Days of Pit and Pontoon Tank Cleanup Time Eliminated | SLB
Tech Report
Location
Norway, Europe, Offshore
Details

UK North Sea

Background

An operator challenged M-I SWACO, a Schlumberger company, to clean a semisubmersible’s 13 mud pits, 5 sandtraps, and a 2,800-bbl [445-m3] pontoon tank and reduce confined space entry time, overall cleaning time, and generated wastewater and slop. Rather than perform cleanout in the traditional manual method, M-I SWACO recommended the ATC technology for the job. Such a task traditionally takes several days to be completed. ATC technology only requires 44 bbl [7 m3] of washwater that is continuously cleaned and recycled throughout the cleaning process.

Products Used

Days of Pit and Pontoon Tank Cleanup Time Eliminated

Use of ATC technology reduces produced slop and washwater

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The ATC unit was rigged up using a temporary setup requiring minimum modification or installation to the rig. The 18 pits were cleaned in 61 h 45 min (average time per pit of 3 h 50 min). The pontoon tank was cleaned in 12 h 40 min rather than days using only 44 bbl [7 m3] of washwater. The final total volume was 135 bbl [21 m3] for all 18 pits and the 2,800-bbl [445-m3] pontoon tank. A total of 52.1 tonUK of barite solids was removed.
Products Used

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