Volume 39 Issue 2
Apr.  2011
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YANG Xinhui, LI Bingang, LI Xin. Injection time of injection/fall off test in the low-permeability coal seam[J]. COAL GEOLOGY & EXPLORATION, 2011, 39(2): 26-29. DOI: 10.3969/j.issn.1001-1986.2011.02.006
Citation: YANG Xinhui, LI Bingang, LI Xin. Injection time of injection/fall off test in the low-permeability coal seam[J]. COAL GEOLOGY & EXPLORATION, 2011, 39(2): 26-29. DOI: 10.3969/j.issn.1001-1986.2011.02.006
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Injection time of injection/fall off test in the low-permeability coal seam

  • Xi'an Research Institute, China Coal Techonology and Engineering Group Corp, Xi'an 710054, China

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  • Received Date: May 19, 2010
  • Available Online: March 09, 2023
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    • Abstract
  • The purpose is to obtain the rough injection-time range when the radial flow happens during injection/fall-off test in low-permeability coal seam. Based upon the theory and experience of injection/fall-off test, studies of large amounts of real data and field experiments on the spot were conducted, and finally the feasible measures were presented, which is to reduce the well-bore storage time, prolong testing time and realize third-level well bore configuration in CBM well. The results show that within certain testing time, if radial flow happens during injection/fall-off test in low-permeability coal seam, it must guarantee tinj> 3twb, tfall≥2tinj under conditions of ensuring well-bore safety.
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