储能库井筒水泥环最大载荷解析解研究  

Integrity Analysis of Injection Production Wellhole of Underground Energy Storage

作　　者：张晓宇 李友华 万勇 敖扬钦 ZHANG Xiaoyu;LI Youhua;WAN Yong;AO Yangqin(Three Gorges Construction Engineering Co.,Ltd.of China Gezhouba Group,Yichang 443000,China;Hubei University,Wuhan 430062,China)

机构地区：[1]中国葛洲坝集团三峡建设工程有限公司,湖北宜昌443000 [2]湖北大学,湖北武汉430062

出　　处：《电力勘测设计》2023年第3期8-11,共4页Electric Power Survey & Design

摘　　要：水泥环作为地下储能库工程井筒结构的薄弱部分承受着周期载荷,对井筒的安全性有重要影响。为研究注采井筒水泥环的最大承载能力,基于极限分析中的安定理论对井筒模型进行应力分析,得到交变应力作用下的水泥环最大载荷解析解max P_(inner)。结果表明:水泥环最大载荷的解析解max P_(inner)与水泥石的内聚力、内摩擦角、井筒几何尺寸和地层地应力等因素有关,工程师可据此设计特定的参数组合,在保证井筒正常运行的同时提高压裂效率,从而满足生产要求。The sheath bearing the cyclic loading is the weak part of the wellbore in underground energy storage project,which has an important impact on the safety of the wellbore.In order to determine the maximum production load of the sheath,based on the shakedown theory in the limit criterion,the stress analysis of the wellbore model is carried out.The analytical solution of the maximum load of the cement sheath under repeated stress,max P_(inner),is obtained.The results show that the max P_(inner)is related to the cohesion,internal friction angle,physical dimension of the sheath and geostress.Based on this,engineers can design specific parameter combinations to ensure the normal operation of the wellbore and improve the fracturing efficiency to meet the production requirement.

关 键 词：地下储能 安定理论 周期载荷 水泥环 应力分析 

分 类 号：P641.8[天文地球—地质矿产勘探]