A. PavilionType of platforms in general can be classified into two groups, namely1. Fixed platforms2. Mobile platform
1. Fixed PlatformFixed platforms are "mainland" artificial. Rigs are drilling platforms until the operation is complete. All equipment and material needs are in the platform. Fixed platforms are widely used for drilling operations in shallow seas, such as the North Sea Java. But now have been developed for deep ocean, for example in the North Sea.
2. Mobile PlatformsMobile platform is subdivided Bottom Supporting Platforms and Floating Platform.a. Bottom Supported PlatformsThe types of offshore drilling platforms are included in the category Bottom Supported Platforms includea. Drilling Bargeb. Sub-mersible Platformc. Jack Up Platforms
a. Drilling BargeDrilling barge operated for drilling in the area of marsh or the sea is very shallow. Barge was sitting at the bottom of marshes or the sea, stability is not affected by the weather and tides.b. SubmersibleReal submersible floating platform. When operated in shallow seas, submersible is seated on the sea floor and serves as a drilling barge.c. Jack-UpForm a kind of jack-up barge, bulky and not have its own propeller, so to go to the location to be pulled by tugs. Jack-up is equipped with legs that consists of three, four, five feet or more. In the drilling position, the ship lifted on their feet, high enough above the water well above the reach of the waves. The depth of the sea in accordance with long legs so limited their use. Jack-up is stable, not affected by the weather, currents and waves. All equipment on board. In the drilling of development, usually before the drilling starts first fitted jacket, and then installed conductor and ground. In exploration drilling is typically used mudline suspension, and the mud line suspension chassis greeted upward until the platform.
b. Floating PlatformThe types of offshore drilling platforms that fall under this category include the Floating Platform Semi-submersible platform, and Drill Ship.- SemisubmersibleSemisubmersiible sort of boat-shaped and generally does not have its own propeller, so to get to the location to be pulled by tugs. Because it floats, so it can be influenced currents, waves and tides. To overcome these problems must dijangkar. Anchoring system there are two kinds, namely:· Conventional Mooring System· Dinamic Positioning
For completion wells can be done:· By Christmastree on Platform· By Christmastree on the seabed.
- Drill ShipDrill ship is fully ship shape and comes with its own propeller. Because it floats, so strongly influenced by currents, waves and tides. To overcome these effects should dijangkar like submarsible. BOP installed on the seabed and for completion wells can be made:
a) Christmastree on the seabed
b) Christmastree on platform
b) Christmastree on platform