Abstract
During water drive development, the formation pressure of low permeability reservoirs is often kept at a low level. Can gas injection quickly replenish the energy of low permeable reservoirs? Can miscible gas flooding substantially increase the daily oil rate? Will gas injection affect the properties of oil produced, and how does the composition of produced oil change? What is kind of factors influencing the change of gas drive producing performance and the basis of gas flooding development stages division. After more than ten years of field gas drive practice in China, some important understandings have been obtained.
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