WELL SUCKER-ROD PUMP SET Russian patent published in 1996 - IPC

FIELD: oil industry. SUBSTANCE: well sucker-rod pump set is designed for evaluation of high-viscous crude oils. Ring pressure valve 11 which seat 13 is coupled to upper butt 14 of armature is put on rod 8 of spring armature 12. Lower end 15 of armature is manufactured in the form of lift limiter of valve 11 with shutting element 16 of poppet type. With change of position of plunger 6 first injection of well fluid from chamber above plunger 4 takes place through valve 11 into space of string of pump pipes 1 and then of suction fluid through suction valve 10 into chamber above plunger of cylinder 3 of sucker-rod pump 2. Leaks through check valve 17 of plunger originated in this case are relieved from chamber 5 under plunger into chamber above plunger. EFFECT: increased operational efficiency of pump set. 3 dwg