A New Method for Determining Deviation Coefficient of Highly Sour Gas in Ultra Deep Reservior

doi:10.11885/j.issn.1674-5086.2021.09.07.01

Abstract

Abstract: Accurate calculation of the deviation coefficient of natural gas multi-component system is very important for gas reservoir reserve evaluation, gas storage and surface equipment design. It is usually determined by experimental measurement, pseudo-critical pressure and temperature by querying the Standing-Katz chart, equation of state and empirical formula. Experimental determination and equation of state are expensive and complicated due to the variation of temperature and pressure conditions of gas and the existence of non-hydrocarbon components such as hydrogen sulfide. At the same time, it is not clear whether traditional empirical formulas such as DAK, DPR can be applied to calculation of the deviation coefficient of high sulfur gas with reservoir depth of more than 5 000 meters and non-hydrocarbon component content of 20%. Based on the regression of 999 data points of deviation coefficient of deep gas with high sulfur content measured in Changxing Formation gas reservoir of Yuanba Gas Field, a prediction model of deviation coefficient Z is obtained by pseudo-contrast pressure and pseudo-contrast temperature. The correlation coefficients of the proposed model with DAK, DPR, Beggs-Brill, Papay empirical formula and LXF analytical model are compared. The results show that the correlation coefficient between the z-factor model and the measured values is over 99%, and the calculation accuracy is obviously better than the traditional empirical formula method. The model presented in this paper can be used to determine the deviation coefficient of ultra-deep gas with high sulfur content in the pressure range of 0~70 MPa and temperature range of 30~150 ℃. The model is used to draw the relationship diagram of Z value with pseudo-contrast pressure in the range of pseudo-contrast temperature 1.02≤T_pr≤2.20 and pseudocontrast pressure 0.1≤P_pr≤20.0. It provides a useful reference for the efficient development of ultra-deep gas reservoirs with high sulfur content.

Key words: ultra deep, sour gas, deviation coefficient, Yuanba Gas Field, Standing-Katz chart

CLC Number:

TE312

REN Shilin, CHEN Xi, LAN Hui. A New Method for Determining Deviation Coefficient of Highly Sour Gas in Ultra Deep Reservior[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(6): 157-163.

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