Well tool anchoring system

Claim 2

A well tool anchoring system comprising: a body member sized for passage through a tubing string; at least two longitudinally spaced apart anchoring means cooperatively coupled to said body member in a manner to allow expansion thereof radially outward from a closed position into an anchoring position; and means for expanding said anchoring means radially outwardly from said body member in two phases, an approach phase and an anchoring phase, said means including remotely controllable reversible drive means, means for coupling said drive means to a longitudinally movable hydraulic piston, said piston having a first hydraulic cross section active during said approach phase and a second hydraulic cross section active during said anchoring phase and means for converting longitudinal motion of said piston into radial motion of said anchoring means.

Claim 3

The apparatus of claim 1 and further including means for pressure balancing the interior portion of said body member with the borehole fluid when said anchoring means are in said closed position and during at least one portion of the radial outward movement of said anchoring means.

Claim 4

The apparatus of claim 1 wherein said means for converting longitudinal motion of said piston into radial motion of said anchoring means includes at least two cooperatively sized bores in said body member for interaction with said first and second hydraulic cross section of said piston to form a first hydraulic pressure chamber during said approach phase having a relatively larger diameter and operating at a relatively lower pressure and a second hydraulic pressure chamber during said anchoring phase having a relatively smaller diameter and operating at a relatively higher pressure and at least one longitudinally movable driven hydraulic piston responsive to the pressure in said first and second hydraulic pressure chambers and coupled to said anchoring means in such a manner that longitudinal motion of said driven piston causes radial motion of said anchoring means.

Claim 5

The apparatus of claim 1 wherein said means for coupling said drive means to said hydraulic piston includes gear box means for reducing the relative speed of said drive means and for amplifying the relative power of said drive means and two-way screw means engageable with a cooperatively threaded nut means integral with said hydraulic piston so that the motion of said piston is reversible in accordance with the reversal of said reversible drive means.

Claim 6

The apparatus of claim 4 wherein said reversible drive means comprises a reversible electric motor.

Claim 7

The apparatus of claim 1 and further including pressure relief valve means calibrated to allow a maximum hydraulic pressure to be reached during said approach phase before opening.

Claim 8

A well tool adapted for suspension in a well bore from a suspension cable and comprising: a body; wall-anchoring means on said body and including first piston means slidably mounted on said body, at least a pair of arms respectively having one end pivotally coupled to said first piston means and another end adapted for movement laterally in relation to a well bore wall upon longitudinal movement of said first piston means in relation to said body; and anchor-actuating means including selectively operable motor means mounted on said body and having a rotatable shaft adapted for rotation upon operation of said motor means, hydraulic means including second piston means including a piston member movably disposed on said body and having a first enlarged portion and a second reduced portion respectively adapted for successive movement into first and second piston chambers upon movement of said second piston means on said body, conduit means fluidly coupling said piston chambers to said first piston means, and means coupling said piston member and said motor shaft and cooperatively arranged for moving said piston member upon rotation of said motor shaft.

Claim 9

A well tool adapted for suspension in a well bore from a suspension cable and comprising: a body; wall-anchoring means on said body and including first piston means slidably mounted on said body, at least a pair of arms respectively having one end pivotally coupled to said first piston means and another end adapted for movement laterally in relation to a well bore wall upon longitudinal movement of said first piston means in relation to said body; and anchor-actuating means including selectively operable motor means mounted on said body and having a rotatable shaft adapted for rotation upon operation of said motor means, hydraulic means including second piston means including a piston member movably disposed on said body and having a first enlarged portion and a second reduced portion respectively adapted for successive movement into first and second piston chambers upon movement of said second piston means on said body, conduit means fluidly coupling said piston chambers to said first piston means, and means coupling said piston member and said motor shaft and cooperatively arranged for moving said piston member upon rotation of said motor shaft.

Claim 10

A well tool adapted for suspension in a well bore from an electric cable and comprising: a body; wall-anchoring means on said body and including a first piston member slidably mounted on said body and defining therebetween a first piston chamber adapted to receive a pressured fluid for selectively moving said first piston member along said body, a plurality of first and second rigid links pivotally coupled to one another between said body and said first piston member; and actuating means including a selectively operable electric motor having a rotatable shaft, a second piston chamber on said body and having an enlarged portion and a reduced portion, a second piston member slidably mounted on said body having an enlarged portion and a reduced portion respectively adapted for movement into said enlarged and reduced chamber portions upon movement of said second piston member, conduit means intercoupling said piston chambers, and motion-translating means intercoupling said motor shaft and said second piston member and adapted for selectively moving said second piston member upon rotation of said motor shaft.

Claim 11

A well tool adapted for suspension in a well bore from an electric cable and comprising: a body; wall-anchoring means on said body and including a first piston member slidably mounted on said body and defining therebetween a first piston chamber adapted to receive a pressured fluid for selectively moving said first piston member along said body, a plurality of first and second rigid links pivotally coupled to one another between said body and said first piston member; and actuating means including a selectively operable electric motor having a rotatable shaft, a second piston chamber on said body and having an enlarged portion and a reduced portion, a second piston member slidably mounted on said body having an enlarged portion and a reduced portion respectively adapted for movement into said enlarged and reduced chamber portions upon movement of said second piston member, conduit means intercoupling said piston chambers, and motion-translating means intercoupling said motor shaft and said second piston member and adapted for selectively moving said second piston member upon rotation of said motor shaft.

Claim 12

The well tool of claim 8 further including: wall-engaging means operatively mounted on said rigid links and adapted for anchoring engagement with a well bore wall upon outward movement of said rigid links.

Claim 13

The well tool of claim 8 wherein said motor shaft is threaded and said motion-translating means include a nut coupled to said second piston member and cooperatively arranged on said threaded shaft for moving said second piston member into said second piston chamber upon operation of said electric motor.