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《Science Technology and Engineering》 2012-25
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Risk Control of Deep-well Well Blowout Considering Wellbore Temperature Field and Pressure Field

LI Qian-deng1,WANG Ting-chun1,WANG Xiu-xiang1,LIU Yong-wang2,WU Rui-qing1(HSE Department in SINOPEC Research Institute of Safety Engineering1,Qingdao 266071,P.R.China; College of Petroleum Engineering in China University of Petroleum2,Qingdao 266580,P.R.China)  
The range of wellbore temperature and pressure field is great for deep and ultra deep wells,it will have a significant impact on drilling fluid density field and then well control security.Develop a wellbore temperature field model,the drilling fluid density distribution is calculated when it is circulate and still,and then the influence of wellbore temperature and pressure field on well control process is discussed.Research shows:in the process of deep and ultra deep wells control,wellbore temperature and pressure field variation should be considered.When drilling fluid is circulating and still,the actual equivalent circulating density and equivalent static density is lower than as a ground constant,drilling fluid density should be enlarged to balance formation pore pressure,and some measures should be taken to prevent decrease of downhole annular pressure which may result in overflow,kicks and even blowout.When wellbore structure is designed,the influence of wellbore temperature and pressure field can be ignored.Prevention of well control accidents needs not only technologies but also management measures.
【CateGory Index】: TE28
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