Three-phase separator with temperature control function for oil field

Abstract

The utility model relates to the technical field of three-phase separators for oil fields, in particular to a three-phase separator with a temperature control function for an oil field. Comprising a tank body, an oil-gas pre-separator is arranged on the tank body, a feeding pipeline is connected to the oil-gas pre-separator, a second-stage baffle is arranged in the tank body, a first-stage baffle is arranged between the second-stage baffle and the oil-gas pre-separator, and a first-stage coalescence packing layer, a second-stage coalescence packing layer and a water outlet are sequentially arranged between the oil-gas pre-separator and the first-stage baffle. A water outlet is formed in the tank body, a gas separation bag is arranged above the water outlet, a secondary oil outlet is formed in the tank body and located in the side away from the oil-gas pre-separator, and a primary oil outlet is formed between the secondary baffle and the primary baffle. According to the device, the magnetic iron remover and the coarse filter are sequentially arranged on the feeding pipeline, so that iron-containing impurities and large-particle substances in raw materials can be effectively removed, the abrasion and blockage of the impurities to the coalescence filler are reduced, and the service life of the coalescence filler is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of three-phase separators for oil fields, specifically a three-phase separator for oil fields with temperature control function. Background Technology

[0002] In the complex and critical production process of oilfield development, the three-phase separator, as the core equipment for achieving efficient separation of oil, gas, and water, directly affects the economic benefits and resource utilization rate of oilfield production. However, the three-phase separators widely used in oilfields currently exhibit numerous problems that urgently need to be addressed in actual operation.

[0003] From a temperature perspective, when equipment is in an environment with significant internal and external temperature differences, such as in desert oilfields with significant diurnal temperature variations, or during winter operations in cold regions, condensation is easily generated inside the equipment due to temperature changes. This condensation interferes with the originally relatively stable separation process of the oil, gas, and water phases, blurring the interfaces between the phases and making precise separation difficult. Ultimately, this significantly reduces the separation efficiency, failing to meet the oilfield's requirements for high-quality oil and gas resource production.

[0004] Regarding impurities, the raw materials obtained from oilfield extraction are often complex in composition, inevitably containing large particles such as silt and gravel, as well as iron-containing impurities generated during the wear and tear of extraction equipment. When these impurities enter the three-phase separator, the coalescing packing is the first to be affected. Large particles directly cause physical wear to the surface structure of the coalescing packing, damaging its pore structure; while iron-containing impurities not only wear down the packing but may also react chemically with it, accelerating its aging and damage. This series of effects significantly shortens the service life of the coalescing packing, increasing equipment maintenance costs and downtime replacement cycles. More seriously, the decline in the performance of the coalescing packing directly leads to a decrease in overall separation efficiency, making the phenomenon of water-in-oil and oil-in-water more prominent, resulting in resource waste.

[0005] Furthermore, existing three-phase separators have limitations in gas phase separation technology. The separated gas phase often carries a large number of liquid droplets, making it difficult to achieve the desired purity. For example, in the subsequent compression, transportation, and processing of natural gas, excessive liquid in the gas phase can cause equipment corrosion, pipeline blockage, and other problems. This not only increases operating costs but also poses certain safety hazards, having a very negative impact on the stable operation of the entire oil and gas industry chain. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a three-phase separator for oilfields with temperature control functionality. By sequentially installing a magnetic separator and a coarse filter on the feed pipe, iron-containing impurities and large particles in the feedstock can be effectively removed, reducing wear and blockage of the coalescing packing material and extending its service life. Simultaneously, the temperature control jacket on the outside of the oil-gas pre-separator can adjust the temperature according to actual operating conditions, reducing the impact of large internal and external temperature differences on the separation effect and enabling the equipment to operate stably under a wider range of temperature conditions.

[0007] This utility model is achieved using the following technical solution:

[0008] The aforementioned three-phase separator for oilfields with temperature control function includes a tank body, an oil-gas pre-separator on the tank body, a feed pipe connected to the oil-gas pre-separator, a secondary baffle inside the tank body, a primary baffle between the secondary baffle and the oil-gas pre-separator, a primary coalescing packing layer, a secondary coalescing packing layer and a water outlet sequentially arranged between the oil-gas pre-separator and the primary baffle, a gas separator above the water outlet, a secondary oil outlet on the tank body located on the side away from the oil-gas pre-separator, and a primary oil outlet between the secondary baffle and the primary baffle.

[0009] The feed pipe adopts a tangential feeding method, which makes the raw material form a high-speed rotating vortex when entering the equipment. This not only enhances the contact effect with the various components inside the pipe, but also lays a good foundation for the subsequent separation process.

