612WAB® enables critical isolation in deep water application

Challenge
Zonal isolation
Sub Standard Graphics 3D JCO151381 00000
  • WELL TYPE Heavy oil producer
  • RESERVOIR TYPE Sand
  • PRODUCT / PLACEMENT 612WAB / open hole
  • SUCCESSFUL WATER ISOLATION Reaches planned production plateau earlier
  • ENHANCED WELL CONSTRUCTION REDUCES Risk of water production
  • CAPEX & OPEX Effective Zonal isolation increases reserve recovery
  • WELLTEC AND CLIENT COLLABORATION Upgraded qualification enables flexible deployment
  • LOCATION Congo

Background

An IOC in Congo had cement placement concerns due to a combination of 6 ½” open hole across a short, deviated reservoir section and 4 ½” liner, therefore resulting in low volumes of cement across this deviated section.

Conventional solutions considered would result in increasing cement volume:
Under reaming to 7 1/8” = extra rig time
Shoe track extended = breakthrough into the oil / water contact

Within this challenging application, zonal isolation was critical to optimizing acid stimulation pre-flush.

Solution

The Welltec Annular Barrier (WAB) forms a combined barrier with cement for acid stim and water isolation. WAB installed and expanded on a single trip with liner hanger.

Operation

Caliper log run indicating good hole at WAB setting depths.

Qty three WAB made up as part of the liner BHA, spaced out for zonal isolation and water isolation. Plug bumped and all WAB expanded, quickly under surface control, in wet cement.

Welltec

WAB for slim hole cement assurance prevents water production.

Challenge
Zonal isolation
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