction and venue shall be exclusive and (ii) waive any objection to such exclusive
jurisdiction and venue or that such courts represent an inconvenient forum.

 

15.
Any notice, consent or request to be given in connection with any of the terms or provisions of this Letter Agreement shall be
in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested),
by hand delivery or facsimile transmission.

 

16.
This Letter Agreement shall terminate on the earlier of (i) the expiration of the Lock-up or (ii) the liquidation of the Company;
provided, however, that this Letter Agreement shall earlier terminate in the event that the Public Offering is not
consummated and closed by [_], 2017, provided further that paragraph 4 of this Letter Agreement shall survive
such liquidation.

 

[Signature
page follows]

 

    	 	5	 

     

    

 

	 	Sincerely,
	 	 
	 	SENTINEL
    MANAGEMENT HOLDINGS, LLC
	 	 
	 	By:	 
	 	Name:	Krishna
    Shivram
	 	Title:	Chief
    Executive Officer
	 	 
	 	
	 	Krishna
    Shivram
	 	 
	 	 
	 	Andrew
    F. J. Gould
	 	 
	 	 
	 	Charles
    S. Leykum
	 	 
	 	 
	 	Vivek
    Raj
	 	 
	 	 
	 	Gerald
    Cimador
	 	 
	 	 
	 	Kent
    Jamison
	 	 
	 	 
	 	[_]
	 	 
	 	 
	 	[_]

 

	Acknowledged and Agreed:	 
	 	 
	SENTINEL ENERGY SERVICES INC.	 
	 	 
	By:	 	 
	 	Name:	Kent
    Jamison	 
	 	Title:	Secretary	 

 

 

 

[Signature
Page to Letter Agreement]

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