摘要
由于水驱气藏模型无因次水侵量精确解的特殊形式,故必须知道水体的大小及水侵系数才能计算水侵量的大小,但有时很难估算水体的大小及水侵系数,使得有关计算无因次水侵量的几种方法均各有弊端。文章结合数值反演法,只需要生产动态数据,将βR、BR、rD、G参数作为识别参数,建立计算水驱气藏最优化数学模型。该方法避免了以往需要不容易确定的与水体有关的参数,而这些参数恰好影响地质储量及水侵量的计算准确程度。通过优化模型求解直接获得地质储量及水侵量的大小,同时还可以确定水域大小和水侵系数。实例对比分析表明,此方法具有计算过程简单、快速,计算结果准确、实用的特点,不失为一种有效方法。
Due to the special form for the exact solution of the dimensionless aquifer influx in the model of water-drive gas reservoirs, the aquifer influx can't be calculated until the aquifer size and the water-invaded coefficient are known. Sometimes) it is difficult to estimate the aquifer size and the water-invaded coefficient. So, there are shortages for the methods to calculate the dimensionless aquifer influx respectively. With numerical inversion method, Only taking parameters of production performance data as the identification parameters, the mathematic model of the optimized calculating water-drive gas reservoirs is set up. The method keeps out of the uncertain parameters concerned to the aquifer, which neither more nor less affects the calculating accuracy of the gas in place and the aquifer influx. With the optimized model solution, the gas in place and the aquifer influx can be obtained directly and the aquifer size and the water-in-vaded coefficient can be determined. The comparison and analysis of real cases show the method has the characteristics of simple and fast calculating process as well as accurate and reliable calculating results, which is an effective method.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第5期75-77,共3页
Natural Gas Industry
基金
中国石油天然气总公司项目(气田开发一体化综合评价系统软件集成)成果的一部分(970506-07)。~~
