Control Mechanism of CCUS-EOR for CO2-rich Gas Injection in Bailian Condensate Reservoir

doi:10.11885/j.issn.1674-5086.2022.07.05.01

Abstract

Abstract: To further improve the recovery of the remaining condensate oil and gas reservoirs in the depleted stage of Bailian structural oil and gas reservoir group in Fushan Sag, and to give full play to the comprehensive utilization benefits of the replacement development of CO$_2$-rich gas reservoirs in the Bailian structural belt, based on the development strategy of "carbon peaking and carbon neutralization", combined with the concept of independent carbon emission reduction and carbon neutralization during oil and gas reservoir development, Fushan Oilfield has established a development strategy based on CCUS-EOR technology to directly inject the associated gas recovered from CO$_2$-rich gas reservoirs in the Bailian structural belt into depleted condensate gas reservoirs. The phase analysis of the mixed-phase drive mechanism, the analysis of the long thin tube gas injection drive efficiency and minimum mixed-phase pressure, the analysis of the seepage characteristics of the gas-driven anticondensate in the reservoir core, and the numerical simulation of the gas injection drive components were carried out to study the control mechanism. It is found that gas injection can increase the remaining anticondensate saturation by 1.85 times. When gas injection pressure rises to 20.4 MPa, the mixed fluid can achieve a multiple-contact mixing phase. And the minimum engineering MMP is 21.13 MPa. The condensate recovery of long core mixed phase drive can reach 68.94%. The pilot test scheme of periodic gas injection assisted with gravity miscible flooding was determined and carried out. Numerical simulation and the monitoring of the change of flow composition and PVT phase analysis method in the field show that the control mechanism of the oil and gas transportation and the change of condensate and gas flow direction is the synergistic effect of dissolution and swelling, extraction, gravity mixed-phase drive and reservoir inhomogeneous flow, which provides a reference for the selection of CCUS-EOR technical policy for resuming production of condensate oil in subsequent production wells.

Key words: depleted condensate gas reservoir, CO$_2$ miscible flooding, control mechanism, enhanced oil recovery, carbon emission reduction

CLC Number:

TE372

CUI Kai, CHEN Qiang, LIU Desheng, SUN Lei, WANG Yong. Control Mechanism of CCUS-EOR for CO₂-rich Gas Injection in Bailian Condensate Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 115-126.

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Control Mechanism of CCUS-EOR for CO₂-rich Gas Injection in Bailian Condensate Reservoir

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