Using similarity theory to design natural gas hydrate experimental model

Experimental simulation is an important approach to study the gas hydrate dissociation mechanism, and similarity theory is an effective tool for the design of experimental model. Based on hydrate kinetic reaction model in HydrateResSim, seventy-three similarity numbers are derived by means of inspectional analysis and dimensionless analysis. Gas production from the natural gas hydrate reservoir is controlled by two mechanisms, namely dissociation-controlled mechanism and flow-controlled mechanism. Two groups of schemes are put forward for the design of experimental model of natural gas hydrate according to these two mechanisms respectively: for flow-controlled hydrate reservoir the scale of injection rate of heat and water, and parameters associated with size is the same with that of length, the scale of time is the square of length scale; for dissociation-controlled hydrate reservoir, the scale of parameters associated with size is the same with that of length, the scale of absolute permeability is 4/3 times square of length scale, the scale of time is 2/3 times square of length scale, the scale of injection rate of heat and water is 7/3 times square of length scale. (C) 2014 Elsevier B.V. All rights reserved.