Improving Well Integrity

Downhole flow diversion technology

CE-BOND

CE-BOND is the first product to apply Centraflow’s patent-pending downhole flow diversion technology. 

Run as part of a casing or liner string in deviated or horizontal wellbores, CE-BOND delivers full circumferential cement bond around the casing.
The Circumferentially Enhanced Bond Tool (CE-BOND) functions by positioning a flow diverter element on the high-side of the wellbore in the casing to openhole annulus.


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.

CE-BOND Benefits:

  • Improved Well Integrity.
  • Removal of ‘low-side debris’ prior to cement job (cuttings bed, excess filter cake etc.).
  • Net reduction in ECD on wells which contain a residual cuttings bed.
  • Full cement bond coverage achieved in zones where CE-BOND is run:
    • Zonal isolation (gas/oil/water-bearing zones).
    • Casing shoe isolation.
    • Elimination of sustained annular pressures.
    • Simplified P&A operations at end of field lifetime.
  • Improved likelihood of meeting regulatory requirements for ‘good’ cement bond logs on critical strings.
  • Eliminates costly and time-consuming remedial cementing operations.
  • Reduced lifecycle well costs.
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CE-BOND Features:

  • Manufactured from advanced composite materials.
  • Robust design – no ‘non-drillable’ parts with potential to become lost-in-hole.
  • Safe and simple installation.
  • Operates automonously - flow diverter element self-orientates using buoyancy.
  • No ‘critical path’ rig time required to run CE-BOND.
  • No time impact on normal cementing operations.
  • Tools under development to suit 13-3/8", 10-3/4", 9-5/8" and 7" casing strings.

CE-Bond FAQ's can be found here. 

CE-BOND is particularly effective in the following applications:

  • Achieving zonal isolation between production and/or water zones.
  • Isolating the previous casing shoe to eliminate Sustained Casing Pressure.
  • Preventing out-of-zone injection on Injector wells.
  • Production casing/liners set across long, highly deviated or horizontal hole sections.
  • Wells with shallow reservoirs.
 
  • Wells in which the intermediate casing string has to function as a well barrier due to gas lift.
  • Multi-lateral (MLT) wells, where the casing above the MLT junction needs to be effectively cemented.
  • Preventing hydrocarbons from entering the water table (eliminating pollution of water wells).
 
 
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