CN102513052A - Natural gas hydrate generating device capable of being quickly disassembled for sampling - Google Patents
Natural gas hydrate generating device capable of being quickly disassembled for sampling Download PDFInfo
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- CN102513052A CN102513052A CN2011104444614A CN201110444461A CN102513052A CN 102513052 A CN102513052 A CN 102513052A CN 2011104444614 A CN2011104444614 A CN 2011104444614A CN 201110444461 A CN201110444461 A CN 201110444461A CN 102513052 A CN102513052 A CN 102513052A
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Abstract
The invention discloses a natural gas hydrate generating device capable of being quickly disassembled for sampling, which comprises a reaction kettle (1), a stirring device (2) and a DBR (dihydroxy benzene resorcinol) air bellow (3), wherein the stirring unit (2) comprises a reversible motor (4) and a fixed seat (5), and the fixed seat (5) is arranged on a motor shaft (8) of the reversible motor (4); and the reaction kettle (1) is arranged on the fixed seat (5), the stirring device (2) is arranged in the DBR air bellow (3), the reaction kettle (1) comprises an upper end cover (9), a lower end cover (10), a fixed assembly group (11) and an organic glass tube (12), and an upper connecting rod (15) and a lower connecting rod (16) of the fixed assembly group (11) are connected through a hinge. The device disclosed by the invention has the beneficial effects that generation and decomposition conditions of natural gas hydrates can be simulated, the device is easy and quick to disassemble, and natural gas hydrate samples can be quickly taken out after the natural gas hydrates are generated so as to be tested and experimented.
Description
Technical field
The present invention relates to gas hydrates generating apparatus technical field, particularly the gas hydrates generating apparatus of quick release sampling.
Background technology
Gas hydrates are commonly called as " combustible ice ", are the ice shape crystal of one type of cage structure under certain temperature, pressure condition, generating with the water effect of natural gas, are non-stoichiometry type solid compounds.
Current, serious energy shortage has become the unavoidable especially fact of scarcity of the bottleneck, particularly petroleum resources of restriction China economic development.According to estimates, the methane carbon content in the global gas hydrates is up to 10 * 10
15m
3Methane gas, be equivalent to the twice of conventional fossil fuel total carbons such as the known coal in the whole world, oil and natural gas, and combustion of natural gas can produce harmful polluter, the carcinogen SO that especially generates hardly
2Than burn crude or low two one magnitude of coal.
Gas hydrates possibly become 21 century first-selected clean energy resource the most likely after the conventional oil and natural gas energy.Gas hydrates have the energy density height, it is wide to distribute, scale is big, shallow in burial, one-tenth are hidden characteristics such as physicochemical condition is superior, are the alternative energy sources of tool DEVELOPMENT PROSPECT of 21 century, in the future source of energy structure, have important strategic position.Therefore, natural gas hydrate phase balance emulation research and Study on Microstructure are the most basic and most important advanced problems in natural gas hydrate exploration, exploitation and the marine environmental protection research.
Show that about the gas hydrates Study on Stability gas hydrates are in metastable condition, pressure reduces suddenly or temperature raises suddenly all can cause the rapid decomposition of gas hydrates.Experimental study shows that gas hydrates pressure reduces a half, and its gas hydrates quantity will reduce more than 85%.Therefore, the most important factor of gas hydrates sampling work is exactly fast quick-detach, keeps gas hydrates sample low temperature simultaneously.Current, the instrument that generates gas hydrates both at home and abroad mainly contains PVT instrument and DBR hydrate appearance.But PVT instrument and DBR hydrate appearance all must cool the temperature to room temperature, and pressure could be dismantled after reducing to 1atm.Simultaneously, this step-down process and temperature-fall period must slowly can not descend suddenly, otherwise can cause the loss of instrument, even cause breaking and scrapping of PVT tube and sapphire tube.Wherein, surplus the PVT tube is worth 20,000 yuan, the sapphire tube among the DBR is worth 180,000 yuan.Therefore, the fastest time of dismounting PVT instrument and DBR hydrate appearance is approximately 20～30 minutes.In this process, the gas hydrates that generate in PVT tube or the sapphire tube decompose rapidly along with the rapid drawdown of the rising of temperature, pressure, and when dismounting finished, gas hydrates decomposed already and are over.
So existing instrument can not be realized from laboratory apparatus, taking out gas hydrates that generate and carry out micro-structural test.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of quick-detach soon is provided, the gas hydrates generating apparatus of the desirable gas hydrates sample that goes out to generate.
The object of the invention is realized through following technical scheme:
The gas hydrates generating apparatus of quick release sampling; It comprises agitated reactor, agitating device and DBR bellows; Described agitating device comprises reversible electric machine and holder, and holder is installed on the motor shaft of reversible electric machine, also is provided with two limit switches on the reversible electric machine; Agitated reactor is installed on the holder, and the agitating device that agitated reactor is installed is arranged in the DBR bellows;
Described agitated reactor comprises upper end cover, bottom end cover, fixedly dress group and lucite tube; Upper end cover is installed on lucite tube upper end; And be provided with O RunddichtringO A between upper end cover and the lucite tube, bottom end cover is installed on the bottom of lucite tube, and is provided with O RunddichtringO B between bottom end cover and the lucite tube; Upper end cover and bottom end cover through four fixedly the dress group be connected fixing; Described fixedly dress group is made up of last connecting rod and lower link, and last connecting rod and lower link are connected through the hinge, and the end of last connecting rod is fixed on the upper end cover; Bottom end cover is provided with the U-shaped groove that cooperates with the fixing lower link of dress group, and lower link passes the U-shaped groove of bottom end cover and female fixing by the fastening butterfly that is installed in the lower link end; Be respectively equipped with upper end cover pipe fitting installing hole and bottom end cover pipe fitting installing hole on described upper end cover and the bottom end cover;
Agitated reactor is connected with the sample tube through the pipe fitting that is installed in the upper end cover pipe fitting installing hole, and the sample tube also is connected with the displacement pump.
Described upper end cover is provided with two sensor patchholes, is respectively arranged with pressure sensor and temperature sensor in two sensor patchholes.
The bottom of described upper end cover is provided with external screw thread, and the upper end of lucite tube is provided with internal thread, and upper end cover is connected through screw thread with the lucite tube.
The present invention has the following advantages:
1, agitated reactor of the present invention can bear the pressure of 4MPa, and adopts the lucite tube can directly observe the generative process of gas hydrates as the experiment still.
2, fixedly dress group of the present invention is last connecting rod and the lower link that is connected through the hinge, and dismounting is simple, quick, can after generating gas hydrates, take out, obtain the gas hydrates sample fast, so that gas hydrates are carried out dependence test and experiment.
3, pressure of the present invention generally is lower than 4MPa, behind the generation gas hydrates, also must rush down pressure before the dismounting; But can under normal temperature condition, not carry out, therefore, the gas hydrates instrument removal time approximately is 1～2 minute; Simultaneously; Take the method for liquid nitrogen and ice cube cooling to let the gas hydrates sample that takes out keep low temperature,, make the observation that the gas hydrates sample is carried out microstructure become possibility to delay the decomposition of hydrate.
4, the present invention can simulate the generation and the decomposition condition of gas hydrates, can good coupling be arranged with other large-scale precision instrument, to integrating colleges and universities' gas reservoir experimental resources, carries out exploratory infrastest and has important promotion and facilitation.
5, the present invention is provided with temperature sensor and pressure sensor, is convenient to accurately measure the temperature and pressure parameter of gas hydrates system.
6, the present invention and like product comparative costs are lower, and imported product all is 160 ~ 2,000,000 yuan, and surplus its core component PVT tube just is worth 20,000 yuan, the sapphire tube among the DBR is worth especially up to 180,000 yuan, and therefore, this device cost performance is very high.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is the structural representation of agitating device of the present invention
Fig. 3 is the cutaway view of Fig. 2 along the A-A cross section
Fig. 4 is the structural representation of agitated reactor of the present invention
Fig. 5 is the cutaway view of Fig. 4 along the B-B cross section
Fig. 6 is the cutaway view of Fig. 4 along the C-C cross section
Among the figure, 1-agitated reactor, 2-agitating device, 3-DBR bellows, 4-reversible electric machine, 5-holder; 6-limit switch A, 7-limit switch B, 8-motor shaft, 9-upper end cover, 10-bottom end cover; 11-is the dress group fixedly, 12-lucite tube, 13-O RunddichtringO A, 14-O RunddichtringO B, the last connecting rod of 15-; The 16-lower link, 17-hinge, 18-U-shaped groove, 19-upper end cover pipe fitting installing hole, 20-bottom end cover pipe fitting installing hole; 21-sample tube, 22-displacement pump, 23-sensor patchhole, 24-pressure sensor, 25-temperature sensor.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further description:
As shown in Figure 1; The gas hydrates generating apparatus of quick release sampling, it comprises agitated reactor 1, agitating device 2 and DBR bellows 3, like Fig. 2, shown in Figure 3; Described agitating device 2 comprises reversible electric machine 4 and holder 5; Holder 5 is installed on the motor shaft 8 of reversible electric machine 4, also is provided with two limit switches on the reversible electric machine 4, i.e. limit switch A6 and limit switch B7; Agitated reactor 1 is installed on the holder 5, and the agitating device 2 that agitated reactor 1 is installed is arranged in the DBR bellows 3.
