Published on 25 avril 2018
Successful Patch through Patch operation
After a 1st patch covering a split casing, a 2nd patch was successfully installed below, to isolate off-depth perforations.
The client’s first issue was a split casing, successfully repaired with a patch. 3 months later, a perforating gun fired off depth below the patch, prior to fracturing operations. A second patch (6m 5.5in slimline) had to be run through the set patch to cover the unwanted perforations.
A 1st patch (17.5m 5.5in reinforced) was set across a split casing. The split could open during the fracturing, and the patch would have been unsupported. A cement squeeze job was then performed prior to running the patch.
Amongst the many original qualities of this casing patch is the large ID when set, making it possible to run perforating guns, plugs, or other tools through it. The second patch was run through the previous one and installed to seal off the perforations.
The well was then fractured in 52 stages, at 5,670psi. An average of 365,000lbs of sand were pumped in each stage.