Gas sampling device for oil-gas mixed transportation pipeline

By designing an oil and gas mixed pipeline gas sampling device including transparent sampling barrel, piston and base, the problem of complex and impure gas sampling operations in offshore oil and gas mining is solved, and the sampling effect of light and easy operation and pure gas sample is achieved .

CN222318572UActive Publication Date: 2025-01-07曹志兴
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Patent Information

Application Number
CN202420870987.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-25
Publication Date
2025-01-07
Estimated Expiration
2034-04-25

AI Technical Summary

Technical Problem

During offshore oil and gas mining, the gas samples taken in the submarine pipeline are complex, the workload is large, and the gas samples obtained are not pure, which affects the accurate judgment of the corrosion rate in the submarine pipeline.

Method used

An oil-gas mixed pipeline gas sampling device is designed, including a transparent sampling barrel, piston, base and seal. The gas and liquid separation are achieved through the up and down movement of the piston, and the liquid passage and liquid storage chamber structure are used to avoid oil and water pollution. And control the flow and pressure through the needle valve to ensure the pure air sample.

Benefits of technology

It realizes a light and easy-to-operate sampling process, avoids gas sample pollution and gas loss, and the obtained natural gas sample is purer, suitable for multiple oil and gas mixing pipelines and various production facilities.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a gas sampling device for an oil-gas mixed transportation pipeline. The gas sampling device comprises a sampling barrel, a base is arranged at the lower end of the sampling barrel, a piston is installed in the sampling barrel, a piston rod is arranged at the upper end of the piston, and a handle is arranged on the part, extending out of the sampling barrel, of the piston rod; a water retaining brim is arranged at the lower end of the sampling barrel, a liquid storage cavity is formed in the base, and when the piston moves downwards into the base, a liquid passing channel is formed between the piston and the water retaining brim and is communicated with the liquid storage cavity; a gas taking pipe and a liquid inlet pipe are arranged at the upper end of the sampling barrel, a liquid discharging pipe communicated with the liquid storage cavity is arranged on the base, a gas taking control valve is arranged on the gas taking pipe, a liquid inlet control valve and a liquid inlet stop valve are arranged on the liquid inlet pipe, and a liquid discharging valve is arranged on the liquid discharging pipe. The device is light in weight and convenient to use and operate, the sampling barrel is transparent, the liquid level of internal liquid can be observed conveniently, the gas taking amount can be judged conveniently, the piston can be pulled to move upwards, air in the sampling barrel can be discharged conveniently, meanwhile, the sampling barrel can separate the gas from the liquid, and the defect that sampling is not pure during conventional sampling is overcome.
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Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a gas sampling device for an oil and gas mixed transmission pipeline. Background Art

[0002] During offshore oil and gas production, submarine pipelines are channels for transporting oil and gas. In daily work, it is necessary to regularly test and analyze the oil and gas components of submarine pipelines to ensure safe and stable production. However, the current operation of taking gas samples from oil and gas mixed submarine pipelines in offshore production facilities is relatively complicated, with a large workload, and the obtained gas samples are not pure, which is not conducive to accurately judging the internal corrosion rate of submarine pipelines. At present, there are two common ways to take natural gas samples from oil and gas mixed submarine pipelines. One method is to take samples through a dedicated gas bag at the gas phase outlet of the oil and gas separator of the production facility downstream of the submarine pipeline. This method has certain limitations and is not applicable to production facilities with mixed production of multiple oil and gas mixed submarine pipelines, and it is also not applicable to production facilities with self-produced oil and gas logistics; the second method is to use the ball collecting cylinder downstream of the oil and gas submarine pipeline as a temporary oil and gas separator, and take natural gas samples at the high point of the ball collecting cylinder. The gas sample obtained by this method is not pure, and the gas may be mixed with a certain amount of nitrogen components or there may be some oil and water residues in the gas bag. Therefore, it is necessary to improve the existing gas extraction device. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a gas sampling device for an oil and gas mixed pipeline.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A gas sampling device for an oil-gas mixed transmission pipeline comprises a sampling barrel, a base is provided at the lower end of the sampling barrel, a piston is installed in the sampling barrel, a piston rod is provided at the upper end of the piston, and a handle is provided at the part of the sampling barrel extending outward from the piston rod; the upper surface of the piston is a conical surface, and a sealing member is provided between the piston rod and the sampling barrel; a water retaining eaves extending outward is provided at the lower end of the sampling barrel, the inner diameter of the base is larger than the inner diameter of the sampling barrel, and a connecting part shrinking inward is provided at the upper part of the base, the connecting part is connected with the outer wall of the sampling barrel, a liquid storage cavity is formed inside the base, when the piston moves down to the inside of the base, a liquid passage is formed between the piston and the water retaining eaves, and the liquid passage is connected with the liquid storage cavity; an air extraction pipe and a liquid inlet pipe connected with the inner cavity of the sampling barrel are provided at the upper end of the sampling barrel, a liquid discharge pipe connected with the liquid storage cavity is provided on the base, an air extraction control valve is provided on the air extraction pipe, a liquid inlet control valve and a liquid inlet stop valve are provided on the liquid inlet pipe, and a liquid discharge valve is provided on the liquid discharge pipe.

