G - Physics – 01 – V
Patent
G - Physics
01
V
358/3, 358/4
G01V 5/04 (2006.01) E21B 17/10 (2006.01) E21B 23/03 (2006.01) E21B 47/00 (2006.01) E21B 47/01 (2006.01)
Patent
CA 1290467
ABSTRACT OF THE DISCLOSURE In the practice of the present invention, new and improved MWD apparatus is cooperatively arranged to be coupled to a MWD tool arranged to be suspended in a borehole from a drill string and adapted for measuring at least one downhole condition not requiring irradiation by a radioactive source and at least one downhole condition requiring irradiation by a radioactive source. The apparatus includes a retrievable carrier for safely transporting a chemical radioactive source through the drill string between the apparatus of the invention and the earth's surface so that the carrier can be selectively returned to the surface whenever it is desired to remove the source from the borehole without affecting the subsequent operation of the MWD tool in measuring at least one downhole condition that does not require irradiation.
561221
Evans Mike
Hache Jean-Michel
Marienbach Edouard
Rhein-Knudsen Erik
Wraight Peter
Schlumberger Canada Limited
Smart & Biggar
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