Oil-water separation device

Abstract

The utility model relates to the technical field of oil and gas field exploitation processes, in particular to an oil-water separation device which comprises a separation tank and a buffer tank, the arrangement height of the buffer tank is lower than that of the separation tank, the bottom of the separation tank is connected with a first liquid discharge pipe, and the first liquid discharge pipe is communicated with the buffer tank. And a first valve is arranged on the first liquid discharge pipe. The condensate water is conveyed from the separation tank to the buffer tank without extra power, electric equipment in an oil and gas field production field is reduced, the risk of fire blast is reduced, the condensate water containing impurities does not need to be conveyed through a centrifugal pump, the frequency of faults is reduced, the condensate water is conveyed through gravity, the conveying process is smoother, and the conveying efficiency is improved. The phenomenon of overflowing of the buffer tank is reduced, a worker can conveniently and accurately control the conveying termination point of condensate water, and condensate oil entering the buffer tank is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field exploitation technology, and particularly relates to an oil-water separation device. Background Art

[0002] At present, during the exploitation of oil and gas fields, the production volume of formation water has been remaining high and will accompany the exploitation process of oil and gas wells for a long time. In the composition of the produced water, the ratios of condensate oil to condensate water are different. Since condensate oil contains a large amount of hydrocarbon compounds, these compounds are economic and environmentally friendly fuel sources and high-quality raw materials for the oil refining industry, with high economic value, while condensate water needs to be transported to a solidification plant for harmless treatment.

[0003] In the current process of separating condensate oil and condensate water, the pipeline and valve between a separation tank and a settling tank are connected, and a centrifugal pump is installed on the pipeline to separate condensate oil and condensate water. The separation process is as follows: the mixed liquid enters the station → the liquid is unloaded into the separation tank and left to stand → the pipeline valve is opened → the centrifugal pump is started → the lower-layer water is pumped to the buffer tank → the condensate water in the buffer tank is transported out to a hauling vehicle. Since the installation positions of the current separation tank and the buffer tank are at the same horizontal height, only when the water level in the separation tank is higher than that in the buffer tank, the connecting valve between the separation tank and the buffer tank is opened, and the condensate water in the separation tank will flow to the buffer tank. When the condensate water levels in the separation tank and the buffer tank are close, the condensate water in the separation tank will stop flowing to the buffer tank, and the centrifugal pump needs to be started to continue pumping the condensate water in the separation tank to the buffer tank for storage. If a power outage occurs, the oil-water separation cannot be carried out in time. In order to ensure the normal operation of the centrifugal pump, a generator needs to be equipped for the centrifugal pump. The deficiencies of the above-mentioned oil-water separation device and process are as follows:

[0004] 1. During the liquid discharge process, the centrifugal pump and the generator are used frequently, which is likely to cause explosion accidents during the production of oil and gas fields;

[0005] 2. There are relatively many impurities in condensate oil and condensate water, and the maintenance frequency of the centrifugal pump is high;

[0006] 3. The centrifugal pump pumps the lower-layer condensate water in the separation tank too fast, which is likely to pump out the condensate oil located in the upper layer of the separation tank, and secondary separation needs to be carried out in the buffer tank, and it is likely to cause the buffer tank to overflow.

[0007] Therefore, at present, a technical solution is needed to solve the technical problems of easy occurrence of explosion accidents, high maintenance frequency, overflow, and large pumping of condensate oil into the buffer tank during the separation process of condensate oil and condensate water when using a centrifugal pump as the conveying power. Content of the Utility Model

[0008] The purpose of the present utility model is to overcome the technical problems that in the process of separating condensate oil and condensate water, using a centrifugal pump as the conveying power is prone to explosion accidents, has a high maintenance frequency, overflows the tank, and pumps a large amount of condensate oil into the buffer tank, and to provide an oil-water separation device.

[0009] The present utility model provides an oil-water separation device, including a separation tank and a buffer tank. The installation height of the buffer tank is lower than that of the separation tank. A first drain pipe is connected to the bottom of the separation tank, and the first drain pipe communicates with the buffer tank. A first valve is arranged on the first drain pipe.

[0010] When the oil-water separation device of the present utility model is in use, after the mixed liquid enters the station → the liquid is unloaded into the separation tank and stands still → the first valve on the first drain pipe is opened → the bottom-layer condensate water enters the buffer tank under the action of gravity → the condensate water in the buffer tank is transported out to the transportation vehicle; the condensate water is transported from the separation tank to the buffer tank without the need for additional power, reducing the electrical equipment at the oil and gas field production site and reducing the risk of explosion. The condensate water containing impurities does not need to be transported by a centrifugal pump, reducing the frequency of failures. The condensate water is transported by gravity, and the transportation process is smoother, reducing the phenomenon of buffer tank overflow, facilitating the staff to accurately control the termination point of the condensate water transportation, and reducing the entry of condensate oil into the buffer tank.

