CircSub speeds North Sea downhole clean-up operation

Churchill Drilling Tools has issued details of a recently completed wellbore clean-up operation on an exploration well in the North Sea, using its DAV MX CircSub system.

Offshore staff

ABERDEEN, UKChurchill Drilling Tools has issued details of a recently completed wellbore clean-up operation on an exploration well in the North Sea, using its DAV MX CircSub system.

The tool was employed for hole cleaning and BOP jetting, but first needed to be sufficiently resilient to withstand 113 bbl of 1.6SG cement slurry so that the operator could spot a temporary cement plug.

Once spotting was complete, Churchill deployed one of its “smart darts” to activate the DAV MX, allowing the operator to hole clean at 3,500 l/m.

The client then completed five jet passes of the BOP removing debris which could impact its performance.

According to the operator, this approach allowed it to eliminate an extra trip in hole that would have been necessary using a dedicated clean-out assembly and provided rig time savings of more than six hours.

08/16/2018

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