Schlumberger Technology Corporation

Vincent F E Rodet

Steven L Anyan

Stephane J Virally

Matthe Contant

Samuel Tocalino

Olukemi Ibironke Aardalsbakke

Ian S Murley

Pressure control in an isolated lower wellbore annulus, defined by a conduit sealably positioned within an isolated lower wellbore segment, is achieved while gravel packing by sensing the pressure within the isolated lower annulus while gravel packing and admitting fluid from the isolated lower annulus into the conduit at one or more discrete locations along the conduit when the sensed pressure corresponds to one or more threshold pressure conditions. The annulus pressure is sensed while gravel packing using a pressure-sensitive device disposed in the annulus, e.g., positioned by the conduit at a high-pressure location. The pressure-sensitive device actuates one or more valves carried along the conduit to admit fluid from the annulus into the conduit at one or more of the discrete locations, and thereby control the pressure in the isolated lower annulus.

Pressure control apparatus and method

A downhole tool has at least one diverter valve. The diverter valves are used to reduce pressure in a wellbore caused by frictional resistance to fluid flow during a gravel pack operation. The increased pressure tends to be created as the beta wave of a gravel pack operation makes its way up the wellbore.

Method and apparatus to selectively reduce wellbore pressure during pumping operations

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Houston, TX, United States of America

Vincent F E Rodet