Low pressure responsive downhole tool with CAM actuated relief valve
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 reliev valve is communicated with the second pressure conducting passage bewteen 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. The pressure relief valve is opened by mechanical action when the power piston starts to move toward its second position.
- Assignee:
- Halliburton Co.
- Patent Number(s):
- US 4557333
- OSTI ID:
- 5756040
- 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
CONTROL
CONTROL EQUIPMENT
DESIGN
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
HYDRAULIC EQUIPMENT
HYDRAULICS
MECHANICS
PISTONS
PRESSURE CONTROL
PRESSURE EFFECTS
PRESSURE GRADIENTS
PRESSURIZING
RELIEF VALVES
RESERVOIR PRESSURE
VALVES
WELL PRESSURE