[0010] The feed pipe is equipped with a magnetic separator, a coarse filter and a flow stabilizer in sequence. The outside of the oil-gas pre-separator is equipped with a temperature control sleeve. The oil-gas pre-separator is connected to the liquid distributor through the oil-gas pre-separation vertical pipe.

[0011] The magnetic separator, installed at the front end of the feed pipe, uses high-strength magnets inside to create a powerful magnetic field that strongly attracts iron-containing impurities in the raw material, firmly adhering them to its surface and effectively preventing them from entering subsequent equipment. Following closely is a coarse filter, made of high-strength, corrosion-resistant material. Different pore sizes are designed to precisely intercept large particles of various sizes, such as silt and rust. After being processed by the magnetic separator and coarse filter, the raw material passes through a flow stabilizer for more stable and uniform flow, entering the oil-gas pre-separator at an appropriate speed and state. This series of components works in tandem, reducing the impact of impurities on the internal components and protecting subsequent separation parts, while also creating favorable conditions for efficient separation.

[0012] The oil-gas pre-separator performs initial separation of the incoming raw materials, reducing the pressure on subsequent separation. An external temperature control jacket regulates the temperature, optimizing the separation environment. The pre-separation riser connects to the distributor, ensuring uniform distribution of the initially separated fluid. Primary and secondary coalescing packing layers are sequentially arranged, causing oil and water droplets in the fluid to gradually coalesce and grow, facilitating subsequent separation and improving separation efficiency.

[0013] The tank is equipped with a gas connection pipe, and an air inlet baffle is located below the gas connection pipe. The gas connection pipe is located between the oil-gas pre-separator and the gas separator.

[0014] A sampling port is provided between the water outlet and the secondary coalescing packing layer, and a saddle support is provided at the bottom of the tank.

[0015] A hot water return port is provided below the secondary oil outlet. The other end of the hot water return port is located between the oil-gas pre-separation vertical pipe and the primary coalescing packing layer. A low liquid level alarm port is provided between the secondary oil outlet and the hot water return port, and a high liquid level alarm port is provided above the secondary oil outlet.

[0016] The gas separator is equipped with a cooling coil inside, and a perforated guide plate with an angled downward direction is connected to the cooling coil. A mist eliminator is located below the cooling coil.

[0017] The primary baffle is equipped with a movable perforated baffle. One end of the movable perforated baffle is inserted into the interior of the primary baffle, and the other end extends out of the tank and is connected to the oil-water interface regulator. The movable perforated baffle can move up and down and is equipped with an oil outlet hole.

[0018] The tank body is the main structure of the entire three-phase separator and is made of glass fiber composite material.

[0019] The saddle-type support beneath the tank is structurally robust and has a rationally distributed contact area with the tank, providing reliable support for the equipment. Whether during installation and commissioning or long-term operation, the saddle-type support ensures the tank maintains a stable posture, preventing separation effects caused by equipment swaying or tilting. Furthermore, the saddle-type support also possesses a certain degree of seismic resistance, effectively reducing damage to the tank during natural disasters such as earthquakes and ensuring the safe operation of the equipment.

[0020] The working principle of this utility model is as follows:

[0021] When the three-phase separator for oilfields with temperature control is in operation, the raw material first passes through the feed pipe, then sequentially through a magnetic separator to adsorb iron-containing impurities, a coarse filter to intercept large particles, and a flow stabilizer to stabilize the flow rate before entering the oil-gas pre-separator for preliminary separation. The fluid after preliminary separation flows into the distributor along the oil-gas pre-separation vertical pipe, thus being evenly distributed inside the tank. Next, as the fluid flows through the primary and secondary coalescing packing layers, the oil and water droplets gradually coalesce and grow, achieving further effective separation of oil, water, and gas. The separated gas phase enters the gas separator, where it is successively cooled by a cooling coil, guided by a perforated baffle, and precipitated by a mist eliminator to remove as many liquid droplets as possible before being discharged from the vent. The separated water phase is discharged from the water outlet, and the oil phase overflows from the oil outlet of the movable perforated baffle to the space between the primary and secondary baffles. Oil with heavier impurities is discharged from the primary oil outlet, while cleaner oil passes through the secondary baffle and is discharged from the secondary oil outlet. The two-stage overflow process ensures that the oil contains very low levels of impurities, meeting the required specifications.

