Low pressure responsive downhole tool with floating shoe retarding 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. The retarding device is an annular floating shoe having a large number of O-rings frictionally engaging inner and outer tubular members of said 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 spring biased pin disposed in the housing engages an indentation in an actuating mandrel attached to said power piston to releasably hold the power piston in its second position.
- Assignee:
- Halliburton Company
- Patent Number(s):
- US 4515219
- OSTI ID:
- 6478774
- 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
COMMUNICATIONS
COMPRESSIBLE FLOW
CONTROL EQUIPMENT
DRILL PIPES
DRILLING EQUIPMENT
DRILLS
DUCTS
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
MACHINE PARTS
NATURAL GAS WELLS
OFFSHORE PLATFORMS
OIL WELLS
PIPES
PISTONS
PRESSURE DEPENDENCE
SPRINGS
VALVES
WELLS