Tandem type oil-water rapid separation device for crude oil

Abstract

The utility model discloses a tandem type oil-water rapid separation device for crude oil, which comprises a buffer tank, a vertical three-phase separator, a horizontal three-phase separator, an oil storage tank and a peripheral well site Christmas tree, a water weir plate is arranged in the vertical three-phase separator, and the height of the water weir plate is 23-28cm. The water weir plate of the vertical three-phase separator is adjusted to a proper height, so that an effective'water cushion layer 'is established, and oil-water separation can be effectively carried out on liquid coming from a well site twice. The tandem type oil-water rapid separation device for the crude oil is suitable for the crude oil treatment and sale process of a small crude oil gathering and transportation station, effective and rapid separation of the oil and water of the crude oil is achieved, the water content of the crude oil can be controlled to be 1% or below, the daily average oil sale quantity is also increased to 92.02 t from 77.47 t, the amplification reaches up to 18.8%, and the water content of the crude oil, the oil-water separation time and the crude oil loss are effectively reduced.

Description

Technical Field

[0001] The utility model relates to crude oil processing equipment, more specifically, to a series type crude oil and water rapid separation device. Background Art

[0002] A typical characteristic of small oil gathering stations is that the daily liquid volume they process far exceeds their tank capacity. This requires the station to rapidly separate incoming liquid from the well site, ensuring that the crude oil's water content meets the required standards quickly to alleviate operational pressure. Currently, most oil gathering stations use a parallel three-phase separator system to separate oil, gas, and water. This separation process has the following drawbacks: First, the crude oil is processed in only one separator, and the water content at the oil phase outlet is typically over 2%, resulting in poor separation efficiency; second, the three-phase separators are often used in parallel, which can easily cause fluid flow deviation and make it difficult to control the oil-water chamber level; third, the oil phase that does not meet the water content standard must be further separated in a settling tank, which seriously affects oil sales efficiency; and fourth, tank trucks accumulate in the station area while waiting to discharge oil, increasing operational safety and environmental risks. Utility Model Content

[0003] Based on this, it is necessary to provide a series crude oil and water rapid separation device to address the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A series type crude oil oil-water rapid separation device is characterized in that the series type crude oil oil-water rapid separation device comprises a buffer tank, a vertical three-phase separator, a horizontal three-phase separator, an oil storage tank and a peripheral well site Christmas tree,

[0006] The buffer tank is connected to the vertical three-phase separator through a first pipeline, the vertical three-phase separator is connected to the horizontal three-phase separator through a second pipeline, and the horizontal three-phase separator is connected to the oil storage tank through a third pipeline.

[0007] The first pipeline is provided with a buffer tank outlet gate, an oil pump, an oil pump outlet gate and a vertical three-phase separator inlet gate.

[0008] The second pipeline is provided with a vertical three-phase separator oil outlet bypass gate and a horizontal three-phase separator inlet gate.

[0009] The third pipeline is provided with a horizontal three-phase separator oil outlet gate and an oil tank inlet gate.

[0010] The Christmas tree at the peripheral well site is connected to the inlet of the vertical three-phase separator inlet gate through the Christmas tree outlet bypass gate, and the Christmas tree at the peripheral well site is connected to the inlet of the horizontal three-phase separator inlet gate through the Christmas tree outlet gate. The outlet of the oil storage tank is provided with an oil storage tank outlet gate, a sales pump and a tanker inlet gate.

[0011] Wherein, an oil tank inlet bypass gate is provided between the inlet of the oil tank inlet gate and the outlet of the oil tank outlet gate.

[0012] As a preferred embodiment of the present invention, the oil pump is a centrifugal pump.

[0013] As a preferred embodiment of the present invention, the oil pump outlet gate and the Christmas tree outlet bypass gate are check valves.

[0014] As a preferred embodiment of the present invention, a water weir plate is provided in the vertical three-phase separator, and the height of the water weir plate is 23 to 28 cm.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model provides a series-type crude oil oil-water rapid separation device, which is suitable for the crude oil processing and sales process of small crude oil gathering and transportation stations. It realizes the effective and rapid separation of crude oil and water, and can control the water content of crude oil to below 1%. The average daily oil sales volume is also increased from 77.47t to 92.02t, an increase of up to 18.8%. It realizes the effective reduction of the water content of crude oil, the oil-water separation time and the crude oil loss, and solves the production practice of employees frequently pressing the bottom water of oil storage tanks before the transformation, reduces the labor intensity of employees, and achieves the purpose of improving quality and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the solutions in the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a structural diagram of a serial crude oil-water rapid separation device of the present utility model;

