CONCEPTUAL DESIGN OF A FLOATING DRILLING UNIT FOR OIL AND GAS EXPLORATION IN GREATER WATERDEPTH
A group of German industrial firms has examined the feasibility of exploration drilling and production of hydrocarbons from waterdepths up to 2000 m. Starting from the requirements a floating drilling unit for these waterdepths would have to meet, technical solutions for the systems and its components have been developed in a one year's conceptual study. Three basic types of floating platforms were developed: semisubmersible, drill ship, and the newly developed concept of a disconnectable riser carrier. The semisubmersible has a dynamic positioning system. Special emphasis in its design was put on a simple manufacturing process. The dynamically positioned drill ship has been designed in two versions which differ with respect to the propulsion system. The extraordinary high cost of uncoupling and pulling (and subsequently setting) a 2000 m riser with buoyancy material in heavy weather have led to the concept of a disconnectable riser carrier. This is a floating, dynamically positioned unit equipped with riser tensioners, winches, and mud circulating system. During normal drilling operations the riser carrier is part of its mother unit. When sufficiently exact positioning of the mother unit is no longer possible the riser carrier will be disconnected and coupled to the mother unit again when weather conditions permit to resume drilling operations.
- U.S. Sales Only.
Preussag AG Erdoel und ErdgasHanover, Germany
- Meyer-Detring, D
- Publication Date: 1977-1
- Pagination: 34 p.
- TRT Terms: Costs; Deposits (Geology); Design; Drilling fluids; Drilling machines; Drilling ships; Dynamic positioning; Economic analysis; Exploration; Feasibility analysis; Natural gas; Offshore drilling platforms; Offshore platforms; Offshore structures; Oil exploration; Performance; Petroleum; Positioning; Risers (Geology); Semisubmersibles; Ships; Structural design; Weather
- Old TRIS Terms: Drilling ship performance; Floating platforms; Marine risers; Natural gas deposits; Offshore operations; Offshore platform design; Petroleum deposits
- Subject Areas: Bridges and other structures; Design; Economics; Finance; Geotechnology; Marine Transportation; Terminals and Facilities; Vehicles and Equipment;
- Accession Number: 00197855
- Record Type: Publication
- Source Agency: National Technical Information Service
- Files: TRIS
- Created Date: Sep 15 1979 12:00AM