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Case Study: first patch set in New Zealand


Context1st ses patch in New Zealand

In a 9 year-old well, a communication between the 5-1/2in production casing and the 9-5/8in annulus had to be located then shut off.The objective was to cover and seal off the hole using a Saltel Expandable Casing Patch, allowing the completion to be run through the patch.





Split Casing

The depth of the leak was not known before the job; a 5.5in Reinforced SES Patch was selected in case the damaged zone had been located deep in the well, which would have require a high collapse pressure.A multi finger caliper log allowed to locate the hole in the production casing 25.7m below the Tubing Hanger.The patch and setting BHA were conveyed with 2-7/8in tubing on a service rig and positioned by tubing tally.




The patch was rigged up, positioned, installed in 12 expansions, and drifted at 4.331in without issue in less than 3 hours. It was then pressure tested solid at 1,550psi for 10min. Finally the completion was set back into the well.