drilling rigs slides

7/28/2019 Drilling Rigs Slides

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Drilling Rig Types

COMPLI ANT


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Jackknife

Most commonly used onshore rig. Rests on the stand & breaks apartinto 4 to 6 pieces & each part carried on a truck


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Jacking up

Also an onshore rig, is a jacknife


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Portable mast

Much smaller than jacknife, for20 m or less drilling with about10m pipe

It is retractable, so can bemoved on a truck

Usually used for completion,shallow holes


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Barge rig

Barge is brought to the position, sunk by filling ballasting components. Mastraised & drilling starts. Once finished, mast is put down, empty water &

move barge. Used for very shallow/flat water (less than 3m) like river orlakes. Contains all equip. from land rig


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Self-contained platformA big platform &expensive contains allrequired stuff

Limited to mediumdeep water (up to 400m), as if deeper,structure becomescomplicated, i.e. more

expensive & notusable for ROV(remote operativevehicle)

Used to support allloads (wave, wind, )

Conventional mast isused as it stays for along term. Up to about

30 holes drilled fromthe mast


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Tender platform

A very small platform, so due to not enough room, one or even twobarges or ships may towed to locate equipments such as separationsys., pumps or restaurant & etc.


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Submersible

A fixed bottom supportedbig platform constructedfrom concrete or steel. Itfloats & moved to position.

Then compartments are ballasted by water. Conventional mast is used & stay fora long period. Mast can move to drill different wells. Limited to 100 m water depth


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Jack-up

A bottom supported platformwith high mobility. Legs (3-4)work (in/)dependently. Limitedto max 100 m water depth

cantilever: one kind of jack-up platform, in which the mast can move to drill ontop of the platform


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pontoons

Semi-submersible

Can drill resting on bottom (platformfloats to position & ballasted tolower) or in a floating position(pontoons float & anchored in place)

Preferred to be used for production well. Works in very deep water (3000 m)Tends to dampen the wave motion


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DrillshipShip floats to position &drilling starts! Not ballasted

Ship is free to move at 6degree of freedom. Soalways facing incomingwaves to dampen wavemotion

Very fast to move, lessstable & everything locatesabove water level

Used preferably inexploratory wells. Can drill

deep waterAnchor or dynamicpositioning system can beemployed (in latter case, it ismore costly thansemisubmersible rigs)


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Spar-buoy (caisson)

Huge hollow steelcylinder shape (40m diameter, 400 m

height!)floats horizontally& brought intoposition. Then

placed vertically &anchored in place.Rig assembled ontop

Very stable butexpensive &difficult to move it.Limited to 1000 mwater depth. Few of them in use


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Compliant platforms

Bottom supportedplatform, where itsstructure looks linearly.Used in up to 1000 m waterdepth. P latform complieswith wave motion

It is the newest generationof offshore platforms

Tension legs & spar-buoyplatforms are also the newgenerations of offshore

platforms


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Common type rigs used

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