Azimuthal geosteering technique

Today geosteering mostly focused at 2D models along planned borehole azimuth. This approach allows to adjust trajectory by changing the inclination based on comparing synthetic and real-time logs and interpretation of images and boundary detection tools. However, there are cases which required drilling at single TVDSS, but there are remained structural uncertainties. Consequently, it is required to perform geosteering to keep the wellbore inside the target formation, for example while drilling the laterals in oil rims at the edge of structures with steep formation dips. In such cases trajectory azimuth adjustments needed for changing stratigraphical position of the borehole. Conventional geosteering approach doesn’t provide accurate decisions assessment and new techniques are required. Abstract describes an approach of azimuthal trajectory adjustments for well placement. Different methods of azimuthal steering reviewed in this paper in dependence on formation strike and dip. Provided calculations could be utilized for quick decision-making process while geosteering. Additional data of LWD images and boundaries detection tools evaluated in respect to azimuth adjustment technique and efficiency of its applications.