Influencing factor and type of water production of CBM wells: Case study of Shizhuangnan block of Qinshui Basin
Received date: 2016-07-25
Revised date: 2017-03-30
Online published: 2017-05-10
Shizhuangnan block was taken as a case study to examine the water sources of CBM wells with high water production.After analyzing the relationship between typical daily water and gas production data from 58 producing wells in the X-1 well area of Shizhuangnan block,some controlling factors of the CBM wells with high water production were discussed,and some characteristics of water productions started emerging.Some preliminary conclusions are proposed as follows:(1)Water production of CBM wells can be generally sourced from “Syngenic” and “Allogenic” water;Allogenic water is the main cause of high water production of CBM wells,and the pore-fractures networks,faults and fractures in the coal-bearing formation provide suitable migration pathways for such water production.(2)A significant negative correlation between typical daily water production and typical daily gas production appears to exist,at least from some wells in the study area.The typical daily water production with main syngenic water in the coalbed is commonly 2-7m3/d,in contrast other wells with main water sourced from allogenic water is typically greater than 7m3/d,with 43.8% of such wells producing more than 14m3/d.The high water production prevents lowering coal reservoir pressure which in turn restricts the increase of gas production of such CBM wells.(3)Based on the analysis of water sources and recharge paths,five water production types are proposed,and the identification and prediction methods of high water yield are also present which can provide a basis for the prediction of water production in the field.
Key words： Shizhuangnan block; CBM; Influence factor; Type of water production
Zhu Xue-shen，Liang Jian-she，Liu Ying-hong，Wang Cun-wu，Liao Xia，Guo Guang-shan，Lü Yu-min . Influencing factor and type of water production of CBM wells: Case study of Shizhuangnan block of Qinshui Basin[J]. Natural Gas Geoscience, 2017 , 28(5) : 755 -760 . DOI: 10.11764/j.issn.1672-1926.2017.04.007
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