Automatic liquid replenishment rodless liquid flooding oil production device and oil production method

Abstract

The invention relates to an automatic fluid replenishment rodless liquid drive oil production device and an oil production method. The device includes a ground power system, a downhole liquid drive plunger pump structure and a pipe string structure; the pipe string structure can transport the power fluid to the downhole liquid drive plunger The pump structure can provide a liquid flow channel for the oil well output fluid to be transported to the ground; the downhole liquid drive plunger pump structure includes a pump barrel structure, and the first plunger and the second plunger are arranged in the pump barrel structure, and the ground power system includes an oil tank, The oil tank can be connected with the up-stroke isolation cylinder and the down-stroke isolation cylinder, and the down-stroke isolation cylinder can replenish liquid for the up-stroke isolation cylinder. The device and oil production method can realize automatic liquid replenishment and improve the service life. It can be used as a single well rodless liquid flooding oil production device, and can also be used as a cluster well group lifting rodless liquid flooding oil production system, especially suitable for special wells such as horizontal wells. type, which is crucial to the efficient development of cluster well groups.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to an automatic fluid replenishment rodless liquid flooding oil recovery device and an oil recovery method. Background technique [0002] For a long time, the rod lift device is the absolute main body of artificial lift, and the number of wells used accounts for more than 94% of the number of oil wells in China. With the increasing number of special well types represented by horizontal wells, the eccentric wear of the rod lifting rod tube is becoming more and more serious. Therefore, technical personnel have been constantly exploring rodless lifting technology for many years. The electric drive rodless lifting technology represented by electric submersible screw pump and reciprocating electric submersible pump is expanding the test scope. In terms of liquid drive rodless lifting technology, the progress so far has been unsatisfactory, but the unique cluster well...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic liquid replenishment rodless liquid flooding oil production device and oil production method, which overcomes the problem of eccentric wear of the rod lifting rod tube in the prior art. The device and oil production method can realize automatic liquid replenishment and improve the service life. It can be used not only as a single well rodless liquid flooding oil production device, but also as a cluster well group lifting rodless liquid flooding oil production system. It is especially suitable for special well types such as horizontal wells, and is very important for the efficient development of cluster well groups

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