Waterfall curtain type wall cleaning feeding device and spraying coverage rate calculation method

Abstract

A waterfall curtain type wall cleaning feeding device is characterized in that a spraying system, a stirring system and a metering control system are arranged in a tank body, the spraying system is arranged at the top end in the tank body, the spraying system sprays the interior of the tank body through a plurality of spraying heads which are annularly and uniformly arranged, and the spraying system and the stirring system are in circuit connection with the metering control system. The discharging system has the beneficial effects that the problems of fisheyes, caking and the like caused by insufficient dissolution of materials due to the fact that chemicals are attached to the wall surface of the inner wall of a tank in a discharging system for profile control and flooding of an offshore oilfield at present are solved. According to the device, a plurality of spray headers are annularly and uniformly arranged at the top end in the dissolving tank body, and a solvent is sprayed through water nozzles of the spray headers to wash an agent attached to the tank wall, so that a waterfall curtain type wall cleaning effect is achieved, and the problem that solid powder adheres to the wall and is agglomerated is solved. The invention further provides a method for calculating the spraying coverage rate of the feeding device, and discloses the optimal water nozzle number, the optimal water nozzle structure, the optimal spraying angle, the optimal displacement and the optimal arrangement mode of the water nozzles of the spraying head, so that the spraying coverage rate is maximized.

Description

Technical Field

[0001] The invention relates to the technical field of solid powder dissolution, and more particularly to a waterfall-curtain type wall cleaning feeding device and a method for calculating a spray coverage rate. Background Art

[0002] At present, profile control and displacement control have become important means of stabilizing oil and controlling water at sea, and have played an important role in the management of high-water-content oil fields. With the development of profile control and displacement control technology, it is necessary to develop modular ground injection equipment that meets the production needs of oil fields and is suitable for profile control and displacement control operations, with strong compatibility, so as to provide new technical solutions and support guarantees for the large-scale promotion and application of offshore oilfield three-recovery technology and stabilizing oil and controlling water technology.

[0003] At present, offshore oilfield profile control and flooding mainly adopt multiple sets of deep profile control technologies such as gel, weak gel, colloidal dispersion gel and flexible particles. The supporting injection process mainly adopts fixed, skid-mounted and online injection equipment. Among them, the dissolution and dispersion of solid powders such as flexible particles are mainly carried out in circular dissolution tanks. Due to the small particle size of the powder, it is easy to fly in the dissolution tank during the feeding process, and the agent particles themselves are easy to adhere to water. Therefore, the feeding system has problems such as the agent adhering to the inner wall of the tank, insufficient dissolution, fish eyes, and agglomerations, resulting in insufficient dissolution and uneven dispersion of the solid agent. At the same time, fish eyes and agglomerations are easy to block the pipeline, resulting in unqualified liquid preparation. Summary of the invention

[0004] The invention overcomes the deficiencies in the prior art and provides a waterfall curtain type wall cleaning feeding device and a method for calculating the spray coverage rate.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] A waterfall-type wall cleaning feeding device comprises: a spraying system, a stirring system and a metering control system are arranged inside a tank body, the spraying system is arranged at the top of the tank body, the spraying system sprays the inside of the tank body through a plurality of spray heads evenly arranged in a ring, and the spraying system and the stirring system are connected with the metering control system circuit.

[0007] A tank roof is arranged on the top of the tank body, and an upper manhole, a manhole sight glass, a respirator and a feed port are arranged on the tank roof.

[0008] The spray system includes a liquid supply pipeline, a spray port, a spray pipe and a spray head. The spray pipe is arranged on the top of the tank. The spray pipe is connected to the liquid supply pipeline through the spray port. The spray heads are equidistantly arranged on the spray pipe. The spray medium is transported to the spray pipe through the liquid supply pipeline via the spray port and sprayed out through the spray head.

[0009] The liquid supply pipeline is a two-way parallel structure.

[0010] There are 12 sprinkler heads, and the included angle between the sprinkler heads and the inner wall of the tank is 45°.

