A sand cleaning device matched with a separator

Abstract

The utility model discloses a sand purifier is matched with separator, including with the separator's discharge pipeline, the other end of discharge pipeline is connected sand trap, be provided with the flush pipe nozzle in the sand trap, the sand trap is connected sand -removing hydraulic cyclone through the first pipeline, sand -removing hydraulic cyclone is connected with sand trap through the first pipeline, the sand trap is connected sand -removing hydraulic cyclone through the second pipeline, the bottom of sand -removing hydraulic cyclone is provided with sand collecting hopper, sand collecting hopper is connected with sand trap through overflow recovery pipeline, through directly with the separator butt joint, through the oil -laden sand in the separator is introduced to the sand trap and is cleaned, and under the common effect of sand -removing hydraulic cyclone and sand -removing hydraulic cyclone, the crude oil in oil -laden sand and the sand are purified and separated, make the mineral oil content index of the cleaned sand of agricultural sludge, and also can recover crude oil resources, eliminate environmental pollution.

Description

Technical Field

[0001] This utility model relates to the field of oil sand treatment technology, specifically to a sand cleaning and purification device for use with a separator. Background Technology

[0002] During surface production in oil and gas fields, various separators (two-phase, three-phase, or multi-phase separators) are used to separate the oil and sand mixture produced from oil wells. After a long period of separation, oil sludge usually accumulates at the bottom of the separator. This sludge usually contains a certain amount of crude oil. In order to avoid environmental pollution, the sludge usually needs to be purified to meet the discharge standards.

[0003] Due to the density difference and immiscibility of the produced fluids (oil, gas, water, and sand) in oil wells, various media will form different layers within the separator, from top to bottom: natural gas, crude oil, water, and silt. Therefore, before being removed from the separator, this silt is immersed in the produced water for a considerable period, giving it an inherent advantage in removing oil. However, in many oilfield operations both domestically and internationally, the oily silt removed from the separator is often not purified in a timely manner. The treatment methods are mostly: collecting it in sedimentation tanks or oil sludge ponds, or mixing it with oily sludge collected from various parts of the oilfield and handing it over to a third party for processing. The main problems arising from this are: the aging of the crude oil on the surface of the silt increases the difficulty of processing it; and the mixing of the silt with other crude oil contaminants leads to secondary pollution, resulting in oil and gas losses and environmental pollution. Utility Model Content

[0004] The purpose of this invention is to provide a sand cleaning and purification device for use with a separator, so as to solve the above-mentioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sand cleaning and purification device for a separator includes a discharge pipe connected to the separator, the other end of the discharge pipe connected to a settling tank, a flushing nozzle installed inside the settling tank, the settling tank connected to a desanding hydrocyclone via a first pipe, the desanding hydrocyclone connected to the settling tank via a first pipe, the settling tank connected to a desanding hydrocyclone via a second pipe, a sand collecting hopper at the bottom of the desanding hydrocyclone, and the sand collecting hopper connected to the settling tank via an overflow recovery pipe.

[0007] The aforementioned settling tank includes a tank body, and two vertically arranged partitions are provided inside the tank body. The two partitions divide the space inside the tank body from left to right into a first sand washing chamber, an overflow chamber, and a second sand washing chamber.

[0008] As mentioned above, there are two sets of rinsing nozzles, which are respectively placed in the first sand washing chamber and the second sand washing chamber.

[0009] As mentioned above, the first sand washing chamber, the second sand washing chamber, and the overflow chamber are all equipped with electric heaters, liquid level gauges, water inlets, and sewage outlets.

[0010] As described above, the first sand washing chamber is equipped with a first slurry pump, the second sand washing chamber is equipped with a second slurry pump, and the overflow chamber is equipped with a submersible pump.

[0011] As mentioned above, the outlet pipeline of the first slurry pump is divided into two branches. One branch is connected to the flushing nozzle in the first sand washing chamber, and the other branch is connected to the desanding hydrocyclone through the first pipeline.

[0012] As mentioned above, the outlet pipeline of the second slurry pump is divided into two branches. One branch is connected to the flushing nozzle in the second sand washing chamber, and the other branch is connected to the desanding hydrocyclone through the second pipeline.

