Emptying-free anti-freezing and anti-blocking sampling valve

Abstract

The invention provides an emptying-free anti-freezing and anti-blocking sampling valve which comprises a valve body, a drainage tube, a hexagonal internal thread short section, a valve rod, a valve element and a valve seat. The tail end of the valve body is connected to the hexagonal internal thread nipple; the drainage tube is installed on the valve body, the valve element and the valve rod are integrally installed in the valve body after being connected, and the valve element is directly communicated with the tail end of the valve body. When the valve is opened, the valve rod and the valve element move backwards, and crude oil in a pipeline enters the valve body and flows out through the drainage pipe; when the valve is closed, the valve element moves forwards, crude oil in the valve body and the hexagonal internal thread short section is pushed into a pipeline, no liquid exists in the sampling valve, and the emptying-free anti-freezing and anti-blocking effects are achieved; according to the sampling valve disclosed by the invention, a mounting short section which causes a dead oil area is removed, and the tail end of the sampling valve body is mounted in a pipeline by using an internal thread structure, so that the up-and-down movement of a valve core of the original sampling valve is changed into the current front-and-back movement, the formation of the dead oil area is avoided, the problems existing in emptying sampling and sampling after freezing and blocking are solved, and the purposes of emptying-free and freezing and blocking-free are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil extraction, and relates to a sampling valve that is free of venting and anti-freezing blockage. Background Art

[0002] During the oil extraction process, sampling of pumping wells is a routine task in oil production management and an important link in the accuracy of basic well data. By analyzing the oil samples, the oil and water content in the well can be understood, and the changes in the liquid production and oil production of the well can be accurately grasped. Currently, the sampling devices for pumping wells used on-site mainly involve welding an external thread nipple on the Christmas tree of the oil well, connecting a sampling valve with an internal thread structure to the Christmas tree through threads, and connecting an external thread elbow to the outlet of the sampling valve for convenient sampling. When sampling, the sampling valve is opened for venting operation. Only after the dead oil in the sampling valve is drained can a qualified crude oil sample be obtained. The disadvantages of this process are that a "dead oil" area is formed between the external thread nipple of the sampling valve and the valve core of the sampling valve. During the venting operation, crude oil loss will occur, crude oil leakage will occur, and the environment will be polluted; if the dead oil in the sampling valve is not drained completely, the obtained crude oil sample will be unqualified, and the well data analyzed later cannot be used; as the temperature drops, the liquid in the "dead oil" area is extremely likely to condense and freeze, making the sampling process difficult. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a sampling valve that is free of venting and anti-freezing blockage, fundamentally solving the problems existing in venting sampling and sampling after freezing blockage, and achieving the purpose of being free of venting and anti-freezing blockage.

[0004] The present invention is realized through the following technical solutions:

[0005] A sampling valve that is free of venting and anti-freezing blockage, comprising,

[0006] a valve body, a drainage pipe, a hexagon internal thread nipple, a valve stem, a valve core, and a valve seat;

[0007] The end of the valve body is connected to the hexagon internal thread nipple; the drainage pipe is installed on the valve body, the valve core is integrally installed in the valve body after being connected to the valve stem, and the valve core is directly connected to the end of the valve body; the valve seat is arranged in the valve body and is used for cooperating with the valve core for sealing;

[0008] The gland is sleeved on the valve stem, and the gland nut is installed at the upper end of the valve body for pressing the gland;

[0009] When the valve is opened, the valve stem and the valve core move backward, and the crude oil in the pipeline enters the valve body and flows out through the drainage pipe;

[0010] When the valve is closed, the valve core moves forward, pushing the crude oil in the valve body and the hexagon internal thread nipple into the pipeline, so that there is no liquid in the sampling valve.

[0011] Preferably, a sampling hole is provided on the valve body for connecting a drainage pipe.

[0012] Preferably, a handwheel is provided at the upper end of the valve stem, and the handwheel is fixed to the upper end of the valve stem with a nut.

[0013] Preferably, one end of the nipple is welded inside the production tree pipeline of the pumping well.

[0014] Preferably, external threads are respectively provided at both ends of the valve body. One end of the thread is used to connect the gland nut, and the other end of the thread is used to connect the hexagon female nipple.

