SPE 89632 Further advances in coiled tubing floater operations

1
SPE 89632Further advances in coiled tubing
floater operations

• Alastair Buchanan
• Schlumberger Well Services North Sea
• Coiled Tubing Services Geomarket Engineer

2
Agenda

• Norwegian Continental Shelf Activity
• Conventional Approach
• Issues and Strategies
• Equipment Developments
• Advanced Tension Frame (ATF)
• Riser Slip Joint
• Impact
• Conclusions

3
Norwegian Continental Shelf Subsea Activity

• 420 active wells
• Increasing 10 p.a.
• 60 Statoil production
• Severe weather and sea conditions
• Demand for intervention with CT increasing
• Available installations semi-sumbersible rigs

4
Conventional Scenario

• Injector suspended from winch
• Multiple degrees of freedom of movement
• Influenced by heave, pitch, roll and reel tension

5
Conventional Scenario

• Injector suspended from winch
• Multiple degrees of freedom of movement
• Influenced by heave, pitch, roll and reel tension

• Tension frame coupled to riser
• Multiple transfers between motion frame of
  reference

6
Conventional Scenario

• Injector suspended from winch
• Multiple degrees of freedom of movement
• Influenced by heave, pitch, roll and reel tension

• Tension frame coupled to riser
• Multiple transfers between motion frame of
  reference

7
Issues and Strategies
ACTIVITY
EFFICIENCY
RELIABILITY
SAFETY
8
Advanced Tension Frame

• Injector head is constrained at all times
  motion is controlled

9
Slip joint

• Influence of heave isolated below rig floor

10
Slip joint
11
Impact 1 Safety and Efficiency
Scenario
Scenario
Operation stage
Operation stage
Conven
-
Conv
.
ATF
Conventional
ATF
Conventional
ATF
ATF
slip
-
joint
slip
-
joint
slip-joint
slip
-
joint
Transfer 2 crew up
Transfer 2 crew up
Install BOP BHA 1
Install BOP BHA 1
Install injector
Install injector
Transfer 2 crew down
Transfer 2 crew down
Transfer 2 crew up
Transfer 2 crew up
Change to BHA 2
Change to BHA 2
Transfer 2 crew down
Transfer 2 crew down
Transfer 2 crew up
Transfer 2 crew up
Remove injector head
Remove injector head
Remove BOP
Remove BOP
Transfer 2 crew down
Transfer 2 crew down
Total HEL count
Total hazard level
12
Impact 2 Reliability vs Weather
100
90
80
70
60
Available days of total
50
40
30
20
10
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Conventional
Slip-joint
13
Conclusions

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

ACTIVITY
ACTIVITY
RELIABILITY
RELIABILITY
EFFICIENCY
EFFICIENCY
SAFETY
SAFETY