DIRECT ACTING HOISTING SYSTEMHarald Langenes, NFLB 12 juni 2015

• ZPMC• PPL x 9 pakker• SWS x 6 pakker• QWHI• YZJ• Worley Parson• OSX x 2 pakker• DSIC x 4 pakker• Jurong x 2 pakker• Petro Vietnam• Keppel FELS• Lybster

29 Complete Drilling Packages 2007 - 2014

• 37 Drawworks• 37 Top Drives• 70 JiM 10 (Roughnecks)

• 39 Catwalk machines• 23 Smart Rackers (Pipehandling machines)

• 24 Sack Dosing Units• 45 Drilling Control Rooms

Selection of Product Deliveries

Why do we have to do something different?

Hoisting Systems

• Offshore drilling started in the early 60’?

• Each new generation rigs conquered deeper waters

Drilling History

Bluewater 1 – 1962 (www.offshore-mag.com)

• Hoisting Capacity • Increased from below 500 shT to 1250 shT• Next step will be 1500 – 2000 shT

• Drillstring Compensation• Increased from below 500 to 1500 kips• Next step probably 2000 – 2500 kips

Drilling History

• Hoisting System

• Increased from 8 to 16 falls• Added power

• Drillstring Compensation

• Stronger steel structures• Larger cylinders

What has been done to meet the requirement?

• Hoisting System

• Increased friction due to number of sheaves.16 fall system has 15 – 18% loss

• Increased inertia in the system• Increased drill line (2 1/8” ++)• Reduced hoisting speed

• Drillstring Compensation

• Increased weight on Top Mounted Compensator affects the overall VCG

What are the consequences?

• Multiple wires on single layer winch drum

• Wires routed via sheaves in derrick top directly to the Top Drive

Direct Acting Hoisting System

Direct Acting Hoisting System

• Increased safety using multiple wires

• No Cut & Slip

• Reach 20% higher speed in half the time with the same power input

• At low weights, the energy consumption is 60 – 70% of a drawwork system with same capacity

• Drillstring Compensator equipment accessible using rig crane

• Lower VCG

Direct Acting Hoisting System

• Higher level of safety

• Increased operational time

• More efficient

• Increased VDL

The improved efficiency can be used to either increasing the operational speed or reduce the required power input