2006-11-20 00:20:04 · 11 answers · asked by bad boy 1 in Science & Mathematics ➔ Engineering
Im sorry I've not got the sources for this but I've had experience on several rigs. For a start there are two main kinds of rigs.
For drilling a mobile rig is usually used (cos theres no garuntee of oil!). This is usually a large floating structure which is held in place with anchors. Barges carefully transport the massive anchors about 3-4km away then they're dropped and winched in until the line is taught. Were talking 20-30 ton anchors and 4 inch thick cable. The anchors have to be in a close to perfect triangle/square as possible.
This rig will drill down, hopefully strike oil and cap the well.
Then a production rig will be moved into that place. The most common technique these days is to have a huge hollow metal cylinder, capped at each end (i cant remember the design name, help me!) about 100-150m long 20-50m wide. This is dragged out to sea then pumped with water until it stands slightly above the surface. Its amazingly stable and can deflect strong currents.(some dynamics principals I can't remember). All the production lines are protected very well inside the cylinder. Sometimes anchorage is used but its rarely neccessary.
The production unit/platform is then neatly plonked ontop of the cylinder.
In the olden days most offshore oil was close enough to the surface you could built a structure from the sea bed up. This almost never happens anymore.
Sorry I can't be more precise!
2006-11-23 10:01:43 · answer #1 · answered by Matty T 2 · 0⤊ 0⤋
How Are Oil Rigs Anchored
2017-01-19 08:32:22 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Numerous anchor guides and also GPS positioning using numerous motors attached to the undersea framework to keep it in one position. Oil rigs are a bit like icebergs really as most of the structure is underwater. Therefore that limits the effects of rough seas and high winds etc but the effect of undersea currents are increased, so the anchors and/or GPS positioning counteract this.
2006-11-20 00:26:07 · answer #3 · answered by minisandmoto 2 · 0⤊ 0⤋
I t depends If the water is relatively shallow or the rig is supersized then the legs do indeed touch the seabed. Other rigs actually float with massive partly filed pontoons on their feet to keep the rig steady but boyant.They act like a keel on a ship. Either way they will be acnchored to the seabed!
2006-11-20 01:19:20 · answer #4 · answered by acontractornow 2 · 0⤊ 0⤋
In the old days they were build atop platforms secured to the sea floor, but now they are creating oil rigs that are mobile (basically they are just big ships) but there designed in such a way that they as secure as the platformed rigs.
2006-11-20 00:33:45 · answer #5 · answered by dark.crusade 2 · 0⤊ 0⤋
The sea bed. Depends on the depth of water. They can either stand on the sea bed itself or if it is very deep then they are anchored to the bed. This is why deep sea divers get payed so much. would you like diving at 300 ft to maintain the legs!
2006-11-20 00:21:54 · answer #6 · answered by Rob S 3 · 0⤊ 0⤋
Some are anchored to the sea bed others use Dynamic Positioning to keep them in place.
2006-11-20 12:39:32 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Sea Floor
2006-11-20 00:27:44 · answer #8 · answered by Kev C 2 · 0⤊ 0⤋
sometimes they sink a large ship to the bottom and build the rig ontop of that with concrete supports to keep stability
2006-11-20 00:22:19 · answer #9 · answered by think outside the box 2 · 0⤊ 0⤋
i really dont have any idea, but im guessing that it would either have to have some serious weight on, plus dosent a pipe run down the center into the ground which would stabilize it even more
2006-11-20 00:29:24 · answer #10 · answered by bshelby2121 6 · 0⤊ 0⤋