[0006] Furthermore, an air intake pipe joint is installed on the air intake pipe, and a liquid inlet pipe joint is provided on the liquid inlet pipe.

[0007] Furthermore, both the air intake control valve and the liquid intake control valve adopt needle valves.

[0008] Furthermore, the connecting portion is in a cone shape or a bottleneck shape.

[0009] Furthermore, a drain port is provided at the bottom of the base or at a position of a side wall of the base close to the bottom, and the drain pipe is connected to the drain port.

[0010] Furthermore, the height of the piston is smaller than the height of the liquid storage chamber of the base.

[0011] Furthermore, the piston is made of rubber material.

[0012] Furthermore, the handle can be detachably mounted on the piston rod.

[0013] Furthermore, the air intake pipe and the liquid inlet pipe are integrally formed with the sampling barrel, and the liquid discharge pipe is integrally formed with the base.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The invention is light in weight, easy to use and operate, and the sampling barrel is transparent, which is convenient for observing the liquid level of the internal liquid and judging the amount of gas taken. Before sampling, the control valves of the gas taking pipe and the liquid discharge pipe are opened, and the piston is pulled upward to discharge the air inside the sampling barrel, which overcomes the disadvantage of impure sampling during conventional sampling. At the same time, the sampling barrel can separate gas and liquid. When the piston is pushed to the bottom of the sampling barrel, the piston diameter and height are smaller than the bottom diameter and height of the sampling barrel, so that the liquid in the barrel is discharged into the base liquid storage cavity. In addition, the liquid can also seal the upper space of the piston, which can prevent the sampling bag from being contaminated by oil and water, and is more conducive to obtaining a pure natural gas sample, and can also prevent the loss of natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure created by the present invention;

[0018] Figure 2 A schematic diagram of the piston moving down into the base in the invention;

[0019] Figure 3 A schematic diagram of the piston in the upward movement process in the invention;

[0020] Figure 4 A schematic diagram of a base in an embodiment of the present invention;

[0021] Figure 5This is a schematic diagram of a detachable base in an embodiment of the present invention;

[0022] Figure 6 for Figure 5 Schematic diagram of the sampling barrel part. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] A gas sampling device for oil and gas mixed pipeline, such as Figures 1 to 4As shown, it includes a sampling barrel 1 made of transparent material, a base 2 is provided at the lower end of the sampling barrel, a piston 3 is installed in the sampling barrel, a piston rod 4 is provided at the upper end of the piston, and a handle 5 is provided at the part of the piston rod extending out of the sampling barrel. The sampling barrel is cylindrical, and the lower part is connected to the base. According to needs, in an optional embodiment, the base and the sampling barrel can be detachably connected. The upper surface of the piston is a conical surface 6, and a seal is provided between the piston rod and the sampling barrel. As an example, the seal can be a mechanical seal to ensure the sealing between the piston rod and the sampling barrel, to prevent excessive gas leakage inside the sampling barrel, and to prevent the natural gas sample from being collected.

