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天然气勘探与开发 >

2024 , Vol. 47 >Issue 5: 48 - 54

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2024.05.006

致密油气

J63-5H大位移井套管下入关键技术

  • 王纯全 ,
  • 刘世彬 ,
  • 石庆 ,
  • 鲜明 ,
  • 袁吉祥 ,
  • 李墨雨
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  • 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
王纯全,男,1974年生,高级工程师;主要从事固井技术及管理工作。地址：（610052）四川省成都市成华区龙潭工业园华盛路46号。E-mail：Wangcq027@cnpc.com.cn

修回日期: 2024-07-01

  网络出版日期: 2024-11-05

基金资助

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

收起

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

  • WANG Chunquan ,
  • LIU Shibin ,
  • SHI Qing ,
  • XIAN Ming ,
  • YUAN Jixiang ,
  • LI Moyu
Expand
  • 1. Downhole Service Company, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan 610052, China;
    2. National Energy Shale Gas R&D (Experiment) Center, Chengdu, Sichuan 610051, China

Revised date: 2024-07-01

  Online published: 2024-11-05

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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30.83 h下套管至5 447 m,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,取得了良好的应用效果,为非常规气藏定向井固井中的套管下入关键技术提供了有效技术手段,助力非常规气藏的高效开发。

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

本文引用格式

王纯全 , 刘世彬 , 石庆 , 鲜明 , 袁吉祥 , 李墨雨 . J63-5H大位移井套管下入关键技术[J]. 天然气勘探与开发, 2024 , 47(5) : 48 -54 . DOI: 10.12055/gaskk.issn.1673-3177.2024.05.006

Abstract

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 is conducted using the three-dimensional soft-string model to determine the friction coefficient in the vertical, kick-off and horizontal sections, which are believed to be relatively accurate. For floating casing running, the optimal setting depth of floating collar is defined. Finally, a simulation software is developed for casing running independently. Guided by this software, casing is set successfully in J63-5H well to the depth of 5,447 m within 30.83 h. With a small error between predicted and measured parameters, the software assists to complete the critical step in cementing. It provides a valuable tool for casing running in unconventional gas reservoirs during directional-well cementing, thereby facilitating such reservoirs in the efficient development.

Key words： Cementing; Extended-reach well; Drifting; Sand-carrying; Software simulation; Floating; ECD

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