parted casing repair with casing patch

Parted casing or tubing

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Cover parted section with casing patch

Challenge

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: 

Parted tubing
  • 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 parted 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 the stripper and a consequent loss of containment.

Solution

Saltel Patch has proven its sealing efficiency against the parted tubular. Once installed, the 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.

Saltel Patch has also proven excellent resistance to temperature cycling. Extreme high-temperature patches were installed with success to repair 7in and 9-5/8in parted casings in Canadian CSS (Cyclic Steam Stimulation) wells, where temperature cycling is essential. Saltel casing Patch confirmed strong resistance in CSS wells.

Then, Saltel Patch has demonstrated an optimized profile of its BHA to enter the parted section. The bottom of BHA has a good entry guide profile to reach setting depth, even in a parted section. This statement is valid only if the misalignment of the parted sections remains minimal.