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Patch over perforations before drilling operations

Saltel Patch enables cement repair and provides fullbore access to continue drilling

 

  

Setting of a customized Saltel Patch over casing perforations at 560 ft (170 m) allowing drilling BHA to pass through a 12 ft/4 m 9-5/8 in patch customized with a thinnest sealing element.

Context
In a new well, the cement between the 9-5/8 in casing and the wellbore was incomplete, the client had to perforate the casing to re-cement. The major concern of the client was to cover the perforations and then being able to pass thru with the directional drilling BHA (2° bent angle motor on a 8-3/8in drill bit).

Analysis
The casing is a 9-5/8in - 36 lbs/ft, with a nominal ID of 8.921 in (226.59 mm). Setting a standard 9-5/8 in Ultraslim patch was not possible, due to the small ID of the set patch.
R&D analysis led to manufacture a customized 9-5/8 in Ultraslim patch. The thickness of the sealing element was reduced to 1.5 mm (0.0509 in) instead of 2.25 mm (0.088 in).
The expansion was done in 2h, on a 24h drilling Rig. The patch was positioned by wireline, and pressure tested up to 1.500 psi (10.3 Mpa) solid for half an hour.
The 8-3/8in drill bit and 2° tilt angle passed through the patch (drift ID 8.411in / 213.63 mm) with slight dragging (8,000 lbs) and the well was successfully drilled as planned.

Result
The perforations were successfully sealed and the drilling BHA passed through the patch. The client resumed Drilling Operations.

Conclusion
With a customized analysis from Saltel Industries R&D Dpt, we can get an adequate ID and match the client requirements. In this specific case, the Saltel Expandable Steel Patch (Saltel Patch) was the only product able to meet such expectations.

 

 


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