[0011] The stirring system includes a motor, a reducer, a stirring shaft stabilizing seat, a stirring shaft and a stirring frame. The motor and the reducer are arranged in coordination, the reducer is arranged on the top of the tank, the stirring shaft stabilizing seat is arranged on the bottom of the tank, the two ends of the stirring shaft are respectively connected with the motor and the stirring shaft stabilizing seat, and the stirring frame is arranged on the stirring shaft.

[0012] The tank body is a cylindrical structure, the tank bottom is a conical structure, the tank bottom is provided with supporting legs and a discharge port, and the discharge port is connected to the inner side of the tank body.

[0013] The sprinkler head adopts a water nozzle.

[0014] The metering control system includes a PLC control system, a pressure sensing liquid level gauge, a pressure gauge and a flow meter. The PLC control system is connected with the pressure sensing liquid level gauge, the pressure gauge and the flow meter. The pressure sensing liquid level gauge is arranged on the tank body, and the pressure gauge and the flow meter are connected with the spraying system.

[0015] A method for calculating the spray coverage rate of a waterfall curtain type wall cleaning feeding device includes the following specific calculation formula:

[0016] Coverage (S) = lateral coverage (S 横 )*Vertical coverage (S 纵 )

[0017] Horizontal coverage (S 横 )=arcsin(L / 2 / R 罐 ) / N / 180

[0018] Vertical coverage (S 纵 )=h / H

[0019] Where S is the coverage rate; S 横 is the lateral coverage; S 纵 is the vertical coverage rate; h is the distance from the spray test point to the bottom; L is the straight-line distance between the two ends of the spray point; H is the height of the agent coverage; R 罐 is the inner diameter of the dissolving tank; N is the number of sprinkler heads.

[0020] The beneficial effects of the present invention are:

[0021] This solution aims to solve the problem that the reagents in the current feed system for offshore oilfield profile control and flooding are attached to the inner wall of the tank, which causes insufficient dissolution of the material, resulting in fish eyes, agglomeration and other problems. This device arranges multiple spray heads evenly in a ring at the top of the dissolving tank body, and sprays solvent through the spray head nozzles to flush the attached reagents on the tank wall, achieving a waterfall-style wall cleaning effect and preventing the problem of solid powder sticking to the wall and agglomerating.

[0022] Furthermore, this solution also provides a method for calculating the spray coverage rate of the feeding device, and discloses the optimal number of nozzles, nozzle structure, spray angle, discharge volume and arrangement of the sprinkler nozzles to maximize the spray coverage rate and achieve a better waterfall-style wall cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram showing the structure of the device;

[0024] Figure 2 It is a schematic diagram of the expansion of the tank;

[0025] Figure 3 It is a schematic diagram of the structure of the sprinkler nozzle;

[0026] In the figure: 1. Discharge port; 2. Tank body; 3. Tank top; 4. Upper manhole; 5. Manhole sight glass; 6. Reducer; 7. Motor; 8. Respirator; 9. Feed port; 10. Spray port; 11. Spray pipe; 12. Spray head; 13. Stirring shaft; 14. Stirring frame; 15. Tank bottom; 16. Stirring shaft stabilizing seat; 17. Support leg; 18. Pressure sensing liquid level gauge; 19. Spray head coverage area; 20. Agent coverage area. DETAILED DESCRIPTION

[0027] Example

[0028] A waterfall-type wall cleaning feeding device comprises: a spraying system, a stirring system and a metering control system are arranged inside a tank body 2, the spraying system is arranged at the top of the tank body 2, the spraying system sprays the inside of the tank body 2 through a plurality of spray heads evenly arranged in a ring, and the spraying system and the stirring system are connected to the metering control system circuit.

[0029] A tank top 3 is provided on the top of the tank body 2, and an upper manhole 4, a manhole sight glass 5, a respirator 8 and a feed port 9 are provided on the tank top 3.

