Material Balance Equation and Dynamic Reserve Calculation of CO2-rich Gas Reservoir

doi:10.11885/j.issn.1674-5086.2018.09.25.04

Abstract

Abstract: For an accurate calculation of dynamic reserve during the depletion-drive development of CO₂-rich gas reservoir, which is a consequence of release of dissolved gas, a material balance equation is established considering water encroachment, reservoir stress sensitivity, water vapor concentration, and release of dissolved gas. PVT experiments were performed to investigate changes in the solubility of natural gas mixtures with a CO₂ concentration of 3.18%~53.90% when the pressure dropped from 53.01 MPa to 3.01 MPa. Based on the experimental results, a prediction model for solubility analysis was developed based on regression. To investigate the effect of high CO₂ concentration on the dynamic reserve calculation of gas reservoirs, the latter (denoted by A) was calculated utilizing the pressure drop method, the reserve computation model only considering stress sensitivity, the reserve computation model considering stress sensitivity, water vapor concentration and water vapor expansion, as well as the proposed computation model that also considered high CO₂ concentration. The results showed that when the effect of the release of CO₂-rich natural gas was not considered, the calculated dynamic reserves were considerably high, with errors ranging from 0.69×108 m³ to 2.55×10⁸ m³. Therefore, its effect cannot be ignored in the evaluation of the dynamic reserve of gas reservoirs.

Key words: CO₂-rich gas reservoir, material balance equation, experimental study, release of dissolved gas, dynamic reserve calculation

CLC Number:

TE33⁺2

CHENG Tao, LUAN Xueying, WANG Wenjuan, LIU Pengchao, Lü Xindong. Material Balance Equation and Dynamic Reserve Calculation of CO₂-rich Gas Reservoir[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 140-146.

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Material Balance Equation and Dynamic Reserve Calculation of CO₂-rich Gas Reservoir

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