高温压裂液体系研发及在海上气田的应用

鲍文辉 王杏尊 郭布民 彭雪飞 蔡依娜

中海油田服务股份有限公司油田生产研究院，天津 300451

Research Institute of Oilfield Production, Oilfield Service Co. Ltd., CNOOC, Tianjin 300451, China

国内常规压裂液体系仅适用于150 ℃以下地层，而海上气田高温深井的地层温度高达160 ℃。文中通过室内实验优选了温度稳定剂、高温延迟交联剂和破胶剂的加量，研制出耐温160 ℃的高温压裂液体系，延迟交联时间可控制在2～5 min，破胶时间少于3 h。该体系在海上气田HY2井158 ℃储层压裂施工中得到成功应用，压后45 h内压裂液返排率85.5%，日产气9.6×104 m3，达到了改造储层和增产的目的。该技术对海上高温储层压裂具有一定的指导意义。

At present, conventional fracturing fluid system only applies to the formation with lower than 150 ℃. The formation temperature of deep well in some offshore gas fields is up to 160 ℃. Lab experiment is conducted to optimize temperature stabilizer, delayed crosslinker for high temperature and the concentration of gel breaker and the fracturing fluid system resistant to the temperature higher than 160 ℃ is developed in this paper. The gelling time of the fracturing fluid system can be controlled at the range of 2 to 5 minutes and the gel breaking time of fracturing fluid system can be controlled less than 3 hours. This fracturing fluid system has been used successfully in the reservoir fracturing of HY2 offshore gas well with the temperature of 158 ℃. Within 45 hours after fracturing, the flow back rate of fracturing fluid attains to 85.5% with a gas production 96,000 m3/d. The reservoir is modified and the production is increased. This technology has guiding signification for high temperature reservoir fracturing in offshore fields.

10.6056/dkyqt201306029