FIELD: oil industry, particularly used in wells with complicated operation because of discrete material accumulation at well bottom and bottomhole formation zone.
SUBSTANCE: device comprises flow string, sucker-rod pump and accumulation container. Pump piston is rigidly connected to the flow string. The accumulation container is arranged between the pump cylinder and liner provided with check valve. The device also has connection pipe coaxially connected to upper part of the cylinder. The connection pipe has pouring orifice and piston stroke limiter. The flow string has pouring orifice arranged in lower part thereof.
EFFECT: increased strength and operational reliability.
2 cl, 1 dwg
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