A method for determining the content of unhydrated water in hydrates based on NMR signal intensity

A technology of signal strength and water content, applied in measuring devices, using nuclear magnetic resonance for analysis, water resources assessment, etc., to achieve the effect of avoiding estimation errors

Active Publication Date: 2021-12-28
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

Method used

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  • A method for determining the content of unhydrated water in hydrates based on NMR signal intensity
  • A method for determining the content of unhydrated water in hydrates based on NMR signal intensity
  • A method for determining the content of unhydrated water in hydrates based on NMR 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 present invention relates to a kind of method based on nuclear magnetic signal intensity determination unhydrated water content in the hydrate, and this method comprises the following steps: (1) adopt main component to be 1 H 2 O and 2 H 2 O mixture as a standard sample, and using 2 H 2 O the porosity of the frame standard sample; (2) Establish the relational expression of the NMR signal intensity of the standard sample with a porosity of 30% as a function of temperature; (3) Use sand with different particle sizes as the porous medium to measure and calculate the volume and porosity of the sand sample; ⑷Carry out experiments on the formation of methane hydrate in porous media; ⑸Acquisition of NMR signals of unhydrated water and obtain 2 Relaxation distribution diagram; ⑹ Calculation of unhydrated water content; ⑺ Calculation of methane hydrate mass; ⑻ Calculation of methane hydrate saturation S h . Based on the perspective of unhydrated water, the present invention analyzes the dynamic change characteristics of hydrate formation in porous media, which is direct, effective and accurate, and has an important theory for future exploration and prediction of natural gas hydrate reserves, commercial mining and mining technology research and development Significance.

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 ...

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Application Information

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Patent Type & Authority Patents(China)
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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