Experimental Study of Seepage Characteristic and Mechanismin Tight Gas Sands:A Case from Xujiahe Reservoir of Sichuan Basin
Received date: 2013-07-08
Revised date: 2013-12-10
Online published: 2014-06-10
Although the Darcy′s law with applicable speed limit was proposed in classical percolation mechanics,the non-Darcy percolation law is not clear under the low speed condition.7 groups of seepage simulation experiments of the Xujiahe tight gas reservoir in the Sichuan Basin were carried out with highest gas injection pressure of 10MPa and confining pressure higher than the injection pressure of 2-3MPa in order to ensure that the gas migrated along the tight sandstone rather than along the inner wall of the core and blessings.10-15 flow data points were determined in each experiment.The experiments of the complete process of gas migration in tight sandstone effectively explore the tight gas seepage mechanism.Results of the experiments indicate that the seepage process of tight gas has 3 stages (very low-velocity & non-linear stage,low-velocity & non-linear seepage,low-velocity & linear stage),and 4 seepage curve models (composite type,concave type,convex type,linear type).
GONG Yan-jie,LIU Shao-bo,JIANG Lin,YUAN Xuan-jun,TAO Shi-zhen . Experimental Study of Seepage Characteristic and Mechanismin Tight Gas Sands:A Case from Xujiahe Reservoir of Sichuan Basin[J]. Natural Gas Geoscience, 2014 , 25(6) : 804 -809 . DOI: 10.11764/j.issn.1672-1926.2014.06.804
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