CN219608637U - Liquid Nitrogen Loading System - Google Patents

Liquid Nitrogen Loading System Download PDF

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Publication number
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
base
tank
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王胜清
孟祥旭
殷鹏飞
刘彦民
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Qingdao Qiankunxing Intelligent Technology Co ltd
China University of Petroleum East China
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Qingdao Qiankunxing Intelligent Technology Co ltd
China University of Petroleum East China
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Abstract

本实用新型公开了一种液氮加载系统,包括支架、液氮罐、活塞杆和电缸,所述支架包括底座、位于底座上方的电缸安装座以及连接底座和电缸安装座的立柱,所述液氮罐安装在底座上,在液氮罐的顶部设有注氮口,底部设有卸氮口,在卸氮口上安装有卸氮阀门,所述电缸安装在电缸安装座上,所述活塞杆安装在电缸的输出端,且活塞杆的端部能够从注氮口伸入液氮罐内部,在活塞杆的端部设有多级密封结构,所述密封结构包括设在活塞杆外壁的环形凹槽以及安装在环形凹槽里的密封圈。液氮罐采用双层结构,提升了液氮的保温效果,通过电缸驱动活塞杆能够对液氮能够加载至指定压力,同时具有较高的输送效率,以满足超低温压裂模拟试验要求。

The utility model discloses a liquid nitrogen loading system, which comprises a support, a liquid nitrogen tank, a piston rod and an electric cylinder. The support includes a base, an electric cylinder mounting seat located above the base, and a column connecting the base and the electric cylinder mounting seat. The liquid nitrogen tank is installed on the base, a nitrogen injection port is provided on the top of the liquid nitrogen tank, a nitrogen discharge port is provided at the bottom, a nitrogen discharge valve is installed on the nitrogen discharge port, and the electric cylinder is installed on the electric cylinder mounting seat , the piston rod is installed on the output end of the electric cylinder, and the end of the piston rod can extend into the liquid nitrogen tank from the nitrogen injection port, and a multi-stage sealing structure is provided at the end of the piston rod, and the sealing structure includes An annular groove on the outer wall of the piston rod and a sealing ring installed in the annular groove. The liquid nitrogen tank adopts a double-layer structure, which improves the heat preservation effect of the liquid nitrogen. The piston rod driven by the electric cylinder can load the liquid nitrogen to a specified pressure, and has a high delivery efficiency to meet the requirements of the ultra-low temperature fracturing simulation test.

Description

液氮加载系统Liquid Nitrogen Loading System

技术领域technical field

本实用新型涉及液氮加载技术领域,具体而言,涉及一种液氮加载系统,用于在液氮压裂模拟试验中加载液氮。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 liquid nitrogen fracturing simulation tests.

背景技术Background technique

在石油领域,压裂是指采油或采气过程中,利用水力作用,使油气层形成裂缝的一种方法,又称水力压裂。近年来,随着非常规储层压裂改造需求的提升,液氮压裂技术成为国内外研究热点。进行液氮压裂试验过程中,首先将液氮存储在一定容器里,然后压载至70MPa左右,最后输送至用于试验的岩石中。目前,现有的液氮加载系统对液氮的保温效果差,液氮容易汽化,无法加载至指定压力。对此,有必要对现有技术进行改进。In the field of petroleum, fracturing refers to a method that uses hydraulic action to form cracks in oil and gas layers during the process of oil or gas recovery, also known as hydraulic fracturing. In recent years, with the increasing demand for fracturing in unconventional reservoirs, liquid nitrogen fracturing technology has become a research hotspot at home and abroad. During the liquid nitrogen fracturing test, the liquid nitrogen is first stored in a certain container, then ballasted to about 70MPa, and finally transported to the rock for the test. At present, the existing liquid nitrogen loading system has poor insulation effect on liquid nitrogen, and liquid nitrogen is easy to vaporize, so it cannot be loaded to the specified pressure. For this, it is necessary to improve the prior art.

实用新型内容Utility model content

针对上述现有技术的不足,本实用新型的目的在于提供一种液氮加载系统,保证液氮具有较佳的保温效果、对液氮能够加载至指定压力以及较高的输送效率,以满足超低温压裂模拟试验要求。In view of the deficiencies of the above-mentioned prior art, the purpose of this utility model is to provide a liquid nitrogen loading system, which ensures that liquid nitrogen has a better heat preservation effect, can load liquid nitrogen to a specified pressure and has a higher delivery efficiency, so as to meet the needs of ultra-low temperature Fracturing simulation test requirements.

