A wellhead natural gas pressurization system

Abstract

The utility model relates to oil and gas gathering and transferring equipment technical field discloses a wellhead natural gas pressurization system, including first cyclone separator and second cyclone separator, its characterized in that: the upper end of first cyclone separator and second cyclone separator is provided with fifth pneumatic ball valve and second pneumatic tee ball valve, be provided with first pneumatic tee ball valve between first cyclone separator and second cyclone separator, through the cooperation between first cyclone flow divider, second cyclone separator, multiple groups of pneumatic ball valve, multiple groups of pneumatic tee ball valve and air pressure detection structure, utilize wellhead to come gas's pressure as power source under the condition that wellhead pressure is enough, if not enough, then introduce the pressure after pressurization and promote gas-liquid mixed transportation process, need not extra add complicated power equipment, reduced equipment investment and energy consumption, simultaneously, through each group of valve reasonable control gas-liquid flow, make gas-liquid be able to efficiently transport in the system, improved conveying efficiency.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas gathering and transportation equipment technology, specifically a wellhead natural gas pressurization system. Background Technology

[0002] Existing wellhead liquid metering methods are mostly volumetric measurement methods, which have low metering accuracy. Separators cannot quickly and completely separate liquids under high gas and liquid flow conditions, often resulting in gas-liquid mixing and inaccurate gas and liquid measurements with large errors. Generally, wellhead multiphase metering devices are divided into three main categories based on their measurement principles: complete oil-gas separation metering, simplified oil-gas separation metering, and non-separated oil-gas metering. Current oil-gas separation metering technologies commonly use two-phase separators to achieve gas-liquid separation. However, this technology cannot quickly and completely separate liquids under high flow conditions, often resulting in gas-liquid mixing and inaccurate gas and liquid measurements with large errors.

[0003] However, current wellhead oil and gas mixed transportation systems generally utilize multiple sets of drainage system pipelines. Due to the limited negative pressure capacity and discharge pressure of the system, the gas-liquid mixed transportation effect is poor, and the problem of low gas-liquid mixed transportation efficiency cannot be fundamentally solved. Therefore, we need to propose a wellhead natural gas pressurization system. Utility Model Content

[0004] The purpose of this invention is to provide a wellhead natural gas pressurization system that separates a mixture of natural gas and liquid with a high liquid-gas ratio from the wellhead. The separated natural gas enters a compressor for pressurization and external transmission. The separated liquid is pressurized by using natural gas as a power source to pressurize the liquid and then pumps the separated liquid into the external transmission pipeline network to achieve the purpose of gas-liquid mixed transmission, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a wellhead natural gas pressurization system, comprising a first cyclone separator and a second cyclone separator, characterized in that: a fifth pneumatic ball valve and a second pneumatic three-way ball valve are provided at the upper ends of the first and second cyclone separators; a first pneumatic three-way ball valve is provided between the first and second cyclone separators; a third pneumatic three-way ball valve is provided at the lower ends of the first and second cyclone separators; and a third check valve is provided at the other end of the third pneumatic three-way ball valve; a downstream pipeline is provided at one end of the third check valve; the other end of the first pneumatic three-way ball valve is connected to the first check valve and the second check valve; a gas pressure detection structure is provided on the first check valve; and an air inlet and a venting system pipeline are provided on the gas pressure detection structure.

[0006] Preferably, a second pressure gauge and a second pressure transmitter are installed at the upper end of the first cyclone separator, a third temperature gauge and a first liquid level switch are provided at the middle of the outer side of the first cyclone separator, and a first liquid level transmitter is provided at the lower outer side of the first cyclone separator.

[0007] Preferably, a third pressure gauge and a third pressure transmitter are installed at the upper end of the second cyclone separator, a second liquid level switch and a fourth temperature gauge are provided at the middle of the outer side of the second cyclone separator, and a second liquid level transmitter is installed at the lower outer side of the second cyclone separator.

[0008] Preferably, the other end of the second pneumatic three-way ball valve is connected to a fourth one-way valve, and one end of the fourth one-way valve is provided with a compressor inlet pipe, while one end of the second one-way valve is provided with a drain port.

[0009] Preferably, a fourth pneumatic ball valve and a third pneumatic ball valve are provided between the second cyclone separator and the first cyclone separator, and a second nitrogen inlet valve is connected between the third pneumatic ball valve and the fourth pneumatic ball valve. The inlet end of the second nitrogen inlet valve is provided with a pipeline before the valve.

