The Expansion and Application of Deviation Factor Chart of Super-high Pressure and High CO2 Gas Reservoir

doi:10.11885/j.issn.1674-5086.2020.06.13.01

Abstract

Abstract: Standing-Katz plate is one of the most common and basic methods to determine the deviation factor of natural gas. However, there are some problems, such as large error in manual reading, limited use of natural gas with super-high pressure (p_pr>15) and high CO₂ content. We design a single component deviation factor measurement experiment, and combined with the changing rule of the curve of the Standing-Katz plate, expand the p_pr to 30, the T_pr to 3.6, and digitize the plate. Through different CO₂ content deviation factor tests, and a new calculation model of pseudo critical pressure and pseudo critical temperature of natural gas considering different CO₂ content is derived. Compared with the conventional non-hydrocarbon correction model, the new model has higher calculation accuracy and wider application range. Furthermore, the new correction model is embedded in the deviation factor expansion chart, and the software is used. The deviation factor expansion chart considering different CO₂ content has a smaller error (≤3 %) in the calculation of the deviation factor of HTHP and high CO₂ content natural gas in the west of South China Sea, and the application effect is better.

Key words: super high pressure, deviation factor, Standing-Katz plate, digitization, correction of critical parameters considering CO₂

CLC Number:

TE311

LU Ruibin, WANG Wenjuan, ZHANG Qiaoliang, HU Lin, CHEN Jian. The Expansion and Application of Deviation Factor Chart of Super-high Pressure and High CO₂ Gas Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 97-104.

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The Expansion and Application of Deviation Factor Chart of Super-high Pressure and High CO₂ Gas Reservoir

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[1]	LEI Xiao, DAI Jincheng, CHEN Jian, HAN Xin, LU Ruibin. Study on Influence of High CO₂ Content on Gas Deviation Factor of Natural Gas [J]. 西南石油大学学报(自然科学版), 2019, 41(4): 120-126.
[2]	Xiong Zhifu*, Deng Jinhua, Chen Dan. The Comprehensive Evaluation of the Deviation Factor Calculation of Natural Gas in Northeast Sichuan [J]. 西南石油大学学报(自然科学版), 2015, 37(4): 60-66.
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