METHODS FOR CONDUCTING TUBING-CONVEYED PERFORATING OPERATIONS IN WELL BORES

摘要

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 tubingconveyed perforator at a desired depth location.