气举反循环钻进工艺在贵州地热井中的推广应用

Popularization and application of air-lift reverse circulation drilling technology in Guizhou geothermal deep wells

摘要:

结合贵州省地热钻井设备及井身结构等情况，就气举反循环钻进工艺在地热井施工中的应用，对冲洗液正循环和气举反循环两种钻进工艺原理、设备配套、钻具组合、沉没比、钻进参数等进行了分析和总结。气举反循环钻进工艺在地热井施工中的应用效果，证明了该工艺能够提高溶蚀裂隙地层施工效率，减少孔内事故的发生，同时该工艺在热储层中应用还具有明显的洗井效果。

Abstract:

In the context of geothermal drilling equipment and well structures in Guizhou Province, the application of air-lift reverse circulation drilling technology in geothermal well drilling is summarized, including the direct mud circulation and air-lift reverse circulation principles, drilling equipment, BHA, immersion ratio, drilling parameters and so on. The field results of air-lift reverse circulation drilling technology in geothermal well drilling proved that it can improve the drilling efficiency in dissolved fractured formation, reduce incidents down the holes. At the same time, this technology provides good borehole cleaning in thermal reservoirs.