Downhole Casing Repair

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Casing repair is an important part of the oil drilling process.
Casing repair is an important part of the oil drilling process. (Image: Texas Oil Derrick image by bawinner from Fotolia.com)

Casing in an oil or gas well can be damaged during the drilling or servicing of a well or can deteriorate during the life of a well. In either case, casing repair is required.

Casing Strings

When a well is drilled there are multiple strings of casing of various sizes that are installed in the well starting from the largest to the smallest diameter--one being installed and cemented inside another. Occasionally during the process of drilling or completing the well, casing can be damaged which results in a decrease in the expected performance and life of the casing.

Casing Patch

To repair the "bad spot" in the casing, a casing patch can be installed. One style of casing patch utilizes a packer equipped with seals which anchors the patch. A packer is a device that can be set at a particular depth and is conveyed by wireline, coiled tubing or drill pipe.

Expandable Patch

The state-of-the-art casing patch is an expandable patch requiring no packer to place and hold the patch on depth. It is a combination of a steel pipe and sealing elements which can be expanded across the damaged casing with a tool called an expander mandrel, usually conveyed by drill pipe.

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