E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
358/3
E21B 19/00 (2006.01) E21B 23/00 (2006.01) E21B 47/00 (2006.01) E21B 47/01 (2006.01) G01V 5/04 (2006.01) G21F 5/00 (2006.01) G21F 5/02 (2006.01)
Patent
CA 1300284
Abstract A method for moving a radioactive source into and out of a well logging tool incorporated in the drill string is disclosed. Prior to moving the source, the logging tool is positioned sufficiently distant from and vertically under the drilling rig floor so as to avoid a hazardous radiation condition at the floor when the source is in its operative position in the tool. A tubular radiation shield containing the source is positioned at the end of the drill string hanging from the rotary table and a source manipulating device is engaged with the source. It is then lowered through the shield and the drill string into the tool. These steps are practiced in the reverse order when the source is being removed from the tool. An additional shield may be provided to envelop the first shield for added shielding during transportation or storage.
583850
Schlumberger Canada Limited
Smart & Biggar
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