A significant focus of high arctic's has been to use underbalanced technology as a production enhancement service. The 250k ub rig is the third generation to the stand alone snubbing system technology introduced by high arctic in 1997 and was designed with safety in mind. The 250k ub rig was primarily designed to underbalance drill, workover, complete and snub new and existing well bores to a depth of 3,500 meters. The 250k ub rig is primarily a mobile, land-based rig that rigs up faster, trips faster and mobilizes/demobilizes more efficiently than the larger hydraulic workover rigs.
The 250k ub rigs are a specialized "rack and pinion mast-type" rig that can lift 250,000 pounds as a conventional workover rig but also acts as a conventional 125,000-pound snubbing unit. The 250k ub rig is a self-contained unit capable of all underbalanced drilling, milling, workover and snubbing operations that are currently being conducted with the conventional stand alone snubbing systems, but operating at greater depths. This rig has been utilized to efficiently mill out composite bridge plugs in an underbalanced state. The 250k ub rigs utilize plc electronic-over-hydraulic operating systems. The unit has an automated tripping procedure, thus increasing the speed at which the tubulars are safely inserted or removed from the wellbore. With a 24 metre mast, the 250k ub rig allows for a number of bop configurations to be added, while maintaining standard drilling and tripping capabilities. The simple and quick installation of bops not only reduces rig set-up time and its associated costs, but also increases safety for personnel. The 250k ub rigs have a smaller footprint than conventional service rigs allowing operations in tighter locations and reducing land disturbance.
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