Apparatus and method for motion correction to sensor measurements
AssigneeHalliburton Energy Services, Inc.
InventorMarian Morys
Life of this patent
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Abstract
A method for correcting a motion related distortion in a sensor measurement comprises establishing a reference position in a borehole. A parameter of interest is measured at a plurality of toolface angles as the tool makes a revolution in the borehole. A distance to a wall of the borehole is measured associated with each parameter of interest measurement. A lateral motion of the tool is measured between each parameter of interest measurement, and a toolface angle of the tool is measured at each parameter of interest measurement. A controller comprising a processor acts according to programmed instructions to calculate a correction to the parameter of interest measurement referenced to the reference position based at least partly on the measured tool motion.
Claims28
An apparatus for correcting a downhole measurement comprising:
- a tool in a bottomhole assembly in a borehole;
- at least one first sensor disposed in the tool to make a plurality of measurements of a parameter of interest during each tool revolution;
- at least one transducer disposed in the tool to measure a distance to a wall of the borehole associated with each parameter of interest measurement;
- at least one second sensor disposed in the tool to measure lateral motion of the tool between each measurement and a toolface angle of the tool at each measurement;
- and
- a controller comprising a processor to calculate a correction to the parameter of interest measurement based at least partly on the measured tool motion.
A method for correcting a motion related distortion in a distance measurement comprising:
- establishing a reference position in a borehole;
- measuring a plurality of substantially radial distances from a tool to a wall in a borehole as the tool makes a revolution in the borehole;
- sensing a motion of the tool in the borehole between each measurement;
- calculating a tool position and a toolface angle corresponding to each of the plurality of distance measurements based on the sensed motion of the tool;
- and
- calculating a corrected distance and corrected toolface angle referenced to the reference position for each of the plurality of radial distance measurements.
A computer readable medium having stored therein instructions, which when executed on a processor, implements a method of correcting a motion related distortion in a distance measurement comprising:
- establishing a reference position in a borehole;
- measuring a plurality of substantially radial distances from a tool to a wall in a borehole as the tool makes a revolution in the borehole;
- sensing a motion of the tool in the borehole between each measurement;
- calculating a tool position and a toolface angle corresponding to each of the plurality of distance measurements based on the sensed motion of the tool;
- and
- calculating a motion corrected distance and toolface angle relative to the reference position for each of the plurality of radial distance measurements.
A method for correcting a motion related distortion in a sensor measurement comprising:
- establishing a reference position in a borehole;
- measuring a parameter of interest at a plurality of toolface angles as the tool makes a revolution in the borehole;
- measuring a distance to a wall of the borehole associated with each parameter of interest measurement;
- measuring lateral motion of the tool between each parameter of interest measurement and a toolface angle of the tool at each parameter of interest measurement;
- and
- a controller comprising a processor acting according to programmed instructions to calculate a correction to the parameter of interest measurement referenced to the reference position based at least partly on the measured tool motion.
Dependencies are inferred from the claim text.