As shown in Figure 4; Described agitated reactor 1 comprises upper end cover 9, bottom end cover 10, fixedly dress group 11 and lucite tube 12; Upper end cover 9 is installed on lucite tube 12 upper ends, and is provided with O RunddichtringO A13 between upper end cover 9 and the lucite tube 12, and bottom end cover 10 is installed on the bottom of lucite tube 12; And be provided with O RunddichtringO B14 between bottom end cover 10 and the lucite tube 12; Upper end cover 9 and bottom end cover 10 through four fixedly dress group 11 be connected fixingly, described fixedly dress group 11 is made up of with lower link 16 last connecting rod 15, last connecting rod 15 is connected through hinge 17 with lower link 16; The end of last connecting rod 15 is fixed on the upper end cover 9; As shown in Figure 6, bottom end cover 10 is provided with the U-shaped groove 18 that cooperates with the fixing lower link 16 of dress group 11, and lower link 16 passes the U-shaped groove 18 of bottom end cover 10 and female fixing by the fastening butterfly that is installed in lower link 16 ends; Like Fig. 5, shown in Figure 6, be respectively equipped with upper end cover pipe fitting installing hole 19 and bottom end cover pipe fitting installing hole 20 on described upper end cover 9 and the bottom end cover 10; As shown in Figure 1, agitated reactor 1 is connected with sample tube 21 through the pipe fitting that is installed in the upper end cover pipe fitting installing hole 19, and sample tube 21 also is connected with displacement pump 22, the pipe fitting installing hole sealing of the bottom end cover 10 of agitated reactor 1.
As shown in Figure 5, described upper end cover 9 is provided with and is respectively arranged with pressure sensor 24 and temperature sensor 25 in 23, two sensor patchholes 23 of two sensor patchholes.
As shown in Figure 4, the bottom of described upper end cover 9 is provided with external screw thread, and the upper end of lucite tube 12 is provided with internal thread, and upper end cover 9 and lucite tube 12 are connected through screw thread.
At present, the instrument that generates gas hydrates both at home and abroad mainly contains PVT instrument, DBR hydrate appearance, and its major parameter is following:
The PVT instrument
Temperature :-30 ℃～180 ℃
Pressure: 0～70Mpa
DBR hydrate appearance
Temperature :-30 ℃～180 ℃
Pressure 0～21MPa
Internal diameter is 2.535cm, and external diameter is 3.81cm, effective volume 75ml
The key technical indexes of gas hydrates generating apparatus of the present invention is following:
Bear pressure: 0～4MPa
Power supply: 220V alternating source
Lucite tube: external diameter 5.0cm, internal diameter 1.9cm, effective volume 15ml
The Pt100 temperature sensor, precision ± 0.1 ℃
Pressure sensor, range 0～10MPa, precision ± 0.5%.
The cooling of gas hydrates generating apparatus of the present invention is in the DBR of PVT appearance bellows 3, to accomplish, and its scope of measuring temperature is-30 ℃～180 ℃, and precision is ± 0.1 ℃.The required bearing temperature of instrument is-30 ℃～100 ℃
Show that about the gas hydrates Study on Stability gas hydrates are in metastable condition, pressure reduces suddenly or temperature raises suddenly all can cause the rapid decomposition of gas hydrates.Experimental study shows that hydrate pressure reduces a half, and its hydrate quantity will reduce more than 85%.Therefore, the most important factor of gas hydrates sampling work is exactly fast quick-detach, keeps gas hydrates sample low temperature simultaneously.
