依据见水速度优化注采压差研究——以鄂尔多斯盆地某砂岩油藏为例

Study on optimized injection-production pressure difference based on breakthrough velocity

为了实现面积注采井网在平面上的均衡水驱,提高扫油面积系数,依据反九点井网油井见水时间公式,在假设各采油井见水时间相同的条件下,建立了注采压差优化模型。研究表明,合理的注边压差(注水井与边采油井之间的压差Δps)与注角压差(注水井与角采油井之间的压差Δpc)之比,与几何因子和储层渗流因子的乘积成反比。对鄂尔多斯盆地某砂岩油藏正方形反九点井网实际资料分析和计算表明:接近合理的注边压差与注角压差之比的注采关系更有利于均衡水驱。

In order to bring about balanced water displacement and enhance swept areal coefficient,an optimized model about injection-production pressure difference has been established according to breakthrough time equations of inverted 9-spot well pattern by assuming every breakthrough time of production well is equal.The rational ratio of △ps(differential flowing pressure of injection well and production well on the side)to △pc(differential flowing pressure of injection well and production well on the corner)is inversely proportional to the product of geometrical factor and reservoir seepage factor.Based on the practical production data of Ordos basin,calculation results have been given.It is concluded that the rational △ps/△pc is more beneficial to balanced displacement.