[0013] As mentioned above, the outlet pipeline of the submersible pump is divided into three branches: the first branch is connected to the separator, the second branch is connected to the production system in the station, and the third branch is connected to the first sand washing chamber.

[0014] As mentioned above, both the discharge pipe and the outlet pipe of the submersible pump are equipped with observation windows.

[0015] As described above, the flushing nozzle has multiple water outlets, and a sand-proof cylinder is fitted on the outside of the flushing nozzle. The sand-proof cylinder has multiple openings, and each of the multiple openings corresponds to one of the multiple water outlets. A driving mechanism is connected to the sand-proof cylinder, and the driving mechanism drives the sand-proof cylinder to rotate around the axis of the flushing nozzle.

[0016] The beneficial effects of this utility model are as follows: In the above technical solution, the sand cleaning and purification device for a separator provided by this utility model directly connects to the separator, introduces the oily mud and sand in the separator into the settling tank for cleaning, and under the combined action of the desanding hydrocyclone and the sand removal hydrocyclone, the crude oil and mud and sand in the oily mud and sand are purified and separated, so that the cleaned mud and sand meet the mineral oil content index of agricultural sludge, and can also recover crude oil resources and eliminate environmental pollution. Attached Figure Description

[0017] 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of a sand cleaning and purification device for a separator provided in this embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the flushing nozzle provided in an embodiment of the present utility model;

[0020] Figure 3 A schematic diagram illustrating the fit between the flushing nozzle and the sandproof cylinder provided in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram showing the state of the sand-proof cylinder when the flushing nozzle is closed, as provided in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Desanding hydrocyclone; 2. Sand removal hydrocyclone; 3. Settling tank; 4. First slurry pump; 5. Second slurry pump; 6. Submersible pump; 7. Electric heater; 8. Observation window; 9. Sand collection hopper; 10. First sand washing chamber; 11. Second sand washing chamber; 12. Overflow chamber; 13. Flushing nozzle; 131. Water outlet; 14. Discharge pipe; 15. First pipe; 16. Second pipe; 17. Overflow recovery pipe; 18. Production system; 19. Sand guard; 20. Opening; 21. Drive mechanism; 22. Separator. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the following will be described in conjunction with the appendix. Figure 1-4 This invention will now be described in further detail.

[0025] This utility model embodiment provides a sand cleaning and purification device for a separator, including a discharge pipe 14 connected to the separator 22, the other end of the discharge pipe 14 connected to a settling tank 3, a flushing nozzle 13 provided in the settling tank 3, the settling tank 3 connected to a desanding hydrocyclone 1 through a first pipe 15, the desanding hydrocyclone 1 connected to the settling tank 3 through the first pipe 15, the settling tank 3 connected to a desanding hydrocyclone 2 through a second pipe 16, a sand collecting hopper 9 provided at the bottom of the desanding hydrocyclone 2, and the sand collecting hopper 9 connected to the settling tank 3 through an overflow recovery pipe 17.

[0026] Specifically, existing oil wells require a separator 22 to separate oil, gas, water, and sand after extraction. During this separation, the media within the separator 22 typically stratifies due to their density differences and immiscibility. From top to bottom, the media in the separator 22 consist of natural gas, crude oil, water, and mud / sand. The mud / sand within the separator 22 is soaked in the extracted water for an extended period before being removed. Furthermore, oil is typically hydrophobic and insoluble in water. When oil comes into contact with mud / sand, the presence of water prevents the oil from adhering to the surface of the mud / sand. Excessive accumulation gives the oil-bearing mud and sand an inherent advantage in clearing oil. However, in existing oilfield stations, most of the oil-bearing mud and sand removed from separator 22 is not purified in a timely manner during production. The treatment methods are mostly: collecting it in sedimentation tanks or oil sludge tanks, or mixing it with oil sludge collected from various parts of the oilfield and handing it over to a third party for treatment. This causes the crude oil on the surface of the mud and sand to age, increasing the difficulty of treating the oil-bearing mud and sand. Furthermore, because the mud and sand are mixed with other crude oil contaminants, secondary pollution is likely to occur, leading to oil and gas losses and environmental pollution problems.