Table 1 gas hydrates generate the data that temperature is measured by DBR hydrate appearance
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| Gas | Gas appearance | 1 | |
|
|
|
|
|
|
| Liquid appearance | Pure water | Pure water | Pure water | Pure water | Pure water | Pure water | Pure water | Pure water | |
| Pressure (MPa) | 2.952 | 5.964 | 8.930 | 11.997 | 2.968 | 5.970 | 8.998 | 11.964 | |
| Temperature (K) | 276.45 | 281.75 | 284.95 | 286.65 | 277.95 | 285.05 | 287.85 | 289.25 |
Wherein, methane accounts for 91.909% in the gas appearance 1, and methane accounts for 86.480% in the gas appearance 2.
Can analyze from above parameter, the gas hydrates generating apparatus of PVT instrument, DBR hydrate appearance and quick release of the present invention sampling can both generate gas hydrates in uniform temperature and pressure limit.
Bear pressure from instrument, PVT instrument and DBR hydrate appearance have its superiority, and its test pressure can reach 70 MPa and 21 MPa respectively, the phase balance condition of gas hydrates under the energy measurement high pressure.
From temperature range, the temperature regulating range basically identical of three kinds of instruments.
From the take-down time angle, behind the generation gas hydrates, PVT instrument and DBR hydrate appearance all must cool the temperature to room temperature, and pressure could be dismantled after reducing to 1atm.Simultaneously, this step-down process and temperature-rise period must slowly can not go up and down suddenly, otherwise can cause the damage of instrument, even cause breaking and scrapping of PVT tube and sapphire tube.Therefore, the fastest time of dismounting PVT instrument and DBR hydrate appearance is about 20～30 minutes.In this process, the gas hydrates that generate in the sapphire tube decompose rapidly along with the decline of the rising of temperature and pressure.When dismounting finished, gas hydrates all decomposed already.So the way of from PVT or DBR hydrate appearance, taking out the gas hydrates sample is worthless.
The pressure limit of the gas hydrates generating apparatus of quick release sampling of the present invention is 0～4MPa, behind the generation gas hydrates, and also necessary pressure release before the dismounting, but can under cryogenic conditions, carry out.Simultaneously, take the method for liquid nitrogen and ice cube cooling to let the gas hydrates sample that takes out keep low temperature, to delay the decomposition of gas hydrates.Therefore, the take-down time of the gas hydrates generating apparatus of quick release sampling of the present invention approximately is 1～2 minute.
So the gas hydrates generating apparatus of quick release sampling of the present invention can generate gas hydrates under the pressure of 0～4MPa.Simultaneously, this device is quick-detach soon, takes out the gas hydrates sample, carries out micro-structural test.
The course of work of the present invention is following: earlier 12 flushings of lucite tube are not hung on barrel to there being the globule with distilled water and deionized water, and again with the liquid wash that is about to experiment 3 times, the sodium dodecyl sulfate solution of adding 5ml 300ppm to lucite tube 12 in; Install lucite tube 12, then pipeline and lucite tube 12 were vacuumized about 15 minutes, open intake valve air inlet appearance in agitated reactor 1; Keep gas pressure at predetermined experimental pressure, start reversible electric machine 4, the reversible electric machine 4 of agitating device 2 drives agitated reactor 1 around motor shaft 8 rotations through motor shaft 8, holder 5; When holder 5 touches limit switch A6; Reversible electric machine 4 beginning is rotated round about, and when holder 5 touches limit switch B7, reversible electric machine 4 rotates once more round about; So repeatedly, realization is to the abundant stirring of liquid in the agitated reactor 1.After generating gas hydrates, the low-temperature condition of holding device is opened the relief valve that is connected with agitated reactor 1 through pipe fitting; After treating that pressure release finishes; It is female to unscrew fastening butterfly, and the fixing lower link 16 of dress group 11 is outwards bent from hinge 17, takes off bottom end cover 10; Can take out gas hydrates, accomplish sampling operation.
