What is the greatest challenge that you have faced while developing a karstic reservoir?
In the Tahe Field, production challenges include isolated caves, bypassed oil due to high-permeability fracture corridors, and pockets of attic oil (Fig. 1).
By converting a production well into a water injector, the engineers at Tahe forced oil out of the lower caves, along the vertical fracture network, and into the upper caves (Fig. 2). The attic oil problem was overcome by using nitrogen injection to create secondary gas caps, thereby pushing oil down to the perforated interval (Fig. 3). At Tahe, these methods yielded an incremental oil recovery of 5%.
The Digital Analogue Knowledge System (DAKS™) contains many global oil and gas analogues specifically focused on Karstic Reservoirs. Use these analogues to benchmark your own field, and delve into C&C Reservoirs Reservoir Evaluation Reports to discover best practices from top performing reservoirs that can be applied to your own assets.