JPT Cementing/Zonal Isolation

Gunnar DeBruijn, Principal Instructor, Schlumberger 

Zonal isolation achieved with cement remains fundamental to well integrity for the full well life cycle. As I read through the abstracts and papers that have been presented in the past year, I notice several key themes: verification of cement placement, development of new materials as a barrier, development of new additives to improve the cement barrier, and enhancement of existing techniques. The fact that we are still studying and improving the cement barrier underscores how important it is as wells are pushed to new limits. From our surface observations, surface sensors, and equipment performance, we can anticipate where zonal isolation is expected. With a robust cementing process embedded in the drilling process, we can be confident in the placement of the barrier.