Pressure-Maintained Gas Hydrate Core Testing for On-Site Analysis
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Solution Overview
Problem
Existing experimental simulation devices for natural gas hydrate struggle with sample transfer under pressure maintenance conditions, integration of sample transfer and testing, miniaturized design for quickness and portability, and high-precision measurement and control under harsh environmental conditions.
Innovation Solution
A device comprising a servo transmission mechanism, pressure-resistant manipulator, sealing mechanism, data acquisition system, resistivity testing system, and undisturbed permeability testing module, which enables real-time monitoring and detection of pressure, temperature, and resistivity, and miniaturized design for on-site gas hydrate analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sample transfer operation is performed under pressure maintenance conditions, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independent modules including a sampling module, a testing module, and a data acquisition module. Each module performs a specific function, allowing the system to maintain pressure conditions during sample transfer while keeping each component relatively simple and manageable.
Solution Approach 2:
A pressure maintenance mechanism acts as an intermediary between the sampling environment and the testing equipment, ensuring that pressure conditions are preserved during sample transfer without requiring the entire system to be overly complex. The pressure maintenance mechanism mediates the transfer process while keeping pressure constant.
2Productivity
If miniaturized design is implemented for on-site analysis, then productivity is improved, but measurement precision may deteriorate
Solution Approach 1:
The device employs a nested structure where smaller components are integrated within larger ones. The sampling needle, testing chamber, and sensors are arranged in a compact nested configuration, reducing the overall device size for portability while maintaining the functional integrity and measurement precision of each component.
Solution Approach 2:
The device utilizes thin-walled pressure maintenance chambers and flexible sealing structures that allow for miniaturization without compromising the ability to maintain pressure conditions. These thin-film structures enable compact design while preserving the necessary pressure environment for accurate measurement.
3Loss of time
If integration of sample transfer and testing is achieved, then loss of time is reduced, but device complexity increases
Solution Approach 1:
The sampling function and testing function are merged into a single integrated device. The sample transfer mechanism is directly connected to the testing chamber, allowing the sample to be transferred and tested in one continuous operation without requiring separate equipment, thereby reducing time loss while keeping the overall system design relatively simple.
Solution Approach 2:
The device is pre-configured with the testing chamber and sensors in position before sample arrival. The pressure maintenance mechanism is pre-established, so when the sample is transferred, all testing conditions are already ready, eliminating setup time and enabling immediate measurement without adding operational complexity.
4Measurement precision
If high-precision measurement and control are implemented under harsh environmental conditions, then measurement precision is improved, but reliability may deteriorate
Solution Approach 1:
The device creates a controlled pressure maintenance environment that acts as an inert atmosphere, isolating the sensitive measurement components from the harsh external conditions. This controlled environment protects the sensors and testing mechanisms while allowing high-precision measurements to be taken without compromising reliability.
Solution Approach 2:
The device incorporates self-diagnostic and self-regulation mechanisms that automatically monitor and adjust operating parameters. The pressure maintenance system automatically compensates for fluctuations, and the data acquisition system automatically validates measurements, ensuring reliable operation under harsh conditions without requiring external intervention.
Data Source
AI summary
A device for characterizing and testing on-site basic parameter of a natural gas hydrate includes a servo transmission mechanism, a pressure-resistant manipulator, a sealing mechanism, a data acquisition system, a resistivity testing system, an outlet metering system and an undisturbed permeability testing module; the undisturbed permeability testing module is used for testing a permeability of a hydrate sample subjected to sample transfer; the pressurizing system is used for adjusting a pressure of each point in the device; the servo transmission mechanism includes a pressure-resistant sample transfer manipulator and a servo driver; the servo driver is used for driving the pressure-resistant sample transfer manipulator to reciprocating motion, and the pressure-resistant sample transfer manipulator is used for separating the sample to be tested from the sheath under a pressure and pushing the sample into a holder; and the resistivity testing system is used for detecting a resistivity value.