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Multipurpose Riserless Drilling Vessel
NORSHORE ATLANTIC an efficient and environmental friendly multi purpose drilling
vessel. The vessel is primarily designed for riserless operation utilizing known and
field proven technology, resulting in significant cost reduction for our clients
Norshore Atlantic
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Norshore Atlantic
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Norshore
• Norwegian based, fully integrated Drilling Contractor Company.
• Purpose built Riserless Drilling Unit, Norshore Atlantic – Built according to the Norwegian Rules and Regulation, Mobil Offshore Unit. (More
strict than MODU).
• Advantages to Operators – Reduced Well Cost
– Increased Rig Utilization of Rig(s) on Contract
– More efficient Field Development
– More efficient Sub Sea field Decommissiong.
– Reduced Logistic
– Early Pilot Hole at Low Cost
• Well Management Services (Optional)
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Multi purpose vessel, focused on drilling
Riserless Drilling
• Drilling with 18 ¾” 10k BOP
• Plug & Abandonment
Well
Intervention
• Light Well Intervention w/SS Lubricator (Wire Line, Tractor Operations)
• Coil Tubing Intervention w/ Stiff Top Compensated Work Over riser.
Other
• Module Installation, SS-crane or “Wet Tow” of Large SS Modules (Templates,
Manifolds, Etc..)
• Dredging, ROV Support – Survey
Significant cost savings by using the right-sized tool
Sub Sea
Construction
• MOBO Installation (SS Pumps w/Caisson)
• Infield treaded flowline.
• Through Tubing Rotary Drilling (TTRD)
Cost reduction
potential; 30-50%
Cost reduction
potential; 30-50%
Additional capabilities
Riserless
Completion • Open Water Completion Running in
combination with LWI.
Cost reduction
potential; 30-45%
Norshore Atlantic - specification
Capacities
Main particulars
• Length overall : 115,40 m
• Breadth molded 28 m
• Depth main deck 9,00 m
• Deadweight approx 6,500 t
• Moon Pool 7,20 x 7,20 m
• Speed (dm-4,5m, open moonpool) 14,0 kts
• 98 Beds
• DNV *1A1 – Ship-shaped Drilling Unit – (Drill(N))-FS –
E0 – DYNPOS AUTRO-DK – Heldk SH-LFL* –
HL(2,8) – COMF-V(3) - Clean design
• Fresh Water 1,000 m3
• Fuel oil 1,400 m3
• Liquid Mud 1,150 m3
• Dry Bulk (Cement/barite) 2 x 76 m3, 2 x 70
• Hydrocarbon Slop tank 85 m3
• Methanol 7 m3
• Work deck 1,200 m2
Equipment
• Main engines : MAK (6pcs) – 14,600 kW
• DP-3, Thrusters : RollsRoyce – 2x3,000kW and 4 x
1,500 kW
• Drilling – Module Handling tower : NOV (500 sT A&P HC)
• Top Drive (Continuos Drilling Torque 55200 ft-lb)
• Drilling Equipment; NOV (including 3x1600 mud pumps)
• Remote Operated Pipe Handling, NOV.
• Mud Mixing Package; NOV
• Offshore Crane : NOV (140t AHC, 2500 m wire)
• 18 ¾" 10 K BOP (4 x Rams, 1 x Annular)
• Mud Recovery System
• 6 x 100 mT Skid Stations
• ROV - 175 HP Work ROV (For rental through
Oceaneering).
• Cement Unit (For rental through Halliburton)
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Norshore Atlantic under construction
21 November 2013 6
21 November 2013 7
Norshore Atlantic under construction
Norshore Atlantic under construction
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North Sea Scenario Norshore Concept
Semi-submersible drills entire well; tophole
drilling, drilling with riser/BOP, well completion.
75 Days 10 + 65 Days
Norshore drill top holes & last part of P & A.
Drilling rig/ship to perform remaining drill work.
An oil company with three drilling rigs can drill ~14 wells in one year
With one Norshore unit and three drilling rigs he can drill ~17 wells in one year
Tophole Drilling - A more efficient way of drilling
Well cost reduction of 5 -15 %.
Annual increased rig utilization of 10 - 20 %
World wide market
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Brazil, Pre-Salt potential savings, Norshore top hole for field development
6 Rigs in operation 6 Rigs + Norshore Atlantic
The traditional method; The improved method;
•16% more wells/year; from 21 to 24
• Savings > USD120 mill/year
• Early production from 3-4 wells/year
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Load Out Plan
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Riserless P & A – Replace Rig
• Replace Rig
• One unit for the entire P&A
activity.
• Full Pressure and Well Fluid
Level Control.
• More efficient solution.
• Lower dayrate
• Toat Well (P&A) Management.
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Riserless
P & A
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Riserless P&A
Tripple Operation
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Riserless P & A - Step 1 (H – XMT)
• Arrive Location
• Run BOP using SS Crane
simultaneously retrieveing XMT
Cap.
• 18 ¾"–10 K BOP Configuration: – H4 Connector
– 3(2) x PR
– 1(2) x BSR
– Annular
– H4 Connector (WH Profile)
• BOP is being run with BOP
Control Umbilicals and K/C
Lines (Redundancy) and WOCS
Umbilical for Control of XMT.