[0030] The spray system includes a spray port 10, a liquid supply pipeline, a spray pipe 11 and a spray head 12. The spray port 10 is arranged on the tank top 3, the spray port 10 is connected to the liquid supply pipeline, the spray port 10 is connected to the spray pipe 11, and the spray head 12 is equidistantly arranged on the spray pipe 11.

[0031] The spray system includes a liquid supply pipeline, a spray port 10, a spray pipe 11 and a spray head 12. The spray pipe 11 is arranged on the tank top 3. The spray pipe 11 is connected to the liquid supply pipeline through the spray port 10. The spray head 12 is equidistantly arranged on the spray pipe 11. The spray medium is transported to the spray pipe 11 through the liquid supply pipeline via the spray port 10 and is sprayed out through the spray head 12.

[0032] The liquid supply pipeline is a two-way parallel structure.

[0033] The number of the spray heads 12 is 12, and the angle between the spray heads 12 and the inner wall of the tank body 2 is 45°.

[0034] The stirring system includes a motor 7, a reducer 6, a stirring shaft stabilizing seat 16, a stirring shaft 13 and a stirring frame 14. The motor 7 is arranged in conjunction with the reducer 6, the reducer 6 is arranged on the tank top 3, the stirring shaft stabilizing seat 16 is arranged on the tank bottom 15, the two ends of the stirring shaft 13 are respectively connected to the motor 7 and the stirring shaft stabilizing seat 16, and the stirring frame 14 is arranged on the stirring shaft 13.

[0035] The tank body 2 is a cylindrical structure, and the tank bottom 15 is a conical structure. The tank bottom 15 is provided with legs 17 and a discharge port 1 , and the discharge port 1 is communicated with the inner side of the tank body 2 .

[0036] The shower head 12 is a water nozzle.

[0037] The metering control system includes a PLC control system, a pressure sensing liquid level gauge 18, a pressure gauge and a flow meter. The PLC control system is connected with the pressure sensing liquid level gauge 18, the pressure gauge and the flow meter. The pressure sensing liquid level gauge 18 is arranged on the tank body 2, and the pressure gauge and the flow meter are connected with the spray system.

[0038] like Figure 1 and Figure 3 As shown, the working principle of the device is as follows: the device feeds materials into the tank body 2 through the feed port 9 for mixing. The spray medium is delivered from the liquid supply pipeline through the spray port 10 arranged on the tank top 3 to the spray pipe 11, and is sprayed out by the spray head 12 to perform a spraying operation, thereby achieving a wall cleaning effect and preventing solid powder from sticking to the wall and agglomerating. The spray system, the stirring system, and the inlet valve, the outlet valve and other devices arranged on the tank body 2 are all controlled by the metering control system.

[0039] Preferably, the liquid supply pipeline adopts a two-way parallel structure so that any one of the sprinkler heads 12 in the pipeline will not cause water volume attenuation due to insufficient pressure.

[0040] Further, the working steps of this device are as follows:

[0041] Check the display status of each display instrument of the spray system, and observe the liquid level in tank 2; test the status of the liquid inlet valve, liquid outlet valve, stirring system, and spray system through the power distribution cabinet; after the preparation work is completed, open the solenoid valve of the liquid inlet tank through the power distribution cabinet, start the spray system to add water, and add water to a total water volume of 40cm; start adding solid powder, and start the stirring system at the same time, stirring while adding powder. After the powder is added, stop when the liquid level reaches 1.2 meters, and stir thoroughly to meet the liquid distribution requirements.

[0042] The sprinkler system determines the best sprinkler layout, direction and discharge volume by testing the relationship between the waterfall curtain ring sprinkler layout, sprinkler direction, discharge volume and wall coverage to achieve the best effect under the conditions. The specific optimization examples are as follows.

[0043] like Figure 2 As shown in the figure, the spray head coverage area 19 is the spray coverage area of ​​a single spray head 12, its height is h, that is, the distance from the spray test landing point to the bottom, and its width is L, that is, the straight-line distance between the two ends of the spray landing point. The height of the reagent coverage area 20 is H, that is, the reagent coverage height.

