薄互层稠油油藏直平组合火驱技术

Fire flooding with the combination of vertical and horizontal wells in heavy oil reservoir of thin interbeds

D区块局部区域水平井连片分布,如何合理有效地利用水平井,使其在火驱中发挥最大效能,是需要研究的重点问题。在水平井蒸汽吞吐开发效果评价的基础上,根据水平井开发效果进行分类。针对不同类型水平井,制定相应的增产策略。运用数值模拟方法,对直井与水平井的配置关系、注气井射孔位置、注气强度、水平井排液量等关键参数进行优化设计,同时采用分层注气、吞吐引效、水平井间歇生产等手段改善火驱开发效果,为转火驱后水平井的合理利用提供了新的思路。

The distribution of horizontal wells is concentrated in Block D. The key of this paper is about how to utilize horizontal well reasonably and stimulate the largest potential of horizontal well during fire flooding. Based on the evaluation of steam huff and puff horizontal wells, development effects were classified. Enhanced recovery strategies have been developed corresponding to different types of horizontal wells. Through numerical simulation method, distribution of vertical and horizontal wells, perforating position of gas injection well, gas intake per unit thickness and production of horizontal well were optimized, meanwhile, separated zone gas injection, cyclic steam injection and periodical production of horizontal well were utilized to improve development effect of fire flooding, which suggests a new clue for reasonable utilization of horizontal well by fire flooding.