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Canada: Trillions of barrels of crude - so stop worrying

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Re: Trillions of barrels of crude - so stop worrying

Unread postby oil4u » Mon 10 Oct 2005, 21:01:33

Ok ...so to fill one of these things up at the pump would be about $4500.00 CDN? my next question is ...how long would that last in a typical working environment?
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Re: Trillions of barrels of crude - so stop worrying

Unread postby Kooka » Mon 10 Oct 2005, 22:40:07

$this->bbcode_second_pass_quote('fossilnut2', ' ')I blame the Beverly Hillbillies. "Uncle Jed 'shooting at some food and up from the ground came a bubbling crude".

Folks think he somehow punctured a membrane or liner and then it's just a matter of getting out the buckets and scooping out the oil :o


Since I know absolutely nothing about the specifics of drilling oil, is the article excerpt below actually too simplified?

Drilling Paradise DRY?
Science World, Oct 1, 2001 by Karen De Seve

Q What is oil and where does it come from?

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"An oil field isn't a huge cavern," Houseknecht says. Rather, oil droplets seep into pores or surface holes in rocks generally filled with water. Since oil is lighter than water, it floats upward and sometimes seeps up through Earth's surface. But nonporous rock layers also trap rising oil, creating an underground oil reservoir.

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Archaeologists think the Persians used oil they discovered gurgling above ground as glue and building mortar 6,000 years ago. In the 13th century, Venetian explorer Marco Polo reported seeing geysers spewing oil--traded by merchants and used for burning lamps--on his travels through the Middle East.

skip

Q How do you find oil?

Usually prospectors locate oil by testing porous rocks a foot or two beneath the soil or along rock outcroppings: If the rocks contain a lot of carbon, oil is likely to be nearby but deep underground. Today, geologists use supercomputers and seismic mapping, or sound waves that reflect differently off porous and nonporous rock layers, to create maps of underground oil pockets...
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Re: Trillions of barrels of crude - so stop worrying

Unread postby Antimatter » Tue 11 Oct 2005, 03:35:48

$this->bbcode_second_pass_quote('Peak_Modernity', 'I')t's electric drive and uses some kind of regenerative braking, but still must idle while being loaded. I have no idea how this is profitable, because you still need a loader (which also has the same size engine). You're burning tons a fuel before ever processing the tar/sands.


Do the math, those 360 ton haul trucks carry 300 barrels of bitumen per load. They could carry a load 1200 miles, drive back empty and still break even.
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Re: Trillions of barrels of crude - so stop worrying

Unread postby EnergySpin » Tue 11 Oct 2005, 07:54:50

$this->bbcode_second_pass_quote('fossilnut2', 'I') hum and haw and go looking for my wife for help.

Hope she is not reading this site :roll: ....
Goodpoint fn2 ... I never understood it, till I did my own homework ......
People think that you need to put a straw in the ground and it flows ... nut it ain't spice ....
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Re: Trillions of barrels of crude - so stop worrying

Unread postby fossilnut2 » Tue 11 Oct 2005, 13:54:50

Kooka, oil is in the rock itself. Pressure forces the oil out of the rock. That's more or less it in a nutshell.

A whole bunch of variable lead to how much pressure is needed to extract the oil...from the viscosity of the oil to the depth to the temperature to the type of porosity..makeup of the rock, etc.

The great advantage of the oil in the big fields of the Middle East is it is easy to pump out. There's LOTS of oil and it's easy to access. Oil saturated rock are sometimes near surface. (thus your Persian lamps). Most of the time oil must be drilled for 'through' non-oil bearing formations (sediment layers deposited in various geologic eras).

The nature of oil resevoirs is also why it's so difficult to judge reserves. There's not some giant dipstick that can be stuck into a hole to measure the height of the liquid. The oil is distributed in the rock and rock layers, etc. have 'iffy' borders. If a field is 'x' miles' wide and fossil fuels start at 3000 feet depths...what's happening at 6000 feet? If nothing, then if you go through another 1000 feet will there be another deposit? What about 20 miles to the East? To the West? Most folks understand the issue when they dig a water well....especially a drilled well. One hole will find water...20 feet over dry and 20 feet over again more water.

