Pressure controlled downhole operations

Details Pressure controlled downhole operations Pressure controlled downhole operations

2004-05-27

2010-02-23

Bomar, Shane (Department: 3676)

Boring or penetrating the earth

Processes

C175S237000, C175S268000, C166S318000

Reexamination Certificate

active

07665545

ABSTRACT:
A method and apparatus for temporarily increasing fluid pressure at a specific location in a work string to perform an operation in an oil or gas well bore. Apparatus is provided which, in a first position provides fluid flow through the work string; in a second position provides the desired increase in fluid pressure to perform the operation in the well bore by dropping a ball (62) into the apparatus; and, by shearing pins (52) to move a sleeve (50) within the apparatus, provides a third position which returns fluid flow through the work string via bypass channels (26) created in the apparatus around the ball. Operation of a pressure activated near bit reamer in conjunction with the apparatus is also described.

REFERENCES:
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patent: 3414069 (1968-12-01), Kammerer, Jr.
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patent: 4520870 (1985-06-01), Pringle
patent: 6253861 (2001-07-01), Carmichael et al.
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patent: 0787888 (1997-08-01), None
patent: 0989284 (2000-03-01), None
patent: 2341405 (2002-09-01), None
patent: WO 02/061236 (2002-08-01), None
Bill King and Robert Clayton, “Near-bit reaming tool allows continuous drilling, under-reaming”, Offshore—00/04/2000 (p. 58).

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