GEAR FOR INVESTIGATION OF WELLS Russian patent published in 2000 - IPC

FIELD: running of oil wells. SUBSTANCE: invention is intended for development of gear making it feasible to record flow rate continuously and to decrease time needed for restoration of level in well and time to take measurements which in the long run makes it possible to increase authenticity and productivity of measurements. Proposed gear includes flowmeter lowered on logging cable and cylindrical fluid expulsor pump run into well on separate cable. Fluid expulsor pump is fabricated in the form of string of sealed pipes with non-return inlet and non-return outlet valves located correspondingly in lower and upper parts of string. Constant speed of lowering and lifting of expulsor pump provides for constancy of level of fluid in well and correspondingly for constancy of flow rate of fluid in shaft of well. Availability of inlet and outlet non- return valves enables internal space of expulsor pump to be filled and rise of level to be reduced while expulsor pump is lowered into fluid. EFFECT: increased authenticity and productivity of measurements. 1 dwg