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Old 07-13-2012, 07:53 PM   #4101
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Quote:
Originally Posted by CamaroSkooter View Post
Sorry to get off topic, but you know me. This stuff really intrigues me





Hmmm... a 7-character license plate "SS ENGNR" maybe
how bout SSE 4 2SS <<, seven characters...

LOL, I knew if we ever got on the subject it would... It's the engineering side of you... which is most of you... most any subject is open for discussion in here as well... Though we may have to use our available local experts for some of the subject content accuracies... BRUCEMIKERUSSKYLEJUSTINOTHERMIKEDOUGGLEN etc....

Here a trivia question... Drill bit is on the drill pipe (string)... drill pipe (string) spins to the right and with weight applied downward... the drill bit goes down...

Now, I want to do directional hole... I want to go a specific direction with that hole... say.... >>>> way....

How is this accomplished... Think outside the box...


Or... The well head is spudded in.... run into the sea floor... then they drill out the 20 inch section, and run 20 inch casing... Once that is done, they cement it... basically making the well head and casing one with the earth... So... The rig floats... It heaves, it rolls, etc...

We run the BOP stack to the sea floor and latch it up to the wellhead, on marine riser... which is 5/8 to 3/4 inch wall pipe 21 1/4 ID, and is in 50 foot joints... So... we have a solid wellhead, a stack latched up to it, and essentially a solid line from the rig to the seafloor... What allows the rig to move up and down relative the seafloor without tearing the stack off the wellhead... Bear in mind the riser can not flex as this would cause the aforementioned drill string to rub against it, keyslotting it, and eventually to rub through it causing a loss of control of the well formation pressures..

This is all strictly for fun... and unlike Pete, there will be no test... and it's not any kind of rocket science stuff as proven by the fact that I can do it...

Just dont over think it...as I tell my trainees all the time...
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Old 07-13-2012, 07:56 PM   #4102
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... most any subject is open for discussion in here as well...
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Old 07-13-2012, 08:09 PM   #4103
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I'll post down here in the little box since it appears I'll have to wait a month for whatever Pq posted to download
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Old 07-13-2012, 08:19 PM   #4104
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I'll post down here in the little box since it appears I'll have to wait a month for whatever Pq posted to download
You can't see that pic?
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Old 07-13-2012, 08:20 PM   #4105
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Just dont over think it...as I tell my trainees all the time...
I'll take a stab at it... the answer to #1 is..... Potato's ?

But seriously, my first thought would be to create tension on one side of the drill pipe.
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Old 07-13-2012, 08:29 PM   #4106
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You can't see that pic?
I can now... It took about ten minutes to download...

Quote:
Originally Posted by Mr Twisty View Post
I'll take a stab at it... the answer to #1 is..... Potato's ?

But seriously, my first thought would be to create tension on one side of the drill pipe.
But the pipe in this case is over 10,000 feet long, mostly straight down... or it's more than 2000 PQ's... laid end to end... or about the distance his car can cover in thirteen minutes...

Stress on one side of the pipe could cause it to bend, but how do you rotate the pipe, turning the bit, and maintain the tension on one side of the pipe...
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Old 07-13-2012, 08:34 PM   #4107
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If you can't bend the pipe, then you'll have to change the angle of the rig to point it like a gun barrel.

How deep is it to the sea floor?

How much does 10,000' of drill pipe weigh?

Common sense says once you have thousands of pounds of pipe hanging, no matter the direction, it's gonna say, "Screw this, I'm heading toward the center of gravity!" (straight down)
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Old 07-13-2012, 08:42 PM   #4108
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... or it's more than 2000 PQ's... laid end to end...


Not much more either. hahaha

I was always amazed at how they could do that without breaking and bending many pipes.
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Old 07-13-2012, 08:54 PM   #4109
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If you can't bend the pipe, then you'll have to change the angle of the rig to point it like a gun barrel.

How deep is it to the sea floor?

How much does 10,000' of drill pipe weigh?

Common sense says once you have thousands of pounds of pipe hanging, no matter the direction, it's gonna say, "Screw this, I'm heading toward the center of gravity!" (straight down)
The pipe is quite flexible... and it's very heavy... A joint of pipe can weight from 20to over 150 lbs a foot... depending on the type of pipe, drill pipe, drill collars, or hevi-weight... When we get to the bottom of this hole with the various styles and sizes of pipe, we are roughly running a 420,000 lb hook weight... We have rigs with a 2.5 million lb hook weight rating...

On this particular well, it's about 400 feet to the ocean floor... This is quite shallow water for us... This well we are on the total depth is 16,200 + feet, while the TVD, or total vertical depth is only around 12,000. This indicates there is some directional drilling going on... but again, the pipe is spinning, the rig is not tilted and yes the pipe wants to head to the center of gravity... so.... ???



I've actually been on rigs in shallow gas fields where the TVD was less then 5000' but we would run over 15,000 feet of pipe in the hole... Horizontal drilling...
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Old 07-13-2012, 09:10 PM   #4110
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Ok... here's what you do... you mount a big ass't gyroscope above the drill head...

Ima hafta think on this... how DO you make a pipe bow a certain direction... you can make a bow bend by adding tension on one side with a bow string... but you don't have enough space to work with.

DAM YOU! I was gonna go to bed early tonight, too LOL
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Old 07-13-2012, 09:15 PM   #4111
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I'm with you. Drilling is one those things I've never been able to wrap my brain around. Especially horizontal!!
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Old 07-13-2012, 09:15 PM   #4112
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Really cool btw, thanks for Ed-u-ma-kating us.
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Old 07-13-2012, 09:22 PM   #4113
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My son worked on a crew installing underground fiber-optic cable. They had a drilling machine that could follow a prescribed route underground, and come back up at the exact point they needed..... crazy
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Old 07-13-2012, 09:31 PM   #4114
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When you blow mud in the hole, does it come out the center of the drill head, or can the drill head be lubed on one side more than the other? If you could pin-point the mud, you could conceivably make the drill head cut the higher lubed area faster, making it turn eventually... maybe... dammit

BTW, I see mud wagons everywhere in Oklahoma... where do you get your mud? Can you recycle it?
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Old 07-13-2012, 09:46 PM   #4115
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My blind guess is that there's a specialized drill "bit" that uses the pressure from the drilling slurry to hydraulically alter the angle of deflection of the drill "bit." Maybe use some kind of flexible collars that are required to be put between sections of pipe, but I'm not sure how you'd control where those collars allow flex and where hey don't allow flex.

But beyond that, I haven't got the foggiest

I was originally going to say maybe there's a GPS controlled drill bit, but I've always wondered how accurate GPS would be 10,000 feet below the sea floor when I can't get my darn phone to pick up a signal just from inside my car
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Old 07-13-2012, 10:11 PM   #4116
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That's a good point.... how do they even know they're drilling is offset?

.... sounds like a conspiracy theory to me
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Old 07-13-2012, 10:19 PM   #4117
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Ok... try this on for size...

pull the bit out... replace it with some sort of hydraulic jet (like a water hose sprayer)... run it back down and blast the piss out of the bottom of the hole at an angle, enough to offset the bottom. Then when the bit is run back down, it's going into a bit of a bind, causing it to try to follow the new path that was jetted into the bottom.

.... So... what if we accidentally stumble onto a better mouse-trap here... you gonna share in the profits, Mr Halliburton?
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Old 07-13-2012, 10:26 PM   #4118
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Ball Bearings ..... It's all done with Ball Bearings these days......
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Old 07-14-2012, 01:13 AM   #4119
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Transformers.
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Old 07-14-2012, 02:29 AM   #4120
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You guys are good... I see some patents coming.

Here are two directional wellbores from the same top hole. TVD or Total Vertical Depth is only 3000' but the wellbore is 11,000' long.


Name:  Capture1.JPG
Views: 78
Size:  30.0 KB

Name:  Capture5.jpg
Views: 78
Size:  41.6 KB
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Old 07-14-2012, 04:03 AM   #4121
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You use a directional motor to drill directional wells. The motor has a bend on the bottom 4 feet anywhere from 1-3 deg. The bit also spins from the gallon per minute pumped threw the string. You can rotate the bit only by pumping mud threw it. This is how you get your curve in the hole. You just point the bend where you want it to go. ( it's way more complicated then this). And if you want it to go straight in the direction that you have started it going you rotate the bit and the string at the same time.
The way they know where the bend is facing is called a WMD tool. It's works off of a magnetic tool face. They take surveys every 30 feet and plot it on a map. This is how they know where they are every time. It is all much more complicated then this but I tried to put it short and sweet.
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Old 07-14-2012, 04:21 AM   #4122
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Bent sub and downhole motor...


Edit: I see you edited and explained...
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Old 07-14-2012, 04:22 AM   #4123
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This shows the difference between just sliding with a directional motor and rotating with a directional motor.
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Old 07-14-2012, 06:41 AM   #4124
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I think I got it.... But you'll need 2 miles of rope, ball bearings and a midget.
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Old 07-14-2012, 07:17 AM   #4125
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I think I got it.... But you'll need 2 miles of rope, ball bearings and a midget.
So we have PQ... Check...
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