多油层油藏分层注水稳产条件与井网加密调整

实现注水开发油田的稳产,须提高产液量,以弥补产油量的下降。当现有的井网适应性变差,提高产液量受到限制时,就应该进行井网加密调整以增加井点数改善油层动用状况,来提高产液量。提高产液量是实现油田稳产的基本条件,井网加密调整,提高水驱控制程度,增加可采储量则是实现油田稳产的必要条件。油田稳产的5个要素包括含水率、产液量、井网密度、注水量及注水时机。以含水率与产液量关系建立了油田稳产方程,表述了不同含水阶段实现油田稳产的技术界限。根据统计规律提出了井网密度与可采储量增长率表达式,该计算式可用于预测不同开发阶段井网加密调整可采储量的增幅。对保持产液量稳定增长的宏观注水原则进行了论述。

Stable production conditions and well pattern infilling for development of multilayered reservoir with separate zone water injection

Increasing liquid production is considered as the basic condition for stabilizing oilfield production with water injection. When the current well pattern adaptation becomes worse, well pattern infilling should be implemented to support and ensure oilfield stable production. If increasing liquid production is considered as the basic condition for oilfield stable production, well pattern infilling, improvement of control degree of water flooding and increasing recoverable reserves are the prerequisites for it. The key elements for stabilizing production include water cut, liquid production capacity, well spacing density, water injection rate and timing of water injection. The formula for stabilizing production which is established on the correlation between water cut and liquid production rate can describe the technical limit for stable production of oilfields with different water cut at different stages. The correlation formula between well spacing density and incremental rate of recoverable reserves was proposed with the statistics method. The formula can be used to predict the increment of recoverable reserves using well pattern infilling method in different development stages of waterflooding oilfield. The macroscopic water injection technology was discussed for sustaining stable production of oilfield.