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MATHEMATICAL MODEL FOR PREDICTION OF DYNAMIC RESERVES LOSS DUE TO WATER INVASION IN WATER-DRIVE GAS RESERVOIR

Volume 22, Issue 12, 2019, pp. 1507-1518
DOI: 10.1615/JPorMedia.2019026226
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ABSTRACT

Dynamic reserves of a gas reservoir are all flowing gases information. In a water-drive gas reservoir, lots of gases are trapped in formation pores due to water invasion and defined in this paper as a dynamic reserves loss. To quantify such loss, an experimental study was first developed with cores from the PG gas field, China. Results show that the dynamic reserves loss percentage decreases in general with the increase of value of the comprehensive pore structure characteristic parameter defined by k/φ. For a given core sample, the increase of the pressure gradient of the formation radial displacement results first in a decrease and then an increase of dynamic reserves loss percentage. According to experimental results, a mathematical model was developed to predict water-invasion dynamic reserves loss and applied in six gas wells with water production in the PG gas field. Calculations indicate that the dynamic reserves loss percentage is 43.17~50.67%, with a mean of 46.24%. In other words, the dynamic reserves loss is 5.38 × 108 to 17.63 × 108 m3, with a mean of 10.77 × 108 m3. The estimated recoverable remaining dynamic reserves is 1.98 × 108 to 14.31 × 108 m3, with a mean of 7.71 × 108 m3. This paper includes both experiments and a mathematical model to predict dynamic reserves loss in a water-drive gas reservoir.

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CITED BY
  1. Li Jiqiang, Yang Shenyao, Qi Zhilin, Zhao Guanqun, Yin Bingyi, Mo Fei, A calculation model for water breakthrough time of gas wells in gas reservoirs with edge water considering interlayer heterogeneity: A case study of the Lower Triassic Feixianguan gas reservoirs in the Puguang Gas Field, Natural Gas Industry B, 7, 6, 2020. Crossref

  2. Tang Yong, Hu Shilai, He Youwei, Wang Yong, Wan Xiaojin, Cui Shuheng, Long Keji, Experiment on CO2-brine-rock interaction during CO2 injection and storage in gas reservoirs with aquifer, Chemical Engineering Journal, 413, 2021. Crossref

  3. Zhou Mengfei, Li Xizhe, Hu Yong, Xu Xuan, Jiang Liangji, Li Yalong, Physical Simulation Experimental Technology and Mechanism of Water Invasion in Fractured-Porous Gas Reservoir: A Review, Energies, 14, 13, 2021. Crossref

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