Methods and apparatus for selectively controlling fluid communication between a pipe string and a well bore annulus
A method for selectively controlling communication between the fluids in a well bore and the fluids in a pipe string having a reversing valve connected thereto including a housing with upper and lower ports therein, and valve means operatively disposed in the housing for movement in an extended span of travel between upper and lower port-opening positions in response to successive changes in the direction of the pressure differential between the fluids is described comprising the steps of: providing stop means movable into a blocking position to first limit the valve means to movement back and forth in a restricted portion of the span of travel between upper and lower port-closing positions; providing indexing means responsive to a predetermined number of the pressure differential changes for progressively moving the stop means away from the blocking position and thereby freeing the valve means to then move in the extended span of travel; and whenever the valve means move to the one port-opening position again changing the direction of the pressure differential between the fluids for selectively moving the valve means in the opposite direction along the extended span of travel to the other of the port-opening positions while the stop means are out of the blocking position.
- Assignee:
- Schlumberger Technology Corp., Houston, TX
- Patent Number(s):
- US 4718494
- OSTI ID:
- 5340032
- Resource Relation:
- Patent File Date: Filed date 30 Dec 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
DRILL PIPES
FLOW RATE
VALVES
DRILLING FLUIDS
DRILLS
FLUID FLOW
HYDRAULICS
NATURAL GAS WELLS
OIL WELLS
OPERATION
SLEEVES
CONTROL EQUIPMENT
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
FLUIDS
MECHANICS
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing