钻探工程2024，Vol.51Issue(1)：58-67,10.DOI:10.12143/j.ztgc.2024.01.008
海上窄压力窗口控压固井浆柱结构设计方法
Design method of slurry column structure of managed pressure cementing at offshore gas wells with narrow pressure window
摘要
Abstract
Aiming at the technical problem of poor cementing quality of offshore gas wells with narrow pressure window,the goal of safe and efficient cementing is achieved through the application of light drilling fluid to optimize the slurry column structure and the application of annular backpressure.Three key technical requirements are considered in this paper:the annular backpressure value during the pump stopping process should not exceed 5MPa,the turbulent contact time of the flushing fluid should be greater than 10 minutes,and the wellbore should be self-stable after cementing ending.Then the optimized slurry column structure and the calculated wellbore equivalent cycle density(ECD)with managed pressure cementing(MPC)technology were conducted by which a design method of cementing slurry column structure of MPC for offshore gas wells with narrow pressure window was formed.Taking a high-temperature and high-pressure well in Ledong 10-1 Gas Field as an example,the cementing slurry column structure was optimized,and the wellbore ECD and turbulent contact time was simulated during the entire MPC process.The results indicate that:the requirements of turbulent contact time greater than 10 minutes and leakproof pressure stability can be achieved under the following three conditions:the volume of light drilling fluid is 14～50m3 and the density is 1.822～2.142g/cm3,the volume of the pad fluid is greater than 13m3 and the density is 2.36～2.45g/cm3 and the density of cement slurry is 2.4～2.51g/cm3.The goal of improving the efficiency of cementing displacement and safety construction is feasible with this method.关键词
海上油气井/窄压力窗口/控压固井/浆柱结构/回压补偿/紊流接触时间Key words
offshore oil and gas wells/narrow pressure window/managed pressure cementing(MPC)/slurry column structure/back pressure compensation/turbulent contact time分类
地质学引用本文复制引用
肖伟,罗宇维,赵军,黄志强,石礼岗,温达洋,杨焕强,梅云涛..海上窄压力窗口控压固井浆柱结构设计方法[J].钻探工程,2024,51(1):58-67,10.基金项目
中海油田服务股份有限公司项目"海上精细控压固井系统研究"(编号G2117A0521G272) （编号G2117A0521G272）
