publication . Article . 2014

Technical Improvements and Application of Air-lift Reverse Circulation Drilling Technology to Ultra-deep Geothermal Well☆

Zhang Yong; Zhang Jianliang;
Open Access
  • Published: 01 Jan 2014 Journal: Procedia Engineering, volume 73, pages 243-251 (issn: 1877-7058, Copyright policy)
  • Publisher: Elsevier BV
Abstract Air-lift reverse circulation drilling technology is often used in geothermal well drilling, but there are many problems along with drilling depth increasing, such as double-wall drill pipe leaking, air-water mixer blocked, water way of bit blocked, Kelly bearing capacity insufficient, small ratio of tail pipe length and double-wall drilling pipe. These problems were thoroughly solved based on continuous technical innovation during geothermal well drilling practices. Using advanced air-lift reverse circulation drilling technology, the depth of drilled borehole was up to 4,200 meters, the deepest record in China.
free text keywords: Engineering(all), Air-lift reverse circulation, Ultra-deep geothermal well, Technical innovation, General Engineering, Petroleum engineering, Metre, Geothermal gradient, Engineering, business.industry, business, Lift (force), Well drilling, Borehole, Drill pipe, Drilling, Bearing capacity
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