Minimal resistance scallop for a well perforating device

a perforating device and minimal resistance technology, applied in the direction of fluid removal, drilling machine and method, borehole/well accessories, etc., can solve the problems of significant reduction of the structural strength of the carrier, failure to withstand external pressure exerted on the carrier, etc., to reduce the energy needed to exit, reduce the thickness of the carrier at the location of the scallop, and the effect of sufficient structural strength
US20050139352A1Inactive Publication Date: 2005-06-30MAULDIN SIDNEY WAYNE
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
MAULDIN SIDNEY WAYNE
Publication Date
2005-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention is an improvement in the design of a perforating gun to perforate the casing in oil and gas wells. Perforating guns have a cylindrical body member with explosive charges at specified intervals designed to shoot outwardly through the body member, the well casing, cement sheath, and into the rock formation. There are recessed areas, scallops, on the outer surface of the body member where the perforating jets, formed by the explosive charges, exit the body member. The present invention uses the strength of an arching geometric shape for the recessed area to be able to further reduce the thickness of steel for minimal resistance to the perforating jet. Minimizing the resistance to the perforating jet increases the depth of penetration into the rock formation and increases the hole size.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] Not Applicable STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0002] Not Applicable REFERENCE TO A MICROFICHE APPENDIX

[0003] Not Applicable BACKGROUND OF THE INVENTION

[0004] The invention relates generally to an improvement in the design of an oil and gas well perforating device. The improvement applies to a type of perforating device that is typically lowered into the well through the casing or tubing in the well to a position where the explosive charges are detonated at the desired depth. The improvement is a method of modifying the scallop that is cut on the exterior of the device, at the location of a perforating charge, so as to minimize the resistance to the explosive charge which in turn improves the performance of the perforating charge by increasing its depth of penetration and hole size.

[0005] After an oil or gas well is drilled, steel casing is lowered into the well and cemented to the adjoining rock forma...

Claims

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