CN219608637U - Liquid nitrogen loading system - Google Patents
Liquid nitrogen loading system Download PDFInfo
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- CN219608637U CN219608637U CN202320631420.4U CN202320631420U CN219608637U CN 219608637 U CN219608637 U CN 219608637U CN 202320631420 U CN202320631420 U CN 202320631420U CN 219608637 U CN219608637 U CN 219608637U
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- liquid nitrogen
- electric cylinder
- piston rod
- nitrogen tank
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Abstract
The utility model discloses a liquid nitrogen loading system which comprises a bracket, a liquid nitrogen tank, a piston rod and an electric cylinder, wherein the bracket comprises a base, an electric cylinder mounting seat positioned above the base and a stand column connecting the base and the electric cylinder mounting seat, the liquid nitrogen tank is mounted on the base, a nitrogen injection port is arranged at the top of the liquid nitrogen tank, a nitrogen discharge port is arranged at the bottom of the liquid nitrogen tank, a nitrogen discharge valve is mounted on the nitrogen discharge port, the electric cylinder is mounted on the electric cylinder mounting seat, the piston rod is mounted at the output end of the electric cylinder, the end part of the piston rod can extend into the liquid nitrogen tank from the nitrogen injection port, a multistage sealing structure is arranged at the end part of the piston rod, and the sealing structure comprises an annular groove arranged on the outer wall of the piston rod and a sealing ring mounted in the annular groove. The liquid nitrogen tank adopts a double-layer structure, so that the heat preservation effect of liquid nitrogen is improved, the liquid nitrogen can be loaded to specified pressure through the electric cylinder driving piston rod, and meanwhile, the liquid nitrogen tank has higher conveying efficiency, so that the requirement of an ultralow-temperature fracturing simulation test is met.
Description
Technical Field
The utility model relates to the technical field of liquid nitrogen loading, in particular to a liquid nitrogen loading system which is used for loading liquid nitrogen in a liquid nitrogen fracturing simulation test.
Background
In the petroleum field, fracturing refers to a method for forming cracks in hydrocarbon reservoirs by utilizing the hydraulic action in the oil or gas extraction process, and is also called hydraulic fracturing. In recent years, with the improvement of the demand of unconventional reservoir fracturing, the liquid nitrogen fracturing technology becomes a research hotspot at home and abroad. In the process of carrying out the liquid nitrogen fracturing test, liquid nitrogen is firstly stored in a certain container, then ballasted to about 70MPa and finally conveyed into the rock for the test. At present, the existing liquid nitrogen loading system has poor heat preservation effect on liquid nitrogen, and the liquid nitrogen is easy to vaporize and cannot be loaded to specified pressure. There is a need for improvements in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a liquid nitrogen loading system which ensures that liquid nitrogen has a better heat preservation effect, can be loaded to a specified pressure and has higher conveying efficiency, so as to meet the requirements of ultralow-temperature fracturing simulation tests.
In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
the liquid nitrogen loading system comprises a support, a liquid nitrogen tank, a piston rod and an electric cylinder, wherein the support comprises a base, an electric cylinder mounting seat arranged above the base and an upright post connected with the base and the electric cylinder mounting seat, the liquid nitrogen tank is mounted on the base, a nitrogen injection port is arranged at the top of the liquid nitrogen tank, a nitrogen discharge port is arranged at the bottom of the liquid nitrogen tank, a nitrogen discharge valve is mounted on the nitrogen discharge port, the electric cylinder is mounted on the electric cylinder mounting seat, the piston rod is mounted at the output end of the electric cylinder, the end part of the piston rod can extend into the liquid nitrogen tank from the nitrogen injection port, a multistage sealing structure is arranged at the end part of the piston rod, and the sealing structure comprises an annular groove formed in the outer wall of the piston rod and a sealing ring mounted in the annular groove.
Preferably, the system further comprises a pressure sensor, wherein a pressure measuring port is arranged at the bottom of the liquid nitrogen tank, the pressure sensor is arranged at the bottom of the liquid nitrogen tank, and the detection end of the pressure sensor extends into the liquid nitrogen tank through the pressure measuring port.
Preferably, the liquid nitrogen tank comprises an inner container and a shell, a cavity is formed between the inner container and the shell, an extraction opening is formed in the side wall of the shell and communicated with the cavity, and an extraction valve is arranged on the extraction opening.
