Rotation Sensor Torque Noise Attenuation in Seismic Streamers
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Solution Overview
Problem
Seismic data acquisition in marine environments is hindered by noise contamination, particularly torque noise, which affects the accuracy of particle motion measurements due to cable twisting and eccentric positioning of sensors, leading to signal degradation and reduced ability to detect hydrocarbon deposits.
Innovation Solution
A system utilizing a rotation sensor to estimate and attenuate torque noise from particle motion measurements by processing data from both sensors, employing adaptive noise cancellation techniques and transfer function estimation to isolate and subtract noise components, thereby improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a particle motion sensor is used to measure seismic waves, then measurement capability is improved, but torque noise from cable twisting and eccentric positioning degrades the measurement precision
Solution Approach 1:
A rotation sensor is introduced as an intermediary device to measure the torque noise caused by cable twisting and eccentric positioning. The rotation sensor's measurement serves as a reference signal that is processed through adaptive filtering to estimate and remove the torque noise component from the particle motion sensor's measurement, thereby improving the overall measurement precision
Solution Approach 2:
The system employs adaptive noise cancellation that uses the rotation sensor's measurement as feedback to continuously estimate and subtract the torque noise from the particle motion measurement. This feedback mechanism allows the system to dynamically adjust and remove the harmful torque noise component, improving measurement accuracy
2Measurement precision
If adaptive noise cancellation is applied to remove torque noise, then measurement precision is improved, but device complexity increases due to additional rotation sensor and processing requirements
Solution Approach 1:
The rotation sensor serves multiple functions: it measures the orientation of the streamer, detects torque noise from cable twisting, and provides a reference signal for adaptive noise cancellation. By making the rotation sensor multi-functional, the system improves measurement precision without proportionally increasing device complexity
3Device complexity
If sensors are positioned eccentrically in the streamer, then device complexity is reduced, but torque noise increases affecting measurement reliability
Solution Approach 1:
The system converts the harmful effect of eccentric sensor positioning into a useful measurement opportunity. The rotation sensor measures the torque noise generated by eccentric positioning and cable twisting, and this measurement is then used through adaptive filtering to remove the noise from the particle motion measurement, thereby maintaining reliability despite the simplified eccentric positioning
Data Source
AI summary
A technique includes receiving data indicative of a first measurement acquired by a rotation sensor on a seismic streamer and based on the first measurement, estimating a torque noise present in a measurement acquired by a second sensor on the streamer. The technique includes attenuating the torque noise based on the estimate.