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Acidizing temporary plugging agent as well as preparation method and application thereof

A technology of temporary plugging agent and cross-linking agent, which is applied in the field of acidified temporary plugging agent and its preparation, can solve the problems of incomplete degradation of acidified temporary plugging agent, complicated preparation technology, and low mechanical properties, etc., to achieve increased degradable performance, Broad application prospects and good mechanical properties

Active Publication Date: 2020-06-23
大庆市新万通科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, especially the incomplete degradation, low mechanical properties and complex preparation technology of the existing acidified temporary plugging agent, the present invention provides an acidified temporary plugging agent and its preparation method and application

Method used

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  • Acidizing temporary plugging agent as well as preparation method and application thereof
  • Acidizing temporary plugging agent as well as preparation method and application thereof
  • Acidizing temporary plugging agent as well as preparation method and application thereof

Examples

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preparation example Construction

[0031] The preparation method of used polybutylacrylate emulsion is:

[0032] (1) Add 300g of deionized water, 100g of butyl acrylate, 0.25g of dodecyl mercaptan, 1.2g of sodium lauryl sulfate, polyethylene Diol octyl phenyl ether 3.6g.

[0033] (2) Start the mechanical stirring, keep the rotation speed at 400rpm, emulsify at room temperature for 15 minutes, and pass nitrogen protection, and heat the reaction kettle to 70°C with a circulating water bath.

[0034] (3) Weigh 0.48 g of potassium persulfate, dissolve it in 8 mL of pure water, and inject it with a syringe.

[0035] (4) Keep the rotational speed at 400 rpm, react at 70° C. for 1 hour, then end the reaction, and cool to room temperature to obtain a polybutylacrylate emulsion.

Embodiment 1

[0037] A kind of preparation method of acidification temporary plugging agent, comprises steps as follows:

[0038] Add 2g sodium carboxymethylcellulose and 60g distilled water to the reaction kettle, stir and dissolve; then add 10g polybutylacrylate emulsion, 26.6g acrylamide, 1.4g maleic anhydride, 0.18g ethylene glycol diacrylate, 0.12 g ammonium persulfate, mixed evenly, and reacted at 45°C for 5 hours to obtain an elastic gel, which was granulated, dried, and pulverized to obtain an acidified temporary plugging agent.

Embodiment 2

[0040] A kind of preparation method of acidification temporary plugging agent, comprises steps as follows:

[0041] Add 2.5g sodium hydroxypropyl cellulose and 61g distilled water to the reaction kettle, stir and dissolve; then add 11g polybutylacrylate emulsion, 22.9g acrylamide, 1.0g acrylic acid, 0.14g ethylene glycol diacrylate and 0.11g Ammonium persulfate, mixed evenly, reacted at 45°C for 5 hours to obtain an elastic gel; the obtained gel was granulated, dried, and pulverized to obtain an acidified temporary plugging agent.

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Abstract

The invention provides an acidizing temporary plugging agent as well as a preparation method and application thereof. The acidizing temporary plugging agent is prepared from the following raw materials in percentage by mass: 1 to 10 percent of a high polymer material, 19 to 28 percent of a water-soluble monomer, 0.9 to 1.4 percent of a functional monomer, 9 to 15 percent of a nano toughening material, 0.12 to 0.34 percent of a weak cross-linking agent, 0.08 to 0.24 percent of an initiator and the balance of water. The degradation rate of the acidizing temporary plugging agent reaches 99% or above, the degradation time is adjustable, the effective plugging rate reaches 99%, and the construction requirement of the acidizing temporary plugging technology is met. Different cracks can be blocked by adjusting the particle size, and the self-degradable plugging agent is environmentally friendly, self-degradable, easy to flow back and wide in adaptability.

Description

technical field [0001] The invention relates to an acidizing temporary plugging agent and its preparation method and application, belonging to the technical field of oil field chemistry. Background technique [0002] my country's low-permeability oilfields have abundant petroleum geological reserves and great potential for development. After fracturing, the production of most low-permeability reservoirs has increased significantly, but the production is still limited. The fracturing and acidizing process can effectively improve the development level of low-permeability oilfield exploration. At present, the target layer of fracturing and acidizing is becoming more and more complex, so the requirements for the temporary plugging agent used are more stringent. The temporary plugging agent used in fracturing and acidizing construction not only has better compressive strength, but also needs to be acid-soluble and water-soluble. properties so that they can eventually be discharg...

Claims

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Application Information

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IPC IPC(8): C09K8/512
CPCC09K8/5083C09K8/512C09K2208/10
Inventor 李宝洪
Owner 大庆市新万通科技开发有限公司
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