Natural gas hydrate exploitation multi-physical field evolution simulation test device and method

Abstract

The invention discloses a natural gas hydrate exploitation multi-physical field evolution simulation test device. The natural gas hydrate exploitation multi-physical field evolution simulation test device comprises a reactor; the reactor is arranged in a temperature control module; the reactor is connected with a liquid supply module, a gas supply module, a back pressure control module, a confining pressure loading module and a data measurement and acquisition module. The invention also discloses a natural gas hydrate exploitation multi-physical field evolution simulation test method. According to the method, an electrical resistance tomography technology is adopted to perform real-time measurement on material contents in sediments especially the saturation of hydrates; real-time measurement is performed on the volume change of the sediments based on the volume change of confining pressure fluid; and the experimental simulation work of temperature field, flow field and displacement field evolutionary processes in hydrate depressurization exploitation can be realized based on experimental data such as temperature, pore pressure and flow rate (gas generation and water generation rate).

Description

Technical field [0001] The invention belongs to the technical field of unconventional oil and gas reservoir exploitation engineering, and specifically relates to a multi-physical field evolution simulation test device for natural gas hydrate exploitation. The invention also relates to a natural gas hydrate exploitation multi-physical field evolution simulation test method. Background technique [0002] The exploitation of natural gas hydrate is highly valued by governments, universities and research institutions in various countries, and has become a research hotspot in unconventional oil and gas reservoir engineering. The South my country Sea contains abundant hydrate resources, and the implementation of trial mining of sea hydrates is imminent. However, there are still some problems in the mechanism of hydrate mining, especially the research on the evolution mechanism of multi-physical fields in the formation during hydrate mining. To meet the actual needs of the project. [0003...

AI Technical Summary

Problems solved by technology

Many countries have carried out the design and construction of hydrate mining simulation experimental devices, focusing on the measurement of temperature field and partial flow field (pore pressure and flow velocity) during hydrate mining, while the measurement of material content, especially the saturation of solid hydrate It is relatively rare, and it is impossible to measure the propagation process of the hydrate decomposition front, especially the propagation process of the hydrate decomposition front in deep-sea loose sediments, and there are few reports on the displacement field (strain)

Existing experimental devices limit the experimental simulation of multi-physics evolution mechanism of hydrate decompression mining, which affects the safety, production efficiency and on-site monitoring of hydrate decompression production.

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