Physical Simulation of Reserve Producing State in Water-bearing Tight Sandstone Gas Reservoir
Received date: 2015-03-25
Revised date: 2015-04-22
Online published: 2015-12-10
Using long core multipoint press measurement experimental facility,three-group long cores were connected by a number of sandstone cores which have permeability of (1.38-1.71)×10-3μm2,(0.41-0.73)×10-3μm2,(0.049-0.084)×10-3μm2,to simulate the process of depletion-drive in water-bearing sandstone reservoir.Pressure profile from reservoir boundary to gas well was measured and recorded during the experimentation to study the characteristics of reserve utilization.The study shows that,the gas production characteristics,pressure profile shape,pressure drop process,residual pressure distribution of tight sandstone gas reservoir are very different from those of convention gas reservoir,all of which were influenced by permeability and water saturation more obviously.For those with the same water saturation (about 35%),when the production is carried out until abandonment pressure,the pressure profile of convention gas reservoir will drop to zero,while residual pressure of tight gas reservoir still maintains 50% of the initial,and has bigger pressure gradient.The results show that for water-bearing tight sandstone gas reservoir,the lower permeability,the more difficult and less equitability of reserves utilization.Considering water saturation,when water saturation increase,the pressure profile′s shape and drop process of convention reservoir show little change,but to low-permeability reservoir especially tight reservoir,the pressure profile shape changes remarkably,in high water saturation,pressure drop spread outward difficultly,less effective and equitability of reserve utilization.
XU Xuan，HU Yong，WAN Yu-jin， XU Yi，TIAN Shan-shan，GAN Zhong-hai . Physical Simulation of Reserve Producing State in Water-bearing Tight Sandstone Gas Reservoir[J]. Natural Gas Geoscience, 2015 , 26(12) : 2352 -2359 . DOI: 10.11764/j.issn.1672-1926.2015.12.2352
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