FLUID FLOW MONITORING UPON DRILL STRING BOTTOM LAYOUT RAISING DURING OPERATION IN CASING STRING Russian patent published in 2013 - IPC E21B23/08 E21B10/66

Abstract RU 2495993 C2

FIELD: mining.

SUBSTANCE: during operation in casing string, drill string bottom layout is raised by reducing fluid density in casing string above drill string bottom layout, creating upward force applied to drill string bottom layout. When drill string bottom layout is lifted in casing string, fluid is pumped to top end of annular space, and displaced fluid is discharged from top end of casing string. Fluid flow supplied to top end of annular space is monitored and compared to displaced fluid flow discharged from casing string.

EFFECT: enhanced efficiency of drill string bottom layout lifting.

20 cl, 14 dwg

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RU 2 495 993 C2

Authors

Ehriksen Ehrik P.

Moffitt Majkl E.

Uorren Tommi M.

Dates

2013-10-20—Published

2009-05-22—Filed