Novel washing and draining device for crude natural gas in oil field

Abstract

The invention relates to the technical field of natural gas washing, and discloses a novel oil field crude natural gas washing drainer which comprises a washing tank, a compressor and a controller, a gas inlet is formed in the upper portion of the side face of the washing tank, a drain pipe is arranged on the lower portion of the washing tank, an exhaust port is formed in the top of the washing tank, a filter screen is arranged on the inner upper portion of the washing tank, a partition plate is fixedly connected to the middle of the interior of the washing tank, and a drain electromagnetic valve is installed on the drain pipe; the interior of the washing tank is divided into an upper cavity and a lower cavity by the partition plate, a low-pressure-drop one-way valve and a balance electromagnetic valve are arranged between the upper cavity and the lower cavity, and a liquid level sensor is mounted in the lower cavity; a branch pipe connected to the lower cavity is arranged on a pipeline at the output end of the compressor, and a high-pressure electromagnetic valve is installed on the branch pipe. Liquid drainage of the washing tank is not affected by gas source pressure fluctuation, liquid drainage can be smoothly achieved, the purification and automatic liquid drainage functions are achieved, liquid drainage is achieved by means of the exhaust pressure of the compressor unit, normal gas conveying of the unit is not affected in the liquid drainage process, and the investment cost and the operation cost are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas washing, and specifically to a new type of crude natural gas washing and drainage device for oil fields. Background Art

[0002] At present, the crude natural gas produced in oil and gas fields can be transported to the gas-using end through a compressor for further treatment or utilization after preliminary washing and purification. The purpose of the preliminary washing and purification is to remove the particles and liquid droplets in the crude natural gas to avoid wear and liquid hammer on the booster compressor, which is crucial for maintaining the normal working state and service life of the compressor.

[0003] As shown in the appendix Figure 1 The crude natural gas enters the scrubber. After being filtered and washed by the internal filter screen, the particles and liquid of the crude natural gas are filtered out and accumulated at the lower part of the cylinder body. When the liquid level sensor senses a high liquid level, it triggers automatic drainage. The drainage is achieved by relying on the pressure of the natural gas itself to transfer the liquid. The purified natural gas is sucked into the compressor, compressed and transported to the user.

[0004] In the above traditional configuration, the equipment can work normally when the gas source pressure is stable. When the gas source decreases while the user still has a high demand for natural gas, the compressor will continuously suck in gas to meet the user's needs, and the pressure of the scrubber will decrease. When the pressure of the natural gas itself decreases and the liquid cannot be discharged, the liquid level will gradually rise. When the liquid level rises to the high liquid level protection point, the liquid level switch will trigger a high liquid level fault, causing the equipment to malfunction and stop, affecting the normal production of the user. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a new type of crude natural gas washing and drainage device for oil fields.

[0006] To solve the above problems, the technical solution of the present invention is: a new type of crude natural gas washing and drainage device for oil fields, including a washing tank, a compressor and a controller. The upper part of the side of the washing tank is provided with an air inlet, the lower part is provided with a drain pipe, the top is provided with an exhaust port, and a drain solenoid valve is installed on the drain pipe;

[0007] The upper part inside the washing tank is provided with a filter screen, and a partition is fixedly connected in the middle. The partition divides the inside of the washing tank into an upper cavity and a lower cavity. There are two connecting pipes between the upper cavity and the lower cavity, and a low-pressure-drop one-way valve and a balance solenoid valve are respectively installed on the two connecting pipes. A liquid level sensor is installed in the lower cavity;

[0008] A branch pipe connected to the lower cavity is provided on the pipeline at the output end of the compressor, and a high-pressure solenoid valve is installed on the branch pipe.

[0009] Further, the exhaust port at the top of the washing tank is connected to the compressor through a conduit.

[0010] Further, a high liquid level protection switch is installed in the upper part of the washing tank, and the high liquid level protection switch is located below the filter screen.

[0011] Further, the liquid in the upper cavity flows into the lower cavity through the pipeline where the low-pressure drop check valve is located, and the gas in the lower cavity enters the upper cavity through the pipeline where the balance solenoid valve is located.

