Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1990-09-27
1992-03-31
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
G01V 504
Patent
active
051011042
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.
REFERENCES:
patent: 3654470 (1972-04-01), Wilson
patent: 3978939 (1976-09-01), Trouiller
patent: 4445032 (1984-04-01), Halker et al.
patent: 4588951 (1986-05-01), Ohmer
Beyer James E.
Fields Carolyn E.
Springs Darryl M.
Western Atlas International Inc.
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