Monitoring flow rates while retrieving bottom hole assembly...

Details Monitoring flow rates while retrieving bottom hole assembly... Monitoring flow rates while retrieving bottom hole assembly...

2011-02-15

2011-02-15

Neuder, William P (Department: 3676)

Boring or penetrating the earth

Processes

C175S038000, C175S040000, C166S377000

Reexamination Certificate

active

07886847

ABSTRACT:
A bottom hole assembly in a casing-while-drilling operation is retrieved by reducing the density of the fluid in the casing string above the bottom hole assembly, creating an upward force on the bottom hole assembly. As the bottom hole assembly moves upward in the casing string, fluid is pumped into the upper end of the annulus and displaced fluid flows out of the upper end of the casing string. The flow rate of the fluid flowing into the upper end of the annulus and the flow rate of the displaced fluid flowing out of the casing string are monitored and compared.

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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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