Case study: Coretrax patches well casing affected by corrosion

Nov. 21, 2022
Coretrax has completed a multi-product project for a major North Sea operator to eliminate casing string replacement.

Offshore staff

ABERDEEN, Scotland  Coretrax, a provider of well integrity and production optimization services, has successfully delivered a casing integrity solution for a major North Sea operator, eliminating the need for a casing string to be replaced.

The project, completed in five days, saw a team of three Coretrax engineers identify the trouble zone and subsequently mobilize and install a short patch on a casing section of a well affected by corrosion.

The work allowed the operator to continue operations with minimal disruption and downtime.

To pinpoint the trouble zone, the team initially deployed its CX-RTP (retrievable test packer). The RTP technology is a heavy-duty service packer and was used to set and pressure test a range of depths to identify the area requiring to be patched.

Following the identification of the zone affected by corrosion wear in a 13 3/8-inch 54.5 casting at circa 150 ft, Coretrax deployed its 10-3/4-inch ReLine HYD expandable casing patch to isolate the area and regain well integrity, eliminating the costs of a replacement of the casing.

The ReLine HYD expandable tubular solution provides minimal loss of inner diameter, minimizing restrictions for future well operations. The expansion system uses hydraulic pressure to pump the expansion cone from the bottom of the liner to the top. This technology was effectively deployed to isolate the affected zone in the casing string and allow drilling operations to proceed.