Horizontal well section testing method by adopting soluble rubber sleeve packer

A testing method and sol-gel technology, which can be used in sealing/sealing, measurement, earth-moving drilling, etc., can solve the problems of high friction between the well wall and the rubber cylinder, and difficulty in unsealing, and achieve reliable and low-cost sealing. Effect

Active Publication Date: 2015-05-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of difficulty in unsealing due to excessive friction between the well wall and the rubber tube caused by the excessive friction force of the well wall and the rubber tube if the rubber tube of the conventional packer cannot be retracted when unsealed.

Method used

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  • Horizontal well section testing method by adopting soluble rubber sleeve packer
  • Horizontal well section testing method by adopting soluble rubber sleeve packer

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Experimental program
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Embodiment 1

[0026] In order to overcome the problem of difficulty in unsealing due to the excessive friction between the well wall and the rubber tube caused by the rubber tube being turned over if the rubber tube of the conventional packer cannot be retracted when it is unsealed, this embodiment provides a The sol cartridge packer implements a horizontal well segmented testing method, including the following steps:

[0027] 1) The well is drilled with a well gauge; the well is drilled to the artificial well bottom of the operating well to ensure that the wellbore is unobstructed;

[0028] 2) Coat a layer of temperature control film on the surface of the sol tube packer 2 of the sol tube packer, and match the sol tube packer 2 coated with the temperature control film with the downhole switch 1, the centralizer, and the tubing for the oil well pump. Connected into a string tool string, the centralizer is located at both ends of the sol-sol cartridge packer 2;

[0029] 3) Run the pipe stri...

Embodiment 2

[0035] Such as figure 1 and figure 2 As shown, this embodiment provides a specific implementation process of using the soluble rubber cartridge packer to realize the horizontal well segmented test method for horizontal well three-stage segmental testing, wherein there are three sets of downhole switches, and the soluble rubber cartridge packer There are two spacers, and the specific operation process is as follows:

[0036] 1) Drain the well with the drilling gauge; from the well to the artificial well bottom of the operating well, if there is blockage in the middle of the well, perform circular flushing or repair the cause of the obstruction before proceeding with the well operation to ensure the wellbore is unobstructed.

[0037] 2) Coat a layer of temperature control film on the surface of the sol tube of the sol tube packer 2 (the temperature control film can be purchased from Nanjing Shousu Special Engineering Plastic Products Co., Ltd.), put the sol tube coated with th...

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Abstract

The invention belongs to the technical field of the oil production engineering in the oil field, and particularly provides a horizontal well section testing method by adopting a soluble rubber sleeve packer. The method comprises the following steps: firstly, wiper trip is carried out by a wiper trip tool; secondly, the surface of a soluble rubber sleeve is coated with a layer of a temperature control film, and a pipeline column tool string is formed by connecting of the soluble rubber sleeve packer, an downhole switch gear, a centralizer and an oil-well pump through an oil pipe in a matching mode; thirdly, the pipeline column tool string formed in the second step is descended to a pre-set position into the well once to carry out testing; fourthly, the testing section layer is opened through the soluble rubber sleeve packer, and sectionalizing testing is carried out on the to-be-pumped layer of the oil well; fifthly, after the testing is finished, the soluble rubber sleeve on the soluble rubber sleeve packer is automatically dissolved; sixthly, after the soluble rubber sleeve finishes dissolving, the tested pipeline tool string is taken out. The soluble rubber sleeve on the soluble rubber sleeve packer is automatically dissolved after the horizontal well fracturing testing is finished, and the defect that a the dissolution is difficult caused by the greater friction force of the well wall and the rubber sleeve due to the fact that a common packer rubber sleeve cannot retract and the rubber sleeve turns outward during the dissolution is solved.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering in oil fields, and in particular relates to a horizontal well segmental testing method using a sol-gel cartridge packer. Background technique [0002] At present, in the stage-by-stage water-seeking test process of multi-stage fracturing horizontal wells in the oil field, self-sealing cup packers or hydraulic packers are usually used to open the test layer section by section production process. However, the wellbore trajectory of horizontal wells is complicated, and the contact probability between the working string and the packer and the inner wall of the casing increases. This process has high requirements on the performance of the packer. Shrinkage or eversion of the self-sealing cup packer rubber tube will cause excessive friction between the well wall and the rubber tube, which may cause the packer to fail to be unsealed, resulting in the packer being stuck downhole and res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/10E21B33/12
CPCE21B33/12E21B47/10
Inventor 朱洪征吕亿明黄伟王百牛彩云李亚洲李大建崔文昊常莉静罗有刚
Owner PETROCHINA CO LTD
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