A shale oil well site vertical oil-gas-water treatment integrated device

Abstract

The utility model relates to shale oil well site vertical oil-gas-water treatment integrated device relates to shale oil small well site high -efficient dewatering technical field, including vertical oil-gas-water treatment container, one side of vertical oil-gas-water treatment container upper end is equipped with shale oil produced liquid import, and the other side of vertical oil-gas-water treatment container upper end is equipped with purified shale oil export, vertical oil-gas-water treatment container is equipped with baffle in, the top of baffle is provided with lift pipe, the bottom of baffle center is connected with downcomer, and the bottom of downcomer is connected with liquid distribution pipe, baffle with liquid distribution pipe between be equipped with cylindrical electrode and tubular electrode plate, cylindrical electrode fixed mounting in tubular electrode plate, and cylindrical electrode with tubular electrode plate between be equipped with electric field flow channel, the utility model through the effect of non-uniform strong electric field to crude oil dewatering, realize shale oil produced liquid treatment device small -sized, short -process, skid -mounted requirement, and one skid realizes oil-gas-water separation, and completes shale oil high -efficient, stable dewatering treatment.

Description

Technical Field

[0001] This invention relates to the field of efficient dehydration technology for small shale oil well sites, specifically to a vertical integrated oil, gas and water treatment device for shale oil well sites. Background Technology

[0002] In the early stages of shale oil production, individual shale oil wells or well groups are relatively independent and far from existing pipeline networks. New pipelines face challenges due to land constraints, making construction difficult and time-consuming, and failing to meet the production cycle requirements of shale oil development. Furthermore, the initial production of shale oil produces a large amount of fracturing flowback fluid. After the flowback period, some shale oil in certain blocks exhibits challenges such as small droplet size, high emulsification, and difficulty in dehydration. Directly transporting the shale oil produced fluid to existing integrated treatment plants would disrupt their operation and affect normal production. Therefore, it is necessary to perform efficient on-site dehydration treatment on such shale oil produced fluids before selling the purified shale oil.

[0003] Existing high-efficiency dehydration equipment for on-site treatment of shale oil produced fluids is all horizontal equipment, and the equipment is designed for a large processing capacity (typically a single unit with a processing capacity of ≥500m³). 3 The existing shale oil dehydration equipment ( / d) is relatively large in volume and has a long residence time. For shale oil well groups with low production rates or rapid deceleration rates, there is often a redundancy in equipment processing capacity. Therefore, based on the characteristics of shale oil development, a miniaturized, highly adaptable, high-field-strength, and shorter-time-through-electric-field high-efficiency dehydration device needs to be developed to meet the production requirements of shale oil development. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, the present invention aims to provide a vertical integrated oil, gas and water treatment device for shale oil well sites. This device solves the problem that existing high-efficiency dehydration equipment for on-site treatment of shale oil produced fluid is mostly horizontal, with large individual equipment design capacity, relatively large equipment volume, and long residence time. For shale oil well groups with low production or rapid deceleration rate, there is often a problem of redundant equipment processing capacity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A vertical integrated oil, gas, and water treatment device for shale oil well sites includes a vertical oil, gas, and water treatment container. A shale oil produced fluid inlet is located on one side of the upper end of the container. This inlet is connected to the gas phase space inside the container via a produced fluid inlet pipe. The produced fluid inlet pipe penetrates the side wall of the container, and an anti-surge plate is installed on the inner side of the container wall where the pipe connects. A purified shale oil outlet is located on the other side of the upper end of the container. An air vent is located at the top of the vertical oil, gas, and water treatment container. The vertical oil, gas and water treatment container has an inlet and an associated gas outlet, and a liquid discharge outlet and a produced water outlet at the bottom. A baffle is installed inside the container, with the shale oil produced fluid inlet located at the upper end of the baffle and the purified shale oil outlet located at the lower end. A gas riser is installed on the top surface of the baffle, and a wire mesh demister is installed above the gas riser. A downcomer is connected to the bottom center of the baffle, and a distribution pipe is connected to the bottom of the downcomer. A cylindrical electrode and a tubular electrode plate are installed between the baffle and the distribution pipe. The cylindrical electrode is fixedly installed inside the tubular electrode plate, and an electric field channel is provided between the cylindrical electrode and the tubular electrode plate.

