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Composite temporary plugging agent for refracturing of horizontal well and temporary plugging method

A technology of repeated fracturing and temporary plugging agent, which is applied in chemical instruments and methods, drilling composition, earth-moving drilling, etc. Problems such as horizontal well construction and inability to soften and bond, to achieve the effect of improving the success rate of repeated fracturing, good plugging effect, and reducing the amount of use

Active Publication Date: 2017-10-13
北京斯迪莱铂油气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, for refracturing of horizontal wells, due to the need for staged reconstruction of horizontal wells, the operation time is very long, usually 3-10 days, and the above-mentioned temporary plugging agents with a dissolution or degradation time of 2-12 hours cannot meet the requirements of horizontal well construction. requirements
Moreover, if the construction is not smooth, it may take longer to deal with downhole accidents, so the requirements for the plugging strength and plugging time of the temporary plugging agent are higher
However, the current situation is that most of the temporary plugging agents that dissolve for a long time are rigid at a certain temperature and in a short time, but cannot be softened and bonded in a short time to form a low-permeability plugging layer with a pressure-bearing effect.

Method used

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  • Composite temporary plugging agent for refracturing of horizontal well and temporary plugging method
  • Composite temporary plugging agent for refracturing of horizontal well and temporary plugging method
  • Composite temporary plugging agent for refracturing of horizontal well and temporary plugging method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Take soluble polybutylene succinate (Anqing Hexing Chemical Co., Ltd.) as component A, pulverize it, and sieve out 4-8 mesh particles. After component A is soaked in tap water at 90°C for 10 hours, the bonding effect occurs, and the shape is as follows: figure 1 .

[0044] Partially hydrolyzed polyacrylamide (Beijing Xitao Technology Development Co., Ltd.) was used as component B, and granules of 10-20 mesh were sieved by crushing.

[0045] Put component A and component B into tap water respectively, within 8 minutes component A hardly swells, while component B swells about 3.2 times.

[0046] Mix component A and component B at a weight ratio of 4:1 to form a composite temporary plugging agent a. Put the composite temporary plugging agent a into tap water at 90°C. After 200 hours, the dissolution rate will reach more than 96%. The degradation curve is shown in figure 2 . The water-insoluble content of composite temporary plugging agent a was determined to be 4.5wt%...

Embodiment 2

[0056] Take soluble polyglycolic acid (Shenzhen Boli Biomaterials Co., Ltd.) as component A, pulverize it, and sieve out 4-8 mesh particles. After component A is soaked in tap water at 90°C for 10 hours, the bonding effect occurs.

[0057] The partially hydrolyzed copolymer of 2-acrylamide-2-methylpropanesulfonic acid and acrylamide (Beijing Xitao Technology Development Co., Ltd.) is used as component B, and the particles of 10-20 meshes are screened out by crushing. Put component A and component B into tap water respectively, within 10 minutes component A hardly swells, while component B swells about 4.2 times.

[0058] Mix component A and component B at a weight ratio of 5:1 to form a composite temporary plugging agent d. The composite temporary plugging agent d is put into tap water at 100°C, and after 200 hours, the dissolution rate reaches over 96%. The water-insoluble content of composite temporary plugging agent d was determined to be 4.5wt% after 240 hours at 90°C. ...

Embodiment 3

[0061] Soluble polyethylene lactide (Shenzhen Boli Biomaterials Co., Ltd.) was used as component A, which was pulverized and sieved to obtain 4-8 mesh particles. After component A is soaked in tap water at 90°C for 10 hours, the bonding effect occurs.

[0062] The copolymer of partially hydrolyzed acrylic acid and acrylamide (Shandong Taihe Water Treatment Technology Co., Ltd.) was used as component B, and granules of 10-20 mesh were screened out by crushing. Put component A and component B into tap water respectively, within 8 minutes component A hardly swells, while component B swells about 3.6 times.

[0063] Mix component A and component B at a weight ratio of 6:1 to form a composite temporary plugging agent e. The composite temporary plugging agent e is put into tap water at 90°C, and after 200 hours, the dissolution rate reaches over 96%. The water-insoluble content of composite temporary plugging agent e was determined to be 4.5wt% after 240 hours at 90°C.

[0064] Usi...

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Abstract

The invention provides a composite temporary plugging agent for refracturing of a horizontal well. The composite temporary plugging agent comprises a component A and a component B, wherein the component A is selected from at least one type of polyester polymers; the component B is selected from at least one type of acrylamide polymers, polymethyl fibers and polyvinyl alcohol. The composite temporary plugging agent has quick temporary plugging and lasting temporary plugging functions.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil and natural gas, in particular to a composite temporary plugging agent which can be used for repeated fracturing of horizontal wells, and a temporary plugging method in repeated fracturing of horizontal wells. Background technique [0002] At present, the temporary plugging agents used for refracturing of horizontal wells in oilfields mainly include water-soluble granular temporary plugging agents and fiber-type temporary plugging agents. A single type is used. [0003] Chinese patent application CN106150429A proposes a temporary plugging agent for multi-stage fracturing of shale gas and its application. The soluble fiber in the temporary plugging agent of the embodiment of this application forms a high-density spatial network structure, which effectively prolongs the temporary plugging time and achieves the purpose of replacing the bridge plug; the plugging effect is good, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/514E21B33/13
CPCC09K8/508C09K8/514E21B33/13
Inventor 薛世杰程兴生李永平张智勇谭建勇吴国涛王永贤
Owner 北京斯迪莱铂油气技术有限公司
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