System and method for stick-slip correction
AssigneeBaker Hughes Incorporated
InventorAndreas Hartmann
Life of this patent
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Abstract
A method of processing downhole measurement data includes: receiving formation measurement data generated by a downhole tool during a logging-while drilling operation over a selected time period; receiving a measured depth corresponding to the selected time period based on data taken at a surface location; receiving tool rotation data generated by measurements of a rotational rate of the downhole tool taken by a downhole sensor during the selected time period; calculating a new depth of the tool as a function of time over the selected time period based on a relationship between the tool rotation data and the measured depth; and correcting an original depth of the measurement data with the new depth.
Claims20
A method of processing downhole measurement data, the method comprising:
- receiving formation measurement data generated by a downhole tool during a logging-while drilling operation over a selected time period;
- receiving a measured depth corresponding to the selected time period based on data taken at a surface location;
- receiving tool rotation data generated by measurements of a rotational rate of the downhole tool taken by a downhole sensor during the selected time period, the tool rotation data taken independent of the formation measurement data;
- computing a rate of penetration (ROP) profile based on a mathematical relationship between the rotational rate and ROP;
- generating a depth profile based on the ROP profile, the depth profile indicating depth as a function of time;
- calculating a new depth of the tool as a function of time over the selected time period based on the depth profile;
- and
- correcting an original depth of the formation measurement data with the new depth.
A system for imaging a formation surrounding a wellbore during a drilling operation, the system comprising:
- a drill string comprising a downhole tool for collecting formation measurement data and a downhole sensor configured to measure a rotational rate of the downhole tool;
- and
- a processor configured to receive the formation measurement data, receive tool rotation data generated from the downhole sensor and receive measured depth data taken at a surface location, the tool rotation data taken independent of the formation measurement data, the processor configured to perform:
- computing a rate of penetration (ROP) profile based on a mathematical relationship between the rotational rate and ROP;
- generating a depth profile based on the ROP profile, the depth profile indicating depth as a function of time;
- calculating a new depth of the tool as a function of time over the selected time period based on the depth profile;
- and
- correcting an original depth of the formation measurement data with the new depth.
A computer program product for processing downhole measurement data, the computer program product including a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
- receiving formation measurement data generated by a downhole tool during a logging-while drilling operation over a selected time period;
- receiving a measured depth corresponding to the selected time period based on data taken at a surface location;
- receiving tool rotation data generated by measurements of a rotational rate of the downhole tool taken by a downhole sensor during the selected time period, the tool rotation data taken independent of the formation measurement data;
- computing a rate of penetration (ROP) profile based on a mathematical relationship between the rotational rate and ROP;
- generating a depth profile based on the ROP profile, the depth profile indicating depth as a function of time;
- calculating a new depth of the tool as a function of time over the selected time period based on the depth profile;
- and
- correcting an original depth of the formation measurement data with the new depth.
Dependencies are inferred from the claim text.