Dual 1214WAB® deliver critical cement assurance in sidetrack
- 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
