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Started By
Message
Stupid Question Probably but...
Posted on 6/20/10 at 5:14 pm
Posted on 6/20/10 at 5:14 pm
...if the oil is coming out of the ground is it not leaving a void in the resvoir. If so, why is the pressure at 5000ft not enough to stop the oil from leaking out. I would think water would be going in the pipe.
I guess I dont understand the physics behind what is going on but I would like for someone to explain it to me.
I guess I dont understand the physics behind what is going on but I would like for someone to explain it to me.
4
Posted on 6/20/10 at 5:33 pm to BamaScoop
Formation pressure>head pressure (water depth)
Posted on 6/20/10 at 9:43 pm to BamaScoop
quote:
Stupid Question Probably
Yes , it is.
Posted on 6/20/10 at 10:35 pm to BamaScoop
quote:
.if the oil is coming out of the ground is it not leaving a void in the resvoir
In this case, a lot of the pressure is coming probably coming from compressed natural gas both dissolved in the oil and present in a gas cap.
as it empties, the gas expands.
Also, the ground above the reservoir might be subsiding, giving the weight of the ground above it to the pressure of the reservior.
This post was edited on 6/20/10 at 10:41 pm
Posted on 6/20/10 at 10:37 pm to BamaScoop
quote:
If so, why is the pressure at 5000ft not enough to stop the oil from leaking out. I would think water would be going in the pipe.
Its coming out at around 15 thousand psi.
water pressure at that depth isn't that much higher than 2k psi.
Posted on 6/20/10 at 10:38 pm to Volvagia
quote:
Formation pressure>head pressure (water depth)
The pressure from the formation makes 5000ft pressure miniscule.........
The Pressure in the ground at the depths they were drilling was like 10x what it takes to launch a rocket at points.
This post was edited on 6/20/10 at 10:40 pm
Posted on 6/20/10 at 10:40 pm to L S Usetheforce
It's like pissing in the wind..........the depth pressure provides some resistance but its still gonna come out.
This post was edited on 6/20/10 at 10:41 pm
Posted on 6/20/10 at 10:43 pm to L S Usetheforce
Scoop spend the 7 mins..........and watch this............great video.........doesn't explain pressure but gives you idea of what you are dealing with and measures taken to deal with the pressure.....
[link=(
https://www.youtube.com/watch?v=9PNMDV2v9oA)]LINK[/link]
After you watch that think about bottom hole pressures at the end of that bit at 27000 psi at points..........then add temperatures of 400 degrees F...........
[link=(
https://www.youtube.com/watch?v=9PNMDV2v9oA)]LINK[/link]
After you watch that think about bottom hole pressures at the end of that bit at 27000 psi at points..........then add temperatures of 400 degrees F...........
This post was edited on 6/20/10 at 10:52 pm
Posted on 6/21/10 at 7:19 am to Volvagia
quote:no, the formation pressure and pressure at the seafloor is different. more like flowing out at ~3000 psi vs 2500psi hydrostatic back pressure (which is neglected w/ the top hat cause its like a vaccume
Its coming out at around 15 thousand psi.
Posted on 6/21/10 at 7:26 am to mylsuhat
quote:
Its coming out at around 15 thousand psi.
water pressure at that depth isn't that much higher than 2k psi.
Formation pressure at depth was around 15k psi but thats not what the differential at the wellhead is. The formation fluid (oil,gas, & water) at those depths is under tremendous pressure due to the overburden of rocks above it. That pressure is being relieved somehwat due to the oil&gas flowing out but there is still a plentiful supply of formation pressure pushing it out and its still much higher than the pressure of the water column at the wellhead.
This post was edited on 6/21/10 at 7:31 am
Posted on 6/21/10 at 9:08 am to lsugradman
I appreciate the input. I no very little about engineering.
Posted on 6/21/10 at 9:09 am to BamaScoop
quote:
I no very little about engineering.
quote:
Alabama Fan
yeah.. we figured that
Posted on 6/21/10 at 8:29 pm to Volvagia
quote:
In this case, a lot of the pressure is coming probably coming from compressed natural gas both dissolved in the oil and present in a gas cap.
as it empties, the gas expands.
Like what happens when you open a coke. A talking head tried to explain this once and got blasted for it by the ignorant masses.
Posted on 6/21/10 at 9:31 pm to foshizzle
quote:
A talking head tried to explain this once and got blasted for it by the ignorant masses.
On what grounds?
Posted on 6/21/10 at 9:36 pm to Volvagia
quote:
On what grounds?
quote:
got blasted for it by the ignorant masses.
On not being ignorant I guess.
Posted on 6/21/10 at 9:39 pm to C
Would like to know the degree and brand of stupidty though.
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