Radiant energy – Geological testing or irradiation – With drill or drilling
Patent
1987-11-24
1989-07-04
Anderson, Bruce C.
Radiant energy
Geological testing or irradiation
With drill or drilling
2504971, G01V 500, G21F 502
Patent
active
048453595
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.
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Koopersmith & Barnett, "Environmental Parameters Affecting Neutron Porosity, Gamma Ray, and Resistivity Mesurements Made While Drilling", SPE 16758, Sep. 1987.
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Anderson Bruce C.
Borst Stephen L.
Schlumberger Technology Corporation
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