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1. (WO1997009510) TUBING ANCHOR AND FORCE GENERATOR COMBINED WICH SUCH AN ANCHOR
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CLAIMS :

1. A tubing anchor comprising a body; a plurality of slips mounted on the body for radial movement into and out of engagement with the tubing; a drive sleeve mounted on the body for axial movement r'elative thereto; means for moving the drive sleeve relative to the body in a first direction; mating cam surfaces on the drive sleeve and slips respectively whereby axial movement of the drive sleeve relative to the body in the first direction causes radially outward movement of the slips by virtue of relative axial movement of the cam surfaces of the drive sleeve and slips respectively; and
interengaging surfaces on the body and the slips
respectively for transferring axial load applied to the body in a second direction, opposite to the first direction, to the slips to force the slips in the second direction thereby increasing the radially outwardly force on the slips produced by the interengagement of the respective cam surfaceε of the slips and the drive sleeve .

2. A tubing anchor according to Claim 1 wherein the interengaging surfaces of the body and the slips are themselves cam surfaces whereby axial load transferred to the slips from the body in the second direction will itself produce a radially outward force on the slips by virtue of the camming action of the interengaging surfaceε .

3. A tubing anchor according to Claim 1 or Claim 2 wherein the means for moving the drive sleeve comprises: a hydraulic piston and cylinder for producing a force on a piston rod which is connected to the piston and is slideably mounted in the body; and means for connecting the drive sleeve to the piston rod.

4. A tubing anchor according to Claim 3 wherein the piston is captive within the cylinder and including:
means for releasably connecting the cylinder to the body whereby, after releaεe of the releasable connection an axial force may be applied to the cylinder in the second direction to apply an axial force to the piston rod in the second direction and thereby exert an axial force on the drive sleeve in the second direction to release the slips .

5. A tubing anchor according to Claim 4 wherein the releasable means compriseε one or more shear elements.

6. A tubing anchor according to any preceding claim in combination with a force generator, the force
generator being connected to the tubing anchor whereby reaction forces generated on the body of the force generator are transferred to the body of the tubing anchor in the second direction.

7. A tubing anchor and force generator assembly according to Claim 6 wherein the force generator
comprises a plurality of piston and cylinder assemblies, the cylinders being connected to the body of the force generator and the pistons being connected to an output member of the force generator.

8. A tubing anchor and force generator assembly according to Claim 7 wherein the piston rod associated with the force generator piε'ton nearest 'to the tubing anchor is of less robust construction than the piston rod associated with the force generator piston furthest from the tubing anchor.

9. A tubing anchor and force generator assembly according to Claim 7 or Claim 8 wherein the cylinder associated with the force generator piston neareεt to the tubing anchor is of more robust construction than the cylinder associated with the force generator piston furthest from the tubing anchor.