02 Vetco - Marine Raiser Systems

Marine Riser Systems

ChevronTexaco ChevronTexaco –– BP BP Training Training Alliance Alliance Floating Floating Drilling Drilling

Integrating … Wellhead, BOP and Riser Design

Vetco Gray - 2 CT-DTC-Floating-CDE.ppt 1 Feb 2004

The design of casing and wellhead systems should be performed with the complete wellhead system – including the riser.


Guideline Type Drilling System

Guidelineless Drilling Systems Connector to Housing Interface

Guidebase/GRA Interface

Housing Interface


Mudmat Interface


MS-700 Family of Wellhead Systems


H-4 Family of Wellhead Connectors


BOP and Lower Marine Package

Courtesy of Hydril Company


Lower BOP w/ Frame


Lower BOP

LMRP Mandrel

w/o Frame

Annular

Choke Line

Blind -Shear Rams Kill Line

Super Shear Rams

Upper Pipe Rams Accumulators (x4) Middle Pipe Rams (Varible) Lower Pipe Rams


(Varible Bore)

Wellhead Connector Courtesy of Hydril Company


Lower Marine Riser Package (LMRP)


Lower Marine Riser Package (LMRP) Riser Adapter

Mud Boost Line Control Pod (1 of 2) Single Flexjoint

Annular


Choke Line Stab

LMRP Connector (H4) Courtesy of Hydril Company


Funnel Down (Optional)

Hydrate Protection Hydrates must be prevented from entering the bottom of the connector. Ice formed from hydrates will prevent the connector from releasing

Fiber Reinforcement PN H12025-2 (16-3/4" Wellhead) PN H12025-3 (Super Wellhead) Rubber

Groove


Groove


Hydrate Protection (Methane Gas)

Hydrate Protection Plum H4 To Inject Freezing Inhibitor

Glycol Inhibitor

Outlet Thru Wash Ports ROV Hot Stab Inlet Thru Wash Ports

SHD H-4 Wellhead Connector


Cavity Capacity 32 Gallon

Type of Well


Exploratory Wells

Disposal

Non-Disposal

Developmental


Wellhead Re–Entry Systems

DP

Moored


Subsea Wellhead Angle

Riser Deployment and Retrieval

Environmental conditions Location Season Vessel

Deployment / Retrieval Riser fatigue life


Currents


Riser Handling and Lifting Gear Capacity

Substructure

Derrick

Drawworks

Hook block

Handling gear

Riser Running Tool

Riser Gimble Shock Absorber

API Riser Coupling Class


API RP 2R establishes riser coupling classes based on the tensile capacity of the coupling. These are; API Riser Coupling Class

Tensile Capacity in millions of pounds

A

.5

B

1.0

C

1.25

D

1.5

E

2.0

F

2.5

G

3.0

H

3.5

J (Proposed)

4.0


MR-6E Riser Coupling

Easy stabbing, fast makeup, and positive alignment

Suitable for operating in water depths up to 7,500 ft depending on environmental and well control conditions; MR-10 designs can operate in depths to 10,000 ft.

Preloaded connection significantly reduces the range of alternating stresses induced by cyclic loading to improve fatigue life

Primary load path for tensile and bending loads through the dogs and into the body, does not impact actuating screws

MR Riser Running Tool 4-1/2” IF API Connection

18o Tapered Drill pipe Connection

Lift / Handling Eye


Choke, Kill & Auxillary Test Caps

MR Box Connection Profile


HMF Riser Coupling

Ideal for deep water applications where high load operating conditions exist

Stepped diameter design of pin and box simplifies engagement, even with severe vessel movement

No loose parts preventing bolt loss and potential thread damage

Field removable and replaceable nose piece

Locking bolts preloaded in excess of rated coupling loads to extend fatigue load of riser system

HMF Riser Running Tools

Casing Elevator Lift Shoulder

Handling Lift Eye


HMF Male Connection Profile

Mechanical Running Tool

Hydraulic Running Tool


Riser Handling Tool

Spider


MR-style riser handling spider supports the riser string on manual or hydraulically operated sliding dogs.

Hydraulic-gate riser spider is used when running or retrieving HMF riser joints through the rotary table.

Gimbal


Gimbal shock absorber supports up to 2,000,000 lb and gimbals when the riser is positioned in the spider.

Reduces impact loads when running and landing marine riser joints.


