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| Gas-water two-phase flow mechanism in visual microscopic pore model |
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LI Deng-wei1,ZHANG Lie-hui1,ZHOU Ke-ming2,GUO Liao-ping1
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(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation f Southwest Petroleum University，Chengdu 610500，China ;2. Research Institute of Exploration and Development, Southwest Oil and Gas Field Branch Company, Chengdu 610051，China)
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| Abstract: |
| A series of gas-water two-phase flow experiments in low permeability cores were conducted by using laser etched microscopic pore model. Hie model was water-wet system. Flooding medium was distilled water added by methyl red，while gas was nitrogen. Research results show that gas and water distribution and flow patterns in both pores and throats are mainly aerated water in lower drive pressure circumstances. The water flows aiong the wall and the gas flows in the central channels. The water invasion results in the trapped gas, and five main reasons are circumfluence, cut off phenomenon, unconnected pores or blind comers and " H" channels. The water lock also is the major feature of two-phase flow in porous medium. In heterogeneous model, gas recovery can be enhanced by reducing gas pressure or raising drive pressure drawdown. |
| Key words: visualisation microscopic pore model gas-water two-phase flow trapped gas |
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