Wells – Processes – Placing or shifting well part
Reexamination Certificate
2007-10-30
2007-10-30
Tsay, Frank (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S077520
Reexamination Certificate
active
11402302
ABSTRACT:
An apparatus for, and method of, lowering items from a drilling rig to a well located below it through the use of a landing string comprised of drill pipe having an enlarged diameter section with a shoulder, in combination with upper and lower holders having wedge members with shoulders that engage and support the drill pipe at the shoulder of the enlarged diameter section, the shoulder of the drill pipe and the shoulders of the wedge members being rotatable with respect to each other.
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S.T. Horton, “Drill String and Drill Collars,” Rotary Drilling Series of Instructional Texts, Unit I, Lesson 3, First Edition, 1995 (more than 4 years earlier than effective filing date of captioneid application), pp. 0-105 (entire book) published by Petroleum Extension Service, Division of Continuing Education, The University of Texas at Austin, in cooperation with International Association of Drilling Contractors.
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Adams Burt A.
Henry Norman A.
Allis-Chalmers Energy, Inc.
Garvey, Smith Nehrbass & North, L.L.C.
North Brett A.
Tsay Frank
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