Are any of these "I" events more common in certain rock types than others? For instance I_1 is more common in sandstone while I_2 and I_3 more common in carbonates?
An excellent question. The relative frequency of these mechanisms is dependent on pore and throat geometry. In general snap-off is most common if throats are much smaller than pores, whereas the different pore-filling processes occur at similar pressures. In more uniform systems, I1 will be much more frequent. It is difficult to say what is the case in general for carbonates and sandstones - it depends on the exact structure of the rock.
Dear professor can i say snap off is capillary dominated flow where the front is not flat while cooperative pore filling is advection dominated flow where there is a shock (flat front )or this is irrelevant.
No, this is not correct. Both processes are capillary dominated. It is simply that cooperative pore filling alone does lead to frontal advance and little trapping.
Dear proffessor , in labrotary how can we consider the pump pressure is equal to the capillary pressure , its confusing me because i think pump pressure is the displacing fluid pressure and we have to apply capillary pressure formula (Pnw-Pw) to find it. thank you in advance
You are correct - the capillary pressure is the difference between the pressures in the phases. So this could be, for instance, the pressure in an injection pump of phase 2 minus the outlet pressure in phase 1.
The wettability is dependent on the oil and brine composition, as well as the temperature and pressure. Most carbonate oil reservoirs are mixed-wet or oil-wet.
Professor, I have prepared a PowerPoint presentation based on your explanation, illustrating pore filling, capillary pressure curve, and pressure differences between phases. I would like to share it with you if you are interested.
Thank you for the insightful video! Could you consider making one on contact hysteresis? Your expertise would be invaluable.
Yes, I have recently uploaded a video "Rocks and wettability" that covers this topic. Thank you for the suggestion.
🙏🙏
Are any of these "I" events more common in certain rock types than others? For instance I_1 is more common in sandstone while I_2 and I_3 more common in carbonates?
An excellent question. The relative frequency of these mechanisms is dependent on pore and throat geometry. In general snap-off is most common if throats are much smaller than pores, whereas the different pore-filling processes occur at similar pressures. In more uniform systems, I1 will be much more frequent. It is difficult to say what is the case in general for carbonates and sandstones - it depends on the exact structure of the rock.
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Dear professor can i say snap off is capillary dominated flow where the front is not flat while cooperative pore filling is advection dominated flow where there is a shock (flat front )or this is irrelevant.
No, this is not correct. Both processes are capillary dominated. It is simply that cooperative pore filling alone does lead to frontal advance and little trapping.
Dear proffessor , in labrotary how can we consider the pump pressure is equal to the capillary pressure , its confusing me because i think pump pressure is the displacing fluid pressure and we have to apply capillary pressure formula (Pnw-Pw) to find it.
thank you in advance
You are correct - the capillary pressure is the difference between the pressures in the phases. So this could be, for instance, the pressure in an injection pump of phase 2 minus the outlet pressure in phase 1.
@@BoffyBlunt thank you very much
What is the wettability in carbonate reseviore?
The wettability is dependent on the oil and brine composition, as well as the temperature and pressure. Most carbonate oil reservoirs are mixed-wet or oil-wet.
Professor, I have prepared a PowerPoint presentation based on your explanation, illustrating pore filling, capillary pressure curve, and pressure differences between phases. I would like to share it with you if you are interested.
Sure - email it to me at m.blunt@imperial.ac.uk