Super-hydrophilic underground oil-water separator and sucker-rod pump same-well injection-production process pipe string thereof

Abstract

The invention relates to a super-hydrophilic underground oil-water separator and a sucker-rod pump same-well injection-production process pipe string thereof. The oil-water separator is provided witha separator outer annular passage, a separator inner annular passage and a separator main passage. The super-hydrophilic underground oil-water separator is used for performing oil-water separation onoutput liquid of an oil producing layer under the ground; the output liquid with a high oil content is lifted to the ground respectively through respective liquid flow passages; and separated stratumwater is injected into a stratum water injection layer. The defects that a traditional gravity type oil-water separator has small treatment capacity, spiral-flow type oil-water separation needs to beused in cooperation with an electric submersible pump, and the like are overcome; and independent lifting and injection equipment is not needed to be externally connected. The super-hydrophilic underground oil-water separator can be directly applied to the sucker-rod pump same-well injection-production process and has the advantages of simple structure, safety, reliability, adjustable treatment capacity, stable structure and high separation efficiency.

Description

technical field [0001] The invention relates to an oil production device for high water-cut oil wells in the field of oil field development, in particular to a super-hydrophilic downhole oil-water separator and a rod pump same-well injection-production process string. Background technique [0002] In the middle and late stages of heterogeneous reservoir development, there are more and more wells with high water cut, and the water cut of many wells has reached 98%. The cost of surface produced fluid treatment has greatly increased, and it has reached or approached the economic and technical limit of production, making it impossible to continue production. In order to solve this problem, the same-well injection-production process was proposed, in which the produced fluid is separated from oil and water in the downhole and then lifted to the formation, which greatly reduces the water content of the produced fluid at the wellhead. At present, the downhole oil-water separation de...

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Problems solved by technology

Because the gravity oil-water separator is affected by the settling time, the processing capacity is not large, and the sedimentation components accumulate inside the separator, which seriously affects the service life, and the application in the mine field is gradually reduced; most of the wells currently use the cyclone oil-water separator. However, the cyclone oil-water separator needs to be used with an electric submersible pump, and cannot be applied to conventional rod pump oil production wells. According to the statistical data of field tests, its success rate is only 50%, and it cannot be widely used.

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