Multi-chamber reciprocating liquid extracting device

Abstract

The invention provides a multi-chamber reciprocating liquid extracting device, belongs to the technical fields of petroleum industrial oil production engineering and geothermal industry water production engineering, and is suitable for large-displacement liquid-extracting and oil-increasing of high-water-content oil fields and large-displacement water production of a geothermal well. The multi-chamber reciprocating liquid extracting device comprises an upper pump cylinder, a lower pump cylinder, a hollow pull rod, an upper plunger and a lower plunger, wherein the upper pump cylinder is in communication with an oil pipe by virtue of a liquid discharge valve; a first fixed valve is arranged at the upper end of the upper pump cylinder, the lower pump cylinder is in communication with the upper pump cylinder, and a second fixed valve is arranged at the lower end of the upper pump cylinder; and the lower end of the hollow pull rod extends into the lower pump cylinder, the lower plunger is in a hollow structure and is in communication with the hollow pull rod, and the lower plunger is internally provided with a first traveling valve communicating with the lower space in the lower pump cylinder. According to the multi-chamber reciprocating liquid extracting device, the hollow pull rod is controlled to drive the upper plunger and the lower plunger to move up and down in a reciprocatingmode so that the multi-chamber reciprocating liquid extracting device can discharge liquid in the up-down stroke, and the efficiency of extracting crude oil by the multi-chamber reciprocating liquidextracting device is improved.

Description

technical field [0001] The invention belongs to the technical field of oil extraction engineering in the petroleum industry and water extraction engineering in the geothermal industry, and is suitable for large-volume oil extraction in high-water oil fields and large-volume water extraction in geothermal wells. More specifically, it relates to a multi-chamber reciprocating Extraction device. Background technique [0002] In the late stage of oilfield exploitation, the water content of the oil is high, and it is often necessary to increase the oil recovery by increasing the liquid production rate. However, for the commonly used submersible pumps at present, increasing the displacement will result in a decrease in the head and an increase in the head. But it will reduce the displacement and reduce the recovery rate of crude oil, which is not conducive to the recovery of crude oil. In addition, the coordinated development of the Beijing-Tianjin-Hebei region and the constructio...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a multi-chamber reciprocating liquid extraction device to solve the technical problem that the oil pump reduces the efficiency of crude oil recovery in the prior art

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