CN201508357U - Phase equilibrium testing device for gas hydrate in submarine sediment - Google Patents
Phase equilibrium testing device for gas hydrate in submarine sediment Download PDFInfo
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- CN201508357U CN201508357U CN2009202290145U CN200920229014U CN201508357U CN 201508357 U CN201508357 U CN 201508357U CN 2009202290145 U CN2009202290145 U CN 2009202290145U CN 200920229014 U CN200920229014 U CN 200920229014U CN 201508357 U CN201508357 U CN 201508357U
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Abstract
The utility model discloses a phase equilibrium testing device for gas hydrate in submarine sediment and relates to the experiment testing technology of the gas hydrate in the submarine sediment. The testing device mainly comprises a high-pressure reactor (10), a hydraulic-pressure container (20), a gas-water separator (30), a first piston pump (41), a second piston pump (42), a vacuum pump (50), a fluid flowmeter (60), a gas supply device (70), a constant temperature device (80) and a data acquisition system (90). The utility model realizes the simulation of the formation and decomposition processes of the submarine gas hydrate and the relationship testing of the phase equilibrium under the condition that the gas-water pressure can be controlled independently; in addition, the testing device has simple structure, high precision, good stability and simple and easy operation and does not have very powerful skill requirement on the tester.
Description
Technical field
The utility model relates to the experiment test technology of gas hydrate in the marine bottom sediment, relates in particular to natural gas hydrate phase balance emulation proving installation in a kind of marine bottom sediment.
Background technology
Gas hydrate are methane (CH
4) wait the natural-gas molecule under certain pressure and temperature conditions, be inhaled in the space of cage type water clusters structure, thereby form a kind of solid shape material.As a kind of strategic substitute energy, gas hydrate have huge business development and are worth, and estimate will occupy main status in the energy consumption structure in this century.Along with the worsening shortages of oil and natural gas resource, this novel substitute energy of development of natural gas hydrate just seems particularly urgent.Simultaneously, what the irrational exploitation of gas hydrate can cause the geology landslide in seabed and methane gas discharges into atmosphere in a large number, thus the safety of grave danger marine structure and cause global warming.Therefore, be the inevitable requirement that will large-scale develop and utilize gas hydrate future at the research of sea bed gas hydrate, have very important strategic importance.
Sea bed gas hydrate is stable under the high pressure low temperature condition, will decompose under normal temperature and pressure conditions.Be used for the laboratory study expense of having relatively high expectations from submarine sampling, so the formation sample preparation of experiment lab simulation sea bed gas hydrate just seems particularly important.It is synthetic synthetic with the strange land gas transfer that the formation of sea bottom hydrate can be divided into local non-migrating gas; Migration is synthetic to be divided into gaseous diffusion migration and two kinds of patterns of seepage migration again by migration model.Under the gas permeation migration model, the formation of gas hydrate is actual be water in the unsaturated soil under certain pressure-temperature conditions, water and natural-gas molecule form gas hydrate.The gas hydrate that form under this pattern are cemented between the soil particle, are one of key factors that contains the raising of gas hydrate sediment strength.
Still be in starting and exploratory stage at containing the sedimental relevant Study on Phase Equilibrium of gas hydrate at present, existing test and method for making sample all are mainly to concentrate on local non-migrating gas synthesized hydrate.Mainly contain three kinds: the one, mix with soil particle making the pulverulent solids hydrate in advance, then the potpourri of making is put into the environment of low temperature to carry out experiment; The 2nd, apply the certain pressure natural-gas to soil sample, reduce temperature formation then and contain gas hydrate sediment sample; The 3rd, directly in the saturated soil sample of low temperature, apply gases at high pressure and in the soil pores, form hydrate.These three kinds of experimental techniques only consider that with device gas pressure change forms and the influence of decomposing hydrate in the sediment.For water-filled saturated soil in the hole, gaseous tension equals water pressure, and formation and decomposition and the phase equilibrium relationship that contains hydrate in the gas hydrate sediment can be simulated and be tested to above test method with device.When hydrate generates with decomposition in containing gas hydrate, if having the unsaturation attitude sediment of aqueous water and free gas in the hole simultaneously, because the capillarity influence makes gaseous tension no longer equal water pressure.Therefore, independent control with measure contain gas-water pressure in the gas hydrate sediment contain that hydrate generates with the phase equilibrium relationship that decomposes significant in the gas hydrate sediment.The data that still do not have at present the test that balances each other of gas hydrate in the unsaturation sediment, the more equilibrium of the gas hydrate under the suction situation in control unsaturation sediment not.
