On the basis of Zhang Jinqing's water drive characteristic curve and the basic principle of material balance, and using displacement efficiency expressions of water flooding, volumetric sweep efficiency expressions of water drive and the relationship between average water saturation and exit-end water saturation, this paper deduce the theoretical relationship formulae between displacement efficiency, volumetric sweep efficiency and water cut in a water-flooding oilfield, and puts forward a new method to calculate displacement efficiency and volumetric sweep efficiency with dynamic data in a water-flooding field. A case study shows when water cut is 100%, the volumetric sweep efficiency calculated with Zhang's water drive characteristic curve is 99.7%, and that calculated with Sipachev's water drive characteristic curve is 100%, which proves that the method with Zhang's water drive characteristic curve can more accurately reflect the actual field situation, and is more rational. Study shows the method is simpler, more efficient and cost-saving than conventional core test, reservoir engineering and numerical simulation methods, moreover, it overcomes the narrow application scope of the aforementioned methods.%基于张金庆水驱特征曲线,从物质平衡基本原理出发,利用水驱驱油效率表达式、体积波及系数表达式及Welge方程中油水两相区平均含水饱和度与出口端含水饱和度的理论关系,推导出水驱驱油效率、体积波及系数与含水率的理论关系式,并提出一种计算水驱油田驱油效率和体积波及系数的新方法.通过实例计算,当含水率为100％时,张金庆水驱特征曲线法计算的体积波及系数值为99.7％,而西帕切夫水驱特征曲线法计算值为100％.计算结果证实张金庆水驱特征曲线法更能准确反映矿场实际,更具合理性.研究表明,该方法不仅较传统的岩心测试、油藏工程及数值模拟研究等方法更简便、高效、节约成本,而且成功解决了这些方法适用范围窄等问题.
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