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Riserless P & A - Step 2
• Land and Connect BOP.
Perform Connection test.
• ROV installing WOCS Jumper
Umbilical
• Run 7 ½" Lubricator Section – H4 Connector at bottom section of
Lubricator.
• Land and Connect Lubricator
section on top of BOP (H4
Connector).
• Perform Connection Test.
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Riserless P & A - Step 3
• Run in with Slick Line / Wire
Line and Crown Plug Retrieving
Tool.
• Retrieve Crown Plugs.
• Kill the well – pumping down the
Kill Line ad against Closed
BSR.
• Run WL and install and test
plug below Producion Packer.
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Riserless P & A - Step 4
• Disconnetc Lubricator and pull
out with same.
• Simultaneously install Well Fluid
Pump System (Mud Recovery
System).
• Run in with Tubing Hanger
rerieving toool on DP and pull
out Upper Completion. – Pressure Control while pulling
Tubing Hanger free i.e. Closed bag.
– Flow check i.e. The Well Fluid
System Controls fluid level in Well.
• Install and pressure test shallow
retrieval plug in Production
Casing.
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Riserless P & A - Step 5
• ROV disconnecting MRS Hose
and Control Cable from MRS
Funnel.
• Lift off BOP with SS Crane
• Retrieve XMT from Derrick
• Efficient Dual Operation.
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Riserless P & A - Step 6
• Install BOP again and perform
test against Plug in Prod
Casing.
• Hook up MRS system.
• Retrieve Shallow Plug – Pressure Control i.e. Closed
Annaular while releasing plug.
– Flow Check
• Start P&A with Pressure Control
and acurate Well Fluid Level
Control. – Set Cement Plugs
– Section Milling
– Cutting and Retrieving Casing
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FLOWCHE
CK
FLOWCH
ECK
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0,4
0,6
0,8
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1,2
0
2
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0 2 4 6 8 10
Mu
d c
olu
mn
in W
HIN
(m
)
Me
ter
Cas
ing
pu
lled
Time
Casing
Mud column inWHIM
Refill
INFLU
X
INFLUX
LOSS
LOSS
Riserless Drilling
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• Water Based Mud System
• 30" Conductor
• 20" Surface casing
• 18 ¾" WH
• 18 ¾ BOP
• Mud recovery System
• Standard cgs. prg.
Riserless Drilling
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• Enter most of the Offshore bases
– 7 m draft
• Load up one complete well
• No need for Standby Vessel
• Water Based Mud Sytem
required
Riserless Drilling
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• More efficient operation compared to
Jack Up.
Top hole + main well completion, Step 2.
Top Hole Drilling 12 days (Drill for and run 36” and 20”)
19% of the Well Construction Time
Main Drilling Phase 40 days (Run BOP, drill for and run 13-3/8”, 9-5/8”
and 7” casings. Do initial completion)
65% of the Well Construction time
Main Completion Phase 10 days
16% of the Well Construction Time
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SAVING ON DAY RATE
• 3 mUSD
SAVING ON DAY RATE
• 2,5 mUSD
Cost reduction, increased rig utilization and increased
numbers of wells drilled per year. • Rig Dayrate – 450.000,. USD
• Norshore Atlantic Day Rate – 200.000,- USD
SAVING PER WELL
• Direct day rate savings on drilled well; 20% (5.5 mUSD)
• Rig can be utilized for 22 days on other well; USD10 mill in increased efficiency
Typical average well construction sequence; 52 days drilling and 10 days completion work.
General, Run Upper Completion in Open Water
• Rig install lower completion – 1st barrier
• Rig install 2nd barrier. – Seperate run – barrier assembly. Two internal WL retrievable barriers and one annulus
packer. Verify 2nd barrier by use of Gauges and readback to surface.
• Rig leaves the Location.
• Norshore Atlantic arrives Location (Case: Horizontal Tree).
– Install Horizontal XMT either by SS Crane or from Tower.
– By SS Crane, Install on top of XMT ”Stand Alone” Cutting/Closing Device. (Offline
Activity) • H4 Connector / / 2 x Blind Shear Ram / H4 Connector / Removable Protection - Guiding Funnel
• Alternativ, utilize 18 ¾" BOP.
– Run Upper Completion
– Install SS Lubricator
– Retrieve Internal Plugs, Hold Open Sleeves.
– Install Crown Plug, Tree Cap
– Hand over to Production or Clean Up Well to Norshore Atlantic.
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Optional, Well Intervention Vessel
• Module Installation
• Wireline / Tractor Riserless Well Intervention
with LRP/Lubricator.
Light Well Intervention Intervention with Riser
• Riser Intervention with LRP/EDP - Stiff Top
Compensated Riser.
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LRP/EDP
6 5/8” DP Riser
or Riser ID – 7,25”
Lubric. Valve Sec.
Rotatable Riser
Tension Ring
Subsea Construction Vessel
• Sub Sea Module Installation – 150 mT
compensated Offshore SS Crane.
• ”Wet Tow” – Items moved Offshore,
hanging below the vessel in safe
distance above the Seabed.
• 500 sTon Compensated during
Transit and Installation.
• Large size Sub Sea Equipment
Installation
• Templates / Manifolds / Etc..
• ROV support - survey
Alternative to large Crane Vessels
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