Time corrections for drilling data

A set of application program interfaces embodied on a computer readable medium for execution on a processor in conjunction with an application program for applying a time adjustment for a wellbore sensor time series relative to a reference time series comprising:

• a first time series interface that receives a first time series from a wellbore sensor of a drill string during a drilling operation;
• a reference time series interface that receives a reference time series;
• a linear moveout correction interface for determining a linear moveout time correction to apply to the first time series, the linear moveout time correction equal to a depth of the wellbore sensor divided by a signal propagation velocity;
• a linear moveout correction application interface that applies the linear moveout time correction to the first time series;
• a cross-correlation interface that cross-correlates the first time series with the reference time series to determine a cross-correlation time correction to apply to the first time series;
• a cross-correlation time correction interface to apply the cross-correlation time correction to the first time series to obtain a cross-correlation corrected time series;
• and
• an output interface to display the cross-correlation corrected time series during the drilling operation for monitoring and identifying a dysfunction of the drill string during the drilling operation using the cross-correlation corrected time series.

A system for determining a time adjustment for a wellbore sensor time series relative to a reference time series where the system comprises:

• a. a first time series acquired from a sensor of a drill string in a wellbore during a drilling operation;
• b. a reference time series;
• c. a computer comprising a memory and a processor;
• d. a moveout correction computer program module stored in the memory for determining a moveout correction for the first time series, the moveout correction equal to a depth of the sensor associated with the first time series divided by a signal propagation velocity;
• e. a moveout correction application computer program module stored in the memory for applying the moveout correction to the first time series to obtain a moveout corrected time series;
• f. a cross-correlation computer program module stored in the memory for cross-correlating the first time series with the reference time series to determine a cross-correlation correction to apply to the first time series;
• g. a cross-correlation correction application computer program module stored in the memory for applying the cross-correlation correction to the first time series to obtain a cross-correlation corrected time series;
• and
• h. an output interface to display the cross-correlation corrected time series during the drilling operation for monitoring and identifying a dysfunction of the drill string during the drilling operation using the cross-correlation corrected time series.

An apparatus for adjusting a time series from a wellbore sensor relative to a reference time series where the apparatus comprises:

• a. a wellbore sensor associated with a drill string in a wellbore for acquiring a first time series during a drilling operation;
• b. a surface sensor for acquiring a reference time series;
• c. a computer comprising a memory and a processor;
• d. a first computer program module for determining a linear moveout time offset adjustment to apply to the first time series, the linear moveout time offset adjustment equal to a depth divided by a signal propagation velocity;
• e. a second computer program module to apply the linear moveout time offset adjustment to the first time series;
• f. a third computer program module for cross-correlating the first time series with the reference time series to determine a cross-correlation time to apply to the first time series;
• g. a fourth computer program module for applying the cross-correlation time to the first time series to obtain a cross-correlation corrected time series;
• and
• h. an output interface to display the cross-correlation corrected time series during the drilling operation for monitoring and identifying a dysfunction of the drill string during the drilling operation using the cross-correlation corrected time series.