Downhole tool
First Claim
1. A downhole tool comprising:
- a tubular body for location in a tubular member and defining a body wall, a longitudinal through bore and a flow port through the body wall;
a tubular valve member mounted in the bore and being axially and rotatably moveable relative to the body between a first position in which fluid may flow through the port at a first flowrate and a second position in which the valve member closes the port, the valve member being moveable between the first and second positions by application of differential fluid pressure; and
control means for controlling axial and rotational movement of the valve member between the first and second positions in the form of a connection between the body and the valve member including a cam arrangement having a circumferentially extending cam groove and a cam follower, the arrangement being such that the cam follower will only move in one direction along the groove and the position of the valve member will change in a predetermined sequence.
2 Assignments
0 Petitions
Accused Products
Abstract
A downhole tool comprises a tubular body (12) for location in a tubular member, such as a drill string, and defines a through bore (20) and a number of circumferentially spaced ports (26). A valve member which may be in the form of a piston sleeve (24) is mounted in the bore (20) and is movable relative to the body (12) between a first position in which fluid may flow through the port (26) and a second position in which the valve member (24) closes the port (26), the valve member being movable between the first and second positions by application of differential fluid pressure. Movement of the valve member (24) is provided by a cam arrangement including a circumferentially extending cam groove (56) and a cam follower (57).
138 Citations
18 Claims
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1. A downhole tool comprising:
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a tubular body for location in a tubular member and defining a body wall, a longitudinal through bore and a flow port through the body wall; a tubular valve member mounted in the bore and being axially and rotatably moveable relative to the body between a first position in which fluid may flow through the port at a first flowrate and a second position in which the valve member closes the port, the valve member being moveable between the first and second positions by application of differential fluid pressure; and control means for controlling axial and rotational movement of the valve member between the first and second positions in the form of a connection between the body and the valve member including a cam arrangement having a circumferentially extending cam groove and a cam follower, the arrangement being such that the cam follower will only move in one direction along the groove and the position of the valve member will change in a predetermined sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A downhole tool comprising:
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a tubular body for location in a tubular member and defining a body wall, a longitudinal through bore and a flow port through the body wall; a tubular valve member mounted in the bore and being moveable relative to the body between a first position in which fluid may flow through the port at a first flowrate and a second position in which the valve member closes the port, the valve member being moveable between the first and second positions by application of differential fluid pressure; and control means for controlling movement of the valve member between the first and second positions in the form of a connection between the body and the valve member including a cam arrangement having a circumferentially extending cam groove and a cam follower, the arrangement being such that the cam follower will only move in one direction along the groove and the position of the valve member will change in a predetermined sequence, the body further comprising a valve seat for cooperation with the valve member to prevent flow through the bore when the valve member is in the first position, and to permit flow through the bore when the body is in the second position.
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9. A downhole tool comprising:
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a tubular body for location in a tubular member and a defining a body wall, a longitudinal through bore and flow port through the body wall; a tubular valve member mounted in the bore and being moveable relative to the body between a first position in which fluid may flow through the port at a first flowrate and a second position in which the valve member closes the port, the valve member being moveable between the first and second positions by application of a differential fluid pressure; and control means for controlling movement of the valve member between the first and second positions in the form of a connection between the body and the valve member including a cam arrangement having a circumferentially extending cam groove and a cam follower, the arrangement being such that the cam follower will only move in one direction along the groove and the position of the valve member will change in a predetermined sequence, the body further comprising a valve seat for cooperation with the valve member to prevent flow through the bore when the valve member is in the first position, and to permit flow through the bore when the body is in the second position, and wherein the valve seat is retrievable from the body.
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10. A downhole tool comprising:
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a tubular body for location in a tubular member and defining a body wall and a longitudinal through bore; a tubular member mounted in the bore and being axially and rotatably moveable relative to the body between a first position and a second position, the valve member being moveable between the first and second positions by application of differential fluid pressure across the valve member; a valve seat mounted on the body for cooperation with the valve member to prevent flow through the bore when the valve member is in the first position, and to permit flow through the bore when the body is in the second position; and control means for controlling movement of the valve member between the first and second positions. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A downhole tool comprising:
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a tubular body for location in a tubular member and defining a body wall and a longitudinal through bore; a tubular valve member mounted in the bore and being axially and rotatably moveable relative to the body between a first position and a second position, the valve member being moveable between the first and second positions by application of differential fluid pressure across the valve member; a valve seat mounted on the body for cooperation with the valve member to prevent flow through the bore when the valve member is in the first position, and to permit flow through the bore when the body is in the second position; and control means for controlling movement of the valve member between the first and second positions.
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18. A downhole tool comprising:
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a tubular body for location in a tubular member and defining a body wall and a longitudinal through bore; a tubular valve member mounted in the bore and being axially and rotatably moveable relative to the body between a first and a second position, the valve member being moveable between the first and second positions by application of differential fluid pressure across the valve member; a valve seat mounted on the body for cooperation with the valve member to prevent flow through the bore when the valve member is in the first position, and to permit flow thorough the bore when the body is in the second position; and control means for controlling movement of the valve member between the first and second positions, wherein the valve seat is retrievable from the body.
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Specification