INTRODUCTION TO DEEPWATER DRILLING TECHNOLOGY (NEXT NETWORK OF EXCELLENCE IN TRAINING)

Topics to be covered

• What is deepwater drilling? 
• Deepwater provinces - regional differences 
• Deepwater riser 
• Deepwater rigs and operations 
• High deepwater drilling costs and deepwater alternatives slim hole, dual mud gradient systems 
• Evolving deepwater drilling technology  – Deepwater field development concepts deep draft caisson vessel (DDCV-SPAR) vs. TLP (tension leg platforms) 
• Challenges of deepwater technology 
• Conclusions

Introduction

•What is “Deepwater?”
–This is an evolving notion

–Presently considered to be water depth deeper than 1500 ft, ultra-deepwater meaning > 5000 ft of water

•Where is deepwater drilling taking place?
–Present water depth drilling record: 9111 ft (Brazil 2000); 6592 ft 1998; 5700 1982)

–World water depth record for a producing well: 6080 ft (Roncador field, Brazil, 1999)

Unconsolidated Shallow Sediments

• 30” pipe is jetted in (with drill-ahead tool) 
• 30” pipe is structural, not conductor. Usually 80 to 100 m long 
• 20” pipe is conductor, not surface casing. It is run in open water (26” hole drilled riserless). 
• On mobile offshore drilling units (MODU), BOPs and marine risers are run on top, but no use of BOPs in 17-1/2” hole (No shut-in). 
• 13-3/8” casing acting as surface casing 
• Very low fracture gradients

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