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Emerging the dual string drilling and dual coil tubing drilling technology in a geothermal well applications

Petroleum 2022年第1期8卷 102-109页

作者： Jainish Shingala nikshit vora Manan Shah School of Petroleum Technology Pandit Deendayal Energy UniversityGandhinagar382426India Department of Chemical Engineering School of TechnologyPandit Deendayal Energy UniversityGandhinagar382426India

The challenges found in geothermal well drilling have forced the industry to develop new significant cost effective,time saver technologies to go for deeper geothermal resources beyond their traditional limits.To overcome these challenges,the new Dual String Drilling(DSD)technology which is based on penetration pathway of drilling fluid and rock cuttings during drilling a well.The principle of DSD employs drilling fluid flows through the annulus of inner and outer string pipe while cutting from the bottom of the well through inner pipe.The paper describes the novel Dual String Drilling(DSD)technology,predicting their occurrence and advantages on drilling of geothermal well.The outcome shows that with DSD approach a lot of time will be saved to circulate the kick out of the well.Additionally,the characteristic response of DSD enables to improve the hole cleaning capacity,to prevent pipe stuck,better well stability,reduction in torque and drag,to remove the dynamic equivalent circulating density gradient in geothermal wells.Moreover,the paper also depicts the system and method for dual coil tubing drilling of horizontal well which follows the same principle as DSD.The comparison of DSD with conventional drilling assesses that the DSD technology is affordable and appropriate for geothermal well drilling.

关键词： Dual string drilling Geothermal energy Kick detection

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