| Patent application number | Description | Published |
|---|
| 20090140723 | Method and apparatus for reducing induction noise in measurements made with a towed electromagnetic survey system - A method for reducing motion induced voltage in marine electromagnetic measurements includes measuring an electromagnetic field parameter at least one position along a sensor cable towed through a body of water. Motion of the sensor cable is measured at least one position along the cable; Voltage induced in the cable is estimated from the motion measurements. The measured electromagnetic field parameter is corrected using the estimated voltages. | 06-04-2009 |
| 20090140741 | Receiver streamer system and method for marine electromagnetic surveying - A receiver streamer system for marine electromagnetic surveying includes a first streamer, and a second streamer disposed substantially parallel to and spaced apart from the first streamer. A first pair of electrodes is associated with the first streamer and a second pair of electrodes is associated with the second streamer. Each of the first and second pairs of electrodes is functionally associated with a voltage measuring circuit configured to measure voltage along an inline direction. At least one electrode on each of the first and second streamers is configured and associated with a voltage measuring circuit to make voltage measurements in a cross-line direction. | 06-04-2009 |
| 20100231224 | Method and system for calibrating streamer electrodes in a marine electromagnetic survey system - A marine electromagnetic sensor system includes a sensor cable having at least one electromagnetic sensor thereon. A first calibration electrode is disposed on the cable on one side of the sensor. A second calibration electrode is disposed on the cable on an opposite side of the sensor. A calibration power supply is coupled to the first and second calibration electrodes. A measuring circuit is coupled to the sensor. A method for calibrating marine electromagnetic survey electrodes includes imparting electric current between calibration electrodes disposed at spaced apart locations on a cable deployed in the water. Voltages impressed across a pair of electrodes disposed on the cable between the calibration electrodes are detected in response to the current. A change in sensitivity of the at least one pair of electrodes is determined using the detected voltages. | 09-16-2010 |
| 20110182138 | Method and system for streamer depth control - A depth and level control system for a geophysical streamer according to one aspect of the invention includes a plurality of tilt sensors disposed at spaced apart locations along the streamer. The tilt sensors each have a first tilt sensing element arranged to measure tilt of the streamer along a longitudinal dimension thereof. A controller is in signal communication with each tilt sensor. A depth control device is in signal communication with each controller. The controller is programmed to operate the depth control device to cause the streamer to be level as measured by the tilt sensor. | 07-28-2011 |
| 20110205839 | Method for towing marine sensor streamers - A method for operating a geophysical sensor streamer in body of water includes operating a remotely operated vehicle coupled to a forward end of the streamer to tow the streamer in the water. Signals generate by sensors on the streamer are communicated substantially in real time to a recording unit on a survey vessel using at least one of electrical and optical cables in an umbilical cable connecting the remotely operable vehicle to the survey vessel. | 08-25-2011 |
| 20110210741 | Structure for magnetic field sensor for marine geophysical sensor streamer - A marine electromagnetic sensor cable includes a first jacket covering an exterior of the cable. At least one wire loop is disposed on the exterior of the first jacket. The wire loop is shaped to have a magnetic dipole moment along a selected direction. A contact ring is disposed inside the first jacket to make electrical connection between the at least one wire loop and an associated signal processing circuit disposed inside the first jacket. | 09-01-2011 |
| 20110242940 | Noise suppression by adaptive speed regulation of towed marine geophysical streamer - A method for towing marine geophysical sensor streamers in a body of water includes moving a towing vessel at a selected speed along the surface of the body of water. At least one geophysical sensor streamer is towed by the vessel at a selected depth in the water. A velocity of the streamer in the water is measured at at least one position along the streamer. The selected speed of the towing vessel is adjusted if the measured velocity exceeds a selected threshold. | 10-06-2011 |
| 20110248718 | Marine sensor streamer having pressure activated stiffness enhancement - A marine sensor streamer includes a jacket covering an exterior of the streamer. At least one strength member extends the length of the jacket. At least one stiffener element extends inside the length of the jacket. The at least one stiffener element includes a gas filling the interior of a flexible, compressible tube and filler elements disposed in the gas. The filler elements have exterior shape and surface roughness such that upon compression of the gas, the filler elements are urged into contact with each other, causing the streamer to become substantially rigid. | 10-13-2011 |
