摘要
针对增强型地热系统压裂工艺,提出了降温压裂技术,利用压裂前置液对裂缝地层进行降温。文章以一口地热井的压裂施工数据,计算分析了射孔位置温度和裂缝内压裂液温度的分布,为压裂前置液注入量的计算提供依据。计算结果表明:压裂液对井筒降温的效果显著;裂缝内压裂液温度梯度分布较大;裂缝前端50 m范围内的压裂液温降明显,可满足耐高温压裂液的温度要求。
Enhanced geothermal system（EGS） is an important method for efficient development of renewable and clean geothermal energy. However, ultra high geothermal temperature challenges the high temperature resistance of fracturing fluids. In order to improve the fracturing technology of the enhanced geothermal system, a cooling fracturing technique is proposed in this paper, which can cool the fractured formation by fracturing pre fluid. Based on the data of a fractured well in a geothermal well, the position, temperature and temperature distribution of the fracturing fluid in the fracture are calculated and analyzed, which provides a basis for the calculation of the injection volume of the fracturing fluid. The calculation results show that the fracturing fluid to the cooling effect of significant cracks within the wellbore; fracturing fluid temperature gradient is larger, the fracturing fluid temperature crack front in the range of 50 m decreased obviously, high temperature fracturing fluid can meet the temperature requirements
作者
任威严
查永进
刘明鑫
兰芳
Ren Weiyan;Zha Yongjin;Liu Mingxin;Lan Fang(Tsinghua University School of Aeronautics and Astronautics, Beijing 100084, China;CNPC Drilling Research Institute, Beijing 102206, Chnia;China University of Petroleum, Beijing 102249, Chnia;Yumen Oilfield Branch, Jiuquan 735019, Chnia)
出处
《可再生能源》
CAS
北大核心
2017年第11期1727-1731,共5页
Renewable Energy Resources
基金
科技部"863"项目(2012AA052801)
关键词
增强型地热发电系统
干热岩
降温压裂
压裂液
enhanced geothermal system（EGS）
hot dry rock
cooling fracturing
fracturing fluid
