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Highly-deviated well intelligent layered oil recovery string and work method thereof

A technology for layered oil recovery and high-inclination wells, which is applied to drilling pipes, casings, and production fluids, and can solve problems such as shutting down oil wells, affecting oil field production, and unfavorable production increase and stable production.

Active Publication Date: 2017-05-31
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the deepening of oilfield development, the comprehensive water cut of oil wells rises rapidly, and the water intrusion in some formations is serious, which may force oil wells to be shut down. This will directly affect the production of oilfields, which is not conducive to increasing and stabilizing production.

Method used

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  • Highly-deviated well intelligent layered oil recovery string and work method thereof
  • Highly-deviated well intelligent layered oil recovery string and work method thereof
  • Highly-deviated well intelligent layered oil recovery string and work method thereof

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] as attached Figure 1 to Figure 5 As shown, an intelligent layered production string for highly deviated wells includes casings arranged sequentially from outside to inside, layered sand control completion strings and layered production strings. The layered sand control completion string includes a top packer 14 arranged in the casing, at least one isolation packer 15 and a sand settling packer, and the packers are connected by screens, adjacent to each other. A productive zone is formed between two of said packers. The layered production string includes a downhole safety valve 4, a cable packer 5, a submersible electric pump unit 6, a pump condition instrument 7, a perforated pipe 8 and a round plug connected sequentially from top to bottom through a tubing 3 12: A cable positioning seal 9 is provided between the perforated pipe 8 and the round plug 12, sever...

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Abstract

The invention discloses a highly-deviated well intelligent layered oil recovery string. The string comprises a layered production string body, the layered production string body comprises a porous pipe and a round plug, and a passing cable positioning seal, a plurality of layered production allocation devices and at least one passing cable insertion seal are arranged between the porous pipe and the round plug; each layered production allocation device is connected with a ground controller through a steel armored cable, the ground controller is connected with an upper computer, each layered production allocation device corresponds to one oil layer, and sealing between different layers is achieved through the passing cable positioning seal and the passing cable insertion seals. A work method of the string includes the steps that pigging is conducted; joint debugging testing of the layered production allocation devices is normal, and the string and the steel armored cables are put into a well; examining seal is conducted on the string; a pump is started for production; fixed-point acidification is conducted. By means of the string, online stepless regulation of highly-deviated well layered oil recovery can be achieved, and fixed-point acidification can be conducted according to production requirements.

Description

technical field [0001] The invention relates to oilfield layered oil recovery technology, in particular to an intelligent layered oil recovery pipe string and an operation method for highly deviated wells. Background technique [0002] At present, the stratified development of production wells in offshore oilfields is mainly realized by the method of steel wire operation switch sliding sleeve. This method requires that the well deviation is not greater than 60° due to the steel wire operation, and the well deviation is greater than 60°. However, no good measures have been found to solve it, and the production is mainly carried out in a general way of joint mining. However, with the deepening of oilfield development, the comprehensive water cut of oil wells rises rapidly, and the water intrusion in some formations is serious, which may force the oil wells to be shut down. This will directly affect the oilfield production, which is not conducive to increasing and stabilizing p...

Claims

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Application Information

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IPC IPC(8): E21B43/14E21B17/00
CPCE21B17/00E21B43/14
Inventor 山金城代向辉赵仲浩郑举潘亿勇张延旭李虎王聚锋晁圣棋
Owner CHINA NAT OFFSHORE OIL CORP
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