[0010] Preferably, the pressure detection structure includes a first differential pressure gauge and a second differential pressure gauge connected to one end of the first check valve. Both the first and second differential pressure gauges are connected to a first temperature gauge at their ends relative to the first check valve. A first pressure transmitter is provided at the end of the first temperature gauge relative to the first differential pressure gauge. A second pneumatic ball valve and a self-regulating pressure valve are provided at the end of the first pressure transmitter relative to the first temperature gauge. A first nitrogen inlet valve is provided between the first pressure transmitter and the second pneumatic ball valve. A venting system pipeline is provided at one end of the second pneumatic ball valve.

[0011] Preferably, one end of the self-standing pressure regulating valve is connected to a first pneumatic ball valve, and one end of the first pneumatic ball valve is connected to a one-way ball valve and a wellhead air inlet pipe. One end of the one-way ball valve is located between the third one-way valve and the downstream pipeline. A safety valve is located between the second pneumatic ball valve and the self-standing regulating valve.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model mainly utilizes the cooperation between the first cyclone separator, the second cyclone separator, multiple sets of pneumatic ball valves, multiple sets of pneumatic three-way ball valves, and the gas pressure detection structure. When the wellhead pressure is sufficient, the pressure of the gas coming from the wellhead itself is used as the power source. If the pressure is insufficient, the pressurized pressure is introduced to drive the gas-liquid mixing process. There is no need to add complex power equipment, which reduces equipment investment and energy consumption. At the same time, by reasonably controlling the gas-liquid flow through each set of valves, the gas and liquid can be transported efficiently in the system, which improves the transportation efficiency.

[0014] 2. This utility model, through the setting of a self-regulating pressure valve, enables the liquid to buffer the pressure fluctuations of the gas to a certain extent, making the entire conveying process more stable. At the same time, the self-regulating pressure valve can adjust the pressure, flow rate and other parameters of the gas-liquid mixture according to actual needs, ensuring that the gas-liquid mixture can be conveyed stably, meeting the conveying requirements under different working conditions, and avoiding the impact of large fluctuations in pressure and flow rate on the normal operation of downstream equipment. Attached Figure Description

[0015] Figure 1 This is a system schematic diagram of the present invention;

[0016] Figure 2 For the present utility model Figure 1 A partial schematic diagram of a cyclone separator;

[0017] Figure 3 For the present utility model Figure 1 A partial schematic diagram of the medium air pressure detection structure.

[0018] In the diagram: 1. First cyclone separator; 2. Second cyclone separator; 3. Second pressure gauge; 4. Third pressure gauge; 5. First level switch; 6. Second level switch; 7. First level transmitter; 8. Second level transmitter; 9. Third temperature gauge; 10. Fourth temperature gauge; 11. Second pneumatic three-way ball valve; 12. Fifth pneumatic ball valve; 13. First pneumatic three-way ball valve; 14. Third pneumatic ball valve; 15. Fourth pneumatic ball valve; 16. Third pneumatic three-way ball valve; 17. First check valve; 18. Second check valve; 19. Third check valve; 20. Second differential pressure gauge; 21. First differential pressure gauge; 22. First thermometer; 23. First pressure transmitter; 24. Second pneumatic ball valve; 25. Safety valve; 26. First nitrogen inlet valve; 27. Second nitrogen inlet valve; 28. Fourth check valve; 29. ​​Self-regulating pressure valve; 30. First pneumatic ball valve; 31. Check ball valve; 32. Compressor inlet pipe; 33. Wellhead inlet pipe; 34. Drain outlet; 35. Post-valve pipeline; 36. Pre-valve pipeline; 37. Venting system pipeline; 38. Second pressure transmitter; 39. Third pressure transmitter. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3This utility model provides a technical solution: a wellhead natural gas pressurization system, including a first cyclone separator 1 and a second cyclone separator 2. A fifth pneumatic ball valve 12 and a second pneumatic three-way ball valve 11 are provided at the upper ends of the first cyclone separator 1 and the second cyclone separator 2. A first pneumatic three-way ball valve 13 is provided between the first cyclone separator 1 and the second cyclone separator 2. A third pneumatic three-way ball valve 16 is provided at the lower ends of the first cyclone separator 1 and the second cyclone separator 2. A third check valve 19 is provided at the other end of the third pneumatic three-way ball valve 16. A valve downstream pipeline 35 is provided at one end of the third check valve 19. A first check valve 17 and a second check valve 18 are connected at the other end of the first pneumatic three-way ball valve 13. A gas pressure detection structure is provided on the first check valve 17. An air inlet and a venting system pipeline 37 are provided on the gas pressure detection structure.

