考虑胶结面孔隙影响的套管-水泥环胶结面应力场分析
Analysis of the stress field of casing-cement sheath cementation surface considering the influence of cementation surface pore
秦翊玮 1赵新波 2吕健1
作者信息
- 1. 青岛理工大学 理学院,青岛 266525;青岛市岩土力学与近海地下工程重点实验室,青岛 266525
- 2. 青岛理工大学 理学院,青岛 266525;青岛市岩土力学与近海地下工程重点实验室,青岛 266525;青岛市地下非常规能源开发工程研究中心,青岛 266525
- 折叠
摘要
考虑到套管-水泥环胶结面的力学性质和胶结面孔隙结构形状的影响,基于弹性力学理论,建立了套管-胶结面-水泥环-地层组合体力学模型,同时借助有限元分析方法,建立了套管-水泥环胶结面孔隙数量与孔隙结构形状对应力场的影响系数,得到考虑胶结面孔隙影响的套管-水泥环胶结面应力场的表达式.研究结果表明:当孔隙存在时Mises等效应力增大 12.50%,径向应力增大 9.30%,环向应力增大 8.65%.套管-水泥环胶结面孔隙数量与孔隙结构形状会加剧应力场的非均匀性.孔隙数量对应力场影响更大,影响系数最大为 1.1524.研究结果对于井筒系统安全性评价具有一定的工程价值.
Abstract
Considering the mechanical properties of casing-cement sheath cementation surface and the influence of pore structure shape of cement surface,the mechanical model of casing-cement surface-cement sheath-formation combination is established based on the theory of elasticity,and with the help of finite element analysis method,the influence coefficients of pore number and pore structure shape of casing-cement sheath cement surface on the stress field are established.The expression of the stress field of casing-cement sheath cementation surface considering the effect of cementing surface clearance is obtained.The results show that when the pores exist,the Mises equivalent stress increases by 12.50%,the radial stress increases by 9.30%and the circumferential stress increases by 8.65%.The pore number and pore structure shape of the casing-cement sheath cementation interface will aggravate the non-uniformity of the stress field,and the pore number has a greater influence on the stress field,with the maximum influence coefficient being 1.1524.The research results have cer-tain engineering value to the safety evaluation of wellbore system.
关键词
套管-水泥环胶结面/力学模型/孔隙率/影响系数/应力场Key words
casing-cement sheath cementation surface/mechanical model/porosity/influence coefficient/stress field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资助项目(52104004)
出版年
2024
NETL
NSTL
维普
万方数据