科研之友
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摘要
The organic pores in shale gas reservoirs are mostly of nanometer scale and the shale gas exists in multiple patterns, so multiple gas transport mechanisms coexist in organic nanopores of shale gas reservoirs. At present, it is in urgent need to figure out the way to establish a nanopore bulk phase gas transport model which can be used to describe all transport mechanisms under high pressure, to describe the surface diffusion in organic nanopores of shale gas reservoirs and to determine the contribution of the surface diffusion to gas transport. In this paper, a model for gas transport in organic nanopores of shale gas reservoirs was built by analyzing comprehensively the micro-scale effects of bulk phase gas transport, surface diffusion, real gas, and adsorption layer and stress sensitivity. Results show that the bulk phase gas transport model which was established based on the weighted superposition of slip flow and Knudsen diffusion can reasonably describe the bulk phase gas transport process;surface diffusion is an important transfer mechanism, and especially in nanopores, and it dominates the gas transport;and the stress sensitivity effect of shale gas reservoirs is different from that of conventional oil and gas reservoirs, and it is related to the organic mechanical properties and the effective stress, as well as the gas transport mechanisms. The model can be extended directly from indoor low-pressure conditions to high-pressure shale reservoirs. It provides a guidance for shale gas production performance analysis, productivity prediction and production system preparation.
- 出版日期2016
- 单位中国石油大学（华东）