Preferably, the system further comprises a vacuum pump detachably connected to the suction valve.
Preferably, a limiting plate is arranged between the base and the electric cylinder mounting seat, a guide bearing is mounted on the limiting plate, and the piston rod penetrates through the guide bearing and can slide up and down along the guide bearing.
Compared with the prior art, the utility model has the beneficial effects that:
according to the liquid nitrogen loading system, the liquid nitrogen tank adopts a double-layer structure, so that the heat preservation effect of liquid nitrogen is improved, the piston rod is driven by the electric cylinder to load the liquid nitrogen to the specified pressure, and meanwhile, the liquid nitrogen loading system has higher conveying efficiency, so that the requirement of an ultralow-temperature fracturing simulation test is met. In addition, the system has simple structure, convenient use and high practicability.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of the present utility model.
Fig. 2 is a schematic view of the piston rod sealing structure of the present utility model.
In the figure: 1. a liquid nitrogen tank; 2. a piston rod; 3. an electric cylinder; 4. a pressure sensor; 5. a base; 6. a column; 7. a limiting plate; 8. an electric cylinder mounting seat; 9. a nitrogen injection port; 10. an extraction opening; 11. an annular groove.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Furthermore, in the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, a preferred embodiment of the present utility model provides a liquid nitrogen loading system comprising: the device comprises a bracket, a liquid nitrogen tank 1, a piston rod 2, an electric cylinder 3, a pressure sensor 4 and a vacuum pump (not shown in the figure).
Wherein, the support is the metal material, including base 5, stand 6, limiting plate 7 and electric jar mount pad 8, and electric jar mount pad 8 is located the top of base 5, passes through stand 6 fixed connection between base 5 and the electric jar mount pad 8, and specifically, stand 6 is four, is square arrangement. Limiting plates 7 are fixedly arranged on the four upright posts 6, the limiting plates 7 are located in the middle of the base 5 and the electric cylinder mounting seat 8, and guide bearings are fixedly arranged in the center of the limiting plates 7.
The liquid nitrogen tank 1 is used for storing liquid nitrogen, the liquid nitrogen tank 1 is fixedly arranged on the base 5, a nitrogen injection port 9 is arranged at the top of the liquid nitrogen tank 1, and the liquid nitrogen is injected into the liquid nitrogen tank 1 through the nitrogen injection port 9. The bottom of the liquid nitrogen tank 1 is provided with a nitrogen discharging port, a nitrogen discharging valve is arranged on the nitrogen discharging port and is connected with a nitrogen conveying pipeline, and liquid nitrogen is conveyed into the test rock through the nitrogen conveying pipeline. The bottom of the liquid nitrogen tank 1 is also provided with a side pressure port, the pressure sensor 4 is arranged at the bottom of the liquid nitrogen tank 1, and the detection end of the pressure sensor 4 extends into the liquid nitrogen tank 1 through the pressure measurement port and is used for detecting the pressure value in the liquid nitrogen tank 1 in real time.
In order to improve the heat preservation effect of the liquid nitrogen tank 1 on liquid nitrogen, the liquid nitrogen tank 1 adopts a double-layer structure, and specifically comprises an inner container and a shell, a cavity is formed between the inner container and the shell, an extraction opening 10 is arranged on the side wall of the shell, the extraction opening 10 is communicated with the cavity, and an extraction valve is arranged on the extraction opening 10. The air extraction end of the vacuum pump is detachably connected with the air extraction valve, and the vacuum pump can be used for vacuumizing the cavity in the liquid nitrogen tank 1, so that the heat preservation effect of the liquid nitrogen tank 1 is improved.
The electric cylinder 3 is fixedly installed on the electric cylinder installation seat 8, and the output end of the electric cylinder 3 passes through the electric cylinder installation seat 8 and is downwards arranged, and it is to be noted that the electric cylinder 3 is in the prior art, and the working principle of the electric cylinder 3 is referred to in the prior art and is not described herein.
The piston rod 2 is fixedly arranged at the output end of the electric cylinder 3, the piston rod 2 penetrates through a guide bearing, the piston rod 2 can slide up and down along the guide bearing under the driving of the electric cylinder 3, and the end part of the piston rod 2 can extend into the liquid nitrogen tank 1 from the nitrogen injection port 9.
