UNDERGROUND WELL REPAIR METHOD Russian patent published in 2012 - IPC E21B33/08 

FIELD: oil and gas industry.

SUBSTANCE: underground well repair method involving the trip of well pump, killing of a well, performance of lifting and lowering operations and movement of well fluid differs by the fact that on the wellhead platform below the level of casing valve there installed is leak-proof well fluid collecting reservoir equipped with level gauge, inlet and outlet connection pipes, air supply connection pipe, valves; at that, inlet box of tight collecting capacity for well liquid is connected to casing valve or liquid collecting device; outlet connection pipe is connected to accumulation reservoir, and air supply connection pipe is connected to pneumatic system of lifting well repair unit; at that, during lowering of bottom-hole equipment to the well liquid there gathered is well liquid in a tight reservoir and pumped with air pressure to collecting reservoir.

EFFECT: use of the proposed method for underground well repair allows eliminating the contamination of the territory when downhole pumping equipment is being lowered and more effective use of the capabilities of the lifting well repair unit.

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