Single Flex Joint with Mud Boost Line

Flex Joints


Single Flex Joint & Intermediate Flex Joint


Riser Extension

Key Riser Components and Inspection

Drilling Riser


Prepped for Buoyancy


Installation of Syntactic Foam Buoyancy Modules on a Riser Joint


90’ (27.4m) Riser Joint (w/ Spreader Bar)


Telescopic Joint

Telescopic Joint

Available for both multiple riser systems Compensates for heave and offset of the vessel Maximum rated riser tensile load capacity in

locked position Hydraulic latch release for inner and outer barrels

available Vetco Gray - 36 CT-DTC-Floating-CDE.ppt 1 Feb 2004

Dual split/solid packer elements Fixed or rotating integral/non-integral tensioner

rings SDL, SLS, KT and SDC tensioning rings

Primary Components of Telescopic Joint The outer barrel sub assembly has several functions:

Providing a means to apply tension to the Marine Riser / BOP

Fluid assist bearing to allow rig rotation

Tension ring to eliminate the tensioner wire removal

Dual packer assembly

Kill, choke and Auxiliary line supply assembly

The inner barrel sub assembly functions:

Providing communication between the vessel and the BOP during drilling

Contains an Auto latch system to lock inner/outer


barrel

Split lock nut for easy servicing

Cross-over flange to riser connection and diverter

Fully extended can support 1.5m lbs

Crossover to Riser Connector

Split Lock Nut

Hydraulic Latch

Dual Packer Inner Barrel Latch


Inner Barrel

Slipjoint / Telescopic Joint

Slipjoint / Telescopic Joint

Options Options

SDL Tension Ring

Fluid Assist Bearing

Kill & Choke & Hydraulic Supply Terminations

SLS Tension Ring

Options


KT Tension Ring


Type SDL Riser Support Ring

Saves rig time by eliminating tensioner wire removal

Stored below diverter and allows the rest of the riser to be pulled through

Contains two sets of hydraulic dogs One to latch to diverter for storage The other to latch to outer barrel while drilling

Diverter System

In Floater Operations


The primary function of a diverter is to divert shallow gas through overboard piping before the installation of the BOP stack. This vents the well and protects the formation before it is capable of handling closed-in pressure from the installed BOP. After the BOP is installed it is used to vent gas in the riser, above the BOP.

There are two primary models of Vetco Gray diverters used on floaters: KFDS – using an expandable rubber packer KFDS- CSO – using a collapsible rubber element

There is one primary model of diverter used on Jack-ups and Platform rigs : KFDJ – using an expandable rubber packer

Diverters are available in 39-1/2”, 49-1/2” and 60” nominal sizes

Pressure ratings range from 500 to 1000 psi

Hang-off capacities range 500 kips – 2000 kips

KFDS Diverter System

Pressure Rating (Wellbore): 500 PSI

Diverter Operating Pressure:

Rotary Table

Control Lines/Block

Normal 750 psi ( 52 bar) Maximum 1500 psi (103 bar)

Insert Packer

Diverter Assembly

DiverterLocking Dogs

Diverter Housing Flowline

Flowline Seals (x2)


Flex Joint

Crossover to Riser Connector

KFDS Diverter System

Pressure Rating (Well bore): 500 PSI

Diverter Operating Pressure: Normal 750 psi ( 52 bar)

Control Lines/Block

Maximum 1500 psi (103 bar)

Insert Packer

Diverter Assembly DiverterLocking Dogs

Diverter Housing

Flowline Seals (x2)


Flowline

Diverter Assembly Packer Element

CSO Diverter Divert Line Flow Line


Diverter Flex Joint

C

B D

Current induced loads can cause the Riser to bind as it is run through the Rotary Table and Diverter Housing.

A D

DIVERTER HOUSING REGION

W.L.

D

A

D

CURRENTS


A STRUCTURE/RISER CONTACT B

BINDING CONTACT, RESULTING IN RISER DAMAGE AND FOAM MODULE DAMAGE.

C MAKE-UP DIFFICULTIES DUE TO ANGLE. D RISER OVERSTRESS.

Lifting Equipment Rig lifting equipment must be able to deploy the Riser with the LMRP/BOP Package without exceeding design capacity.

WAVE HEAVE W.L.

HOOK LOAD INDICATOR

RATED LIFTING GEAR CAPACITY

DYNAMIC LOAD ON LIFTING GEAR

HOOK LOAD NET WEIGHT OF RISER ON LIFTING GEAR


TIME

AMPLIFIED RISER RESPONSE

MUDLINE

Storm Hang-off of Riser HARD HANGOFF, RISER HEAVES WITH VESSEL

SOFT HANGOFF, RISER HEAVE IS MINIMIZED BY TENSIONER STROKE

Stay attached during storm conditions

Disconnect the riser and pull out of the hole

Hang-off – Hard or Soft


W.L.

LMRP

Riser Fatigue Considerations

Wave Loads Environmental Conditions Riser Pipe

Current-induced Vortices


⇒ Steady ⇒ Current ⇒ ⇒

VIV Excitation Due to Currents Vortex shedding due to steady current acting on a pipe results in pipe dynamic motions and fatigue.

Drift-Off/Drive-Off D E G R A D IN G S T A T U S G REE N

P REP FO R E DS

E D S T IM E ( A P P R O X . 60 SEC ON D S)

YE LL O W A LE RT

R E D ALER T

D IS C O N N E C T C I R C L E

V ESSEL O FFSE T FR OM W ELL C EN TE R

G R E E N - N O R M A L O P E R A T IO N S Y ELL O W A LER T - P RE PA RE FO R E DS R E D A L E R T - E D S IN IT IA T E D


D IS C O N N E C T C IR C L E - E D S C O M P L E T E D , R IS E R D IS C O N N E C T E D

• Disconnect Speed • Control System

• Riser Tension Recoil • Control of Disconnect

Limits for Connected Riser Operations

VESSEL MOTIONS ANGLE

WAVE ACTION

CURRENTS


ANGLE

MUDLINE

W.L.

