E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/13
E21B 43/1185 (2006.01)
Patent
CA 2001347
ABSTRACT OF THE DISCLOSURE In a preferred embodiment of the invention, a pressure actuated firing assembly for use in connection with a tubing conveyed perforating system is provided. The firing assembly is connected to a cable and lowered into engagement with the tubing conveyed perforating apparatus set within the well. The cable is removed and pressure is applied to the tubing annulus. At a predetermined pressure a shear member breaks, arming the firing assembly. Force is exerted upon an impact firing rod by a spring member causing fluid to move from a reservoir through a flow path traversing a piston attached to the impact firing rod. In one embodiment, the flow path may be restricted to provide a time delay before the impact firing rod is released whereby the force exerted by a spring forces the firing rod into a percussion firing assembly to thereby detonate the percussion firing assembly and the attached perforating apparatus. Alternatively no flow path may be provided to give instantaneous firing. Unloading member in the form of collets on the piston, prevent the spring's stored energy from being applied to the shear member. Additionally, a keeper key is inserted to prevent relative rotation of the shear member and the torsional forces which may accompany such rotation.
Domstead Gary R.
Ricles Thomas D.
Domstead Gary R.
Dresser Industries Inc.
Macrae & Co.
Ricles Thomas D.
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