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US 7,599,249 B2Granted
Cable motion detection
AssigneeWesternGeco L.L.C.
InventorsKenneth E. Welker, Nicolas Goujon
Life of this patent
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Abstract
The present invention provides for cable motion detection. In one aspect of the instant invention, a method is provided for cable motion detection using orientation sensor. The method includes determining at least one initial inclination of at least one orientation sensor coupled to a seismic cable, determining at least one current inclination of the at least one orientation sensor, and determining whether the at least one seismic cable has moved from the at least one initial inclination and the at least one current inclination.
Claims12
A method, comprising:
- determining at least one initial value of a DC signal of at least one orientation sensor coupled to at least one ocean bottom cable;
- determining at least one current value of a DC signal of the at least one orientation sensor;
- comparing the at least one initial value of the DC signal of the at least one orientation sensor to the at least one current value of the DC signal of the at least one orientation sensor;
- determining whether the at least one ocean bottom cable has moved more than an acceptable distance from an initial position based on the comparison;
- and
- if it is determined that the at least one ocean bottom cable has moved more than the acceptable distance, then repositioning the at least one ocean bottom cable to a desired position.
3 more elements
A system for carrying out a seismic survey, comprising:
- at least one ocean bottom cable;
- at least one seismic sensor coupled to the at least one ocean bottom cable;
- at least one orientation sensor coupled to the at least one ocean bottom cable;
- and
- a signal processing unit capable of:
- determining at least one initial value of a DC signal of the at least one orientation sensor;
- determining at least one current value of a DC signal of the at least one orientation sensor;
- comparing the at least one initial value of the DC signal of the at least one orientation sensor to the at least one current value of the DC signal of the at least one orientation sensor;
- determining an AC signal in response to a change in the orientation or inclination of the at least one orientation sensor;
- and
- determining whether the at least one ocean bottom cable has moved based on the comparison and the AC signal.
8 more elements
A system for carrying out a seismic survey, comprising:
- at least one ocean bottom cable;
- at least one seismic sensor coupled to the at least one ocean bottom cable;
- at least one orientation sensor coupled to the at least one ocean bottom cable, wherein the at least one orientation sensor is at least one of a single and a dual axis accelerometer formed on an integrated circuit chip;
- and
- a signal processing unit capable of:
- determining at least one initial inclination of the at least one orientation sensor;
- determining at least one current inclination of the at least one orientation sensor;
- determining whether the at least one ocean bottom cable has moved more than an acceptable distance using the at least one initial inclination and the at least one current inclination;
- and
- if it is determined that the at least one ocean bottom cable has not moved more than the acceptable distance, then performing a seismic shooting operation.
7 more elements
An article comprising one or more machine-readable storage media containing instructions that when executed enable a processor to:
- determine at least one initial value of a DC signal of at least one orientation sensor coupled to at least one ocean bottom cable when the at least one ocean bottom cable is at rest;
- determine an AC signal in response to a change in the orientation or inclination of the at least one ocean bottom cable;
- determine at least one current value of a DC signal of the at least one orientation sensor when the at least one ocean bottom cable is at rest;
- compare the at least one initial value of the DC signal of the at least one orientation sensor to the at least one current value of the DC signal of the at least one orientation sensor;
- and
- determine whether the at least one ocean bottom cable has moved based on the comparison and the AC signal.
3 more elements
An apparatus, comprising:
- means for determining at least one initial value of a DC signal of at least one orientation sensor coupled to at least one ocean bottom cable;
- means for determining at least one current value of a DC signal of the at least one orientation sensor;
- means for comparing the at least one initial value of the DC signal of the at least one orientation sensor to the at least one current value of the DC signal of the at least one orientation sensor;
- means for determining whether the at least one ocean bottom cable has moved based on the comparisons;
- means for repositioning the at least one ocean bottom cable to a desired position if it is determined that the at least one ocean bottom cable has moved;
- and
- means for performing a seismic shooting operation if it is determined that the at least one ocean bottom cable has not moved.
4 more elements
Dependencies are inferred from the claim text.