Abstract
Not all reserves in the production affected zone are utilized during the development of oil fields. It is of great significance for the efficient development of oil fields to clarify the utilization degree of oil and gas in the production affected zone. A quantitative characterization parameter of the utilization degree of oil and gas in production affected zone is proposed, which is the utilization efficiency of oil and gas. Mathematical and physical models were established, and combined with the example of the X well area of Xifeng Oilfield, Ordos Basin, China, a systematic study was conducted on the physical meaning, influencing factors, determination methods, and production significance of utilization efficiency of oil and gas. Studies have shown that the utilization efficiency of oil and gas is the ratio of the volume of oil and gas utilized to the volume of oil and gas in the production affected zone. For a particular reservoir, it is mainly affected by two factors: driving pressure and accumulation force. Among them, the driving pressure affects the volume of oil and gas utilized, and the accumulation force affects the volume of oil and gas accumulated. The relative size of the two determines the utilization efficiency of oil and gas. When the driving pressure is less than the accumulation force, oil and gas are partially utilized. When the driving pressure is equal to the accumulation force, all oil and gas are utilized. When the driving pressure is greater than the accumulation force, all the oil and gas are utilized and the formation water is produced. This study shows that optimizing the driving pressure (or production pressure difference) with accumulation force can improve the utilization efficiency of oil and gas and avoid or reduce formation water production. This research provides a new basis for the optimal adjustment of production pressure difference, and has important reference significance for water control and oil stabilization and efficient development in oil fields.
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