[NATIONAL OILWELL VARCO LOGO] December 8, 2005 OPTION AGREEMENT NATIONAL-OILWELL, L.P. AND UNION DRILLING INC. This option agreement is made and entered into this 8th day of December, 2005 between Union Drilling Inc.

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(UDI) with offices at South Pittsburgh Technology Park, 3117 Washington Pike, Bridgeville, PA. 15017, and National Oilwell L.P (NOV) with offices at 10000 Richmond Ave, Houston, Texas 77042, in consideration of the mutual promises covenants and agreements herein set forth. The parties agree as set forth below: Agreement: The parties agree to include the following terms: 1. Upon execution of the Purchase Sale Agreement, UDI will have the option to purchase three (3) Ideal Rigs per NOV quotation NOI-11283-DWK for a deposit of $1,000,000.00 (one million dollars) which is to be received on or before December 15, 2005. The deposit will be applicable to the three purchase but non-refundable should Union Drilling elect not to proceed on the three rig purchase on or before April 30, 2006. Signtool With Cer File. The three Ideal Rigs will be scheduled for delivery in September, October and November 2006. NATIONAL OILWELL L.P.

UNION DRILLING COMPANY /s/ David Crumpler /s/ J. Michael Poole ---------------------------------- --------------------------------- David Crumpler J. Michael Poole V.P. Sales and Marketing Executive V.P./ Operations [NATIONAL OILWELL VARCO LOGO] PROPOSAL [GRAPHIC OMITTED] [GRAPHIC OMITTED] NATIONAL OILWELL VARCO IDEAL 1500 (DC) RIG PACKAGE PREPARED FOR: UNION DRILLING PROJECT: NONE NOI PROPOSAL REF: NOI-11283-DWK 12/08/05 THIS PROPOSAL IS SUBJECT TO OUR STANDARD AND ANY SPECIAL TERMS AND CONDITIONS OF SALE. [NATIONAL OILWELL VARCO LOGO] PROPOSAL -------------------------------------------------------------------------------- Customer Name: UNION DRILLING Quote No: NOI-11283-DWK Project Name: NONE Date: 12/08/05 Cust Ref No: NONE -------------------------------------------------------------------------------- OUR REFERENCE: NOI-11283-DWK YOUR REFERENCE: NONE UNION DRILLING National Oilwell Varco is pleased to offer our equipment detailed in the following proposal. A minimum 30% non refundable down payment required at time of order, 50% at time of Rig-Up with balance at time of shipment (ex-works). Kenmore Calypso Manual Diagnostic Test here. These prices are valid for 30 days and will remain firm through delivery, subject to receipt of written purchase order.