储气库固井水泥石关键力学参数测试方法研究  

Study of the Test Method of Key Mechanical Parameters of Set Cement in the Gas Storage Well

作　　者：刘健[1] 郭小阳[2] 李早元[2] 

机构地区：[1]西南石油大学石油工程学院,四川成都610500 [2]"油气藏地质及开发工程"国家重点实验室.西南石油大学,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2013年第6期115-120,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家科技重大专项(2011ZX05021–004)

摘　　要：为了测量储气库固井水泥石关键力学参数抗拉强度和胶结强度,分别设计了测量两个力学参数的新方法,通过对6套典型储气库固井水泥石的实验测量和对比分析,发现新方法对储气库固井水泥石测量效果更佳,测量值更具合理性。典型储气库固井水泥石的抗拉强度值大致分布在1.5～3.5 MPa,与抗压强度之比分布在7%～13%,水泥石力学改性对抗拉强度有明显的影响;低密度水泥石的纵向胶结强度大致为0.7～1.5 MPa,正常密度水泥石大致为1.5～2.5 MPa,强度远超过支撑套管重量的要求,水泥环受套管作用而破坏的危险点不在纵向上而是在横向上。For the purpose of measuring the key mechanical parameters of set cement in the gas storage well： tensile strength and bonding strength, two new test methods were designed for the two mechanical parameters respectively. Through test measurement and comparative analysis of 6 sets of typical set cement from the gas storage well, we found that the new methods have better and more reasonable results. The tensile strength of typical＇ set cement from the gas storage is in the range of 1.5-3.5 MPa, which is about 7%-13% of the compressive strength. The mechanical modification to cement has remarkable effects on the cement＇s tensile strength. The longitudinal bonding strength of low density cement is about 0.7-1.5 MPa, and the normal density cement is roughly 1.5-2.5 MPa, which is far enough for supporting casing weight. The cement dangerous points because of the casing acting are not on the vertical but on the horizontal.

关 键 词：固井 储气库井 抗拉强度 胶结强度 测试方法 

分 类 号：TE256[石油与天然气工程—油气井工程]