At a recent dinner hosted by the Aberdeen Young Professionals (YPs) Section, YP Olu Daini, an operations reservoir engineer with Talisman Energy, spoke about the redevelopment of Saltire, a mature UK North Sea oil field. The Saltire field was discovered in 1988 and is located four miles southeast of Piper Bravo platform. Owned and operated by Talisman Energy, its facilities are located on a 24-slot platform, including eight producers, down dip water injection and gas lift. First oil was achieved in May 1993.
Saltire’s production had dropped from an initial plateau level of 40,000 BOPD in 1998 to less than 10,000 BOPD by mid-2004. Olu outlined how application of good oilfield practices over the last few years has successfully enhanced production from this mature asset, such that a 60% recovery factor was realized by early 2007. This impressive recovery was achieved through a three-pronged approach: facilities reinstatement, a concerted wellwork campaign, and good reservoir management.
The wellwork campaign consisted of low-cost well interventions such as the identification and preferential isolation of high water-cut zones and gas lift optimization. This was complemented by regular subsurface well reviews, an extensive data gathering exercise, and critically of course, by effective teamwork with buy-in from all stakeholders.
Olu concluded by saying the incremental production achieved on Saltire proves that, when planned and executed as a concerted campaign, minor well interventions—in this case including water injection and gas lift optimization—can result in a significant increase in oil production and extend field life by many years. Talisman Energy has an ongoing commitment to maximize the value of the Saltire field. Special thanks to Talisman UK for sponsoring the event.
—Anthony Onukwu, Eclipse Petroleum Technology