[0015] Preferably, a gasket is provided at the bottom of the gland.

[0016] Preferably, the gland nut is threadedly connected to the valve body.

[0017] Preferably, the end of the valve body is threadedly connected to the hexagon female nipple.

[0018] Preferably, the gland nut has a hexagon internal thread structure.

[0019] Preferably, a gasket is provided inside the valve seat.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The present invention provides a sampling valve that is free of venting and anti-freezing and plugging, including a valve body, a drainage pipe, a hexagon female nipple, a valve stem, a valve core, and a valve seat; the end of the valve body is connected to the hexagon female nipple; the drainage pipe is installed on the valve body, and after the valve core is connected to the valve stem, they are integrally installed inside the valve body, and the valve core is directly connected to the end of the valve body; the valve seat is arranged inside the valve body for cooperating with the valve core for sealing; the gland is sleeved on the valve stem, and the gland nut is installed at the upper end of the valve body for pressing the gland; when the valve is opened, the valve stem and the valve core move backward, and the crude oil in the pipeline enters the valve body and flows out through the drainage pipe; when the valve is closed, the valve core moves forward, pushing the crude oil inside the valve body and the hexagon female nipple into the pipeline, so that there is no liquid in the sampling valve, achieving the effect of being free of venting and anti-freezing and plugging; the sampling valve that is free of venting and anti-freezing and plugging of the present invention removes the installation nipple that causes the "dead oil" area, and installs the end of the sampling valve body inside the pipeline with an internal thread structure, changing the up and down movement of the original sampling valve core to the current forward and backward movement, avoiding the formation of the "dead oil" area, fundamentally solving the problems existing in venting sampling and sampling after freezing and plugging, and achieving the purpose of being free of venting and anti-freezing and plugging.

[0022] Furthermore, for the sampling valve that is free of venting and anti-freezing and plugging of the present invention, the single sampling time is reduced from 10 minutes before to 2 minutes after use, saving 5 times, reducing the workload of personnel, improving work efficiency, reducing crude oil loss, and improving the water cut accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of a sampling valve for anti-freezing and anti-blocking without emptying in the present invention.

[0024] Figure 2 It is a schematic sectional structure diagram of a sampling valve for anti-freezing and anti-blocking without emptying in the present invention.

[0025] In the figure: 1. Handwheel; 2. Compression cap; 3. Valve body; 4. Drainage pipe; 5. Hexagon internal thread short section; 6. Gland; 7. Valve stem; 8. Valve core; 9. Valve seat. Specific embodiments

[0026] The following will further elaborate on the present invention in detail with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0027] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Below in the specific embodiments, a technical solution of a sampling valve for anti-freezing and anti-blocking without emptying provided by the embodiments of the present invention will be introduced and described in detail through several specific embodiments.

[0029] Referring to Figure 1 and Figure 2 As shown, a sampling valve for anti-freezing and anti-blocking without emptying includes a handwheel 1. A gasket is provided on the top of the handwheel 1, and a nut is connected above the gasket to compress the gasket; a compression cap 2, which has a hexagonal internal thread structure and is connected to the valve body 3 for compressing the gland 6; a valve body 3, which has external threads at the front and back and a hexagonal square in the middle. The front thread is used to connect the compression cap 2, the rear thread is used to connect the hexagon internal thread short joint 5, and an internal thread is provided below the middle hexagonal square for connecting the drainage pipe 4 and also facilitating the installation with a wrench; a drainage pipe 4, which is a hollow pipe with an external thread at one end for connecting to the valve body 3; a hexagon internal thread short joint 5, with one end horizontally welded to the pipeline and the other end for connecting to the valve body 3; a gland 6, which is sleeved on the valve stem 7, and a sealing gasket is provided below the gland 6. The compression cap 2 compresses the gland 6, and the gland 6 compresses the sealing gasket; a valve stem 7, with a square column and an external thread at the upper end for installation and fastening of the handwheel 1, an external thread in the middle for mating with the internal thread inside the valve body, and the rear end connected to the valve core 8; a valve core 8, which is in a needle shape and is connected to the valve stem 7 for mating with the valve seat 9; a valve seat 9, which is arranged inside the valve body 3 and is internally provided with a sealing gasket for mating with the valve core 8.

