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

An oil-water separator and separator technology, applied in wellbore/well components, drill pipes, drill pipes, etc., can solve the problems of only 50% success rate, small processing capacity, affecting service life, etc., and achieve the processing capacity. Adjustable, high separation efficiency and simple structure

Inactive Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the present invention provides a super-hydrophilic downhole oil-water separator 90. The inside of the oil-water separator 90 is provided with three passages, which are respectively the outer annular passage 91 of the separator, the inner annular passage 92 of the separator and the main passage of the separator. Channel 93. Among them, the inner annular channel 92 of the separator is used for sealing the sucker rod to pass through, the outer annular channel 91 of the separator is used to store the separated water and form a water flow channel, and the main channel 93 of the separator is the liquid of crude oil with high water content. The crude oil with high water content is dehydrated while flowing through the main channel 93 of the separator, and the separated water enters the outer annular channel 91 of the separator, and the dehydrated crude oil continues upward through the main channel 93 of the separator. Therefore, the separator inner a...

Embodiment 2

[0037] Such as figure 2 As shown, the present invention also provides a rod pump injection-production process string 100 in the same well. The process string 100 is set in the casing, including the rod pump 12, the packer and the oil-water separation in the first embodiment. device 90. Rod oil well pump 12 can adopt the rod oil well pump of the prior art, as image 3 As shown, the present embodiment adopts the conventional rod well pump 12 commonly used in oil fields and mines at present. The rod well pump 12 includes a pump barrel 26, a plunger 27, a liquid outlet hole 28 in the upper part of the plunger, a liquid inlet hole 29 in the middle part of the plunger, a liquid outlet hole 30 in the lower part of the plunger, a liquid inlet channel 31, an upstream valve 32, and an annular cavity 33. Downstream Verse 34. The oil-water separator 90 is set above the rod well pump 12, and the number of packers is set according to the needs. In this embodiment, a lower packer 6 is se...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/38E21B43/20E21B17/00
CPCE21B17/00E21B43/20E21B43/385
Inventor 罗燕古光明智勤功姜东周娜孙衍东刘丙生肖萍高综启杜玮暄
Owner CHINA PETROLEUM & CHEM CORP
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