| Experimental research on a new encapsulated heat-generating hydraulic fracturing fluid system |
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| 作者姓名： | 吴金桥 张宁生 吴新民 刘晓娟 |
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| 作者单位： | School of Energy and Power Engineering Xi’an Jiaotong University，School of Petroleum Engineering Xi’an Shiyou University，School of Petroleum Engineering Xi’an Shiyou University，School of Petroleum Engineering Xi’an Shiyou University，Xi’an 710049 China Xi’an 710065 China Xi’an 710065 China Xi’an 710065 China |
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| 基金项目： | This work was supported by CNPC Innovation Foundation （No. 2001CX-19）. |
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| 摘 要： | 1 IntroductionFracturing plays an important role in increasingthe production and injection and enhancing the final re-covery of oil and gas. At present, the use of ahydroxypropyl guar gum, borate-crosslinked, hydraulicfracturing fluid systemhas become ext…
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| 关 键 词： | 水力压裂 流动性 压缩方式 兼容性 凝胶体 天然气 石油 |
Experimental research on a new encapsulated heat-generating hydraulic fracturing fluid system |
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| Jinqiao Wu,Ningsheng Zhang,Xinmin Wu,Xiaojuan Liu.Experimental research on a new encapsulated heat-generating hydraulic fracturing fluid system[J].Chinese Journal of Geochemistry,2006,25(2):162-166. |
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| Authors: | Jinqiao Wu Ningsheng Zhang Xinmin Wu Xiaojuan Liu |
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| Institution: | (1) School of Energy and Power Engineering, Xi’ an Jiaotong University, 710049 Xi’an, China;(2) School of Petroleum Engineering, Xi’ an Shiyou University, 710065 Xi’an, China |
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| Abstract: | During fracturing treatment for low-temperature, shallow and high freezing point oil reservoirs, the first-line problems are to overcome uncompleted breakdown, uncompleted cleanup of fracturing fluids and cold damages to the formations by injecting cold fluid. To avoid those problems, it is suggested to adopt a new encapsulated heat-generating hydraulic fracturing fluid system as described in this paper.Firstly, two kinds of chemical heat-generating systems were studied and the NH4Cl-NaNO2 system was selected. According to the reaction characteristics of the system, oxalic acid was chosen as a catalyst of reaction and encapsulated using ethyl cellulose and paraffin as coating materials by the phase separation method. Compatibility of NH4Cl-NaNO2-encapsulated oxalic acid with hydroxypropyl-guar fracturing fluid was also discussed in the paper. The results showed that the hydraulic fracturing fluid containing encapsulated heat-generating agents hare a good stability and compatibility. When the fracturing fluid contains 2.0 mol·L-1 NH4Cl-NaNO2, 0.93％ encapsulated oxalic acid and 0.08％ ammonium persulfate, the peak temperature can reach 78.0℃ and the viscosity of residual liquid is 3.12 mPa·s after 4 hours. |
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| Keywords: | hydraulic fracturing fluid encapsulated chemical heat-generating agent compatibility gel breaking |
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