System and methodology for minimizing perforating gun shock loads
AssigneeSchlumberger Technology Corporation
InventorsCarlos Erik Baumann, David Damm, Jose Escudero, Moises Enrique Smart
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Abstract
A technique facilitates perforating along specific regions of a wellbore without creating detrimental transient pressure changes along a perforating gun string. In non-perforation regions, pressure charges may be used to maintain pressure within the gun string without creating perforations through the surrounding casing and into the surrounding formation. Each pressure charge may comprise a casing with an explosive material disposed in the casing. However, the components and structure of the pressure charge enable detonation and the corresponding increase in pressure within the gun string without creating perforations.
Claims20
A system for perforating, comprising:
- a perforating gun string comprising a plurality of shaped charges oriented to create perforations in a surrounding formation upon detonation, the perforating gun string further comprising a plurality of pressure charges located in a non- perforation section to establish an increased gun pressure upon detonation without creating perforations into the surrounding formation at the non-perforation section.
A method, comprising:
- arranging a plurality of shaped charges along sections of a perforating gun corresponding with perforation zones of a well;
- positioning a plurality of pressure charges along a portion of the perforating gun corresponding with a zone of the well which is not to be perforated;
- deploying the gun string downhole into a wellbore drilled through the perforation zones of the well;
- and
- selectively detonating the plurality of shaped charges and the plurality of pressure charges to maintain a desired pressure along the interior of the perforating gun while limiting the perforating to the perforating zones of the well.
A system, comprising:
- a pressure charge for use in a perforating gun string to maintain pressure in a non-perforation section of the perforating gun string, the pressure charge comprising:
- a casing;
- an explosive material disposed in the casing;
- a liner located along an interior area of the explosive material;
- and
- a component located within the liner to resist formation of a perforating jet by obstructing collapse of the liner.
Dependencies are inferred from the claim text.