METHOD FOR SAFE LOWERING OF EQUIPMENT INTO WELL AND DEVICE FOR REALIZATION OF SAID METHOD Russian patent published in 2005 - IPC

FIELD: oil industry.

SUBSTANCE: all equipment-hoisting operations are performed during underground well maintenance prior to lowering pumping equipment. Equipment is mounted in tail piece lowered into well. After extraction of pumping equipment from the well, end piece with closed end is lowered, having calculated length, dependent on depth of perforation range. Then specially made branch pipe is lowered into well with slit outlet for geophysical cable. Branch pipe with slit outlet is rigidly connected to pipe pumping filter. Then equipment is lowered into tail piece in such a way, that geophysical cable was inserted through slit outlet into behind-pipe area of well. Further, pumping equipment is lowered, including tubing string, well sucker-rod pump and bars column suspension. In such a way, equipment is effectively positioned in tail piece, and connection to secondary equipment is maintained through geophysical cable, connected to tubing string by braces.

EFFECT: higher safety.