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ISSN Print: 1091-028X
ISSN Online: 1934-0508
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MATHEMATICAL MODEL FOR PREDICTION OF DYNAMIC RESERVES LOSS DUE TO WATER INVASION IN WATER-DRIVE GAS RESERVOIR
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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