蒸汽超覆对块状超稠油油藏剩余油分布影响研究

利用测井资料，结合油藏地质特征，建立了非均质地质模型。通过高温吸汽剖面、井温剖面、产液剖面等测试资料的分析，利用数值模拟手段研究了蒸汽吞吐开采过程中蒸汽的超覆作用，揭示了蒸汽超覆导致独特的油层温度分布特征及井间剩余油分布特征。研究表明，通过改变油井射孔方式、调整注汽参数等措施可以有效地减缓蒸汽超覆，提高油层纵向动用程度，降低油层纵向上的剩余油。在油层下部钻水平井，采取直井与水平井组合重力泄油方式，可以有效地动用井间剩余油，提高原油采收率。

Influence of steam overlay on residual oil distribution in massive super heavy oil reservoirs

A heterogeneous geological model is established by using logging data and combining with reservoir characteristics. Testing data, such as high temperature steam entry profile, temperature profile, and liquid production profile are analyzed. The impact of steam overlay during cyclic steam stimulation is studied through numerical modeling. It is revealed that steam overlay has resulted in unique reservoir temperature distribution and interwell residual oil distribution. The study shows that, steam overlay can be effectively reduced through changing perforation and adjusting injection parameters to improve vertical reservoir producing degree. Interwell residual oil can be produced by drilling horizontal well in the lower section of the reservoir and by gravity drainage through combination of vertical and horizontal wells to improve oil recovery factor.