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An operator working in Kenya was preparing to cement the 7-in. casing section of a new well. While running the casing however, the operator began to experience severe lost circulation issues, and had to reestablish circulation after each casing joint was run in-hole. This indicated to the operator that the fracture gradient (FG) was lower than previously thought—which was verified through subsequent analysis—and it became clear that the planned cement program would exceed the FG, leading to lost circulation and failed zonal isolation.

With only two days until cementing was scheduled to begin, the operator asked Baker Hughes, a GE company (BHGE) for a re-designed cement program that would achieve the necessary zonal isolation and prevent losses.

After working with the operator’s team to re-design the cement slurries—using CemFACTS™ and WellTemp™ software to analyze the new data—BHGE recommended the SealBond™ LT cement spacer system with the SealBond Plus additive in a ratio of 10 pounds per barrel. The system forms a permeable seal over the formation, mitigating lost circulation issues during cementing and reducing cement loss and formation damage. It helps reduce filtrate invasion, prevent cement fallback, and increase equivalent circulating density (ECD) at casing depth in wells where the fracture gradient limits the design of the cement density. Additionally, the Fiber™ lost circulation material would be pumped at 1 pound per barrel with the cement slurry to mitigate losses during the cementing operation.

Download the PDF to read the full case study.