Investigation of a Powerful Tool for the Development of Thinly Bedded Carbonate Reservoirs

In thin-layered reservoirs, drilling engineers face tough challenges—planning their drilling programs tofollow the most productive reservoir layers while avoiding nearby water, gas or high-pressure zones.The rewards for a successful drilling strategy are clear—increased oil production and reduced watercut. In an oil field in the Persian Gulf, for example, oil production was increased four- to six fold andwater cut reduced by one-third using the latest formation modeling and geosteering techniques. Untilrecently, drilling thin layers was extremely difficult. Traditional geometrical drilling trajectories wereunable to match the subtle variations in layer dip and depth, so many wells left the target zone andencountered watered-out layers. This paper has implemented modern geosteering methods to givedrillers much greater control and help change the way operators develop thin-layered oil reservoirs,enabling them to increase hydrocarbon recovery and reduce water cut.