[0021] The upper end of the first cyclone separator 1 is equipped with a second pressure gauge 3 and a second pressure transmitter 38. The middle of the outer side of the first cyclone separator 1 is equipped with a third temperature gauge 9 and a first liquid level switch 5. The lower end of the outer side of the first cyclone separator 1 is equipped with a first liquid level transmitter 7.

[0022] In this embodiment, the second pressure gauge 3 can provide on-site operators with intuitive pressure readings, making it easy to quickly determine whether the pressure is within the normal range. The second pressure transmitter 38 can convert the pressure signal into an electrical signal and transmit it to the control system to achieve remote real-time monitoring. When the pressure fluctuates abnormally, the control system can capture the signal in time and trigger an early warning or control mechanism to avoid safety accidents such as equipment damage or leakage caused by excessive pressure, or affect the efficiency of the subsequent pressurization process due to excessively low pressure.

[0023] The third temperature gauge 9 can monitor the temperature of the natural gas and liquid mixture in the first cyclone separator 1 in real time. The temperature data provides a basis for judging whether the medium is in a suitable separation state. If the temperature is abnormal (such as too high, which will change the properties of the medium, or too low, which may cause freezing and blockage), the process parameters can be adjusted in time to ensure the separation effect. The first liquid level switch 5 can accurately monitor the liquid level height of the first cyclone separator 1. When the liquid level exceeds the set upper limit or falls below the set lower limit, it can trigger the corresponding valve switch action to prevent the liquid level from being too high and causing the liquid to enter the subsequent pipeline with the natural gas and affect the pressurization equipment, or the liquid level from being too low and causing the separator to dry burn and run unstablely.

[0024] The upper end of the second cyclone separator 2 is equipped with a third pressure gauge 4 and a third pressure transmitter 39. The middle of the outer side of the second cyclone separator 2 is equipped with a second liquid level switch 6 and a fourth temperature gauge 10. The lower end of the outer side of the second cyclone separator 2 is equipped with a second liquid level transmitter 8.

[0025] Specifically, the third pressure gauge 4 and the third pressure transmitter 39 are used to monitor the second cyclone separator 2, while the second level switch 6 and the fourth temperature gauge 10 affect the separation effect of the second cyclone separator 2 by influencing the liquid level and temperature, respectively. The second level transmitter 8 and the first level transmitter 7 form a continuous liquid level monitoring system. The sewage discharge of the two devices is reasonably planned, reducing manual intervention, improving the automation level of the system, ensuring that the two separators work together efficiently, and providing a high-quality gas source for pressurization.

[0026] The other end of the second pneumatic three-way ball valve 11 is connected to the fourth one-way valve 28, and one end of the fourth one-way valve 28 is provided with a compressor inlet pipe 32, and one end of the second one-way valve 18 is provided with a drain port 34.

[0027] Furthermore, the natural gas delivery path can be flexibly switched while preventing natural gas backflow, avoiding affecting the separation effect and damaging the compressor, and ensuring stable and safe compressor intake; at the same time, the second one-way valve 18 is equipped with a drain port 34 at one end, which can prevent impurities from flowing back during drainage, and facilitate timely discharge of separated liquid based on liquid level data, avoiding pipeline blockage and equipment corrosion. Combined with the liquid level monitoring device, it can achieve accurate drainage, reduce gas waste and system failure, and ensure the continuous and stable operation of the booster system.

[0028] A fourth pneumatic ball valve 15 and a third pneumatic ball valve 14 are provided between the second cyclone separator 2 and the first cyclone separator 1, and a second nitrogen inlet valve 27 is connected between the third pneumatic ball valve 14 and the fourth pneumatic ball valve 15. A valve inlet pipeline 36 is provided at the inlet end of the second nitrogen inlet valve 27.

[0029] In a further preferred embodiment, nitrogen can be introduced to replace natural gas during maintenance to reduce safety risks. During the initial startup or when the pressure is insufficient, pressure can be supplemented to ensure the separation effect. By controlling two pneumatic ball valves, the nitrogen pipeline and the separator pipeline can be isolated to prevent media contamination or leakage. In an emergency, the pressure can be quickly replenished to avoid system paralysis, thereby improving the system's risk resistance and operational stability.

