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Tuesday, November 29, 2016
Victoria Oil & Gas’ (VOG) subsidiary in Cameroon, Gaz du Cameroun (GDC) reported that following the spud of the La-107 at the start of November, the well has been successfully drilled, cased, and cemented in the uppermost, 18 5/8″ section of the well to a depth of 400 meters.
Operations on La-107 were then suspended as planned and the rig was skidded a distance of 10 meters along the rail system to the La-108 well location. The rig is a rail-mounted drilling rig and can skid between the two wells in a matter of hours. GDC spud the La-108 well on November 12 and it was also drilled and cased to a depth of 400 meters. Currently, Savannah is drilling the 17½” hole section on La-108, after which the rig will be skidded back to the La-107 well to drill its 17½” hole section.
The gas bearing target horizons, from which it is anticipated both new wells will produce, are in the Upper Cretaceous (Campanian and Santonian) Logbaba Formation, which is a thick sequence of interbedded sands and shales found at depths between 1,700 meters and 3,200 meters below the surface.
The 2016/17 drilling campaign at Logbaba is designed as a ‘batch drilling’ operation. As a well is drilled, the equipment, drilling fluids, drilling services and specialist personnel required vary for each hole section. In a batch drilling operation, the rig is moved back and forth between the wells, progressing through all the hole sections until the wells have reached target depth. The Komako 1 rail mounted drilling rig is designed for this type of operation.
Significant cost saving and efficiencies are realized from a batch drilling program, as materials and services are mobilized to the site, employed on both wells for each hole section and then demobilized when no longer required.
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