气举反循环与正循环钻掘工艺在深部地热井施工中的应用

The Application of Air-lift Reverse Circulation and Positive Circulation Drilling Technology in Deep Geothermal Well Construction

在钻孔遇漏失量大、不稳定地层时,采用气举反循环钻进工艺,可解决正循环钻进无法施工的难题。利用气举反循环工艺洗井相比传统活塞式洗井工艺,具有效率高、事故少、施工成本低和施工质量好等优势。文中通过气举反循环工艺原理,在不下抽水泵的情况下实现了超深井孔底抽水的目的。正、反循环钻进技术联合使用,是优质、高效开发深部地热井和地下水资源的有效方法。

The use of gas lift reverse circulation drilling technology can solve the problem of inability to carry out normal circulation drilling when encountering large leakage and unstable formations during drlling.The use of gas lift reverse circulation technology for well washing has advantages over traditional piston type well washing technology,such as high efficiency,fewer accidents,low construction cost,and high construction quality.By using the principle of gas lift reverse circulation technology,the goal of pumping water from the bottom of ultra deep wells was achieved in this project without using a pumping pump.The combined use of forward and reverse circulation drilling technology is an effective method for high-quality and efficient development of deep geothermal wells and groundwater resources.