Online cleaning device for air floatation tank of dehydration system

Abstract

The utility model discloses an on-line cleaning device for an air floatation tank of a dehydration system, which comprises a flushing rod, a rotary spray head, a sealing cylinder and a pressure relief cylinder, the sealing cylinder is hermetically connected with an isolation ball valve at the top end of the air floatation tank through the pressure relief cylinder, and one end of the flushing rod is provided with the rotary spray head. The end, provided with the rotary spray head, of the flushing rod sequentially penetrates through the sealing cylinder, the pressure relief cylinder and the isolation ball valve and then enters an inner cavity of the air floatation tank, and the rotary spray head can move up and down along with the flushing rod. The online cleaning device can be used for conveniently and quickly cleaning the inner cavity and the guide plate of the air floatation tank online, has the characteristics of convenience and quickness in cleaning and good effect, successfully solves the problems that the air floatation tank can be cleaned offline, is difficult to disassemble and assemble, consumes long time and is high in cost, reduces the workload, improves the working efficiency and ensures the production safety of an oil field.

Description

Technical Field

[0001] The utility model relates to cleaning equipment for an offshore oil and gas field dehydration system, in particular to an online cleaning device for an air flotation tank in an offshore oil and gas field dehydration system. Background Art

[0002] The air flotation tank 4 (such as Figure 1 The flotation tank 4 is used to remove floating oil from production wastewater. The principle is to inject gas to form bubbles, float suspended substances such as oil in the water to the surface, and then collect them. However, due to the influence of factors such as the production and liquid increase of the upstream platform in the offshore oil and gas field dehydration system, the reverse drainage of drilling and repairing, and the poor separation and treatment effect, after the dehydration system has been running for a period of time, the oil sludge in the production wastewater will accumulate on the guide plate 3 between the inner cavity 1 and the outer cavity 2 at the top of the flotation tank 4, causing the guide plate 3 to be partially blocked, and a large amount of liquid It is carried to the closed discharge tank, causing the liquid level in the closed discharge tank to rise, resulting in the risk of production having to be shut down or risking fire rain, and the frequent blockage of the guide plate 3 will also seriously affect the flotation treatment capacity and efficiency. The production water discharge into the sea does not meet the standards, which has a great impact on the stable production of the oil field and the increase in production and liquid. During the top-down flow of the production wastewater in the flotation tank 4, the upper chamber in the inner cavity 1 and the outer cavity 2 is full, and the lower chamber is not full. The process parameters show problems such as liquid level drop, operating pressure increase, and treatment volume decrease. In order to clean and dredge the inner cavity 2 and the guide plate 3 of the flotation tank 4, it is usually necessary to open the 20-inch inlet hole on the side of the flotation tank 4 to clean the lower part of the guide plate 4 after the dehydration system is shut down, and the upper part of the guide plate 4 with more oil sludge needs to remove the pressure gauge on the top of the flotation tank, and the personnel must stand at the height of the operating table to clean it, but can only be flushed and cleaned through the 4-inch flange hole of the pressure gauge removal port. This cleaning method is time-consuming and laborious. The cleaning of the upper part of the guide plate 3 with more oil sludge is also not effective due to limited operating space. From the description, it can be seen that the frequent blockage of the guide plate 3 between the inner cavity 1 and the outer cavity 2 of the flotation tank 4 will seriously affect the safe production of the oil field, reduce production efficiency and increase cost. Utility Model Content

[0003] The purpose of the utility model is to propose an online cleaning device for a flotation tank of a dehydration system, which can conveniently and quickly clean the inner cavity and guide plate of the flotation tank online, has the characteristics of convenient and fast cleaning and good effect, successfully solves the problem that the flotation tank needs to be cleaned offline, is difficult to disassemble and assemble, is time-consuming and expensive, reduces the workload, improves work efficiency, and ensures the production safety of the oil field.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An online cleaning device for a flotation tank of a dehydration system comprises a flushing rod, a rotating nozzle, a sealing cylinder and a pressure relief cylinder. The sealing cylinder is sealed with an isolation ball valve at the top of the flotation tank via the pressure relief cylinder. A rotating nozzle is provided at one end of the flushing rod. The end of the flushing rod with the rotating nozzle sequentially passes through the sealing cylinder, the pressure relief cylinder and the isolation ball valve and then enters the inner cavity of the flotation tank. The rotating nozzle can move up and down with the flushing rod.

