CN216560402U - Low-frequency acoustic experimental device for large-size hydrate sediments - Google Patents
Low-frequency acoustic experimental device for large-size hydrate sediments Download PDFInfo
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- CN216560402U CN216560402U CN202122903818.2U CN202122903818U CN216560402U CN 216560402 U CN216560402 U CN 216560402U CN 202122903818 U CN202122903818 U CN 202122903818U CN 216560402 U CN216560402 U CN 216560402U
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Abstract
The utility model discloses a low-frequency acoustic experimental device for large-size hydrate sediments, which comprises a high-pressure reaction kettle, a temperature control module, a pressure control module, a sound wave measurement module and a data measurement and processing module. The development of the detection device can simulate conditions such as environmental pressure, temperature, sediment types and the like, synthesize different types of natural gas hydrate reservoirs, emit low-frequency sound waves through a low-frequency sound wave source, detect longitudinal and transverse waves of the hydrate sediment reservoirs by adopting a sound wave tester, and obtain the sound wave velocity characteristics of the different types of hydrate reservoirs. The method adopts low-frequency sound wave detection with the frequency close to the detection frequency of a field sample, and has important significance for correctly understanding the sound wave response characteristics of the natural gas hydrate and establishing accurate quantitative relation between the hydrate saturation and the sound wave parameters of the reservoir stratum.
Description
Technical Field
The utility model belongs to the technical field of marine natural gas hydrate resource exploration and development engineering, and particularly relates to a low-frequency acoustic experimental device for large-size hydrate sediments.
Background
Natural gas hydrate is a very important potential energy source in the natural world at present, and geophysical exploration is still the more important natural gas hydrate exploration method at present, wherein acoustic detection is the more important detection method. A series of simulation detection experiments are also carried out in the laboratory aiming at the acoustic characteristics of the hydrate-containing sediment, and certain knowledge is obtained. However, due to the size of the experimental sample, high frequency ultrasonic detection is mostly performed in the laboratory. The actual situation is that the measurement in the low frequency range is more suitable for the field actual measurement.
At present, there are various experimental devices for acoustic detection of hydrate-containing sediments in laboratories, such as the utility model CN201749073U, which discloses a hydrate acoustic characteristic testing device for detecting the saturation and acoustic characteristic parameters of hydrates in experimental samples; the utility model patent CN202676695U discloses an experimental device for the research of hydrate-containing deposit velocity profile structural characteristics, which extends the acoustic detection from one layer to four layers. Utility model patent CN202661164U discloses an acoustic response characteristic simulation experimental apparatus that submarine gas migration and hydrate formed, realizes the acoustic response characteristic research that different gas flux hydrate formed. However, the existing natural gas hydrate acoustic detection simulation experiment device mainly has two defects, namely the experiment sample is small in size, the experiment uses high-frequency ultrasonic detection, and the difference exists between the experiment sample and field low-frequency detection.
Therefore, in order to meet the requirements of natural gas hydrate resource exploration and development, the conventional acoustic testing device and method must be perfected or modified from the aspects of hydrate sample size and acoustic wave detection frequency, a set of experimental device capable of carrying out low-frequency acoustic wave detection on hydrate-containing sediments in a laboratory is developed, the experimental device is closer to the detection frequency of a field sample, and the experimental device has important significance for correctly understanding the acoustic wave response characteristics of natural gas hydrates in the nature and establishing accurate quantitative relation between the hydrate saturation and the acoustic wave parameters of reservoirs of the hydrate.
SUMMERY OF THE UTILITY MODEL
The utility model provides an experimental device and a test method for low-frequency acoustic detection of hydrate-containing sediments, aiming at solving the problems that the acoustic detection frequency of hydrates in a laboratory is high and is not consistent with the field actual measurement, and provides a new idea for establishing the relationship between the acoustic characteristics of natural gas hydrate samples detected in the laboratory and in the field.
