FIELD: oil industry.
SUBSTANCE: invention relates to the oil industry, namely to a sucker rod pumping unit. The installation contains a cylinder of small diameter 1, connected to a cylinder of large diameter 2 by a coupling-sub 3. A hollow plunger of small diameter 4 and a lower hollow plunger 5 of a large diameter, movably located in the corresponding cylinders 1 and 2, are rigidly connected with each other by a sub 6 with windows. Plunger 4 in the upper part is equipped with a ball valve of an increased standard size 7 and has a length equal to the length of the pump stroke plus the length of the cylinder 1. Below the sub 6 with windows there is a suction disc valve 8. Valve 8 contains a disc 9, a body 10, a seat 11, a centering mandrel 12, and the upper part is equipped with a spool element 13 with windows 14. The element 13, during the downward stroke of the plunger 4, tightly interacts with the inner cavity of the plunger 4. During the upward stroke, the well fluid flows through the windows 14 through the plunger 4 and valve 7 into the cavity of the tubing string. The mandrel 12 is connected by a rod 17 to a plunger element 18 having an outer diameter the same as the plunger 5 and located outside the cavity of the plunger 5. The housing 10 is rigidly connected to the sucker rod string 25.
EFFECT: invention is aimed at increasing the efficiency of the pump and increasing the reliability of the pump attachment unit.
1 cl, 4 dwg
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Authors
Dates
2021-12-28—Published
2021-07-22—Filed