As a geoscientist i would like to thank you. Very simple and understandable explanation, learned alot from this lecture which does NOT include any formulas, numbers etc...
I am trying to pick up some ESP application skills. I feel more confident understanding PVT diagrams after watching your video. Thank you for posting this!
If we had a volatile oil and when produced had lots of associated gas, which was reinjected. How would that evolved on the phase diagram? The pressure would increase and could you reinject indefinitely? Or would there be a scenario where the oil would become oversaturated and a gas cap could form?
Overall material - oil - is removed from the reservoir, so the pressure will drop even if all the associated gas is re-injected. The overall composition of the reservoir will become more gas-like, so the phase diagram will change to reflect this. This means that we are likely to see a separate gas phase and the formation of a gas cap.
Thanks for this presentation. Still to come, wish if you kindly add your insight to the controversial "retrograde condensation" zone inside the PT two-phase envelope. How you present it to your students?
This is discussed in this video and the subsequent lecture 6. Retrograde condensation - the formation of a liquid from a gas when the pressure is dropped - is what happens in a gas condensate field. It is not controversial, but a consequence of the phase behaviour. I tend not to use the expression retrograde condensation as it usually causes confusion. I simply explain what happens for different types of hydrocarbon field.
Thank you for the presentation Mr. Martin. This is so helpful content. I have a question sir, i still did not understand about the critical point term, i understand that when the reservoir pressure hits the bubble point line there is a small bubble of gas appears from the liquid. In my mind, when the reservoir pressure hits the bubble point line and the small bubble of gas appears, the liquid and the bubble of gas have different density, so that why the term of critical point is the properties of liquid and gas are similar? Whether they merge so that the properties of liquid and gas are similar? I am sorry for my bad English Sir, i hope you understand what my question. Once more, thank you for advance.
The way of thinking about this is to consider the transition from the bubble point line to the dew point line. So the bubble of the second phase is first less dense than the surrounding fluid (bubble point) and then more dense (dew point). The only way this happens is a point where the properties of the two phases are similar.
This refers to the temperature and pressure at the surface - once the oil and gas is produced. Traditionally this is considered to be 1 atmosphere pressure (around 100 kPa) and a temperature of 60 degrees F (15.6 degrees Celsius).
In the Dry Gas example, How can we have the surface condition as low P and high T? Low P i can understand because no pressure but how is it possible that we have high T at the surface? Whwre is the high T coming from? Sorry, didn't get it there...
It seems that you misunderstood. The surface temperature is the same. It is just a problem with having one diagram and showing wet and dry gas conditions together. It is not high T for dry gas, but a rescaling of the temperature axis! See the second figure I show, where the reservoir and surface conditions remain fixed on the graph.
Good evening mr. Martin My name is WADERO MARTIN from Uganda a student of kyambogo University requesting for your help. We know the bubble point of natural gas is -162°C, the question is what happens to natural gas if u heat it above that value ?
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this is wonderful content. I am a Petroleum Engineering graduate and this gave me a lot more insight
As a geoscientist i would like to thank you. Very simple and understandable explanation, learned alot from this lecture which does NOT include any formulas, numbers etc...
This is by far the best lecture in have received on this subject. Thank you Sir
Excellent presentation.
Best method of explanation! Hats off!
Hi. Professor Martin, Thank you for making this video. its a very good explanation on phase behaviour. I enjoy it so much!
I am trying to pick up some ESP application skills. I feel more confident understanding PVT diagrams after watching your video. Thank you for posting this!
great video martin. Thank you
Great stuff Martin !
Clear explanation, thank you!
Great Explanation. Thanks
wonderful presentation
wow man this is amazing
Thank´s for this video, i study The Properties of Petroleum Fluids of McCain and very help me.
Good content
Thank you for interesting lecture!
Great content
Wonderful content!!! Thank you:-)
If we had a volatile oil and when produced had lots of associated gas, which was reinjected. How would that evolved on the phase diagram? The pressure would increase and could you reinject indefinitely? Or would there be a scenario where the oil would become oversaturated and a gas cap could form?
Overall material - oil - is removed from the reservoir, so the pressure will drop even if all the associated gas is re-injected. The overall composition of the reservoir will become more gas-like, so the phase diagram will change to reflect this. This means that we are likely to see a separate gas phase and the formation of a gas cap.
Thanks for this presentation. Still to come, wish if you kindly add your insight to the controversial "retrograde condensation" zone inside the PT two-phase envelope. How you present it to your students?
This is discussed in this video and the subsequent lecture 6. Retrograde condensation - the formation of a liquid from a gas when the pressure is dropped - is what happens in a gas condensate field. It is not controversial, but a consequence of the phase behaviour. I tend not to use the expression retrograde condensation as it usually causes confusion. I simply explain what happens for different types of hydrocarbon field.
@@BoffyBlunt Thanks for this elaboration. I will watch Lecture 6 of yours with interest.
Hi please what book do you use for reservior fluid properties
The best book to consult is McCain's Properties of Petroleum Fluids, www.amazon.com/Properties-Petroleum-Fluids-William-McCain/dp/0878143351
Thank you for the presentation Mr. Martin. This is so helpful content. I have a question sir, i still did not understand about the critical point term, i understand that when the reservoir pressure hits the bubble point line there is a small bubble of gas appears from the liquid. In my mind, when the reservoir pressure hits the bubble point line and the small bubble of gas appears, the liquid and the bubble of gas have different density, so that why the term of critical point is the properties of liquid and gas are similar? Whether they merge so that the properties of liquid and gas are similar?
I am sorry for my bad English Sir, i hope you understand what my question. Once more, thank you for advance.
The way of thinking about this is to consider the transition from the bubble point line to the dew point line. So the bubble of the second phase is first less dense than the surrounding fluid (bubble point) and then more dense (dew point). The only way this happens is a point where the properties of the two phases are similar.
@@BoffyBlunt aah I see Sir, thank you for answering my question Sir :)
Please what is meaning surface condition in minute 03.
This refers to the temperature and pressure at the surface - once the oil and gas is produced. Traditionally this is considered to be 1 atmosphere pressure (around 100 kPa) and a temperature of 60 degrees F (15.6 degrees Celsius).
Please how do you define GOR (gas oil ratio)
This is the ratio of the volume of gas to the volume of oil produced at the surface.
In the Dry Gas example, How can we have the surface condition as low P and high T? Low P i can understand because no pressure but how is it possible that we have high T at the surface? Whwre is the high T coming from? Sorry, didn't get it there...
It seems that you misunderstood. The surface temperature is the same. It is just a problem with having one diagram and showing wet and dry gas conditions together. It is not high T for dry gas, but a rescaling of the temperature axis! See the second figure I show, where the reservoir and surface conditions remain fixed on the graph.
Good evening mr. Martin
My name is WADERO MARTIN from Uganda a student of kyambogo University requesting for your help.
We know the bubble point of natural gas is -162°C, the question is what happens to natural gas if u heat it above that value ?
This is a super low temperature. Above this the liquid undergoes a phase change and you have gas, as you might expect.
EVANS ASANTE has come to watch this video
*I am really sorry but I could't understand your accent.. somewhat shrill in your voice*