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Anti-backflow leak-stopping agent, preparation method and applications thereof

A kind of plugging agent and anti-return technology, applied in the field of plugging agent, can solve the problems of bridging material back-spitting, failure of plugging operation, poor anti-flooding ability of plugging layer, etc. The effect of improving the anti-return ability

Active Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The plugging layer formed by the bridging material has poor anti-flowback ability. Once the bottom hole pressure fluctuates, the bridging material is easy to "spit back", resulting in the failure of the plugging operation

Method used

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  • Anti-backflow leak-stopping agent, preparation method and applications thereof
  • Anti-backflow leak-stopping agent, preparation method and applications thereof
  • Anti-backflow leak-stopping agent, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Add 100g bisphenol A type epoxy resin in 1L high temperature and high pressure reactor, as

[0039]

[0040] Add 500ml of benzene, add 0.2g of benzoyl peroxide, heat up to 150°C, dissolve under stirring at a speed of 300r / min, add 20g of maleic anhydride through a feeder, and react at a constant temperature for 120min. The pressure in the kettle must not exceed 0.3MPa. After the pressure in the kettle dropped to zero, the material was discharged at room temperature, and distilled under reduced pressure at 90°C to obtain a brownish-yellow viscous liquid, which was the modified self-emulsifying epoxy resin. Then take 10-30 mesh quartz sand and heat it to 166°C; in mechanical stirring, add modified self-emulsifying epoxy resin to the hot quartz sand, wherein the quartz sand and modified self-emulsifying epoxy resin The weight ratio is 94:6, and the stirring is continued for 100-120 minutes; the temperature of the mixture of quartz sand and modified self-emulsifying epox...

Embodiment 2

[0042] Add 100g bisphenol A type epoxy resin in 1L high temperature and high pressure reactor, as

[0043]

[0044]Add 500ml of benzene, add 0.2g of benzoyl peroxide, heat up to 150°C, dissolve under stirring at a speed of 300r / min, add 20g of maleic anhydride through a feeder, and react at a constant temperature for 120min. The pressure in the kettle must not exceed 0.3MPa. After the pressure in the kettle dropped to zero, the material was discharged at room temperature, and distilled under reduced pressure at 90°C to obtain a brownish-yellow viscous liquid, which was the modified self-emulsifying epoxy resin. Then take 10-30 mesh quartz sand and heat it to 166°C; in mechanical stirring, add modified self-emulsifying epoxy resin to the hot quartz sand, wherein the quartz sand and modified self-emulsifying epoxy resin The weight ratio is 84:16, and the stirring is continued for 100-120 minutes; the temperature of the mixture of quartz sand and modified self-emulsifying epox...

Embodiment 3

[0046] Add 100g bisphenol A type epoxy resin in 1L high temperature and high pressure reactor, as

[0047]

[0048] Add 500ml of benzene, add 0.2g of benzoyl peroxide, heat up to 150°C, dissolve under stirring at a speed of 300r / min, add 20g of maleic anhydride through a feeder, and react at a constant temperature for 120min. The pressure in the kettle must not exceed 0.3MPa. After the pressure in the kettle dropped to zero, the material was discharged at room temperature, and distilled under reduced pressure at 90°C to obtain a brownish-yellow viscous liquid, which was the modified self-emulsifying epoxy resin. Then take 10-30 mesh quartz sand and heat it to 166°C; in mechanical stirring, add modified self-emulsifying epoxy resin to the hot quartz sand, wherein the quartz sand and modified self-emulsifying epoxy resin The weight ratio is 72:28, and the stirring is continued for 100-120 minutes; the temperature of the mixture of quartz sand and modified self-emulsifying epo...

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Abstract

The present invention relates to an anti-backflow leak-stopping agent, a preparation method and applications thereof. The anti-backflow leak-stopping agent comprises the following components, by weight, 20-30 parts of modified self-emulsifying epoxy resin wrapped sand, 10-20 parts of ultrafine calcium carbonate, 15-25 parts of fiber brucite, and 35-55 parts of a non-penetrant NPL-2. According to the anti-backflow leak-stopping agent, a leak stopping effect is significant, anti-backflow capability of the blocking layer can be effectively improved, the anti-backflow leak-stopping agent can be subjected to compatibility use with any drilling fluid systems, use environment requirements are low, economic cost is moderate, and a characteristic of easy generalization and application is provided.

Description

technical field [0001] The invention relates to a plugging agent used in petroleum drilling engineering, its preparation method and application. More specifically, the present invention relates to an anti-reflux plugging agent capable of effectively improving the anti-flowback ability of the plugging layer, its preparation method and application. Background technique [0002] The treatment of lost circulation is a difficult point in oil drilling. Lost circulation not only consumes drilling time, but also loses drilling fluid, increases drilling costs, and even induces a series of serious and complicated problems such as pipe sticking and blowout. The bridging plugging technology to deal with lost circulation has been widely used because of its convenient use and safe construction. Bridging plugging materials are generally granular, flake and fibrous materials. In the plugging operation, these three types of materials are used in combination with appropriate proportions and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/44
Inventor 石秉忠徐江张国梅春桂刘金华刘四海
Owner CHINA PETROLEUM & CHEM CORP
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