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Method for sealing packer outside pipe with cement paste to auxiliary cement well

A packer and cement slurry technology, which is applied in the directions of sealing/isolation, earthwork drilling, wellbore/well parts, etc., can solve problems such as capsule liquid leakage, packer pressure relief failure, damage, etc., to achieve benefit Effects of production and operation, protection of oil and gas layers, and resolution of interlayer interference

Inactive Publication Date: 2008-09-03
SHENGLI OILFIELD PETROLEUM DEV CENT
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Problems solved by technology

[0005] The above-mentioned existing measures have a certain effect in the short term, but the capsule of the packer is quickly damaged under the action of factors such as downhole pressure, temperature, and chemical corrosion, and the liquid (mud or water) in the capsule leaks, causing the packer to leak. Pressure failure, loss of layer isolation

Method used

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  • Method for sealing packer outside pipe with cement paste to auxiliary cement well
  • Method for sealing packer outside pipe with cement paste to auxiliary cement well
  • Method for sealing packer outside pipe with cement paste to auxiliary cement well

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Embodiment Construction

[0034] Its technical scheme is: comprise the following steps:

[0035] (1) Referring to accompanying drawing 3(a), an external packer 8 is set at the position where the wellbore profile needs to be isolated, and is connected in series with the casings 9, 10 and the fixed valve 11 to go downhole;

[0036] (2) Connect the cement slurry expansion sealer external packer to assist cementing tools, connect the cementing truck to the special cement head, and cement the well through the special cement head 5 and casing 9;

[0037] (3) Referring to the accompanying drawing 3(b), after passing through the cement head valve, cut the hollow rubber plug 7 from the bumping rubber plug 3 to the hollow rubber plug 7, and then go down together to bump the cementing valve 11.

[0038] (4) Referring to the accompanying drawing 3(c), untie the threaded connection between the special cement head 5 and the casing 9, lift up the cement slurry expansion sealer outer packer to assist the cementing too...

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Abstract

The present invention relates to a method for well cementing assisted by grout inflatable external packer. Grout replacing of slop or water to inflatable packed external packer eliminates the hidden trouble of packer invalidation, which is equal to make a permanence firmly clapboard among layers. So the well cementing assisted by grout inflatable external packer is realized based on matching grout inflatable external packer assistant well cementing tools. The present invention realizes the technique of well cementing assisted by grout inflatable external packer, provides new efficient technique measure for interlayer expansion cement of breakthrough prevention of multilayer complex oil reservoir: using grout filling external packer can separate different pressure layer, and water, gas and oil layers, resolve problems of interlayer disturbing and breakthrough after well cementing efficiently. Also, using grout filling external packer can form permanence envelop to protect oil gas layer which is benefit for production and operation.

Description

1. Technical field: [0001] The invention relates to a cementing method in an oil field, in particular to a cementing-assisting method for sealing an external packer with cement slurry expansion. 2. Background technology: [0002] With the continuous development of oilfields, all major domestic oilfields have entered the middle and late stages of development. Combined with Figure A, more and more complex formation reservoirs are being developed. There may be multiple formations in one wellbore section. Phenomena such as layer shifting to low-pressure layer, etc., seriously affect production. It is necessary to effectively realize interlayer isolation. The existing technology is to use mud or water to expand and seal the external packer as an interlayer partition between the layers that need to be isolated. The process is realized as follows: [0003] 1. Run the casing, connect the outer casing packer [a1] in series, and its depth position is between the layers [a2] and [a3]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B33/12
Inventor 李安夏余金铃赵志勇李延军邱国清冀延民郝建忠张明星程军
Owner SHENGLI OILFIELD PETROLEUM DEV CENT
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