Pressure-controlled well tester operated by one or more selected actuating pressures
This patent describes an annulus pressure controlled valve apparatus for use in closing off communication between the well annulus and a test tool chamber containing a compressible fluid medium. It comprises: a tubular housing having a central flow passage, and an annular chamber in the walls thereof adapted to contain a compressible fluid medium; equalizing passage means leading from the chamber to the exterior of the housing to enable the pressure of the medium to be equalized with well annulus pressure as the housing is lowered into a fluid-filled well bore; a tubular valve element forming a portion of the flow passage and being operable to selectively close the equalizing passage; and means mounted in the wall of the housing and responsive to well annulus pressure in excess of hydrostatic pressure outside the housing for admitting well annulus fluids into one of the chambers to thereby cause the tubular valve element to shift to a closed position.
- Assignee:
- Schlumberger Technology Corp., Houston, TX
- Patent Number(s):
- US 4911242; A
- Application Number:
- PPN: US 7-413908A
- OSTI ID:
- 6779331
- Country of Publication:
- United States
- Language:
- English
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