| Abstract |
During the past decades, the oil and gas industry has proceeded to utilize offshore fields in ultra-deep water depths, and the geothermal exploration is going to deeper reservoirs in harder rock. Thus, application of existing technologies such as steel based drill and production pipes in those environments impose technical and economic challenges indicating the need for alternative, innovative products and solution to harness deep geothermal energy. In order to overcome some technical challenges during ultra-deep water and deep geothermal drilling applications, new materials by means of coiled tubing, self-supporting composite riser (Sscr) And production systems are introduced in this paper as one innovative technical and economic option. The sscr is designed to support its own weight during installation, production and intervention applications specifically carried out during coiled tubing operations. At the international geothermal centre (Gzb) In bochum, many innovative methods have been explored to find an economic and technical feasible ultra-deep geothermal drilling solution. Amongst them, composite coiled tubing drilling technology has shown promising advantages in efficiency with continuous and excellent horizontal drilling capabilities, fast trip times, small footprint and logistics, easy usage in stable, hard rock environments, micro hole drilling capabilities, etc. In order to further push and develop this coiled tubing drilling technology for deep drilling exploration and production application, full scale composite coiled tubing testing platform and demonstrator drill rig has been designed and built. Advanced composite materials may currently be the best option for offshore riser systems and coiled tubing applications as it has a greatly improved fatigue life and a significant reduction in total weight, which translates into lower required top tension and consequently lessens mooring tension and platform size. Composite materials in general are defined as any material which is fabricated from two or more distinct materials with enhanced properties. Advanced composite materials offer the potential to overcome the limitation of isotropic metals by increasing the service life of the tubular and extending the operational parameters (Barbero e. , 2012). This paper presents the theoretical design and analysis of advanced composite material design for a self-supporting composite riser and deep drilling coiled tubing demonstrator. The design and environmental groundwork is based on advanced composite material theories (Barbero e. J., 2012) (Daniel, 2010) And standard ultra-deep water requirements (ApI, 1988) (Dnv, 2001). |