- #1
ahmed11
- 83
- 0
if we have a vacuumed tube inserted into a reservoir of 10,000psi will the oil rise up in the vacuum tube of will it stay in place because there is no Δp?
What makes you say that there is no Δp?ahmed11 said:if we have a vacuumed tube inserted into a reservoir of 10,000psi will the oil rise up in the vacuum tube of will it stay in place because there is no Δp?
if the tube is vaccumed and then connected to the reservoir, won't that mean that there is no delta p inside the tube?jbriggs444 said:What makes you say that there is no Δp?
Yes, there is no pressure differential through the evacuated portion of the tube. So there is no net force on anything within the evacuated portion of the tube. But then there is nothing in the evacuated portion of the tube.ahmed11 said:if the tube is vaccumed and then connected to the reservoir, won't that mean that there is no delta p inside the tube?
So even if the tube have zero pressure inside and oil have high pressure acting on it from overburden pressure, the oil will still flow in the vacuum tube right?jbriggs444 said:Yes, there is no pressure differential through the evacuated portion of the tube. So there is no net force on anything within the evacuated portion of the tube. But then there is nothing in the evacuated portion of the tube.
There is a pressure differential between a point somewhere within the pressurized oil and somewhere within the evacuated tube. And there is oil in the region between. That oil will be under a net force.
So now you have oil that has oozed (and is still oozing) out of the material and into the tube. This motion is sustained by a pressure gradient. High pressure in the bulk of the [nearly unmoving] oil deep within the material, lower pressure nearer the inlet to the tube and zero pressure at the surface of the oil within the tube.ahmed11 said:So even if the tube have zero pressure inside and oil have high pressure acting on it from overburden pressure, the oil will still flow in the vacuum tube right?
I'd really appreciate it if you could explain more as this is really confusing me.
So oil will move to the inlet of the tube but not inside the tube itself?jbriggs444 said:So now you have oil that has oozed (and is still oozing) out of the material and into the tube. This motion is sustained by a pressure gradient. High pressure in the bulk of the [nearly unmoving] oil deep within the material, lower pressure nearer the inlet to the tube and zero pressure at the surface of the oil within the tube.
Every little bit of oil is under a pressure differential that accounts for its movement against viscous resistance (and against inertia in the case of higher flow rates).
Every little bit of oil is under a pressure gradient that accounts for its motion. Once oil enters the tube, there is a pressure gradient (within the oil) within the tube.ahmed11 said:So oil will move to the inlet of the tube but not inside the tube itself?
I disagree with this calculation. If the pressure at depth is 10000 psi, then this is 1440000 lb/ft^2. The density of oil is about 50 lb/ft^3. So the height that the oil could rise in the production string (above the depth of the well completion in the production formation) would be 1440000/50 = 28800 ft. So that pressure would be more than enough for the oil to exert substantial positive pressure at the surface (vacuum or no vacuum). A reservoir at 6000 ft and 10000 psi pressure would be considered highly over-pressured (i.e., above hydrostatic).Khashishi said:10000 psi = 703000 mmH20 ~ 879000 mmpetroleum
So, petroleum from a reservoir at 10000 psi will rise about 879 meters in an evacuated tube. It looks like the average oil well is 6000 feet deep, so, we wouldn't be able to get it at 10000 psi with vacuum alone.
Your position is incorrect. Vacuum will not stop the influx of oil.ahmed11 said:thank you so much for your reply guys and sorry for replying late but one last thing.
what I'm actually arguing with my classmates and trying to prove is that as long as there is no air allowed in the wellbore while drilling and drilling under vacuum conditions by sealing the top of the well before drilling that this will not allow a kick in the well as the pressure won't react with vacuum. there will be no influx if there is no air, so what I am saying is that oil won't reach the top and blowout if we're drilling with vacuum?
The flaw in your logic is that there can be a discontinuity in pressure at the interface between the production string and the formation. The two pressures must match, so a driving force will be present for the flow of fluid within the formation to (and through) the interface. Your classmates are correct, and, sorry to say, you are wrong.ahmed11 said:thank you so much for your reply guys and sorry for replying late but one last thing.
what I'm actually arguing with my classmates and trying to prove is that as long as there is no air allowed in the wellbore while drilling and drilling under vacuum conditions by sealing the top of the well before drilling that this will not allow a kick in the well as the pressure won't react with vacuum. there will be no influx if there is no air, so what I am saying is that oil won't reach the top and blowout if we're drilling with vacuum?
i know I'm asking a lot but it has been an ongoing discussion in class and we still can't settle on the right answer
Hydrocarbons are organic compounds made up of hydrogen and carbon atoms. They are the main components of crude oil, which is extracted from underground reservoirs known as oil wells. Hydrocarbons are responsible for the energy and fuel properties of crude oil.
Hydrocarbons can move within oil wells through a process called migration. This occurs when the hydrocarbons are under pressure and are forced to move through tiny spaces in the rock layers. The movement is typically from areas of high pressure to lower pressure zones.
Yes, hydrocarbons can move from areas of high pressure to vacuum zones within oil wells. This is because the vacuum zones have even lower pressure than other areas of the well, creating a gradient that allows for the movement of hydrocarbons.
The movement of hydrocarbons within oil wells can be influenced by a variety of factors, such as the permeability of the rock layers, the pressure and temperature of the well, and the density and viscosity of the hydrocarbons themselves. Additionally, the presence of faults or fractures in the rock layers can also impact the movement of hydrocarbons.
The movement of hydrocarbons within oil wells is crucial for oil production. Without the ability to migrate to areas of lower pressure, the hydrocarbons would remain trapped in the reservoir and would not be able to flow to the surface. Therefore, understanding and managing the movement of hydrocarbons is essential for successful oil production.