[0006] Furthermore, the length of the flushing rod is greater than or equal to the sum of the lengths of the sealing tube and the pressure relief tube, the isolation ball valve and the flotation tank 4, and the flushing rod is provided with a distance scale.

[0007] Furthermore, the end of the flushing rod away from the rotating nozzle is connected to a connecting rod, and a needle valve and a check valve are sequentially arranged on the connecting rod from the quick connector end to the connecting end with the flushing rod. The connecting end of the flushing rod and the connecting rod is provided with a first pressure gauge and a safety baffle.

[0008] Furthermore, the sealing cylinder, the pressure relief cylinder and the isolation ball valve are detachably connected via flanges and sealing gaskets.

[0009] Furthermore, the pressure relief cylinder is connected to a pressure relief port gauge valve, and the pressure relief port gauge valve is connected to a second pressure gauge.

[0010] Furthermore, a sealing gland and a sealing packing are provided at the end of the sealing cylinder away from the flange, and the flushing rod can pass through the sealing gland and the sealing packing in the sealing gland.

[0011] Furthermore, the rotating nozzle includes a rotating sphere, a nozzle and a sealed rotating bearing. The rotating sphere is connected to a connecting piece through a sealed rotating bearing, and the connecting piece is connected to a flushing rod through a threaded joint. A high-temperature and high-pressure flushing water pipe is also provided in the rotating sphere, and a plurality of nozzles are evenly distributed or staggered on the outer wall of the rotating sphere.

[0012] Furthermore, one end of the high-temperature and high-pressure flushing water pipe is connected to the flushing rod, and the other end passes through the connecting piece and the sealed rotating bearing in sequence and enters into the rotating sphere. The rotating sphere is a hollow structure, and the nozzle is connected to the hollow rotating sphere.

[0013] Furthermore, there are three nozzles, which are arranged on the outer wall of the rotating sphere at an angle of 120°.

[0014] Furthermore, a soft whip is installed on the rotating sphere, so that the inner cavity wall of the flotation tank can be beaten and vibrated for cleaning during flushing.

[0015] The advantages of the utility model are:

[0016] The utility model sets the length of the flushing rod to be greater than or equal to the sum of the lengths of the sealing tube and the pressure relief tube, the isolation ball valve and the air flotation tank, and sets a distance scale on the flushing rod. The length of the flushing rod and the distance scale are matched to facilitate the adjustment of the depth and distance of the inner cavity of the air flotation tank and the guide plate therein when flushing, thereby improving the cleaning efficiency and saving time.

[0017] The utility model can detachably connect the sealing cylinder, the pressure relief cylinder and the isolation ball valve through flanges and sealing pads, so that they can be quickly and conveniently disassembled and assembled, thereby improving work efficiency.

[0018] The utility model arranges the nozzles at an angle of 120 degrees on the outer wall of the rotating sphere, the nozzles are eccentrically arranged relative to the center line of the sealed rotating bearing, and the angles of water spraying are directed to the same side. The reaction force of the water sprayed by the nozzles can be used to promote the automatic rotation of the rotating sphere to clean different height positions of the inner cavity of the flotation tank, thereby improving work efficiency and reducing workload.

[0019] The utility model can judge the position according to the distance scale on the flushing rod, pull the flushing rod upward to the position until the rotating nozzle is completely retracted into the pressure relief cylinder, and then close the isolation ball valve to prevent the oil and gas in the flotation tank from leaking out, and relieve the pressure of the pressure relief cylinder through the pressure relief port gauge valve. After the pressure relief is completed, the connecting flange between the pressure relief cylinder and the isolation ball valve is disassembled, and the rotating nozzle can be replaced online, thereby saving time, improving work efficiency, and ensuring the production safety of the oil field.

[0020] The utility model can conveniently and quickly carry out online cleaning of the inner cavity and the guide plate of the flotation tank, has the characteristics of convenient and fast cleaning and good effect, successfully solves the problem that the flotation tank needs to be cleaned offline, is difficult to disassemble and assemble, is time-consuming and expensive, reduces the workload, improves the work efficiency, and ensures the production safety of the oil field. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an air flotation tank in the background technology;

[0022] Figure 2 It is a side view schematic diagram of the structure of the utility model;

[0023] Figure 3 It is a side view structural schematic diagram of the nozzle of the utility model;

[0024] Figure 4 It is a schematic diagram of the eccentric orientation of the nozzle of the utility model relative to the sealed rotary bearing.