As shown in fig. 2, a multi-stage sealing structure is provided at the end of the piston rod 2 to ensure that liquid nitrogen does not overflow from the nitrogen inlet 9 during the downward ballasting of the piston rod 2. The utility model is provided with a two-stage sealing structure, in particular to the sealing structure which comprises an annular groove 11 arranged on the outer wall of a piston rod 2 and a sealing ring (not shown in the figure) arranged in the annular groove 11, wherein the sealing ring is tightly contacted with the inner wall of the liquid nitrogen tank 1 in the process that the piston rod 2 moves up and down in the liquid nitrogen tank 1, so that the sealing effect is realized.
The use process of the utility model is described:
firstly, connecting a vacuumizing pump with an air extraction valve, opening the air extraction valve, starting the vacuumizing pump to vacuumize, firstly closing the air extraction valve after vacuuming is finished, and then closing the vacuumizing pump.
Liquid nitrogen is poured into the liquid nitrogen tank 1 from the nitrogen injection port 9, then the electric cylinder 3 is started rapidly, and the piston rod 2 is driven to move downwards to load the liquid nitrogen. The pressure value of the liquid nitrogen in the liquid nitrogen tank 1 is observed through the pressure sensor 4, the liquid nitrogen is delivered into the test rock after the liquid nitrogen is loaded to a specified pressure, such as 70MPa, and a nitrogen unloading valve is opened.
In summary, in the liquid nitrogen loading system provided by the embodiment of the utility model, the liquid nitrogen tank adopts a double-layer structure, so that the heat preservation effect of liquid nitrogen is improved, the liquid nitrogen can be loaded to a specified pressure by driving the piston rod through the electric cylinder, and meanwhile, the liquid nitrogen loading system has higher conveying efficiency, so that the requirement of ultra-low temperature fracturing simulation test is met. In addition, the system has simple structure, convenient use and high practicability.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (5)
1. The liquid nitrogen loading system is characterized by comprising a support, a liquid nitrogen tank, a piston rod and an electric cylinder, wherein the support comprises a base, an electric cylinder mounting seat arranged above the base and an upright post connected with the base and the electric cylinder mounting seat, the liquid nitrogen tank is mounted on the base, a nitrogen injection port is arranged at the top of the liquid nitrogen tank, a nitrogen discharge port is arranged at the bottom of the liquid nitrogen tank, a nitrogen discharge valve is mounted on the nitrogen discharge port, the electric cylinder is mounted on the electric cylinder mounting seat, the piston rod is mounted at the output end of the electric cylinder, the end part of the piston rod can extend into the liquid nitrogen tank from the nitrogen injection port, a multistage sealing structure is arranged at the end part of the piston rod, and the sealing structure comprises an annular groove formed in the outer wall of the piston rod and a sealing ring mounted in the annular groove.
2. The liquid nitrogen loading system according to claim 1, further comprising a pressure sensor, wherein a pressure measuring port is provided at the bottom of the liquid nitrogen tank, the pressure sensor is installed at the bottom of the liquid nitrogen tank, and a detection end of the pressure sensor extends into the liquid nitrogen tank through the pressure measuring port.
3. The liquid nitrogen loading system of claim 1, wherein the liquid nitrogen tank comprises a liner and a shell, a cavity is formed between the liner and the shell, an extraction opening is formed in the side wall of the shell, the extraction opening is communicated with the cavity, and an extraction valve is installed on the extraction opening.
4. A liquid nitrogen loading system according to claim 3 further comprising a vacuum pump detachably connected to the suction valve.
5. The liquid nitrogen loading system according to claim 1, wherein a limiting plate is arranged between the base and the electric cylinder mounting seat, a guide bearing is mounted on the limiting plate, and the piston rod penetrates through the guide bearing and can slide up and down along the guide bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320631420.4U CN219608637U (en) | 2023-03-28 | 2023-03-28 | Liquid nitrogen loading system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320631420.4U CN219608637U (en) | 2023-03-28 | 2023-03-28 | Liquid nitrogen loading system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219608637U true CN219608637U (en) | 2023-08-29 |
Family
ID=87753156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320631420.4U Active CN219608637U (en) | 2023-03-28 | 2023-03-28 | Liquid nitrogen loading system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219608637U (en) |
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2023
- 2023-03-28 CN CN202320631420.4U patent/CN219608637U/en active Active
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