Expandable graphite particles as a novel in-depth steam channeling control agent in heavy oil reservoirs
Expandable graphite particles as a novel in-depth steam channeling control agent in heavy oil reservoirs
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DOI：
10.1016/j.cej.2019.03.028
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发表时间：
2019-07
影响因子：
15.1
通讯作者：
Guang Zhao;Caili Dai;Chenglin Gu;Q. You;Yongpeng Sun
中科院分区：
文献类型：
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作者：
Guang Zhao;Caili Dai;Chenglin Gu;Q. You;Yongpeng Sun
首次将一种新型可膨胀石墨(EG)颗粒用于稠油油藏蒸汽窜槽深度控制。与天然石墨(NG)粒子相比，EG粒子具有特殊的插层结构，使其在水蒸气温度条件下能够正常膨胀。结果表明，EG颗粒初期呈椭圆形或圆形，呈微米级分布，高温老化后呈现蠕虫状结构。温度越高，EG颗粒越容易膨胀。通过在EG颗粒体系中加入聚合物，改善了颗粒的悬浮性能。基于充砂流动实验，高浓度的EG颗粒体系一般表现出较强的蒸汽窜流控制能力。在稠油油藏注汽过程中，EG颗粒能有效膨胀形成蠕虫状结构。膨胀的EG颗粒可以直接堵塞孔喉或滞留在高渗透蒸汽通道中，有效地控制蒸汽通道，将注入的蒸汽分流到低渗透层。这些EG颗粒体系可作为其他类似注汽稠油油田蒸汽窜流控制的替代方案。
A novel expandable graphite (EG) particles were initially used for in-depth steam channeling control in heavy oil reservoirs. Compared with natural graphite (NG) particles, EG particles have a special intercalation structure, which makes it possible to expand normally at the steam-temperature conditions. The morphology results show that EG particles are oval or circular with micron-size distribution at the initial stage but that the structure changes into a worm-like structure when aging at high temperatures. The higher the temperature, the easier the EG particles will expand. By adding polymer into the EG particle system, the particle suspension performance is improved. Based on the sand-pack flowing experiment, EG particle system with high concentrations generally exhibits powerful steam channeling control capacity. The EG particles could effectively expand and form a worm-like structure during steam injection in heavy oil reservoirs. The expanded EG particle can effectively control steam channel by directly plugging pore throat or becoming retained in high permeability steam channels, which could divert the injected steam into low permeability zones. These EG particle systems may be an alternative used for steam channeling control in other similar steam injection heavy oilfields.