Claims (3)
1. the gas hydrates generating apparatus of quick release sampling; It is characterized in that: it comprises agitated reactor (1), agitating device (2) and DBR bellows (3); Described agitating device (2) comprises reversible electric machine (4) and holder (5); Holder (5) is installed on the motor shaft (8) of reversible electric machine (4), also is provided with two limit switches on the reversible electric machine (4); Agitated reactor (1) is installed on the holder (5), and the agitating device (2) that agitated reactor (1) is installed is arranged in the DBR bellows (3);
Described agitated reactor (1) comprises upper end cover (9), bottom end cover (10), fixedly dress group (11) and lucite tube (12); Upper end cover (9) is installed on lucite tube (12) upper end; And be provided with O RunddichtringO A (13) between upper end cover (9) and the lucite tube (12); Bottom end cover (10) is installed on the bottom of lucite tube (12); And be provided with O RunddichtringO B (14) between bottom end cover (10) and the lucite tube (12); Upper end cover (9) and bottom end cover (10) through four fixedly dress group (11) be connected fixing; Described fixedly dress group (11) is made up of last connecting rod (15) and lower link (16), and last connecting rod (15) is connected through hinge (17) with lower link (16), and the end of last connecting rod (15) is fixed on the upper end cover (9); Bottom end cover (10) is provided with the U-shaped groove (18) that cooperates with the fixing lower link (16) of dress group (11), and lower link (16) passes the U-shaped groove (18) of bottom end cover (10) and female fixing by the fastening butterfly that is installed in lower link (16) end; Be respectively equipped with upper end cover pipe fitting installing hole (19) and bottom end cover pipe fitting installing hole (20) on described upper end cover (9) and the bottom end cover (10);
Agitated reactor (1) is connected with sample tube (21) through the pipe fitting that is installed in the upper end cover pipe fitting installing hole (19), and sample tube (21) also is connected with displacement pump (22).
2. the gas hydrates generating apparatus of quick release sampling according to claim 1; It is characterized in that: described upper end cover (9) is provided with two sensor patchholes (23), is respectively arranged with pressure sensor (24) and temperature sensor (25) in two sensor patchholes (23).
3. the gas hydrates generating apparatus of quick release sampling according to claim 1; It is characterized in that: the bottom of described upper end cover (9) is provided with external screw thread; The upper end of lucite tube (12) is provided with internal thread, and upper end cover (9) is connected through screw thread with lucite tube (12).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826551A (en) * | 2015-05-15 | 2015-08-12 | 兰州理工大学 | Hydrate reaction kettle capable of rapidly sampling in non-disturbance manner |
| CN111215019A (en) * | 2018-11-27 | 2020-06-02 | 中国科学院广州能源研究所 | Hydrate generation and sample preparation reation kettle part |
| CN111595889A (en) * | 2020-05-21 | 2020-08-28 | 中国科学院广州能源研究所 | Gas hydrate generation device suitable for local in-situ NMR and PXRD tests |
| CN114082370A (en) * | 2021-11-22 | 2022-02-25 | 西南石油大学 | Rotary multiphase flow hydrate generation experimental device |
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| CN101377478A (en) * | 2007-11-28 | 2009-03-04 | 中国石油大学(北京) | Method for measuring gas hydrate phase balance condition |
| CN201241127Y (en) * | 2008-05-29 | 2009-05-20 | 王科 | Subsection quick-dismantling type bioreactor |
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| CN202410663U (en) * | 2011-12-27 | 2012-09-05 | 西南石油大学 | Natural gas hydrate generating device capable of being rapidly dismantled for sampling |
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Patent Citations (5)
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| CN101377478A (en) * | 2007-11-28 | 2009-03-04 | 中国石油大学(北京) | Method for measuring gas hydrate phase balance condition |
| CN201241127Y (en) * | 2008-05-29 | 2009-05-20 | 王科 | Subsection quick-dismantling type bioreactor |
| CN101458245A (en) * | 2008-12-31 | 2009-06-17 | 四川大学 | Portable high-pressure and gas hydrate experimental device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826551A (en) * | 2015-05-15 | 2015-08-12 | 兰州理工大学 | Hydrate reaction kettle capable of rapidly sampling in non-disturbance manner |
| CN111215019A (en) * | 2018-11-27 | 2020-06-02 | 中国科学院广州能源研究所 | Hydrate generation and sample preparation reation kettle part |
| CN111595889A (en) * | 2020-05-21 | 2020-08-28 | 中国科学院广州能源研究所 | Gas hydrate generation device suitable for local in-situ NMR and PXRD tests |
| CN114082370A (en) * | 2021-11-22 | 2022-02-25 | 西南石油大学 | Rotary multiphase flow hydrate generation experimental device |
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