摘要
准确了解回压改变过程中的响应时间对控压钻井的实施意义重大。以回压改变过程中的响应时间为研究对象,在刚性理论的基础上充分考虑井筒多相流动下气体流动参数沿井筒变化的实际情况,建立了回压响应时间的数学模型,分析了环空间隙、排量及套压对响应时间的影响。分析结果表明:考虑井筒气体流动参数变化后,回压响应时间明显延长;在大气侵量情况下,可适当增加井口回压,一者补偿了由于气侵造成的井底压力下降,二者井口回压的增加可以降低环空气体体积分数,缩短回压响应时间。所得结论有助于安全、高效地实现控压钻井技术。
Accurate understanding of the response time during the change of back pressure is of great significance for the implementation of MPD.Taking the response time in the process of back pressure change as the research object,based on the theory of rigidity,the actual situation of the gas flow parameter along the wellbore under the multi-phase flow of the wellbore is fully considered to establish the mathematical model of the backpressure response time.The effects of annular clearance,displacement and casing pressure on response time are analyzed.The analysis results show that the back pressure response time is obviously increased after considering the change of the gas flow parameters of the wellbore.In the case of large gas intrusion volume,the back pressure can be appropriately increased to compensate for the downhole pressure drop caused by gas intrusion,and decrease the gas volume fraction of the annular and reduce the back pressure response time.The study could help to achieve safe and efficient MPD technology.
作者
王江帅
李军
任美鹏
柳贡慧
杨宏伟
骆奎栋
Wang Jiangshuai;Li Jun;Ren Meipeng;Liu Gonghui;Yang Hongwei;Luo Kuidong(College of Petroleum Engineering,China University of Petroleum(Beijing;CNOOC Research Institute Co.,Ltd.;Beijing University of Technology)
出处
《石油机械》
北大核心
2019年第5期61-65,共5页
China Petroleum Machinery
基金
国家自然科学基金项目“深水油气钻采井筒压力控制基础研究”(51734010)、“控压钻井测控理论及关键问题研究”(51334003)
国家科技重大专项“海外重点油气田开发钻采关键技术”(2017ZX05032-004)
关键词
控压钻井
井口回压
响应时间
气侵量
环空间隙
数学模型
MPD
back pressure
response time
gas intrusion volume
annular clearance
mathematical model