Be directed to this problem, the utility model will mainly solve the test problem of generation and decomposition and the phase equilibrium relationship under gas with various and water pressure condition of gas hydrate in the unsaturation sediment.
Summary of the invention
The purpose of this utility model just is to overcome the shortcoming and defect that prior art exists, and natural gas hydrate phase balance emulation proving installation in a kind of marine bottom sediment is provided.
This device can be controlled suction force state in the sediment by independent control air-water pressure, measures under the different suction force state unsaturation sediment to the phase balance condition of gas hydrate; Simultaneously, can also under situation about not needing, measure the native water family curve of unsaturated soil than higher precision.
This method can independently be controlled gas-water pressure in the sediment, guarantees suction control accurately and sediment unsaturated state, forms unsaturation and contains gas hydrate sediment sample and balance each other test acquisition phase balance condition.
The purpose of this utility model is achieved in that
One, natural gas hydrate phase balance emulation proving installation (abbreviation proving installation) in the marine bottom sediment
This proving installation mainly comprises high-pressure reaction vessel, hydraulic pressure container, gas-water separation container, the 1st, 2 piston pumps, vacuum pump, liquid flowmeter, feeder, thermostat and data acquisition system (DAS);
Its annexation is:
The high-pressure reaction vessel bottom links to each other with liquid flowmeter by the 6th valve with hydraulic pressure container bottom;
High-pressure reaction vessel top links to each other by the 7th valve with gas-water separation container top;
Gas-water separation container top links to each other with the 2nd piston pump again, and the gaseous tension in the 2nd piston pump adjusting steam-water separator is controlled the gaseous tension of soil sample in the high-pressure reaction vessel;
The gas-water separation container also links to each other with the hydraulic pressure container with the 8th valve by the 5th valve, and the hydraulic pressure container also links to each other with the first piston pump, and the gaseous tension in the first piston pump adjusting hydraulic pressure container is controlled the pressure of the water in the high-pressure reaction vessel;
Porous potter's clay plate places the bottom of high-pressure reaction vessel, guarantees the independent control and measurement of gas-water pressure;
Source of the gas links to each other with the gas-water separation container by the 5th valve respectively by behind septum valve, the 1st valve and the high-pressure gas pressure table, links to each other with the hydraulic pressure container by the 8th valve, for device provides working gas;
Safety-valve is connected with the hydraulic pressure container, and assurance test job safety is carried out;
Thermostat links to each other with the water-bath chuck of high-pressure reaction vessel, carbonated drink separation container and the 2nd piston pump respectively by flexible pipe, carries out the thermostatic control to high-pressure reaction vessel, carbonated drink separation container and the 2nd piston pump;
Vacuum pump links to each other with the hydraulic pressure container by the 3rd valve, the 4th valve, whole device is carried out vacuumizing the impurities removal gas disposal, can also carry out the saturated processing of vacuumizing of soil sample;
The 1st pressure transducer links to each other with the gas-water separation container, measures its gaseous tension;
The 1st temperature sensor links to each other with high-pressure reaction vessel, measures its temperature;
The 2nd pressure transducer, the 2nd temperature sensor link to each other with the hydraulic pressure container respectively, measure its gaseous tension and temperature respectively;
Data acquisition system (DAS) links to each other with the 1st, 2 temperature sensors with the 1st, 2 pressure transducers respectively by data line, and the temperature and pressure of real-time monitoring device is dynamic.