为实现上述目的,本实用新型采用的技术解决方案是:For realizing above-mentioned object, the technical solution that the utility model adopts is:

液氮加载系统,包括支架、液氮罐、活塞杆和电缸,所述支架包括底座、位于底座上方的电缸安装座以及连接底座和电缸安装座的立柱,所述液氮罐安装在底座上,在液氮罐的顶部设有注氮口,底部设有卸氮口,在卸氮口上安装有卸氮阀门,所述电缸安装在电缸安装座上,所述活塞杆安装在电缸的输出端,且活塞杆的端部能够从注氮口伸入液氮罐内部,在活塞杆的端部设有多级密封结构,所述密封结构包括设在活塞杆外壁的环形凹槽以及安装在环形凹槽里的密封圈。The liquid nitrogen loading system includes a bracket, a liquid nitrogen tank, a piston rod and an electric cylinder. The bracket includes a base, an electric cylinder mount above the base, and a column connecting the base and the electric cylinder mount. The liquid nitrogen tank is installed on On the base, a nitrogen injection port is provided on the top of the liquid nitrogen tank, a nitrogen discharge port is provided at the bottom, a nitrogen discharge valve is installed on the nitrogen discharge port, the electric cylinder is installed on the electric cylinder mounting seat, and the piston rod is installed on the The output end of the electric cylinder, and the end of the piston rod can extend into the liquid nitrogen tank from the nitrogen injection port, and a multi-stage sealing structure is provided at the end of the piston rod. Groove and sealing ring installed in the annular groove.

优选地,该系统还包括压力传感器,在液氮罐的底部设有测压口,所述压力传感器安装在液氮罐的底部,且压力传感器的检测端通过测压口伸进液氮罐的内部。Preferably, the system also includes a pressure sensor, 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 the detection end of the pressure sensor extends into the liquid nitrogen tank through the pressure measuring port internal.

优选地,所述液氮罐包括内胆和外壳,内胆和外壳之间形成一个腔体,在外壳的侧壁设有抽气口,抽气口与腔体连通,在抽气口上安装有抽气阀门。Preferably, the liquid nitrogen tank includes an inner tank and an outer shell, a cavity is formed between the inner tank and the outer shell, an air extraction port is provided on the side wall of the outer shell, the air extraction port communicates with the cavity, and an air extraction port is installed on the air extraction port. valve.

优选地,该系统还包括抽真空泵,抽真空泵与抽气阀门可拆卸连接。Preferably, the system further includes a vacuum pump, which is detachably connected to the air valve.

优选地,底座和电缸安装座之间设有限位板,限位板上安装有导向轴承,所述活塞杆穿过导向轴承,且能够沿着导向轴承上下滑动。Preferably, a limit plate is provided between the base and the electric cylinder installation seat, and a guide bearing is installed on the limit plate, and the piston rod passes through the guide bearing and can slide up and down along the guide bearing.

与现有技术相比本实用新型具有的有益效果:Compared with the prior art, the utility model has the beneficial effects:

本实用新型一种液氮加载系统,液氮罐采用双层结构,提升了液氮的保温效果,通过电缸驱动活塞杆能够对液氮能够加载至指定压力,同时具有较高的输送效率,以满足超低温压裂模拟试验要求。另外,该系统结构简单,使用便捷,实用性高。The utility model relates to a liquid nitrogen loading system. The liquid nitrogen tank adopts a double-layer structure, which improves the heat preservation effect of the liquid nitrogen. The piston rod driven by the electric cylinder can load the liquid nitrogen to a specified pressure, and at the same time, it has a high delivery efficiency. To meet the requirements of ultra-low temperature fracturing simulation test. In addition, the system has simple structure, convenient use and high practicability.

附图说明Description of drawings

为了更清楚地说明本实用新型技术方案,下面将对实施方式中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本实用新型的一些实施方式,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to illustrate the technical solution of the utility model more clearly, the accompanying drawings used in the implementation will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the utility model. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

图1是本实用新型整体结构示意图。Fig. 1 is a schematic diagram of the overall structure of the utility model.

图2是本实用新型活塞杆密封结构示意图。Fig. 2 is a schematic diagram of the sealing structure of the piston rod of the present invention.

