Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 103-108.doi: 10.3969/j.issn.1673-8926.2015.02.016

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Estimation of water influx in condensate gas pool by means of productivity index curve

CHEN Jun1， QIN Ke1， REN Hongwei2， Y IN Shuangjiang3， L I Bing4   

  1.  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ， Chengdu 610500 ，China ； 2. Chongqing Gas Field ， PetroChina Southwest Oil and Gas Filed Company ， Chongqing 401330 ， China ；3. Hancheng Company ， PetroChina Coalbed Gas Company ， Hancheng 715400 ， Shanxi ， China ； 4． School of Materials Science and Engineering ， Southwest Petroleum University ， Chengdu 610500 ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

Water drive condensate gas reservoir account for a certain proportion in developed gas field. There is a special phenomenon that this type of gas reservoir could condensate in the progress of development, resulting more complicated calculation of the water influx. As a special gas reservoir for condensate gas reservoir, the retrograde condensation liquid will appear in the fluid when the pressure is below dew point pressure. Based on the production characteristics of condensate gas reservoir, this paper derived a new linear material balance equation of water drive condensate gas reservoir, and it takes the influence of condensate oil on the calculation of water influx in gas reservoir into account when the pressure is below dew point pressure. Production index curve drawn by means of this equation can be used to calculate the water index of condensate gas reservoir in different periods conveniently, fast and accurately. Example application shows that compared with the rest calculation methods, this method is simpler and faster and the calculated result is more accurate and practical.

Key words: shale, fracture, permeability, brittle mineral, fracability, logging response characteristics, Subei Basin

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