The principle of work of this device:
This device mixes the suitable pressure-temperature condition that provides for the air water in high-pressure reaction vessel, make it form gas hydrate, and utilize the high-pressure reaction vessel bottom porous potter's clay plate can percolating water and the character of non-leakage gas has been carried out the independent control of gas-water pressure and has been measured;
Wherein the adjusting of gaseous tension is to utilize second piston pump to regulate, and the gas-water separation container has prevented that water from entering in second piston pump;
Exerting pressure of hydraulic pressure is by the gas in the hydraulic pressure container water to be exerted pressure to provide, and wherein the adjusting of pressure is to utilize the first piston pump to carry out;
On this basis, carry out the synthetic and decomposition of gas hydrate, record the pressure of gas and the pressure of water respectively by the 1st, 2 sensors, the pressure of water can be regarded as the pressure of the formation or the decomposition of gas hydrate, and the difference of air-water pressure is a suction;
The temperature that records by the 1st temperature sensor is that gas hydrate form or the equilibrium temperature when decomposing, and promptly measures by these, can measure the phase balance condition of gas hydrate under different suction conditions more easily.
Two, natural gas hydrate phase balance emulation method of testing (abbreviation method of testing) in the marine bottom sediment
This method of testing comprises the following steps: based on above-mentioned proving installation
1. sample is installed
Soil sample (is simulated sea bottom hydrate resistant strata soil density 1.0～2.5g/cm by setting dry density
3) and water percentage (2～40%) evenly pack in the high-pressure reaction vessel, in the hydraulic pressure container, add the distillation de-ionate of an amount of (be approximately hydraulic pressure container volume 3/4) again;
2. check impermeability
In proving installation, charge into nitrogen to 6～8Mpa, constant if proving installation can be kept pressure 3～4 hours, think that then the proving installation impermeability is intact;
3. vacuumize
Vacuumize 15～30min, discharge the assorted different gas in the proving installation;
4. water filling is saturated
Bleed finish after, open the 6th valve and make water in the hydraulic pressure container enter into high-pressure reaction vessel to make soil sample saturated;
5. apply gas
Open the 1st, 5,7,8 valves, regulate pressure-regulating valve pressure is transferred to the setup pressure value (steady pressure that setting value must guarantee to form hydrate in the high-pressure reaction vessel and keep hydrate, carbon dioxide is 2～4Mpa, and methane is to close the 1st valve and pressure-regulating valve after 6～10Mpa);
6. regulate the suction size
Regulate the 1st, 2 piston pumps, make pressure in the carbonated drink separation container greater than the pressure in the hydraulic pressure container, and its difference is a setting value (0.1～1.5Mpa);
7. the sample preparation of lowering the temperature
Start thermostat, (set under the condition that must guarantee pressure in the above by temperature value to setting value for the temperature value that reduces high-pressure reaction vessel, the temperature and pressure condition of high-pressure reaction vessel on the border of balancing each other with interior gas hydrate, generally be set at-2～4 ℃), utilize the cold liquid of low temperature (utilize alcohol, solidifying point for-114 ℃) circulation in the chuck of high-pressure reaction vessel to reduce the soil sample temperature to setting value and keep constant as refrigerating fulid;
8. the sample preparation is finished
If the gaseous tension in high-pressure reaction vessel and the hydraulic pressure container keeps stablizing when constant, then (temperature is the synthesis temperature of gas hydrate to decidable under corresponding temperature, pressure condition, pressure is last steady pressure, general temperature is-2～4 ℃, pressure is 0.5～4Mpa), hydrate in the high-pressure reaction vessel in the soil sample is synthetic to be finished, i.e. sample preparation is finished.