[0027] Preferably, the settling tank 3 includes a tank body, and two vertically arranged partitions are provided inside the tank body. The two partitions divide the space inside the tank body from left to right into a first sand washing chamber 10, an overflow chamber 12 and a second sand washing chamber 11.

[0028] The rinsing nozzle 13 is provided in two sets, and the two sets of rinsing nozzles 13 are respectively placed in the first sand washing chamber 10 and the second sand washing chamber 11.

[0029] The first sand washing chamber 10, the second sand washing chamber 11, and the overflow chamber 12 are all equipped with electric heaters 7, liquid level gauges, water inlets, and drain outlets.

[0030] The first sand washing chamber 10 is equipped with a first slurry pump 4, the second sand washing chamber 11 is equipped with a second slurry pump 5, and the overflow chamber 12 is equipped with a submersible pump 6.

[0031] The outlet pipeline of the first slurry pump 4 is divided into two branches. One branch is connected to the flushing nozzle 13 in the first sand washing chamber 10, and the other branch is connected to the desanding hydrocyclone 1 through the first pipeline 15.

[0032] The outlet pipeline of the second slurry pump 5 is divided into two branches. One branch is connected to the flushing nozzle 13 in the second sand washing chamber 11, and the other branch is connected to the desanding hydrocyclone 2 through the second pipeline 16.

[0033] The outlet pipeline of the submersible pump 6 is divided into three branches: the first branch is connected to the separator 22, the second branch is connected to the production system 18 in the station, and the third branch is connected to the first sand washing chamber 10.

[0034] Both the discharge pipe 14 and the outlet pipe of the submersible pump 6 are equipped with observation windows 8.

[0035] Specifically, the steps for purifying the mud and sand at the bottom of separator 22 are as follows:

[0036] Step one: The worker fills the three chambers of the settling tank 3 (i.e., the first sand washing chamber 10, the second sand washing chamber 11, and the overflow chamber 12) with clean water, ensuring that each chamber is two-thirds full. Simultaneously, the electric heaters 7 in the three chambers are turned on to heat the water to approximately 80°C. The worker then connects the discharge pipe 14 to the separator 22, completing the preparatory work before sand cleaning. (In this embodiment, the discharge pipe 14 and the separator 22 are detachably connected, and the discharge pipe...) The connection point between 14 and separator 22 is located at the bottom of separator 22. When separator 22 is working normally, the bottom of separator 22 is in a closed state. When it is necessary to clean the mud and sand at the bottom of separator 22, after separator 22 is connected to discharge pipe 14, a channel will be opened at the bottom of separator 22 to allow the mud and sand at the bottom of separator 22 to enter discharge pipe 14. The controllable channel at the bottom of separator 22 can be realized by an electric control valve (this is existing technology, and its principle will not be described in detail).

[0037] Step two: Submersible pump 6 starts working, delivering clean water into separator 22. The clean water enters separator 22, fluidizing the mud and sand deposited at the bottom of separator 22. The connection between submersible pump 6 and separator 22 is usually located in the middle area of ​​the side of separator 22. The water flow impacts the mud and sand at the bottom of separator 22 from top to bottom, causing it to be suspended and fluidized in the aqueous phase. The operation time of submersible pump 6 is usually controlled to be 2 to 5 minutes. After the sand flushing is completed, submersible pump 6 stops temporarily, and the connection between submersible pump 6 and separator 22 is closed. This closure can still be achieved by an electrically controlled valve. The fluidized mud and sand enter the first sand washing chamber 10 of sand settling tank 3 through discharge pipe 14. It should be noted that the mud, sand and water mixture entering the first sand washing chamber 10 must not exceed the high liquid level alarm value of the chamber. The liquid level in the first sand washing chamber 10 is monitored by a liquid level instrument.