[0022] The feed flow rate needs to be adjusted reasonably based on the actual oilfield production and the processing capacity of the three-phase separator, typically controlled at 70%-90% of the equipment's rated processing capacity. This ensures both full utilization of equipment efficiency and guaranteed separation effect. For temperature control, a temperature control sleeve on the outside of the oil-gas pre-separator maintains its internal temperature at 40℃-60℃. Liquid level control is crucial for stable equipment operation. The high-level alarm is set at 85% of the tank's total height, and the low-level alarm is set at 15%. An alarm is triggered promptly when the liquid level reaches the corresponding height, effectively preventing overflow or cavitation, ensuring the liquid level remains within a safe and stable range during operation, and guaranteeing the continuity and reliability of the entire three-phase separation process.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] (1) The magnetic separator and coarse filter installed in sequence on the feed pipe can effectively remove iron-containing impurities and large particles in the raw materials, reduce the wear and blockage of these impurities on the coalescing packing, and extend the service life of the coalescing packing. At the same time, the temperature control jacket on the outside of the oil-gas pre-separator can adjust the temperature according to the actual working conditions, reduce the impact of the large temperature difference between the inside and outside on the separation effect, and enable the equipment to operate stably under a wider range of temperature conditions.

[0025] (2) The cooling coil inside the gas separator can cool the gas phase, causing some of the liquid droplets in the gas phase to condense. The downward-sloping perforated guide plate helps to separate and collect the liquid droplets. The mist eliminator set below further captures the fine liquid droplets in the gas phase, greatly reducing the amount of liquid carried in the gas phase and improving the separation purity of the gas phase.

[0026] (3) The high-level alarm port and low-level alarm port on the tank can monitor the liquid level in the tank in real time. When the liquid level is abnormal, an alarm will be triggered in time to avoid overflow or evacuation, and to ensure the stable operation of the equipment. The oil-water interface regulator can be equipped with a level gauge, so that the operator can intuitively and accurately grasp the liquid level in the tank. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the three-phase separator for oilfields with temperature control function according to this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the movable perforated baffle of this utility model;

[0029] In the diagram: 1. Tank; 2. Feed pipe; 3. Oil-gas pre-separator; 4. Gas connection pipe; 5. Inlet baffle; 6. Oil-gas pre-separation vertical pipe; 7. Liquid distributor; 8. Primary coalescing packing layer; 9. Secondary coalescing packing layer; 10. Gas separator; 11. Mist eliminator; 12. Cooling coil; 13. Perforated guide plate; 14. Primary oil outlet; 15. Hot water return outlet; 16. Secondary oil outlet; 17. High liquid level alarm port; 18. Low liquid level alarm port; 19. Water outlet; 20. Oil-water interface regulator; 21. Gas vent; 22. Sampling port; 23. Saddle support; 24. Magnetic separator; 25. Coarse filter; 26. Flow stabilizer; 27. Temperature control sleeve; 28. Secondary baffle; 29. ​​Primary baffle; 30. Movable perforated baffle; 31. Oil outlet. Detailed Implementation

[0030] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] like Figure 1As shown, an oilfield three-phase separator with temperature control function includes a tank 1, an oil-gas pre-separator 3 on the tank 1, a feed pipe 2 connected to the oil-gas pre-separator 3, a secondary baffle 28 inside the tank 1, a primary baffle 29 between the secondary baffle 28 and the oil-gas pre-separator 3, a primary coalescing packing layer 8, a secondary coalescing packing layer 9 and a water outlet 19 sequentially arranged between the oil-gas pre-separator 3 and the primary baffle 29, a gas separator 10 above the water outlet 19, a secondary oil outlet 16 on the tank 1 located away from the oil-gas pre-separator 3, and a primary oil outlet 14 between the secondary baffle 28 and the primary baffle 29. A magnetic separator 24, a coarse filter 25 and a flow stabilizer 26 are sequentially arranged on the feed pipe 2, a temperature control sleeve 27 is provided on the outside of the oil-gas pre-separator 3, and the oil-gas pre-separator 3 is connected to a liquid distributor 7 through an oil-gas pre-separation vertical pipe 6. Tank 1 is equipped with a gas connection pipe 4, and an air inlet baffle 5 is located below the gas connection pipe 4. The gas connection pipe 4 is located between the oil-gas pre-separator 3 and the gas distribution manifold 10. A sampling port 22 is located between the water outlet 19 and the secondary coalescing packing layer 9. A saddle support 23 is located below the tank 1. The tank 1 is made of fiberglass, which has good corrosion resistance and can effectively resist corrosion from media such as oil, gas, and water, extending the service life of the equipment and reducing maintenance costs. The saddle support 23 at the bottom of the tank provides stable support for the equipment. A hot water return port 15 is located below the secondary oil outlet 16. The other end of the hot water return port 15 is located between the oil-gas pre-separation vertical pipe 6 and the primary coalescing packing layer 8. A low liquid level alarm port 18 is located between the secondary oil outlet 16 and the hot water return port 15. A high liquid level alarm port 17 is located above the secondary oil outlet 16. The air distribution manifold 10 has a cooling coil 12 inside, and a downward-sloping perforated guide plate 13 is connected to the cooling coil 12. A mist eliminator 11 is located below the cooling coil 12. Figure 2 As shown, a movable perforated baffle 30 is provided on the primary baffle 29. One end of the movable perforated baffle 30 is inserted into the interior of the primary baffle 29, and the other end extends out of the tank 1 and is connected to the oil-water interface regulator 20. The movable perforated baffle 30 can move up and down.