[0025] In the figure: 1 inner cavity, 2 outer cavity, 3 guide plate, 4 flotation tank, 5 quick connector, 6 needle valve, 7 check valve, 8 first pressure gauge, 9 safety baffle, 10 flushing rod, 11 distance scale, 12 sealing gland, 13 sealing packing, 14 sealing cylinder, 15 pressure relief cylinder, 16 pressure relief port valve, 17 second pressure gauge, 18 isolation ball valve, 19 rotating nozzle, 20 threaded joint, 21 connecting piece, 22 sealed rotating bearing, 23 rotating sphere, 24 nozzle, 25 high temperature and high pressure flushing water pipe. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] like Figure 2 , Figure 3 and Figure 4 As shown, an online cleaning device for a flotation tank of a dehydration system includes a flushing rod 10, a rotating nozzle 19, a sealing cylinder 14 and a pressure relief cylinder 15. The sealing cylinder 14 is sealedly connected to the pressure relief cylinder 15, the isolation ball valve 18 and the flotation tank 4 in sequence. A rotating nozzle 19 is provided at one end of the flushing rod 10. After the flushing rod 10 passes through the sealing cylinder 14, the pressure relief cylinder 15 and the isolation ball valve 18 in sequence through the rotating nozzle 19 end, the rotating nozzle 19 can be inserted into the inner cavity of the flotation tank 4 by moving up and down with the flushing rod 10.

[0029] The length of the flushing rod 10 is greater than or equal to the sum of the lengths of the sealing tube 14, the pressure relief tube 15, the isolation ball valve 18 and the flotation tank 4, and the flushing rod 10 is provided with a distance scale 11. The length of the flushing rod 10 and the distance scale 11 are arranged in coordination to facilitate the adjustment of the depth of the inner cavity of the flotation tank 4 and the guide plate therein when flushing.

[0030] The end of the flushing rod 10 away from the rotating nozzle 19 is connected to a connecting rod, which can be conveniently and quickly connected to a hose that transports high-temperature and high-pressure water or cleaning agent through a quick connector 5. The quick connector can facilitate the dynamic adjustment of the flushing rod 10 relative to the inner cavity of the flotation tank 4 and the guide plate by connecting the hose.

[0031] The connecting rod is provided with a needle valve 6 and a check valve 7 in sequence from the quick connector 5 end to the connection end with the flushing rod 10. The needle valve 6 and the check valve 7 are provided for the flow direction, flow rate and switch adjustment of high-temperature water. The connection end between the flushing rod 10 and the connecting rod is provided with a first pressure gauge 8 and a safety baffle 9. The first pressure gauge 8 is used to detect the pressure in the flushing rod 10. The safety baffle 9 is used to prevent the flushing rod 10 from colliding with the sealing cylinder 14 when it penetrates into the bottom of the inner cavity of the flotation tank 4 to avoid damage.

[0032] The sealing cylinder 14, the pressure relief cylinder 15 and the isolation ball valve 18 are detachably connected via flanges and sealing gaskets. The isolation valve 18 is a switch ball valve provided at the top of the flotation tank 4 and capable of opening and closing the internal air pressure of the flotation tank 4. When the isolation ball valve 18 is opened, the flushing rod 10 with the rotating nozzle 19 can be inserted into the flotation tank 4 to clean the inner cavity and the guide plate of the flotation tank 4.

[0033] The pressure relief cylinder 15 is connected to a pressure relief port gauge valve 16 , which is connected to a second pressure gauge 17 . The second pressure gauge 17 is used to monitor the pressure in the pressure relief cylinder 15 . The pressure relief port gauge valve 16 can be used to isolate the pressure gauge or release the pressure in the pressure relief cylinder 15 .

[0034] The sealing cylinder 14 is provided with a sealing cover 12 and a sealing packing 13 at the end away from the flange. The sealing cover 12 and the sealing packing 13 can seal the oil and gas in the sealing cylinder 14. When the flushing rod 10 passes through the sealing cover 12 and the sealing packing 13 in the sealing cover 12, it can move up and down relative to the sealing cylinder 14, which can play a better sealing role.

