Seismic cable and acoustically decoupled sensor
AssigneeWesternGeco L.L.C.
InventorsLars Borgen, Geir Holm, Ivar Andreas Valstad, Kambiz Iranpour
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Abstract
A robust seismic cable and sensor module system wherein the sensor modules include a housing and sensing unit. The housing substantially transfers the load and torque of the cable from one end of the housing to the other bypassing the sensing unit and the sensing unit and housing are acoustically decoupled from each other for the seismic frequencies desired.
Claims18
A seismic cable having seismic sensors that are substantially acoustically decoupled from the cable, the cable comprising:
- a seismic cable;
- a perforated housing having a first end and a second end, the ends fixedly connected to the cable;
- and
- a sensor unit including a sensor rigidly connected to an acoustic connector, the sensor disposed within an interior of the housing and the acoustic connector extending through an aperture to the exterior of the housing to acoustically couple the sensor to the earth's surface, whereby the sensor is substantially acoustically decoupled from the earth's surface through the cable irrespective of whether the cable is in tension.
A seismic cable having seismic sensors that are substantially acoustically decoupled from the cable, the cable comprising:
- a perforated housing having a first end and a second end, the ends fixedly connected to the cable to transfer tension in the cable from one end of the housing to the other;
- a sensor unit positioned in the interior of the of the housing;
- an acoustic connector rigidly connected to the sensor unit, the acoustic connector projecting outward from the sensor unit and extending through an aperture to the exterior of the housing;
- and
- means for suspending the sensor unit relative to the housing to dampen the transfer of vibrations from the housing to the sensor unit, whereby the sensor unit is substantially acoustically decoupled from the earth through the housing and the sensor unit is substantially decoupled from the earth through the cable irrespective of whether the cable is in tension.
A seismic cable having sensor modules, the sensor module comprising:
- a housing having a first end connected to the cable at a first termination and a second end connected to the cable at a second termination wherein the load and torque of the cable is transferred from the first end to the second end;
- a sensor unit including a sensor rigidly connected to an acoustic connector, the sensor disposed in an interior of the housing and the acoustic connector extending through an aperture to the exterior of the housing to acoustically couple the sensor to the earth, whereby the sensor unit is substantially acoustically decoupled from the earth through the housing.
Dependencies are inferred from the claim text.