Managed Pressure Drilling Technology:A Research on the Formation Adaptability
作者机构：Zhanjiang BranchCNOOC(China)Co.Zhanjiang524057China Zhanjiang Engineering Technology BranchCNOOC Energy Development Co.Zhanjiang524057China China University of Petroleum(East China)Qingdao266555China
出 版 物：《Fluid Dynamics & Materials Processing》 (流体力学与材料加工（英文）)
年 卷 期：2022年第18卷第6期
页 面：1865-1875页
核心收录：
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
基 金：The authors received no specific funding for this study
主 题：Deep-water drilling MPD technology ECD formation adaptability narrow pressure profile
摘 要：Existing pressure drilling technologies are based on different principles and display distinct characteristics in terms of control pressure and degree of formation *** the present study,the constant-bottomhole-pressure(CBHP)and controlled-mud-level(CML)dual gradient drilling methods are *** for the equivalent circulating density(ECD)are introduced for both drilling methods,taking into account the control pressure parameters(wellhead back pressure,displacement,mud level,etc.)and the relationship between the equivalent circulating density curve in the wellbore and two different types of pressure profiles in deep-water *** findings suggest that the main pressure control parameter for CBHP drilling is the wellhead back pressure,while for CML dual gradient drilling,it is the mud *** examples are considered(wells S1 and B2).For S1,CML dual gradient drilling only needs to adjust the ECD curve once to drill down to the target layer without *** comparison,CBHP drilling requires multiple adjustments to reach the target well depth avoiding a kick *** well B2,the CBHP method can drill down to the desired zone or even deeper after a single adjustment of the ECD *** contrast,CML dual-gradient drilling requires multiple adjustments to reach the target well depth(otherwise there is a risk of lost circulation).Therefore,CML dual-gradient drilling should be considered as a better choice for well S1,while CBHP drilling is more suitable for well B2.
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