Case Study No 9 – Production Operations – Ohanet Field – Algeria
The Ohanet Filed is remote wet gas field located in Algeria about 900 km south east of Hassi Messaoud close to the border with Libya. The plant was built by BHP Billiton and Sonatrach under an Resource Sharing Contract (RSC) contract and started production in 2003. At plateau rate the field produced about 145,000 BOE (about 55,000 bbls of condensate and LPG and the rest in natural gas). The Ohanet field consisted of 48 wells tied back to a Central Processing Facility (CPF). The CPF contained inlet gas compression (commissioning in 2008), two 50% cryogenic processing trains, CO2 removal, condensate storage and gas export compression plan.
ASG’s Tore Vartdal worked as the Operations Director (Directeur du Champ) on site for four years from 2006 to January 2007 to May 2009 the Total Recordable Injury Frequency Rate (TRIFR) reduced from 11.6 to 0.6. This was achieved in a multi-cultural and multi-national environment with about 280 people on site and working about 1.3 million man-hours per month. During his time at Ohanet he also had the overall responsibility for planning and completing two major plant turnarounds each lasting about 4 weeks. As part of the original development plan, BHP Billiton had to drill four additional production wells and tie these back to the CPF. This was completed on time and on budget.