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