图中:1、液氮罐;2、活塞杆;3、电缸;4、压力传感器;5、底座;6、立柱;7、限位板;8、电缸安装座;9、注氮口;10、抽气口;11、环形凹槽。In the figure: 1. Liquid nitrogen tank; 2. Piston rod; 3. Electric cylinder; 4. Pressure sensor; 5. Base; 6. Column; 7. Limiting plate; 8. Electric cylinder mounting seat; 9. Nitrogen injection port ; 10, air extraction port; 11, annular groove.

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

此外,在本实用新型的描述中,需要说明的是,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或一体地连接;可以是机械连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通。对于本领域的普通技术人员而言,可以具体情况理解上述术语在本实用新型中的具体含义。In addition, in the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed The connection can also be a detachable connection or an integral connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

如图1所示,本实用新型优选的实施例提供了一种液氮加载系统,包括:支架、液氮罐1、活塞杆2、电缸3、压力传感器4和抽真空泵(图中未示出)。As shown in Figure 1, a preferred embodiment of the present utility model provides a liquid nitrogen loading system, including: 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 out).

其中,支架为金属材质,包括底座5、立柱6、限位板7和电缸安装座8,电缸安装座8位于底座5的上方,底座5和电缸安装座8之间通过立柱6固定连接,具体的,立柱6有四个,呈方形布置。限位板7固定安装在四个立柱6上,且限位板7位于底座5和电缸安装座8的中间位置,在限位板7的中心位置固定安装有导向轴承。Among them, the bracket is made of metal material, including base 5, column 6, limit plate 7 and electric cylinder mounting seat 8, electric cylinder mounting seat 8 is located above the base 5, and the base 5 and electric cylinder mounting seat 8 are fixed by column 6 Connection, specifically, there are four columns 6 arranged in a square shape. The limiting plate 7 is fixedly installed on the four columns 6, and the limiting plate 7 is located in the middle of the base 5 and the electric cylinder mounting base 8, and a guide bearing is fixedly installed in the center of the limiting plate 7.

液氮罐1用于储存液氮,液氮罐1固定安装在底座5上,在液氮罐1的顶部设有注氮口9,液氮通过注氮口9注入液氮罐1里。在液氮罐1的底部设有卸氮口,在卸氮口上安装有卸氮阀门,卸氮阀门连接有输氮管路,液氮通过输氮管路输送至试验岩石中。在液氮罐1的底部还设有侧压口,压力传感器4安装在液氮罐1的底部,且压力传感器4的检测端通过测压口伸进液氮罐1的内部,用于实时检测液氮罐1内的压力值。The liquid nitrogen tank 1 is used to store liquid nitrogen, and the liquid nitrogen tank 1 is fixedly installed on the base 5 . The top of the liquid nitrogen tank 1 is provided with a nitrogen injection port 9 , and liquid nitrogen is injected into the liquid nitrogen tank 1 through the nitrogen injection port 9 . A nitrogen unloading port is provided at the bottom of the liquid nitrogen tank 1, and a nitrogen unloading valve is installed on the nitrogen unloading port. The nitrogen unloading valve is connected with a nitrogen pipeline, and the liquid nitrogen is transported to the test rock through the nitrogen pipeline. There is also a side pressure port at the bottom of the liquid nitrogen tank 1, the pressure sensor 4 is installed at the bottom of the liquid nitrogen tank 1, and the detection end of the pressure sensor 4 extends into the inside of the liquid nitrogen tank 1 through the pressure measuring port for real-time detection The pressure value in the liquid nitrogen tank 1.

为了提升液氮罐1对液氮的保温效果,液氮罐1采用双层结构,具体的,包括内胆和外壳,内胆和外壳之间形成一个腔体,在外壳的侧壁设有抽气口10,抽气口10与腔体连通,在抽气口10上安装有抽气阀门。抽真空泵的抽气端与抽气阀门可拆卸连接,通过抽真空泵能够实现对液氮罐1内的腔体抽真空,进而提升液氮罐1的保温效果。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, specifically, it includes an inner tank and an outer shell, a cavity is formed between the inner tank and the outer shell, and a pump is provided on the side wall of the outer shell. Air port 10, the air extraction port 10 is communicated with the cavity, and an air extraction valve is installed on the air extraction port 10. The pumping end of the vacuum pump is detachably connected to the pumping valve, and the cavity in the liquid nitrogen tank 1 can be vacuumed through the vacuum pump, thereby improving the heat preservation effect of the liquid nitrogen tank 1 .

