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Jackup Strategy Richard Roper

Sr. Director – Capital Projects

April 11, 2012

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0

20

40

60

80

100

120

Jackup Orders

Indep. Leg JU Mat JU

Jackup Strategy

Build Boom Early 80’s

Followed by Recession

Next Build Boom

Financial Crisis

Continuation of Build Cycle

Source: ODS-Petrodata

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Jackup Strategy

• New construction

– Design for maximum prospectivity

• Measured by North Sea “area of operability”

– With step changes

• Environmental resistance

– Operating area in North Sea

» By-products

• Deepwater West Africa

• Hurricane survivability

• Drilling capacities

• Handling

• Ergonomics

– At maximum value for money to clients / R.O.I. to Ensco

• Deliver much more capacity than similarly priced equipment

• Compete head-to-head w/ much more expensive equipment

– While retaining competitive edges long-term

• Cantilever patent

• Exclusive new design

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ENSCO 120 Series Jackups

Main Dimension

Length 246 ft

Breadth 250 ft

Depth 31 ft

Leg Spacing 156 ft trans. X 150 ft long.

Legs 3 x 540 ft

Chord Spacing 45 ft

Cantilever Envelope Max 80 x 32 ft

Capabilities

Variable Deck Loading 14,300 kips

Liquid Mud 7500 bbls

Derrick 2.5 mil pound

Mooring 4 x 45mt

Helideck (CAP 437) 12.8 mt

Accommodation 150 person

* Operable in Danish, Dutch and UK sectors (Norway excluded)

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North Sea Areas of Operability by Design N

. S

ea

A

rea

s o

f O

pera

bili

ty (

km

^2)

200000

250000

300000

350000

400000

450000

500000

Hard Soil

Soft Soil

Ultra Harsh Harsh Environment Non-Harsh

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Expanded North Sea Operability

ENSCO 120 Series North Sea Operability Map

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Hurricane Survivability – Assessment Results

0 50 100 150 200 250 300

E75

E105

E120

60

78

91

88

112

138

15

50

300

GOM Hurricane Survivability - "High" Fixity Case

Return Period of Survivability(yrs)

Wind Speed (knts)

Hmax (ft)

Circa. 2000

Design B

Circa. 2000

Design A

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Step Change Improvements

vs. Current Fleet

Major Items

• Hoisting = 2.5M# (1st) vs. 1.5M# on most rigs (2M# on ENSCO 109)

• Derrick = quad vs. triple racking capacity: 10,000’ 6-5/8”, 25,000’ 5-7/8”, 12 stands – 9-1/2” DCs, 7000’ 13-3/8” casing or 10,500’ 9-5/8” casing or 13,000’ 7” casing

• Drill floor = double offset (7.5’ aft & 2’ trans.) vs. conventional on center

• Drill floor redundancy = elev. cabin & 2x ST160’s w/ PRS-6i

• BOP/ tree handling – dual BOP / tree carts, utility bridge crane, fork lift BOP bridge crane.

• Cantilever (Ensco IP @ 80’ reach, 17’ transverse, >2.4M# ) (patents filed)

• Knuckle boom crane + catwalk machine vs. conventional V-door ops.

• Elevating pinions = 54 vs. 36 (1000k normal/ 1300k preload)

• 7500 bbls liquid mud vs. 5000 bbls

• POB = 150 vs. typical 120

• Davit-launched rescue boat

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E120 - Step Change in Cantilever Load

Cantilever load chart with Ensco IP

Cantilever load chart without Ensco IP

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Wider/Deeper Drilling Capabilities

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ENSCO 120 fly-around

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ENSCO 120 Stand Building Animation

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ENSCO 120 Tripping In Animation

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North Sea Areas of Operability by Design N

. S

ea

A

rea

of O

pera

bili

ty (

km

^2)

200000

250000

300000

350000

400000

450000

500000

Hard Soil

Soft Soil

Ultra Harsh Harsh Environment Non-Harsh

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Ultra-Harsh Environment Jackup Design

ENSCO 130 Series

Main Dimension

Length 266 ft

Breadth 308 ft

Leg Spacing 185 ft trans. x 160 ft

long

Depth 37 ft

Leg length 3 x 600 ft

Chord spacing 54 ft

Cantilever Envelope Max 90 x 40 ft

Capabilities

Harsh Environment Water Depth 430’

Mild Environment Water Depth 560’

Variable Deck Loading 14,300 kips

Liquid Mud 7500 bbls

Derrick 2.5 mil pound

Mooring 4 x 45mt

Helideck (CAP 437) 12.8 mt

Accommodation 150 single man cabins

* Operable in Danish, Dutch and UK sectors (Norway excluded)

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ENSCO 130 Particulars

Major Items

• Hoisting = 2.5M#

• Derrick = quad racking

• Drill floor = double offset (7.5’ aft & 2’ trans.)

• Drill floor redundancy = elev. cabin & 2x ST160’s w/ PRS-6i (or 2x)

• BOP/ tree handling – dual BOP / tree carts, utility bridge crane, fork lift BOP bridge crane.

• Cantilever (Ensco IP @ 90’ reach, 22’ trans., >500k. ) (patents filed)

• Knuckle boom crane + catwalk machine

• Elevating pinions = 72

• 7500 bbls liquid mud vs. 5000 bbls

• POB = 150 single man cabins/ semi-private T&S

• Davit-launched rescue boat

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ENSCO 130 Series – North Sea

• ENSCO 130 Series

– Capable of working to 60 deg. N

– Block 9

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• Rig : E130 Series

• Criteria : SNAME

• Hard soil : 131 m - approximate area with water depth < 131m : 438 540 km²

• Soft soil : 120 m - approximate area with water depth < 120m : 415 160 km²

ENSCO 130 Series

North Sea Operability

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Summary

• All objectives of JU strategy have been / are being achieved

– Max. prospectivity

– With technical step changes

– At max. value for money/ROI

– While retaining competitive edges long-term

• ENSCO 120 Series represents a step-change in:

– Harsh environment area of operability

– Hurricane survivability

– All drilling capacities

– Handling

– Ergonomics

• ENSCO 130 is a potentially strategic leverage of the successful JU

strategy resulting in E120 Series.

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