**EXHIBIT 99.4** **LETTER TO REGISTERED HOLDERS    AND DTC PARTICIPANTS** **REGARDING THE OFFER TO    EXCHANGE****$600,000,000 PRINCIPAL AMOUNT    OF****5.95% SENIOR NOTES DUE    2012****AND****$600,000,000 PRINCIPAL AMOUNT    OF****6.35%****SENIOR NOTES DUE 2017****AND****$300,000,000 PRINCIPAL AMOUNT    OF****6.80%****SENIOR NOTES DUE 2037****OF****WEATHERFORD INTERNATIONAL,    INC.**    [          ],    2007     To Registered Holders and The Depository Trust Company    Participants:     We are enclosing herewith the materials listed below relating to    the offer by Weatherford International, Inc. (the    “Company”) to exchange the Company’s new    5.95% Senior Notes due 2012 (the “2012 Exchange    Notes”), 6.35% Senior Notes due 2017 (the    “2017 Exchange Notes”) and 6.80% Senior    Notes due 2037 (the “2037 Exchange Notes,” and    collectively with the 2012 Exchange Notes and the 2017 Exchange    Notes, the “Exchange Notes”), pursuant to an    offering registered under the Securities Act of 1933, as amended    (the “Securities Act”), for like principal    amounts of its issued and outstanding 5.95% Senior Notes    due 2012 (the “2012 Outstanding Notes”),    6.35% Senior Notes due 2017 (the “2017 Outstanding    Notes”) and 6.80% Senior Notes due 2037 (the    “2037 Outstanding Notes,” and collectively with    the 2012 Outstanding Notes and the 2017 Outstanding Notes, the    “Outstanding Notes”), respectively, issued by    the Company on June 18, 2007, which Outstanding Notes have    not been registered under the Securities Act, upon the terms and    subject to the conditions set forth in the Company’s    Prospectus, dated    [          ],    2007, and the related Letter of Transmittal (which together    constitute the “Exchange Offer”).     Enclosed herewith are copies of the following documents:     1. Prospectus dated    [          ],    2007;     2. Letter of Transmittal;     3. Notice of Guaranteed Delivery;     4. Instructions to Registered Holder or DTC Participant    from Beneficial Owner;     5. Letter which may be sent to your clients for whose    account you hold definitive registered notes or book-entry    interests representing Outstanding Notes in your name or in the    name of your nominee, to accompany the instruction form referred    to above, for obtaining such client’s instruction with    regard to the Exchange Offer; and     6. Substitute    Form W-9    and Guidelines for Certification of Taxpayer Identification    Number on Substitute    Form W-9    (included with the Letter of Transmittal). **WE URGE YOU TO CONTACT YOUR    CLIENTS PROMPTLY.****PLEASE NOTE THAT THE    EXCHANGE OFFER WILL EXPIRE AT****5:00 P.M. NEW YORK    CITY TIME, ON    [          ],    2007, UNLESS EXTENDED.**      The Exchange Offer is not conditioned upon any minimum number of    Outstanding Notes being tendered.     To participate in the Exchange Offer, a beneficial holder must    either (i) cause to be delivered to The Bank of New York    (the “Exchange Agent”), at the address set    forth in the Letter of Transmittal, definitive registered notes    representing Outstanding Notes in proper form for transfer    together with a properly executed Letter of Transmittal or    (ii) cause a DTC Participant to tender such holder’s    Outstanding Notes to the Exchange Agent’s account    maintained at The Depository Trust Company    (“DTC”) for

 
    the benefit of the Exchange Agent through DTC’s Automated    Tender Offer Program (“ATOP”), including    transmission of a computer-generated message that acknowledges    and agrees to be bound by the terms of the Letter of    Transmittal. By complying with DTC’s ATOP procedures with    respect to the Exchange Offer, the DTC Participant confirms on    behalf of itself and the beneficial owners of tendered    Outstanding Notes all provisions of the Letter of Transmittal    applicable to it and such beneficial owners as fully as if it    completed, executed and returned the Letter of Transmittal to    the Exchange Agent. You will need to contact those of your    clients for whose account you hold definitive registered notes    or book-entry interests representing Outstanding Notes and seek    their instructions regarding the Exchange Offer.     