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Geological monitoring for drilling a transport section well bore using inverse values of ROP
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE GeoTech 2021 First EAGE Workshop on Directional Drilling and Geosteering, Mar 2021, Volume 2021, p.1 - 5
Abstract
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.