聚驱复杂裂缝参数数值模拟研究

Numerical Simulation Study on Complex Crack Parameters of Polymer Flooding

聚合物驱作为一种注水开发后期有效的三次采油技术,具有采油速度快,有效时间短的特点。合理的采出井压裂措施能短时间内最大程度提高采收率。以克拉玛依油田某裂缝情况复杂区块反五点法井网为例,采用数值模拟方法,分别建立垂直裂缝和水平裂缝模型,对本区块裂缝穿透比和裂缝导流能力进行优选。结果表明:根据优选结果可以看出,压裂主要目的是解堵,为避免水较快突进,影响产量,穿透比不应选择过大,应该选择最优值,导流能力对产能影响较大,同样存在最优值。最佳穿透比和最佳导流能力分别为0.3和40μm2·cm。

Polymer flooding is an effective tertiary oil recovery technology in the late stage of water injection development.It has the characteristics of quick oil production rate and short effective time.Reasonable fracturing measures can maximize the oil recovery in a short time.In this paper,the vertical and horizontal fracture model was established by numerical simulation method,and the crack penetration ratio and fracture conductivity of the block were optimized.The results showed that,the main purpose of fracturing was to remove the plug;in order to avoid the rapid water bursting to affect the yield,the penetration ratio should not be too large.The optimum penetration ratio and the best diversion ability were 0.3and 40μm^2.cm,respectively.