电缸3固定安装在电缸安装座8上,且电缸3的输出端穿过电缸安装座8朝下设置,需要说明的是电缸3为现有技术,其工作原理参照现有技术,在此不再赘述。The electric cylinder 3 is fixedly installed on the electric cylinder mounting seat 8, and the output end of the electric cylinder 3 is set downward through the electric cylinder mounting seat 8. It should be noted that the electric cylinder 3 is a prior art, and its working principle refers to the prior art , which will not be repeated here.

活塞杆2固定安装在电缸3的输出端,且活塞杆2穿过导向轴承,在电缸3的驱动下活塞杆2能够沿着导向轴承上下滑动,且活塞杆2的端部能够从注氮口9伸入液氮罐1内部。The piston rod 2 is fixedly installed on the output end of the electric cylinder 3, and the piston rod 2 passes through the guide bearing. Driven by the electric cylinder 3, the piston rod 2 can slide up and down along the guide bearing, and the end of the piston rod 2 can slide from the injection The nitrogen port 9 extends into the liquid nitrogen tank 1 inside.

如图2所示,在活塞杆2的端部设有多级密封结构,以保证活塞杆2在向下压载液氮过程中液氮不会从注氮口9溢出。本实用新型设有两级密封结构,具体的,密封结构包括设在活塞杆2外壁的环形凹槽11以及安装在环形凹槽11里的密封圈(图中未示出),活塞杆2在液氮罐1内部上下移动过程中,密封圈与液氮罐1的内壁紧密接触,进而实现密封的效果。As shown in FIG. 2 , a multi-stage sealing structure is provided at the end of the piston rod 2 to ensure that the liquid nitrogen will not overflow from the nitrogen injection port 9 when the piston rod 2 is ballasting liquid nitrogen downward. The utility model is provided with a two-stage sealing structure. Specifically, the sealing structure includes an annular groove 11 arranged on the outer wall of the piston rod 2 and a sealing ring (not shown) installed in the annular groove 11. The piston rod 2 During the up and down movement of the inside of the liquid nitrogen tank 1, the sealing ring is in close contact with the inner wall of the liquid nitrogen tank 1, thereby realizing the effect of sealing.

对本实用新型的使用过程进行说明:The use process of the present utility model is described:

首先将抽真空泵与抽气阀门连接,打开抽气阀门,启动抽真空泵进行抽真空,抽真空完毕后先关闭抽气阀门,然后在关闭抽真空泵。First connect the vacuum pump to the exhaust valve, open the exhaust valve, start the vacuum pump for vacuuming, close the exhaust valve after the vacuum is completed, and then turn off the vacuum pump.

将液氮从注氮口9倒入液氮罐1中,然后迅速启动电缸3,并驱动活塞杆2向下移动加载液氮。通过压力传感器4观察液氮罐1中液氮的压力值,待加载至指定压力,比如70MPa,打开卸氮阀门,将液氮输送至试验岩石中。Pour liquid nitrogen into the liquid nitrogen tank 1 from the nitrogen injection port 9, then quickly start the electric cylinder 3, and drive the piston rod 2 to move downward 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, and when it is loaded to a specified pressure, such as 70MPa, the nitrogen unloading valve is opened to transport the liquid nitrogen to the test rock.

综上所述,本实用新型实施例所述的液氮加载系统,液氮罐采用双层结构,提升了液氮的保温效果,通过电缸驱动活塞杆能够对液氮能够加载至指定压力,同时具有较高的输送效率,以满足超低温压裂模拟试验要求。另外,该系统结构简单,使用便捷,实用性高。In summary, in the liquid nitrogen loading system described in the embodiment of the utility model, the liquid nitrogen tank adopts a double-layer structure, which improves the heat preservation effect of the liquid nitrogen, and the piston rod driven by the electric cylinder can load the liquid nitrogen to a specified pressure. At the same time, it has high delivery efficiency to meet the requirements of ultra-low temperature fracturing simulation tests. In addition, the system has simple structure, convenient use and high practicability.

最后应说明的是:以上实施例仅用以说明本实用新型的技术方案,而非对其限制;尽管参照前述实施例对本实用新型进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本实用新型各实施例技术方案的精神和范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present utility model. and range.

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.
CN202320631420.4U 2023-03-28 2023-03-28 Liquid Nitrogen Loading System Active CN219608637U (en)

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CN202320631420.4U CN219608637U (en) 2023-03-28 2023-03-28 Liquid Nitrogen Loading System

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