- Type: Oil reserve
- Production: 25,000 barrels of oil per day (bopd) achieved in July 2018
- Discovered: 1972
- Gross 2P Reserves: 45.4 mmbbls
- Location: 92km NW of Warri
- Reservoir Depth: 7,600–8,900ft
OML 40 was awarded to SPDC in 1962; the Opuama field was in production from 1975 until 2006 and during that period produced 43.4 mmbbls. In 2006, SPDC undertook a controlled shut down of OML 40, with Elcrest Exploration & Production Nigeria Limited subsequently purchasing a 45% interest in the OML 40 licence in September 2012.
The Opuama field was returned to production in February 2014 with the Opuama-1 well. Further infill wells were completed on Opuama-3, Opuama-7, Opuama-8, Opuama-9 and Opuama-10 between April 2016 and August 2018.
The reservoirs contain light crudes with API gravities ranging from 47.5° in the shallow reservoirs to 37.8° in the deep and saturated reservoirs. There has been very little pressure depletion over the 30 plus years of production, which indicates a strong aquifer support and consequently leading to very high total ultimate oil recoveries.
Infrastructure and Export
Oil can be exported by two routes: either via the Shell-operated Trans Escravos Pipeline network running from the Opuama field south along the coastline to the Forcados Oil Terminal, or via shipping to an offshore FPSO.
The Opuama-7 sidetrack completed in November 2017 and proved to be an excellent well, delivering initial production rates some 25% ahead of pre-drill expectations.
Opuama-8 was the first new well to have been drilled in the Opuama field since 1980, and resulted in another success with initial flow rates in excess of 6,500 bopd.