Method and apparatus for controlling borehole pressure in perforating wells
A wireline operated well perforating apparatus is described adapted to be positioned below a packer mounted in a wellbore comprising: (a) a running tool adapted to be supported on a wireline; (b) a pressurized surge tank operably connected to the running tool; (c) means for supporting a perforating gun on the surge tank and means for selectively opening communication between the surge tank and the wellbore to reduce pressure in the wellbore adjacent the surge tank; and (d) frangible valve means in the upper end of the surge tank to close communication between pressure from well fluid above the surge tank and pressure in the wellbore below the surge tank. The method of completing a well comprising: setting a packer in the well bore at a desired distance above the zone to be perforated, running a retrievable running tool having a pressurized surge tank and a perforating gun connected thereto and adapted to extend below the packer until the running tool reaches the packer and the perforating gun is below the packer, actuating the perforating gun to perforate the well bore below the packer, disconnecting the running tool from the surge tank and perforating gun, retrieving the retrievable running tool, running a string of tubing and landing the lower end of same in the upper end of the surge tank and rupturing a frangible disk in the upper end of the surge tank to open communication therethrough to receive fluid from below the packer.
- Assignee:
- NOV; NOV-85-020222; EDB-86-162477
- Patent Number(s):
- US 4605074
- OSTI ID:
- 5310434
- Resource Relation:
- Patent File Date: Filed date 15 Oct 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
NATURAL GAS WELLS
PERFORATION
PRESSURE CONTROL
OIL WELLS
CABLES
GUNS
HOISTING
PACKINGS
POSITIONING
PRESSURIZING
TANKS
VALVES
WELL COMPLETION
CONTAINERS
CONTROL
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MATERIALS HANDLING
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing