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RIG TYPES

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Rig Types

Can be broadly divided into 6 different types

•Land•Submersible•Jack-up•Platform•Semi-submersible•Drill Ship.

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Land Rigs

They typically come in light, medium or heavy configurationIs moved using heavy trucks and cranes Small rigs may only drill to a few thousand feet.But larger ones are capable of 20000 and more

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Submersible / Barge

Tend to drill in fairly shallow water. They flood the legs with water and submerge. Some of the rig is above water, and crews drill from that location. Swamp type, river and inland bay areas are very suitable for some of these rigsSpecially constructed submersibles are also used in extremely cold areas. Typical water depths are 20 feet

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Jack-up Rigs

Have lattice legs which can be hoisted and lowered at will.They are hoisted and the rig is either towed or transported by ship.When in location, the legs are lowered to the sea-bed. Jack-up rigs can drill in water depths up to 400ft

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Platform / Tender Rigs

Are immobile once built.However, they drill several wells from the one location. They can be tender assisted.Three types of Platform are:Steel Jacket, Caisson Type and Concrete Gravity

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Semi-submersible

Has hollow legs and pontoons. Like the submersible, the legs are also flooded However, anchors and/or Thrusters and Positioners keep the rig in position, When thrusters are used, it is called Dynamic Positioning (computer controlled), This system steadies the rig over the hole.Crews use a Subsea Blowout control preventers

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Drill Ship

Are self propelled, floating offshore drill units, They use a Subsea Blowout control system similar to Semi-submersibles.A template which has holes drilled though it is fitted to the sea bed This is where the drilling is to take place.The Semi-submersible and Drillships align themselves over these templatesThen they commence drilling.

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Rig Types Summary

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Typical Land Rig Organization Chart• Rig Superintendent

LPT Leader

Assistant Rig Sup

Chief Electrician Chief Mechanic Drillers Labour Pusher Medic Radio Operator

Electrician Mechanic

Trainee Trainee

Derrickman

Mud Tester

Floorman

Crane -optr

Roustabout

W-houseman Welder

Driver

Camp Boss

Painter

Carpenter

Catering crew

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CD on Rig Types