Patent · US Active

Monitoring flow rates while retrieving bottom hole assembly during casing while drilling operations

US7886847B2 · kind B2 · utility

1Cited by

3References

18Claims

0Family size

Assignee

TESCOM CORPORATION · US

Inventors

Erik P. Eriksen · Broken Arrow, US
Michael E. Moffitt · Kingwood, US
Tommy M. Warren · Coweta, US

Key dates

Filing date	May 23, 2008
Grant date	Feb 15, 2011
Priority date	—
Expiry date	May 23, 2028

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B21/085
WIPO fieldCivil engineering
WIPO sectorOther fields

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.