[0011] Preferably, the height of the top of the buffer tank is less than or equal to the height of the bottom of the separation tank.

[0012] So that the condensate water in the lower layer of the separation tank can be more fully discharged into the buffer tank, reducing the residue of condensate water in the separation tank and improving the purity of the condensate oil.

[0013] Preferably, it further includes a spare tank. The installation height of the spare tank is lower than that of the buffer tank. A second drain pipe is connected to the bottom of the buffer tank, and the second drain pipe communicates with the spare tank. A second valve is arranged on the second drain pipe.

[0014] When there is too much condensate oil in the buffer tank, after static separation in the buffer tank, the condensate water can be discharged into the spare tank through the second drain pipe, avoiding waste of condensate oil caused by direct discharge.

[0015] Preferably, the height of the top of the spare tank is less than or equal to the height of the bottom of the buffer tank.

[0016] So that the condensate water in the lower layer of the buffer tank can be more fully discharged into the spare tank, reducing the residue of condensate water in the buffer tank and improving the purity of the condensate oil.

[0017] Preferably, an overflow pipe is connected to the top of the buffer tank, and the overflow pipe communicates with the spare tank.

[0018] The buffer tank needs to continuously receive the condensate water from the separation tank. When the loading amount exceeds the rated capacity of the buffer tank or the liquid discharge speed is too fast, the buffer tank will overflow. By connecting an overflow pipe to the top of the buffer tank, when the liquid level in the buffer tank reaches the height of the overflow pipe, the condensate oil or / and condensate water will enter the standby tank through the overflow pipe, avoiding the waste of condensate oil caused by overflow.

[0019] Preferably, a reflux pipe is connected to the bottom of the standby tank, and the reflux pipe is communicated with the separation tank. A third valve and a centrifugal pump are arranged on the reflux pipe.

[0020] When the buffer tank overflows or the second drain pipe introduces the condensate oil into the standby tank, there will be a certain amount of condensate oil in the standby tank. A reflux pipe is connected between the standby tank and the separation tank, and the condensate liquid in the standby tank is pumped into the separation tank by a centrifugal pump, facilitating the secondary separation of the condensate liquid and avoiding the waste of condensate oil.

[0021] Preferably, it further includes a base. A first tabletop, a second tabletop, and a third tabletop are arranged in sequence on the base. The height of the third tabletop is lower than that of the second tabletop, and the height of the second tabletop is lower than that of the first tabletop. The separation tank is arranged on the first tabletop, the buffer tank is arranged on the second tabletop, and the standby tank is arranged on the third tabletop.

[0022] By setting the base and arranging the first tabletop, the second tabletop, and the third tabletop with sequential heights on the base, which are respectively used to place the separation tank, the buffer tank, and the standby tank, the installation method of the separation tank, the buffer tank, and the standby tank from high to low is realized, facilitating the liquid flow between the separation tank and the buffer tank and between the buffer tank and the standby tank.

[0023] Preferably, the first tabletop, the second tabletop, and the third tabletop are respectively provided with arc-shaped grooves for installing the separation tank, the buffer tank, and the standby tank.

[0024] Make the installation of the separation tank, the buffer tank, and the standby tank more stable.

[0025] Preferably, it further includes a base. The base is arranged on the base, and the base is provided with a dirt accumulation pool, and the height of the dirt accumulation pool is lower than that of the third tabletop.

[0026] When the separation tank, the buffer tank, and the standby tank overflow, the overflowed condensate liquid will flow through the base onto the base and then into the dirt accumulation pool, avoiding environmental pollution. At the same time, it is also convenient to centrally process the overflowed condensate liquid and reduce resource waste.

[0027] Compared with the prior art, the beneficial effects of the present utility model:

[0028] 1. The utility model provides an oil-water separation device, which discharges condensate water by using the height difference between a separation tank and a buffer tank, without the need to additionally add an electric device, reducing the risk of combustion and explosion at the oil and gas field production site;

[0029] 2. The utility model provides an oil-water separation device, which conveys condensate water by using gravity, reducing energy consumption and production costs;

[0030] 3. The utility model provides an oil-water separation device, in which condensate water enters the buffer tank from the separation tank under the action of gravity, and the process is smoother, facilitating control and reducing the pumping of condensate oil into the buffer tank caused by misoperation;

[0031] 4. The utility model provides an oil-water separation device, in which the condensate water containing impurities does not require a centrifugal pump to provide power from the separation tank to the buffer tank, avoiding the problem of centrifugal pump failure caused by impurities and reducing the maintenance frequency of the drain pipeline. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of an oil-water separation device of the utility model;

