Decommissioning Platforms

Requirement:

For decommissioning platform wells Mirage designed a system for drilling and pinning the multiple casing strings. This has now been used extensively around the world.

Location:

North Sea – UK & Norway, Gulf of Mexico - surface and sub sea

Equipment:

Mirage DDU1636 drill pinning machine and BS3248ss sub-sea band saw with ROV cutting operations.

Method:

For surface cuts the drill unit has a split joint that is clamped onto the casing and then an auto feed system to feed the cutter through, while the band saw has a mechanical vice jaw that clamps around the casing and then an auto feed system to feed the blade through. A 48” multiple casing is drilled in approx 15 minutes and cut in approx 40 minutes, giving a fast, efficient, cost effective cold cutting method for inserting lifting pins into multiple casing strings and cutting multiple casing strings with or without grouted annuli.

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