[0028] The lower end of the sampling barrel is provided with a water retaining eaves 7 extending outwards, the inner diameter of the base is larger than the inner diameter of the sampling barrel, and a connecting part 8 contracting inwards is provided at the upper part of the base. For example, the connecting part includes an arc-shaped contraction section and a cylindrical connecting section, and the connecting part is connected to the outer wall of the sampling barrel (the inner diameter of the connecting part at the minimum diameter is larger than the outer diameter of the sampling barrel), and the height of the piston is smaller than the height of the liquid storage chamber of the base. A liquid backflow prevention chamber 18 is formed between the connecting part and the water retaining eaves. When the piston moves upward, even if the liquid in the base surges or is lifted upward by the piston, it will surge into the liquid backflow prevention chamber and be blocked by the water retaining eaves. The inner diameter of the base is small at the top and large at the bottom, and a liquid storage chamber 9 is formed inside the base. When the piston moves down to the inside of the base, a liquid passage 10 is formed between the piston and the water retaining eaves, and the liquid passage is connected to the liquid storage chamber. For example, the connecting part is conical or bottleneck-shaped. When the piston is pushed to the bottom, the liquid in the upper part of the sampling barrel can flow into the liquid storage chamber of the base of the sampling barrel, and then the drain valve on the drain pipe can be opened to discharge the liquid.

[0029] An air intake pipe 11 and a liquid inlet pipe 12 connected to the inner cavity of the sampling barrel are provided at the upper end of the sampling barrel, a liquid discharge pipe 13 connected to the liquid storage cavity is provided on the base, and a liquid discharge port is provided at the bottom of the base or at the side wall of the base near the bottom, and the liquid discharge pipe is connected to the liquid discharge port. An air intake pipe joint is installed at the end of the air intake pipe for connecting the sampling bag, and a liquid inlet pipe joint is provided at the end of the liquid inlet pipe for easy connection with the submarine pipeline sampling point. Usually, the piston is made of rubber material. The handle is detachably mounted on the piston rod. The air intake pipe and the liquid inlet pipe are integrally formed with the sampling barrel, and the liquid discharge pipe is integrally formed with the base.

[0030] The gas extraction pipe is provided with a gas extraction control valve 14, which is convenient for adjusting the flow rate during sampling and can also cut off the pipeline. The liquid inlet pipe is provided with a liquid inlet control valve 15 and a liquid inlet stop valve 16. The stop valve is used to control the on-off of the stop valve to control the liquid inlet amount. The liquid inlet control valve can be used to control the liquid inlet pressure. The liquid discharge pipe is provided with a liquid discharge valve 17. As an example, the gas extraction control valve and the liquid inlet control valve are both needle valves.

[0031] When in use, the piston can be used to seal the internal space of the sampling barrel. Before filling the liquid, pull the piston to the top of the barrel to discharge the air in the barrel. When filling the liquid, adjust the opening of the liquid inlet control valve and the liquid inlet stop valve. At the same time, push the piston downward to keep the liquid discharge valve at the bottom of the sampling barrel at a certain opening to discharge excess gas in the lower part of the sampling barrel. Control the pressure in the sampling barrel to maintain a slight positive pressure, and observe the ratio of liquid to natural gas in the barrel. If the gas volume reaches the sampling requirement, close the liquid inlet control valve, connect the gas bag to the gas pipe, open the gas control valve, and push the piston upward to push the natural gas sample into the gas bag.

[0032] Before the gas extraction operation, if there is more liquid in the mixed fluid, the piston can be pushed to the bottom of the sampling barrel first. The upper surface of the piston is conical, and the liquid passage is connected to the liquid storage chamber. At this time, adjust the drain valve to discharge excess liquid and keep the natural gas in the barrel. When the sampling volume requirement is reached, connect the sampling bag to the sampling pipeline and pull the piston upward to obtain the gas sample.

