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Method for determining content of unhydrated water in hydrate based on nuclear magnetic signal intensity

A technology of signal strength and water content, used in measurement devices, analysis by nuclear magnetic resonance, water resource assessment, etc., to avoid estimation errors

Active Publication Date: 2021-08-10
NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

[0005] At present, domestic determination methods for unhydrated water content are all estimates, and the specific determination method is still blank

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  • Method for determining content of unhydrated water in hydrate based on nuclear magnetic signal intensity
  • Method for determining content of unhydrated water in hydrate based on nuclear magnetic signal intensity
  • Method for determining content of unhydrated water in hydrate based on nuclear magnetic signal intensity

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Embodiment Construction

[0036] A method for determining the content of unhydrated water in hydrates based on nuclear magnetic signal intensity, comprising the following steps:

[0037] ⑴ The main components are 1 h 2 O and 2 h 2 O mixture as a standard sample, and using 2 h 2 Porosity of O frame standard.

[0038] use 2 h 2 The reason for the porosity of the O frame standard sample is: due to the 1 h 2 O and 2 h 2 in the mixture of O 2 H nuclei have no NMR response, so it can be measured 1 The intensity of the NMR signal corresponding to the H nucleus, that is, the NMR signal corresponding to the water content in the standard sample.

[0039] (2) Establish the relational expression of the NMR signal intensity of the standard sample with a porosity of 30% changing with temperature:

[0040] Take 10 mL of the standard sample with a porosity of 30%, and use a low-field nuclear magnetic resonance instrument to calibrate the NMR signal intensity of the standard sample at different temperatur...

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Abstract

The invention relates to a method for determining the content of unhydrated water in hydrate based on nuclear magnetic signal intensity, which comprises the following steps: (1) taking a mixture with main components of 1H2O and 2H2O as a standard sample, and constructing the porosity of the standard sample by using 2H2O; (2) establishing a relational expression that the nuclear magnetic signal intensity of the standard sample with the porosity of 30% changes along with the temperature; (3) measuring and calculating the volume and porosity of the sand sample by taking sand with different particle sizes as a porous medium; (4) carrying out a methane hydrate formation experiment in the porous medium; (5) collecting a nuclear magnetic signal of the unhydrated water, and simultaneously obtaining a T2 relaxation distribution diagram of the unhydrated water; (6) calculating the content of unhydrated water; (7) calculating the mass of the methane hydrate; and (8) calculating the methane hydrate saturation Sh. The dynamic change characteristics of porous medium hydrate formation are directly, effectively and accurately analyzed on the basis of the perspective of unhydrated water, and the method has important theoretical research significance on exploration and prediction of natural gas hydrate mineral reserves, commercial exploitation and exploitation technology research and development in the future.

Description

technical field [0001] The invention relates to the fields of energy and chemical industry, in particular to a method for determining the content of unhydrated water in hydrates based on the intensity of nuclear magnetic signals. Background technique [0002] The conditions of hydrate occurrence areas in nature are generally more complex, and most of them are gas hydrate-bearing deposits. Due to the large specific surface area of ​​porous media, the interfacial phenomenon is extremely prominent, and often exhibits strong interfacial tension and capillary condensation, which makes the formation of gas hydrate in porous media very different from that in free planes. Therefore, porous media The formation characteristics and distribution of natural gas hydrates in China have also become one of the main research contents of natural gas hydrates. [0003] In the past few decades, many scholars have conducted research on the kinetics of hydrate formation in sediments, focusing on ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/082Y02A90/30
Inventor 展静吴青柏张鹏
Owner NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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