Testing simulation system for generation process of diffusion hydrates in precipitates and testing method thereof

A hydrate generation and experimental simulation technology, applied in chemical/physical processes, methods of chemically changing substances using atmospheric pressure, chemical instruments and methods, etc., can solve the problems of hydrate sample collection and in-situ measurement difficulties, etc. Achieve the effect of fast reaction rate, simple operation and convenient data collection

Active Publication Date: 2011-07-13
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an experimental simulation system and method for the diffusion-type hydrate formation process in sediments, so as to solve the difficult problems of current hydrate sample collection and in-situ measurement, and simulate natural deposition in the laboratory according to the actual physical and chemical environment of the seabed The formation process of diffuse hydrate in sediments, the influence of different external conditions on the formation process and distribution of hydrates in sediments, the saturation of hydrates in sediments, and the inversion of hydrate content in nature

Method used

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  • Testing simulation system for generation process of diffusion hydrates in precipitates and testing method thereof
  • Testing simulation system for generation process of diffusion hydrates in precipitates and testing method thereof
  • Testing simulation system for generation process of diffusion hydrates in precipitates and testing method thereof

Examples

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Embodiment 1

[0054] Using quartz sand, methane, and brine as experimental materials, the experiment system of the present invention is used to conduct an experiment on the formation of natural gas hydrate in sediments to simulate the formation process of natural gas hydrate in sediments.

[0055] First, the quartz sand sample obtained from seabed mining was cleaned with distilled water, put into an oven to dry the water, and sieved with 60-mesh and 80-mesh sieves to obtain quartz sand particles with a particle size distribution between 180 μm and 250 μm. The material porosity is 36.7%, and the sand after getting 95g sieving is put into small polytetrafluoroethylene reactor 16. Then prepare brine with a mass fraction of NaCl of 3.5%, and drop it into the sediment with a dropper, and the dropping amount is 16 g. Then cover the small polytetrafluoroethylene reaction kettle cover of screen shape, fix it with screws, put the small polytetrafluoroethylene reaction kettle into the large stainless...

Embodiment 2

[0059] With quartz sand, mixed gas (CH 4 : 91.85%; C 2 h 6 : 5.09%; C 3 h 8 : 3.06%), brine as experimental materials, using the invented experimental system device to carry out the formation experiment of natural gas hydrate in sediments, and simulate the formation process of natural gas hydrates in sediments.

[0060] The quartz sand is sieved with a 40-60 mesh sieve, and the particle size distribution is between 250 μm and 380 μm. The measured porosity of the sediment is 41.9%. Take 95g of the sieved sand and put it into a small polytetrafluoroethylene reaction kettle . Then prepare brine with a mass fraction of NaCl of 3.5%, drop it into the sediment with a dropper, the amount of dropping is 39g, and the pore water will fill the pore space of the sediment. Put the small polytetrafluoroethylene reactor into a large stainless steel reactor, seal it and place it in a water bath for 12 hours, then vacuumize the system, and then enter the air with a gas pressure of 5MPa. A...

Embodiment 3

[0062] Using quartz sand, methane, and distilled water as experimental materials, the invented experimental system device is used to conduct experiments on the formation of natural gas hydrate in sediments to simulate the formation process of natural gas hydrates in sediments.

[0063] The quartz sand is sieved with a sieve of 80-100 mesh, the particle size distribution is between 150μm-180μm, and the porosity of the sediment is measured to be 38.2%. Take 95g of the sieved sand and put it into a small polytetrafluoroethylene reaction kettle . Then drop about 27g of distilled water with a dropper, water accounts for about 75% of the porosity of the sediment. Put the reaction kettle into a large reaction kettle and seal it and place it in a water bath for 12 hours, then vacuumize the system, then take in air, the gas pressure is 12MPa, and carry out the constant volume experiment. Set the temperature of the water bath at 25°C and keep it for 48 hours. Then the temperature of t...

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Abstract

The invention discloses a testing simulation system for the generation process of diffusion hydrates in precipitates and a testing method thereof; in the system, a gas storage cylinder is connected with a pipeline and is connected with a valve; a manual booster pump is connected with a gas buffering tank, the middle part of the manual booster pump is provided with a valve, and the upper end of the gas buffering tank is connected with a large reaction kettle; a vacuum pump is connected with a pipeline, and the upper end of the vacuum pump is provided with a valve; a small reaction kettle is arranged in the large reaction kettle, the large reaction kettle is arranged in a constant temperature water bath to be connected with the pipeline, and an intake air passageway is internally provided with a flow meter; the upper end cover of the large reaction kettle is provided with a hole; a pressure sensor, a temperature sensor and an LCR (inductor-capacitor-resistor) resistance probe are arranged in the hole; and the temperature sensor, the pressure sensor, the flow meter and a DC (direct current) voltage stabilization power supply are respectively connected with a data collector. The testing simulation system and the testing method can be used for researching the generation process of natural gas hydrates in precipitates; a constant volume test can be carried out, and simultaneously a constant pressure test also can be carried out; and the testing simulation system and the testing method have the characteristics of simpleness in operation, convenience for data collection and quick reaction speed.

Description

technical field [0001] The invention relates to an experimental simulation system and an experimental method for a diffusion-type hydrate formation process in sediments. Background technique [0002] Natural gas hydrate refers to some low molecular weight gases and some volatile liquids, such as C 1 -C 4 Light hydrocarbons, N 2 , O 2 , CO 2 、H 2 S, ethylene oxide, tetrahydrofuran, and halogenated alkanes can form a non-stoichiometric crystalline compound with a cage structure with water at a temperature close to the freezing point and at a relatively high pressure, which is usually called a clathrate hydrate. hydrates), referred to as hydrates. Can be regarded as a class of host-guest (host-guest) compounds or materials. Water molecules (hydrogen bonds) form a lattice structure, and gas molecules fill the voids between the lattices. At present, there are mainly three types of hydrate structures found in nature: type I, type II, and type H. The theoretical gas storag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/00C10L3/10
Inventor 臧小亚梁德青吴能友
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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