[0012] Further, when the liquid level sensor triggers the high control liquid level, the liquid discharge process is entered, the balance solenoid valve is closed, the liquid discharge solenoid valve and the high-pressure solenoid valve are opened, and the high-pressure gas discharged by the compressor enters the lower cavity.

[0013] Further, when the liquid level sensor triggers the low control liquid level, the liquid discharge solenoid valve is closed, the balance solenoid valve is opened, the gas in the lower cavity enters the upper cavity through the pipeline where the balance solenoid valve is located, and the liquid discharge process ends.

[0014] The advantages of the present invention compared with the existing technology are as follows:

[0015] 1. The liquid discharge of the washing tank is not affected by the fluctuation of the gas source pressure, and the liquid can be discharged smoothly, realizing the functions of purification and automatic liquid discharge.

[0016] 2. The liquid discharge is realized by means of the pressure of the exhaust gas of the compressor unit, and the liquid discharge process does not affect the normal gas transmission of the unit, saving investment costs and operating costs. Brief Description of the Drawings

[0017] Figure 1 is a structural diagram of a natural gas scrubber in the prior art.

[0018] Figure 2 is a structural diagram of the present invention.

[0019] As shown in the figure: 1. Washing tank; 101. Upper cavity; 102. Lower cavity; 2. Liquid discharge solenoid valve; 3. High liquid level protection switch; 4. Liquid level sensor; 5. Compressor; 6. High-pressure solenoid valve; 7. Low-pressure drop check valve; 8. Balance solenoid valve; 9. Controller; 10. Filter screen; 11. Partition board. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the 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.

[0021] As Figure 2As shown in the figure, a new type of crude natural gas scrubbing and draining device for oil fields includes a scrubbing tank 1, a compressor 5, and a controller 9. The upper part of the side of the scrubbing tank 1 is provided with an air inlet, the lower part is provided with a drain pipe, and the top is provided with an exhaust port. A drain solenoid valve 2 is installed on the drain pipe. The exhaust port at the top of the scrubbing tank 1 is connected to the compressor 5 through a conduit. A high liquid level protection switch 3 is installed in the upper part of the scrubbing tank 1, and the high liquid level protection switch 3 is located below the filter screen 10.

[0022] A filter screen 10 is provided in the upper part of the scrubbing tank 1. A partition 11 is fixedly connected in the middle. The partition 11 divides the interior of the scrubbing tank 1 into an upper cavity 101 and a lower cavity 102. There are two connecting pipes between the upper cavity 101 and the lower cavity 102. A low-pressure-drop check valve 7 and a balance solenoid valve 8 are respectively installed on the two connecting pipes. A liquid level sensor 4 is installed in the lower cavity 102.

[0023] A branch pipe connected to the lower cavity 102 is provided on the pipeline at the output end of the compressor 5, and a high-pressure solenoid valve 6 is installed on the branch pipe.

[0024] The liquid in the upper cavity 101 flows into the lower cavity 102 through the pipeline where the low-pressure-drop check valve 7 is located, and the gas in the lower cavity 102 enters the upper cavity 101 through the pipeline where the balance solenoid valve 8 is located. When the liquid level sensor 4 triggers the high control liquid level, the draining process starts. The balance solenoid valve 8 closes, and the drain solenoid valve 2 and the high-pressure solenoid valve 6 open. The high-pressure gas discharged by the compressor 5 enters the lower cavity 102. When the liquid level sensor 4 triggers the low control liquid level, the drain solenoid valve 2 closes, the balance solenoid valve 8 opens, and the gas in the lower cavity 102 enters the upper cavity 101 through the pipeline where the balance solenoid valve 8 is located, and the draining process ends.

[0025] In specific use, the crude natural gas from oil and gas fields with liquid droplets and particles enters the scrubbing tank 1. After being purified by the built-in filter screen 10, the relatively pure natural gas is sucked by the compressor 5 and compressed into high-pressure gas for delivery to users. The liquid filtered and washed out falls on the partition 11 and flows into the lower cavity 102 through the pipeline where the low-pressure-drop check valve 7 is located under the action of gravity. The gas in the lower part enters the upper cavity 101 along the pipeline where the balance solenoid valve 8 is located. As the liquid in the lower part accumulates and the liquid level rises to the high control liquid level, the draining process starts.

