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Reactable gel plugging agent and preparation method thereof

The technology of a leak-stopping agent and gel is applied in the field of reactable gel leak-stopping agent and its preparation, which can solve the problems of decreased strength, poor adaptability of the leakage layer, easy re-leakage, etc., so as to reduce repeated leakage and improve the bearing strength. and blocking effect

Active Publication Date: 2017-12-26
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of expansion multiple is beneficial to plugging large fractures and porosity loss, but it will also lead to a decrease in strength. Therefore, this kind of plugging agent needs to increase the plugging strength
[0005] In the face of leaky formations with complex geological conditions, such as formations with induced fractures and fractured formations, it is difficult for existing plugging technologies to effectively solve the problem of plugging
The existing plugging materials have poor adaptability to the leakage layer, and it is difficult to form a dense plugging layer, and the poor cementation of the plugging layer results in unsuccessful plugging or poor burst resistance of the plugging layer and easy re-leakage The main reason

Method used

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  • Reactable gel plugging agent and preparation method thereof
  • Reactable gel plugging agent and preparation method thereof
  • Reactable gel plugging agent and preparation method thereof

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preparation example Construction

[0046] The present invention provides a method for preparing the reactive gel plugging agent according to the above technical scheme, which includes the following steps:

[0047] 1) In an alkaline environment, react formaldehyde, melamine and a sulfonating agent to obtain an intermediate product;

[0048] 2) Under the action of an initiator, the intermediate product, vinyl monomer, N,N-methylenebisacrylamide and inorganic materials are reacted to obtain a gel plugging agent;

[0049] The vinyl monomer is two of acrylamide, N,N-dimethylacrylamide, vinylpyrrolidone, N,N-diethylacrylamide and 2-acrylamide-2-methylpropanesulfonic acid Or two or more;

[0050] The inorganic materials are calcium clay, silicon powder and wood powder.

[0051] Compared with the prior art, the reactable gel plugging agent prepared by the method provided by the present invention has the function of absorbing water, swelling and deforming, and can be well adapted to the missing channel; when drilling into the mi...

Embodiment 1

[0094] Weigh 50g of formaldehyde and pour it into a four-necked flask. Adjust the pH to 8.5 with triethanolamine. Then add 23.3g of melamine. After heating in a 60℃ water bath for 10 minutes, the melamine will dissolve and form a transparent solution; this transparent solution will be quickly heated to 70℃ After the reaction for 60 minutes, add 6.8 g of sodium metabisulfite, adjust the pH to 12 with NaOH aqueous solution, and raise the temperature to 80°C, and continue the reaction for 30 minutes to obtain the intermediate product;

[0095] Add 4g AMPS (2-acrylamide-2-methylpropanesulfonic acid) and 16g AM (acrylamide) into 60g of clean water, stir well and adjust the pH to 7 with aqueous sodium hydroxide; then add 0.04g of N, N-methylene bisacrylamide, 8g calcareous soil and 120g of the above-mentioned intermediate product, after stirring and dissolving, add 0.2g potassium persulfate, 0.2g sodium sulfite, and stand to react to form a gel; take out the product to granulate A reac...

Embodiment 2

[0100] Weigh 50g of formaldehyde and pour it into a four-necked flask. Adjust the pH to 8 with triethanolamine. Then add 20g of melamine. After heating in a 65℃ water bath for 15 minutes, the melamine will dissolve and form a transparent solution; this transparent solution will be quickly heated to 80℃. After 90 minutes of reaction, add 7.4 g of sodium sulfite, adjust the pH to 12 with NaOH aqueous solution, and raise the temperature to 90°C, continue the reaction for 120 minutes to obtain the intermediate product;

[0101] Add 16gAM (acrylamide) and 1g NVP (vinylpyrrolidone) into 60g of clean water, stir well and adjust the pH to 7 with aqueous sodium hydroxide; then add 0.06g of N,N-methylenebisacrylamide, 10g of Calcium soil and 120g of the above-mentioned intermediate product; after stirring and dissolving, add 0.2g of potassium persulfate and 0.2g of sodium sulfite, and let stand to react to form a gel; take out the product and granulate to obtain a reactive gel plugging agen...

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Abstract

The invention provides a reactable gel plugging agent and a preparation method thereof. The preparation method comprises the following steps: 1, reacting formaldehyde, melamine and a sulfonating agent in an alkaline environment to obtain an intermediate; and 2, reacting the intermediate, vinyl monomers N,N-methylenebisacrylamide and an inorganic material under the action of an initiator to obtain the gel plugging agent, wherein the vinyl monomer are two or more of acrylamide, N,N-dimethylacrylamide, vinyl pyrrolidone, N,N-diethylacrylamide and 2-acrylamide-2-methylpropanesulfonic acid; and the inorganic material is calcium soil, silicon powder and wood powder. The gel plugging agent can chemically polycondensate in a loss channel to realize the solidification, cementation and adsorption effects, and the loss channel and the plugging agent are cemented to form an integral body, so the bearing strength and the plugging effect are improved, and repeated loss is reduced. The invention also provides the reactable gel plugging agent.

Description

Technical field [0001] The invention relates to the field of drilling technology, in particular to a reactive gel plugging agent and a preparation method thereof. Background technique [0002] With the deepening of oil and gas exploration and development, the formations encountered in the drilling process become more and more complex. When drilling into broken or weakly cemented formations, fractured formations and multiple pressure formations, lost circulation is very easy to occur. [0003] In the process of leakage prevention and plugging in drilling engineering, due to the unknown physical properties of the leakage layer (such as holes, fracture size and distribution status), the properties of the plugging material have a low degree of matching with the leakage layer, resulting in a low success rate of complex well lost circulation. . For this reason, people have developed polymer gel (water-absorbing resin) plugging materials. Because they contain hydrophilic groups and funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/58C08F220/56C08F226/10C09K8/42
CPCC08F283/002C09K8/426C09K8/887C08F220/585C08F220/56
Inventor 刘文堂周亚贤耿晓慧姜雪清郝纪双杨建
Owner 中石化石油工程技术服务有限公司
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