Enhanced Gas Recovery of the Low Permeability and Tight Sandstone Gas Reservoir
Received date: 2015-03-02
Revised date: 2015-06-21
Online published: 2015-11-10
The effect of stress on the reservoir permeability and the features of reservoir heterogeneity and formation water saturation were analyzed by means of a huge number of core experiments and test analyses of outcrop section fine coring in the typical low permeability tight sandstone gas reservoirs.With some representative samples,we analyzed the single-phase gas seepage state of low permeability sandstone reservoir,the impact of water saturation on gas permeability and gas water two phase percolation characteristics by conducting systematically single-phase gas seepage experiments,gas percolation experiments under aquiferous condition and seepage tests of gas-water two-phase.On this basis,we studied the impact of various factors such as reservoir permeability,aquiferous conditions,proration and abandoned conditions,longitudinal reservoir permeability differences and the lateral heterogeneity-blocking zone between reservoir sand bodies on the recovery efficiency of low permeability tight sandstone gas reservoir in the process of depletion-drive development by using the physical simulation experimental techniques for gas reservoir development.Then,these five kinds of factors were sorted according to the weight analysis.The results show that reservoir property and reservoir water saturation have the largest effect on the recovery efficiency,whose weight accounted for 0.24 and 0.38,respectively.This study laid a solid foundation for further improving gas reservoir recovery efficiency.
HU Yong，LI Xi-zhe，LI Yue-gang，XU Xuan，WANG Ji-ping，JIAO Chun-yan，GUO Chang-min . Enhanced Gas Recovery of the Low Permeability and Tight Sandstone Gas Reservoir[J]. Natural Gas Geoscience, 2015 , 26(11) : 2142 -2148 . DOI: 10.11764/j.issn.1672-1926.2015.11.2142
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