[0033] In an optional embodiment, if Figure 5 and Figure 6 As shown, the base is designed as a detachable structure. Specifically, a connecting ring 19 is provided on the outer wall of the lower part of the sampling barrel, and a connecting eave 20 is provided at the lower end of the connecting ring. The inner diameter of the connecting eave is larger than the maximum outer diameter of the water retaining eave. The connecting portion at the upper end of the base is detachably connected to the connecting eave. When cleaning the sampling barrel, the base can be removed, which is very convenient. As an example, the base is threadedly connected to the connecting ring. That is, an external thread is provided on the outer wall of the connecting eave, and an internal thread is provided on the inner wall of the connecting portion (cylindrical section). The two are screwed together for easy disassembly.

[0034] The invention is light in weight, easy to use and operate, and the sampling barrel is transparent, which is convenient for observing the liquid level of the internal liquid and judging the amount of gas taken. Before sampling, the control valves of the gas taking pipe and the liquid discharge pipe are opened, and the piston is pulled upward to discharge the air inside the sampling barrel, which overcomes the disadvantage of impure sampling during conventional sampling. At the same time, the sampling barrel can separate gas and liquid. When the piston is pushed to the bottom of the sampling barrel, the piston diameter and height are smaller than the bottom diameter and height of the sampling barrel, so that the liquid in the barrel is discharged into the base liquid storage cavity. In addition, the liquid can also seal the space above the piston, which can prevent the sampling bag from being contaminated by oil and water, and is more conducive to obtaining a pure natural gas sample, and can also prevent the loss of natural gas.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas sampling device for oil and gas mixed pipeline, characterized by: The utility model comprises a sampling barrel, wherein a base is provided at the lower end of the sampling barrel, a piston is installed in the sampling barrel, a piston rod is provided at the upper end of the piston, and a handle is provided at the part of the piston rod extending out of the sampling barrel; the upper surface of the piston is a conical surface, and a sealing member is provided between the piston rod and the sampling barrel; a water retaining eave extending outward is provided at the lower end of the sampling barrel, the inner diameter of the base is larger than the inner diameter of the sampling barrel, and a connecting part shrinking inward is provided at the upper part of the base, the connecting part is connected with the outer wall of the sampling barrel, a liquid storage cavity is formed inside the base, when the piston moves down to the inside of the base, a liquid passage is formed between the piston and the water retaining eave, and the liquid passage is connected with the liquid storage cavity; an air extraction pipe and a liquid inlet pipe connected with the inner cavity of the sampling barrel are provided at the upper end of the sampling barrel, a liquid discharge pipe connected with the liquid storage cavity is provided on the base, an air extraction control valve is provided on the air extraction pipe, a liquid inlet control valve and a liquid inlet stop valve are provided on the liquid inlet pipe, and a liquid discharge valve is provided on the liquid discharge pipe.

2. The gas sampling device for oil and gas mixed pipeline according to claim 1 is characterized by: An air intake pipe joint is installed on the air intake pipe, and a liquid intake pipe joint is provided on the liquid intake pipe.

3. The gas sampling device for oil-gas mixed pipeline according to claim 1, characterized in that: Both the air intake control valve and the liquid inlet control valve use needle valves.

4. The gas sampling device for oil and gas mixed pipeline according to claim 1, characterized in that: The connecting portion is in a cone shape or a bottleneck shape.

5. The gas sampling device for oil and gas mixed pipeline according to claim 1, characterized in that: A liquid discharge port is provided at the bottom of the base or at a position of the side wall of the base close to the bottom, and the liquid discharge pipe is communicated with the liquid discharge port.

6. The gas sampling device for oil-gas mixed pipeline according to claim 1, characterized in that: The height of the piston is smaller than the height of the liquid storage chamber of the base.

7. The gas sampling device for oil-gas mixed pipeline according to claim 1, characterized in that: The piston is made of rubber material.

8. The gas sampling device for oil-gas mixed pipeline according to claim 1, characterized in that: The handle is detachably mounted on the piston rod.

9. The gas sampling device for oil and gas mixed pipeline according to claim 1, characterized in that: The air intake pipe and the liquid inlet pipe are integrally formed with the sampling barrel, and the liquid discharge pipe is integrally formed with the base.