Anti-swelling clay stabilizer and preparation method thereof

A clay stabilizer and anti-expansion technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited application range and poor temperature resistance, and achieve simple synthesis and preparation process, high anti-expansion rate, The effect of a wide range of raw material sources

Active Publication Date: 2022-08-05
SHOUGUANG XINHAI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is poor temperature resistance, and the temperature of many oil reservoirs has reached 200 °C, so its application range is limited

Method used

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  • Anti-swelling clay stabilizer and preparation method thereof
  • Anti-swelling clay stabilizer and preparation method thereof
  • Anti-swelling clay stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) successively add 0.02mol of sodium benzaldehyde-2,4-disulfonate, 0.02mol of sodium cyanoborohydride, 0.02mol of dimethylamine, 31g of methanol in the reactor, heat under reflux for 4h, evaporate to dryness;

[0039] (2) Add 0.02mol of allyl chloride, 0.31g of sodium sulfite, 0.62g of copper chloride and 62g of ethanol to the above-mentioned reactor, stir and heat under reflux for 12h, filter, and distill the filtrate under reduced pressure to obtain a viscous intermediate, add ethyl acetate Ester 31g, heated to dissolve, filtered, the filtrate was cooled to below 10 ℃, and crystals were precipitated;

[0040] (3) The above crystals, 0.004mol of 3-[(3-acrylamidopropyl)dimethylammonium] propionate, 37.2g of water, TX-100.31g and MS-10.31g were added to the reactor, and the mixture was stirred evenly. Continue to stir, at the same time add 1.24g of 10% sodium persulfate solution dropwise, after the dropwise addition, heat up to 50°C, keep the temperature for 2h, add 0....

Embodiment 2

[0043](1) in the reactor, add 0.02mol of sodium benzaldehyde-2,4-disulfonate, 0.026mol of sodium cyanoborohydride, 0.026mol of dimethylamine, 62g of methanol successively, heated to reflux for 8h, evaporated to dryness;

[0044] (2) Add allyl chloride 0.026mol, sodium sulfite 0.62g, copper chloride 1.24g and ethanol 124g in the above-mentioned reactor, stir and heat under reflux for 24h, filter, and distill the filtrate under reduced pressure to obtain a viscous intermediate, add ethyl acetate Ester 49.6g, heated to dissolve, filtered, the filtrate was cooled to below 10°C, and crystals were precipitated;

[0045] (3) The above crystals, 0.01mol of 3-[(3-acrylamidopropyl)dimethylammonium]propionate, 62g of water, TX-100.62g, and 10.62g of MS-10.62g were added to the reactor, stirred evenly, and continued Stir, at the same time, add 3.1 g of 10% sodium persulfate solution dropwise. After the dropwise addition, the temperature is raised to 52 °C, and the temperature is kept for ...

Embodiment 3

[0048] (1) successively add 0.02mol of sodium benzaldehyde-2,4-disulfonate, 0.022mol of sodium cyanoborohydride, 0.022mol of dimethylamine, 38g of methanol in the reactor, heat under reflux for 6h, evaporate to dryness;

[0049] (2) 0.022mol of allyl chloride, 0.44g of sodium sulfite, 0.88g of copper chloride and 89g of ethanol were added to the above-mentioned reactor, stirred and heated to reflux for 16h, filtered, and the filtrate was distilled under reduced pressure to obtain a viscous intermediate, and ethyl acetate was added. Ester 34g, heated to dissolve, filtered, the filtrate was cooled to below 10°C, and crystals were precipitated;

[0050] (3) The above crystal, 0.006mol of 3-[(3-acrylamidopropyl)dimethylammonium]propionate, 42g of water, TX-100.44g, and 10.45g of MS-10.45g were added to the reactor, stirred evenly, and continued While stirring, 1.81g of 10% potassium persulfate solution was added dropwise at the same time. After the addition was completed, the temp...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to an anti-swelling clay stabilizer and a preparation method thereof. The preparation method comprises the following steps: sequentially adding benzaldehyde-2, 4-sodium disulfonate, sodium cyanoborohydride, dimethylamine and methanol into a reactor, heating, refluxing, and evaporating to dryness; adding allyl chloride, sodium sulfite, copper chloride and ethanol into the reactor, stirring, heating, refluxing and filtering; adding ethyl acetate, heating for dissolving, filtering, cooling the filtrate to below 10 DEG C, and separating out crystals; adding 3-[(3-acrylamidopropyl) dimethyl ammonium] propionate, water, TX-10 and MS-1, uniformly stirring, continuously stirring, simultaneously dropwise adding 10% of an initiator solution, after dropwise adding, heating to 50-55 DEG C, keeping the temperature for 2-3 hours, adding sodium sulfite, stirring for 0.5-1 hour, adding potassium chloride and ammonium sulfate, and stirring for dissolving to obtain the clay stabilizer. The clay stabilizer has the advantages of high anti-swelling rate, high temperature resistance and washing resistance.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and relates to a clay stabilizer for water injection and a preparation method thereof, in particular to an anti-sunking clay stabilizer and a preparation method thereof. Background technique [0002] With the continuous development of oil fields, more and more attention has been paid to the protection technology of reservoirs. Clay minerals widely exist in oil reservoirs. If the mining measures are improper, it will cause clay minerals to expand, disperse and migrate, leading to permeability. rate decreases and damages the reservoir. [0003] According to the water-sensitivity damage mechanism of clay minerals, if some additives are added to the injected water to isolate the attraction of water molecules by the dipoles of the oxygen bonds or ammonia-oxygen bonds of the clay crystal layer, it will prevent the hydration and swelling of the clay. At the same time, the inter-ionic repu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/02C08F220/60C09K8/584
CPCC08F226/02C08F220/603C09K8/584C09K2208/12
Inventor 王卫信周建华任洪帅李长伟寇俊风
Owner SHOUGUANG XINHAI ENERGY TECH CO LTD
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