[0035] The rotating nozzle 19 includes a rotating sphere 23, a nozzle 24 and a sealed rotating bearing 22. The rotating sphere 23 is connected to the connecting piece 21 through the sealed rotating bearing 22. The connecting piece 21 is connected to the flushing rod 10 through a threaded joint 20. A high-temperature and high-pressure flushing water pipe 25 is also provided in the rotating sphere 23. One end of the high-temperature and high-pressure flushing water pipe 25 is connected to the flushing rod 10, and the other end passes through the connecting piece 21 and the sealed rotating bearing 22 in sequence to enter the rotating sphere 23. The rotating sphere 23 is a hollow structure. A plurality of nozzles 24 are evenly distributed or staggered on the outer wall of the rotating sphere 23. The nozzle 24 is connected to the rotating sphere 23 with a hollow structure. The rotating sphere 23 rotates 360° around the sealed rotating bearing 22.

[0036] Three nozzles 24 are provided, which are arranged at an angle of 120° on the outer wall of the rotating sphere 23. The nozzles 24 are eccentrically arranged relative to the center line of the sealed rotating bearing 22, and the angles of the water spray are toward the same side. First, the reaction force of the water sprayed by the nozzles 24 is used to promote the automatic rotation of the rotating sphere 23, and second, it is used for cleaning at different heights.

[0037] The rotating nozzle 19 is made of 316L stainless steel. There are various types of rotating nozzles 19. Different rotating nozzles 19 are provided with different numbers of nozzles 24, different staggered angles of the nozzles 24, and different sizes of water outlets of the nozzles 24. In addition to fixed hard nozzles, the nozzles 24 also have soft nozzles, which present different states with different rotation speeds and pressures during rotation. The rotational friction force can also be adjusted by selecting different sealed rotating bearings 22 to adjust the rotation speed. A soft whip, such as a soft whip made of rubber material, can be installed on the rotating sphere 23 to beat and vibrate the inner cavity wall for cleaning during flushing. The nozzle can be replaced according to actual conditions and requirements for multiple cleanings to achieve rough cleaning, fine cleaning and other effects.

[0038] The use of the utility model:

[0039] 1. When online cleaning is required, pull the flushing rod 10 upward to the position (the position can be determined according to the distance scale 11 on the flushing rod 10) until the rotating nozzle 19 is completely retracted into the pressure relief cylinder 15, and then close the isolation ball valve 18 to prevent the oil and gas in the flotation tank 4 from leaking out. The pressure relief cylinder 15 is depressurized through the pressure relief port gauge valve 16. After the pressure relief is completed, the connecting flange between the pressure relief cylinder 15 and the isolation ball valve 18 is disassembled, and the rotating nozzle 19 can be replaced. After replacing the rotating nozzle 19, it is reset as it is, thereby realizing the replacement and cleaning under pressure. If there is no such requirement, the pressure relief cylinder 15 can be omitted, and the sealing cylinder 14 can be directly connected to the flotation tank 4. The length of the flushing rod 10 can be adjusted, and the cleaning operation can also be performed.

[0040] 2. When deep cleaning is required, isolate the flotation tank 4, that is, close the inlet and outlet valves of the flotation tank 4, open the closed exhaust valve of the flotation tank 4, isolate and depressurize the flotation tank 4, and reduce the liquid level to the lowest point; connect the sealing cylinder 14 and the pressure relief cylinder 15 to the isolation ball valve 18; open the isolation ball valve 18, press the flushing rod 10 downward, and the rotating nozzle 19 passes through the annular guide plate and is inserted into the inner cavity of the flotation tank 4; connect the delivery hose of high-temperature and high-pressure produced water or high-pressure cleaning agent from the quick connector 5 of the flushing rod 10 , open the isolation needle valve 6, adjust the flushing pressure, and start cleaning the flotation tank 4; adjust the depth of the rotating nozzle 19 inserted into the flotation tank 4 to achieve cleaning of different positions in the tank. It can be seen that the rotating nozzle 19 passes through the annular guide plate from top to bottom and enters the inner cavity of the flotation tank 4. Therefore, when the rotating nozzle 19 rotates and sprays water for cleaning, it can not only move down with the flushing rod 10 to any position of the inner cavity for cleaning, but also move upward to the position of the guide plate, thereby spraying water to clean the guide plate.

[0041] 3. When simple cleaning is required, there is no need to isolate the flotation tank 4. Only the amount of liquid entering the flotation tank 4 is reduced, and after the liquid level of the flotation tank 4 is lowered, the rotating nozzle 19 is connected for simple cleaning. Each cleaning only takes more than ten minutes. After the cleaning is completed, the flotation tank 4 can be immediately restored to normal use.

