Patent ID: 11920467
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 12:
13. A computer-implemented system, comprising:
one or more processors; and
a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, the programming instructions instructing the one or more processors to perform operations comprising:
measuring, in real time, rock properties at a drill bit during drilling of a well;
receiving, in response to the measuring, drilling acoustic signals generated during the drilling of the well, wherein the drilling acoustic signals correspond to a time domain;
performing, using the drilling acoustic signals, a fast Fourier transformation (FFT) to generate FFT data;
generating normalized FFT data by normalizing the FFT data using normalization parameters corresponding to a drill string rotation rate record of a drill string used during drilling of the well, wherein the drill string rotation rate record of the drill string is received during drilling of the well;
determining normalized apparent power from data points of a predetermined top percentage of the normalized FFT data within a lithological significant frequency range, wherein the normalized apparent power measures a power of the drilling acoustic signals and is a function of an amplitude and frequency of the normalized FFT data, and wherein the lithological significant frequency range is a frequency range within which drill sounds are related with lithology of rock formations in the well;
providing a display of the normalized apparent power against the drill string rotation rate record, wherein the display includes one or both of the normalization parameters used in determining the normalized apparent power and drilling parameters used during the drilling of the well;
receiving user selections from the display of one or both of the normalization parameters and the drilling parameters;
updating, based at least on the user selections, one or more of the normalization parameters used in determining the normalized apparent power and the drilling parameters used during the drilling of the well;
measuring, in real time, the rock properties at the drill bit; and
applying, in real time using at least the rock properties and the lithology of the rock formations in the well, the updated drilling parameters to drilling operations, including performing, based on lithology boundaries, geo-steering of the drill bit during the drilling operations.