Device and method for analyzing mechanical properties of hydrate sediments based on low-field nuclear magnetism

A technology for hydrate sediments and mechanical properties, which is used in the fields of analysis, material analysis, measurement devices, etc. using nuclear magnetic resonance

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A technology for hydrate sediments and mechanical properties, which is used in the fields of analysis, material analysis, measurement devices, etc. using nuclear magnetic resonance

CN111289553AActive Publication Date: 2020-06-16QINGDAO INST OF MARINE GEOLOGY

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Embodiment 1

[0026] Embodiment 1. This embodiment proposes a device for analyzing the mechanical properties of hydrate deposits based on low-field NMR.

[0027] refer to figure 1 and figure 2 , including: micro-reactor, and pore pressure control module, confining pressure control module, axial loading control module and data acquisition module.

[0028] The reaction kettle is directly installed on the low-field nuclear magnetic resonance analyzer to realize the analysis of the pore structure of the hydrate-containing sediment. The reaction kettle has a cylindrical structure as a whole and is made of non-nuclear magnetic signal materials such as carbon fibers. Loading reaction frame 11, lateral support ring 8, sample height adjustment pad 9 and rubber sleeve loaded with sediment.

[0029] The radio frequency coil 2 is arranged around the outside of the reactor body 1, and is designed separately from the reactor body 1, which is convenient for installation, disassembly and maintenance. T...

Embodiment 2

[0037] Embodiment 2. This embodiment proposes a method for qualitatively / quantitatively diagnosing damage types of hydrate-containing sediments based on nuclear magnetic resonance detection results.

[0038] The applicant's research found that: under the condition of triaxial fixed-rate axial compression shear or creep compression shear, the basic failure forms inside the sediment can be divided into three basic forms: compaction, expansion and fracturing. The main idea of low-field NMR to obtain the internal pore structure characteristics of sediments is: low-field NMR can obtain the relationship curve between NMR intensity and transverse relaxation time, and the transverse relaxation time of different pore types obtained under low-field NMR conditions The relaxation time is different, and pores of different sizes have different peak positions on the relaxation spectrum, so different levels of pores or cracks can be divided according to the transverse relaxation spectrum. F...

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Abstract

The invention provides a device for analyzing mechanical properties of hydrate sediments based on low-field nuclear magnetism. The device comprises a miniature reaction kettle body mounted on a low-field nuclear magnetic resonance analyzer, a confining pressure cavity positioned in the reaction kettle body, a radio frequency coil arranged on the outer side of the reaction kettle body, a reaction kettle upper end cover, a reaction kettle lower end cover, a hole pressure control module, a confining pressure control module, an axial pressure loading plunger, an axial pressure loading reaction frame and an axial loading control module. The invention discloses an experimental device based on combination of low-field nuclear magnetic resonance detection and three-axis shearing and a corresponding testing method. According to the method and the device, macro-mechanical data of a hydrate reservoir are obtained on a low-field nuclear magnetic resonance platform, meanwhile, micro-pore structureevolution characteristics of the hydrate reservoir in the loading process are obtained, and technical support is provided for cross-scale research of the mechanical property and the deformation mechanism of the natural gas hydrate reservoir.

Description

technical field [0001] The invention relates to the field of basic physical property evaluation of natural gas hydrate reservoirs, in particular to a device and method for analyzing the mechanical properties of hydrate-containing sediments based on the combination of low-field nuclear magnetic resonance (LF-NMR) and triaxial experiments. Background technique [0002] The dynamic response characteristics of reservoir mechanical parameters during hydrate production are crucial to the safety evaluation of hydrate test production. Artificially synthesizing hydrate-containing samples in the laboratory and performing core-scale mechanical test analysis are the main means to obtain the mechanical properties of hydrate-bearing reservoirs. However, large-scale tests can only obtain macroscopic mechanical parameters, and cannot describe the mesoscopic failure process of hydrate-containing sediments. Therefore, it is an important trend of current development to combine macroscopic mec...

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Application Information

Patent Timeline

16 Jun 2020

Publication

CN111289553A

IPC: G01N24/08; G01N15/08; G01N3/24

CPC: G01N3/24; G01N15/088; G01N24/081; G01N2203/0003; G01N2203/0025; G01N2203/0048; G01N2203/0071; G01N2203/0256

Inventors: 吴能友; 李彦龙