[0042] 4. When the rotary nozzle 19 needs to be replaced for cleaning, close the inlet needle valve 6 of the flushing rod 10, remove the quick connector 5 after pressure relief, and stop cleaning; pull the flushing rod 10 upwards, pull the rotary nozzle 19 into the pressure relief cylinder 15, and close the isolation ball valve 18; the pressure relief cylinder 15 is depressurized, the connecting flange between the pressure relief cylinder 15 and the isolation ball valve 18 is disassembled, and other types of rotary nozzles 19 are replaced; the pressure relief cylinder 15 is connected and installed with the isolation ball valve 18, and high-temperature and high-pressure produced water or cleaning agent is continued to be connected to clean the inner cavity and guide plate of the flotation tank 4.

[0043] The materials used in the production of the utility model are common materials in production, and the utility model has the characteristics of economy, safety and strong practicality.

Claims

1. An online cleaning device for a dehydration system flotation tank, characterized in that: The invention comprises a flushing rod (10), a rotating nozzle (19), a sealing cylinder (14) and a pressure relief cylinder (15); the sealing cylinder (14) is detachably sealedly connected to an isolation ball valve (18) at the top of an air flotation tank (4) through the pressure relief cylinder (15); a rotating nozzle (19) is provided at one end of the flushing rod (10); the end of the flushing rod (10) with the rotating nozzle (19) passes through the sealing cylinder (14), the pressure relief cylinder (15) and the isolation ball valve (18) in sequence and then enters the inner cavity of the air flotation tank (4); the rotating nozzle (19) can move up and down with the flushing rod (10); The length of the flushing rod (10) is greater than or equal to the sum of the lengths of the sealing cylinder (14), the pressure relief cylinder (15), the isolation ball valve (18) and the air flotation tank (4), and the flushing rod (10) is provided with a distance scale (11); A needle valve (6) and a check valve (7) are sequentially arranged on the connecting rod from the quick connector (5) end to the end connected to the flushing rod (10); The sealing cylinder (14), the pressure relief cylinder (15) and the isolation ball valve (18) are detachably connected via flanges and sealing gaskets; The sealing cylinder (14) is provided with a sealing gland (12) and a sealing filler (13) at the end away from the flange, and the flushing rod (10) can pass through the sealing gland (12) and the sealing filler (13) in the sealing gland (12).

2. According to claim 1, the online cleaning device for the dehydration system flotation tank is characterized by: The end of the flushing rod (10) away from the rotating spray head (19) is connected to a connecting rod, and the connecting end of the flushing rod (10) and the connecting rod is provided with a first pressure gauge (8) and a safety baffle (9).

3. According to claim 1, the online cleaning device for the dehydration system flotation tank is characterized by: The pressure relief cylinder (15) is connected to a pressure relief port gauge valve (16), and the pressure relief port gauge valve (16) is connected to a second pressure gauge (17).

4. According to claim 1, the online cleaning device for the dehydration system flotation tank is characterized by: The rotating spray head (19) comprises a rotating sphere (23), a nozzle (24) and a sealed rotating bearing (22); the rotating sphere (23) is connected to a connecting piece (21) via the sealed rotating bearing (22); the connecting piece (21) is connected to a flushing rod (10) via a threaded joint (20); a high-temperature and high-pressure flushing water pipe (25) is also arranged in the rotating sphere (23); and a plurality of nozzles (24) are evenly distributed or staggered on the outer wall of the rotating sphere (23).

5. The online cleaning device for the dehydration system flotation tank according to claim 4, characterized in that: One end of the high-temperature and high-pressure flushing water pipe (25) is connected to the flushing rod (10), and the other end passes through the connecting piece (21) and the sealed rotating bearing (22) in sequence and enters into the rotating sphere (23); the rotating sphere (23) is a hollow structure, and the nozzle (24) is connected to the hollow rotating sphere (23).

6. The online cleaning device for the air flotation tank of a dehydration system according to claim 4 or 5, characterized in that: The nozzles (24) are provided with three nozzles, which are arranged on the outer wall of the rotating sphere (23) at an angle of 120°.

7. The online cleaning device for the dehydration system flotation tank according to claim 6, characterized in that: The rotating sphere (23) is provided with a soft whip, which can beat and vibrate the inner cavity wall of the air flotation tank (4) for cleaning during flushing.

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