DOWN-WELL SUCKER ROD PUMP Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: pump can be used in completing and operation of oil, gas, water-intake, and injection wells. Pump has cylinder with suction well and plunger with delivery valve. Movable part of delivery valve is provided with stepped tail-piece with axial through-passage and additional delivery valve. Cylinder is provided with partition with hole for passing of stepped tail-piece. Its thicker part and partition are made in the form of spool-valve pair. Device is adapted for pumping out operation and for implosive treatment of well. In pumping out operation, thicker part of tail-piece stops before reaching partition. In implosive treatment of well, thicker and thinner parts of tail-piece go beyond partition. Aforesaid embodiment of pump widens its functional characteristics due to implosive treatment of well and bed. EFFECT: higher efficiency. 2 dwg