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A visual large-scale thermal-fluid-solid coupling gas hydrate extraction experiment simulation device and method for telescopic wells

An experimental simulation, hydrate technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as long-term production efficiency, large heat loss, icing, etc., and achieve reliable results in commercial production.

Active Publication Date: 2022-07-08
DALIAN UNIV OF TECH
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Problems solved by technology

The depressurization method is the most economical, effective and simple mining method. The main disadvantage is that the latent heat of hydrate decomposition phase change causes a local temperature drop, which may cause the secondary formation or freezing of hydrate, which affects the long-term mining efficiency; the disadvantage of the heating method It is not only to provide heat for hydrate decomposition and phase transition, but also to heat sediments, pore gases and liquids. The heat loss is large, the efficiency is low, and the cost is high

Method used

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  • A visual large-scale thermal-fluid-solid coupling gas hydrate extraction experiment simulation device and method for telescopic wells
  • A visual large-scale thermal-fluid-solid coupling gas hydrate extraction experiment simulation device and method for telescopic wells
  • A visual large-scale thermal-fluid-solid coupling gas hydrate extraction experiment simulation device and method for telescopic wells

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Embodiment Construction

[0023] The specific embodiments of the present invention are further described below with reference to the technical solutions and the accompanying drawings.

[0024] like figure 1 As shown, connect according to the device structure, and use the cover device to carry out the three-well combined method gas hydrate exploitation experiment;

[0025] (1) Check: all valves and pumps are closed to ensure that all devices and pipelines do not leak water or air;

[0026] (2) Generation of natural gas hydrate: Gas saturation generation is used to simulate the generation of natural gas hydrate in the real situation; the volume of glass sand is the volume in the reactor minus the volume of the production well 5 and the high-precision multi-position temperature sensor 6, and then the Calculate the quality of the sand from the density of the sand, and fill the sand into the reactor 4 evenly and tightly; the heat injection well 5-3 is of the type shown in Figure 2(a), and a 100 ohm resista...

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Abstract

The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a large-scale telescopic well thermal-fluid-solid coupling experimental simulation device and method for natural gas hydrate exploitation. The thermal-fluid-structure coupled gas hydrate mining experimental simulation device for telescopic wells includes five parts: large-scale hydrate reaction system, flow injection system, three-well thermal-fluid-structure coupled mining collection system, micro-visualization system and data detection and acquisition system. The three mining methods of depressurization mining method, heat injection mining method and water flow erosion method in different modes can be flexibly combined to simulate the actual mining process, and provide a thermal-fluid-solid coupling natural gas hydrate mining method and device for telescopic wells. It is used to explore the mining characteristics when different mining methods are combined. It provides reliable experimental basis and theoretical analysis for realizing efficient and continuous commercial exploitation of hydrate.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a large-scale telescopic well thermal-fluid-solid coupling experimental simulation device and method for natural gas hydrate exploitation. Background technique [0002] Gas hydrate is an ice-like solid compound formed by natural gas (the main component methane) and water under high pressure and low temperature conditions. As an alternative new energy, natural gas hydrate has high energy density, large reserves, huge resource potential and broad development prospects. With the increasing demand for natural gas in my country, the research on its exploitation is particularly urgent. Gas hydrate is a metastable mineral. Once the occurrence conditions change, the phase balance of gas hydrate reservoir will be destroyed, resulting in the decomposition of gas hydrate. The traditional natural gas hydrate extraction technology is designed according to this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B43/01E21B43/16E21B43/20E21B43/24
CPCE21B49/00E21B43/01E21B43/168E21B43/20E21B43/24
Inventor 宋永臣杨明军赵国钧陈兵兵刘瑜蒋兰兰
Owner DALIAN UNIV OF TECH
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