Pressure cycle operated perforating firing head
First Claim
1. A firing head for detonating explosives in a subterranean well, the firing head comprising:
- an actuator piston separating first and second chambers;
a check valve which permits flow from the first chamber to the second chamber, but prevents flow from the second chamber to the first chamber;
a flow restrictor which restricts flow between the first and second chambers;
a biasing device which biases the piston toward the second chamber; and
a firing pin releasing device which releases a firing pin in response to displacement of the piston.
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Accused Products
Abstract
Pressure cycle operated apparatus and methods. A method of actuating a firing head includes the steps of: reciprocably displacing an actuator piston of the firing head, the displacing step including the piston being alternately pressure balanced and unbalanced; and igniting a combustible material in response to the piston displacing step. A method of generating electricity includes: reciprocably displacing a piston, the displacing step including the piston being alternately pressure balanced and unbalanced; and generating electricity in response to the piston displacing step. A firing head includes an actuator piston separating at least two chambers; a check valve which permits one-way flow between the chambers; a flow restrictor which restricts flow between the chambers; a biasing device which biases the piston toward one of the chambers; and a firing pin releasing device which releases a firing pin in response to displacement of the piston.
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Citations
7 Claims
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1. A firing head for detonating explosives in a subterranean well, the firing head comprising:
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an actuator piston separating first and second chambers; a check valve which permits flow from the first chamber to the second chamber, but prevents flow from the second chamber to the first chamber; a flow restrictor which restricts flow between the first and second chambers; a biasing device which biases the piston toward the second chamber; and a firing pin releasing device which releases a firing pin in response to displacement of the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification