A Large Rig Carrying Ship

[dr_gn]

Parsnip said:

dr_gn said:

I've never really understood how you can drill with a metal tube of such a huge aspect ratio. Does the tip of the tool rotate itself via hydraulics or something? Surely they dont turn the entire string of drilling pipes??

It is possible to rotate just the bit using a downhole motor - mud flow powers it - this is still done in a lot of scenarios - if you are trying to get away from vertical, you can use a motor with a bend in it to start building your angle for example.

Usually though, the whole string will rotate - this is the preferred way of doing things, it makes for better hole cleaning and reduces the risk of you getting stuck. The motor tuning it all is generally a beefy electric affair with massive torque, geared right down - depending on the bit you are using and the formation you are drilling, usually 60-180 RPM

The drillstring is pretty bendy over its length, but it is stabilised and much stiffer at the business end, so as long as you control the weight being put on the bit you shouldn't break anything - your string could weigh 100 tons+, but you are only drilling with 5 ton on the bit - if you put the whole 100+ tons on it, all sorts of stuff would go wrong. The only way you get away with it is because the majority of the pipe is in tension.

Interesting, thanks.

At one time, wasn't the world record for drilling length held by a BP(?) research centre somewhere near Poole Harbour?

[phumy]

Just thought i would bring this thread back to light again as i was in the same spot as last time, at the mouth of the saigon river and a new, or different "Rig Ship" had appeared and here are a couple of shots. By coincidence it appears to have the same owner as the rig ship which capsized only less than 24 hours ago up near Russia, sadly people have been lost. Link here:

http://www.bbc.co.uk/news/world-europe-16235095

Anyone have any info on this one, i believe the ship below is named the Deep Venturer and is possibly rented to the Russian company Arktikmorneftegazrazvedka (AMNGR).

[XJSJohn]

It or one very similar to it was in Singapore a few weeks ago ...

Realy should pop down to harbourfront and snap a few pictures of whatever big stuff is parked out in the Straits one of these days!

[Parsnip]

When it comes to silly big rigs being moved, Troll A definitely has it. Just looks ridiculous. Apparently the tallest structure that has ever been moved.

Also has the record for the deepest concert - down the bottom of one of the legs...

Edited by Parsnip on Tuesday 20th December 04:31

[robwilk]

By coincidence it appears to have the same owner as the rig ship which capsized only less than 24 hours ago up near Russia, sadly people have been lost. Link here:

http://www.bbc.co.uk/news/world-europe-16235095

Lived on this one in the north sea some time ago it was the accomodation on the Arco Thames off Yarmouth

[XJSJohn]

Parsnip said:

When it comes to silly big rigs being moved, Troll A definitely has it. Just looks ridiculous. Apparently the tallest structure that has ever been moved.

Also has the record for the deepest concert - down the bottom of one of the legs...

Edited by Parsnip on Tuesday 20th December 04:31

Bet there was some interesting stability calculations for the architect, and windage calculations for the tug!!!

Looks bonkers!

[Lefty]

XJSJohn said:

Parsnip said:

When it comes to silly big rigs being moved, Troll A definitely has it. Just looks ridiculous. Apparently the tallest structure that has ever been moved.

Also has the record for the deepest concert - down the bottom of one of the legs...

Edited by Parsnip on Tuesday 20th December 04:31

Bet there was some interesting stability calculations for the architect, and windage calculations for the tug!!!

Looks bonkers!

That's a fair size of GBS, wehat was the water depth at Troll?

They're a proper bd to decommission

[westtra]

Lefty said:

That's a fair size of GBS, wehat was the water depth at Troll?

They're a proper bd to decommission

300+ meters. there is a discovery/nat geo documentary of the build and float out i think.

[westtra]

http://www.youtube.com/watch?v=SIL_xuFgK4A&fea... - Richard Halmond engineering connections

Not the one i was thinking about though

[westtra]

Is that the one off newfoundland designed to be hit by icebergs?

[Taffer]

Lefty said:

XJSJohn said:

Parsnip said:

When it comes to silly big rigs being moved, Troll A definitely has it. Just looks ridiculous. Apparently the tallest structure that has ever been moved.

Also has the record for the deepest concert - down the bottom of one of the legs...

Edited by Parsnip on Tuesday 20th December 04:31

Bet there was some interesting stability calculations for the architect, and windage calculations for the tug!!!

Looks bonkers!

That's a fair size of GBS, wehat was the water depth at Troll?

They're a proper bd to decommission

The concrete legs had to be done as a continuous pour - IIRC correctly an hour of pouring added about 10cm to the leg height, so must have taken quite a while to complete!

[Taffer]

XJSJohn said:

It or one very similar to it was in Singapore a few weeks ago ...

Realy should pop down to harbourfront and snap a few pictures of whatever big stuff is parked out in the Straits one of these days!

That might have been the Noble Bully II - she was on sea trials near Singapore when we discharged cargo to her to test her water and cement lines. About $500m of ship and none of her hose connections were fitted properly:





Still, bit of a beast of a ship!

[Blatter]

Paddy_N_Murphy said:

westtra said:

Is that the one off newfoundland designed to be hit by icebergs?

Petro Canada have now got their ice management system down to a tee and so there is actually very little likelihood of the Hibernia being hit these days. This means that the new Hebron platform that is being planned as a gravity based structure is going to be around half the weight of Hibernia

[Mr Pies]

Jaw dropping! Keep up the awesome pictures!

[phumy]

Paddy_N_Murphy said:

Bump




http://gcaptain.com/dockwise-gains-million-heavy-l...

Which just about brings it to a full circle as that ship is the reason i started this thread, although the cargo is not the same.

[motomk]

How many Blue Marlins are there?! This one is in Melbourne now to offload the hull of a new defense ship for Oz.





Had to raid news.com.au for the pictures.

[phumy]

Good to see it earning a crust, its obviously very busy and getting about a bit, mind you i would expect it to have cost a fortune and its owners needs to get a return on its build cost. Great find though

[motomk]

The bridge part looks like one big wave and it will break off!!
Have they started building the big Gas processing ship for Northwest Australia?

[anonymous-user]

Am i missing something, why carry a ship with a ship? Doesn't the first one just float too? I imagine it might be a bit safer than a rough ocean tow, but those huge semi submersible carriers are hardly the last word in stability themselves in rough weather??

[vtgts300kw]

I think a lot of the oil/ gas ship looking things it carries aren't very good at being ships. They are just made to float arn't they?

And if I remember correctly, the Dockwise is very stable in high seas isn't it?