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Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells Number:7,165,634 from the United States Patent and Trademark Office (PTO) owispatent

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Title: Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells

Abstract: The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are described that provide for the efficient installation a cemented steel cased well wherein the drill string and the drill bit are cemented into place during one single drilling pass down into the earth. The normal mud passages or watercourses present in the rotary drill bit are used for the second independent purpose of passing cement into the annulus between the casing and the well while cementing the drill string into place during one single pass into the earth. A one-way cement valve is installed near the drill bit of the drill string that allows the cement to set up efficiently under ambiently hydrostatic conditions while the drill string and drill bit are cemented into place during one single drilling pass into the earth.

Patent Number: 7,165,634 Issued on 01/23/2007 to Vail, III

Inventors: Vail, III; William Banning (Bothell, WA)
Assignee: Weatherford/Lamb, Inc. (Houston, TX)
Appl. No.: 10/678,738
Filed: October 2, 2003

Related U.S. Patent Documents
Application NumberFiling DatePatent NumberIssue Date
10162302Jun., 2002
09487197Jan., 20006397946
09295808Apr., 19996263987
08708396Sep., 19965894897
08323152Oct., 19945551521
10162302Jun., 2002
60353457Jan., 2002
60367638Mar., 2002
60384964Jun., 2002
60313654Aug., 2001

Current U.S. Class: 175/318 ; 166/285
Current International Class: E21B 7/20 (20060101); E21B 27/00 (20060101)
Field of Search: 175/107,402,317,318 166/290,285,295

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