G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 5/04 (2006.01) E21B 29/02 (2006.01) E21B 43/119 (2006.01) E21B 49/00 (2006.01)
Patent
CA 2131595
ABSTRACT OF THE DISCLOSURE In the representative mode for practicing the invention disclosed herein for accurately positioning tubing-conveyed well bore apparatus in a well bore a retrievable MWD tool having a radiation detector is positioned in the lower portion of a tubing string carrying a tubing-conveyed perforator carrying shaped explosive charges. Once the tubing string has been lowered into a well bore, the MWD tool is operated for transmitting signals which are representative of the radioactive characteristics of either a radioactive marker at a known depth or the formations adjacent to the MWD tool. The signals are correlated fordetermining the location of the tubing-conveyed perforator within the well bore. The correlated data is used for adjusting the tubing string so as to accurately position the tubing- conveyed perforator at a desired depth location.
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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