Calculation Method of Deviation Factor and Early Reserve Prediction of Shuangyushi Ultra-deep Gas Reservoirs with High Temperature and Pressure

doi:10.3969/j.issn.1006-6535.2022.01.011

Abstract

Abstract: In order to improve the accuracy of early dynamic reserve calculations for ultra-deep gas reservoirs with high temperature and pressure, a new DAR method was used to establish the independent variable functions of dimensionless pseudoreduced temperature and pressure by multiple regressions based on gas reservoirs in Shuangyushi Qixia Formation which was taken as the study object, the equations were continuously revised by comparing and analyzing with experimental data, and a new calculation equation was proposed for the deviation factor of ultra-deep gas reservoirs with high temperature and pressure; the method of determining the comprehensive compression coefficient of the reservoir at high temperature and pressures was given through comparative studies and laboratory tests on full-diameter samples for compression coefficient analysis. The results of the study showed that the established new calculation method for the deviation factor of gas reservoirs could improve the accuracy of early dynamic reserve prediction of ultra-deep gas reservoirs with high temperature and pressure by more than 3.0 percentage points; the rocks in the ultra-deep gas reservoirs with high temperature and pressure were micro-compressible, and the order of magnitude of their compression coefficients was equivalent to that of formation water; the example analysis showed that the prediction of deviation factor and the determination of compression coefficient of ultra-deep gas reservoirs with high temperature and pressure were the key to early accurate reserve calculation. The results of this study can be used as a reference for the early accurate calculation of dynamic reserves in ultra-deep gas reservoirs with high temperature and pressure.

Key words: reserve prediction, high-temperature and high-pressure gas reservoir, deviation factor, dynamic reserves, compression factor, Shuangyushi Qixia Formation

CLC Number:

TE155

Deng Bo, Lu Zhengyuan, Liu Qilin, Luo Jing, Liu Siqi, Peng Yang, Xiong Yu. Calculation Method of Deviation Factor and Early Reserve Prediction of Shuangyushi Ultra-deep Gas Reservoirs with High Temperature and Pressure[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 73-79.

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