Method and apparatus for re-entering an abandoned well

Details Method and apparatus for re-entering an abandoned well Method and apparatus for re-entering an abandoned well

2007-09-24

2009-10-13

Thompson, Kenneth (Department: 3672)

Wells

Processes

Assembling well part

C166S075130, C137S371000

Reexamination Certificate

active

07600571

ABSTRACT:
A reentry apparatus for installation on an abandoned well with a surface casing and a production casing inside and below the top end of the surface casing. A production plate seals the production casing. The apparatus includes a drill guide tube with a bottom end attachable to the production plate and configured to extend up above the top end of the surface casing. A surface plate seals the top of the surface casing and the tube extends up through the surface plate and is sealed thereto. A vent hole extends through the tube wall between the surface and production plates. A plug blocks the central passage of the tube above the vent hole. The tube is adapted for releasable attachment of a cap and a pressure control apparatus with drilling tool such that the drilling tool can bore through the plug while containing pressurized fluid in the surface casing.

REFERENCES:
patent: 4703813 (1987-11-01), Sieler
patent: 4747453 (1988-05-01), Howard, Sr.
patent: 5010957 (1991-04-01), Kenner
patent: 5107931 (1992-04-01), Valka et al.
patent: 5372198 (1994-12-01), North et al.
patent: 6817417 (2004-11-01), Blair et al.

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