Barium sulphate scale removal offshore
Pressure<12 kpsi / 830 bar
Additionally LMMV bonnet and stem requires changed-out, 2 plugs are required to complete this work scope (1 being set in the downhole safety valve nipple).
It was a Normally Unmanned Installation (NUI) Platform, so there was limited space, and only day shift operations.
Tubing hanger ID restriction limited milling bits (3.9” hanger restriction, WR-SCSSV No-Go 3.86”).
Tapered milling bit was replaced with the expandable milling bit which cleared the path. The expandable milling bit closed has 3-1/8” OD, and for this well their maximum opening was limited to 4.1” (tubing ID 4.126”).
The WR-SCSSV depth was achieved, this was clearly confirmed on surface by current draw down and milling response.
Safety valve and LMMV were changed as planned.
Operator praised success and professionalism of the crew and support received.
The expandable bit was the key to opening up a path through the scale to allow us to pull the safety valve. Just so you know the new valve is installed & tested. It has taken us 3 years to get to this point with numerous unsuccessful interventions, the alternative was coiled tubing or possibly a workover. Needless to say there are a few happy faces in here.
The Well Miller® with Expandable Bit for hardware milling provides operators with a better way to repair wells with mechanical obstacles. It can pass through small ID and expand to a larger OD when activated.
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.
Welltec Release Device® (WRD®) is a simple tool which adds versatility and risk reduction to the operation. It provides predetermined locations in the toolstring where it can be parted, should it become stuck.