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

• 石油与天然气工程 • 上一篇    下一篇

致密砂岩天然气扩散能力研究

杨建1,2 康毅力1 桑宇3 李前贵1   

  1. 1.“油气藏地质及开发工程”国家重点实验室?西南石油大学,四川 成都 610500;2.中国石油西南油气田公司博士后科研工作站,四川 成都 610051; 3.中国石油大学(北京)石油天然气工程学院,北京 102249
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-12-20 发布日期:2009-12-20

RESEARCH ON DIFFUSIBILITY OF THE GAS IN TIGHT SAND GAS RESERVOIR

YANG Jian1,2 KANG Yi-li1 SANG Yu3 LI Qian-gui1   

  1. 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

摘要: 致密砂岩储层岩性致密,自生粘土矿物类型丰富且含量高,造成致密砂岩储层晶间微孔发育,岩石比表面积巨大,实验测得平均比表面积为2.13m2/g。在储层发育的纳微尺度空间内,天然气分子在其中的赋存状态以吸附为主,一旦微孔介质中天然气浓度发生变化,克努森数大于10时,吸附天然气将解吸、扩散、运移。实验室测定致密砂岩天然气扩散系数平均为6.86×10-5m2/s,通过模拟典型致密砂岩气井生产周期内天然气扩散量,证实扩散是致密砂岩天然气重要产出方式之一。

关键词: 致密砂岩, 气藏, 克努森数, 物理吸附, 扩散

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

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