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OPERATION WITH JACK-UP

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Source: DRIL-QUIP

OPERATION WITH JACK-UP

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Independent Leg JU Mat Supported JU

Jack-Up ….

Mat Supported (MS) type,

Independent Leg type

(and also

Cantilever type

Slotted type)

OPERATION WITH JACK-UP

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JACK-UP RIG:

Punch-through

It is very important to establish the sea bed characteristic at the proposed

drilling location. The survey should give the sea floor penetration to be

expected at that location for this geology. The softness of the sea floor will

cause more or less penetration into the sea floor, such as soft clay.

The preload compact the sea floor but after some time, the vibration of the

drilling activity makes this compacted formation collapse into a cavity, causing

a punch-through. Punch- through can be devastating and even lead to the

total loss of the jack up.

The derrick, or mast, on a jack-up may be located over a drilling slot indented

in one side of the structure, or the drill floor may be cantilevered over the side

of the deck, allowing the rig to drill wells on stationary wellhead platforms.

OPERATION WITH JACK-UP

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Punch-through = immediate consequences ….

Legs and jack house seriously damaged

More than 8 months to recover the situation !

Jack up out of order to continue delineation programme.

Lessons learnt

Sea bed surveys are compulsory,

Procedures for pre-loading or jack down must be carefully reviewed,

Punch through JU « Rowan Anchorage «

June 1973 - Indonesia

OPERATION WITH JACK-UP

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JACK-UP RIG:

Other operational problem: JU rig re-entry into previous foot prints.

This problem can be minimized:

-- by increasing bending stiffness, between legs and hull (refer to JU design),

-- by using a rig with an identical spud-can arrangement and by ensuring that

the spud-cans re-occupy the same holes.

-- by undertaking preloading slowly with the hull in the water or as close as

possible to the water,

-- by jetting the legs in case any hang-up occurs within the old holes.

-- by making sure that the rig mooring equipment is adequate.

OPERATION WITH JACK-UP

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Jack-UP

mat supported type

For very soft seabed formations where high

leg penetration is anticipated (and non-acceptable),

a mat-supported JU can be mobilised.

This mat transfers the weight of the jack up through

the large surface of the mat. It is possible

to bring the jack up very close to the production

platform without undermining the platform.

Nowadays, only a few mat-supported JU are available.

Jack-UP -- mat supported type

Slotted type

OPERATION WITH JACK-UP

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Heavy Jack-Up

Mid-2009, 17 JU were designed to drill in 400 ft WD (and 2 * in 490 ft WD)

Main specs of those 400ft JU ….

WD operating 400 ft

Overall leg length 517 to 548 ft

Spud can dia. 46 to 59 ft

drilling pattern (60 x 30)ft or (75 x 30)ft

CP tensioning cap. 250 to 400 st

Maxi variable loads 3800 to 5000 st

BOP 10 to 15 kpsi

Main type / design: KFELS mod V “B” class, MLT 116CE, F&G JU- 2000E

( * Rig names: Maersk Innovator & Maersk Inspiror )

“Maersk Innovator”

OPERATION WITH JACK-UP

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Source/photos: Internet OILPRO - Stephen Peterson

After delivery from the yard, Maersk Intrepid will mobilize to the North Sea and begin a four-year firm contract with Total E&P Norge for drilling the demanding and complex wells on the Martin Linge field development in the Norwegian

North Sea With a leg length of 678 feet, the rigs are the world's largest jack-up rigs and are designed for year-round operation in

the North Sea, in water depths of up to 492 feet.

OPERATION WITH JACK-UP

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JU Drilling unit

Cantilever type

View of the legs going through

the hull

OPERATION WITH JACK-UP

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Jack-Up -- implementation

OPERATION WITH JACK-UP

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Leg length calculation

MSL = Main Sea Level = average level of tides

CD = Chart Datum (+/- LAT (Lowest Astronomic Tide)

hull

Jack house

leg

Spud can

OPERATION WITH JACK-UP

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Leg length installed (typically / approx.)

for a 250* ft JU 315’ < leg length installed < 350’

for a 300* ft JU 410’ < leg length installed < 430’

for a 350* ft JU 450’ < leg length installed < 515’

for a 400* ft JU 500’ < leg length installed < 570’

Names of “JU-families” only approx. leg length installed

OPERATION WITH JACK-UP

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Typical measurements

JU skidding limits:

