WELL ROD PUMPING UNIT Russian patent published in 2018 - IPC F04B47/02 E21B43/00 F15B1/00 

FIELD: engines and pumps; oil and gas industry.

SUBSTANCE: invention relates to oil recovery techniques and, in particular, to downhole sucker rod pumps. Device includes a sucker rod pump, a string of pump pipes and rods and a wellhead air-compensator. This pneumatic compensator consists of two hemispheres. They are fastened together by pins and installed in a sealed environment that is insulated from the environment. Inside the chamber, a well is drilled with a depth exceeding the depth of freezing of the soil. Well is closed by a metal grate. Camera body has a hinged cover. Working cavity of the air compensator is connected to the annulus of the well through the spring safety valve.

EFFECT: reduction in the metal capacity level of the air-compensator and increase in its efficiency in cold weather conditions.

1 cl, 2 dwg