Casing bottom hole assembly retrieval process

Details Casing bottom hole assembly retrieval process Casing bottom hole assembly retrieval process

2006-08-02

2009-12-29

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Tool removable or insertable through or around driving or...

C175S023000, C166S377000

Reexamination Certificate

active

07637330

ABSTRACT:
A process for retrieving a bottom hole assembly through a casing string may include: installing a casing string in a borehole, the casing string including a bottom hole assembly releasably engaged thereto and moveable through an inner diameter of the casing string; releasing the bottom hole assembly from engagement with the casing string; reducing hydrostatic pressure in the casing string inner diameter above the bottom hole assembly so that the casing string inner diameter pressure above the bottom hole assembly is lower than a fluid pressure below the bottom hole assembly; permitting reverse circulation down through an annulus between the casing string and the borehole to permit the bottom hole assembly to rise up through the casing string toward the surface; and retrieving the bottom hole assembly from the casing string.

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Advanced Drilling Solutions, Lessons from the FSU, vol. II, authors Yakov A. Gelfgat, Mikhail Y. Gelfgat and Yuri S. Lopatin, cover page, copyright page dated 2003, and pp. 263, 390-393.

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