[0038] Step three: The flushing nozzle 13 in the first sand washing chamber 10 begins operation. The flushing nozzle 13 pressurizes the water via the first slurry pump, then sprays it out at high speed from the nozzle. The high-pressure water flow has high kinetic energy, directly impacting sand particles and sediments, dispersing them from their adhered surfaces or accumulation points. The impact force of the water flow can strip impurities from the surface of the sand particles, while simultaneously breaking up the deposited sand layer, loosening it and suspending it in the liquid. Under the powerful flushing of hot water and the flushing nozzle 13, this process is maintained for approximately 5 minutes. Afterward, the first slurry pump 4 is activated to further purify the first sand washing chamber 10. The mud-sand-water mixture is then transported to the desanding hydrocyclone 1. The desanding hydrocyclone 1 uses the centrifugal separation principle to separate the mud and sand from the water, and introduces the separated mud and sand into the second sand washing chamber 11 to complete the primary purification treatment of the mud and sand. (It should be noted that the desanding hydrocyclone 1 includes inlet, overflow and bottom outlet valves. The cleaning water from the overflow of the desanding hydrocyclone 1 can be introduced into different chambers in the settling tank 3 according to the level of oil content: if the oil content is small, it is introduced into the first sand washing chamber 10; if the oil content is large, it is introduced into the overflow chamber 12.)

[0039] Step four: The flushing nozzle 13 in the second sand washing chamber 11 starts working. Under the strong flushing of hot water and the flushing nozzle 13, it is maintained for about 5 minutes. After that, the second slurry pump 5 is started to transport the mud-sand-water mixture after secondary purification in the second sand washing chamber 11 to the desanding hydrocyclone 2. The desanding hydrocyclone 2 uses the centrifugal separation principle to separate the mud and sand from the water. The mud and sand dewatered by the desanding hydrocyclone 2 enters the sand collection hopper 9. Then, the staff puts the purified mud and sand in the sand collection hopper 9 into bags for storage and transports it out regularly to complete the purification treatment of mud and sand. In addition, the secondary sand washing water separated by the desanding hydrocyclone 2 is discharged back into the second sand washing chamber 11.

[0040] Step 5: Repeat steps 2 to 4 until no obvious sand-containing liquid is visible in the observation window 8 on the discharge pipe 14, which means that the sand discharge operation in the separator 22 is complete.

[0041] It should be noted that after completing the above steps, clean water needs to be added to the first sand washing chamber 10 and the second sand washing chamber 11 so that the crude oil in the sand washing liquid in the first sand washing chamber 10 and the second sand washing chamber 11 overflows into the overflow chamber 12. Then, the pipeline channel between the submersible pump 6 and the production system 18 is opened, and the submersible pump pumps the crude oil overflowing into the overflow chamber 12 back to the production system 18 to avoid waste of crude oil.

[0042] It should be noted that, compared to the second sand washing chamber 11, the mud and sand water in the first sand washing chamber 10 contains more crude oil. When the flushing nozzle 13 is placed in the first sand washing chamber 10 for a long time, the mud and sand particles in the first sand washing chamber 10 will gradually deposit around the flushing nozzle 13, causing the flow channel of the flushing nozzle 13 to narrow or even become blocked. This reduces the flow rate and pressure of the water, affecting the flushing effect. Furthermore, because the mud and sand contain crude oil, the crude oil in the mud and sand will adhere to the surface of the flushing nozzle 13 and mix with the mud and sand to form oily sludge that is difficult to clean. This can easily aggravate the blockage and affect the cleaning effect on the oily mud and sand.

[0043] To solve the above problems, preferably, the flushing nozzle 13 is provided with multiple water outlets 131, and a sand-proof cylinder 19 is sleeved on the outside of the flushing nozzle 13. The sand-proof cylinder 19 is provided with multiple openings 20, and the multiple openings 20 correspond one-to-one with the multiple water outlets 131. A driving mechanism 21 is connected to the sand-proof cylinder 19, and the driving mechanism 21 drives the sand-proof cylinder 19 to rotate around the axis of the flushing nozzle 13.

