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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