[0019] Figure 2 for Figure 1 The comparison chart of the use effect of the series crude oil and water rapid separation device shows the relationship between different water weir plate heights and the water content percentage at the oil phase outlet of the vertical three-phase separator and the horizontal three-phase separator;

[0020] The markings in the figure are as follows: 1. Buffer tank; 10. Christmas tree at the peripheral well site; 11. Christmas tree outlet gate at the peripheral well site; 12. Horizontal three-phase separator oil outlet gate; 13. Oil storage tank inlet gate; 14. Oil storage tank; 16. Tank truck inlet gate; 17. Sales pump; 18. Oil storage tank outlet gate; 19. Christmas tree outlet bypass gate; 2. Buffer tank outlet gate; 20. Vertical three-phase separator oil outlet bypass gate; 3. Oil pump; 4. Oil pump outlet gate; 5. Vertical three-phase separator inlet gate; 6. Vertical three-phase separator; 61. Water weir plate; 8. Horizontal three-phase separator inlet gate; 9. Horizontal three-phase separator; P1, first pipeline; P2, second pipeline; P3, third pipeline. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] like Figure 1 As shown, the serial crude oil-water rapid separation device comprises a buffer tank 1, a vertical three-phase separator 6, a horizontal three-phase separator 9, an oil storage tank 14 and a peripheral well site Christmas tree 10.

[0023] The buffer tank 1 is connected to the vertical three-phase separator 6 via a first pipe P1, the vertical three-phase separator 6 is connected to the horizontal three-phase separator 9 via a second pipe P2, and the horizontal three-phase separator 9 is connected to the oil storage tank 14 via a third pipe P3.

[0024] The first pipeline P1 is provided with a buffer tank outlet gate 2, an oil pump 3, an oil pump outlet gate 4 and a vertical three-phase separator inlet gate 5.

[0025] The second pipeline P2 is provided with a vertical three-phase separator oil outlet bypass gate 20 and a horizontal three-phase separator inlet gate 8.

[0026] The third pipeline P3 is provided with a horizontal three-phase separator oil outlet gate 12 and an oil storage tank inlet gate 13.

[0027] In addition, the peripheral well site Christmas tree 10 is connected to the inlet of the vertical three-phase separator inlet gate 5 through the Christmas tree outlet bypass gate 19, and the peripheral well site Christmas tree 10 is connected to the inlet of the horizontal three-phase separator inlet gate 8 through the peripheral well site Christmas tree outlet gate 11.

[0028] In addition, the outlet of the oil storage tank 14 is provided with an oil storage tank outlet gate 18, a sales pump 17 and a tanker truck inlet gate 16. Through the sales pump 17, crude oil can be pumped into the tanker truck 15 to complete the sale.

[0029] In addition, an oil tank inlet bypass gate 21 is provided between the inlet of the oil tank inlet gate 13 and the outlet of the oil tank outlet gate 18 .

[0030] It should be noted that the oil pump 3 is a centrifugal pump. The oil pump outlet gate 4 and the Christmas tree outlet bypass gate 19 are check valves.

[0031] The vertical three-phase separator 6 is provided with a water weir plate 61 , and the height of the water weir plate 61 is 23 to 28 cm.

[0032] The working mode of the serial crude oil-water rapid separation device is described below.

[0033] The Christmas tree 10 at the peripheral well site is connected to the inlet gate 5 of the vertical three-phase separator through an oil pipeline. The water weir 61 of the vertical three-phase separator 6 is adjusted to 23-28 cm to establish an effective "water cushion" for the oil phase at the outlet of the vertical three-phase separator, allowing the crude oil and water to undergo a primary separation.

[0034] Then, the vertical three-phase separator oil outlet bypass gate 20 is connected to the horizontal three-phase separator inlet gate 8, so that the crude oil and water undergo secondary separation.

[0035] Finally, the horizontal three-phase separator oil outlet gate 12 is connected to the oil storage tank inlet bypass gate 21, and the oil is pumped into the tanker 15 through the sales pump 17 to complete the sales.

[0036] like Figure 2 As shown, the relationship between the height of different water weir plates 61 and the water content percentage at the oil phase outlet of the vertical three-phase separator 6 and the horizontal three-phase separator 9 is shown.

[0037] The experiment controlled the water content of the oil phase outlet of the vertical separator 6 by adjusting the height of the water weir plate 61 of the vertical separator 6. The height of the water weir plate 61 was adjusted to 13 cm, 18 cm, 23 cm, 28 cm and 33 cm respectively. The experimental results are shown in Figure 2. Figure 2 As shown in the figure, the results show that as the height of the water weir increases, the water content at the oil phase outlet of vertical separator 6 gradually increases, reaching 5%, 6.5%, 8.3%, 10.9%, and 13.8%, respectively. In contrast, the water content at the oil phase outlet of horizontal separator 9 first decreases and then increases, reaching 37.6%, 21.2%, 0.8%, 0.5%, and 0.9%, respectively. Furthermore, when the height of water weir 61 is 13 cm and 18 cm, oil is clearly visible at the water phase outlet of horizontal separator 9.

