A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
投稿时间:2018-09-04  
英文关键词:Fracturing, Salt-induced viscosifying, Thermoviscosifying, Smart polymer, Rheological properties
基金项目:The authors would like to thank the financial support from State Energy Center for Shale Oil Research and Development (Grant No. G5800-17-ZS-KFNY008).
作者单位
Xian’e Li State Energy Center for Shale Oil Research and Development, Beijing 100083, People’s Republic of China
Polymer Research Institute, Sichuan University, Chengdu 610065, People’s Republic of China 
Hong-Yao Yin State Energy Center for Shale Oil Research and Development, Beijing 100083, People’s Republic of China
Polymer Research Institute, Sichuan University, Chengdu 610065, People’s Republic of China 
Ru-Sheng Zhang State Energy Center for Shale Oil Research and Development, Beijing 100083, People’s Republic of China
Petroleum Exploration & Production Research Institute, SINOPEC, Beijing 100083, People’s Republic of China 
Jia Cui State Energy Center for Shale Oil Research and Development, Beijing 100083, People’s Republic of China
Petroleum Exploration & Production Research Institute, SINOPEC, Beijing 100083, People’s Republic of China 
Jun-Wen Wu State Energy Center for Shale Oil Research and Development, Beijing 100083, People’s Republic of China
Petroleum Exploration & Production Research Institute, SINOPEC, Beijing 100083, People’s Republic of China 
Yu-Jun Feng State Energy Center for Shale Oil Research and Development, Beijing 100083, People’s Republic of China
Polymer Research Institute, Sichuan University, Chengdu 610065, People’s Republic of China 
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英文摘要:
      Inter-salt shale oil reservoirs located between two salt layers are always accompanied by high temperature and high salinity. However, the present commonly used water-soluble polymers in fracturing fluids suffer from poor tolerance to high temperature and high salinity. Thermoviscosifying polymers (TVP) whose aqueous solution shows viscosity increase upon increasing temperature and salt concentration have received considerable attention recently, which is promising for utilization in fracturing fluids to overcome these problems. In this work, both the salt-induced viscosifying property and mechanism of a TVP solution were investigated and the performance of TVP used as fracturing fluid based on the conditions of the Jianghan inter-salt shale oil reservoir in China was evaluated. It is found that the salt-induced viscosifying property of the TVP solution decreases with temperature and shear rate, but increases with polymer concentration. The number of intermolecular hydrophobic domains increases with the salt concentration contributing to the strengthening of a 3D network structure, which results in an increase in viscosity. In addition, the TVP fracturing fluid formulated with saturated brine exhibits excellent temperature and shear resistance, sand-suspending performance, and gel-breaking performance. Its viscosity remains above 50 mPa s after being sheared for 1 h even at a high temperature of 140 °C and the sand-suspending stability can be maintained for more than 1 week at 100 °C. Furthermore, the fracturing fluid can be easily broken down within 12 h using 0.2 wt%–0.3 wt% potassium persulfate without residue.
Xian’e Li,Hong-Yao Yin,Ru-Sheng Zhang,Jia Cui,Jun-Wen Wu,Yu-Jun Feng,2019.A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs.Petroleum Science,16(4):816~829.
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