A drainage oil filter groove for a coal bed methane surface extraction well

Abstract

The utility model discloses a kind of drainage oil filter tank for coalbed methane surface extraction well, it is related to oil filter tank technical field, including settling chamber, the top of the settling chamber is equipped with liquid inlet pipe, and the lower part of side wall is equipped with drain valve, the top of the settling chamber is equipped with openable and closable opening and closing assembly, detachable filter assembly is arranged in the settling chamber, the bottom of the settling chamber is equipped with inclined plate for accelerating oil-water separation, the bottom of the settling chamber is equipped with oil collection tank. The utility model is by being equipped with inclined plate and filter assembly, oil drop only needs the vertical spacing between two inclined plates to reach the lower surface of inclined plate, then slide up along inclined plate and gather, and oil drop in water is actively adsorbed by oil absorption bar, while not absorbing moisture, by woven mesh structure, can maximize the contact opportunity with oil drop, and the internal complex pore is also conducive to capturing and locking oil drop.

Description

Technical Field

[0001] This utility model relates to the field of oil filter tank technology, specifically a drainage oil filter tank for coalbed methane surface extraction wells. Background Technology

[0002] Coalbed methane (commonly known as gas) is an important unconventional natural gas resource, and its surface extraction is of great significance for ensuring safe coal mine production and increasing the supply of clean energy. During the surface extraction process, a large amount of formation water is produced along with the coalbed methane. This extracted water usually contains a large amount of light oil (condensate oil), coal dust, and other impurities.

[0003] An existing patent (authorization announcement number: CN221344131U) discloses an oil-water separator. The key technical point of the solution is that by setting multiple filter baffles of different heights in the purification zone, the wastewater filtered from the oil storage zone is filtered multiple times and then filtered again through the filter, achieving four-stage filtration. This results in good filtration effect, relatively low cost in improving oil-water separation effect, and no need for regular cleaning of the oil tank.

[0004] However, the above technical solutions still have certain defects. The oil layer floating on the water surface after separation requires a special collection device, and the four-stage settling process is slow. Moreover, the ability to capture dispersed and fine oil droplets is limited, resulting in a high oil content in the effluent, which is difficult to meet the standards for subsequent treatment or discharge. Therefore, a drainage oil filter tank for coalbed methane surface extraction wells is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a drainage oil filter tank for coalbed methane surface extraction wells to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A drainage and oil filter tank for coalbed methane surface extraction wells includes a settling chamber, an inlet pipe at the top of the settling chamber, a drain valve at the lower part of the side wall, an openable and closable opening and closing assembly at the top of the settling chamber, a detachable filter assembly inside the settling chamber, an inclined plate at the bottom of the settling chamber for accelerating oil-water separation, and an oil collection tank at the bottom of the settling chamber. The filter assembly includes a fixed rod that is fixedly installed on the inner wall of the settling chamber. A hook is hung on the fixed rod. A limit block is installed on the side of the hook. A baffle is connected to the side of the limit block near the hook by a torsion spring. A limit frame is fixedly installed on the side of the limit block away from the hook. An oil suction plate is connected inside the limit frame.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: As a further embodiment of this utility model: the opening and closing assembly includes a cover plate hinged to the top of the settling chamber, and a locking plate fixed on the opposite side; a fixing plate is fixed to the top of the settling chamber corresponding to the position of the locking plate, the fixing plate has a slot, and the locking plate has a locking block that can be locked into the slot.

[0008] As a further improvement of this utility model, the card block is made of an elastic material.

[0009] As a further embodiment of this utility model: the oil collection tank is located at the bottom of the settling chamber, and includes an upward-opening oil collection cavity. The oil collection cavity is connected to the clear water chamber below through a channel equipped with a filter. A filter basket is detachably installed in the clear water chamber.

[0010] As a further embodiment of this utility model: multiple sets of inclined plates are provided, and the inclined plates are arranged parallel to each other, with the angle between the inclined plates and the horizontal plane being 45° to 60°.

[0011] As a further improvement of this utility model: the oil-absorbing rail is made of an oleophilic and hydrophobic polymer material, which has a woven mesh structure.

[0012] As a further improvement of this utility model, the settling chamber is made of corrosion-resistant carbon steel.

[0013] As a further improvement of this invention: the side walls and bottom of the filter basket are mesh structures. A bolt is provided at the top, extending downwards through the bottom of the filter basket and connecting to a limiting plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By setting up inclined plates and a filter assembly, oil droplets can reach the lower surface of the inclined plates with only a vertical distance between the two inclined plates. Then, they slide upward along the inclined plates and gather. The oil droplets in the water are actively adsorbed by the oil absorption rails, while not absorbing water. The woven mesh structure maximizes the contact opportunities with oil droplets, and the intricate pores inside are also conducive to capturing and locking oil droplets.

[0015] 2. This utility model, through a three-stage purification process of setting up an oil collection tank, collecting oil through overflow from the oil collection chamber, blocking solids with a channel filter, and fine filtration with a filter basket, ensures that the water discharged from the clear water chamber is clear with extremely low oil and suspended solids content, meeting environmental protection discharge or reuse standards. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the primary settling chamber of this utility model; Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle; Figure 4 For the present utility model Figure 2 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the structure of the clear water chamber of this utility model.

