RESEARCH ON DIFFUSIBILITY OF THE GAS IN TIGHT SAND GAS RESERVOIR

doi:10.3863/j.issn.1674-5086.2009.06.016

西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (6): 76-79.DOI: 10.3863/j.issn.1674-5086.2009.06.016

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RESEARCH ON DIFFUSIBILITY OF THE GAS IN TIGHT SAND GAS RESERVOIR

YANG Jian^1,2 KANG Yi-li¹ SANG Yu³ LI Qian-gui¹

1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China;2.Postdoctoral Research Center,Southwest Oil and Gas Field Company,CNPC,Chengdu Sichuan 610051,China)JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SCIENCE & TECHNOLOGY EDITION)，VOL.31，NO.6,76-79,2009（ISSN 1674-5086，in Chinese

Received:1900-01-01 Revised:1900-01-01 Online:2009-12-20 Published:2009-12-20

Abstract

Abstract: In tight sandstone gas reservoir,there is high content of clay mineral,which provides abundant intercrystal pores and surface area compared with conventional reservoir.Experiment reveals that the average specific surface area of tight sandstone is 2.13m2/g.Natural gas will be adsorbed in the micro-nano spaces.When Knudsen number is greater than 10,adsorption gas will display desorption,diffusion,migration.Average diffusion coefficient of the gas in tight sandstone is 6.86×10-5m2/s.Simulation of gas well diffusive flux for typical tight sandstone shows that diffusion is one of the very important ways to tight sandstone gas mass transfer during production.

Key words: tight sandstone, gas reservoir, Knudsen number, physical adsorption, diffusion

CLC Number:

TE122
TE319

YANG Jian;KANG Yi-li SANG Yu LI Qian-gui . RESEARCH ON DIFFUSIBILITY OF THE GAS IN TIGHT SAND GAS RESERVOIR[J]. 西南石油大学学报(自然科学版), 2009, 31(6): 76-79.

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RESEARCH ON DIFFUSIBILITY OF THE GAS IN TIGHT SAND GAS RESERVOIR

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