CN102042942A - Experimental device for measuring gas storage capacity of natural gas hydrate - Google Patents
Experimental device for measuring gas storage capacity of natural gas hydrate Download PDFInfo
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- CN102042942A CN102042942A CN 201010222113 CN201010222113A CN102042942A CN 102042942 A CN102042942 A CN 102042942A CN 201010222113 CN201010222113 CN 201010222113 CN 201010222113 A CN201010222113 A CN 201010222113A CN 102042942 A CN102042942 A CN 102042942A
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Abstract
The invention relates to an experimental device, in particular to an experimental device for measuring the gas storage capacity of a natural gas hydrate on the basis of a vacuum volumetric method. The experimental device for measuring the gas storage capacity of the natural gas hydrate comprises a standard tube and a sample tube that are respectively connected with a pipeline through a vacuum reducer union, and a valve is arranged between the vacuum reducer union and the pipeline; one end of the pipeline is connected with a pressure sensor, and the other end is connected with a vacuum pump; and a valve is arranged between the vacuum pump and the pipeline. The device not only can be used for measuring the gas storage capacity of various artificially-synthesized gas hydrates, but also can be used for measuring the gas storage capacity of a complex natural gas hydrate sample in deposition. The technical scheme not only can greatly improve the measurement accuracy and precision of the gas storage capacity of the hydrates, but also can be widely applied to the fields of the estimation of the quantity of natural gas hydrate resources and the hydrate gas-content evaluation and the economic calculation for a natural gas hydrate storage and transportation technology.
Description
Technical field
The present invention relates to a kind of experimental provision, relate in particular to a kind of experimental provision of measuring the natural gas hydrate gas storage amount based on the vacuum space method.
Background technology
In the prior art, the method for measuring the hydrate gas-storing capacity mainly contains weight method, indirect calculation method and instrumental method.Instrumental method mainly adopts large-scale analytical and testing instrument such as Raman spectrum, nuclear magnetic resonance, X diffraction to measure the hydration index of hydrate, instrumental method adopts some theoretical models more, there is certain difficulty in mensuration for complicated gas hydrate hydration index in the sediment, and the cost of determination height, the measuring program is complicated; The indirect calculation method mainly adopts measuring instruments such as installing flowmeter on the hydrate experimental provision additional, the gas-storing capacity of the gas consumption by measuring the hydrate generative process or the gas production rate indirect calculation hydrate of decomposable process, this method has the certain significance for the air content of a large amount of hydrates that solve synthetic, and for rare natural gas hydrate sample gas-storing capacity mensuration certain limitation is arranged; Weight method is the hydrate sample to be placed under the status of criterion decompose, the loss in weight of sample was calculated the amount of gas before and after weighing was decomposed, this method also needs to measure by Other Instruments the mean molecular weight of decomposition of hydrate gas, and it is bigger influenced by environment and human factor.
Summary of the invention
Technique effect of the present invention can overcome above-mentioned defective, and a kind of experimental provision of natural gas hydrate gas storage quantitative determination is provided, and it is simple in structure, and measured value is accurate.
For achieving the above object, the present invention adopts following technical scheme: it comprises standard pipe, sample hose, and standard pipe, sample hose link to each other with pipeline by the vacuum reducer union respectively, are provided with valve between vacuum reducer union and the pipeline; One end of pipeline connects pressure transducer, and the other end connects vacuum pump, between vacuum pump and the pipeline valve is set.
Directly measure problem for solving the natural gas hydrate gas storage amount, invented and adopted the vacuum space method to measure the experimental provision of hydrate gas-storing capacity, utilize and decompose the gas-storing capacity of directly measuring hydrate under the hydrate vacuum condition.The cardinal principle that this device is measured the natural gas hydrate gas storage amount is as follows:
Two independently enclosed systems that are full of atmospheric air supposing, there is a dividing plate centre, and the volume of one of them enclosed system is V
0Open dividing plate after another enclosed system vacuumized, treat that the stable back of system pressure is P
0The hydrate sample is placed system, open dividing plate whole system is vacuumized (during keep hydrate not decompose with cooled with liquid nitrogen), remove liquid nitrogen after vacuumizing, hydrate decomposes under vacuum state; Treat that hydrate decomposes fully, after stablizing inside and outside the system, the system internal pressure is P
1Can obtain the volume V that the hydrate decomposed sample produces methane gas according to the equation of gas state under the appearance conditions such as isothermal
1:
The water that decomposition of hydrate is produced is weighed and is converted into the volume of water under the experimental temperature
Can obtain gas-storing capacity (gas-water ratio) S of the hydrate sample of surveying at last:
Experimental provision also comprises cooling device, and cooling device is arranged on the standard pipe or the sample hose outside during experiment.The other end of pressure transducer connects data acquisition unit.