[0030] The air pressure detection structure includes a first differential pressure gauge 21 and a second differential pressure gauge 20 connected to one end of the first check valve 17. The first differential pressure gauge 21 and the second differential pressure gauge 20 are both connected to a first temperature gauge 22 at one end relative to the first check valve 17. A first pressure transmitter 23 is provided at one end of the first temperature gauge 22 relative to the first differential pressure gauge 21. A second pneumatic ball valve 24 and a self-standing pressure regulating valve 29 are provided at one end of the first pressure transmitter 23 relative to the first temperature gauge 22. A first nitrogen inlet valve 26 is provided between the first pressure transmitter 23 and the second pneumatic ball valve 24. A venting system pipeline 37 is provided at one end of the second pneumatic ball valve 24.

[0031] It is worth noting that the first one-way valve 17 is connected to the first differential pressure gauge 21, the second differential pressure gauge 20, the first temperature gauge 22, and the first pressure transmitter 23, which can accurately monitor the pressure difference and temperature, improve the accuracy of fault diagnosis, and realize remote pressure early warning. The second pneumatic ball valve 24 and the self-standing pressure regulating valve 29 can automatically stabilize the pipeline pressure and isolate the pipeline for easy maintenance in case of failure. At the same time, the first nitrogen inlet valve 26 and the venting system pipeline 37 can replace the pipeline medium, replenish pressure, or provide emergency pressure relief, providing stable conditions for subsequent processes and ensuring the safe operation of the system.

[0032] One end of the self-standing pressure regulating valve 29 is connected to the first pneumatic ball valve 30, and one end of the first pneumatic ball valve 30 is connected to the one-way ball valve 31 and the wellhead air inlet pipe 33. One end of the one-way ball valve 31 is located between the third one-way valve 19 and the downstream pipeline 35. A safety valve 25 is located between the second pneumatic ball valve 24 and the self-standing regulating valve.

[0033] In addition, the self-standing pressure regulating valve 29 is connected to the first pneumatic ball valve 30, the one-way ball valve 31 and the wellhead air inlet pipe 33, which can stabilize the medium pressure before delivery, prevent medium backflow and contamination, ensure stable raw material supply, and isolate the medium to ensure safety during maintenance. At the same time, the one-way ball valve 31 is connected between the third one-way valve 19 and the downstream pipeline 35 to form a bidirectional complementary delivery path, avoiding system paralysis caused by a single path failure. Furthermore, a safety valve 25 is installed between the second pneumatic ball valve 24 and the self-standing regulating valve to build dual pressure protection, automatically release pressure in emergencies, improve the safety protection system, and ensure the system is safe and stable under various working conditions.

[0034] The process of mixed transportation:

[0035] Initially, neither the first cyclone separator 1 nor the second cyclone separator 2 has liquid or the liquid level is insufficient for discharge. The first pneumatic three-way ball valve 13 and the second pneumatic three-way ball valve 11 guide the system into the first cyclone separator 1, while the third pneumatic three-way ball valve 16 and the fifth pneumatic ball valve 12 close the first cyclone separator 1 to begin production. If the liquid level in the first cyclone separator 1 meets the discharge requirements, the first pneumatic three-way ball valve 13 and the second pneumatic three-way ball valve 11 guide the system into the second cyclone separator 2.

[0036] Secondly, when the liquid level in the first cyclone separator 1 needs to be drained, the first pneumatic three-way ball valve 13 and the second pneumatic three-way ball valve 11 close the first cyclone separator 1 and open the second cyclone separator 2. At the same time, the third pneumatic ball valve 14 opens, and the third pneumatic three-way ball valve 16 opens to the first cyclone separator 1. The high-pressure gas from the compressor outlet is introduced into the first cyclone separator 1 through the third pneumatic ball valve 14. Moreover, the third pneumatic three-way ball valve 16 connects the first cyclone separator 1 to the external pipeline. The high-pressure gas mixes the hydraulic fluid from the first cyclone separator 1 into the pipeline and the discharge from the compressor skid and transports it to the downstream treatment station.

[0037] Meanwhile, after the first cyclone separator 1 discharges liquid to the lower liquid level, the third pneumatic ball valve 14 is closed, and the fifth pneumatic ball valve 12 is opened to balance the pressure of the first cyclone separator 1 and the second cyclone separator 2 until the pressure of the first cyclone separator 1 and the second cyclone separator 2 is balanced and then closed.

