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

FIELD: oil production industry. SUBSTANCE: sucker rod pump can be used in completing and operating of oil, gas, and injection wells. Pump has cylinder with suction valve, plunger with delivery valve. Plunger is provided with stepped tail-piece having axial through-passage and additional delivery valve. Additional delivery valve is located in axial passage of tail-piece. Cylinder is provided with lateral partition having hole for passing of stepped tail-piece. Thicker part of tail-piece and partition are made in the form of spool-valve pair. Device is adapted for pumping out operation and for implosive treatment of bed. At reciprocating movement of plunger, thicker part of tail-piece stops before reaching partition. At implosive operation, thicker and thinner parts of tail-piece go beyond partition. Aforesaid embodiment of down-hole sucker rod pump widens its functional characteristics due to its adaptation for implosive treatment of bed. EFFECT: higher efficiency. 2 dwg