Use this device and measure the technical method of the gas-storing capacity of gas hydrate, main testing fixture impermeability is guaranteed can not leak gas in the experimentation.
This device not only can be used for the gas-storing capacity of the various gas with various hydrates of synthetic, and can measure the gas-storing capacity of natural gas hydrate sample complicated in the sediment.This scheme not only can improve accuracy and the precision that the hydrate gas-storing capacity is measured greatly, also can be widely used in the estimation of gas hydrate stock number and the evaluation of hydrate air content and the business accounting field of gas hydrate storaging and transport technology.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is done detailed description:
Fig. 1 is a structural representation of the present invention.
Embodiment
As shown in Figure 1, this device mainly comprises sample hose 1, standard pipe 2, valve I 3, valve II 4, valve III 5, vacuum pump 6, pressure transducer 7, data acquisition unit 8 and vacuum reducer union 9.Sample hose 1 and standard pipe 2 are quartz glass tube, are connected with stainless pipeline 11 by vacuum reducer union 9, and vacuum reducer union 9 is inner for for the high elastic rubber O-ring seal, can realize that not only vacuum seal can also bearing certain pressure.The range of pressure transducer 7 is-100kPa～100kPa, data acquisition unit 8 can show in real time with storage device in variation of gas pressure in the decomposition of hydrate process.
The embodiment that employing is measured natural gas hydrate gas storage amount experimental provision mensuration hydrate gas-storing capacity based on the vacuum space method is as follows:
(1) testing fixture impermeability: will install according to after the installation drawing installation, valve I 3, valve II 4, valve III 5 are all opened, and connect vacuum pump 6, and begin to vacuumize.On the pending data collecting unit 8 the display device internal pressure be-760mmHg is after a period of time, valve-off I 3.No longer change as continuous 10 hours internal pressures the device good seal then is described.Otherwise, need to check each coupling part of pipeline, and reexamine impermeability, until reaching seal request.
(2) before the experiment, the volume V of accurate bioassay standard pipe 1 part
0
(3) pressure of mensuration calibration tube gas: valve-off II 4, valve III 5, open valve I 3, vacuumize till pressure no longer changes, write down mercury column difference h
0Valve-off I 3 keeps valve II 4, opens valve III 5, writes down mercury column difference h
1, then the pressure of standard pipe gas is: P
0=h
0-h
1
(4) measurement gas volume:
In the bottom of sample hose 2 cooling device 12 is set, in the cooling device 12 liquid nitrogen is housed, put into hydrate sample 10 to be measured then in the sample hose 2, and cooling device 12 is enclosed within on the sample hose 2; Connect vacuum pump 6, open valve I 3, valve III 5, crack valve II 4 is observed pressure and is changed, and standard-sized sheet valve II 4 no longer changes until system pressure when pressure significantly reduces, and this moment, the mercury column difference should be h
0Valve-off I 3 disconnects vacuum pump 6; Remove cooling device 12, hydrate sample 13 decomposes, and pressure rises; When treating that pressure no longer changes, hydrate sample 13 decomposes fully, and valve-off II 4 is put cooling device 12 in the lower end of standard pipe 2, and the gas that decomposes is collected in the standard pipe 2; When pressure no longer changed, gas all was collected in the standard pipe 2, rapidly opened and closed valve II 4 twice (emit the gas in the sample hose 1 and prevent the water in the sample hose 1 is sucked in the standard pipe 2), and this moment, pressure should be near h
0Remove cooling device 12, equitemperature rises to room temperature and keeps a period of time, record force value h
2, then the pressure of gas is in the standard pipe 2: P
1=h
0-h
2, the volume V of gas then
1:
(5) measure the water yield:
The weight of measuring samples pipe 1 (sample hose+remaining water in decomposition back) is W
1Oven dry sample hose 1 is weighed as W then
2The weight of water is
The weight of water is converted into the volume of water under the temperature at that time
The gas-storing capacity S of hydrate sample then:
Claims (3)
1. the experimental provision of a natural gas hydrate gas storage quantitative determination is characterized in that, comprises standard pipe, sample hose, and standard pipe, sample hose link to each other with pipeline by the vacuum reducer union respectively, are provided with valve between vacuum reducer union and the pipeline; One end of pipeline connects pressure transducer, and the other end connects vacuum pump, between vacuum pump and the pipeline valve is set.
