Hello Professor, thanks for your video! If it's water-wetting, will the stage of forced water injection happen? For example, raising the water pressure causes some trapped non-wetting phases in the pore body to overcome the capillary resistance of the throat connected to it, then the S1 or Sw further increases.
You start with a rock sample at waterflood residual oil. You then surround the sample in a bath of oil and measure the change in saturation (this can be done my measuring the change in weight). Then inject oil at a positive pressure and again measure the change in saturation. Third, surround the sample with water, measure the change in saturation and finally inject water at a positive pressure to return to the initial condition - waterflood residual oil. There are special Amott cells for the imbibition steps (when the sample is surrounded by oil or water with no forced injection). From the changes in saturation you can calculate the Amott indices as indicated in the video.
Dear proffessore , is it true that : at conditions above the capillary pressure at Swi, capillary forces are entirely dominant, whereas outside the capillary pressure at 100% wetting-phase saturation, the conditions are analogous to the complete dominance of gravity forces, and within these two Pc-Sw endpoints, both gravity and capillary forces can be considered as being active.
This is not really correct - there is simply an equilibrium between gravitational and capillary forces. At the pore scale capillary forces dominate for the whole saturation range.
Got it the moment just when I needed it
Hello Professor, thanks for your video! If it's water-wetting, will the stage of forced water injection happen? For example, raising the water pressure causes some trapped non-wetting phases in the pore body to overcome the capillary resistance of the throat connected to it, then the S1 or Sw further increases.
this was great
Please can you describe how amott wettability test is done ?
You start with a rock sample at waterflood residual oil. You then surround the sample in a bath of oil and measure the change in saturation (this can be done my measuring the change in weight). Then inject oil at a positive pressure and again measure the change in saturation. Third, surround the sample with water, measure the change in saturation and finally inject water at a positive pressure to return to the initial condition - waterflood residual oil. There are special Amott cells for the imbibition steps (when the sample is surrounded by oil or water with no forced injection). From the changes in saturation you can calculate the Amott indices as indicated in the video.
@BoffyBlunt thank you very much sir
Dear proffessore , is it true that : at conditions above the capillary pressure at Swi, capillary forces are entirely dominant, whereas outside the capillary pressure at 100% wetting-phase saturation, the conditions are analogous to the complete dominance of gravity forces, and within these two Pc-Sw endpoints, both gravity and capillary forces can be considered as being active.
This is not really correct - there is simply an equilibrium between gravitational and capillary forces. At the pore scale capillary forces dominate for the whole saturation range.
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