[0006] Preferably, the vertical oil, gas and water treatment container is equipped with a level gauge, an interface meter, and a remote pressure gauge; the purified shale oil outlet pipeline is equipped with a purified shale oil outlet electric regulating valve, which is interlocked with the level gauge; the produced water outlet pipeline is equipped with a produced water outlet electric regulating valve, which is interlocked with the interface meter; the associated gas outlet pipeline is equipped with an associated gas outlet electric regulating valve, which is interlocked with a remote pressure gauge in the gas phase space.

[0007] Preferably, a container safety valve is provided on the pipeline of the vent outlet.

[0008] Preferably, the top of the air riser is provided with a brim-type liquid baffle.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention completes the dehydration of crude oil through a non-uniform cylindrical strong electric field, realizing the requirements of miniaturization, short process and skid-mounted operation of shale oil produced fluid treatment device, achieving oil-gas-water separation with one skid, and completing efficient and stable dehydration treatment of shale oil with small oil droplet size, high degree of emulsification and high dehydration difficulty. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the produced fluid inlet of the present invention.

[0012] Explanation of reference numerals in the attached figures: 1-Vertical oil, gas and water treatment container; 2-Wire mesh demister; 3-Downcomer; 4-Distribution pipe; 5-Electric field channel; 6-Cylindrical electrode; 7-Tubular electrode plate; 8-Gas riser; 9-Level gauge; 10-Interface meter; 11-Remote pressure gauge; 12-Purified shale oil outlet electric regulating valve; 13-Produced water outlet electric regulating valve; 14-Associated gas outlet electric regulating valve; 15-Container safety valve; 16-Shale oil produced fluid inlet; 17-Purified shale oil outlet; 18-Produced water outlet; 19-Associated gas outlet; 20-Air vent outlet; 21-Drainage outlet; 22-Produced fluid inlet pipe; 23-Anti-surge plate. Detailed Implementation

[0013] The invention will now be described in detail with reference to the accompanying drawings and examples. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments.

[0014] like Figures 1 to 2 As shown, this invention discloses a vertical integrated oil, gas and water treatment device for shale oil well sites. Shale oil produced fluid inlet 16 enters the vertical oil, gas and water treatment container 1. Gas-liquid separation is first performed in the upper gas phase space of the vertical oil, gas and water treatment container 1. The produced fluid inlet pipe 22 is connected to the side wall of the vertical oil, gas and water treatment container 1 to form a vortex and realize gas-liquid separation. The produced fluid inlet pipe 22 is connected to the inner wall of the container and is equipped with an anti-impact plate 23. After the produced fluid is sprayed into the container, it protects the inner wall of the container and ensures the service life of the container. The separated gas passes through the wire mesh demister 2 and then exits the device to enter the associated gas system. An associated gas outlet electric regulating valve 14 is installed on the pipeline of the associated gas outlet 19. The associated gas outlet electric regulating valve 14 is interlocked with the remote pressure gauge 11 on the gas phase space of the vertical oil, gas and water treatment container 1 to control the operating pressure of the vertical oil, gas and water treatment container 1.

[0015] After gas-liquid separation, the liquid phase falls onto the funnel-shaped baffle, then flows through the downcomer 3 to the distribution pipe 4 at the bottom of the vertical oil-gas-water treatment container 1. After being evenly distributed through the distribution pipe 4, the liquid flows upward through the electric field channel 5. Within the electric field channel 5, a gradient non-uniform strong electric field is formed between the cylindrical electrode 6 and the tubular electrode 7, centered on the cylindrical electrode 6. Under the action of the strong electric field, the shale oil produced fluid is rapidly demulsified, water droplets coalesce, and oil-water separation is completed. The purified shale oil, after being treated by the electric field, flows out of the electric field area from the top and goes to the station's purification oil system through the purified shale oil outlet 17. The shale oil outlet flow rate is controlled by the purified shale oil outlet electric regulating valve 12 interlocked with the level gauge 9. As the produced fluid is carried in... The gas in the downcomer 3 flows upward along with the purified shale oil and enters the gas phase space through the riser 8. The produced water separated by the electric field flows to the lower part of the vertical oil, gas and water treatment container 1. The flow rate of the produced water outlet 18 is controlled by the electric regulating valve 13 of the produced water outlet, which is interlocked by the interface instrument 10. An air vent 20 is set at the top of the vertical oil, gas and water treatment container 1. When the operating pressure of the vertical oil, gas and water treatment container 1 exceeds the pressure, the container safety valve 15 opens and the pressure inside the vertical oil, gas and water treatment container 1 is released through the air vent 20 pipeline. A drain outlet 21 is set at the bottom of the vertical oil, gas and water treatment container 1 for periodic drainage or drainage when the unit is shut down or under maintenance.

