Wells – Processes – With indicating – testing – measuring or locating
Patent
1985-04-22
1987-09-08
Suchfield, George A.
Wells
Processes
With indicating, testing, measuring or locating
73152, 166250, 175 41, 175 50, 250254, E21B 4704, E21B 4900, G01V 500
Patent
active
046917721
ABSTRACT:
A method for determining the permeability profile of an uncased borehole penetrating a subterranean formation by a natural gamma ray well logging technique in which particles containing gamma ray emitting nuclides are added to a thixotropic drilling mud used to drill the wellbore such that a radioactive filter cake of the particles forms along the face of the wellbore having substantially increased thickness and intensity of radiation emissions at depths corresponding to zones of high permeability in the subterranean formation. Preferably the additive is a mud weighting particle, such as barite, bearing adsorbed or mechanically mixed, naturally-occurring radioactive material, such as thorium-bearing bastnasite or thorium-bearing cerium oxide.
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Ebenhack Ben W.
Floran Robert J.
Bostich June M.
Sandford Dean
Suchfield George A.
Union Oil Company of California
Wirzbicki Gregory F.
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