Method and apparatus to selectively reduce wellbore pressure during pumping operations
First Claim
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1. A service tool for use in a well, comprising:
- a tubular having a central passageway therethrough;
a crossover through which fluid flowing down the central passageway can exit the central passageway and enter a lower annulus below a packer and fluid flowing up the central passageway can exit the central passageway and enter an upper annulus above the packer;
a valve mounted to the tubular to allow or block fluid flow from the lower annulus into the central passageway through an opening in a wall of the tubular; and
in which the valve is actuated by a responsive member.
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Abstract
The present invention provides for a tool having diverter valves to reduce the pressure in a wellbore caused by frictional resistance to fluid flow as the beta wave of a gravel pack operation makes its way up the wellbore.
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Citations
34 Claims
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1. A service tool for use in a well, comprising:
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a tubular having a central passageway therethrough;
a crossover through which fluid flowing down the central passageway can exit the central passageway and enter a lower annulus below a packer and fluid flowing up the central passageway can exit the central passageway and enter an upper annulus above the packer;
a valve mounted to the tubular to allow or block fluid flow from the lower annulus into the central passageway through an opening in a wall of the tubular; and
in which the valve is actuated by a responsive member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A valve assembly for use in a well, comprising:
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an upper housing having a port therethrough;
a lower housing joined to the upper housing, the lower housing having a responsive member therein;
a piston sealingly and moveably mounted within the upper and lower housings to form a chamber, the piston having a piston head extending into the chamber and sealingly dividing the chamber into an upper chamber and a lower chamber, the responsive member being adjacent to the upper chamber; and
in whichthe piston allows or prevents fluid communication through the port. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A method to reduce wellbore pressure during pumping operations, comprising:
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a) providing a service tool to which diverter valves can be mounted;
b) spacing the diverter valves along the service tool'"'"'s length;
c) setting each diverter valve to actuate independently from the other diverter valves to an open state when the wellbore pressure reaches some predetermined threshold;
d) placing the service tool in the wellbore; and
e) performing pumping operations. - View Dependent Claims (25, 26)
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27. A service tool for use in a well, comprising:
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a tubular having a central passageway therethrough;
a crossover through which fluid flowing down the central passageway can exit the central passageway and enter a lower annulus below a packer and fluid flowing up the central passageway can exit the central passageway and enter an upper annulus above the packer;
a valve mounted to the tubular to allow or block fluid flow from the lower annulus into the central passageway through an opening in a wall of the tubular; and
in which the valve is actuated by a pressure pulse telemetry device. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification