水驱开发断块型油藏注采参数调整——以大庆油田北二西F断裂两侧断块为例

为了实现断块型油藏安全有效的水驱开发,需要保证断裂面两侧断块内现有注采关系下的平衡地层压力差小于断裂的最大静摩擦力。文中以断块为计算单位,把相同井网下注水井作为注液单元,采油井作为采液单元,求取断块内平衡地层压力。将断裂两侧断块内平衡地层压力差值与断裂最大静摩擦力进行比较,结果表明,F断裂两侧断块内现有注采条件下的平衡地层压力差满足安全生产的要求,但断块平衡地层压力比原始地层压力高,可以通过降低采油井的井底流压,使断块内平衡地层压力回落至原始地层压力。

Injection-production parameter adjustment of water flooding development: taking two fault-blocks on both sides of F Fault of Daqing Oilfield Bei'erxi as examples

In order to realize the safe and effective water flooding development for fault-block reservoir,the balance formation pressure difference of the fault-blocks on both sides of the fault is ensured to be less than the fault maximum static friction force under existing injection-production relationship.Under the same well pattern,taking fault-block as the calculating unit,the injection wells as the injection fluid unit,and the production wells as the liquid production unit,the fault-block balance formation pressure was calculated to compare the balance formation pressure difference of the fault-blocks on both sides of the fault with the fault maximum static friction force.The results show that under the condition of current injection-production the balance formation pressure difference of F Fault meets the requirements of safety in production,but the fault-block balance formation pressure is higher than the original formation pressure.Reducing the production wells bottom hole flowing pressure can return the balance formation pressure to the original formation pressure.