Wish Bone Honer

Cleaning barium sulfate scale from SSSV

Background

On a platform in the UK North Sea, routine integrity testing of Subsurface Safety Valves (SSSV’s) indicated that one specific valve was faulty. It was established that the failure to operate was due to a buildup of barium sulfate scale, which is an extremely hard compound to remove. Traditionally, the operator would remove barium sulfate scale using coil tubing; however, a large crew and equipment footprint was not feasible for this intervention. With the prospect of having the well closed in for a prolonged period caused the operator to look for an innovative alternative.

Operation

Based on previous experience gained using Welltec® to recover sand from another well, an intervention was planned using the Well Tractor® combined with the Well Cleaner® Wishbone Honor (WBH), a rotating brush to clean the valve recess. Upon the second run, the scale was removed; the valve was tested and returned to full functionality.

Achievements

Significant cost-saving due to applying wireline service.

Quicker rig-up and run times.

Well downtime reduced by 14 days.

Avoided the use of heavy equipment with much larger footprint.

Tools Applied

  • Well Cleaner® Wishbone Honer (WBH)

    The Well Cleaner® Wishbone Honer (WBH) is designed to clean deposits from tubular walls over intervals where the internal diameter changes, such as mandrels and profiles.

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  • Well Tractor®

    The Well Tractor® was regarded as a revolution in the industry when it was introduced in the 1990’s. It enables operators to extend the reach of traditional e-line deployment into highly deviated and horizontal wells.

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