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Buffalo油田复盖了Williston盆地西南翼部的大部分地区,Williston盆地位于南达科塔西北角。1987年,把该油田(8440acre)分成了两个单元,以便用两种方法(注空气和水驱)进行IOR作业。选择了18年的采油历史后,在两个项目之间进行了比较,以便确定这两个单元的相对成功性。根据增油量、估算的最终采收率和单位注入流体的增采油量,论述了这两个项目的技术动态。用常规递减曲线分析方法估算了单井的一次采油最终采收率。在假定实际开发方案和作业策略相同的情况下,通过外推两个单元的目前采油动态估算了最终采收率。在这18年期间,和与其“成对”的水驱单元(WBBRRU)相比,注空气单元(WBRRU)的采油动态要好得多。在该油田把注空气作为IOR方法的一些优点如下:注空气采油见效较快,采油量较高,增油量较大。这一实例研究清楚地说明,特别是在深层、高压、低渗透油藏中把注空气作为提高采收率的有效方法在技术上是可行的。这些油藏的注水能力受到限制,并且采用其他开采工艺也不经济。注空气是一种高风险、不成功的采油工艺这一观点是不成立的;相反,该工艺是一种可行的采油方法。
The Buffalo field covers most of the southwestern wing of the Williston Basin, located in the northwest corner of South Dakota. In 1987, the field (8440acre) was split into two units for IOR operations using both methods (air and water flooding). After 18 years of oil production history, a comparison was made between the two projects to determine the relative success of the two units. The technical developments of these two projects are discussed based on the oil yield, the estimated final recovery and the amount of oil produced by the injected fluid per unit. The single well final recovery rate was estimated by the conventional descending curve analysis method. The final recovery factor is estimated by extrapolating the current production dynamics of both units, assuming the actual development scenario and job strategy are the same. During this 18-year period, the WBRRU achieved much better oil production than its “twin” waterflood unit (WBBRRU). Some of the advantages of using air injection as an IOR method in this field are as follows: NOTE Air production is quicker, with higher oil production and larger oil production. This case study clearly shows that it is technically feasible to inject air into the deep, high-pressure, low-permeability reservoirs as an effective method to enhance oil recovery. The ability to inject water into these reservoirs is limited and the use of other mining processes is not economical. The notion that air injection is a high-risk, unsuccessful oil recovery process is not valid; instead, the process is a viable oil recovery method.