The utility model is realized by adopting the following technical scheme: the utility model provides a low frequency acoustics experimental apparatus to jumbo size hydrate deposit, includes high-pressure batch autoclave, temperature control module, pressure control module, sound wave measurement module and data measurement and processing module, and the high-pressure batch autoclave bottom is equipped with drain and fluid and imports and exports:
the height of the high-pressure reaction kettle is not less than 1000mm, and a temperature sensor, a pressure sensor and a low-frequency sound wave probe which are connected with the data measuring and processing module are arranged on the kettle body of the high-pressure reaction kettle;
the sound wave measuring module comprises a sound wave parameter tester and a low-frequency sound wave probe, the sound wave parameter tester is connected with the low-frequency sound wave probe through a communication data line, and the low-frequency sound wave probe is positioned at the upper end and the lower end of the inner generating cylinder.
Furthermore, the low-frequency sound wave probe is also provided with a sound wave probe ejector rod for compressing and generating a hydrate sample in the inner cylinder.
Further, high pressure batch autoclave includes the urceolus and generates the inner tube, generates the inner tube lateral wall and has laid the multilayer sieve mesh for gas is three-dimensional to the reation kettle inner tube diffusion gas, and the waterproof ventilated membrane has been laid to the inner wall that generates the inner tube, can see through the external gas, can prevent inside deposit moisture outdiffusion outflow again.
Further, the low-frequency sound wave probe sends out a low-frequency signal with the sound wave frequency of 500Hz-5 kHz.
Furthermore, because the reaction kettle body is higher in the longitudinal direction, in order to better monitor the generation state of the hydrate in the space, the temperature sensors are uniformly arranged in multiple groups along the longitudinal direction of the high-pressure reaction kettle.
Furthermore, a water jacket layer for controlling temperature is arranged on the outer side wall of the high-pressure reaction kettle, a loop spiral design is adopted in the water jacket layer, the cooling effect of the kettle body can be guaranteed, the temperature is ensured to be uniform, and a heat preservation layer is arranged on the outer side of the water jacket layer.
Further, the temperature control module comprises a constant-temperature water bath control box, a refrigerant liquid circulation conduit and a water jacket layer outside the reaction kettle; the constant temperature water bath control box is connected with the water jacket layer through a refrigerant liquid circulating conduit.
Further, the pressure control module comprises a high-pressure gas cylinder, a booster pump, a buffer tank and a pressure sensor, wherein one end of the booster pump is connected with the high-pressure reaction kettle, and the other end of the booster pump is connected with the high-pressure gas cylinder; the buffer tank is connected between the booster pump and the high-pressure reaction kettle.
Furthermore, the outer cylinder of the high-pressure reaction kettle is a high-pressure-resistant quick-opening reaction kettle, and a nut type quick-opening structural design is adopted to quickly open the high-pressure reaction kettle.
Furthermore, the experimental device further comprises a lifting frame and a motor, wherein the motor is installed on the lifting frame, and the high-pressure reaction kettle is located below the lifting frame.
Compared with the prior art, the utility model has the advantages and positive effects that:
the scheme of the utility model is that a large-size hydrate simulation experiment device is developed in a laboratory, a low-frequency acoustic source can be used for low-frequency acoustic detection of hydrate-containing sediments, a large-size reaction kettle is designed, the structure of the reaction kettle is improved, an inner cylinder is arranged in the high-pressure reaction kettle and used for placing a sediment sample, a plurality of layers of air holes are distributed around the wall of the inner cylinder, the device is used for diffusing gas into the inner cylinder of the reaction kettle in a three-dimensional way, so that the gas is fully contacted with sediments, the problem of difficult generation of hydrate in a large-scale reaction kettle is solved, the technical problem of contradiction between a large-size sample and high-frequency ultrasonic waves is solved, the low-frequency sound wave emission frequency close to the field reservoir detection is adopted, the fusion of the simulation experiment result in the laboratory and the field detection data is closer, and the problem that the high-frequency ultrasonic detection and the field low-frequency detection result in the laboratory can not be coupled is solved.
