冀东油田复杂断块油藏水驱采收率计算方法

Water drive recovery calculating method for complex faulted block reservoir in Jidong oilfield

复杂断块油藏在我国油田开发中占重要位置,与整装砂岩油藏相比,其开发水平和开发程度都有较大的差距。对于冀东油田这类构造岩性层状复杂断块油藏来说,注采井网仍不能有效控制全部的地质储量,仍有很大一部分储量无法通过水驱开发。冀东油田复杂断块注水开发油藏注采井网以不规则点状注水井网形式为主,常规油藏工程计算采收率方法无法满足生产要求。将冀东油田复杂断块构造岩性油藏不规则点状注采井网分为4类13种油砂体井网配置模式,分别计算每种模式极限面积波及系数,进而计算区块水驱采收率和理论采收率。根据建立的复杂断块油藏水驱采收率计算方法,计算了冀东油田复杂断块油藏水驱采收率,与标定采收率相比,复杂断块油藏理论采收率计算方法的计算结果与动态法差别较小。

Complex faulted block reservoir got important position in domestic oilfield development, contrast with integrity reservoir, the developing level and effect has a long backward. For complex faulted block reservoir with tectonic lithologic layer in Jidong oilfield, injection-production pattern was not able to control whole reserve effectively, a lot of reserve was lost control by water drive. Irregular point water injection gave priority to the injection-production pattern of complex faulted block reservoir in Jidong oilfield, the common recovery calculating method was not suitable. The irregular point water injection was classified by 4 categories, 13 species oil-sand and pattern styles, limit area sweep efficiency for each style was calculated. After that the fault injection recovery and theory recovery was calculated, contrast with calibration recovery, the calculating result got few number difference which proved reliability of the calculating method.