9. measure hydrate phase balance condition
A, close the 5th, 6 valves, open the 7th valve, improve the desired temperature of thermostat, make the decomposition of hydrate in the high-pressure reaction vessel, the gas that decomposes the back generation raises the pressure in high-pressure reaction vessel and the gas-water separation container, and it is stable to keep-up pressure after a period of time (3～4 hours), and the pressure and temperature of this moment is hydrate phase balance condition;
B, adjusting temperature, the phase balance condition of hydrate in the soil sample can be drawn temperature-pressure curve under the test condition of different temperatures.
C, utilize data acquisition system (DAS) to carry out automatic collection, transmission and the record of test figure.
The utlity model has following advantage and good effect:
1. can simulate in the seabed unsaturation sediment gas hydrate sample preparation and record its phase balance condition;
2. independently control air-water pressure, realized the control of suction in the sediment, can carry out under different suction situations, recording the phase balance condition of gas hydrate in the seabed unsaturation sediment, consider that suction generates and the influence of decomposing gas hydrate in the unsaturation sediment.
3. the utility model has been realized that sea bed gas hydrate under air-water pressure independence controlled condition forms with the simulation of decomposable process and has been tested with phase equilibrium relationship.This apparatus structure is simple, precision is high, good stability, easy and simple to handle, and testing crew is not had very strong technical ability requirement.
Description of drawings
Fig. 1 is the structural representation of test unit.
Wherein:
The 10-high-pressure reaction vessel;
20-hydraulic pressure container;
30-gas-water separation container;
41,42-the 1st, 2 piston pumps;
The 50-vacuum pump;
The 60-liquid flowmeter;
The 70-feeder;
The 71-source of the gas, 72-pressure-regulating valve, 73-safety valve, 74-gaseous tension indicator gauge;
The 80-thermostat;
The 90-data acquisition system (DAS).
P1, P2-the 1st, 2 gas pressure sensors;
T1, T2-the 1st, 2 temperature sensors;
M-high pressure stainless steel pipeline;
V1～V8-the 1st～8 valve;
I-porous potter's clay plate.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, device
As shown in Figure 1, this test unit mainly comprises high-pressure reaction vessel 10, hydraulic pressure container 20, gas-water separation container the 30, the 1st, 2 piston pumps 41,42, vacuum pump 50, liquid flowmeter 60, feeder 70, thermostat 80 and data acquisition system (DAS) 90;
Its annexation is:
High-pressure reaction vessel 10 bottoms link to each other with liquid flowmeter 60 by the 6th valve V6 with hydraulic pressure container 20 bottoms;
High-pressure reaction vessel 10 tops link to each other by the 7th valve V7 with gas-water separation container 30 tops;
Gas-water separation container 30 tops link to each other with the 2nd piston pump 42 again, and the gaseous tension in the 2nd piston pump 42 adjusting steam-water separators 30 is controlled the gaseous tension of soil sample in the high-pressure reaction vessel 10;
Gas-water separation container 30 also links to each other with hydraulic pressure container 20 with the 8th valve V8 by the 5th valve V5, hydraulic pressure container 20 also links to each other with first piston pump 41, and the gaseous tension in the first piston pump 41 adjusting hydraulic pressure containers 20 is controlled the pressure of the water in the high-pressure reaction vessel 10;
Porous potter's clay plate I places the bottom of high-pressure reaction vessel 10, guarantees the independent control and measurement of gas-water pressure;
After source of the gas 71 passes through septum valve the 72, the 1st valve V1 and high-pressure gas pressure table 74, link to each other with gas-water separation container 30 by the 5th valve V5 respectively, link to each other with hydraulic pressure container 20 by the 8th valve V8, for device provides working gas;
Safety-valve 73 is connected with hydraulic pressure container 20, and assurance test job safety is carried out;
The 1st pressure transducer P1 links to each other with gas-water separation container 30, measures its gaseous tension;
The 1st temperature sensor T1 links to each other with high-pressure reaction vessel 10, measures its temperature;
The 2nd pressure transducer P2, the 2nd temperature sensor T2 link to each other with hydraulic pressure container 20 respectively, measure its gaseous tension and temperature respectively;
Data acquisition system (DAS) 90 links to each other with the 1st, 2 pressure transducer P1, P2 and the 1st, 2 temperature sensor T1, T2 respectively by data line, and the temperature and pressure of real-time monitoring device is dynamic.
