Friday, May 25, 2007

Semi vs Tender rig

Now I know why we can feel the rig movement due to the heave more on a tender rig compared to a semi (semi sub or semi tender). It's due to the ballast control. I knew that a semi sub rig like Ocean Rover and semi tender rig like West Alliance or West Berani has a ballast control, to compensate the heave and minimize the rig movement. But I've never realized that a tender rig doesn't have any ballast control. So that's why it's sooo different.

And that's why also, in West Berani and West Alliance, they can use an access ramp (bridge from tender to platform) which is convenience, with spiral stairs and sorts, because the rig movement is minimal. The same reason also why on a tender, we cannot use those kind of access ramp, but a widow maker, or so we call it, which is a lot more dangerous in bad weather where the heave is very high. Due to lack of ballast control from the tender, the rig is moving accordingly to the heave. In that kind of situation, I prefer to stay on the fix platform, eventhough the accomodation and food is down there on the moving tender.

Watching the tender movement from a fix platform will give you a chill on how this thing can move. Just like a boat on a rough weather. It doesn't care how big is the tender, it will still move violently. And imagine you have to climb a ladder down to that kind of moving rig. Or even jump. Man...I really hope I will never ever come across those kind of rig again.

49 comments:

Mohammad said...

Hey Dian,Thats really threatening!
I know this is little late for commenting this post,but I need your help.
I want to know what is tender.when there are fix platforms with drilling rig installed on them so why we use tender and fix plat seperatley?

Mohammad said...
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Ricardo said...

Reply from OilOnline.com:
Mr. Christie: Thank you for inquiry to OilOnline.com. A tender rig is typically a support vessel that serves in support of a drilling rig. It basically acts as a platform for supplies that is stationed alongside a drilling rig from which the rig will work off of to reduce the loads on the actual rig. Tender rigs can be either jackup style (like a lift boat), semisubmersible or submersible.

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Andres Alayon Cisneros said...

Hi Ricardo,

I see that you have good knowledge of the tender rig and I would like to ask you, How the drilling package on the platform is able to reach the conductors that will be intervened? How is it positioned to the new well to be drilled? Do the drilling package has to be rigged down and then rig it up on the new conductor or it can be moved back and forward and laterally without rigging it down?

Andres Alayon Cisneros said...

Hi Ricardo,

I see that you have good knowledge of the tender rig and I would like to ask you, How the drilling package on the platform is able to reach the conductors that will be intervened? How is it positioned to the new well to be drilled? Do the drilling package has to be rigged down and then rig it up on the new conductor or it can be moved back and forward and laterally without rigging it down?