内插管式气举反循环钻进工艺在基岩地热井中的应用

随着地热资源被广泛利用,地热井各种钻井技术新方法不断应用,如何提高地热井施工效率、降低地热井施工成本是地热井项目钻探施工的关键.气举反循环钻进工艺被广泛应用于地热井钻探施工中,然而在基岩浅井和中深井地热项目施工中,使用常规气举反循环钻进工艺存在钻具重量大、结构复杂、双壁密封不严等问题,对钻机提升能力要求较高,中小型钻机...

Application of Hanging Pipe Air-lift Reverse Circulation Drilling Technology in Geothermal Well Drilling

Accompanying with extensive use of geothermal resources, geothermal well drilling technology and new methods have been constantly used. How to improve the efficiency and reduce the cost of geothermal well construction is the key in geothermal well project drilling construction. Gas lift reverse circulation drilling technology is widely used in geothermal well drilling construction. However, in bedrock shallow well and medium deep well geothermal project construction, by using conventional gas lift reverse circulation drilling technology has some problems, such as heavy drilling tool, complex structure and loose double wall sealing. It requires high lifting capacity of drilling rig. Small and medium size drilling rig is difficult to meet the requirement, and the construction cost has been increased. In this study, without changing the conventional medium and small-sized drilling equipment and drilling tools, a kind of internal intubation gas lift reverse circulation drilling technology is used in the construction of Zhisheng Tangquan No.1 bedrock geothermal exploration well in Yi''nan. It is showed that the construction technology of internal intubation gas lift reverse circulation technology can realize the replacement of positive and negative circulation technology by processing some drilling tools and components without replacing the original drilling equipment and drilling tools. The replaced air lift reverse circulation drilling technology has the advantages of simple structure, light weight, reliable double wall sealing and low construction cost. It can improves the utilization rate of equipment and drilling efficiency. It is necessary to popularize the application of internal intubation gas lift reverse circulation drilling technology in bedrock shallow wells and medium deep wells.