[0033] Figure 2 is a schematic structural diagram of the base of the utility model;

[0034] Markings in the figure:

[0035] 1 - separation tank, 2 - buffer tank, 3 - first drain pipe, 31 - first valve, 4 - spare tank, 5 - second drain pipe, 51 - second valve, 6 - base, 61 - first tabletop, 62 - second tabletop, 63 - third tabletop, 64 - arc-shaped groove, 7 - return pipe, 71 - third valve, 72 - centrifugal pump, 8 - base, 81 - dirt collection pool, 9 - overflow pipe, 91 - fourth valve. Detailed Embodiments

[0036] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0037] Unless otherwise specified, in the description of the specific embodiments of the present utility model, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / equipment of the present utility model is commonly used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0038] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present utility model.

[0039] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of a specific component.

[0040] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be more than 9.

[0041] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / limited, where terms such as "set", "installed", "connected", "connected", "provided with", "laid", "arranged" appear, they 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 connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This kind of connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0042] Example 1

[0043] As Figure 1 and Figure 2 shown, an oil-water separation device includes a separation tank 1 and a buffer tank 2. The installation height of the buffer tank 2 is lower than that of the separation tank 1. A first drain pipe 3 is connected to the bottom of the separation tank 1, and the first drain pipe 3 communicates with the buffer tank 2. A first valve 31 is arranged on the first drain pipe 3.

[0044] During use, after the mixed liquid enters the station → unload the liquid into the separation tank 1 and let it stand → open the first valve 31 on the first drain pipe 3 → the bottom layer of condensate water enters the buffer tank 2 under the action of gravity → the condensate water in the buffer tank 2 is transported out to the transportation vehicle; the condensate water is transported from the separation tank 1 to the buffer tank 2 without the need for additional power, reducing the electrical equipment at the oil and gas field production site and reducing the risk of combustion and explosion. The condensate water containing impurities does not need to be transported by a centrifugal pump, reducing the frequency of failures. Using gravity to transport the condensate water, the transportation process is smoother, reducing the phenomenon of overflow in the buffer tank 2, facilitating the staff to accurately control the end point of the condensate water transportation, and reducing the entry of condensate oil into the buffer tank 2.

[0045] Buffer tank 2: The height of the top of the buffer tank 2 is less than or equal to the height of the bottom of the separation tank 1. One end of the first drain pipe 3 is connected to the bottom of the separation pipe 1, and the other end is connected to the top of the buffer tank 2, so that the condensate water in the lower layer of the separation tank 1 can be more fully discharged into the buffer tank 2, reducing the residue of condensate water in the separation tank 1 and improving the purity of the condensate oil.

[0046] Example 2

[0047] As Figure 1 and Figure 2 shown, in this embodiment, the difference from Example 1 is that the oil-water separation device further includes a spare tank 4. The installation height of the spare tank 4 is lower than that of the buffer tank 2. A second drain pipe 5 is connected to the bottom of the buffer tank 2, and the second drain pipe 5 communicates with the spare tank 4. A second valve 51 is arranged on the second drain pipe 5.

[0048] In this embodiment, when there is too much condensate oil in the buffer tank 2, after static separation in the buffer tank 2, the condensate water can be discharged into the spare tank 4 through the second drain pipe 5 to avoid waste of condensate oil caused by direct discharge.

[0049] Spare tank 4: The height of the top of the spare tank 4 is less than or equal to the height of the bottom of the buffer tank 2. One end of the second drain pipe 5 is connected to the bottom of the buffer tank 2, and the other end is connected to the top of the spare tank 4, so that the condensate water in the lower layer of the buffer tank 2 can be more fully discharged into the spare tank 4, reducing the residue of condensate water in the buffer tank 2 and improving the purity of the condensate oil.

[0050] Furthermore, a dedicated base 6 is provided for the above-mentioned separation tank 1, buffer tank 2 and spare tank 4. A first tabletop 61, a second tabletop 62 and a third tabletop 63 are arranged in sequence on the base 6. The height of the third tabletop 63 is lower than that of the second tabletop 62, and the height of the second tabletop 62 is lower than that of the first tabletop 61. The separation tank 1 is arranged on the first tabletop 61, the buffer tank 2 is arranged on the second tabletop 62, and the spare tank 4 is arranged on the third tabletop 63, realizing the installation method of the separation tank 1, buffer tank 2 and spare tank 4 from high to low, so as to facilitate the liquid flow between the separation tank 1 and the buffer tank 2 and between the buffer tank 2 and the spare tank 4; furthermore, arc-shaped grooves 64 are respectively provided on the first tabletop 61, the second tabletop 62 and the third tabletop 63 for installing the separation tank 1, the buffer tank 2 and the spare tank 4 respectively, and holes for pipelines to pass through are provided on the side walls of the arc-shaped grooves 64.

