垂直井与水平井组合SAGD井距优化可视化实验研究,ACS Omega

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垂直井与水平井组合SAGD井距优化可视化实验研究
ACS Omega ( IF 3.7 ) Pub Date : 2021-10-27 , DOI: 10.1021/acsomega.1c04737
Lei Tao ₁ , Lilong Xu ₁ , Xiao Yuan ₁ , Wenyang Shi ₁ , Na Zhang ₁ , Songyan Li ₂ , Shuanghu Si ₁ , Yuxiang Ding ₁ , JiaJia Bai ₁ , Qingjie Zhu ₁ , Huajun Du ₃

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对于油砂油藏，蒸汽辅助重力泄油（SAGD）技术是最有效的热采技术之一。然而，传统SAGD技术在开发薄油砂油藏时，油粘度高、热损失严重，严重影响了SAGD的生产效果。因此，改进SAGD技术对提高薄油砂油藏采收率至关重要。本文采用垂直井与水平井相结合的SAGD（VH-SAGD）技术，研究了不同井距（垂直注蒸汽井与水平生产井的水平距离）对蒸汽室开发的影响. 通过相似性判据，得到实验参数。在那之后，设计了改进的 2D 可视化物理模型，在设备内部安装了 9 × 9 高精度热电偶，以监测实时温度。该实验物理模型不仅可以准确捕捉温度分布，还可以通过可视窗口显示模型内部腔室的连续变化过程。最后，对不同井距情况（10、15和20 cm）进行了测试，以观察蒸汽室的发展并分析生产数据。温度分布和可视窗口均表明蒸汽室有四个明显的阶段，合理的井距可以促进蒸汽室的发育。井距较小时，两侧冷油未波及面积大，蒸汽室面积重叠较多。当井距相对适中时，蒸汽室最完整，采收率最高。井距较大时，两侧冷油未波及面积虽小，但中冷油区比前两组大。因此，15 m左右油砂油藏的最佳井距为15～20 m，其中VH-SAGD方法具有较好的驱替效果和较高的采收率。实验结论可为薄油砂油藏的开发提供理论支持。中冷油区比前两组大。因此，15 m左右油砂油藏的最佳井距为15～20 m，其中VH-SAGD方法具有较好的驱替效果和较高的采收率。实验结论可为薄油砂油藏的开发提供理论支持。中冷油区比前两组大。因此，15 m左右油砂油藏的最佳井距为15～20 m，其中VH-SAGD方法具有较好的驱替效果和较高的采收率。实验结论可为薄油砂油藏的开发提供理论支持。

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Visualization Experimental Study on Well Spacing Optimization of SAGD with a Combination of Vertical and Horizontal Wells

For oil sand reservoirs, the steam-assisted gravity drainage (SAGD) technique is one of the most efficient thermal recovery technologies. However, the high oil viscosity and the severe heat loss seriously affect the production effect of SAGD in developing thin oil sand reservoirs by the traditional SAGD technology. Therefore, it is essential to improve the SAGD technology to enhance the recovery of the thin oil sand reservoir. In this paper, SAGD with a combination of vertical and horizontal well (VH-SAGD) technology was adopted, and the influence of different well spacings (horizontal distance between vertical steam injection wells and horizontal production wells) on the development of steam chambers was investigated. By the similarity criterion, the experimental parameters were obtained. After that, an improved 2D visualization physical model was designed with 9 × 9 high-precision thermocouples installed inside the device to monitor the real-time temperature. This experimental physical model can not only accurately capture the temperature distribution but also display the continuous change process of the chamber inside the model by the visible window. Finally, different well spacing cases (10, 15, and 20 cm) were tested to observe the development of the steam chamber and analyze the production data. Both the temperature distribution and visual window showed that the steam chamber has four obvious stages, and reasonable well spacing can promote the development of the steam chamber. When the well spacing is relatively small, the unswept area of the cold oil on both sides is large, and the area of the steam chamber overlaps more. When the well spacing is relatively moderate, the steam chamber is the most complete and the recovery factor is the highest. When the well spacing is relatively large, although the unswept area of the cold oil on both sides is small, the middle cold oil area is larger than the previous two groups. Therefore, the best well spacing for oil sand reservoirs of about 15 m thickness is 15–20 m, where the VH-SAGD method has a better displacement effect and higher oil recovery. The experimental conclusions can provide theoretical support for the production of thin oil sand reservoirs.

更新日期：2021-11-09

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