PRESSURE CYCLE OPERATED PERFORATING FIRING HEAD
First Claim
1. A method of actuating a firing head in a subterranean well, the method comprising the steps of:
- reciprocably displacing an actuator piston of the firing head in the well, the displacing step including the piston being alternately pressure balanced and unbalanced; and
igniting a combustible material in response to the piston displacing step.
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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.
41 Citations
25 Claims
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1. A method of actuating a firing head in a subterranean well, the method comprising the steps of:
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reciprocably displacing an actuator piston of the firing head in the well, the displacing step including the piston being alternately pressure balanced and unbalanced; and igniting a combustible material in response to the piston displacing step. - View Dependent Claims (2, 3, 21, 22, 23, 24)
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4-7. -7. (canceled)
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8. A method of generating electricity in a subterranean well, the method comprising the steps of:
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reciprocably displacing a piston in the well, the displacing step including the piston being alternately pressure balanced and unbalanced; and generating electricity in response to the piston displacing step. - View Dependent Claims (10, 11, 12, 13, 25)
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9. (canceled)
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14-20. -20. (canceled)
Specification