[0044] A method for calculating the spray coverage rate of a waterfall curtain type wall cleaning feeding device includes the following specific calculation formula:

[0045] Coverage (S) = lateral coverage (S 横 )*Vertical coverage (S 纵 )

[0046] Horizontal coverage (S 横 )=arcsin(L / 2 / R 罐 ) / N / 180

[0047] Vertical coverage (S 纵 )=h / H

[0048] Where S is the coverage rate; S 横 is the lateral coverage; S 纵 is the vertical coverage rate; h is the distance from the spray test point to the bottom; L is the straight-line distance between the two ends of the spray point; H is the height of the agent coverage; R 罐 is the inner diameter of the dissolving tank; N is the number of sprinkler heads.

[0049] In this embodiment, the coverage is tested using two examples.

[0050] Coverage test example 1:

[0051] In the following examples, the shower head 12 is described as a water nozzle.

[0052] A waterfall-type wall cleaning feeding device was used, with 6 water nozzles installed and the spraying capacity set to 60L / min. The angles of the water nozzles were adjusted to 10°, 20°, 30°, 40°, 50°, and 60° respectively to conduct tests on the spraying direction and coverage effect of the water nozzles. The test results are shown in Table 1.

[0053] The test steps are as follows:

[0054] ① Prepare waste liquid storage tanks, test tanks and other equipment, test the status of the liquid inlet valve, liquid outlet valve, mixing system and spray system through the power distribution cabinet, and check that the test water source is clean and pollution-free;

[0055] ② Adjust the number of water nozzles in the spray system to 6, set the spray volume to 60L / min, and check the display status of each display instrument and camera;

[0056] ③After adjusting the water nozzle by 10°, open the solenoid valve of the liquid inlet tank through the power distribution cabinet, start the spray system to add water, and start the stirring system at the same time. After the water spray is stable and the wall water flow coverage is stable, record the wall coverage effect when the water nozzle is 10°. Each test time is required to be more than 10 minutes;

[0057] ④Stop spraying, open the drain port, release the water in the tank, clean the inner wall, and conduct the next test after the inner wall is dry and no water remains;

[0058] ⑤Repeat steps ③④, and record the different spraying directions and coverage effects of the water nozzle when the water nozzle is 20°, 30°, 40°, 50°, and 60° respectively.

[0059] Coverage test example 2:

[0060] The waterfall-type wall cleaning feeding device was used to test the relationship between the density, structure, displacement and wall coverage of the water nozzles. The waterfall-type wall cleaning device was installed with linear water nozzles, and the wall effect was monitored with 3, 6, 9, and 12 water nozzles per circle and a displacement of 30, 60, 80, and 100L / min respectively.

[0061] The test steps are as follows:

[0062] ① Prepare waste liquid storage tanks, test tanks and other equipment, test the status of the liquid inlet valve, liquid outlet valve, mixing system and spray system through the power distribution cabinet, and check that the test water source is clean and pollution-free;

[0063] ② Install linear water nozzles, and adjust the direction of the water nozzles according to the test results of the "Sprinkler Head Direction Coverage Relationship Test", that is, the coverage test example 1. Adjust the number of water nozzles installed in the sprinkler system to 3, and set the spraying volume to 30L / min. Check the display status of each display instrument and camera;

[0064] ③Open the solenoid valve of the liquid inlet tank through the power distribution cabinet, start the spray system to add water, and start the stirring system at the same time. After the water spray is stable and the wall water flow coverage is stable, record the wall coverage effect of 3 water nozzles when the spray discharge is 30L / min (each test time is required to be more than 10 minutes);

[0065] ④Stop spraying, open the drain port, release the water in the tank, clean the inner wall, and conduct the next test after the inner wall is dry and no water remains;

[0066] ⑤ Repeat steps ②③④ to test the wall coverage effect when there are 6, 9, and 12 water nozzles and the displacement is 60, 80, and 100 L / min respectively. The test results are shown in Table 2.

