The journal bearing is pivotal for the advancement of refrigerant compressors. While the gas-oil lubrication mechanism has been explored in some previous studies, the dynamic coefficients of gas-oil lubricated bearings in pressurized refrigerant environments remain understudied. This paper introduces a comprehensive analysis that extends the solubility-based compressible Reynolds equation (CRE) to derive the perturbed pressure in response to journal displacement and velocity. The approach generalizes the partial differential CRE (PDCRE) to calculate the dynamic coefficients, offering new insights into the dynamic coefficients of gas-oil lubricated journal bearings under high-pressure conditions. The results delineate a notable elevation in the attitude angles under a pressurized refrigerant environment. It is also observed that the direct stiffness and coupled damping coefficients of two-phase bearing, especially under lighted load scenarios, are significantly higher than the results from the low-ambient-pressure scenarios. Besides, higher rotational speeds increase the Sommerfeld number and attitude angle, yet it concurrently reduces the stiffness and damping coefficients. The numerical results indicate that the characteristics of the investigated gas-oil lubricated journal bearing are significantly different from those in the atmosphere conditions, which should be meticulously considered in the bearing design and simulation of a high-pressure compressor.