THE INFLUENCE OF DISJOINING PRESSURE ON FOAM STABILITY AND FLOW IN POROUS-MEDIA
THE INFLUENCE OF DISJOINING PRESSURE ON FOAM STABILITY AND FLOW IN POROUS-MEDIA
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DOI：
10.1016/0927-7757(94)80094-4
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发表时间：
1994-03-18
影响因子：
5.2
通讯作者：
RADKE, CJ
中科院分区：
文献类型：
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作者：
ARONSON, AS;BERGERON, V;RADKE, CJ
泡沫在多孔介质中的流动具有很大的流动阻力，是一种很有吸引力的驱替液，但要成为一种有效的驱替液，将气体离散成泡沫泡的层流必须保持稳定。本文研究了单泡沫膜的稳定性如何影响泡沫在多孔介质中的流动阻力，用分离压力的大小来衡量，测量了10（-3）M和0.017 M十二烷基硫酸钠（SDS）溶液在含和不含NaCl的情况下，在2.3 mum 2渗透性玻璃珠包中流动泡沫的稳态压力梯度和单泡沫膜的分离压力等温线。恒速流动实验表明，在0.50 M NaCl下，向10（-3）M SDS中加入盐可使珠包中的压力梯度从0.1 MPa m-1增加到4 MPa m-1。0.017 M SDS含量的表面活性剂溶液具有22 MPa m-1的压力梯度，与盐浓度无关。同样，在10（-3）M SDS溶液中加入盐，在0.50 M NaCl时，破裂压力从0.5 kPa提高到15 kPa以上，从而显著影响分离压力等温线。0.017 M SDS溶液的破裂压力在30 kPa以上，与盐浓度无关，说明泡沫膜的高排斥分离压力导致了多孔介质中的强泡沫。此外，我们发现，在多孔介质中的泡沫快速聚结的限制毛细管压力是接近的泡沫层破裂压力，从测量的分离压力等温线。
Foam flowing in porous media can exhibit large flow resistances that make it an attractive fluid for improving underground oil recovery, To be an effective displacement fluid, however, the lamellae, which discretize the gas into foam bubbles, must remain stable. This work studies how the stability of single foam films, as gauged by the magnitude of their disjoining pressures, influences the flow resistance of foam in porous media.Steady state pressure gradients of flowing foam in 2.3 mum2 permeability glass beadpacks and disjoining pressure isotherms of single foam films are measured for 10(-3) M and 0.017 M sodium dodecyl sulfate (SDS) solutions with and without NaCl. The constant-rate flow experiments show that the addition of salt to 10(-3) M SDS increases the pressure gradient in the beadpacks from 0.1 to 4 MPa m-1 at 0.50 M NaCl. Surfactant solutions of 0.017 M SDS content exhibit pressure gradients of 22 MPa m-1, quite independent of salt concentration. Likewise addition of salt to the 10(-3) M SDS solutions dramatically influences the disjoining pressure isotherms by raising the rupture pressure from 0.5 to above 15 kPa at 0.50 M NaCl. The 0.017 M SDS solutions display rupture pressures above 30 kPa, independent of salt concentration.We conclude that high repulsive disjoining pressures in single foam films lead to strong foam in porous media with large flow resistance. Further, we find that the limiting capillary pressure for rapid foam coalescence in porous media is close to the rupture pressure of foam lamellae as obtained from measured disjoining pressure isotherms.