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Acid-soluble gel plugging agent for loose sandstone and preparation method thereof

A technology of sol gel and loss-stopping agent, applied in the field of oil and gas field drilling, can solve the problems of low loss-stopping success rate, long drilling time in the reservoir section, affecting reservoir productivity, etc., so as to improve the loss-stopping accuracy and reduce the problem of gel formation. Risk, the effect of improving the success rate

Inactive Publication Date: 2018-11-16
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the drilling process, conventional soluble granular lost circulation plugging agents are difficult to effectively seal such formations, resulting in a low plugging success rate, long drilling time in the reservoir section, and affecting the productivity of the reservoir

Method used

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  • Acid-soluble gel plugging agent for loose sandstone and preparation method thereof
  • Acid-soluble gel plugging agent for loose sandstone and preparation method thereof
  • Acid-soluble gel plugging agent for loose sandstone and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, weigh 10 parts of acrylamide and dissolve it in 84 parts of water, stir well, add 3 parts of diacetone acrylamide, stir well, add 3 parts of ethyl methacrylate acetoacetate, and stir at a speed of 5000 rpm 10min, so that the dispersion is uniform, forming a component.

[0024] Add 3 parts of bentonite to 97 parts of water, and stir for 30 minutes at a speed of 2000 rpm to disperse evenly, and let it stand for defoaming to form component 2.

[0025] In 99.65 parts of water, add 0.05 part of water-soluble slow-release capsule cross-linking agent (capsule core is dicumyl hydroperoxide, and capsule coat is chitosan) and 0.3 part of water-soluble slow-release capsule solidifying agent (capsule core is Hexahydrophthalic anhydride, the capsule coating is a polyvinylidene chloride copolymer), and stirred for 20 minutes under the condition of a rotating speed of 2000 rpm to make the dispersion uniform and form component three.

[0026] In 96.7 parts of water, first add 0...

Embodiment 2

[0029] First, weigh 12 parts of acrylamide and dissolve it in 80 parts of water, stir well and add 4 parts of N-hydroxyethyl acrylamide, after stirring well, add 4 parts of hydroxyethyl methacrylate, at a speed of 5000 rpm Stir for 10 minutes to make the dispersion uniform and form component one.

[0030] Add 4 parts of bentonite to 96 parts of water, and stir for 30 minutes at a speed of 2000 rpm to disperse evenly, and let it stand for defoaming to form component 2.

[0031] In 99.4 parts of water, once add 0.1 part of water-soluble slow-release capsule cross-linking agent (capsule core is dicumyl hydroperoxide, and capsule coat is chitosan) and 0.5 part of water-soluble slow-release capsule solidifying agent (capsule core is Triethylenetetramine, the capsule coating is methyl cellulose), and stirred for 20 minutes under the condition of 2000 rpm at a rotating speed to make the dispersion uniform and form component three.

[0032] In 95.5 parts of water, first add 0.5 parts...

Embodiment 3

[0035] First, weigh 15 parts of acrylamide and dissolve it in 75 parts of water, stir well and then add 5 parts of methinebisacrylamide, after stirring well, add 2 parts of hydroxyethyl methacrylate and 3 parts of ethyl methacrylate , Stir for 10 minutes at a rotational speed of 5000 rpm to make the dispersion uniform and form component one.

[0036] Add 5 parts of bentonite to 95 parts of water, and stir for 30 minutes at a speed of 2000 rpm to disperse evenly, and let it stand for defoaming to form component 2.

[0037] In 99.45 parts of water, add 0.15 part of water-soluble sustained-release capsule cross-linking agent (capsule core is dicumyl hydroperoxide, and capsule coat is chitosan) and 0.5 part of water-soluble sustained-release capsule solidifying agent (capsule core is Triethylenetetramine, the capsule coating is ethyl cellulose), and stirred for 20 min under the condition of 2000 rev / min at a rotating speed to make the dispersion uniform and form component three. ...

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Abstract

The invention discloses a high-strength acid-soluble gel plugging agent for loose sandstone and a preparation method thereof. The plugging agent is prepared from a component I, a component II, a component III and a component IV, the component I is prepared from the following raw materials in parts by mass: 10-15 parts of acrylamide, 3-5 parts of modified acrylamide, 3-5 parts of modified hydroxyethyl acrylate and 75-84 parts of water, the component II is prepared from the following raw materials in parts by mass: 3-5 parts of bentonite and 95-97 parts of water; the component III is prepared from the following raw materials in parts by mass: 0.05-0.2 part of water-soluble slow-release capsule cross-linking agent, 0.3-0.5 part of water-soluble slow-release capsule curing agent and 99.3-99.65parts of water; and the component IV is prepared from the following raw materials in parts by mass: 3-5 parts of acid catalytic encapsulated gel breaker, 0.3-0.5 part of a surfactant and 96.7-94.5 parts of water. According to the high-strength acid-soluble gel plugging agent and the preparation method thereof, the gel breaker is released by controlling the acidification and dissolution of an acid-soluble capsule coating, so that gel breaking is realized, and plugging of the plugging agent to a seepage channel of a reservoir stratum is relieved.

Description

technical field [0001] The invention belongs to the field of oil and gas field drilling, and in particular relates to an acid-soluble gel plugging agent and a preparation method thereof. Background technique [0002] Lost circulation complex is one of the main drilling complexities in the drilling and completion process. Frequent occurrence of lost circulation complex will lead to an increase in the timeliness of the complex, prolong the drilling cycle, and increase the drilling cost. In particular, frequent leakage of reservoir sections can also cause serious reservoir damage and affect reservoir productivity. At present, the difficulty of plugging is still a bottleneck restricting the efficient development of oil reservoirs in the world, especially the leakage of reservoir intervals. It is difficult for existing plugging technologies to take into account both high-efficiency plugging and reservoir protection. The permeability of unconsolidated sandstone reservoirs can usu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44
CPCC09K8/426C09K8/44
Inventor 田增艳张洁张坤文飞杨贺卫龙涛方景良王双威王信刘强李晓涵
Owner CNPC BOHAI DRILLING ENG
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