[0026] When the liquid level sensor 4 triggers the high liquid level, the balance solenoid valve 8 closes, the drain solenoid valve 2 and the high-pressure solenoid valve 6 open. The high-pressure gas discharged by the compressor 5 enters the lower cavity 102 of the scrubbing tank 1, the pressure in the lower part of the tank increases, and the drain solenoid valve 2 is opened. The liquid is discharged from the tank under the action of high pressure.

[0027] When the liquid level sensor 4 triggers the low control liquid level, the drain solenoid valve 2 closes and the balance solenoid valve 8 opens. The high-pressure gas in the lower part enters the upper cavity 101 along the pipeline where the balance solenoid valve 8 is located, and at this time the liquid drainage process ends.

[0028] While realizing the natural gas purification function, the present invention realizes the liquid drainage function of the washing tank 1 by means of the pressure of the exhaust gas of the compressor 5. It can adapt to the following environments: 1. Oil and gas fields with unstable gas sources; 2. Oil and gas fields with stable gas sources but relatively low pressures; 3. Other similar wet-compressed gas environments.

[0029] The device adds partitions, falling liquid check valves, balance solenoid valves, high-pressure solenoid valves, etc. in a traditional scrubber, thereby realizing the functions of purification and automatic liquid drainage, enabling the subsequent booster units to be competent for various harsh working conditions.

[0030] The parts not disclosed in the present invention are all prior arts, and their specific structures and working principles will not be elaborated herein.

[0031] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0033] The above describes the present invention and its implementation manners, and this description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A novel crude natural gas scrubbing and draining device for oil fields, comprising a scrubbing tank (1), a compressor (5) and a controller (9). An air inlet is provided at the upper part of the side of the scrubbing tank (1), a drain pipe is provided at the lower part, and an exhaust port is provided at the top. A drain solenoid valve (2) is installed on the drain pipe. It is characterized in that: A filter screen (10) is provided at the upper part inside the scrubbing tank (1), and a partition plate (11) is fixedly connected in the middle inside. The partition plate (11) divides the inside of the scrubbing tank (1) into an upper cavity (101) and a lower cavity (102). There are two connecting pipes between the upper cavity (101) and the lower cavity (102). A low-pressure-drop check valve (7) and a balance solenoid valve (8) are respectively installed on the two connecting pipes. A liquid level sensor (4) is installed in the lower cavity (102); On the pipeline at the output end of the compressor (5), there is a branch pipe connected to the lower cavity (102), and a high-pressure solenoid valve (6) is installed on the branch pipe.

2. A novel crude natural gas scrubbing and draining device for oil fields according to claim 1, characterized in that: The exhaust port at the top of the scrubbing tank (1) is connected to the compressor (5) through a conduit.

3. A novel oilfield crude natural gas washing and draining device according to claim 1, characterized in that: A high liquid level protection switch (3) is installed at the upper part inside the scrubbing tank (1), and the high liquid level protection switch (3) is located below the filter screen (10).

4. A novel oilfield crude natural gas washing and discharging liquid device according to claim 1, characterized in that: The liquid in the upper cavity (101) flows into the lower cavity (102) through the pipeline where the low-pressure-drop check valve (7) is located, and the gas in the lower cavity (102) enters the upper cavity (101) through the pipeline where the balance solenoid valve (8) is located.

5. A novel crude natural gas scrubbing and draining device for oil fields according to claim 4, characterized in that: When the liquid level sensor (4) triggers the high control liquid level, the draining process is entered. The balance solenoid valve (8) is closed, the drain solenoid valve (2) and the high-pressure solenoid valve (6) are opened, and the high-pressure gas discharged by the compressor (5) enters the lower cavity (102).

6. The novel crude natural gas scrubbing and draining device for oil fields according to claim 5, characterized in that: When the liquid level sensor (4) triggers the low control liquid level, the drain solenoid valve (2) is closed, the balance solenoid valve (8) is opened, the gas in the lower cavity (102) enters the upper cavity (101) through the pipeline where the balance solenoid valve (8) is located, and the draining process ends.

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