The effects of electron pressure gradient term in the generalized Ohm’ law is studied by 3 D MHD simulation code under condition of high plasma Beta and small ion inertial length. The results show that the electron p...The effects of electron pressure gradient term in the generalized Ohm’ law is studied by 3 D MHD simulation code under condition of high plasma Beta and small ion inertial length. The results show that the electron pressure gradient term increases the velocity of electrons and ions, and therefore increases the field aligned current, finally leading to the increase of core magnetic field. Since the field aligned current is the principal way by which the magnetosphere is coupled with the ionosphere, the electron pressure gradient term enhances the coupling of magnetosphere ionosphere. The electron pressure gradient can also generate the dynamic Alfven wave. It is supposed that this Alfven wave may change the velocity of particles.展开更多
为改善传统颗粒型堵剂的不足,研究了一种由刚性内核及黏性覆膜组成的新型桥接颗粒的耐温耐盐性能、封堵性能和封堵机理。结果表明,桥接颗粒平均粒径为117.23μm,耐温耐盐性能较好,在150℃、矿化度为35g/L的条件下可稳定黏接;在注入速度1...为改善传统颗粒型堵剂的不足,研究了一种由刚性内核及黏性覆膜组成的新型桥接颗粒的耐温耐盐性能、封堵性能和封堵机理。结果表明,桥接颗粒平均粒径为117.23μm,耐温耐盐性能较好,在150℃、矿化度为35g/L的条件下可稳定黏接;在注入速度1.0 m L/min、颗粒注入量0.05 PV、颗粒质量分数5.0%和胍胶悬浮剂质量分数0.2%的条件下,桥接颗粒的封堵效果最佳,高渗砂管模型水驱压力梯度由封堵前的约3 k Pa/m增至41.82~141.70 k Pa/m,渗透率由封堵前的9~12μm2降至0.24μm2左右,有效封堵率大于97%。微观可视化实验结果表明,桥接颗粒调驱体系具有填充封堵、架桥-黏接封堵的功能。颗粒粒径大于孔喉直径时,颗粒发挥填充封堵功能;颗粒粒径为孔喉直径的1/3~2/3时,颗粒发挥架桥-黏接封堵功能。该桥接颗粒可用于水驱油田开发中后期高渗窜流通道的封堵。展开更多
文摘The effects of electron pressure gradient term in the generalized Ohm’ law is studied by 3 D MHD simulation code under condition of high plasma Beta and small ion inertial length. The results show that the electron pressure gradient term increases the velocity of electrons and ions, and therefore increases the field aligned current, finally leading to the increase of core magnetic field. Since the field aligned current is the principal way by which the magnetosphere is coupled with the ionosphere, the electron pressure gradient term enhances the coupling of magnetosphere ionosphere. The electron pressure gradient can also generate the dynamic Alfven wave. It is supposed that this Alfven wave may change the velocity of particles.
文摘为改善传统颗粒型堵剂的不足,研究了一种由刚性内核及黏性覆膜组成的新型桥接颗粒的耐温耐盐性能、封堵性能和封堵机理。结果表明,桥接颗粒平均粒径为117.23μm,耐温耐盐性能较好,在150℃、矿化度为35g/L的条件下可稳定黏接;在注入速度1.0 m L/min、颗粒注入量0.05 PV、颗粒质量分数5.0%和胍胶悬浮剂质量分数0.2%的条件下,桥接颗粒的封堵效果最佳,高渗砂管模型水驱压力梯度由封堵前的约3 k Pa/m增至41.82~141.70 k Pa/m,渗透率由封堵前的9~12μm2降至0.24μm2左右,有效封堵率大于97%。微观可视化实验结果表明,桥接颗粒调驱体系具有填充封堵、架桥-黏接封堵的功能。颗粒粒径大于孔喉直径时,颗粒发挥填充封堵功能;颗粒粒径为孔喉直径的1/3~2/3时,颗粒发挥架桥-黏接封堵功能。该桥接颗粒可用于水驱油田开发中后期高渗窜流通道的封堵。
