Currently, a significant volumes of oil is extracted under complicated conditions, which include a significant slope of the well, as well as the rise of the reservoir medium from horizontal branches and high-viscosity oil. At the same time, a significant part of wells with high-viscosity oil, in order to increase the inflow, are drilled with a horizontal tap. Equipping most wells with sucker-rod pumps and the ability to adjust the length and number of strokes of the polished rod in a wide range allows to use these pumps in complicated conditions. The design features of the sucker-rod pumps such as their limited diameter and the coaxial arrangement of the valves with partial overlap of the valve body passage by the shut-off valve body significantly reduce these pumps throughput. Due to limited weight ball locking body does not always provide a tight overlap of the seat channel, especially when lifting high-viscosity oil and in inclined wells. So, the creation of rod pumps with full-flow valves those ensure the efficient operation of pumps in the environment of high-viscosity oil, as well as installed in inclined and horizontal wells is relevant. The article is considers the design and principle of operation of a rod pump with a movable cylinder and a controlled discharge valve, in which the valves are moved coaxially to the cylinder. In 2019-2021 the proposed sucker-rod pump has successfully passed pilot tests at the Vishnevo-Polyanskoye field of Oil and Gas Production Department Nurlatneft.
References
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3. Patent RU 2125184 C1, Oil-well sucker-rod pump unit, Inventors: Khaliullin F.Kh., Persiyantsev M.N.
4. Patent RU 2169290 C1, Oil-well sucker-rod pump, Inventors: Zakharov B.S., Bogomol'nyy E.I., Drachuk V.R.
5. Patent RU 2692588 C1, Pump, Inventors: Valitov M.Z., Nurgaliev R.Z., Bikbulatova G.I., Shulin V.S., Ganiev T.A.
6. Patent RU 2708764 C1, Bottom-hole sucker-rod pump, Inventors: Valitov M.Z., Nurgaliev R.Z., Bikbulatova G.I.
