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Enhanced Gas Recovery from Resurrecting a “Dead” Well: A South African Case Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
The F-A was the anchor field, developed in 1992, providing gas and condensate feedstock to PetroSA’s Gas-to-Liquid Refinery in South Africa, and is nearing depletion.
F-A is subdivided into six sectors. The North Sector comprises the “discovery well” F-AR1, the two production wells F-A07P and F-A09PZ3, and is deemed to be isolated from the rest of the F-A field.
In 1996 F-A09PZ3 was shut in due to high water production after producing 20 Bscf over 2 years followed by F-A07P in the same reservoir, which also stopped producing gas in 2008 due to high water production. By utilizing a revised operating strategy, F-A07P was brought back into production in 2015 for a period of 10 months. Because F-A09PZ3 and F-A07P are producing from the same reservoir, it was decided to re-evaluate the potential of F-A09PZ3 after 20 years.
In 2017, F-A09PZ3 was successfully restarted. The integration of production and geoscience data led to a successful operating strategy for the “resurrection” of the “dead” production well. This resulted in a cost effective solution to access gas resources, albeit small, which repaid for the intervention in 3 days. The well has been producing for 5 months to date.