Two, each parts of test unit
1, high-pressure reaction vessel 10
High-pressure reaction vessel 10 adopts special stainless steel material to make, and top utilizes the O RunddichtringO to obturage and the sealing of linking closely of coarse thread bolt, thereby reaches seal request and make things convenient for the purpose of installing/dismounting;
Select HBS-A2 (Hai Keyi) for use;
Built-in the 1st temperature sensor T1, its end is stretched in the middle of the soil sample.
Interior dress test soil sample.
2, the hydraulic pressure container 20
Select HBS-B2 (Hai Keyi) for use.
The temperature of water in built-in the 2nd temperature sensor T2 measuring vessel; The pressure of gas changes in also built-in the 2nd pressure transducer P2 measuring vessel.
An amount of distilled water is adorned in inside, and upper space is an experimental gas,
3, the gas-water separation container 30
Adopt special stainless steel material to make, inside is gas, and an amount of drying agent is equipped with in the bottom, removes the steam that experimental gas carries secretly and prevents that steam from entering in the piston pump 42.
Select HBS-C2 (Hai Keyi) for use.
4, the 1st, 2 piston pumps 41,42
1st, 2 piston pumps 41,42 are product commonly used.
The 1st piston pump 41 main sizes of regulating the pressure of the water in the hydraulic pressure container 20; Control the size of the pressure of the water in the hydraulic pressure container 20 by the variation of adjustments of gas pressure, thereby control the size of the hydraulic pressure in the high-pressure reaction vessel 10.
The 2nd piston pump 42 main gaseous tensions of regulating in the gas-water separation container 30 are controlled the size of the gaseous tension in the autoclave.
Select HBS-D1 (Hai Keyi) for use
5, vacuum pump 50
Select WLW-50A (Jiangsu) for use.
6, feeder 70
Feeder 70 comprises gas bomb 71, pressure-regulating valve 72, safety valve 73, gaseous tension indicator gauge 74;
Pressure-regulating valve 72 is selected ZDLQ (Shanghai) for use;
Safety valve 73 is selected A28H (Shanghai) for use;
Gaseous tension indicator gauge 74 is selected 2-5000 (Shanghai) for use;
7, thermostat 80
Temperature range :-20～20 ℃, temperature control precision: ± 0.2 ℃, built-in ebullator.
Select THX2020 (Ningbo of Zhejiang) for use.
8, data acquisition system (DAS) 90
Data acquisition system (DAS) 90 adopts multifunctional data acquiring integrated circuit board, PC computing machine and data acquisition software to carry out data acquisition, transmission and record.
Select HBSPQ-2 (the easy-to-use Science and Technology Ltd. of Changzhou) for use.
9,1-7 valve (V1-V7)
1-7 valve (V1-V7) is product commonly used.
Two ends caliber Φ 6mm adopts stainless steel to make withstand voltage 50MPa.
10, liquid flowmeter 60
Select common high precision type for use.
11, the 1st, 2 temperature sensor T1, T2 are product commonly used.
Select Pt100/ φ 3 (Beijing) for use, precision: 0.1 ℃.
12, the 1st, 2 pressure transducer P1, P2
1st, 2 pressure transducer P1, P2 is product commonly used.
Select ND-1 for use, (Xi'an), pressure limit: 0～40Mpa; Precision: 0.1%FS.
13, high pressure line M
High pressure line M selects plain edition for use; Caliber Φ 6mm adopts stainless steel to make withstand voltage 50MPa.
14, the 1st～8 valve V1～V8
The 1st～8 valve V1～V8 selects common high pressure valve for use.
