2021 Volume 86 Issue 1 Pages 5-20
Iwaki-Oki Gas field was a project jointly developed by Teikoku Oil Co., Ltd.（currently INPEX CORPORATION）, Esso Exploration Inc.（currently Exxon Mobil）, and East Japan Oil Development Co., Ltd. Since the successful drilling / discovery of hydrocarbon reservoirs in 1973, a total of 9 exploration / appraisal wells have been drilled, evaluated and abandoned. After these appraisal campaigns, a platform was installed in 1983, and production began in July of the same year while simultaneously drilling and completing total of 15 development wells in 1984. Production from Iwaki-Oki platform ended in July 2007, and the wells were plugged and abandoned, then conductor pipes were cut and recovered in the same year. The platform was unmanned in 2008, and preparatory work for platform removal from the end of 2009. The platform decommissioning work was carried out at July 2010. At that time, these works were recorded in a video for future reference. In the 2020 JAPT symposium, we released this recorded video since the decommissioning of the offshore platform is rare in Japanese oil companies, and we hope that this video will give oil / gas development companies an idea of the work and will serve as a reference for the companies in the future.
