发明名称 |
Tubing pressurized firing apparatus for a tubing conveyed perforating gun |
摘要 |
A tubing pressurized firing apparatus is shown for use with a tubing conveyed perforating gun of the type used to perforate a cased well bore. The firing apparatus has a tubular body with an upper end for connection in the well tubing string and with a lower end for connection to a well perforating gun. An inner mandrel is slidably mounted within the tubular body and has a ball seat formed in the interior bore thereof for receiving a ball dropped through the well tubing string. The ball and ball seat together form a pressure tight seal whereby tubing pressure in the well tubing string acts on the inner mandrel to slide the mandrel downwardly within the tubular body. A cocking mechanism located below the inner mandrel within the body includes a lockout member which is initially positioned between a detonating pin and a percussion detonator. The cocking mechanism is actuated by downward sliding movement of the inner mandrel to move the lockout member from between the detonating pin and percussion detonator whereby a subsequent release of tubing pressure and upward sliding movement of the inner mandrel exposes the detonating pin to the percussion detonator to actuate the detonator and fire the perforating gun.
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申请公布号 |
US4554981(A) |
申请公布日期 |
1985.11.26 |
申请号 |
US19850751999 |
申请日期 |
1985.07.05 |
申请人 |
HUGHES TOOL COMPANY |
发明人 |
DAVIES, DAVID L. |
分类号 |
E21B43/116;E21B43/1185;F42D1/04;(IPC1-7):E21B43/11 |
主分类号 |
E21B43/116 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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