Drawings
FIG. 1 is a schematic diagram illustrating the principle of a low-frequency acoustic detection apparatus for hydrate-containing sediment according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a low-frequency acoustic detection apparatus for detecting hydrate-containing sediments according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a high-pressure reaction kettle according to an embodiment of the utility model;
FIG. 4 is a schematic overall layout of a low-frequency acoustic detection apparatus for detecting hydrate-containing deposits according to an embodiment of the present invention;
wherein, 1, a high-pressure reaction kettle; 11. an outer barrel of the reaction kettle; 12. an inner barrel of the reaction kettle; 13. a vent port; 14. a fluid inlet and outlet; 15. the sound wave is externally connected with a quick connector; 16. a sound wave probe ejector rod; 17. generating inner cylinder sieve pores; 18. an end cover of the reaction kettle; 2. a temperature control module; 21. a constant temperature water bath control box; 22. a refrigerant fluid circulation conduit; 23. a water jacket layer is arranged on the outer side of the reaction kettle; 24. a temperature sensor; 3. a pressure control module; 31. a high pressure gas cylinder; 32. a booster pump; 33. a buffer tank; 34. a pressure sensor; 4. an acoustic wave measurement module; 41. a sound wave parameter tester; 42. a sonic probe; 5. a data measurement and processing module; 61. lifting the hanger; 62. an electric motor.
Detailed Description
In order that the above objects and advantages of the present invention may be more clearly understood, a detailed description of the embodiments of the present invention will be made below with reference to the accompanying drawings:
the design idea of the scheme of the utility model is as follows: aiming at (1) the traditional experiment sample is small in size and (2) the laboratory uses high-frequency ultrasonic detection, and the difference exists with field low-frequency detection, an innovative scheme is provided: the existing acoustic testing device and method are perfected from the aspects of hydrate sample size and acoustic wave detection frequency, and a set of large-size experimental device capable of carrying out low-frequency acoustic wave detection on hydrate-containing sediments in a laboratory is developed. The experimental sample is synthesized in situ in a large-size reaction kettle, a sound wave source emits low-frequency sound waves in the experimental process, sound wave signals are received through sediments containing hydrates, and sound wave information of low-frequency detection is obtained and is close to the detection frequency of a field sample, so that the method has important significance for correctly understanding the sound wave response characteristics of the natural gas hydrate in the nature.
In the embodiment, as shown in fig. 1 to 4, the low-frequency acoustic experimental apparatus for large-size hydrate deposits comprises a high-pressure reaction kettle 1, a temperature control module 2, a pressure control module 3, a sound wave measurement module 4, a data measurement and processing module 5, and a movable lifting frame 61 arranged above the high-pressure reaction kettle 1, wherein a motor 62 is arranged on the lifting frame 61; the temperature control module 2, the pressure control module 3 and the acoustic wave measuring module 4 are connected with the high-pressure reaction kettle 1,
as shown in fig. 2 and 3, the high-pressure reactor 1 adopts an inner and outer cylinder design, and comprises an outer cylinder 11 and a generation inner cylinder 12, a vent 13 and a fluid inlet and outlet 14 are reserved at the bottom of the reactor 1, probe mounting holes are reserved at two ends of the top and bottom of the inner cylinder for custom mounting of a sound wave probe 42, test interfaces such as a sound wave external insulation quick-connection joint 15 and the like are reserved at the top of the reactor, and the high-pressure reactor 1 is used for preparing a natural gas hydrate reservoir sample in a laboratory. The side wall of the generating inner cylinder 12 is provided with sieve pores 17, and the inner wall of the generating inner cylinder 12 is provided with a waterproof breathable film, so that external gas can permeate through the waterproof breathable film, and the moisture of internal sediments can be prevented from diffusing outwards and flowing out. The high-pressure reaction kettle 1 is provided with a temperature sensor 24, a pressure sensor 34 and a sound wave probe 42 which are connected with the data measurement and processing module 5 on the kettle body, a water jacket layer 23 for temperature control is arranged on the outer side wall of the high-pressure reaction kettle 1, and a heat insulation layer is arranged on the outer side of the water jacket layer 23.
In this embodiment, the outer cylinder 11 of the high-pressure reactor 1 is a high-pressure resistant quick-opening reactor, and the high-pressure reactor 1 is quickly opened by adopting a nut type quick-opening structure design, and the outer wall of the outer cylinder 11 is provided with an opening to generate an opening on the side wall of the inner cylinder 12, and the opening is used for installing the temperature sensor 24 and detecting the temperature of the sediment inside the reactor. The height of the high-pressure reaction kettle 1 is not less than 1000mm, because the reaction kettle body is higher longitudinally, for better monitoring the generation state of the hydrate in the space, a plurality of groups of temperature sensors are arranged longitudinally on the deposit, because the generation process of the hydrate is a heat release process, the information of the generation condition of the hydrate is obtained by monitoring the temperature change in the reaction process, in the embodiment, 10 groups of temperature sensors 24 are installed, the temperature change conditions of different positions of the hydrate reservoir can be monitored in real time by arranging the temperature sensors at different positions, and then the generation conditions of the hydrate at different positions are reflected.