2. the experimental provision of natural gas hydrate gas storage quantitative determination according to claim 1 is characterized in that, experimental provision also comprises cooling device, and cooling device is arranged on the standard pipe or the sample hose outside during experiment.
3. the experimental provision of natural gas hydrate gas storage quantitative determination according to claim 1 and 2 is characterized in that, the other end of pressure transducer connects data acquisition unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010222113 CN102042942A (en) | 2010-07-01 | 2010-07-01 | Experimental device for measuring gas storage capacity of natural gas hydrate |
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| CN 201010222113 CN102042942A (en) | 2010-07-01 | 2010-07-01 | Experimental device for measuring gas storage capacity of natural gas hydrate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424545A (en) * | 2015-12-08 | 2016-03-23 | 华南理工大学 | Determination method and device for air content of sediment of natural gas hydrate |
| CN105547913A (en) * | 2016-03-04 | 2016-05-04 | 西南石油大学 | Device and method for testing gas storage density of natural gas hydrate |
| US20170292904A1 (en) * | 2015-09-23 | 2017-10-12 | China University Of Petroleum (East China) | Test system and test method for a simulation experiment of gas hydrate in a porous medium |
| CN107741380A (en) * | 2017-11-28 | 2018-02-27 | 青岛海洋地质研究所 | The experimental provision and method of hydrate changes of contents in a kind of accurate measure small size deposit |
| CN108254033A (en) * | 2017-12-28 | 2018-07-06 | 中国航发四川燃气涡轮研究院 | A kind of gas leakage mass flow meter for aerial engine sealing experiment |
| CN108318100A (en) * | 2018-01-25 | 2018-07-24 | 广州海洋地质调查局 | Measure the system and method that liquid nitrogen frozen hydrate sample decomposes release gas volume |
| CN109507385A (en) * | 2018-12-07 | 2019-03-22 | 中国工程物理研究院化工材料研究所 | A kind of active aluminium content measuring device and its application method |
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| CN1719230A (en) * | 2004-07-09 | 2006-01-11 | 中国石油天然气股份有限公司 | Determination method and apparatus of natural gas hydrate gas storage density |
| JP2008175695A (en) * | 2007-01-18 | 2008-07-31 | Mitsui Eng & Shipbuild Co Ltd | Method and instrument for measuring gas hydrate ratio |
| CN201749071U (en) * | 2010-07-01 | 2011-02-16 | 青岛海洋地质研究所 | Experimental device for natural gas hydrate gas storage determination |
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| JP2008175695A (en) * | 2007-01-18 | 2008-07-31 | Mitsui Eng & Shipbuild Co Ltd | Method and instrument for measuring gas hydrate ratio |
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| 《天然气工业》 20050331 刘昌岭，等 天然气水合物储气量直接测定的实验技术 44-47 1-3 第25卷, 第3期 2 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170292904A1 (en) * | 2015-09-23 | 2017-10-12 | China University Of Petroleum (East China) | Test system and test method for a simulation experiment of gas hydrate in a porous medium |
| US9897529B2 (en) * | 2015-09-23 | 2018-02-20 | China University Of Petroleum (East China) | Test system and test method for a simulation experiment of gas hydrate in a porous medium |
| CN105424545A (en) * | 2015-12-08 | 2016-03-23 | 华南理工大学 | Determination method and device for air content of sediment of natural gas hydrate |
| CN105547913A (en) * | 2016-03-04 | 2016-05-04 | 西南石油大学 | Device and method for testing gas storage density of natural gas hydrate |
| CN105547913B (en) * | 2016-03-04 | 2018-01-16 | 西南石油大学 | Natural gas hydrate gas storage density test device and its method of testing |
| CN107741380A (en) * | 2017-11-28 | 2018-02-27 | 青岛海洋地质研究所 | The experimental provision and method of hydrate changes of contents in a kind of accurate measure small size deposit |
| CN108254033A (en) * | 2017-12-28 | 2018-07-06 | 中国航发四川燃气涡轮研究院 | A kind of gas leakage mass flow meter for aerial engine sealing experiment |
| CN108318100A (en) * | 2018-01-25 | 2018-07-24 | 广州海洋地质调查局 | Measure the system and method that liquid nitrogen frozen hydrate sample decomposes release gas volume |
| CN108318100B (en) * | 2018-01-25 | 2023-10-10 | 广州海洋地质调查局 | System and method for measuring volume of gas released by decomposing liquid nitrogen frozen hydrate sample |
| CN109507385A (en) * | 2018-12-07 | 2019-03-22 | 中国工程物理研究院化工材料研究所 | A kind of active aluminium content measuring device and its application method |
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Application publication date: 20110504 |