[0038] The reason is that the water content of the oil phase at the outlet of vertical separator 6 is too low, and the oil phase cannot form a clear "water cushion." As a result, after this low-water oil phase enters horizontal separator 9, the horizontal separator 9 cannot determine a reasonable oil-water interface, resulting in a disordered oil-water path and oil escaping through the water path. Therefore, adjusting the water weir plate 61 of vertical separator 6 to 23-28 cm and maintaining a water content of approximately 8% to 10% at the oil phase outlet of vertical separator 6 is the key to effective secondary oil-water separation.

[0039] Compared with the traditional parallel separation mode of three-phase separators, this series crude oil and water rapid separation device connects the oil outlet of one three-phase separator to the liquid inlet of another three-phase separator, adjusts the water weir plate of the vertical three-phase separator to the appropriate height, and thus establishes an effective "water cushion layer". The fluid from the well site can undergo two effective oil-water separations.

[0040] By retrofitting two three-phase separators in series and adjusting the height of the vertical three-phase separator's water weir plate to maintain a water content of approximately 8% to 10% at the vertical separator's oil phase outlet, the incoming crude oil undergoes two oil-water separations, effectively reducing the water content of the separated crude oil and avoiding the problem of liquid flow bias caused by the parallel operation of three-phase separators. Furthermore, the crude oil's water content after two separations is fully qualified, requiring no further tank settling. This significantly reduces the time required for oil-water separation, significantly increasing average daily oil sales and reducing safety and environmental risks during the operation of oil sales vehicles.

[0041] The serial crude oil and water rapid separation device is suitable for the crude oil processing and sales process of small crude oil gathering and transportation stations. It realizes the effective and rapid separation of crude oil and water, and can control the water content of crude oil to below 1%. The average daily oil sales volume has also increased from 77.47t to 92.02t, an increase of 18.8%. It has achieved effective reductions in the water content of crude oil, oil-water separation time and crude oil loss. It also solves the production practice of employees frequently pressing the bottom water of oil storage tanks before the transformation, reduces the labor intensity of employees, and achieves the purpose of improving quality and efficiency.

[0042] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A series type crude oil and water rapid separation device, characterized in that: The serial crude oil-water rapid separation device comprises a buffer tank (1), a vertical three-phase separator (6), a horizontal three-phase separator (9), an oil storage tank (14) and a peripheral well site Christmas tree (10). The buffer tank (1) is connected to the vertical three-phase separator (6) through a first pipe (P1), the vertical three-phase separator (6) is connected to the horizontal three-phase separator (9) through a second pipe (P2), and the horizontal three-phase separator (9) is connected to the oil storage tank (14) through a third pipe (P3). The first pipeline (P1) is provided with a buffer tank outlet gate (2), an oil pump (3), an oil pump outlet gate (4) and a vertical three-phase separator inlet gate (5). The second pipeline (P2) is provided with a vertical three-phase separator oil outlet bypass gate (20) and a horizontal three-phase separator inlet gate (8). The third pipeline (P3) is provided with a horizontal three-phase separator oil outlet gate (12) and an oil storage tank inlet gate (13). The peripheral well site Christmas tree (10) is connected to the inlet of the vertical three-phase separator inlet gate (5) through the Christmas tree outlet bypass gate (19), and the peripheral well site Christmas tree (10) is connected to the inlet of the horizontal three-phase separator inlet gate (8) through the peripheral well site Christmas tree outlet gate (11). The outlet of the oil storage tank (14) is provided with an oil storage tank outlet gate (18), a sales pump (17) and an oil tanker inlet gate (16). Wherein, an oil tank inlet bypass gate (21) is provided between the inlet of the oil tank inlet gate (13) and the outlet of the oil tank outlet gate (18).

2. The serial crude oil-water rapid separation device according to claim 1, characterized in that: The oil pump (3) is a centrifugal pump.

3. The serial crude oil-water rapid separation device according to claim 1, characterized in that: The oil pump outlet gate (4) and the Christmas tree outlet bypass gate (19) are check valves.

4. The serial crude oil-water rapid separation device according to claim 1, characterized in that: The vertical three-phase separator (6) is provided with a water weir plate (61), and the height of the water weir plate (61) is 23 to 28 cm.

Images