The high-pressure reaction kettle 1 is made of 316L stainless steel, so that the durability and the safety of equipment are ensured; the highest working pressure of the high-pressure reaction kettle 1 is 30MPa, the precision is +/-0.1%, the inner diameter is phi 300mm, the height of the inner space is 1200mm, a water jacket 23 is adopted for refrigeration, the temperature of a low-temperature constant-temperature circulating water bath box 21 is controlled, the generated inner cylinder 12 is processed by adopting a nylon material with the insulation degree of M omega grade, the inner diameter of the generated inner cylinder 12 is 200mm, and the inner height is 1000 mm.
As shown in fig. 2 and 4, the temperature control module 2 comprises a thermostatic waterbath control box 21, a refrigerant liquid circulation conduit 22 and a water jacket layer 23 outside the reaction kettle; the constant temperature water bath control box 21 is connected with a water jacket layer 23 on the outer side of the reaction kettle through a refrigerating fluid circulating conduit 22. The water jacket 23 is internally provided with a loop spiral design, so that the cooling effect of the kettle body can be ensured, the temperature is ensured to be uniform, and the heat insulation layer formed by heat insulation cotton is designed, so that the temperature stability is ensured.
With continued reference to fig. 2, the pressure control module 3 includes a high-pressure gas cylinder 31, a booster pump 32, a buffer tank 33 and a pressure sensor 34, wherein one end of the booster pump 32 is connected to the high-pressure reaction kettle 1, and the other end is connected to the high-pressure gas cylinder 31; a gas buffer tank 33 is connected between the booster pump 32 and the high-pressure reaction device 1. The acoustic wave measurement module 4 comprises an acoustic wave parameter tester 41, an acoustic wave probe 42 and a communication data line, wherein the acoustic wave probe 42 is positioned at the upper end and the lower end of the inner cylinder 12 of the high-pressure reaction kettle, the acoustic wave probe ejector rod 16 is used for compressing a hydrate sample generated in the inner cylinder 12, and the acoustic wave parameter tester 41 is connected with the acoustic wave probe 42 through the communication data line. The main frequency of the acoustic wave probe is as follows: 500Hz to 5kHz, 5kHz is adopted in the embodiment.
In addition, the periphery of the high-pressure reaction kettle is provided with a lifting frame for mounting and dismounting the end cover 18 of the high-pressure reaction kettle and the generation inner cylinder 12; the lifting frame comprises a lifting frame 61 and a motor 62 positioned at the top of the supporting frame, and the reaction kettle end cover 18 and the inner barrel 12 are lifted through the work of the motor 62 in the experimental process.
When the experiment device is used for testing, the principle is as follows:
firstly, connecting and installing all the components of a low-frequency acoustic detection device: connecting the experimental device according to fig. 2, and preparing various articles required by the experiment, including an experimental medium, the acoustic wave probe 42, the acoustic wave probe ejector rod 16 and the lifting frame 61;
then, a tightness check is performed:
(1) before the experiment begins, the kettle cover bolt is opened, and the kettle cover 18 is taken down by using a matched electric hoisting frame 62;
(2) then, the inner generation inner tube 12 is slowly taken out by using the lifting frame 61 and the motor 62, the bottom acoustic wave probe 42 is installed at the bottom of the generation inner tube 12, and the sealing condition is checked;
(3) after the detection is correct, the generated inner cylinder 12 is placed back into the reaction kettle body 1;
the test experiment was started:
(1) injecting an experimental medium into the generating inner cylinder 12;
(2) placing the upper sound wave probe 42 at the upper end of the experimental medium, slightly compacting, and placing the sound wave probe ejector rod 16 on the sound wave probe 42 to ensure that the probe contacts the deposition medium;
(3) after the high-voltage resistant communication plug 15 is connected with the plate-through multi-core connector, closing the kettle cover 18 and screwing bolts in a diagonal sequence;
(4) opening temperature and pressure monitoring software, and starting to record temperature and pressure data;
(5) injecting methane gas of a desired pressure into the high-pressure reaction kettle 1;
(6) turning on a main power supply, starting the circulating water bath 21, and setting the temperature required by the experiment;
(7) starting the sound wave acquisition software 41, transmitting a signal through a sound wave vibration source, and starting to measure and record sound wave data;
(8) and after data acquisition is finished, importing the data into matched processing software for data processing.
