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Gold/Mining/Energy : Strictly: Drilling and oil-field services -- Ignore unavailable to you. Want to Upgrade?


To: JGreg who wrote (24752)6/25/1998 5:25:00 PM
From: Aggie  Read Replies (1) | Respond to of 95453
 
JGreg, Howdy,

Don't know where Big Dog is, but I'll take a stab at it.

A jackup is a MODU, or mobile offshore drilling unit. It is a self contained barge which can be towed, floating, to a location and "jacked up" to a working height to operate, whether it's by itself (exploration drilling) or next to an existing offshore structure such as a platform. In that case, the drilling package would be "cantilevered" over the production platform so that the work could proceed on the well.

A platform rig is a rig which is designed to be mounted directly on the platform. In essence, it is a land rig with a very small "footprint", so that it's components can efficiently occupy the limited space available on the platform.

Some of these platform rigs are self-erecting, which is to say that they have the craneage as part of their design which allows them to be moved from platform to platform, as needed.

Hope this answers your question.

Regards,

Aggie



To: JGreg who wrote (24752)6/25/1998 9:09:00 PM
From: Big Dog  Respond to of 95453
 
A platform rig sits on top of a fixed platform and drilles from the platform. It is not mobile -- it does not float. It is moved to location by barges. Generally it drills development wells and does workovers. Platform rigs can remain on a platform for many years.

Jackups have legs that rest on the sea floor then are retracted when done so the rig can be towed off to another site. They drill exploration wells, but can also do development drilling and workovers.

big