OT. WAY OT, Engineering Problem. Need some help |
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OT. WAY OT, Engineering Problem. Need some help |
jfort |
Aug 27 2008, 10:55 AM
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#1
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Senior Member Group: Members Posts: 1,137 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
My son and I have a real problem and we need some help. My son is a licensed blaster. He has been asked to stimulate oil wells with dynamite. I am trying to help him. In short, we will fabricate a "torpedo." Currently, we are thinking of using a 5' length of 1.5" PVC with the down end made into a point. The torpedo will be filled with 2 sticks of dynamite and filled with as dense a sand/gravel as we can find. It will be dropped down a 5" pipe filled with water. It is estimated that it is 640' to the bottom. Can you help me calculate how long it will take the torpedo to reach the bottom? (We need to make sure it gets to the bottom before the fuse ignites the dynamite!!) I am sure the efficiency through the water, drag, is an important and not known for sure variable, but perhaps there is a range that would get us close enough.
Any guidance or leads would be most appreciated. |
YksKrad |
Aug 28 2008, 04:16 PM
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#2
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Member Group: Members Posts: 72 Joined: 14-February 05 From: Rolla, MO Member No.: 3,602 Region Association: Upper MidWest |
I'm only an engineering student, and an Arch. E. major at that rate, but the pressure at depth would be dependent on material you're in which won't be pure water and likely won't be consistent over that range, so I would not trust any form of pressure trigger...
However time delay and fuses are a bad idea as well since you have no guarantee that the device will not get jammed upon the way down, or that it will travel in any predictable way (try dropping a nail onto a quarter at the bottom of a bucket of water... You'll find it's very difficult, likewise you're likely going to hit the walls of the well in no predictable manor...) So based on those two assumptions/observations... Manual detonation...physical depth meter.... On a side note... Don't they usually pump steam in several parallel side wells drilled in the vicinity nowadays, or is that only in certain situations(I could have sworn I had heard something about that)? |
ArtechnikA |
Aug 28 2008, 04:31 PM
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#3
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
On a side note... Don't they usually pump steam in several parallel side wells drilled in the vicinity nowadays, or is that only in certain situations(I could have sworn I had heard something about that)? 'Usually' is awfully general... Steam injection is a common method of secondary recovery, but it's useful in only some applications. Steam is expensive to make - if it costs more to make the steam than the oil is worth, it's a bad tradeoff... waterflood is a good method - you make some number of holes around the 'producing' well (a 5-spot waterflood is very common - 4 corners of a square for water, with the producer in the middle) and pump water down into the field. The water sinks below the oil and forces it up and into the producing well. Nice if you have a good supply of water, and it's pretty common to hit water before you hit oil, which is where the cementing comes into play... but fracturing also works sometimes, where the oil is bound up in or behind strata. If you break up the big rock, you make channels for the oil to flow through. That sounds to me as if it's at least part of what's in play here. |
YksKrad |
Aug 28 2008, 05:12 PM
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#4
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Member Group: Members Posts: 72 Joined: 14-February 05 From: Rolla, MO Member No.: 3,602 Region Association: Upper MidWest |
On a side note... Don't they usually pump steam in several parallel side wells drilled in the vicinity nowadays, or is that only in certain situations(I could have sworn I had heard something about that)? 'Usually' is awfully general... Steam injection is a common method of secondary recovery, but it's useful in only some applications. Steam is expensive to make - if it costs more to make the steam than the oil is worth, it's a bad tradeoff... waterflood is a good method - you make some number of holes around the 'producing' well (a 5-spot waterflood is very common - 4 corners of a square for water, with the producer in the middle) and pump water down into the field. The water sinks below the oil and forces it up and into the producing well. Nice if you have a good supply of water, and it's pretty common to hit water before you hit oil, which is where the cementing comes into play... but fracturing also works sometimes, where the oil is bound up in or behind strata. If you break up the big rock, you make channels for the oil to flow through. That sounds to me as if it's at least part of what's in play here. Thanks for the information!!! (IMG:style_emoticons/default/biggrin.gif) |
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