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Hydrophobically-associating polyacrylamide fracturing fluid thickener, preparation method and applications thereof

A polyacrylamide, hydrophobic association technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient temperature resistance, instability, incomplete gel breaking, etc.

Active Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the polyacrylamide polymer fracturing fluid thickeners in the prior art have insufficient temperature resistance, incomplete gel breaking, and instability under high temperature and high shear. A hydrophobic association polyacrylamide thickener for fracturing fluid with good high temperature resistance and shear resistance. The thickener for fracturing fluid can maintain stable performance under high temperature and high shear, and at the same time avoid There are problems such as residues and incomplete gel breaking in the fracturing fluid that cause serious damage to the formation, so that it can be used as a fracturing fluid in oil field fracturing

Method used

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  • Hydrophobically-associating polyacrylamide fracturing fluid thickener, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Dissolve 46g of acrylamide monomer, 32g of AMPS, 1g of sodium acrylamide octadecylsulfonate, and 0.1g of sodium formate in 150g of water to make a mixed aqueous solution, adjust the pH value between 7-12, add it to the reaction kettle, and pass Nitrogen deoxygenation, stirring at the same time, water bath temperature control at 15-25 ℃, continuous nitrogen deoxygenation 30min. Dissolve 0.002g of potassium persulfate, 0.0012g of sodium bisulfite, and 0.0008g of azobisisobutyl ether hydrochloride in 2g of water respectively, and add them dropwise into the reactor, and continue to blow nitrogen and stir. After the viscosity of the polymerization reaction system increases significantly, stop feeding nitrogen after the polymerization reaction starts, and the temperature of the water bath gradually increases with the temperature of the reaction system. When the temperature of the reaction system rises to the highest temperature, control the external circulation temperature of t...

Embodiment 2

[0044] Dissolve 62g of acrylamide monomer, 16g of dimethyl diallyl ammonium chloride, 0.8g of sodium octadecyl acrylamide, 0.004g of dimethylaminoethyl methacrylate, and 0.1g of sodium formate in 150g of water , to prepare a mixed aqueous solution, adjust the pH value between 7-12, add it to the reaction kettle, pass nitrogen gas to remove oxygen, and stir at the same time, control the temperature of the water bath at 15-25 ° C, and continue to pass nitrogen gas to remove oxygen for 30 minutes. Dissolve 0.002g of potassium persulfate, 0.0012g of sodium bisulfite, and 0.0008g of azobisisobutyl ether hydrochloride in 2g of water respectively, and add them dropwise into the reactor, and continue to blow nitrogen and stir. After the viscosity of the polymerization reaction system increases significantly, stop feeding nitrogen after the polymerization reaction starts, and the temperature of the water bath gradually increases with the temperature of the reaction system. When the temp...

Embodiment 3

[0047] Dissolve 54g of acrylamide monomer, 24g of AMPS, 0.01g of vinylpyrrolidone, 0.8g of sodium acrylamide hexadecylsulfonate, 0.1g of sodium formate, and 0.006g of dimethylaminoethyl methacrylate in 150g of water, and prepare a mixture Aqueous solution, adjust the pH value between 7-12, add it to the reaction kettle, pass nitrogen gas to deoxygenate, stir at the same time, control the temperature of the water bath at 15-25 °C, and continue to pass nitrogen gas to deoxygenate for 30 minutes. Dissolve 0.004g of potassium persulfate, 0.0016g of sodium bisulfite, 0.002g of tetramethylethylenediamine, and 0.0008g of azobisisobutyl ether hydrochloride in 2g of water, drop them into the reaction kettle, and continue to blow nitrogen and stir. After the viscosity of the polymerization reaction system increases significantly, stop feeding nitrogen after the polymerization reaction starts, and the temperature of the water bath gradually increases with the temperature of the reaction ...

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Abstract

The present invention relates to a hydrophobically-associating polyacrylamide fracturing fluid thickener, a preparation method and applications thereof. In the prior art, the polyacrylamide polymer fracturing fluid thickener has disadvantages of insufficient temperature resistance, incomplete gel breaking and instability at high temperature and high shearing. A purpose of the present invention is mainly to solve the problems in the prior art. The hydrophobically-associating polyacrylamide fracturing fluid thickener is prepared by carrying out a reaction on a reaction system comprising components of 15-50 parts by weight of acrylamide, 1-50 parts by weight of a cationic monomer or anionic monomer, 1-20 parts by weight of a nonionic monomer, 0.01-0.5 part by weight of a hydrophobic monomer, 0.001-0.005 part by weight of a molecular weight regulator, 0.0001-0.0005 part by weight of a composite initiator, and 30-80 parts by weight of water. With the technical scheme, the problems in the prior art are well solved. According to the present invention, the hydrophobically-associating polyacrylamide fracturing fluid thickener can be separately applied in the oil and gas field fracturing process, or can be compounded with other auxiliary agents so as to be adopted as the fracturing fluid thickener applied in the oil and gas field fracturing process.

Description

technical field [0001] The invention relates to a synthetic acrylamide polymer, in particular to a hydrophobic association polyacrylamide used as a thickener in tertiary oil recovery and in the fracturing process of high-temperature and high-salt oil reservoirs. Background technique [0002] As an important production stimulation measure for oil and gas reservoirs, fracturing has been developed rapidly and widely used, and fracturing has significantly increased the efficiency of oilfields. Taking Well Wei 11-53 in Zhongyuan Oilfield as an example, fracturing was carried out in July 2004, and the accumulative increase in oil production in that year was 663 tons , The daily oil increase is 4.42t, based on crude oil of 75 US dollars / barrel, the daily income is about 16,575 yuan, and the increased income of the year is about 2.5 million. [0003] Fracturing fluid is an important part of fracturing technology. Natural polymers such as guar gum have always been widely used materi...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F226/02C08F220/34C08F226/10C08F4/40C09K8/68
Inventor 苏智青夏燕敏于志省蔡红许汇宋晓芳王兰朱益兴
Owner CHINA PETROLEUM & CHEM CORP
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