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Separate zone production technical string capable of protecting oil reservoirs

A technology for oil layer protection and layered oil recovery, applied in the direction of drill pipe, casing, production fluid, etc., can solve the problems of not being able to protect the oil layer, and achieve the effects of reasonable pipe string structure design, convenient use, and convenient shutdown

Inactive Publication Date: 2013-01-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problem that the oil layer cannot be protected on the basis of the mechanical layered oil recovery production string, the present invention provides a layered oil recovery production process string for protecting the oil layer, which can not only seal the formation during the pump inspection operation, but also realize the non-stop during the pump inspection process. Well killing operation, avoiding well cleaning fluid or well killing fluid from entering the oil layer to pollute the oil layer, protecting the oil layer, improving the production time rate, reducing the cost, and prolonging the effective production period of the oil layer; it can also close or open any oil layer when the oil well is in production, so that the oil well does not Exploitation of moving sticking layer, throwing pipe string and changing layer

Method used

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  • Separate zone production technical string capable of protecting oil reservoirs
  • Separate zone production technical string capable of protecting oil reservoirs
  • Separate zone production technical string capable of protecting oil reservoirs

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with accompanying drawing:

[0013] The protected oil layer layered oil production process string of the present invention is composed of the oil pumping string and the protective oil layer throwing string, and the oil pumping string is composed of a switch 11, a core pipe 7, a plug 4, a screen pipe 3, a blowout prevention pump 2, and an oil pipe Column 1 is sequentially fixed and connected; the oil layer protection string is composed of plug 4, oil layer protector 9, safety joint 8, Y341 self-test seal packer 10, Y441 type packer 6, and hand 5 are fixedly connected in sequence , wherein, the oil extraction string switch 11 is inserted into the oil layer protector 9 of the oil layer protector 9, and the liquid inlet channel of the oil layer protector 9 is opened, and the crude oil enters the wellbore to meet the production needs.

[0014] More than 2 sets of oil layer protectors 9 can be inst...

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PUM

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Abstract

The invention relates to a separate zone production technical string capable of protecting oil reservoirs. The separate zone production technical string consists of a pumping string and an oil reservoir protecting releaser string. The oil reservoir protecting releaser string consists of a plug (4), an oil reservoir protector (9), a safety joint (8), a Y341 type self-examining packer (10), a Y441 type packer (6) and a releaser head (5) which are fixedly connected from bottom to top. A pumping string switch (11) is plugged into the oil reservoir protector (9) of the oil reservoir protecting releaser string and can be used for opening any production layers, and is convenient to switch on and switch off accurately. The string is simple, reasonable, convenient and practical in structural design, and can close a stratum without well killing during pump inspection, prevent flushing fluid or well killing fluid from entering the oil reservoirs to pollute the same and protect the oil reservoirs, and accordingly production efficiency can be increased, effective production periods of the oil reservoirs are prolonged, any oil reservoir can be opened during oil well production, and zone replacement production of oil well can be achieved without removing the jammed releaser string.

Description

technical field [0001] The invention relates to a layered oil recovery process string during oil well production in an oil field, in particular to a layered oil recovery process string used for protecting oil layers during pump inspection operations in low-energy oil wells. Background technique [0002] At present, most of the old blocks and some newly developed blocks in the oilfield have low formation energy. After the well killing operation, the killing fluid will pollute the oil layer, and the recovery period of the oil well will be long. The productivity of the recovered oil well will be greatly reduced, which directly affects the production of the oil well. [0003] For oil layer protection in operation, chemical methods are mostly used at present, which are realized by improving the performance of killing fluid, but due to high price and high cost, it is still difficult to popularize. [0004] With the deepening of oilfield development, the formation conditions are be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/06E21B43/14E21B33/122
Inventor 李志广谢华黄大云李怀文李川李风涛曾晓辉
Owner PETROCHINA CO LTD
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