According to the embodiment, the large-size hydrate simulation experiment device is developed in the laboratory, and the low-frequency sound wave emission frequency close to that of field reservoir detection is adopted, so that the fusion of the simulation experiment result in the laboratory and field detection data is closer, and the problem that the high-frequency ultrasonic detection and the field low-frequency detection result in the laboratory cannot be coupled is solved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (10)
1. Low frequency acoustics experimental apparatus to jumbo size hydrate deposit, including high pressure batch autoclave (1), temperature control module (2), pressure control module (3), sound wave measurement module (4) and data measurement and processing module (5), high pressure batch autoclave (1) bottom is equipped with drain (13) and fluid and imports and exports (14), its characterized in that:
the height of the high-pressure reaction kettle (1) is not less than 1000mm, and a temperature sensor (24), a pressure sensor (34) and a low-frequency sound wave probe (42) which are connected with the data measurement and processing module (5) are arranged on the kettle body of the high-pressure reaction kettle (1);
the sound wave measuring module (4) comprises a sound wave parameter tester (41) and a low-frequency sound wave probe (42), the sound wave parameter tester (41) is connected with the low-frequency sound wave probe (42) through a communication data line, and the low-frequency sound wave probe (42) is positioned at the upper end and the lower end of the inner generating cylinder (12).
2. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: and the low-frequency sound wave probe (42) is also provided with a sound wave probe ejector rod (16) which is used for compressing and generating a hydrate sample in the inner cylinder (12).
3. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: the high-pressure reaction kettle (1) comprises an outer cylinder (11) and a generation inner cylinder (12), wherein the side wall of the generation inner cylinder (12) is provided with a plurality of layers of sieve pores (17), and the inner wall of the generation inner cylinder (12) is paved with a waterproof breathable film.
4. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: the low-frequency sound wave probe (42) sends out a low-frequency signal with the sound wave frequency of 500Hz-5 kHz.
5. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: and a plurality of groups of temperature sensors (24) are uniformly arranged along the longitudinal direction of the high-pressure reaction kettle (1).
6. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: the outer side wall of the high-pressure reaction kettle (1) is provided with a water jacket layer (23) for controlling temperature, a loop spiral design is adopted in the water jacket layer (23), and a heat insulation layer is arranged on the outer side of the water jacket layer (23).
7. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 6, wherein: the temperature control module (2) comprises a constant-temperature water bath control box (21), a refrigerant liquid circulating conduit (22) and a water jacket layer (23) outside the reaction kettle; the constant-temperature water bath control box (21) is connected with the water jacket layer (23) through a refrigerating fluid circulating conduit (22).
8. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: the pressure control module (3) comprises a high-pressure gas cylinder (31), a booster pump (32), a buffer tank (33) and a pressure sensor (34), one end of the booster pump (32) is connected with the high-pressure reaction kettle (1), and the other end of the booster pump is connected with the high-pressure gas cylinder (31); the buffer tank (33) is connected between the booster pump (32) and the high-pressure reaction kettle (1).
9. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: the outer cylinder (11) of the high-pressure reaction kettle (1) is a high-pressure-resistant quick-opening reaction kettle, and the high-pressure reaction kettle (1) is quickly opened by adopting a nut type quick-opening structural design.
10. The low frequency acoustic experimental apparatus for large size hydrate deposits according to claim 1, wherein: the experimental device also comprises a movable lifting frame (61) and a motor (62), wherein the motor (62) is arranged on the lifting frame (61), and the high-pressure reaction kettle (1) is positioned below the lifting frame (61).
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| CN202122903818.2U CN216560402U (en) | 2021-11-25 | 2021-11-25 | Low-frequency acoustic experimental device for large-size hydrate sediments |
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| CN202122903818.2U CN216560402U (en) | 2021-11-25 | 2021-11-25 | Low-frequency acoustic experimental device for large-size hydrate sediments |
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