摘要
提高地热井回灌能力是实现地热资源高效可持续开发利用的先决条件。本文选取北京市通州地区蓟县系雾迷山组白云岩热储地热井(京通4号),进行酸化压裂试验前后的回灌能力对比研究。通过在酸化压裂试验前后进行抽水和回灌试验,判断酸化压裂技术对回灌能力的影响。结果表明,京通4号地热井在经过酸化压裂试验后,单位涌水量增加了约1.73倍,单位回灌量增加了约3.9倍,回灌量增加了约1.4倍,且回灌量占涌水量的比值也由压裂前的63.03%增加到压裂后的66.54%。通过进一步计算,可得出在酸化压裂试验后,单位回灌量与单位涌水量的比值为0.63。该比值与北京地区小汤山地热田蓟县系热储的实际回灌经验值对比,达到回灌经验要求的标准,证明回灌效果良好,说明酸化压裂技术增灌效果显著,值得在同类型区域内推广应用。
Improving the reinjection capacity of geothermal wells is a prerequisite for efficient and sustainable exploitation and utilization of geothermal resources.We chose a geothermal well(Jingtong-4)to conduct a comparative study on the reinjection capacity before and after acid fracturing test,which reservoirs are located at the Wumishan Formation of Jixian System.Through pumping and reinjection tests before and after acid fracturing test,we can evaluate the influence of acid fracturing technology on the reinjection capacity.The tests results show that after the acid fracturing test,the specific capacity of Jingtong-4 geothermal well increases by about 1.73 times,the specific quantity of reinjection increases by about 3.9 times,and the quantity of reinjection increases by about 1.4 times.In addition,the ratio of reinjection to water inflow increases from 63.03%to 66.54%.Through further calculation,it can be concluded that the ratio of the specific quantity of reinjection and the specific capacity is 0.63 after acid fracturing test.By comparing this ratio with the actual reinjection empirical value of the reservoirs at Jixian System in the Xiaotangshan geothermal fields,the result meets the standard of reinjection experience requirements.It proves that the acid fracturing technique has a significant effect on increasing reinjection and this technique is worth popularizing and applying in the same area.
作者
李文
孔祥军
袁利娟
高剑
沈鹏飞
冯浩
郝伟俊
何云成
LI Wen;KONG Xiangjun;YUAN Lijuan;GAO Jian;SHEN Pengfei;FENG Hao;HAO Weijun;HE Yuncheng(Beijing Geothermal Institute,Beijing 102218)
出处
《城市地质》
2019年第4期43-48,共6页
Urban Geology
基金
通州某建设新区深部地热资源勘查与示范
关键词
地热井
酸化压裂
抽水试验
回灌试验
Geothermal well
Acid fracturing test
Pumping test
Reinjection test
