摘要
随着深水和超深水油气资源的开发,钻井过程中出现的漏失问题日益复杂,尤其在双漏层的情况下缺乏漏层的定位理论。在立压变化法确定单漏层位置的基础上,考虑钻具组合对循环压耗的影响,构建了双漏层漏失层位的计算模型,适用于井漏失返(钻井液可回流)和井漏未失返(钻井液无法回流)两种工况。通过参数敏感性分析,揭示了漏失量、钻井液密度、立压降低值等因素对漏层深度的影响规律,重点阐述了双漏层之间漏失流量分配系数的变化对深度差的影响规律。模拟结果表明,漏失量与漏层深度呈反比,钻井液密度也与漏层深度呈反比,而立压降低值则与漏层深度呈正比。随着漏失流量分配系数增大,双漏层的深度差先减小后增大,当分配系数为0.5时深度差最小。本文所建模型能快速准确定位双漏层深度,可为深水超深水钻井安全提供参考。
As the development of deepwater and ultra-deepwater oil and gas resources progresses,the leakage problem encountered during drilling operations is becoming increasingly complex,especially in the presence of dual leakage layers.Currently,there is still a lack of a theoretical foundation for positioning of dual leakage layers.Therefore,considering the impact of drill string assemblies on circulating pressure loss,this paper develops a positioning model for dual leakage layers on the basis of position determination of single leakage layers by the standpipe pressure variation method.The proposed model is applicable to both scenarios in which the drilling fluid can or cannot flow back.Through sensitivity analysis of various parameters,the paper reveals the influence of factors such as leakage volume,drilling fluid density,and standpipe pressure reduction on the leakage layer depth.It specifically examines the effect of changes in the leakage distribution coefficient between dual leakage layers on their depth difference.The simulation results show that the leakage volume and the drilling fluid density are inversely proportional to the leakage layer depth,while the standpipe pressure reduction is directly proportional to the leakage layer depth.As the leakage distribution coefficient increases,the depth difference between the dual leakage layers initially decreases and then increases,reaching a minimum when the coefficient is 0.5.This model enables quick and accurate depth determination of dual leakage layers,which is of reference value for deepwater and ultra-deepwater drilling safety.
作者
冯凯
刘书杰
殷志明
徐一龙
任美鹏
田得强
尹邦堂
FENG Kai;LIU Shujie;YIN Zhiming;XU Yilong;REN Meipeng;TIAN Deqiang;YIN Bangtang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;CNOOC China Limited,Hainan Branch,Haikou,Hainan 570312,China;CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《中国海上油气》
北大核心
2025年第2期231-239,共9页
China Offshore Oil and Gas
基金
国家重点研发计划课题(编号:2022YFC2806504)
国家自然科学基金面上项目“水平井压回法压井气液逆向非稳态多相流动机理及参数设计方法(编号:52274020)”
国家自然科学基金基础科学中心项目“超深特深层油气钻采流动调控(编号:52288101)”部分研究成果
国家自然基金联合基金项目“深水控压钻完井地层-井筒多场耦合机理与压力调控(编号:U21B2069)”。
关键词
双漏层
漏层位置计算
立压变化法
漏层深度变化规律
深水超深水
dual leakage layers
calculation of leakage layer location
standpipe pressure variation method
law of leakage layer depth variation
deepwater and ultra-deepwater