[0016] Working principle: After the shale oil produced fluid enters the vertical oil, gas and water treatment container 1 through the inlet 16, the produced fluid enters the container 1 from the side wall, forming a vortex. Through the principle of gravity settling and according to Stokes' law, gas-liquid separation is achieved. The produced fluid inlet pipe 22 is connected to the inner wall of the container and is equipped with an anti-impact plate 23, which protects the inner wall of the container and ensures the service life of the container. The first separated gas phase passes through the wire mesh demister 2 to capture small droplets in the gas phase. The associated gas outlet electric regulating valve 14 on the associated gas outlet 19 pipeline is adjusted by the remote pressure gauge 11 in the interlock chamber to control the opening degree of the associated gas outlet electric regulating valve 14 and control the associated gas outlet gas volume.

[0017] The separated liquid falls onto the upper funnel-shaped baffle, forming a certain liquid layer height. The upper baffle is designed to be inclined at a certain angle towards the downcomer 3, preventing the formation of a dead zone in the liquid phase when the liquid phase flows into the downcomer 3 by gravity. Because the upper liquid has higher potential energy, it flows downwards into the distribution pipe 4, which opens obliquely downwards. After uniform distribution, the oil-water mixed produced fluid flows upwards in the opposite direction using the principle of gravity, entering the electric field channel 5. For shale oil produced fluid, the flow velocity in the electric field channel 5 needs to be greater than 0.0015 m / s. The width of the electric field channel 5 is preferably 0.2 m to 0.4 m. A non-uniform cylindrical strong electric field is formed between the cylindrical electrode 6 and the tubular electrode plate 7. The outer diameter of the cylindrical electrode 6 is not less than 0.02 m, and the gap ratio between the cylindrical electrode 6 and the tubular electrode plate 7 does not exceed 95%. The electric field strength between the cylindrical electrode 6 and the tubular electrode 7 is related to the dielectric constants of the materials and the emulsion, as well as the distance between them and the cylindrical electrode 6. The specific formulas are as follows: Where Eo is the electric field strength and U is the power supply voltage. The relative permittivity of the emulsion is... Let t be the relative permittivity of the cylindrical electrode material, t be the thickness of the cylindrical electrode material, r1 be the outer diameter of the cylindrical electrode 6, r be the radius of the emulsion location, and a be the channel spacing. As shown in the formula, the electric field in the electric field channel 5 has a ring-shaped gradient distribution. Under the same voltage, the closer the emulsion is to the cylindrical electrode 6, the greater the electric field strength. Simultaneously, to ensure the gap ratio between the cylindrical electrode 6 and the tubular electrode plate 7, the distance between them is significantly reduced compared to the conventional horizontal or vertical electrode spacing. Under the same voltage conditions, this ensures a greater electric field strength can be generated in the electric field channel 5, which helps accelerate the demulsification of the shale oil produced fluid, causing water droplets to quickly coalesce. Utilizing the principle of gravity, the purified shale oil flows upward out of the electric field, while the produced water flows downward out of the electric field, achieving efficient dehydration and oil-water separation.

[0018] As the purified shale oil rises, some associated gas will overflow and pass through the gas riser pipe 8 of the upper baffle into the gas phase space of the vertical oil, gas and water treatment container 1. The gas riser pipe 8 is cylindrical and is at least 100mm higher than the liquid level of the upper baffle to prevent the liquid on the upper baffle from entering the electric field flow channel 5 through the gas riser pipe 8. At the same time, a brim-type liquid baffle is installed at the top of the gas riser pipe 8 to prevent the liquid from falling into the gas riser pipe 8.

