Development and evaluation of high temperature resistant cross-linked acid fracturing fluid system

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Abstract In view of the problems of high cost, poor temperature resistance (less than 160 ℃) and incompletely broken of viscoelastic surfactant system(VES) and existing gelling acid, the thickener and organic zirconium crosslinking agent were synthesized by aqueous solution polymerization at first. In this paper, the thickener was then cross-linked by an organic zirconium crosslinker in a 20% HCl solution, a high temperature resistant crosslinking acid base solution was obtained. Based on this, according to the performance requirements of fracturing fluid, a kind of cross-linked acid fracturing fluid resistant to 180 ℃ was developed by adding high-temperature corrosion inhibitor, drainage aid, iron ion stabilizer and clay stabilizer. The high temperature and high pressure remoter, fracturing fluid friction tester and surface interfacial tension tester were used to evaluate the performance of cross-linked acid fracturing fluid. The results show that the viscosity of the cross-linked acid fracturing fluid can be maintained as 73 mPa·s after shearing at 180 ℃ and 170 s^-1 for 120 min. When 0.15% ammonium persulfate was added to break the glue, the viscosity decreased to 3.2 mPa·s, showing a good temperature resistance and glue breaking performance.

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	JIANG Qihui
	YANG Xiangtong
	GONG Fuzhong

Keywords： fracturing fluid； crosslinked acid； thickener； high-temperature resistance

Received 2021-07-08;

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JIANG Qihui, YANG Xiangtong, GONG Fuzhong.Development and evaluation of high temperature resistant cross-linked acid fracturing fluid system[J] Chemcial Industry and Engineering, 2022,V39(1): 51-57

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