Method and apparatus for firing a perforating gun
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United States of America Patent
Stats
-
Dec 12, 1989
Grant Date -
N/A
app pub date -
Dec 12, 1988
filing date -
Dec 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrically operated firing piston is provided for effecting the firing of a perforating gun in a subterranean well. The electrical firing system is disposed within a hollow housing which is detachably secured to the gun and is subject to the fluid pressures surrounding the perforating gun. The electrical firing system is armed through the application of a fluid pressure to the exterior of the housing which is in excess of the well hydrostatic pressure, thereby preventing premature firing of the perforating gun before insertion at its desired position in the well. The generation of an electrical firing pulse is controlled by a microprocessor which is preset to be responsive only to a selected value of fluid pressure surrounding the control housing. Thus, the pressure surrounding the perforating gun may be reduced to a selected under-balanced condition before the firing of the gun can be effected.
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