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GDC begins drilling

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Oilfield Technology,

Gaz du Cameroun S.A. (GDC) has announced that following spudding of well La-107 in November, it has successfully drilled, cased and cemented the uppermost section of the well to a depth of 400 m. Operations on La-107 were then suspended as planned and the rig was skidded a distance of 10 m along the rail system to the La-108 well location. The 1500 HP Komako 1 drilling rig, owned and operated by Savannah Oil Services Cameroon S.A., is a rail-mounted drilling rig and can skid between the two wells in a matter of hours.

Well La-108 was spudded on the 12 November 2016 and has been drilled and cased to a depth of 400 m. Currently, Savannah is drilling the 17.5 in. hole section on La-108.

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 1700 m and 3200 m 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 realised from a batch drilling programme, as materials and services are mobilised to the site, employed on both wells for each hole section and then demobilised when no longer required.

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