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High-temperature-resistant slow-expansion water-absorbing expansion resin plugging aid used in the field of oilfield drilling

A water-swelling, high-temperature-resistant technology, applied in the field of plugging aids, can solve the problems of reduced swelling performance and poor temperature resistance of water-absorbing swellable resins, and achieve the effects of improving pressure bearing capacity, not easy to fall off, and good bonding

Active Publication Date: 2020-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the expansion performance of the conventional expansion material is reduced after it enters the lost zone due to rapid expansion in the wellbore, and because the conventional cross-linking agent N,N-methylenebisacrylamide is easily hydrolyzed at high temperature, so that Water-swellable resin has poor temperature resistance

Method used

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  • High-temperature-resistant slow-expansion water-absorbing expansion resin plugging aid used in the field of oilfield drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 156.84g of water into a self-made reaction tank, slowly add 13.07g of bentonite while stirring, and after the soil is completely dispersed, add 20.91g of acrylic acid, 52.28g of acrylamide, and 16.21g of 2-acrylamide-2-methylpropane After the sulfonic acid is completely dissolved, pass nitrogen gas for 0.5h at 3°C, and then add 1.3g of cross-linking agent (the mass ratio of triallyl ammonium chloride to N,N-methylenebisacrylamide is 1: 1), 0.78g of sodium sulfite and ammonium persulfate mixed initiator, heated up to 50 ° C for 4 hours, took out and cut into pieces, dried, crushed and granulated, and sieved, leaving 6-10 mesh samples for later use; Fatty acid and 8g of absolute ethanol, slowly warm up to 65°C, after the stearic acid is completely dissolved, add 2g of the above-mentioned 6-10 mesh water-absorbing swelling resin, continue the reaction for 6h, transfer it to a tray, put it in a 45°C oven, The solvent absolute ethanol was removed to obtain a high tempera...

Embodiment 2

[0027] Put 156.84g of water into a self-made reaction tank, slowly add 13.07g of bentonite while stirring, and after the soil is completely dispersed, add 26.14g of acrylic acid, 37.12g of acrylamide, 26.14g of 2-acrylamide-2-methylpropane After the sulfonic acid is completely dissolved, pass nitrogen gas for 1 hour at 5°C, and then add 1.3 g of cross-linking agent (the mass ratio of triallyl ammonium chloride to N,N-methylenebisacrylamide is 4:1) ), 0.78g sodium sulfite and ammonium persulfate mixed initiator, heated up to 70°C for 2 hours, took out and cut into pieces, dried, crushed and granulated, and sieved, leaving 6-10 mesh samples for later use; add 10g stearin to the reactor acid and 10g of absolute ethanol, and slowly warm up to 80°C. After the stearic acid is completely dissolved, add 10g of the above-mentioned 6-10 mesh water-absorbing swelling resin, continue the reaction for 6h, transfer it to a tray, and put it in an oven at 30°C. The solvent is removed by absol...

Embodiment 3

[0029] Put 209.12g of water into a self-made reaction tank, slowly add 10.17g of bentonite while stirring, and after the soil is completely dispersed, add 10.46g of acrylic acid, 20.91g of acrylamide, 10.46g of 2-acrylamide-2-methylpropane After the sulfonic acid is completely dissolved, pass nitrogen gas for 2 hours at 0°C, and then add 0.26 g of cross-linking agent (mass ratio of diallyl ammonium chloride to N,N-methylenebisacrylamide is 1:1) ), 0.026g sodium sulfite and ammonium persulfate mixed initiator, heated up to 30°C for 5h reaction, took out and cut into pieces, dried, pulverized, granulated and sieved, leaving 6-10 mesh samples for later use; add 10g stearin to the reactor acid and 30g of absolute ethanol, slowly warming up to 77°C, after the stearic acid is completely dissolved, add 20g of the above-mentioned 6-10 mesh water-absorbing swelling resin, continue the reaction for 1.5h, transfer it to a tray, and put it in an oven at 55°C, The solvent absolute ethanol ...

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Abstract

The invention relates to a high-temperature-resistant slow-expansion water-absorbing expansion resin plugging aid used in the field of oilfield drilling. The preparation method comprises: putting water into a reaction tank, adding bentonite, completely dispersing, sequentially adding acrylamide, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, completely dissolving, introducing nitrogenat a low temperature, sequentially adding a cross-linking agent and an initiator, heating to 30-70 DEG C, reacting for 2-5 h, drying, granulating, and screening; and adding a wrapping agent and a solvent into the reactor, slowly heating, adding a water-swelling resin after the wrapping agent is completely dissolved, and removing the solvent after the reaction is finished so as to obtain the high-temperature-resistant slow-expansion water-absorbing expansion resin. According to the invention, the obtained product can slowly expand in the early stage of water absorption, can rapidly achieve water absorption expansion within a short time in the later stage, has a delay time of longer than 1 h, has temperature resistance of 140 DEG C, can effectively plug at a high temperature, and can achieve good repairing effect.

Description

technical field [0001] The invention relates to a plugging aid used in the field of oil field drilling. Background technique [0002] Lost circulation is a complex problem in the process of drilling, cementing, logging, and workover. It causes drilling fluid to leak from the wellbore into the lost channel, which not only consumes a lot of mud and plugging materials, but also may cause well collapse and pipe sticking. , blowout, and even lead to major accidents such as wellbore scrapping, resulting in huge economic losses. Due to the high incidence of lost circulation, according to statistics, the incidence of lost circulation in the world accounts for 20% to 25% of the total number of drilling wells, and the treatment of lost circulation is a difficult point in oil drilling, especially the problem of complex lost circulation is particularly difficult. The loss of lost circulation accounts for more than 50% of the total loss of lost circulation, and it is difficult to succes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/02C08F222/38C08F2/44C09K8/467
CPCC08F2/44C08F220/56C09K8/426C09K8/467C08F220/06C08F220/58C08F226/02C08F222/385
Inventor 曾志强黄冬袁俊秀朱魁
Owner CHINA PETROLEUM & CHEM CORP
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