[0038] Finally, when the liquid level of the second cyclone separator 2 is discharged, the working process is as follows: close the fifth pneumatic ball valve 12, the first pneumatic three-way ball valve 13 and the second pneumatic three-way ball valve 11 to introduce the first cyclone separator 1 into the system, open the fourth pneumatic ball valve 15, and connect the third pneumatic three-way ball valve 16 to the second cyclone separator 2 for liquid discharge. After the discharge is completed, close the fourth pneumatic ball valve 15 and open the fifth pneumatic ball valve 12 to balance the pressure.

[0039] It is worth noting that the opening speed of the fifth pneumatic ball valve 12 needs to be controlled to prevent high pressure fluctuations in the inlet pressure caused by high pressure gas. At the same time, in the case of insufficient wellhead pressure, the pressurized pressure can be introduced as power to ensure the efficiency of gas-liquid mixing.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wellhead natural gas pressurization system, comprising a first cyclone separator (1) and a second cyclone separator (2), characterized in that: The first cyclone separator (1) and the second cyclone separator (2) are provided with a fifth pneumatic ball valve (12) and a second pneumatic three-way ball valve (11) at their upper ends. The first cyclone separator (1) and the second cyclone separator (2) are provided with a first pneumatic three-way ball valve (13). The first cyclone separator (1) and the second cyclone separator (2) are provided with a third pneumatic three-way ball valve (16) at their lower ends. The other end of the third pneumatic three-way ball valve (16) is provided with a third check valve (19). One end of the third check valve (19) is provided with a valve downstream pipeline (35). The other end of the first pneumatic three-way ball valve (13) is connected to a first check valve (17) and a second check valve (18). The first check valve (17) is provided with a pressure detection structure. The pressure detection structure is provided with an air inlet and an venting system pipeline (37).

2. The wellhead natural gas pressurization system according to claim 1, characterized in that: The upper end of the first cyclone separator (1) is equipped with a second pressure gauge (3) and a second pressure transmitter (38), the middle of the outer side of the first cyclone separator (1) is provided with a third temperature gauge (9) and a first liquid level switch (5), and the lower end of the outer side of the first cyclone separator (1) is provided with a first liquid level transmitter (7).

3. The wellhead natural gas pressurization system according to claim 1, characterized in that: The upper end of the second cyclone separator (2) is equipped with a third pressure gauge (4) and a third pressure transmitter (39). The middle part of the outer side of the second cyclone separator (2) is equipped with a second liquid level switch (6) and a fourth temperature gauge (10). The lower part of the outer side of the second cyclone separator (2) is equipped with a second liquid level transmitter (8).

4. The wellhead natural gas pressurization system according to claim 1, characterized in that: The other end of the second pneumatic three-way ball valve (11) is connected to a fourth check valve (28), and one end of the fourth check valve (28) is provided with a compressor inlet pipe (32), and one end of the second check valve (18) is provided with a drain port (34).

5. A wellhead natural gas pressurization system according to claim 1, characterized in that: A fourth pneumatic ball valve (15) and a third pneumatic ball valve (14) are provided between the second cyclone separator (2) and the first cyclone separator (1), and a second nitrogen inlet valve (27) is connected between the third pneumatic ball valve (14) and the fourth pneumatic ball valve (15). A valve inlet pipeline (36) is provided at the inlet end of the second nitrogen inlet valve (27).

6. A wellhead natural gas pressurization system according to claim 1, characterized in that: The pressure detection structure includes a first differential pressure gauge (21) and a second differential pressure gauge (20) connected to one end of the first check valve (17). The first differential pressure gauge (21) and the second differential pressure gauge (20) are connected to a first thermometer (22) at one end of the first check valve (17). A first pressure transmitter (23) is provided at one end of the first thermometer (22) relative to the first differential pressure gauge (21). A second pneumatic ball valve (24) and a self-regulating pressure regulating valve (29) are provided at one end of the first pressure transmitter (23) relative to the first thermometer (22). A first nitrogen inlet valve (26) is provided between the first pressure transmitter (23) and the second pneumatic ball valve (24). A venting system pipeline (37) is provided at one end of the second pneumatic ball valve (24).

7. A wellhead natural gas pressurization system according to claim 6, characterized in that: One end of the self-standing pressure regulating valve (29) is connected to the first pneumatic ball valve (30), and one end of the first pneumatic ball valve (30) is connected to the one-way ball valve (31) and the wellhead air inlet pipe (33). One end of the one-way ball valve (31) is located between the third one-way valve (19) and the downstream pipeline (35). A safety valve (25) is located between the second pneumatic ball valve (24) and the self-standing regulating valve.

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