[0051] Embodiment 3

[0052] As Figure 1 shown, in this embodiment, the difference from Embodiment 2 is that an overflow pipe 9 is connected to the top of the buffer tank 2, and the overflow pipe 9 communicates with the top of the spare tank 4.

[0053] In this embodiment, the buffer tank 2 needs to continuously receive condensate water from the separation tank 1. When the loading amount exceeds the rated load of the buffer tank 2 or the liquid discharge speed is too fast, the buffer tank 2 will overflow. By connecting the overflow pipe 9 to the top of the buffer tank 2, when the liquid level in the buffer tank 2 reaches the height of the overflow pipe 9, the condensate oil or / and condensate water will enter the spare tank 4 through the overflow pipe 9, avoiding the waste of condensate oil caused by overflow.

[0054] Embodiment 4

[0055] As Figure 1 shown, in this embodiment, the difference from Embodiment 2 is that a return pipe 7 is connected to the bottom of the spare tank 4, the return pipe 7 communicates with the separation tank 1, and a third valve 71 and a centrifugal pump 72 are arranged on the return pipe 7.

[0056] In this embodiment, when the buffer tank 2 overflows, or when the second drain pipe 5 introduces condensate oil into the spare tank 4, there will be a certain amount of condensate oil in the spare tank 4. A return pipe 7 is connected between the spare tank 4 and the separation tank 1, and the condensate liquid in the spare tank 4 is pumped into the separation tank 1 through the centrifugal pump 72, facilitating the secondary separation of the condensate liquid and avoiding the waste of condensate oil.

[0057] Embodiment 5

[0058] As Figure 1As shown in the figure, in this embodiment, the difference from Embodiment 2 is that it further includes a base 8, the pedestal 6 is arranged on the base 8, the base 8 is provided with a dirt accumulation pool 81, and the height of the dirt accumulation pool 81 is set lower than the third tabletop 63.

[0059] In this embodiment, when the separation tank 1, the buffer tank 2, and the spare tank 4 experience overflow, the overflowing condensate will flow through the pedestal 6 onto the base 8 and then into the dirt accumulation pool 81, avoiding environmental pollution. At the same time, it is also convenient to centrally process the overflowing condensate and reduce waste of resources.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An oil-water separation device, characterized in that: The invention comprises a separation tank (1) and a buffer tank (2), wherein the buffer tank (2) is arranged at a lower height than the separation tank (1), a first liquid discharge pipe (3) is connected to the bottom of the separation tank (1), the first liquid discharge pipe (3) is communicated with the buffer tank (2), and a first valve (31) is arranged on the first liquid discharge pipe (3).

2. The oil-water separation device according to claim 1, characterized in that: The height of the top of the buffer tank (2) is less than or equal to the height of the bottom of the separation tank (1).

3. The oil-water separation device according to claim 1, characterized in that: It also comprises a spare tank (4), the arrangement height of the spare tank (4) being lower than that of the buffer tank (2), the bottom of the buffer tank (2) being connected to a second liquid discharge pipe (5), the second liquid discharge pipe (5) being in communication with the spare tank (4), and a second valve (51) being arranged on the second liquid discharge pipe (5).

4. The oil-water separation device according to claim 3, characterized in that: The height of the top of the standby tank (4) is less than or equal to the height of the bottom of the buffer tank (2).

5. The oil-water separation device according to claim 3, characterized in that: The top of the buffer tank (2) is connected to an overflow pipe (9), and the overflow pipe (9) is in communication with the standby tank (4).

6. The oil-water separation device according to claim 3, characterized in that: The bottom of the standby tank (4) is connected to a reflux pipe (7), the reflux pipe (7) is in communication with the separation tank (1), and a third valve (71) and a centrifugal pump (72) are provided on the reflux pipe (7).

7. An oil-water separation device according to any one of claims 3 to 6, characterized in that: The invention also comprises a base (6), wherein a first table top (61), a second table top (62) and a third table top (63) are arranged in sequence on the base (6), the third table top (63) is arranged at a height lower than the second table top (62), the second table top (62) is arranged at a height lower than the first table top (61), the separation tank (1) is arranged on the first table top (61), the buffer tank (2) is arranged on the second table top (62), and the standby tank (4) is arranged on the third table top (63).

8. The oil-water separation device according to claim 7, characterized in that: The first table top (61), the second table top (62) and the third table top (63) are respectively provided with arc-shaped grooves (64) for mounting the separation tank (1), the buffer tank (2) and the standby tank (4).

9. The oil-water separation device according to claim 7, characterized in that: It also comprises a base (8), the base (6) being arranged on the base (8), the base (8) being provided with a dirt collection tank (81), the dirt collection tank (81) being arranged at a height lower than the third table top (63).

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