Synthetic Formation Evaluation Logs Based on Drilling Vibrations
AssigneeBaker Hughes Incorporated
InventorJianyong Pei
Life of this patent
Estimating the term…
Abstract
A method and apparatus for predicting a formation parameter at a drill bit drilling a formation is disclosed. A vibration measurement is obtained at each of a plurality of depths in the borehole. A formation parameter is obtained proximate each of the plurality of depths in the borehole. A relationship is determined between the obtained vibration measurements and the measured formation parameters at the plurality of depths. A vibration measurement at a new drill bit location is obtained and the formation parameter at the new drill bit location is predicted from the vibration measurement and the determined relation. Formation type can be determined at the new drill bit location from the new vibration measurement and the determined relationship.
Claims18
A method of predicting a formation parameter at a drill bit drilling a formation, comprising:
- obtaining a vibration measurement at a plurality of depths in the borehole;
- measuring a formation parameter at the plurality of depths in the borehole;
- determining a relation between the obtained vibration measurements and the measured formation parameters at the plurality of depths;
- obtaining a vibration measurement at a drill bit location;
- and
- predicting the formation parameter at the drill bit location using the vibration measurement and the determined relation.
A method of determining a formation type at a drill bit drilling a formation, comprising:
- obtaining drill bit vibration measurements and formation parameter measurements at a plurality of depths in a borehole;
- selecting a subset of the vibration measurements based on formation parameter measurements;
- determining a trend of the selected vibration measurements with depth to form a vibration shale baseline;
- obtaining a vibration measurement at a drill bit location;
- and
- predicting the formation type at the drill bit location by comparing the vibration measurement and the determined vibration shale baseline.
A computer-readable medium having instruction stored therein that when accessed by a processor enable the processor to perform a method, the method comprising:
- receiving vibration measurements obtained at a plurality of depths in the borehole;
- receiving formation parameter measurements obtained at the plurality of depths in the borehole;
- determining a relation between the vibration measurements and the formation parameters at the plurality of depths;
- receiving a vibration measurement obtained at a drill bit location;
- and
- predicting the formation parameter at the drill bit location using the vibration measurement and the determined relation.
Dependencies are inferred from the claim text.