C

A

VESSEL OFFSET ANGLE

W.L.

B

POSSIBLE WEAKPOINTS C ANGLE D

E


MUDLINE F

Riser, Wellhead and Conductor Strength

A

TENSIONERS/TELESCOPIC JOINT

B

RISER

C

FLEX JOINT

D

LMRP/BOP

E

WELLHEAD & CONNECTORS

F

CONDUCTOR PIPE

To prevent failure of Riser/Well System Components, Emergency Disconnect must be completed before vessel offset causes the Riser/Well System to exceed allowable limits.

θ

System Considerations F

System Objective Provide a system level solution for drilling in ultra deepwater drilling:

BOP Flange Wellhead Connector

~6.6 MM ft-lbs

~7 MM ft-lbs

~7.7 MM ft-lbs ~8.4 MM ft-lbs

15,000 psi to 20,000 psi rated pressure


Wellhead System Conductor/ Casing Connectors

BOP Flange Wellhead Connector Subsea Wellhead System Conductor Sizing (Analysis) Conductor/Casing Connectors

~14 MM ft-lbs (40' Below Mudline)

7,000,000 ft.-lbs. Bending @ 15,000 psi

MUST MAINTAIN CLEARANCE IN TELESCOPIC JOINT

Riser Recoil Response

NO SLACK IN WIRE ROPES

W.L.

LMRP LMRP MUST MAINTAIN CLEARANCE ABOVE BOP STACK

BOP


LMRP

BOP MUDLINE

After riser disconnect, the LMRP must be lifted to prevent contact with the BOP stack during vessel down heave.

Riser Burst Pressure

Minimal pressure device

Contingency plan for bubble in riser

W.L.

MUD PRESSURE


SEAWATER PRESSURE BOP MUDLINE


Gas in Riser vs Choke/Kill Line

Riser Collapse/Riser Fill-Up Valve Placement

W.L.

During an emergency disconnect, external pressure from seawater can collapse the Riser if the mud column drops too fast.

EMPTY RISER

LMRP


MUD RELEASE FROM RISER SEAWATER PRESSURE BOP MUDLINE

Torque Loads due to Heading Change


As vessel heading is changed, excessive torque can be applied to the connected drilling riser.

Wellhead with a rigid lockdown mechanism to enhance fatigue life.

Control Panel Release Piston Indicator Power Piston Indicator


Latch to 36”

Riser Monitoring Systems and Inspection Methods Daily: Mud weight Environmental conditions change Riser tension and rig location


Long Term: Corrosion Cracks Wear and Damage Choke and Kill lines


Benefits from Composites

General Increased fatigue life Elimination of corrosion problems

Composite Choke and Kill Lines Provides a 60% weight savings over equivalent steel lines Can save about 25-30% of the total riser string weight, thus extending an existing rig’s drilling depth accordingly

Composite Drilling Riser System Provides a 65% weight savings over steel riser systems Can increase the drilling depth of an existing rig or platform Significantly reduces the variable deck weight

Composite Production Riser Provides a 60-80% weight savings over equivalent steel risers Can eliminate the need for tensioners on TLPs and SPARs Can increase the number of wells for a given vessel smaller space requirements less deck weight Can increase the water depth for a given production system.

VGI Composite Products

X X


X

Choke & Kill Lines Drilling Risers Production Risers

Harnessing incredibly strong carbon fiber and durable epoxy matrix to produce light-weight oilfield products

Composite products are providing solutions to today’s challenges

Composites enable use of existing rig fleets and production platform designs to go deeper -safer and less expensively.

5,000’ Rig Upgrade to 10,000’

Baseline 5,000’ Water Depth Capable Rig X All Steel Riser System (C&K, booster, hydraulic) X Nominal 2,000 Kip Tension with 15 ppg Mud X 46” Diameter Buoyancy X Deck Weight of 2.3 M lbs X Day Rate of $30k

Steel System

Composite System


10,000’ Composite Riser Upgrade X System Deck Weight X 5,000’ of Steel Riser Body X 10,000’ of ALL Aux. Lines X Added 3,000’ of Buoyancy X Total

$8.4 Million Savings

3.55 M lbs $2.0 M $11.7 M $1.5 M $15.2 M

OR

10,000’ Steel Riser Upgrade X System Deck Weight X 5,000’ of Full Riser X 7,200’ of 56” Buoyancy X Total

5.8 M lbs $5.3 M $6.1 M $11.4 M

+

Savings in Upgrades on Rig X 12 Months of Docked (50%) X 60” Rotary Table Upgrade X Rig Buoyancy Upgrade ($2.36/lb) X Total

$5.5 M $1.5 M $5.2 M $12.2 M

02 Vetco - Marine Raiser Systems

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