Seismic Node Deployment with Dynamic Buoyancy Control
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Solution Overview
Problem
Current seismic data acquisition methods face limitations in deployment speed and positioning accuracy, particularly in deep water, due to the use of steel armor-based cables and lightweight carrier lines, which are depth-limited and prone to reliability issues, and lack efficient S-wave detection.
Innovation Solution
A sub-sea deployment system that includes a deployment apparatus towed behind a seismic vessel, utilizing a carrier line with controlled tension and drag properties, and a deployment apparatus with active ballasting and hydrodynamic shaping to stabilize and accurately position seismic nodes on the ocean floor, enabling faster and more precise deployment of seismic nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If steel armor-based cables are used for deep water deployment, then deployment accuracy is improved, but deployment speed decreases and reliability deteriorates due to tensile strength limitations
Solution Approach 1:
The patent changes the physical parameters of the carrier line by using a multi-component buoyancy system with adjustable buoyancy modules. This allows the carrier line to maintain near-neutral buoyancy throughout the water column, enabling faster deployment speeds without compromising positioning accuracy. The buoyancy characteristics are dynamically adjusted to optimize both speed and accuracy.
Solution Approach 2:
The patent employs a composite carrier line system combining synthetic ropes with controlled buoyancy elements and drag reduction features. This composite structure achieves optimal specific gravity close to seawater, minimizing free-fall velocity while maintaining tensile strength reliability, thereby resolving the contradiction between deployment speed and accuracy.
2Measurement precision
If steel armor-based cables are used for deep water deployment, then deployment accuracy is improved, but system reliability deteriorates due to complexity of power and telemetry requirements
Solution Approach 1:
The patent extracts and eliminates the heavy steel armor and associated power telemetry infrastructure from the carrier line system. By using autonomous seismic nodes with onboard power and memory, the system removes the complex electrical conductors and telemetry equipment that compromised reliability, while maintaining deployment accuracy through buoyancy-controlled positioning.
Solution Approach 2:
The seismic nodes are designed as autonomous units with integrated power sources, memory, and processing capabilities. Each node independently records and stores seismic data without requiring continuous power or telemetry support from the carrier line, thereby eliminating the reliability issues associated with complex power and telemetry systems while maintaining precise deployment positioning.
3Length of stationary object
If lightweight carrier lines with specific gravity close to seawater are used, then depth limitation is reduced, but deployment speed decreases due to minimal free fall velocity
Solution Approach 1:
The patent implements dynamic buoyancy control along the carrier line, with buoyancy modules that can be actively adjusted during deployment. This dynamic system allows the carrier line to achieve optimal descent velocity at different depths, maintaining fast deployment speed while reaching greater depths. The buoyancy characteristics change dynamically to balance speed and depth requirements.
Solution Approach 2:
The patent modifies the physical parameters of the carrier line by incorporating drag reduction features and adjustable buoyancy elements. These parameter changes enable the system to achieve controlled descent rates that are faster than traditional neutral buoyancy systems while still reaching deep water depths, resolving the contradiction between depth capability and deployment speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly increases deployment speed and accuracy, overcoming the limitations of traditional methods by maintaining constant tension and minimizing stress on the carrier line, thus improving operational efficiency and data quality.
Implementation Method 1
deployment apparatus with active ballasting and hydrodynamic shaping to stabilize and accurately position seismic nodes on the ocean floor
Implementation Method 2
deployment apparatus with active ballasting and hydrodynamic shaping to stabilize and accurately position seismic nodes on the ocean floor
Implementation Method 3
utilizing a carrier line with controlled tension and drag properties
Implementation Method 4
utilizing a carrier line with controlled tension and drag properties
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A seismic deployment system having a deployment apparatus, a tow line, and a carrier line having a plurality of seismic sensor coupled therealong. The deployment apparatus has a hydrodynamic body. The tow line is configured for towing the hydrodynamic body through a water column. The carrier line is engaged with the deployment apparatus. The deployment apparatus is configured to control tension in the carrier line for deployment of the seismic sensors while the hydrodynamic body is towed through the water column by the tow line.