深层裂缝性气藏流固耦合下钻井液漏失规律数值研究  

Numerical Study on Drilling Fluid Lost Circulation under Fluid-Solid Coupling in Deep Fractured Gas Reservoir

作　　者：王志远[1] 刘徽 孙宝江[1] 刘洪涛 娄文强 WANG Zhiyuan;LIU Hui;SUN Baojiang;LIU Hongtao;LOU Wenqiang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,China;CNPC Engineering Technology R&D Company Limited,Beijing,102206,China;PetroChina Coalbed Methane Company Limited,Beijing,102299,China;School of Petroleum Engineering,Yangtze University,Wuhan,Hubei,430100,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油集团工程技术研究院有限公司,北京102206 [3]中石油煤层气有限责任公司,北京102299 [4]长江大学石油工程学院,湖北武汉430100

出　　处：《石油钻探技术》2025年第2期52-61,共10页Petroleum Drilling Techniques

基　　金：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);国家自然科学基金重点项目“超深气井生产管柱泄漏精准识别与压力管控”(编号:52434002);山东省重大科技创新工程项目“深水复杂钻井多相流动模拟关键技术与监测装备”(编号:2022CXGC020407)联合资助。

摘　　要：钻进裂缝性地层的过程中井漏问题严峻,易导致产能降低和钻井安全事故。为此,综合考虑钻井液与天然气的物性差异、基质与裂缝间的耦合流动及裂缝开度的动态演化规律,建立了基于气液两相流动的裂缝性气藏漏失预测模型,并与试验数据进行对比,验证了模型的准确性;基于该模型,系统分析了裂缝性气藏地质构造、基质参数、裂缝参数和井底压差等因素对漏失的影响规律,修正了传统统计学漏失模型,提出了适用于裂缝性气藏的漏失速率计算方法。研究结果表明,裂缝性气藏的漏失速率随着裂缝增宽呈对数函数增长,增长趋势先急后缓,随着井底压差和裂缝长度增大呈线性增长;发育有断层裂缝性气藏的漏失速率随着裂缝宽度和井底压差增大呈指数增长,随着井眼与断层的距离增大呈对数式减小。研究结果为完善裂缝性气藏井漏规律和优选防漏堵漏技术提供了理论依据。During the drilling process in fractured formations,the issue of lost circulation is severe,which can easily lead to reduced productivity and drilling safety accidents.To address this,the differences in physical properties between drilling fluid and natural gas,coupled flow between matrix and fractures,and the dynamic evolution of fracture opening were comprehensively considered,and the lost circulation prediction model for fractured gas reservoirs with a gas and liquid two-phase flow was established.The accuracy of the model was verified by comparing it with experimental data.Based on this model,the influence of geological structure,matrix parameters,fracture parameters,and bottom-hole pressure difference on lost circulation was analyzed.Furthermore,the traditional statistical lost circulation model was refined,and a method of lost circulation rate characterization suitable for fractured gas reservoirs was provided.The results indicate that the lost circulation rate increases logarithmically with the increase in fracture width,showing a growth trend of first accelerating and then slowing down.It increases linearly with the increase in bottom-hole pressure difference and fracture length.However,for fractured gas reservoirs with developed faults,the lost circulation rate increases exponentially with the increase in fracture width and bottom-hole pressure difference and decreases logarithmically with an increase in the distance between the wellbore and fault.The research results provide a theoretical basis for improving the lost circulation law of fractured gas reservoirs and optimizing the technology of lost circulation prevention and plugging.

关 键 词：裂缝性气藏 井漏 气液两相流动 流固耦合 断层 

分 类 号：TE283[石油与天然气工程—油气井工程]