[0044] Specifically, when the flushing nozzle 13 is working, the 20 on the sand shield 19 is misaligned with the water outlet 131 on the flushing nozzle 13. At this time, the inner wall of the sand shield 19 blocks the water outlet 131 on the flushing nozzle 13, preventing oily mud and sand in the first sand washing chamber 10 from entering the water outlet 131 on the flushing nozzle 13, thus preventing mud and sand from clogging the water outlet 131 on the flushing nozzle 13. The drive mechanism 21 can be a waterproof and oil-proof drive motor, which is installed in the first sand washing chamber 10. On the inner wall of the sand chamber 10, a drive gear is installed on the output shaft of the drive motor. The drive gear meshes with a mating gear. The mating gear is coaxial with and fixedly connected to the sand-proof cylinder 19. When it is necessary to rinse and purify the mud and sand in the first sand washing chamber 10, the drive motor drives the sand-proof cylinder 19 to rotate on the rinsing nozzle 13. The opening 20 on the sand-proof cylinder 19 is offset from the water outlet 131 on the rinsing nozzle 13. The water jet from the rinsing nozzle 13 sprays out to perform primary purification treatment on the oily mud and sand in the first sand washing chamber 10.

[0045] Similarly, the flushing nozzle 13 in the second sand washing chamber 11 can also be equipped with a sand-proof cylinder 19. Here, the specific structure of the flushing nozzle 13 and the sand-proof cylinder 19 in the second sand washing chamber 11 will not be further explained.

[0046] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sand cleaning and purification device for use with a separator, characterized in that, The device includes a discharge pipe connected to a separator, the other end of which is connected to a settling tank. The settling tank is equipped with a flushing nozzle. The settling tank is connected to a desanding hydrocyclone via a first pipe. The desanding hydrocyclone is connected to the settling tank via a first pipe. The settling tank is connected to a desanding hydrocyclone via a second pipe. The bottom of the desanding hydrocyclone is equipped with a sand collecting hopper. The sand collecting hopper is connected to the settling tank via an overflow recovery pipe.

2. The sand cleaning and purification device for a separator according to claim 1, characterized in that, The settling tank includes a tank body, and two vertically arranged partitions are provided inside the tank body. The two partitions divide the space inside the tank body from left to right into a first sand washing chamber, an overflow chamber and a second sand washing chamber.

3. The sand cleaning and purification device for a separator according to claim 2, characterized in that, The rinsing nozzles are provided in two sets, which are respectively placed in the first sand washing chamber and the second sand washing chamber.

4. A sand cleaning and purification device for a separator according to claim 2, characterized in that, The first sand washing chamber, the second sand washing chamber, and the overflow chamber are all equipped with electric heaters, liquid level gauges, water inlets, and sewage outlets.

5. A sand cleaning and purification device for a separator according to claim 2, characterized in that, The first sand washing chamber is equipped with a first slurry pump, the second sand washing chamber is equipped with a second slurry pump, and the overflow chamber is equipped with a submersible pump.

6. A sand cleaning and purification device for a separator according to claim 5, characterized in that, The outlet pipeline of the first slurry pump is divided into two branches. One branch is connected to the flushing nozzle in the first sand washing chamber, and the other branch is connected to the desanding hydrocyclone through the first pipeline.

7. A sand cleaning and purification device for a separator according to claim 5, characterized in that, The outlet pipeline of the second slurry pump is divided into two branches. One branch is connected to the flushing nozzle in the second sand washing chamber, and the other branch is connected to the desanding hydrocyclone through the second pipeline.

8. A sand cleaning and purification device for a separator according to claim 5, characterized in that, The outlet pipeline of the submersible pump is divided into three branches: the first branch is connected to the separator, the second branch is connected to the production system in the station, and the third branch is connected to the first sand washing chamber.

9. A sand cleaning and purification device for a separator according to claim 8, characterized in that, Both the discharge pipe and the outlet pipe of the submersible pump are equipped with observation windows.

10. A sand cleaning and purification device for a separator according to claim 1, characterized in that, The flushing nozzle has multiple water outlets, and a sand-proof cylinder is fitted on the outside of the flushing nozzle. The sand-proof cylinder has multiple openings, and each of the multiple openings corresponds to one of the multiple water outlets. A driving mechanism is connected to the sand-proof cylinder, and the driving mechanism drives the sand-proof cylinder to rotate around the axis of the flushing nozzle.

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