Simulation Study on Hydrate Production Using Step-wise Depressurization Enhanced by Fracturing Method
The low natural gas recovery rate induced by low permeability of hydrate reservoirs is one of the important factors limiting the commercial exploitation of natural gas hydrates.Improving the permeability of low-permeability oil and gas reservoirs using fracturing technology has become very mature and is gradually applied in hydrate exploitation.A two-dimensional axisymmetric hydrate production model is established to simulate the efficiency of step-wise depressurization production of nature gas hydrate enhanced by fracturing.By analyzing the pressure and saturation distribution of the core and the changes of gas and water production,the hydrate production efficiency under different fracturing conditions is compared,it is concluded that fracturing can accelerate the hydrate decomposition rate,shorten the production time,and improve the production efficiency and economy.
gas hydratesfracturingreservoir permeabilitystep-wise depressurization
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