TY - JOUR
TI - Experimental study on the thermal damage characteristics of cement stone
AU - Xu Feng
AU - Qian Bowen
AU - Tan Ling
AU - Xu Jianqiang
AU - Tang Shengchuan
AU - Ren Qingyang
AU - Hou Zhenkun
JN - Thermal Science
PY - 2021
VL - 25
IS - 5
SP - 3327
EP - 3335
PT - Article
AB - Aiming at the problem of cement ring sealing failure during deep high temperature shale gas exploitation, comprehensively considering the influence of the characteristics of multi-cluster fracturing of multiple horizontal wells and formation temperature, the cementing cement the southwest region is taken as the research object. After exposure to different temperatures (95°C and 135°C) and for different times (5, 10, and 20 times), axial and triaxial tests with different confining pressures (0, 5 MPa, 15 MPa, and 30 MPa) were carried out. The research shows that: the stress-strain curve of cement stone after heat treatment can be divided into four stages: compaction, elastic, yield, and post-peak stage; as the confining pressure increases, the compaction phase disappears, the yield phase increases, and we see the transition from brittle to ideal plasticity after the peak and as the temperature and number of thermal cycles increase, the cohesive force decreases significantly, and the internal friction angle shows a slight increase. The elastic modulus and the peak strength decreased.