Landing in Carbonates - Challenges and Experiences in Brazil

Planning the most efficient trajectory in horizontal section requires landing the well at the right inclination and location with respect to the reservoir structure. In heterogeneous and faulted carbonate reservoir, landing is significantly improved with the use of a Deep Directional Resistivity mapping LWD tool. Examples from landing in offshore Brazil successfully demonstrate the value of such a measurement to improve the correlation while drilling of key formation markets with respect to seismic features and to delineate and detect intrinsic bedding previously unknown from the seismic data. Deeper depth of investigation provide a significant improvement in the landing process in carbonate environments by reducing the seismic uncertainty and understanding the reservoir structure better and on a larger scale while at the same time offers the opportunity to avoid drilling a costly pilot well.