CX™ - Drop Drift Cleaner

CX™ - Drop Drift Cleaner

During a long-standing P&A abandonment campaign, a North Sea operator approached Coretrax™ as they were facing challenges with their drill pipe cleaning. When placing their cement plugs, they needed to pick up above top of cement before circulating foam wiper balls to clean the drill pipe. This meant that the first 1,000ft of drill pipe remained unwiped. They were then re-running this pipe at a later date and cleaning it by circulating foam wiper balls. The operator felt this was an area of the operation which could be streamlined as they were spending too much time cleaning and drifting the drill pipe.

Coretrax™ developed the Drop Drift Cleaner Package as a solution to this common problem. The Drop Drift Cleaner package consists of a drop drift brush and a land out sub. The land out sub is pre-installed in the drill string before running in hole. Following the cementing operations, the drop drift brush is dropped from surface and free-falls through the drill string before landing out in the bespoke internal profile of the catcher sub. The drill pipe is then pulled out of hole and the catcher sub broken out at surface before deploying a foam wiper ball to clean the remaining drill pipe without disturbing cement.

The drop drift brush consists of a weighted bullnose and handle with a bristled cleaning element providing 360-degree coverage and giving the flexibility to pass through tool joint restrictions. The high memory bristles allow the drop drift brush to be used multiple times before replacement.

Since the first run of the Drop Drift Cleaner for this operator in December 2015, they have continued using the package on a further 24 wells saving this operator more than 100 hours. Following the success of the Drop Drift Cleaner the package has been adopted by a number of operators, further continuing its success in both the UK and Norwegian sectors.

Highlights:

  • Provides 360-degree coverage for cleaning and drifting
  • Flexible, high memory bristles allow the drop drift brush to pass through toll joint restrictions unaffected
  • Can be stored on the rig and used multiple times

Time Savings:

The Drop Drift Cleaner package presents significant time savings by eliminating the requirement to re-run un-cleaned and un-drifted drill pipe. Operators have claimed time savings of 6-8 hours per application based on using the DDC for the first 10 stands of drill pipe and the DDC has been used to clean larger sections of drill pipe. Since it’s launch in December 2015, the DDC has saved operators more than 17.45 days rig time.

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