Long. = 45 ft

Lat. = 12 ft each side

Required on this WHP:

38.5 ft + 2ft uncertainty

7.5 ft + 2 ft uncertainty

Wellbay on WHP

Jack -UP

OPERATION WITH JACK-UP

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Jack-Up and “stand alone” operations

OPERATION WITH JACK-UP

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27

Jack-up operations

on location

OPERATION WITH JACK-UP

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Jacking system

OPERATION WITH JACK-UP

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Source / illustrations: IFP Training

Moving on location

Jack-up operations

then,

“stand alone” operation

JACK-UP

Conductor pipe

OPERATION WITH JACK-UP

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JU on stand-alone

operation

OPERATION WITH JACK-UP

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Jack-Up on Wellhead Platforms

OPERATION WITH JACK-UP

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For operations with a Jack-Up ….

Some points to verify,

- spud cans, leg length vs seabed survey

- leg length vs height of wellhead platform

- cantilever extensions vs well bay on wellhead platform

- preloading procedures Ref. to Rig Operating Manuals

OPERATION WITH JACK-UP

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Wellhead platform

Jack-Up (drilling unit)

seabed

OPERATION WITH JACK-UP

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Wellheads and X-mas trees

Wellbay

Notes for the Professor,

-- continue this section with the next slides n° 35 to 47,

Or,

-- refer to chapter “ Wellhead and X-Mas tree “ (specific section

DO 1451).

OPERATION WITH JACK-UP

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Wellhead and X-Mas tree

Operations with JU in “stand alone” mode

(exploration well)

OPERATION WITH JACK-UP

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DIVERTER SYSTEM

Installed on the conductor pipe

during drilling surface hole

whenever shallow gas zones are

anticipated or suspected

OPERATION WITH JACK-UP

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Source / illustrations: IFP Training

JU on stand-alone

operation

Drilling on free standing

conductor / casing pipes

Working

platform

OPERATION WITH JACK-UP

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Typical / Standard BOP stack

installed on wellhead

OPERATION WITH JACK-UP

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Surface wellhead and MLS *

* MLS = Mud Line Suspension

A MLS system will be used:

- On “stand alone” operations

when WD is > 40 m

(approx),

- When pre-drilling operations are

implemented

OPERATION WITH JACK-UP

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Mud Line Suspension system (MLS)

OPERATION WITH JACK-UP

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Typical Surface wellhead system

Unihead system

Different casing are installed

without N/D the BOP for N/U

additional casing spools

Source: FMC

OPERATION WITH JACK-UP

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FMC UNIHEAD SYSTEM

Source: FMC - Unihead System

More and more, Onshore wellheads are derived from Offshore Technologies

OPERATION WITH JACK-UP

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Wellhead and X-Mas tree

Operation with JU over a wellhead platform

(development wells)

OPERATION WITH JACK-UP

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Wellheads on wellbay

and

BOP set up on

a new well

OPERATION WITH JACK-UP

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Wellbay area with X- mas trees

2 free slots

OPERATION WITH JACK-UP

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Using a Jack-Up

For other offshore operations

OPERATION WITH JACK-UP

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Additional offshore operations

which can be performed with a

JU

OPERATION WITH JACK-UP

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Jack-Up -- rig move

OPERATION WITH JACK-UP

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Jack-Up towing in progress

OPERATION WITH JACK-UP

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Dry tow is preferred to move JU

over long distance

OPERATION WITH JACK-UP

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Slides were prepared for presentation and information to Students of Schools and Universities only.

References

Slides presented were prepared with illustrations from the following referenced documents:

- API Standards and Recommended Practices,

- Neal J. Adams, Drilling Engineering , PennWell Books, Tulsa, Oklahoma, 1985,

- (Halliburton) - Petroleum Well Construction – J Willey & Sons

- Miscellaneous books from “Chambre Syndicale de la Recherche et de la Production du Pétrole et du gaz naturel”

- IFP Drilling data handbook

- Miscellaneous documentation from TOTAL Drilling Division

- Halliburton Completion Services

- Miscellaneous books from IFP

- Leading Edge Advantage Ltd (Under Balance Drilling).

- Miscellaneous documentation from web-sites: O&GJ, World Oil, SPE

- Transocean, Saipem, Pride Drilling Contractors

- Baker Hughes, Schlumberger, Weatherford, Wild Well Control Service Companies

- Cameron, Hydril, Companies.