CO2 Replacement Test System for Natural Gas Hydrate Simulation
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Solution Overview
Problem
There is a lack of quantitative evaluation and experimental simulation equipment for the efficiency and process of replacing natural gas hydrates with carbon dioxide, making it difficult to understand the influencing factors of this replacement method for exploiting natural gas hydrates.
Innovation Solution
A test system and method are developed, comprising a sample reaction vessel, gas supply devices, and data acquisition control systems to simulate the replacement of natural gas hydrates with carbon dioxide, allowing for controlled temperature and pressure conditions and monitoring of gas composition and pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon dioxide replacement method is used for natural gas hydrate exploitation, then more stable carbon dioxide hydrates can be produced and resource sustainability is improved, but there is lack of quantitative evaluation and experimental simulation equipment making it difficult to understand the replacement process
Solution Approach 1:
The patent creates a laboratory-scale test system that copies and simulates the actual carbon dioxide replacement process in natural gas hydrate reservoirs. The test system includes a reaction vessel, gas supply devices, temperature and pressure control systems, and data acquisition equipment that replicates the complex geological conditions and replacement mechanisms, enabling quantitative evaluation without requiring actual field experimentation.
2Measurement precision
If laboratory test system is constructed for simulating carbon dioxide replacement, then quantitative evaluation of replacement efficiency and process can be achieved, but system complexity and device requirements increase
Solution Approach 1:
The test system is divided into multiple independent functional modules: a reaction vessel for hydrate formation and replacement, gas supply devices for methane and carbon dioxide, temperature control system, pressure control system, and data acquisition system. Each module can be independently controlled and optimized, reducing overall system complexity while enabling precise measurement of replacement efficiency through coordinated operation of these segmented components.
Solution Approach 2:
The test system is designed with multi-functional components that can perform multiple operations. For example, the reaction vessel serves both as the reaction chamber and as a pressure vessel; the gas supply devices can supply different gases (methane, carbon dioxide, nitrogen) for different experimental stages; the data acquisition system monitors multiple parameters (pressure, temperature, gas flow) simultaneously. This universality reduces the number of separate devices needed while maintaining measurement precision.
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
This system enables accurate control of pressure and temperature conditions for methane hydrate synthesis and carbon dioxide replacement, ensuring the sustainability of the replacement process and providing insights into the efficiency and factors influencing the replacement of natural gas hydrates with carbon dioxide.
Implementation Method 1
sleeved with a liquid cooling jacket
Implementation Method 2
The sample boundary condition loading device comprises an axial pressure loading device and a confining pressure loading device
Implementation Method 3
the phase development curves of the methane hydrate and the carbon dioxide hydrate can form an intersection point. As hydrate decomposition is a heat absorption process, carbon dioxide hydrate is more stable in the temperature and pressure range below the intersection point
Data Source
AI summary
A test system and a test method for replacing natural gas hydrate with carbon dioxide are disclosed, relating to the technical field of exploitation of natural gas hydrates. The test system comprises a sample reaction vessel, a sample boundary condition loading device, a methane gas supply device, a carbon dioxide gas supply device, an output article collection and measurement device, and a data acquisition control device. A sample-sealing rubber sleeve and an upper sample-sealing plate are arranged in an inner cavity of the vessel, the sample-sealing rubber sleeve, a lower tray and the upper sample-sealing plate form a sample-sealing space. An axial pressure loading plate is arranged on the upper sample-sealing plate, and an upper cover plate is provided with an axial pressure loading injection hole. A side shrouding is provided with a confining pressure loading injection hole and a product discharge hole.