A kind of gel plugging agent and its preparation method and application

The technology of a leak-stopping agent and gel is applied in the field of the gel-stopping agent and its preparation, which can solve the problems of easy re-leakage, weak pressure bearing capacity, difficult pumping, etc., and achieves good inter-compatibility and strong cementing ability. , the effect of good liquidity

Active Publication Date: 2019-05-31
YANGTZE UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because the gel plugging agents in the existing gel plugging technology belong to the overall cross-linked gel, poor control of the adhesive time will easily lead to difficulty in pumping, and the gel cannot be cured, resulting in pressure after plugging Weak ability, prone to repeated leakage

Method used

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  • A kind of gel plugging agent and its preparation method and application
  • A kind of gel plugging agent and its preparation method and application

Examples

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preparation example Construction

[0033] The present invention also provides a preparation method of the gel plugging agent described in the above technical solution, comprising the following steps:

[0034] (1) mixing water and a thickener to obtain a mixed slurry;

[0035] (2) mixing the mixed slurry obtained in the step (1) with a density modifier to obtain a base liquid;

[0036] (3) mixing the base liquid obtained in the step (2) with the spherical gel to obtain a gel plugging agent precursor;

[0037] (4) Mix the precursor of the gel plugging agent obtained in the step (3) with the accelerator to obtain the gel plugging agent.

[0038] The invention mixes water and thickener to obtain mixed slurry. In the present invention, there is no special limitation on the mixing operation, and a mixing technical solution well known to those skilled in the art can be used. In the present invention, it is preferred to add the thickener to water under stirring conditions to obtain a mixed slurry. In the present in...

Embodiment 1

[0052] (1) At a stirring rate of 5000rpm, add 0.8 parts by weight of hydroxypropyl methylcellulose to 100 parts by weight of water to obtain a mixed slurry, and stir for 15 minutes;

[0053] (2) At a stirring rate of 5000 rpm, 35 parts by weight of potassium chloride were added to the mixed slurry to obtain a base liquid, and stirred for 15 minutes;

[0054] (3) At a stirring rate of 350rpm, 10 parts by weight of spherical gel with a particle size of 0.5-2 mm was added to the base liquid, and stirred for 4 minutes to obtain a gel plugging agent precursor;

[0055] (4) At a stirring rate of 350 rpm, 3 parts by weight of diethylaminopropylamine was added to the precursor of the gel plugging agent, and stirred for 4 minutes to obtain the gel plugging agent.

[0056] The gel plugging agent prepared in this example was tested with a high-temperature and high-pressure crack plugging instrument, and a crack with a width of 1.0 mm was plugged at 80°C. The performance test results are ...

Embodiment 2

[0058] (1) At a stirring rate of 4000rpm, 0.8 parts by weight of guar gum was added to 100 parts by weight of water to obtain a mixed slurry, and stirred for 20 minutes;

[0059] (2) At a stirring rate of 4000 rpm, 30 parts by weight of sodium chloride was added to the mixed slurry to obtain a base liquid, and stirred for 20 minutes;

[0060] (3) At a stirring rate of 300 rpm, 10 parts by weight of spherical gel with a particle size of 0.5-2 mm was added to the base liquid, and stirred for 5 minutes to obtain a gel plugging agent precursor;

[0061] (4) At a stirring rate of 300 rpm, 5 parts by weight of m-xylylenediamine was added to the precursor of the gel plugging agent, and stirred for 5 minutes to obtain the gel plugging agent.

[0062] The gel plugging agent prepared in this example was tested using a high-temperature and high-pressure crack plugging instrument, and a crack with a width of 2.0 mm was plugged at 80°C. The performance test results are shown in Table 1.

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Abstract

The invention provides a gel plugging agent as well as a preparation method and application thereof. The gel plugging agent provided by the invention is prepared from the following components in parts by weight: 100 parts of water, 15 to 20 parts of spherical gel, 0.6 to 1.1 parts of thickener, 3 to 6 parts of accelerant and 0 to 50 parts of density regulator. The gel plugging agent provided by the invention is good in fluidity and easy to pump up; the spherical gel per se has a bridge plugging effect, is good in intermiscibility, is strong in cementing power with rock, and can be squeezed into a leakage zone under temperature and pressure actions to form wholly motionless gel completely plugging the leakage zone, and the strength is gradually enhanced until the gel is solidified; the gel plugging agent cannot be wholly solidified and inter-linked, only the spherical gel per se is solidified, the solidified spherical gel can be extracted out, the construction is safe, and plug sweeping is not needed. The preparation method provided by the invention is simple, convenient and practical, and is suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to the technical field of oil and gas engineering, in particular to a gel plugging agent and its preparation method and application. Background technique [0002] Lost circulation is the phenomenon that drilling fluid enters the leaky layer due to the positive pressure difference due to cracks, faults or caves in the rock during the drilling process. With the deepening of oil and gas exploration and development, the number of formations with large fractures and karst caves and complex loss formations has gradually increased, and the loss of oil and gas has become a technical problem that hinders the smooth progress of oil and gas exploration and development. Once the lost circulation occurs, it is necessary to carry out the plugging operation. In the drilling plugging operation, the plugging material is usually pumped to the leaky layer by pumping equipment. After the plugging material forms a barrier layer in the leaky layer, sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 许明标舒曼由福昌
Owner YANGTZE UNIVERSITY
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