J63-5H大位移井套管下入关键技术  

Key technologies for casing running in extended-reach wells:An example from J63-5H well

作　　者：王纯全 刘世彬 石庆 鲜明 袁吉祥 李墨雨 WANG Chunquan;LIU Shibin;SHI Qing;XIAN Ming;YUAN Jixiang;and LI Moyu(Downhole Service Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan 610052,China;National Energy Shale Gas R&D(Experiment)Center,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油川庆钻探工程有限公司井下作业公司,四川成都610052 [2]国家能源页岩气研发(实验)中心,四川成都610051

出　　处：《天然气勘探与开发》2024年第5期48-54,共7页Natural Gas Exploration and Development

基　　金：中国石油川庆钻探公司项目(编号:CQ2021B-17-4-3、CQ2024B-9-Z3-3)。

摘　　要：我国致密气资源潜力可观,开发前景广阔。四川盆地中部地区八角场气田先后开发了不同层位的多个致密气藏,其中侏罗系沙溪庙组致密气藏是八角场气田致密气产量的主要贡献者,该气藏储层薄、砂体小,适用大位移井开发。由于大位移井的井眼轨迹复杂、垂深浅、钻进中存在岩屑床等因素,导致在完井过程中时常发生套管下不到位、被迫就地固井的情况,浪费了水平段,制约了致密气藏的开发效果。为此开展套管下入的关键技术研究与现场应用试验。以J63-5H井为例,该井是八角场沙溪庙组致密气藏的一口大位移井,同时也是八角场构造定向井中水垂比最大的一口井,本次基于对J63-5H井套管下入难点的分析,研究套管下入过程中的关键技术及其参数的计算方法,研究结果表明:(1)通井评价技术:通过同时评估加权刚度系数和等效刚度系数,判断通井钻具组合的相容性,既保证刚度要求,又能顺利通井。(2)井眼清洁技术:计算岩屑保持悬浮所需钻井液流速,采用稠浆+稀稠组合浆+重稠浆等携砂措施,通过循环时的环空ECD(Equivalent Circulating Density,当量循环密度)变化,以及返出岩屑量与岩屑尺寸来判断井眼是否存在岩屑床,消除岩屑床阻碍风险。(3)套管下入摩阻系数反演预测:基于短起下钻的大钩载荷,采用三维软杆模型进行反演,计算得到直井段、造斜段、水平井段的摩阻系数,摩阻系数预测结果相对准确。(4)漂浮下套管技术:漂浮下套管比常规下套管的摩阻小,更利于套管下入到位;漂浮接箍采用半球罩式玻璃盲板;施工前模拟分析漂浮接箍的最佳位置深度等参数。研究成果最终形成了自主开发的套管下入模拟分析软件,运用该软件指导套管顺利下入到位,J63-5H大位移井用时30.83h下套管至5447m,预测参数与实测参数误差小,模拟分析准确有效,辅助完成固井施工中的关键一步,�China boasts considerable tight gas resources with a broad development prospect.Many of these reservoirs with various targets have been exploited one after another in Bajiaochang gasfield,central Sichuan Basin.Among them,the reservoirs of the Jurassic Shaximiao Formation are the major contributor to field output.They are characterized by thin thickness and mini sandbody,and can be preferentially by extended-reach drilling.However,some features in such extended-reach wells,for instance complicated wellbore trajectory,small vertical depth and presence of cutting bed,often result in inadequate casing setting or forced in-situ cementing,thereby making horizontal section ineffective and restricting the recovery.It is necessary to investigate the key technologies for casing running and evaluate them by tests.Targeted Shaximiao reservoirs,J63-5H as an extended-reach well in this field is also a directional well with the largest ratio of horizontal displacement to vertical depth in Bajiaochang structure.In addition,after analyzing challenges for the running in this well,the key running technologies and the methods to calculate relevant parameters were discussed.These technologies include drifting,wellbore cleaning,inversion prediction on casing friction coefficients,and floating casing running.For drifting technology,both weighted and equivalent stiffness coefficients are evaluated to judge whether drifting assembly is compatible,so as to ensure both required stiffness and smooth drifting.For cleaning technology,the drilling-fluid flow velocity needed for keeping cuttings suspended is determined,the sand-carrying measures such as heavy drilling fluid,light+heavy drilling fluid,and extremely heavy drilling fluid are adopted,and the presence of cutting bed in wellbore is diagnosed on the basis of variations on equivalent circulating density(ECD)in annulus and the volume and size of cuttings returned,in order to eliminate blocking risks by this bed.For inversion prediction,based on the hook load in short trip,the inversion

关 键 词：固井 大位移井 通井 携砂 软件模拟 漂浮 当量循环密度 

分 类 号：TE256[石油与天然气工程—油气井工程]