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《Natural Gas Industry》 2012-07
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A method of wellbore pressure profile calculation for foam drilling in ultra-high temperature geothermal wells at Olkari,Kenya

Wang Wenyong1,2,Long Junxi1,Liu Bowei1,Li Gao1,Meng Yingfeng1(1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation∥ Southwest Petroleum University,Chengdu,Sichuan 610500,China;2.Overseas Project Department of CNPC Great Wall Drilling Company,Beijing 100101,China)  
Foam drilling is often used in Olkari,Kenya,where the formation temperature of geothermal wells is 350 ℃.However,the low pressure and ultra-high temperature may lead to phase change in foam fluids.And there is no method available now to calculate the wellbore pressure profile when phase change occurs in the hole.In this paper,the p-T phase diagram of foam drilling fluids is drawn out by use of the fluid PVT analyzer,and the drilling fluid phase change law is presented herein.And then based on the existing fluid flow model of underbalanced drilling,a set of drilling parameter calculation model is set up for drilling conditions with phase change.In combination with an Olkari geothermal well's temperature and pressure data,the fluid flow parameters in this well are calculated,and the phase distribution regularities in that wellbore are also obtained.Through the calculation of the wellbore fluid pressures,the working conditions of the working fluid can be accurately known,thereby to provide a theoretical support for the prevention of downhole accidents.
【Fund】: 国家自然科学基金重点项目“气体钻井技术基础研究”(编号:51134004)的研究成果
【CateGory Index】: P634;P314
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