Halliburton Energy Services, Inc.

Jeffrey Alan Nelson

Darren Ross Barlow

Cam Le

A method comprises providing a gun string assembly within a wellbore and perforating the wellbore using the gun string assembly. The gun string assembly comprises a plurality of perforating guns coupled in series. A first perforating gun of the plurality of perforating guns comprises a first portion of shaped charges, and a second perforating gun of the plurality of perforating guns comprises a second portion of shaped charges operably associated with a secondary pressure generator. The first perforating gun and the second perforating gun are configured in the gun string assembly to provide a pressure transient comprising one or more pressures at a location in the wellbore that meet one or more thresholds.

Perforating gun assembly and method for controlling wellbore pressure regimes during perforating

A method comprises: a. determining a configuration of a gun string, b. determining, by a computer, a pressure transient at a location in a wellbore, c. comparing the one or more pressures with the one or more pressure thresholds at the location, and d. perforating the wellbore with the gun string using the determined configuration of the gun string when the one or more pressures meet the one or more pressure thresholds at the location. The location in the wellbore has one or more pressure thresholds, and the pressure transient comprises one or more pressures.

A downhole tool gun string assembly comprises a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first plurality of perforating charges; a second perforating gun operable to generate a second pressure at a second location in the wellbore, wherein the second pressure is different from the first pressure and the second perforating gun comprises a second plurality of perforating charges, and wherein at least one of the second plurality of perforating charges is operably associated with a secondary pressure generator, where the first perforating gun and the second perforating gun are configured to maintain a pressure at a selected location in the wellbore below a threshold when the first and second perforating guns are activated substantially concurrently.

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Houston, TX, United States of America

Jeffrey Alan Nelson