关键词: 多油层油藏, 分层注水, 稳产条件, 井网加密, 可采储量, 产液量, 含水率, 注水量

Abstract:

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.

Key words: multilayered reservoirs, separate zone water injection, stable production condition, well pattern infilling, recoverable reserve, liquid production capacity, water cut, water injection rate