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High-temperature resistant clay stabilizer and preparation method thereof

A clay stabilizer and high-temperature-resistant technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high-temperature resistance, salt resistance, long-term low-permeability medium and low permeability reservoirs, pore clogging, Poor anti-swelling effect and other problems, to achieve the effect of preventing hydration swelling, good effect, and strong washing resistance

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the organoclay stabilizers currently used are straight-chain type. When the molecular weight is large, it is easy to block the pores of medium and low permeability formations. When the molecular weight is small, the anti-swelling effect is poor and the validity period is short.
[0007] Although the existing clay stabilizers have the ability of temperature resistance and clay stabilization to a certain extent, they have deficiencies in high temperature resistance, salt resistance, long-term performance and use in medium and low permeability reservoirs

Method used

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  • High-temperature resistant clay stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Dissolve 42g of 2-acrylamido-2-methylpropanesulfonic acid in 58g of water, adjust the pH to about 7 with KOH, and set aside. Add 69.4g of epichlorohydrin to the reactor, control the temperature of the reactor at 20°C, add 56.3g of 40% dimethylamine aqueous solution and 50g of the prepared 2-acrylamido-2-methyl Potassium propanesulfonate solution, then add 13.5g allyltrimethylammonium chloride, 60g water, feed nitrogen into the reactor for 30min and add 1.1g of sodium bisulfite after 3min, add 2.7g of ammonium persulfate after 3min, React at a temperature of 40°C for 2 to 8 hours. During the reaction, detect the molecular weight of the product. When the molecular weight is 4216, add 4.1 g of sodium formate. After the reaction is complete, a clay stabilizer is obtained. The structural formula of the product is as follows after infrared analysis:

[0036]

[0037] In the formula, x:y:z= 5:1:1.

Embodiment 2

[0039] Dissolve 40g of acrylamide butyl sulfonic acid in 60g of water, adjust the pH to about 7 with KOH, and set aside. Add 69.4g epichlorohydrin to the reactor, the reactor temperature is controlled at 20°C, add 56.3g mass fraction of 40% dimethylamine aqueous solution and 50g of the above prepared potassium acrylamide butyl sulfonate solution, and then Add 23.4g mass fraction and be 70% dimethyl diallyl ammonium chloride aqueous solution, 65g water, feed nitrogen into the reactor for 30min, add 1.1g of sodium bisulfite after 3min, add 2.7g of ammonium persulfate after 3min , react at a temperature of 40°C for 2 to 8 hours, and detect the molecular weight of the product during the reaction. When the molecular weight is 4330, add 3.3g of sodium formate. After the reaction is completed, a clay stabilizer is obtained. Its structural formula is as follows through infrared analysis:

[0040]

[0041] In the formula, x:y:z=25:5:6.

Embodiment 3

[0043] Dissolve 22g of vinyl sulfonic acid in 40g of water, adjust the pH to about 7 with KOH, and set aside. Add 34.7g of epichlorohydrin to the reactor, control the temperature of the reactor at 20°C, add 28.2g of dimethylamine aqueous solution with a mass fraction of 40% and 31g of the above prepared potassium vinylsulfonate solution, and then add 31.5 The g mass fraction is 60% diethyldiallyl ammonium chloride aqueous solution, 24 g water, feeds nitrogen into the reactor after 30min and adds 0.5g of sodium bisulfite after 3min, adds 1.3g of ammonium persulfate after 3min, React at a temperature of 40°C for 2 to 8 hours. During the reaction, detect the molecular weight of the product. When the molecular weight is 5517, add 2.5 g of sodium formate. After the reaction is complete, a clay stabilizer is obtained. Its structural formula is as follows after infrared analysis:

[0044]

[0045] In the formula, x:y:z=25:9:10.

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Abstract

The invention discloses a high-temperature resistant clay stabilizer and a preparation method thereof. The preparation method comprises the following steps: carrying out initiation reaction on epoxy chloropropane, dimethylamine and unsaturated quaternary ammonium salt with a sulfonate-containing anionic monomer under a certain condition; and then adding a chain transfer agent in the reaction process to control the molecular weight and after reaction, obtaining the clay stabilizer, wherein both the main and side chains contain cations and the side chain further contains anions. The clay stabilizer has the abilities of resisting temperature, preventing salt and resisting pollution; the clay stabilizer is small in use level, scouring resistant and good in anti-swelling effect; and the molecular weight is ranged from 1500 to 6000, so that the high-temperature resistant clay stabilizer is suitable for a low permeability reservoir.

Description

technical field [0001] The invention relates to a high temperature resistant clay stabilizer and a preparation method thereof. Background technique [0002] The formation contains a certain amount of clay minerals, mainly kaolinite, montmorillonite, illite and chlorite, etc., when these clays encounter external water or water-based substances during oilfield development (water injection, acidification, fracturing) Swelling, dispersion, migration, and plugging of pore channels will occur, resulting in a decrease in formation permeability, and more serious damage to low-permeability reservoirs. In order to reduce the damage to the reservoir, clay stabilizers are often added in oilfields to improve the hydration expansion and dispersion migration of clay. [0003] According to different chemical structures, clay stabilizers can be divided into: inorganic salts, inorganic multi-core polymers, and organic polymers. [0004] Inorganic salt clay stabilizers are cheap and have a g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F226/02C08F220/58C08F228/02C08F4/40C09K8/575
Inventor 封心领袁俊秀王康逯贵广
Owner CHINA PETROLEUM & CHEM CORP
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