The objective of the workover was to remove the existing 3½” dilution string and 5” production string from the well, perform wireline investigations on the 10¾” casing and recomplete with a new 5” x 4½” drill-in completion and a new 2⅞” dilution string.
The lower section of the old completion, was damaged, restricting efficient production from the well.
The inner completion string was retrieved with a hydraulic workover unit. A floating mud cap was required to control the well, so the dilution and production string could be safely pulled out of the hole, then new drill-in 5” x 4 ½” completion was RIH.
The drill-in completion was equipped with a sacrificial BHA; including a mud motor (PDM) and a directional MWD. The drilling took longer than expected due to difficulties with the MWD. Eventually the new production string was drilled near vertical to TD and the dilution string was successfully run in the hole.
The project was finished with zero HSE related non-conformities.