When multiple CE-BOND tools are run across critical zones, the flow diverter elements operating in series serve to eliminate high-side channelling effects by equalising fluid velocities on the high-side and low-side of the wellbore.
The flow diverter element uses an atmospheric buoyancy chamber to self-orientate onto the high-side of the wellbore. The tool is a 1-piece design, manufactured from advanced composite materials meaning that it is extremely lightweight but immensely robust.
The operating concept behind CE-BOND has been verified both by advanced Computational Fluid Dynamics (CFD) modelling, and also during physical 1/3rd scale flow loop testing performed at our Aberdeen facility.
Equalizing fluid velocities on the low-side and high-side of the wellbore delivers a step-change both in terms of hole cleaning efficiency prior to the cement job, and in terms of cement bond quality around the casing. Physical flow loop testing has shown an increase in hole cleaning efficiency in horizontal hole from 2% to >95% efficiency.
Due to the short tool length and optimised flow area, the pressure drop introduced by each CE-BOND is low: typically <0.07 bar, (1 psi) per tool when circulating at @ 1,430 lpm (9 bpm). The cumulative pressure drop introduced by running multiple CE-BOND tools is therefore acceptably low, but it should be noted that in most cases the improved hole cleaning efficiency and associated cuttings bed height reduction will result in a net reduction in ECD.