[0067] Comparative test example 1

[0068] Under the same water nozzle (6 water nozzles) conditions, different water nozzle vertical angles (10° to 45°), as the test angle increases, the distance between the landing point and the tank bottom increases, the longitudinal coverage rate increases, but the spacing between the spray landing points decreases, resulting in the lateral coverage rate being effective. The comprehensive coverage rate (total coverage rate) is optimal at 45°.

[0069]

[0070] Comparative test example 2

[0071] The test results show that the 12 linear water nozzles with a flow rate of 60, 80, and 100 L / min cover the tank wall well, with a coverage rate of more than 90%.

[0072]

[0073]

[0074] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A waterfall curtain type wall cleaning feeding device, characterized in that: include: A spraying system, a stirring system and a metering control system are provided inside the tank body. The spraying system is arranged at the top of the tank body. The spraying system sprays the inside of the tank body through multiple spray heads evenly arranged in a ring. The spraying system and the stirring system are connected to the metering control system circuit.

2. A waterfall-type wall cleaning feeding device according to claim 1, characterized in that: include: A tank top is arranged on the top of the tank body, and an upper manhole, a manhole sight glass, a respirator and a feed port are arranged on the tank top.

3. The waterfall-type wall cleaning feeding device according to claim 2 is characterized in that: The spray system includes a liquid supply pipeline, a spray port, a spray pipe and a spray head. The spray pipe is arranged on the top of the tank. The spray pipe is connected to the liquid supply pipeline through the spray port. The spray heads are equidistantly arranged on the spray pipe. The spray medium is transported to the spray pipe through the liquid supply pipeline via the spray port and sprayed out through the spray head.

4. The waterfall-type wall cleaning feeding device according to claim 3 is characterized in that: The liquid supply pipeline is a two-way parallel structure.

5. The waterfall-type wall cleaning feeding device according to claim 3 is characterized in that: The number of the spray heads is 12, and the angle between the spray heads and the inner wall of the tank body is 45°.

6. The waterfall-type wall cleaning feeding device according to claim 2 is characterized in that: The stirring system includes a motor, a reducer, a stirring shaft stabilizing seat, a stirring shaft and a stirring frame. The motor and the reducer are arranged in cooperation with each other. The reducer is arranged on the top of the tank. The stirring shaft stabilizing seat is arranged on the bottom of the tank. Both ends of the stirring shaft are respectively connected with the motor and the stirring shaft stabilizing seat. The stirring frame is arranged on the stirring shaft.

7. The waterfall-type wall cleaning feeding device according to claim 1 is characterized in that: The tank body is a cylindrical structure, the tank bottom is a conical structure, the tank bottom is provided with legs and a discharge port, and the discharge port is communicated with the inner side of the tank body.

8. The waterfall-type wall cleaning feeding device according to claim 1, characterized in that: The spray head adopts a water nozzle.

9. The waterfall-type wall cleaning feeding device according to claim 1, characterized in that: The metering control system includes a PLC control system, a pressure sensing liquid level gauge, a pressure gauge and a flow meter. The PLC control system is connected with the pressure sensing liquid level gauge, the pressure gauge and the flow meter. The pressure sensing liquid level gauge is arranged on the tank body. The pressure gauge and the flow meter are connected with the spray system.

10. A method for calculating the spray coverage rate of a waterfall-type wall cleaning feeding device, characterized in that: The specific calculation formula is as follows: Coverage (S) = lateral coverage (S 横 )*Vertical coverage (S 纵 ) Horizontal coverage (S 横 )=arcsin(L / 2 / R 罐 ) / N / 180 Vertical coverage (S 纵 )=h / H Where S is the coverage rate; S 横 is the lateral coverage; S 纵 is the vertical coverage rate; h is the distance from the spray test point to the bottom; L is the straight-line distance between the two ends of the spray point; H is the height of the agent coverage; R 罐 is the inner diameter of the dissolving tank; N is the number of sprinkler heads.

Images