Condensate gas reservoir fluid component monitoring device and fluid phase change characterization method

By designing a fluid component monitoring device and phase state analysis method for condensate gas reservoir, the problem of failure to consider the impact of pressure reduction on reservoir retention components in the prior art is solved, and more accurate characterization of phase state changes of condensate gas reservoir and acquisition of dynamic phase diagrams is achieved, which is of great significance to guide the development plan.

CN119686727APending Publication Date: 2025-03-25CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202311238792.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-25
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The prior art fails to consider the effect of pressure reduction on the retention components of the reservoir during production when characterizing the phase state of the condensate gas reservoir, resulting in the failure to accurately characterize the phase state changes.

Method used

A fluid component monitoring device for condensate gas reservoir is designed, and the pressure control and component separation of fluids in the core are achieved through the combination of injection pumps, fluid intermediate containers, core holders and gas-liquid separators. The chromatographic analyzer and material equilibrium calculation were used to monitor and calculate the changes in fluid components under different pressure stages, and the P-T phase diagram was obtained through simulation calculation through PVT sim phase state analysis software.

Benefits of technology

A more accurate characterization of the phase state changes of reservoir fluid during the development of condensate reservoir failure is achieved, and a dynamic phase diagram is provided, which can guide the design and strategy adjustment of the development plan.

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Abstract

According to the condensate gas reservoir fluid component monitoring device and the fluid phase state change characterization method provided by the embodiment of the invention, the component monitoring experiment and the material balance calculation are combined to simulate the component change condition of the retained fluid when the pressure of the reservoir is reduced to different pressure stages; pVT sim phase analysis software is combined to carry out state equation simulation calculation to obtain P-T phase diagrams of all pressure stages, the P-T phase diagrams are integrated to obtain a dynamic phase diagram of the depletion development process of the condensate gas reservoir, and the phase change condition of reservoir fluid in the depletion development process of the condensate gas reservoir can be more accurately represented according to the dynamic phase diagram. By means of the method, the phase state change condition of the fluid in the condensate gas reservoir development process can be predicted, and the method has important guiding significance on reasonable design and strategy adjustment of a development scheme.
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