Gas-Seepage Characteristics of Coalbed Reservoirs with Different Water Saturation in the Qinshui Basin
详细信息
- 责任者：Chen Xia(General Division I ; PetroChina Huabei Oilfield Company ; Langfang 065007 ; China) ; Liu Honglin
- 刊名：Acta Petrolei Sinica
- 出版年：2011
- 卷期：32(3)
- 关键词：煤层气 ; coalbed gas ; 渗流 ; seepage flows ; 沁水盆地 ; Qinshui Basin
- 页码：p.500-503
- 图表：3 illus., 1 table, 10 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
Coalbed methane (CBM) exists in pores of coal matrix mainly in adsorption state under an artesian condition,it can not be exploited until draining water and dropping pressure. The paper investigated seepage characteristics of some coal rocks sampled from the Qinshui Basin and categorized curves of the water drainage and gas exploitation into three representative types, namely upward-protruding, downward-concaving and composite types. It was found that the higher the aqueous saturation, the greater the gradient of the start-up pressure, which is of great significance not only in making a proper procedure of the water drainage and gas exploitation but also in improving effects of water drainage and gas production.