The operator’s concerns
In a geometric completion with perforation clusters every 23.5 ft, long drilling fluid channels behind the casing would enable fracturing fluid and energy to migrate far from the intended cluster, reducing fracturing efficiency, reservoir contact, and well production potential.
Industry-accepted cementing best practices including running centralizers.
What Schlumberger recommended
Add Fulcrum technology to the cement in four wells on the pad to react with leftover drilling fluid and cement the other two pad wells conventionally. Then assess the cementing performance with the USI ultrasonic imager
and, after multistage fracture stimulation, monitor and compare well production.
What the technology achieved
Logs indicated a well cemented conventionally had long channels behind the casing, where the well cemented with Fulcrum technology had small pockets of lower-quality cement but no long channels that would permit fracturing fluid migration between stages.