[0030] The working principle of the present invention is as follows: One end of the hexagon female thread short joint is welded inside the production tree pipeline of the pumping well. The end of the valve body is connected to the hexagon female thread short joint through threads. A sampling hole is opened at the lower part of the valve body to connect the drainage pipe. The valve core and the valve stem are integrally installed inside the valve body, and the valve core is directly connected to the end of the valve body. The gland is sleeved on the valve stem to compress the sealing gasket, and the gland nut is installed at the upper end of the valve body through threads to compress the gland. A handwheel is arranged at the upper part of the valve stem, and the handwheel is fixed to the upper part of the valve stem with a nut. By rotating the handwheel counterclockwise, the valve is opened, and the valve stem and the valve core move backward. The crude oil in the pipeline enters the valve body, reaches the sampling hole and then flows out through the drainage pipe. After sampling, rotate the handwheel clockwise to close the valve. When the valve is closed, the valve core moves forward, pushing all the crude oil in the valve body and the hexagon female thread short joint into the pipeline, so that there is no liquid in the sampling valve and the hexagon female thread short joint, achieving the function of avoiding emptying and preventing freezing and blocking.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention, and all of them are within the protection scope of this technology.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0034] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] The technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] As mentioned above, it is only the preferred embodiment of the present invention, and there is no any form of limitation to the present invention. Any person skilled in the art can smoothly implement the present invention according to the description shown in the accompanying drawings of the specification and the above description. However, any equivalent changes such as slight modifications, refinements and evolutions made by those skilled in the art without departing from the technical solutions of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essence of the present invention still fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A sampling valve that prevents freezing and blockage without venting, characterized in that, including, a valve body (3), a drain pipe (4), a hexagon female thread nipple (5), a valve stem (7), a valve core (8) and a valve seat (9); the end of the valve body (3) is connected to the hexagon female thread nipple (5); the drain pipe (4) is installed on the valve body (3), the valve core (8) is connected to the valve stem (7) and then integrally installed in the valve body (3), and the valve core (8) is directly connected to the end of the valve body (3); the valve seat (9) is arranged in the valve body (3) for cooperating with the valve core (8) for sealing; the gland (6) is sleeved on the valve stem (7), and the gland nut (2) is installed at the upper end of the valve body (3) for pressing the gland (6); when the valve is opened, the valve stem (7) and the valve core (8) move backward, and the crude oil in the pipeline enters the valve body (3) and flows out through the drain pipe (4); when the valve is closed, the valve core (8) moves forward, pushing the crude oil in the valve body (3) and the hexagon female thread nipple (5) into the pipeline, so that there is no liquid in the sampling valve.

2. The anti-freezing and anti-blocking sampling valve without emptying according to claim 1, wherein a sampling hole is formed in the valve body (3) for connecting the drain pipe (4).

3. The anti-freezing and anti-blocking sampling valve without emptying according to claim 1, characterized in that, a handwheel (1) is arranged at the upper end of the valve stem (7), and the handwheel (1) is fixed to the upper end of the valve stem (7) with a nut.

4. The anti-freezing and anti-blocking sampling valve without emptying according to claim 1, characterized in that, one end of the nipple (5) is welded in the production tree pipeline of the pumping well.

5. The sampling valve for preventing air release and freezing blockage according to claim 1, characterized in that, external threads are respectively arranged at both ends of the valve body (3), one end of the thread is used for connecting the gland nut (2), and the other end of the thread is used for connecting the hexagon female thread nipple (5).

6. The anti-freezing and anti-blocking sampling valve without emptying according to claim 1, wherein a sealing gasket is arranged at the bottom of the gland (6).

7. A sampling valve for preventing freezing and blockage without emptying according to claim 1, characterized in that, the gland nut (2) is threadedly connected to the valve body (3).

8. The anti-freezing and anti-blocking sampling valve without emptying according to claim 1, wherein the end of the valve body (3) is threadedly connected to the hexagon female thread nipple (5).

9. The anti-freezing and anti-blocking sampling valve without venting according to claim 1, wherein, the gland nut (2) is of a hexagon internal thread structure.

10. The anti-freezing and anti-blocking sampling valve without emptying according to claim 1, characterized in that, a sealing gasket is arranged in the valve seat (9).

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