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. 31, 1992
Filed:
Sep. 27, 1990
Derryl G Schroeder, Houston, TX (US);
Western Atlas International, Inc., Houston, TX (US);
Abstract
A carrier apparatus for a radioactive well logging instrument is disclosed that includes an elongated generally cylindrical tool body adapted for wireline suspension within a well borehole and mounting an elongated sensor pad assembly carrying a radioactive source and at least one detector and adapted for a nesting fit with the tool body. Knuckle joint links mounted on the tool body engage opposite ends of the sensor pad for laterally extending the pad assembly from the tool body into contact with the borehole wall. The knuckle joint links provide independent preselected force loading to each end of the pad assembly and permit articulation of the pad assembly with respect to the tool body axis for maintaining the sensor pad assembly in contact with the borehole wall under rugose conditions. In addition, a pair of decentralizing arms are mounted on the tool body on the side opposite the side carrying the sensor pad assembly for contacting the borehole wall and decentering the longitudinal axis of the tool body in the borehole in the direction of extension of the sensor pad assembly. A pair of spring assemblies are disposed in the tool body and cooperate with each of the decentralizing arms for providing independent preselected force loading to each of the arms and applying a predetermined decentralizing force load to the borehole wall. The knuckle joint links, the decentralizing arms and the spring asemblies are actuated by motors mounted on the carrier and applying loading forces to the decentralizing arms.