关键词: 固井, 储气库井, 抗拉强度, 胶结强度, 测试方法

Abstract:

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.

Key words: cementing, gas storage well, tensile strength, bonding strength, test method