This paper is a review of a 2D Rotary Steerable System as used to control the inclination of over 200 horizontal wells. Horizontal well drilling is a common directional drilling technique enabling access to hydrocarbon reserves whilst lowering field development costs and improving well production. In order to maximise drilling in the "filet mignon" of the reservoir, geologists often require tight TVD corridors to be maintained. To achieve this, TVD corrections can be made in either rotary or oriented mode. Both methods are evaluated in terms of their effectiveness and efficiency. Factors in favour of a 2D Rotary Steerable System are: it is reliable, proven and adds significant value to the drilling process. It is effective because it enables tight TVD objectives to be met. It is efficient because it increases Rates of Penetration (ROP) whilst improving well-bore quality. These benefits are direct consequences of eliminating oriented inclination control, the smoothing out of well-bore curvature (dogleg severity) and the continuous mechanical agitation of cuttings beds. Considerable offset data (Ref 1 to 7 inc) shows how directional drillers have used rotary BHA’s to meet tight TVD objectives; much to the satisfaction of Geologists.

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