Pursuant to the Letter of Transmittal, each holder of    Outstanding Notes will represent to the Company and the    Guarantors (as defined in the Prospectus) that: (i) the    Exchange Notes or book-entry interests therein to be acquired by    such holder and any beneficial owner(s) of such Outstanding    Notes or interests therein (“Beneficial    Owner(s)”) in connection with the Exchange Offer are    being acquired by such holder and any Beneficial Owner(s) in the    ordinary course of business of the holder and any Beneficial    Owner(s), (ii) the holder and each Beneficial Owner are not    participating, do not intend to participate, and have no    arrangement or understanding with any person to participate, in    the distribution of the Exchange Notes, (iii) the holder    and each Beneficial Owner acknowledge and agree that any person    who is a broker-dealer registered under the Securities Exchange    Act of 1934, as amended (the “Exchange Act”) or    is participating in the Exchange Offer for the purpose of    distributing the Exchange Notes must comply with the    registration and prospectus delivery requirements of the    Securities Act in connection with a secondary resale transaction    of the Exchange Notes or interests therein acquired by such    person and cannot rely on the position of the staff of the    Securities and Exchange Commission (the    “Commission”) set forth in certain no-action    letters, (iv) the holder and each Beneficial Owner    understand that a secondary resale transaction described in    clause (iii) above and any resales of Exchange Notes or    interests therein obtained by such holder in exchange for    Outstanding Notes or interests therein originally acquired by    such holder directly from the Company should be covered by an    effective registration statement containing the selling security    holder information required by Item 507 or Item 508,    as applicable, of    Regulation S-K    of the Commission and (v) neither the holder nor any    Beneficial Owner(s) is an “affiliate,” as defined in    Rule 405 under the Securities Act, of the Company. Upon a    request by the Company, a holder or beneficial owner will    deliver to the Company a legal opinion confirming its    representation made in clause (v) above. If the tendering    holder of Outstanding Notes is a broker-dealer (whether or not    it is also an “affiliate”) or any Beneficial Owner(s)    that will receive Exchange Notes for its own or their account    pursuant to the Exchange Offer, the tendering holder will    represent on behalf of itself and the Beneficial Owner(s) that    the Outstanding Notes to be exchanged for the Exchange Notes    were acquired as a result of market-making activities or other    trading activities, and acknowledge on its own behalf and on the    behalf of such Beneficial Owner(s) that it or they will deliver    a prospectus meeting the requirements of the Securities Act in    connection with any resale of such Exchange Notes; provided,    however, by so acknowledging and by delivering a prospectus,    such tendering holder will not be deemed to admit that it or any    Beneficial Owner is an “underwriter” within the    meaning of the Securities Act.     The enclosed “Instructions to Registered Holder or DTC    Participant from Beneficial Owner” form contains an    authorization by the beneficial owners of Outstanding Notes for    you to make the foregoing representations. You should forward    this form to your clients and ask them to complete it and return    it to you. You will then need to tender Outstanding Notes on    behalf of those of your clients who ask you to do so.     The Company will not pay any fee or commission to any broker or    dealer or to any other persons (other than the Exchange Agent)    in connection with the solicitation of tenders of Outstanding    Notes pursuant to the Exchange Offer. The Company will pay or    cause to be paid any transfer taxes payable on the transfer of    Outstanding Notes to it, except as otherwise provided in the    section “The Exchange Offer — Fees and    Expenses” of the enclosed Prospectus.     Additional copies of the enclosed materials may be obtained from    the Exchange Agent at its address and telephone number set forth    on the front of the Letter of Transmittal.     Very truly yours,     WEATHERFORD INTERNATIONAL, INC. **NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL    CONSTITUTE YOU THE AGENT OF THE COMPANY OR THE EXCHANGE AGENT OR    AUTHORIZE YOU TO USE ANY DOCUMENT OR MAKE ANY STATEMENT ON THEIR    BEHALF IN CONNECTION WITH THE EXCHANGE OFFER OTHER THAN THE    DOCUMENTS ENCLOSED HEREWITH AND THE STATEMENTS CONTAINED    THEREIN.**