稠油油藏夹层沿程展布对SAGD生产特征的影响

Influence of Shale Barrier Distribution Variation Modes along Horizontal Well on SAGD Production Characteristics in the Heavy Oil Reservoirs

为了研究夹层沿水平井的分布对SAGD开发效果造成的影响,针对不同夹层沿程分布模式下SAGD井组生产效果差异较大的问题,本文结合加拿大长湖油田SAGD井组夹层分布情况,以实际地质模型为基础,考虑夹层的剖面宽度和与井组的垂向距离两个重要影响因素,通过建立数值模拟机理模型分析隔夹层沿水平井分布对SAGD开发的影响效果,划清夹层影响下的储量技术开发界限。研究结果表明,当夹层与井组的垂向距离越高、夹层剖面宽度越小时,夹层沿水平井分布对SAGD生产的影响不明显;当夹层与注汽井的垂向距离小于10 m、夹层剖面宽度大于30 m时,沿程夹层展布占比越大,夹层距离SAGD井组的距离和夹层宽度的影响越大。研究结果对SAGD降低新投产区低效井比例、提升整体开发效果具有较好的指导意义。

In order to study the influence of the distribution of shale barriers along the horizontal well on the development effect of SAGD,aiming at the large difference in production effect between well pairs under different shale barrier distribution modes,based on the actual geological model,this paper combined the distribution of shale barriers in the SAGD well pairs in Long-lake oilfield,Canada,and considered the two important influencing factors.Numerical simulation mechanism models were established to analyze the effect of the distribution of shale barriers along the horizontal well on the SAGD development,and to delineate the reserve technology development boundary.The research results show that when the shale barrier is further from the well pair and the width of the shale barrier is smaller,the distribution of shale barriers along the horizontal well has no obvious impact on SAGD production.When the vertical distance between the barrier and the injector is less than 10 m or the width of the barrier is greater than 30 m,the greater the proportion of shale barrier along the wellbore,the greater the influence of the two factors.This has good guiding significance for SAGD to reduce the proportion of low-efficient wells in the new production area and improve the overall development effect.