Geological monitoring for drilling a transport section well bore using inverse values of ROP

Summary At the stage of geological monitoring for drilling the transport section of the well, the geosteering specialist uses LWD and Mudlogging data. Geophysical methods of gamma-ray, neutron gamma-ray, and laterolog are used for stratigraphic identification of the target formation. If the task is to stop the drilling of the transport section at a depth of half а meter from the top of the formation, then an at-bit sensor gamma-ray is required. However, this tool has a high cost and is not always used in the bottomhole assembly. So, if a constant drilling regime is observed and the angle of the bit meeting with the rock stratification plane is minimal, it is legitimate to use the value-inverted ROP (ROPIV) curve from the Mudlogging station to identify the stratigraphic reference point of the target carbonate formation.