Drilling cores
When I was a kid.
Back in the sixties.
Dinosaurs walked the streets of Shreveport.
etc.
You'd see lots of cylinders that looked sort of like concrete. They were about 4 inches in diameter, about 8 inches long. People would use them for things like edging a lawn or flower bed. We kids thought they were cores you'd get when drilling an oil well. i.e. it's an intact chunk of what the rock under the earth looked like.
Now that I know more about the way drilling is done, that doesn't seem very likely.
Does anyone else remember what I'm talking about, and what they really were?
I've heard of taking core samples. Do they actually do that very often down into rock strata around here? I believe that the normal drilling practice grinds the rock into chips and flushes it out with drilling mud. How would you do something like this? I understand using a hole drill, but how do you get the core back to the surface?
Do they tend to recover rock chips from the mud for study?
How big are the pieces of rock that come up with the mud?
Back in the sixties.
Dinosaurs walked the streets of Shreveport.
etc.
You'd see lots of cylinders that looked sort of like concrete. They were about 4 inches in diameter, about 8 inches long. People would use them for things like edging a lawn or flower bed. We kids thought they were cores you'd get when drilling an oil well. i.e. it's an intact chunk of what the rock under the earth looked like.
Now that I know more about the way drilling is done, that doesn't seem very likely.
Does anyone else remember what I'm talking about, and what they really were?
I've heard of taking core samples. Do they actually do that very often down into rock strata around here? I believe that the normal drilling practice grinds the rock into chips and flushes it out with drilling mud. How would you do something like this? I understand using a hole drill, but how do you get the core back to the surface?
Do they tend to recover rock chips from the mud for study?
How big are the pieces of rock that come up with the mud?
Views: 45
Replies to This Discussion
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Permalink Reply by The_Baron on -
Very true.
I know CHK has taken full cores in the past. They do take sidewalls. But many times in their core area, they do neither.
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Permalink Reply by Mac Davis on
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Wow! That's got to be some expensive rock! Maybe I'll propose to my girlfriend with a core sample instead of a diamond. Where can I get hold of a core? 8-) And a jeweler who can make a mount for it?
However, I understand that it gives you better data. How long and wide do the cores tend to be?
Thanks for the info, baron.
And, by the way, what does "sand well" mean in this context?
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Permalink Reply by The_Baron on
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The cores are about 4 inches in diameter, the length is as long as you want. However samples tent to break into shorter sections as they are drilled, and samples are broken down into manageable lenght for transport after being extracted and examined on site.
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Permalink Reply by Mac Davis on
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Thanks again. How long do they tend to be in practice?
Could you really get a sample that was, for instance, 100 feet long? Does the core go up the center of the drill string, or does the coring bit have a sample chamber of some limited length?
I suppose if you were determined enough, you could always do multiple cores pulling up the bit, removing the sample, and drilling another core where you left off.
I don't mean to beat the subject to death, but I'm an engineer and suffer from curiosity. (I don't suffer from insanity, in fact, I enjoy it.)
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Permalink Reply by The_Baron on
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In theory you could dril an entire well using a coring bit, like they do for glacier samples etc. The question is why would you want to (other than that it would be cool to see). drilling cores is slow and expensive, we recently cored a well and it took an average of 12 minutes a foot for a 25 ft core. Also the length of each individual sample is limited by the equiptment involved as the sample canister can only hold so many feet. Cores are typically only taken from the target zone that is hopefully going to produce.
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Permalink Reply by sesport on
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WOW! I'm thinking leave them in the trays, put glass over the frame, wall art! (Might need some pretty strong anchors, though.) Or, donate to schools for science, especially for hands-on lessons for little kids. Might be good for home security, too. Like the type used in the movies "Home Alone," and its sequel. ha, ha
BTW, does the bird come with, or is there an extra charge?
Thanks for sharing, I've never seen that. :0) -
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Permalink Reply by Mac Davis on
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The bird is the rare Bretz's subterranean grosbeak. No one is quite sure how they burrow that deeply underground, or how they survive the coring and extraction process.
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Permalink Reply by sesport on
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MD - Then next time you might want to add a "lol" or a :-), otherwise your going to damage your street cred around here.
ha,ha,ha -
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