页岩气多级压裂断层动态滑移规律研究
Research on Dynamic Slip of Fault Resulted from Multistage Fracturing of Shale Gas Reservoir
刘豪 1刘怀亮 2刘宇 2曹伟 3连威 4李军5
作者信息
- 1. 中国石油大学 (北京)
- 2. 北京华美世纪国际技术有限公司
- 3. 四川宝石花鑫盛油气运营服务有限公司
- 4. 中国石油大学 (北京) 克拉玛依校区
- 5. 中国石油大学 (北京);中国石油大学 (北京) 克拉玛依校区
- 折叠
摘要
泸州页岩气区块开发过程中套管变形现象严重,而多级压裂是诱发断层滑移并导致套管变形的主要因素,但目前缺乏对断层动态滑移演化规律的研究.在分析泸州地区套管变形失效特征和相关性的基础上,考虑水力裂缝沟通并激活断层实际,建立了多级压裂条件下断层滑移动态演化数值模型.研究结果表明:多级压裂导致近井筒位置孔隙压力随压裂逐级增加,有效地应力降低;模拟时间越长、注入点流量越大,断层滑移量越大,而压裂液黏度影响断层滑移量效果弱;断层长度、断层与井筒的夹角与其滑移量关系密切,断层长度越大,断层滑移量越大;断层与井筒夹角在一定范围内越大,断层滑移量越小;水平地应力差较大的地层断层滑移会越明显.研究成果可为页岩气多级压裂过程中控制压裂施工参数提供参考.
Abstract
In the Luzhou shale gas block,severe casing deformation occurs during development,and multi-stage fracturing is the main factor inducing fault slip and causing casing deformation.However,there is currently a lack of research on the evolution of dynamic slip of fault.In this paper,based on the analysis of casing deformation and failure characteristics and correlation in Luzhou area,considering the communication and activation of faults by hydraulic fractures,a numerical model for the dynamic evolution of fault slip under multistage fracturing conditions was built.The results show that multistage fracturing leads to an increase in near-wellbore pore pressure with fractu-ring stages,resulting in a decrease in effective in-situ stress.The longer the simulation time and the larger the flow rate at injection point,the greater the fault slip is,while the fracturing fluid viscosity has weak impact on fault slip.The fault length and the angle between the fault and the wellbore are closely related to the slip:the larger the fault length,the greater the fault slip;the larger the angle between the fault and the wellbore within a certain range,the smaller the fault slip.The greater the horizontal in-situ stress difference of the formation,the more ob-vious the fault slip.The research findings provide reference for controlling the operation parameters in the multi-stage fracturing process of shale gas reservoirs.
关键词
页岩气/多级压裂/断层滑移/套管变形/数值模拟Key words
shale gas/multistage fracturing/fault slip/casing deformation/numerical simulation引用本文复制引用
基金项目
国家自然科学基金青年科学基金项目(52204018)
国家自然科学基金联合基金重点支持项目(U22A20164)
中国石油大学(北京)克拉玛依校区引进人才基金项目(XQZX20220019)
出版年
2024
NETL
NSTL
维普
万方数据