SPE 89632 Further advances

in coiled tubing floater operations Alastair Buchanan

Schlumberger Well Services North Sea Coiled Tubing Services Geomarket Engineer

2 28.09.16

n  Norwegian Continental Shelf Activity n  Conventional Approach n  Issues and Strategies n  Equipment Developments

–  Advanced Tension Frame (ATF) –  Riser Slip Joint

n  Impact n  Conclusions

Agenda

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Norwegian Continental Shelf Subsea Activity n  420 active wells n  Increasing 10% p.a. n  60% Statoil production n  Severe weather and

sea conditions n  Demand for

intervention with CT increasing

n  Available installations semi-sumbersible rigs

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Conventional Scenario n  Injector suspended from

winch n  Multiple degrees of freedom

of movement n  Influenced by heave, pitch,

roll and reel tension

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Conventional Scenario n  Injector suspended from

winch n  Multiple degrees of freedom

of movement n  Influenced by heave, pitch,

roll and reel tension n  Tension frame coupled to

riser n  Multiple transfers between

motion frame of reference

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Conventional Scenario n  Injector suspended from

winch n  Multiple degrees of freedom

of movement n  Influenced by heave, pitch,

roll and reel tension n  Tension frame coupled to

riser n  Multiple transfers between

motion frame of reference

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Issues and Strategies

EFFICIENCY

SAFETY

RELIABILITY

ACTIVITY

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Advanced Tension Frame n  Injector head is constrained at

all times – motion is controlled

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Slip joint n  Influence of heave isolated

below rig floor

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Slip joint

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Impact 1 – Safety and Efficiency

Conven - ATF Conv . +slip - joint

ATF + slip - joint

Transfer 2 crew up Install BOP + BHA 1 Install injector Transfer 2 crew down Transfer 2 crew up Change to BHA 2 Transfer 2 crew down Transfer 2 crew up Remove injector head Remove BOP Transfer 2 crew down Total HEL count

Operation stage Scenario

Conventional ATF Conventional +slip-joint

ATF + slip - joint

Transfer 2 crew up Install BOP + BHA 1 Install injector Transfer 2 crew down Transfer 2 crew up Change to BHA 2 Transfer 2 crew down Transfer 2 crew up Remove injector head Remove BOP Transfer 2 crew down Total hazard level

2 0 0 2 2 0 2 2 0 0 2

12

2 0 0 2 2 0 2 2 0 0 2

12

Operation stage Scenario

2 12 12

2 2

12 2 2

12 12

2

2 12 12

2 2

12 2 2

12 12

2 72 186 186

6 30 30

6 6

30 6 6

30 30

6

6 30 30

6 6

30 6 6

30 30

6

6

2 6 6 2 6 6 2

30 6

102

6

2 6 6 2 6 6 2

6

30

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Impact 2 – Reliability vs Weather

0 10 20 30 40 50 60 70 80 90

100

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Available days

% of total

Conventional Slip-joint

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Conclusions

n  Field tested technology is available which is demonstrated to improve reliability and safety

RELIABILITY

SAFETY

EFFICIENCY RELIABILITY EFFICIENCY

SAFETY

ACTIVITY ACTIVITY