Explosive safe/arm system for oil well perforating guns
AssigneeDresser Industries, Inc.
InventorsSteven D. Sehnert, Gerald B. McClure, William A. McPhee
Life of this patent
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Abstract
An explosive safe/arm system for use in a perforating gun includes a selectively rotatable member mounted intermediate a detonator and a length of detonator cord. The rotatable member includes a transversely oriented bore which is selectively rotatable into and out of axial alignment with the detonator and the detonator cord. Mounted within the bore is an explosive element for transferring an explosive detonation wave from the detonator to the detonator cord when the bore is in axial alignment.
Claims11
A perforating apparatus for use in completing a subsurface well, comprising:
- an elongated tubular housing member;
- an elongated carrier strip retained within said housing member;
- at least one shaped charge unit mounted on said carrier strip, said shaped charge having the axis of perforation directed generally laterally from said carrier strip;
- a length of detonator cord having one end thereof mounted on said carrier strip and a portion thereof proximate the dorsal portion of said shaped charge;
- an electrical blasting ccap mounted on said carrier strip;
- and
- means rotatably mounted on said carrier strip intermediate said blasting cap and said one end of said detonator cord for selectively blocking an explosive detonation wave from said blasting cap to said one end of said detonator cord when rotated to a first position and passing said explosive detonation wave when rotated to a second position.
A perforating apparatus for use in completing a subsurface well, comprising:
- an elongated tubular housing member;
- an elongated carrier strip retained within said housing member;
- at least one shaped charge unit mounted on said carrier strip, said shaped charge having the axis of perforation directed generally laterally from said carrier strip;
- a length of detonator cord having one end thereof mounted on said carrier strip and a portion thereof proximate the dorsal portion of said shaped charge;
- an electrical blasting cap mounted on said carrier strip;
- and
- means rotatably mounted on said carrier strip intermediate said blasting cap and said one end of said detonator cord for selectively blocking an explosive detonation wave from said blasting cap to said one end of said detonator cord,
- said explosive detonation wave blocking means further comprises:
- a body member having a transversely oriented bore therethrough;
- and
- an explosive element retained within said bore.
A perforating apparatus for use in perforating subsurface earth formations, comprising:
- an elongated tubular housing member having an aperture in the side thereof;
- a length of mounting member within said housing member;
- a shaped charge unit extending through said mounting member having the axis of perforation directed laterally from said mounting member;
- a section of detonator cord, said detonator cord having a portion thereof proximate the dorsal portion of said shaped charge and one end thereof mounted to said mounting member;
- an electrical detonator mounted to said mounting member and axially aligned with said one end of said detonator cord;
- and
- a rotatably safe/arm member mounted on said mounting member and generally alligned with said aperture in said tubular housing member;
- said safe/arm member having a transversely oriented bore therethrough, said bore being selectively axially alignable with said detonator and said one end of said detonator cord in an armed position.
Dependencies are inferred from the claim text.