Method and apparatus for perforating well bores using differential pressure
This patent describes a method for perforating a well casing in a well bore. It comprises the steps of: running a perforating gun, a firing head, a valve and a packer into the well casing on a production tubing string having a bore therethrough; setting the packer; opening the valve; applying fluid pressure to the lower annulus of the well bore; reducing the fluid pressure in the lower annulus; closing the valve; creating a predetermined pressure differential between the tubing string bore and the lower annulus of the well bore; applying the pressure differential to a movable piston in the firing head to cause the piston to initiate firing of the gun to perforate the well casing; and applying tubing bore pressure to a sliding sleeve to open a production port to provide fluid communication between the lower annulus and the tubing bore. Also described is another method for perforating a well casing in a well bore. It comprises the steps of: running a perforating gun, a firing head, a valve and a packer into the well casing on a production tubing string having a tubing bore therethrough; setting the packer; creating a pressure differential between the tubing string bore and the lower annulus; applying the pressure differential to a movable piston in the firing head, causing the piston to initiate firing of the gun and opening a sleeve-actuating port to provide fluid communication between the tubing bore and a sliding sleeve; and applying tubing bore pressure through the sleeve-actuating port to the sliding sleeve to open a production port to provide fluid communication between the lower annulus and the tubing bore.
- Assignee:
- Halliburton Co., Duncan, OK
- Patent Number(s):
- US 4862964
- Application Number:
- PPN: US 7314329A
- OSTI ID:
- 7273081
- Resource Relation:
- Patent File Date: 21 Feb 1989
- Country of Publication:
- United States
- Language:
- English
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