深水浅层天然气水合物固态流化开采的井壁稳定性研究  

Study on Wellbore Stability of Solid-State Fluidized Production of Natural Gas Hydrate in Deep Water and Shallow Layers

作　　者：许璐 袁凯涛 李锦源 闫训臣 李佳蓉 刘冯 XU Lu;YUAN Kaitao;LI Jinyuan;YAN Xunchen;LI Jiarong;LIU Feng(Yanchang Gas Field No.4 Production Plant,Yan'an Shaanxi 727501,China;Yanchang Oilfield Co.,Ltd.Dingbian Oil Production Plant,Yulin Shaanxi 718600,China;Changqing Oilfield Branch No.2 Gas Production Plant,Yulin Shaanxi 719000,China;Xi'an Alberta Environmental Analysis and Testing Technology Co.,Ltd.,Xi'an Shaanxi 710000,China;Xi'an Shiyou University,Xi'an Shaanxi 710065,China)

机构地区：[1]延长气田采气四厂,陕西延安727501 [2]延长油田股份有限公司定边采油厂,陕西榆林718600 [3]长庆油田分公司第二采气厂,陕西榆林719000 [4]西安阿伯塔资环分析测试技术有限公司,陕西西安710000 [5]西安石油大学,陕西西安710065

出　　处：《当代化工》2025年第1期32-35,41,共5页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:41372036)。

摘　　要：通过井壁应力分布、井壁温度和压力以及井壁材料结构的变化,探讨深水浅层天然气水合物固态流化开采过程中井壁稳定性的影响因素。结果表明:在高速率开采条件下,井壁应力从初始的5.00 MPa增加到24 h后的8.22 MPa,而井深从0 m到500 m时,应力从15.00 MPa增加到40.00 MPa。此外,随着流化速率从低至高的提升,井壁稳定性指数平均值从80.3降至71.2和62.4,表明井壁稳定性与流化速率成负相关。井壁温度在开采初期因水合物分解吸热下降至约70℃,随后因深层地热和岩石的热传导作用逐渐回升至约84.66℃。井壁压力因水合物分解释放气体而显著上升,从初始120 MPa增加至约145 MPa。研究成果强调了在深水天然气水合物开采过程中,合理控制开采速率和采用加强井壁稳定技术的重要性,为确保开采安全和效率提供了重要的科学依据。By experimental methods to monitor the dynamic changes of borehole wall stress distribution,borehole wall temperature and pressure,and microscopic changes in borehole wall material structure,the influencing factors of wellbore stability during the solid fluidization production of natural gas hydrate in deep water and shallow layers were deeply explored.The experimental results showed that under high-rate mining conditions,the well wall stress increased from the initial 5.00 MPa to 8.22 MPa after 24 h,and when the well depth was from 0 m to 500 m,the stress value increased from 15.00 MPa to 40.00 MPa.In addition,as the fluidization rate increased from low to high,the well wall stability index dropped from the average value of 80.3 to 71.2 and 62.4,indicating that the well wall stability was negatively correlated with the fluidization rate.The borehole wall temperature dropped to about 70℃ due to the decomposition and heat absorption of hydrates in the early stages of mining,and then gradually rose back to about 84.66℃ due to deep geothermal heat and thermal conduction of rocks.The wellbore pressure increased significantly due to the release of gas due to the decomposition of hydrate,from the initial 120 MPa to about 145 MPa.The research results of this article emphasized the importance of reasonably controlling the production rate and adopting well wall stabilization technology during the deepwater natural gas hydrate production process,providing important scientific basis for ensuring production safety and efficiency.

关 键 词：天然气水合物 固态流化开采 井壁稳定性 流化速率 

分 类 号：TE122.11[石油与天然气工程—油气勘探]