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| Cross-linking and temperature resistance property of alcohol-containing fracturing fluid |
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FAN Haiming1, YANG Hang1, LI Lingyu1, WEI Zhiyi1, ZHANG Suiwang2, ZHANG Jinze1, LIU Songda1, YANG Hongbin1
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(1.Shandong Key Laboratory of Oilfield Chemistry, College of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.Oil and Gas Technology Research Institute, Changqing Oilfield Company, Xi 'an 710018, China)
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| Abstract: |
| The solubility of guar gum(GG),hydroxypropyl guar gum(HPG) and carboxymethyl hydroxypropyl guar gum(CMHPG) in alcohol/water mixed solvents with different ethanol volume fractions were investigated. Alcohol-containing fracturing fluid was prepared with sodium tetraborate as crosslinking agent. The change of cross-linking performance and temperature resistance property with ethanol content were analyzed. It is found that GG, HPG and CMHPG can be fully dissolved when the ethanol volume fraction is 10%, 50% and 60%, respectively. After adding crosslinking agent sodium tetraborate, alcohol-containing crosslinked fracturing fluid can be formed when the ethanol content does not exceed 30% and 50% for HPG and CMHPM, respectively. Because ethanol has the dual functions of inhibiting molecular chain degradation and enhancing the cross-linking degree, alcohol-containing crosslinked fracturing fluid has stronger temperature resistance than water-based fracturing fluid. |
| Key words: alcohol-containing fracturing fluid modified guar gum cross-linking temperature resistance property |
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