Incremental U-tube process to retrieve of bottom hole...

Details Incremental U-tube process to retrieve of bottom hole... Incremental U-tube process to retrieve of bottom hole...

2008-05-22

2009-10-20

Bagnell, David J (Department: 3676)

Wells

Processes

Disassembling well part

C166S383000, C166S385000

Reexamination Certificate

active

07604057

ABSTRACT:
A bottom hole assembly is retrieved through a casing string by lightening the density of the drilling fluid in the casing string above the bottom hole assembly to a lesser density than the drilling fluid in the casing string annulus. The bottom hole assembly moves upward in the casing string in response to an upward force created by the different densities of fluid. While moving upward, less dense fluid being displaced by the upward movement of the bottom hole assembly flows from the casing string. When the bottom hole assembly stops moving upward, slips suspended it at that intermediate point in the casing string. The operator now lightens the density of the drilling fluid in the casing string below the bottom hole assembly, again creating an upward force on the bottom hole assembly that causes the bottom hole assembly to move upward in the casing string.

REFERENCES:
patent: 2997119 (1961-08-01), Goodwin
patent: 2007/0051538 (2007-03-01), Angman et al.
patent: 2007/0068677 (2007-03-01), Angman et al.
patent: WO 2007/140612 (2007-12-01), None
Yakov A. Gelfgat, Mikhail Y. Gelfgat and Yuri S. Lopatin, authors “Advanced Drilling Solutions Lessons from the FSU”, vol. II, The Definitive Book on Russian Drilling Technology Table of Contents, 2 pgs.,—pp. 390-394—1 additional pg.
D.J. Bode, R.B. Noffke and H.V. Nickens, authors “Well-Control Methods and Practices in Small-Diameter Wellbores”, JPT Nov. 1991, pp. 1380-1386.

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