Cover parted section with casing patch
Challenge
What does parted mean? The parted casing is the result of a tubular exceeding its mechanical limits due to overpressure rates during stimulation, excessive loading, or tectonic movement. When it comes to cases of parted casing string, the separation usually occurs at the coupling. It can be due to:
- a fracture
- the stripping of the threads
- the collapsing of the end of a joint
- the expanding of the coupling
- two or more of the above factors, in combination.
A sudden loss of weight and a decrease in circulating pressure usually means the pipe has broken downhole. Care is necessary when pulling out of the hole after the tubing has parted since there is no BHA to prevent the broken pipe from being pulled right out of the stripper and a consequent loss of containment.
Solution
Saltel Patch has proven its sealing efficiency against parted casing or tubing. Once installed, Saltel Patch sealing design allows relative displacement. That means the parted section will slide around the patch without damaging the seal in case of thermal expansion of the tubular during production. our Expandable steel patch reinforces cement squeeze, and repairs parted casing.
The Saltel Patch has been tested and proven to be extremely resilient to fluctuating temperatures. It was successfully installed in 7in and 9-5/8in casings of Canadian CSS wells, where temperature cycling is necessary. The Saltel casing patch was able to provide the wells with a high level of resistance to temperature cycling.
Then, Saltel Patch has demonstrated an optimized profile of its BHA to enter the section. The bottom of BHA has a good entry guide profile to reach setting depth, even in a parted section. In order for this statement to be valid, it is imperative that there is a minimal amount of misalignment in the parted casing.
