Well tool stabilizer and method

Details Well tool stabilizer and method Well tool stabilizer and method

1988-03-07

1989-03-14

Novosad, Stephen J.

Wells

Processes

Placing or shifting well part

33178F, 166 64, 166241, E21B 1710, E21B 2300

Patent

active

048117927

ABSTRACT:
A mechanism for accurately positioning a well tool in axially concentric relationship to a well conduit comprises a housing having a plurality of peripherally spaced vertically extending slots therein. A stabilizer linkage is mounted in each slot, with one end of the linkage being pivotally secured in the slot and the other end free to move in an axial direction. Axially spaced anti-friction elements are carried on the linkage and are movable radially into engagement with the casing wall by axial movement of the other end of the stabilizer linkage. The other end of the stabilizer linkage is pivotally secured to a sleeve which is sealably and slidably mounted within the housing and defines a trapped fluid chamber which acts as a dashpot to delay radial expansion movement of the stabilizer linkage. A check valve cooperating with the trapped fluid chamber permits rapid radially retracting movement of the stabilizer linkage to permit the anti-friction elements to pass through restrictions in the well conduit during withdrawal of the tool.

REFERENCES:
patent: 2964110 (1960-12-01), Garwood et al.
patent: 3087552 (1963-04-01), Graham
patent: 3978924 (1976-09-01), Roesner
patent: 4523640 (1985-06-01), Wilson et al.
patent: 4557327 (1985-12-01), Kinley et al.
patent: 4615386 (1986-10-01), Briscoe
patent: 4619322 (1986-10-01), Armell et al.

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