Theoretical Study on Gas Flowing Model in Coal around Drilling
Abstract：In order to study the gas flowing situation in coal around drilling,a simplified model of capillary gas flow was established based on certain assumptions.According to fluid mechanics,seepage mechanics and some related knowledge of higher mathematics,the motion differential equations of capillary gas flow are derived and the flow quantity of capillary gas flow is calculated.Further more,the quantitative relationship between coal seam permeability and capillary diameter is obtained,and the relationship between gas flowing theory of capillary and coal seam permeability is established.On this basis,the theoretical calculation formula of drilling gas total flow at any time is obtained through further simplification.
Keywords：drillinggas flowcapillaryflow
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)