DEEP-WELL PUMPING PLANT (VERSIONS) Russian patent published in 2004 - IPC

FIELD: oil producing industry; sucker-rod pumping plants. SUBSTANCE: proposed plant contains tubing and sucker-rod strings, hollow plunger with delivery valve, cylinder with suction valve accommodating rod made for mechanical interaction with plunger. Free end of plunger is furnished with seat. Free of rod is provided with mating shutoff element. With plunger in lower position, seat and shutoff element form hermetically sealed pair cutting off plunger space. Free ends of plunger and suction valve are provided with pressure-type autocoupler consisting of upper and lower sections. Rod located in suction valve body is installed for axial displacement and rotation, being part of lower section of autocoupler coupled with suction valve body, and provided with journal-type catcher made for interaction with upper section. The latter is provided with mating guides provided in-turn butt-joining and release of autocoupler after each series of lowering to stop and at lifting of plunger. Plant can be furnished with pump tubing and sucker-rod strings, hollow plunger with delivery valve and cylinder with suction valve. Free end of plunger is provided with seat. Mating shutoff element is placed between suction valve body and free end of plunger to provide engagement with seat. Seat and shutoff element are made to cutoff plunger space. Invention makes it possible to improve industrial and ecological safety of wells owing to automatic cutoff of well from ground surface in case of tubing string parting. EFFECT: possibility of scheduled replacement of wellhead units and elements without killing of wells. 4 cl, 7 dwg