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依据孔隙介质中的弹性波理论，以 Ｃ Ｏ２ 气体为对象，研究了无介质和有孔隙介质两种情况下气体相态转变的超声波测试新方法。结果表明：超声波声速和衰减对 Ｃ Ｏ２ 气体相变敏感；而孔隙介质可能一定程度地影响了 Ｃ Ｏ２ 气体的相行为，既改变其饱和蒸汽压，也减缓其相变的突变程度。这种超声波方法有望进一步发展为研究孔隙介质中凝析气相行为的新测试技术。
According to the theory of elastic wave in porous media, a new method of ultrasonic testing for gas phase transition under both media-free and porous media was studied for C O 2 gas. The results show that the velocity and attenuation of ultrasonic wave are sensitive to the phase transition of C O2 gas, while the pore medium may affect the phase behavior of C O2 gas to a certain extent, not only changing the saturated vapor pressure but also decreasing the abrupt change of phase transition. This ultrasonic method is expected to be further developed as a new test technique for studying the gas phase behavior of condensate gas in porous media.