Research on Impact Energy Dissipation Characteristics of Cement of Coalbed Methane Wells Based on SHPB Test
CHEN Lichao1,2, WANG Shengwei1,3, ZHANG Diankun1
1 State Key Laboratory of Coal and CBM Co-mining, Jincheng 048204, China 2 School of Mining and Technology,Inner Mongolia University of Technology, Hohhot 010051, China 3 Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
Abstract: The impact damage of cement of coalbed methane wells is the key to restrict the integrity of wellbore and the ability of interlayer isolation. In this study, impact energy time history evolution, the relationship between the energy distribution and energy absorption efficiency of pure cement, fiber cement were studied using the split Hopkinson pressure bar apparatus, the relationship between impact energy and material damage were analyzed combined with the dynamic damage feature, concluded that: (Ⅰ) fiber cement's absorption energy reaches equilibrium later, indicating that the energy demand of pure cement weakens after brittle fracture, while the energy demand of fiber cement remains high in the later period due to incomplete ductile fracture;(Ⅱ) the impact damage of pure cement is brittle fracture, while that of fiber cement shows uniform fai-lure characteristics, and the toughening effect of fiber is significant; (Ⅲ) the impact energy absorption efficiency of fiber cement is improved through interfacial dissociation and fiber pullout effect, and the damage degree of the sample is relatively light; (Ⅳ) the quantitative relationship between the energy distribution under impact of cementing materials and the evolution of material structure and strength, as well as the external loading conditions is critical.
陈立超, 王生维, 张典坤. 基于SHPB实验的煤层气井固井水泥冲击能量耗散特征研究[J]. 材料导报, 2021, 35(Z1): 232-237.
CHEN Lichao, WANG Shengwei, ZHANG Diankun. Research on Impact Energy Dissipation Characteristics of Cement of Coalbed Methane Wells Based on SHPB Test. Materials Reports, 2021, 35(Z1): 232-237.