[0033] The above-mentioned three-phase separator for oilfields with temperature control function operates by including the following steps:

[0034] (1) Preliminary separation and uniform distribution stage: The raw material first passes through the feed pipe 2, and then passes through the magnetic separator 24 to adsorb iron-containing impurities, the coarse filter 25 to intercept large particles, and the flow stabilizer 26 to stabilize the flow rate before entering the oil-gas pre-separator 3 for preliminary separation. The fluid after preliminary separation flows into the distributor 7 through the oil-gas pre-separation vertical pipe 6, thus being evenly distributed inside the tank 1; (2) Further separation and discharge stage: Then, when the fluid flows through the primary coalescing packing layer 8 and the secondary coalescing packing layer 9, the oil droplets and water droplets gradually coalesce and grow, achieving further effective separation of oil, water and gas. The separated gas phase enters the gas separator 10, where it is cooled by the cooling coil 12, guided by the perforated guide plate 13, and captured by the mist eliminator 11. After removing as many droplets as possible from the gas phase, it is discharged from the gas vent 21. The separated water is discharged from the water outlet 19, and the oil phase overflows from the oil outlet 31 of the movable perforated baffle 30 to the space between the secondary baffle 28 and the primary baffle 29. The oil with heavier impurities is discharged from the primary oil outlet 14, and the cleaner oil overflows through the secondary baffle 28 and is discharged from the secondary oil outlet 16.

Claims

1. A three-phase separator for oilfields with temperature control function, characterized in that, The tank (1) is equipped with an oil-gas pre-separator (3) and a feed pipe (2) is connected to the oil-gas pre-separator (3). The tank (1) is equipped with a secondary baffle (28). A primary baffle (29) is provided between the secondary baffle (28) and the oil-gas pre-separator (3). A primary coalescing packing layer (8), a secondary coalescing packing layer (9) and a water outlet (19) are provided between the oil-gas pre-separator (3) and the primary baffle (29). A gas separator (10) is provided above the water outlet (19). A secondary oil outlet (16) is provided on the tank (1). The secondary oil outlet (16) is located on the side away from the oil-gas pre-separator (3). A primary oil outlet (14) is provided between the secondary baffle (28) and the primary baffle (29).

2. The three-phase separator for oilfields with temperature control function according to claim 1, characterized in that, The feed pipe (2) is provided with a magnetic iron remover (24), a coarse filter (25) and a flow stabilizer (26) in sequence. The outside of the oil-gas pre-separator (3) is provided with a temperature control sleeve (27). The oil-gas pre-separator (3) is connected to the liquid distributor (7) through the oil-gas pre-separation vertical pipe (6).

3. The three-phase separator for oilfields with temperature control function according to claim 1, characterized in that, The tank (1) is provided with a gas connection pipe (4), and an air inlet baffle (5) is provided below the gas connection pipe (4). The gas connection pipe (4) is located between the oil-gas pre-separator (3) and the gas separator (10).

4. The three-phase separator for oilfields with temperature control function according to claim 1, characterized in that, A sampling port (22) is provided between the outlet (19) and the secondary coalescing packing layer (9), and a saddle support (23) is provided below the tank body (1).

5. The three-phase separator for oilfields with temperature control function according to claim 2, characterized in that, Below the secondary oil outlet (16) is a hot water return port (15), and the other end of the hot water return port (15) is located between the oil-gas pre-separation vertical pipe (6) and the primary coalescing packing layer (8). A low liquid level alarm port (18) is provided between the secondary oil outlet (16) and the hot water return port (15), and a high liquid level alarm port (17) is provided above the secondary oil outlet (16).

6. The three-phase separator for oilfields with temperature control function according to claim 1, characterized in that, The gas distribution manifold (10) is equipped with a cooling coil (12) inside, and a perforated guide plate (13) with an angled downward direction is connected to the cooling coil (12). A mist eliminator (11) is provided below the cooling coil (12).

7. The three-phase separator for oilfields with temperature control function according to claim 1, characterized in that, The primary baffle (29) is provided with a movable perforated baffle (30). One end of the movable perforated baffle (30) is inserted into the interior of the primary baffle (29), and the other end extends out of the tank (1) and is connected to the oil-water interface regulator (20). The movable perforated baffle (30) can move up and down. The movable perforated baffle (30) is provided with an oil outlet hole (31).

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