Dual 1214WAB® deliver critical cement assurance in sidetrack

Challenge
Well construction & integrity
WAB - Welltec Annular Barrier - case story JEG143126
  • Well type Hydrocarbon producer
  • Reservoir type Sand
  • Product / placement Within 12 1/4" open hole
  • Isolation of water breakthrough Via dual WAB placement within open hole
  • Wab fullbore id enables sidetrack Without changes to the lower completion design
  • Well production reinstated As a direct result of dual WAB solution
  • Location Africa

Background

On a previous drilled well, due to poor cement as a result of formation issues, scaling water flowed from shallow of the 9 5/8” shoe into the depleted hydrocarbon producing sand. The well was lost and abandoned after 18 hours of production.

As a result, the subsequent sidetrack well incorporated two 1214WAB within the 12 1/4" open hole section, in combination with cement to provide a permanent barrier to flow of scaling waters.

Operation

Dual 1214WAB’s were deployed as part of the new 9 5/8” production casing, and ran through the milled window section within the 13 3/8" casing and into sidetrack 12 1/4" open hole section.

The primary cement operation was conducted and the dual 1214WABs were expanded within green cement against the bumped cement plug. The 1214WABs set in 12 ¼” section at 10,273 ft and 10,199 ft, effectively straddling the scaling water producing zone.

Achievements

Through provision of permanent to water breakthrough, Welltec® Annular Barrier (WAB) technology has allowed for uninterrupted production form this sidetracked well, and provided additional confidence for the operator that a permanent barrier is in place.

First deployment WABs through a milled out window in a sidetrack application.
Provide reliable production for the operator.
Avoid cost of drilling a new well.
Production data confirming no scaling water produced
WAB seal verified in open hole.

The WAB’s robust design, allows for deployment through a milled window to prevent scaling water flow across a thin shale.

Well schematics

1036X518 Jeg143126 00000 Min