Claims (1)
1. natural gas hydrate phase balance emulation proving installation in the marine bottom sediment is characterized in that:
This test unit mainly comprises high-pressure reaction vessel (10), hydraulic pressure container (20), gas-water separation container (30), the 1st, 2 piston pumps (41,42), vacuum pump (50), liquid flowmeter (60), feeder (70), thermostat (80) and data acquisition system (DAS) (90); Its annexation is:
High-pressure reaction vessel (10) bottom links to each other with liquid flowmeter (60) by the 6th valve (V6) with hydraulic pressure container (20) bottom;
High-pressure reaction vessel (10) top links to each other by the 7th valve (V7) with gas-water separation container (30) top;
Gas-water separation container (30) top links to each other with the 2nd piston pump (42) again;
Gas-water separation container (30) also links to each other with hydraulic pressure container (20) with the 8th valve (V8) by the 5th valve (V5), and hydraulic pressure container (20) also links to each other with first piston pump (41);
Porous potter's clay plate (I) places the bottom of high-pressure reaction vessel (10);
Source of the gas (71) links to each other with gas-water separation container (30) by the 5th valve (V5) respectively by behind septum valve (72), the 1st valve (V1) and the high-pressure gas pressure table (74), links to each other with hydraulic pressure container (20) by the 8th valve (V8);
Safety-valve (73) is connected with hydraulic pressure container (20);
Thermostat (80) links to each other with high-pressure reaction vessel (10), carbonated drink separation container (30) and the water-bath chuck of the 2nd piston pump (42) respectively by flexible pipe;
Vacuum pump (50) links to each other with hydraulic pressure container (20) by the 3rd valve (V3), the 4th valve (V4);
The 1st pressure transducer (P1) links to each other with gas-water separation container (30);
The 1st temperature sensor (T1) links to each other with high-pressure reaction vessel (10);
The 2nd pressure transducer (P2), the 2nd temperature sensor (T2) link to each other with hydraulic pressure container (20) respectively;
Data acquisition system (DAS) (90) links to each other with the 1st, 2 temperature sensors (T1, T2) with the 1st, 2 pressure transducers (P1, P2) respectively by data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202290145U CN201508357U (en) | 2009-10-23 | 2009-10-23 | Phase equilibrium testing device for gas hydrate in submarine sediment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202290145U CN201508357U (en) | 2009-10-23 | 2009-10-23 | Phase equilibrium testing device for gas hydrate in submarine sediment |
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| Publication Number | Publication Date |
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| CN201508357U true CN201508357U (en) | 2010-06-16 |
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| CN2009202290145U Expired - Fee Related CN201508357U (en) | 2009-10-23 | 2009-10-23 | Phase equilibrium testing device for gas hydrate in submarine sediment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257203A (en) * | 2012-02-16 | 2013-08-21 | 中国科学院物理研究所 | High-pressure integrated experiment apparatus for novel energy hydrate |
| CN103424532A (en) * | 2012-05-22 | 2013-12-04 | 青岛海洋地质研究所 | Experiment device for researching structural characteristics of hydrate-containing deposit velocity profile |
| CN105136626A (en) * | 2015-10-12 | 2015-12-09 | 西南石油大学 | Natural gas hydrate decomposition spiral testing device |
| CN107620594A (en) * | 2017-08-08 | 2018-01-23 | 广州海洋地质调查局 | The temperature-time of hydrate collection develops expression, device and user terminal |
-
2009
- 2009-10-23 CN CN2009202290145U patent/CN201508357U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257203A (en) * | 2012-02-16 | 2013-08-21 | 中国科学院物理研究所 | High-pressure integrated experiment apparatus for novel energy hydrate |
| CN103424532A (en) * | 2012-05-22 | 2013-12-04 | 青岛海洋地质研究所 | Experiment device for researching structural characteristics of hydrate-containing deposit velocity profile |
| CN105136626A (en) * | 2015-10-12 | 2015-12-09 | 西南石油大学 | Natural gas hydrate decomposition spiral testing device |
| CN107620594A (en) * | 2017-08-08 | 2018-01-23 | 广州海洋地质调查局 | The temperature-time of hydrate collection develops expression, device and user terminal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100616 Termination date: 20111023 |