Downhole tool with gas energized compressible liquid spring
This patent describes an annulus pressure responsive gas energized compressible liquid spring downhole tool apparatus, comprising: a housing; a power piston slidably disposed in the housing; first and second pressure conducting passage means for communicating a well annulus exterior of the housing with first and second sides, respectively, of the power piston; and retarding means, disposed in the second pressure conducting passage means, for delaying communication of a sufficient portion of a relatively rapid change 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 between a first position and a second position relative to the housing. A method of operating a downhole tool is described. The method comprises, providing the tool having: a housing; a power piston slidably disposed in the housing; first and second pressure conducting passage means for communicating a well annulus exterior of the housing with first and second sides, respectively, of the power piston; retarding means, disposed in the second pressure conducting passage means.
- Assignee:
- Halliburton Co., Duncan, OK
- Patent Number(s):
- US 4665991
- OSTI ID:
- 6437780
- 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
COMPRESSIBLE FLOW
CONTROL
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FLUID FLOW
FLUIDS
GAS FLOW
HYDRAULIC FLUIDS
MACHINE PARTS
MEDIUM PRESSURE
NATURAL GAS WELLS
OIL WELLS
PIPES
PISTONS
PRESSURE CONTROL
SPRINGS
WELLS
WORKING FLUIDS