The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1989
Filed:
Mar. 07, 1988
Jeffrey J Lembcke, Broken Arrow, OK (US);
Brian Shaw, Broken Arrow, OK (US);
Baker Hughes Incorporated, Houston, TX (US);
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.