Seepage state division of low permeability volcanic gas reservoir

The seepage law of gas in underground porous media is complex and gas seepage state varies a lot in different conditions. These have brought inconvenience to gas reservoir development.In order to distinguish the different seepage states of gas,based on the seepage state experiment of volcanic gas reservoir,this paper carries on the seepage state division.The seepage state experimental results indicate that: the relationship between gas log permeability and the reciprocal of average pressure is not linear as Klinkenberg said.At low pressure,they are exponential;at high pressure,they are logarithmic and at the middle section,they are nearly linear.According to the experimental results,Reynolds number greater than 1(Re 1)are the inertial flow segment;Knudsen number is greater than 10(Kn10) are strong slippage segment and between them are slippage segment.The seepage state division has certain significance to the volcanic gas reservoir development.