生产动态确定底水油藏油井水淹范围的新方法

A New Method for Determining the Flooding Range of Oil Well in Bottom-Water Reservoir Based on Dynamic Production

底水油藏开采过程中油井会因底水锥形上升造成水淹,研究油井的水淹范围对底水油藏挖潜十分重要。利用油井的实际生产数据回归丙型水驱特征曲线进而求取油井不同含水率时的波及系数,同时将锥体范围等效表征为几何体,通过数学计算,得到底水油藏直井和水平井的水淹范围计算公式。该公式体现了油井的动态生产特征,较之常规静态法求取的水淹范围更能真实地反应油井实际情况。以渤海Q油田某砂体为例验证,利用该公式计算的结果准确反映了该砂体的剩余油分布状况,与数值模拟结果一致。

When the bottom-water reservoir is developing, the well will be flooding by the rising cone of the bottom water.The research of flooding range is of great significance for developing remaining oil in bottom water reservoir.This paper uses the actual production data of oil well to return the C-type water flooding characteristic curve;then, get the sweep efficiency of different water cut according to the regression result;on the other hand, the cone range is equivalently represented as a geometry;finally, the flooding range formula of vertical well and horizontal well in bottom-water reservoir is obtained by mathematical calculation.This formula reflects the dynamic production characteristics of oil well, compared with the conventional static method, it is more real responsive to the flooding range of oil well.Taking a sand of the Bohai oilfield Q as an example, the results calculated by this formula accurately reflect the residual oil distribution of the sand, which is consistent with the numerical simulation results.