新型水驱特征曲线在递减率评价中的应用--以潜江组某典型单元为例

Application of New Water Drive Characteristic Curve in Decline Rate Evaluation--A case of the Qianjiang Oil-Reservoir in the Qianjiang Sag

近年来,国际原油价格持续低迷,老区控递减是一种有效途径,因此不同开发单元递减率的评价非常关键。水驱特征曲线能够用于递减率分析,目前常用的4种水驱特征曲线已不适于高含水期油藏,因此开展了新型水驱曲线理论推导和高含水油藏递减规律研究,以潜江组高含水期典型油藏为对象,在单元历史数据拟合基础上开展定采液速度下理论自然递减率推导,有效指导递减合理性判断与分析。

In recent years,the international crude oil price has been continuously depressed,and the old oilf ields control production decline rate is an effective way,Therefore,it is very important to evaluate the decline rate of dif ferent development units.Water drive characteristic curve can be used for decline rate analysis.At present,the 4 commonly used water drive characteristic curves are not suitable for reservoirs with high water cut stage.Therefore,theoretical derivation of new water drive curve and Research on decline law of high water c ut reservoir are c arried out.Taking typical reservoir of Q ianjiang Sag as research object,production data of high water cut stage are used to f it relevant data,and water drive characteristic curve is used to study the variation law of water cut.In order to determine the natural decline rate of production,the variation law of production liquid index is calculated by theoretical method.