Abstract
Horizontal well landing in block 7 presents several challenges including reservoir vertical position uncertainty, which is generally anticipated based on seismic models, local formation dip at wellbore position and well path construction following strict directional objectives.
To support landing decisions, a logging-while-drilling (LWD) technology based on deep azimuthal electromagnetic measurements was introduced in the project, not only for conventional well-to-well correlation, but to remotely detect the approaching of the latest geological markers and adjust the trajectory inclination and landing point accordingly. In addition, a real-time gamma-ray borehole image was used to qualitatively identify local formation dip for a more effective planning of the further lateral section. Landing section has also been optimized with the use of a point-the-bit rotary steerable system (RSS), which allowed improved directional control, safer operation and higher build rates, minimizing the need of an additional mud motor run to achieve navigation inclination.
This paper presents case studies of the implementation of well placement and directional technologies to optimize horizontal well landing, and the introduction of a novel deep directional resistivity system to eliminate the need of of drilling a pilot hole.
