测斜仪监测技术在共和盆地干热岩井压裂中的应用研究

Application of inclinometer monitoring technology in Gonghe hot dry rock well fracturing

地热是典型的非常规能源,我国具有丰富的地热资源,开发地热对缓解我国能源对外依存度不断增长的被动局面很有必要,开发利用前景广阔。测斜仪压裂监测技术可以监测裂缝发育形态,尤其在监测裂缝延伸方向,对指导井网布置、压裂工艺及施工规模方面具有重要的指导意义,目前在油气开发中获得了广泛的应用。青海共和盆地的X1井是国内干热岩首次压裂井,需要克服岩性致密坚硬、施工不确定因素多、施工排量小等监测难点问题,利用测斜仪压裂监测技术成功地监测地热井压裂改造过程,探索和丰富了地热井压裂监测方法,拓宽了测斜仪监测的应用范围,获取了X1井压裂裂缝的重要参数,为该区井网布置提供了基础数据,为测斜仪监测施工提供了重要的借鉴。

China is rich in geothermal energy,so it is necessary to develop geothermal energy to alleviate China’s increasing dependence on foreign energy;in addition,the prospect of geothermal energy development and utilization is broad.The fracturing monitoring technology with the inclinometer can monitor the development of fracture morphology,particularly the fracture extension direction,and has been widely used in oil and gas development.It plays an important role in guiding the well pattern layout,fracturing process and construction scale.The X1 well in Qinghai Gonghe Basin is difficult to monitor because of its tight and hard lithology,many construction uncertainties and small flow rate;meanwhile,X1 is the first one of geothermal wells to be fractured in China.It is the first time worldwide that inclinometer fracturing monitoring technology is used to monitor the process of HDR geothermal well fracturing treatment.The successful implementation of X1 well fracturing monitoring has explored and enriched the geothermal well fracturing monitoring methods,broadened the application scope of inclinometer monitoring.The important fracture parameters of X1 were obtained by monitoring,which provides basic data for well pattern layout in this area and an important reference example for monitoring and operation with the inclinometer.