识别非均质油田无效注采井和层的数学模型

多层砂岩油藏注水开发后期,在油水井之间形成了储层高渗透通道,导致注入水沿高渗透通道做无效循环,油井产量下降.为改善注入水驱油效果,必须对无效注采井层实施调剖、堵水等措施,而有效识别无效注采井层是解决问题的关键.优选出了识别无效注采油水井和无效注采层位的判定指标,并建立了用于识别无效注采油水井和无效注采层位的模糊综合评判数学模型.

Mathematical Model for Identifying Wells and Layers with Ineffective Injection-production for Heterogeneous Oilfield

For multi-layer sand reservoir,high permeability channel would be formed between oil well and water well at the later stage of water flooding.This caused the injected water circulates with no efficiency and thus decreased the oil wells' production.Measures of profile control and/or water shutoff must be taken in order to improve the effect of water driving oil.The key problem is to identify the wells and layers having ineffective circulation.In this paper,the indexes have been determined for identifying ineffective injection-production circulation and corresponding mathematical model was constructed with fuzzy theory.