The DeepCRETE cementing slurry system is a member of the CemCRETE family of products, which are in turn based on Advanced Cement Technology from Schlumberger. DeepCRETE makes use of engineered-particle-size-distribution, whereby smaller particles fill the void space between larger particles, resulting in a slurry requiring less water. The smaller particles within the cement are further engineered to contribute to both the slurry and the set-cement properties, leaving water as a reactant and carrying agent. This is all achieved whilst retaining the cement properties most valued in hydrocarbon exploration application—density that is disconnected from rheology, lower permeability, higher and faster compressive strength, improved mechanical durability, improved injectibility for remediation, and improved field operations.
Drilling the shallow strings in deepwater environments usually means cool seafloor temperatures. Normal density slurries can require more than 24 hours to develop adequate strength in these conditions. Even then they may suffer losses and require top-out jobs that further delay operations. In some cases they may never develop sufficient compressive strength.