[0019] The purified shale oil exiting the electric field is interlocked with the level gauge 9 via the purified shale oil outlet electric regulating valve 12 on the purified shale oil outlet pipeline 17, which adjusts the opening of the purified shale oil outlet electric regulating valve 12 to control the purified shale oil outlet flow rate; the produced water is interlocked with the interface instrument 10 via the produced water outlet electric regulating valve 13 on the produced water outlet pipeline 18, and the opening of the produced water outlet electric regulating valve 13 is adjusted according to the height of the interface instrument 10.

[0020] When the vertical oil, gas and water treatment container 1 is operating under overpressure, the container safety valve 15 opens to release pressure. When the vertical oil, gas and water treatment container 1 is scheduled for periodic drainage, maintenance, or shutdown, drainage is carried out through the drainage outlet 21.

[0021] This invention utilizes a non-uniform cylindrical strong electric field to dehydrate crude oil, achieving the requirements of miniaturization, short process, and skid-mounted design for shale oil produced fluid treatment devices. A single skid enables oil-gas-water separation and provides efficient and stable dehydration treatment for shale oil with small droplet size, high emulsification degree, and high dehydration difficulty.

[0022] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and application concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vertical integrated oil, gas and water treatment device for shale oil well sites, comprising a vertical oil, gas and water treatment container (1), wherein a shale oil produced fluid inlet (16) is provided on one side of the upper end of the vertical oil, gas and water treatment container (1), the shale oil produced fluid inlet (16) is connected to the gas phase space inside the vertical oil, gas and water treatment container (1) through a produced fluid inlet pipe (22), the produced fluid inlet pipe (22) penetrates the side wall of the vertical oil, gas and water treatment container (1), and an anti-impact plate (23) is provided on the inner side of the container wall where the produced fluid inlet pipe (22) is connected; a purified shale oil outlet (17) is provided on the other side of the upper end of the vertical oil, gas and water treatment container (1); an air vent outlet (20) and an associated gas outlet (19) are provided at the top of the vertical oil, gas and water treatment container (1), and a liquid discharge outlet (21) and a produced water outlet (18) are provided at the bottom; characterized in that: The vertical oil, gas and water treatment container (1) is equipped with a baffle. The shale oil produced fluid inlet (16) is located at the upper end of the baffle, and the purified shale oil outlet (17) is located at the lower end of the baffle. A gas riser (8) is provided on the top surface of the baffle, and a wire mesh demister (2) is provided above the gas riser (8). A downcomer (3) is connected to the bottom center of the baffle, and a liquid distribution pipe (4) is connected to the bottom of the downcomer (3). A cylindrical electrode (6) and a tubular electrode plate (7) are provided between the baffle and the liquid distribution pipe (4). The cylindrical electrode (6) is fixedly installed inside the tubular electrode plate (7), and an electric field channel (5) is provided between the cylindrical electrode (6) and the tubular electrode plate (7).

2. The vertical integrated oil, gas and water treatment device for shale oil well sites as described in claim 1, characterized in that: The vertical oil, gas and water treatment container (1) is equipped with a level gauge (9), an interface meter (10) and a remote pressure gauge (11); the purified shale oil outlet (17) is provided with a purified shale oil outlet electric regulating valve (12), which is interlocked with the level gauge (9); the produced water outlet (18) is provided with a produced water outlet electric regulating valve (13), which is interlocked with the interface meter (10); the associated gas outlet (19) is provided with an associated gas outlet electric regulating valve (14), which is interlocked with the remote pressure gauge (11).

3. The vertical integrated oil, gas and water treatment device for shale oil well sites as described in claim 1, characterized in that: A container safety valve (15) is installed on the pipeline of the vent outlet (20).

4. The vertical integrated oil, gas and water treatment device for shale oil well sites as described in claim 1, characterized in that: The top of the riser pipe (8) is equipped with a brim-type liquid baffle.

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