Many oilfields aren't closed because there isn't lots more oil to be pumped. They are closed because of the cost of capital needed to find the oil. As oil prices rise then finding more in closed or half-worked fields (especially in Texas/Oklahoma) becomes viable.
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Re: Trillions of barrels of crude - so stop worrying

Unread postby SilentE » Tue 11 Oct 2005, 14:28:57

$this->bbcode_second_pass_quote('fossilnut2', 'K')ooka, oil is in the rock itself. Pressure forces the oil out of the rock. That's more or less it in a nutshell.

A whole bunch of variable lead to how much pressure is needed to extract the oil...from the viscosity of the oil to the depth to the temperature to the type of porosity..makeup of the rock, etc.


How to "get it":

1. Think of a wet sponge.
2. Now think of a wet sponge sealed between your hands, getting squeezed, trapped under a lot of pressure.
3. Push a straw into the middle of the sponge, ripping into it. All the pressure forces the water up the straw.

Now, the hard parts:

4. Think of the phase, "trying to squeeze blood from a stone".

Last step...

5. The sponge is actually porous rock. The pressure is caused by the build-up of trapped gas inside the rock (and the weight of the earth above the rock). The rock doesn't compress much as the oil squirts out of it. Because rock is strong, eventually it stops compressing altogether and enough oil is forced from the rock that there's no more excess pressure - even if there's still someoil and gas left in the rock.
Last edited by SilentE on Wed 12 Oct 2005, 12:57:56, edited 1 time in total.
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Re: Trillions of barrels of crude - so stop worrying

Unread postby bobcousins » Tue 11 Oct 2005, 15:21:35

$this->bbcode_second_pass_quote('Kooka', ' ')or surface holes in rocks generally filled with water. Since oil is lighter than water, it floats upward and sometimes seeps up through Earth's surface. But nonporous rock layers also trap rising oil, creating an underground oil reservoir.


Looks ok to me. Common uses of the word reservoir imply an empty space used to store something, but there is nothing in the definition that says it must be an empty space. The sense of reservoir is that of "to keep or store".

I blame the phrase "solid rock". People think of solids like rocks and metals as impermeable, but as we know even solids are mostly empty space. It all depends on scale of course :)
It's all downhill from here
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Re: Trillions of barrels of crude - so stop worrying

Unread postby Kooka » Tue 11 Oct 2005, 21:43:18

Thanks fossilnut2 and SilentE :)
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Re: Trillions of barrels of crude - so stop worrying

Unread postby fossilnut2 » Wed 12 Oct 2005, 00:18:37

$this->bbcode_second_pass_quote('SilentE', '')$this->bbcode_second_pass_quote('fossilnut2', 'K')ooka, oil is in the rock itself. Pressure forces the oil out of the rock. That's more or less it in a nutshell.

A whole bunch of variable lead to how much pressure is needed to extract the oil...from the viscosity of the oil to the depth to the temperature to the type of porosity..makeup of the rock, etc.


How to "get it":

1. Think of a wet sponge.
2. Now think of a wet sponge sealed between your hands, getting squeezed, trapped under a lot of pressure.
3. Push a straw into the middle of the sponge, ripping into it. All the pressure forces the water up the straw.



Now, the hard parts:

4. Think of the phase, "trying to squeeze blood from a stone".

Last step...

5. The sponge is actually porous rock. The pressure is caused by the build-up of trapped gas inside the rock (and the weight of the earth above the rock). The rock doesn't compress much as the oil squirts out of it. Because rock is strong, eventually it stops compressing altogether and enough oil is forced from the rock that there's no more excess pressure - even if there's still [i]some[/i[oil and gas left in the rock.


That's a great description. I was purposely avoiding your sponge analogy because it can give a false sense of porosity, etc. Your part 4 'blood from a stone' solves the image issue.
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