The Cold Box Shuttle - A System for the Recovery of Offshore Gas - Applied to Sweden (1982)

The Cold Box Shuttle - A System for the Recovery of Offshore Gas - Applied to Sweden David Smith; David Smith John Brown Subsea Ltd. Search for other works by this author on: This Site Google Scholar Lennart Eriksson; Lennart Eriksson Swedyards Corp. Search for other works by this author on: This Site Google Scholar Lars-Ove Pehrsson; Lars-Ove Pehrsson AGA AB Industrial Gas Engineering AB Search for other works by this author on: This Site Google Scholar Helge Strom-Olsen Helge Strom-Olsen Kockums AB Search for other works by this author on: This Site Google Scholar Paper presented at the Offshore Technology Conference, Houston, Texas, May 1982. Paper Number: OTC-4401-MS https://doi.org/10.4043/4401-MS Published: May 03 1982 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Smith, David, Eriksson, Lennart, Pehrsson, Lars-Ove, and Helge Strom-Olsen. "The Cold Box Shuttle - A System for the Recovery of Offshore Gas - Applied to Sweden." Paper presented at the Offshore Technology Conference, Houston, Texas, May 1982. doi: https://doi.org/10.4043/4401-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsOffshore Technology ConferenceOTC Offshore Technology Conference Search Advanced Search ABSTRACTThe recovery of offshore gas as LNG, by heat exchange on an LNG carrier with liquid nitrogen, was studied in the context of a North Sea Gas source and a Swedish market. The technical suitability of each component of this Cold-Box Shuttle system was examined in detail .and the capital and operating costs were estimated.It was concluded that the system is technically robust and flexible and that, for the case studied, gas could be landed at a competitive cost.INTRODUCTIONThe Cold-Box Shuttle (CBS) (Ref .l and 2) is the name given to a system for the recovery of gas from offshore fields. It may be applied to either an oil field producing associated gas or to a gas field. The concept which arose during a broad study of the recovery of offshore associated gas, has now been applied to the delivery of North Sea gas to a market in Western Sweden.Liquid Nitrogen (LIN), produced onshore, is loaded into an LNG carrier. This ship, upon whose deck is mounted a gas processing plant, travels offshore and moors at a single point mooring (SPM) located adjacent to a production platform (Figure 1). Offshore gas is transferred through an above-water hose, to the on ship plant, in which it is liquefied by heat exchange with LIN and mechanical refrigeration, and loaded into the ship's storage tanks. When the LNG carrier is fully loaded, it returns to shore, discharges its cargo of LNG and reloads with LIN (Figure 2). The cycle is then repeated.The system uses only proven components and technology. Several offshore fields may be served and the LNG product delivered to any suitable onshore terminal. By producing the LNG on the ship, the fixed offshore investment in the SPM and its associated pipeline is relatively small and additional, expensive and permanent offshore structures and services are unnecessary.In anticipation of the arriva1 of natural gas in Sweden many studies of gas supply, transportation and distribution are being made, An additional source of gas, delivered as LNG, would supplement the pipeline supply and provide a means of satisfying 'the substantial variations in demand which appear likely over the year.Offshore, marine, process and cryogenic engineers from AGA AB, John Brown Subsea and Kockums AB undertook this study under a Project Manager from Swedyards Corporation.THE STUDYIt was assumed that 100 MMSCFD of offshore gas is available. Several sources of North Sea gas of a suitable size were identified. Typical gas compositions used in the study are given in Figure 3. The case studied has limits which are, on the one hand, the outlet from a gas/oil separation plant on an established offshore platform and, on the other hand, the point at which pipeline quality gas is fed into an existing main gas pipeline onshore. The components of the system are:–A sea-bed pipeline and export riser–An SPM with mooring and gas-loading equipment–An LNG carrier with a gas processing and liquefaction plant on its deck–An onshore LNG terminal with LIN production and storage facilities. Keywords: recovery, sweden, gas monetization, terminal, energy balance, spm, liquified natural gas, upstream oil & gas, cold box shuttle, midstream oil & gas Subjects: Processing Systems and Design, Natural Gas Conversion and Storage, Liquified natural gas (LNG) This content is only available via PDF. 1982. Offshore Technology Conference You can access this article if you purchase or spend a download.