On Assessing a Potential Reuse of the Indonesian Post-Operation Offshore Oil/Gas Pipelines as A Cold-Water Pipe for an Ocean Thermal Energy Conversion (OTEC) System: A Thermal and Fluid Dynamic Perspective

Authors

  • Mukthasor Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
  • Arfie Ikhsan Firmansyah Research Centre for Energy Conversion and Conservation (PRKKE), National Research and Innovation Agency (BRIN), B. J. Habibie Science and Technology Park Bldg. 620, South Tangerang 15314, Province of Banten, Indonesia
  • Dendy Satrio Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
  • Shade Rahmawati Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
  • Rehan Shadiq School of Engineering, University of British Columbia, Okanagan Campus, 1137 Alumni Avenue, Kelowna, BC, Canada
  • Omar Yaakob Faculty of Mechanical Engineering and Marine Technology Centre, Universiti Teknologi Malaysia, Malaysia

DOI:

https://doi.org/10.37934/arfmts.123.1.5368

Keywords:

Decommissioning, offshore platforms, OTEC, CWP, CFD simulation, renewable energy, energy transition, ocean energy

Abstract

One of the main issues arising in offshore oil and gas decommissioning is associated with significant required costs. Research assessing the potential reuse of the post-operation offshore oil and gas pipeline (POGP) in Indonesia for the Ocean Thermal Energy Conversion (OTEC) system offer double the potential cost reductions in POGP decommissioning and OTEC development. In the context of OTEC development, research on increasing system efficiency makes a significant effort by modifying working fluids and usually by employing the assumption that the temperature of the cold seawater at the surface outlet of the Cold-Water Pipe (CWP) is practically the same as that at the inlet of the CWP at a depth of about 900 m. Unfortunately, this was not the case when the POGP was to be reused for the OTEC system because there was difficulty in applying additional insulation to the existing subsea pipelines. The temperature change in the cold seawater is even more critical considering that oil and gas operations at a depth of 900 m could be associated with more than 60 km of pipeline length to reach an onshore system for a typical seabed bathymetry. This paper assesses the potential reuse of the POGP as a CWP for the Ocean OTEC system. The temperature distribution within CWP is analyzed using a thermal and fluid dynamics approach. The results show that the reuse of POGP for the OTEC system could offer an excellent opportunity for capital cost reductions because the POGP has a remaining service life of over 20 years. However, the results of the analysis of heat and mass transfers show that the temperature change in cold seawater at CWP is about 3 to 6 oC, depending on the technical scenarios of the pipelines. The POGP used in the OTEC system could be suitable for a 20 kW OTEC system with practically no cost of pipelines, which usually accounts for a significant investment cost.

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Author Biographies

Mukthasor, Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia

mukhtasor@oe.its.ac.id

Arfie Ikhsan Firmansyah, Research Centre for Energy Conversion and Conservation (PRKKE), National Research and Innovation Agency (BRIN), B. J. Habibie Science and Technology Park Bldg. 620, South Tangerang 15314, Province of Banten, Indonesia

arfi004@brin.go.id

Dendy Satrio, Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia

dendy.satrio@its.ac.id

Shade Rahmawati, Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia

shade@oe.its.ac.id

Rehan Shadiq, School of Engineering, University of British Columbia, Okanagan Campus, 1137 Alumni Avenue, Kelowna, BC, Canada

rehan.sadiq@ubc.ca

Omar Yaakob, Faculty of Mechanical Engineering and Marine Technology Centre, Universiti Teknologi Malaysia, Malaysia

omar@fkm.utm.my

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Published

2024-10-30

How to Cite

Mukthasor, M., Firmansyah, A. I., Satrio, D., Rahmawati, S., Shadiq, R. ., & Yaakob, O. . (2024). On Assessing a Potential Reuse of the Indonesian Post-Operation Offshore Oil/Gas Pipelines as A Cold-Water Pipe for an Ocean Thermal Energy Conversion (OTEC) System: A Thermal and Fluid Dynamic Perspective. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 123(1), 53–68. https://doi.org/10.37934/arfmts.123.1.5368

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