When oilfield development is in medium-later period, gas will occur in fluid flow due to the draw down of reservoir pressure.
当油田开发到中后期，由于地层压力的下降，实际上往往有气相参与流动。
When oilfield development is in medium-later period, gas will occur in fluid flow due to the draw down of reservoir pressure.
当油田开发到中后期，由于地层压力的下降，实际上往往有气相参与流动。
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