Low pressure responsive downhole tool with differential pressure holding means
An annulus pressure responsive downhole tool includes a housing having a power piston slidably disposed therein. First and second pressure conducting passages communicate a well annulus with first and second sides of the power piston. A retarding device is disposed in the second pressure conducting passage for delaying communication of a sufficient portion of an increase in well annulus pressure to the second side of the power piston for a sufficient time to allow a pressure differential across the power piston to move the power piston from a first position to a second position relative to the housing. A pressure relief valve is communicated with the second pressure conducting passage between the power piston and the retarding device for relieving from the second pressure conducting passage a volume of fluid sufficient to permit the power piston to travel to its second position. A back pressure check valve is also disposed in the second pressure conducting passage to provide a continuing but releasable pressure differential across the power piston to releasably hold the power piston in its second position.
- Assignee:
- Halliburton Company
- Patent Number(s):
- US 4489786
- OSTI ID:
- 5796017
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ANNULAR SPACE
CONFIGURATION
CONTROL
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FLOW REGULATORS
NATURAL GAS WELLS
OIL WELLS
PISTONS
PRESSURE CONTROL
PRESSURE DEPENDENCE
RESERVOIR PRESSURE
SPACE
TOOLS
VALVES
WELL PRESSURE
WELLS