[0017] Attached image labels: 1. Settling chamber; 2. Drain valve; 3. Opening / closing assembly; 4. Filter assembly; 5. Inclined plate; 6. Filter plate; 7. Oil collection tank; 31. Fixing plate; 32. Clamping plate; 33. Clamping block; 41. Fixing rod; 42. Hook; 43. Limiting block; 44. Baffle; 45. Limiting frame; 46. Oil suction plate; 71. Oil collecting chamber; 72. Filter; 73. Clear water chamber; 74. Filter basket; 75. Limiting plate; 76. Bolts. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] In one embodiment, such as Figures 1-5 As shown, a drainage oil filter tank for coalbed methane surface extraction wells includes a settling chamber 1, an inlet pipe at the top of the settling chamber 1, a drain valve 2 at the lower part of the side wall, an openable and closable opening and closing assembly 3 at the top of the settling chamber 1, a detachable filter assembly 4 inside the settling chamber 1, an inclined plate 5 for accelerating oil-water separation at the bottom of the settling chamber 1, and an oil collection tank 7 at the bottom of the settling chamber 1. In this embodiment, oil-containing coalbed methane produced water enters the settling chamber 1 through the top inlet pipe. Due to the different densities of oil, water, and solid particles (oil is the lightest and solids are the heaviest), they begin to naturally stratify within the settling chamber 1 under the influence of gravity: large solid particles settle to the bottom, oil droplets float to the top, and relatively clean water is located in the middle. The inclined plate 5 provides a large surface area and a narrow flow channel. As the floating tiny oil droplets pass through the channel of the inclined plate 5, they are more likely to collide with each other and coalesce (merge) into larger oil droplets, thereby accelerating the oil-water separation process. At this time, the water flows through the detachable filter assembly 4, and the oil layer that accumulates at the top of the liquid surface enters the oil collection tank 7. The clean water, after multi-stage treatment, is located in the lower middle part of the settling chamber 1 and is discharged centrally.

[0020] In one embodiment, such as Figure 3As shown, the filter assembly 4 includes a fixed rod 41 fixedly installed on the inner wall of the settling chamber 1. The settling chamber 1 is made of corrosion-resistant carbon steel. A hook 42 is hung on the fixed rod 41. A limiting block 43 is installed on the side of the hook 42. A baffle 44 is connected to the side of the limiting block 43 near the hook 42 via a torsion spring. A limiting frame 45 is fixedly installed on the side of the limiting block 43 away from the hook 42. An oil-absorbing rail 46 is connected inside the limiting frame 45. The oil-absorbing rail 46 is made of an oleophilic and hydrophobic polymer material and has a woven mesh structure. All components (limiting blocks 43) are connected by hanging the hook 42 onto the fixed rod 41. The baffle 44, the limiting frame 45, and the oil-absorbing baffle 46 are all installed on the inner wall of the settling chamber 1. When disassembling, only the baffle 44 needs to be lifted to complete the disassembly and installation of the hook 42. When the oil-absorbing baffle 46 is fully placed, the baffle 44 will automatically spring back due to the restoring force of the torsion spring, closing the rear end of the opening of the limiting frame 45, thereby preventing the oil-absorbing baffle 46 from accidentally falling out under the impact of liquid flow. When oily water flows through this component, the oil-absorbing baffle 46 will actively absorb the oil droplets in the water, while hardly absorbing any water. Through the woven mesh structure, it can maximize the contact opportunity with oil droplets, and the intricate pores inside are also conducive to capturing and locking oil droplets.

[0021] In one embodiment, such as Figure 4 As shown, the opening and closing assembly 3 includes a cover plate hinged to the top of the settling chamber 1, and a locking plate 32 fixed on the opposite side; a fixing plate 31 is fixed to the top of the settling chamber 1 corresponding to the locking plate 32, the fixing plate 31 has a slot, and the locking plate 32 has a locking block 33 that can be locked into the slot. The locking block 33 is made of elastic material. When the operator flips the cover plate downward from the hinged side, the locking plate 32 fixed on the other side of the cover plate is aligned with the fixing plate 31 on the top of the settling chamber 1. When the cover plate is pressed down, the locking block 33 at the front end of the locking plate 32 will contact the edge of the slot on the fixing plate 31. Since the locking block 33 is made of elastic material, under the downward pressure, the locking block 33 will undergo elastic deformation and slide over the edge of the fixing plate 31. Once the locking block 33 disengages from the slot, the entire cover plate can be easily flipped open around the hinge axis, providing a complete maintenance passage.

[0022] In one embodiment, such as Figure 5As shown, the oil collection tank 7 is located at the bottom of the settling chamber 1, and includes an upward-opening oil collection cavity 71. The oil collection cavity 71 is connected to the lower clear water chamber 73 through a channel equipped with a filter 72. A filter basket 74 is detachably installed in the clear water chamber 73. The side walls and bottom of the filter basket 74 are mesh structures. A bolt 76 is provided at the top of the filter basket 74, which penetrates downward through the bottom of the filter basket 74 and is connected to a limiting plate 75. The oil collection cavity 71 is located at the bottom of the settling chamber 1 and is kept upward-opening. By controlling the drainage speed or liquid level, the floating oil in the upper layer can overflow into the oil collection cavity 71 through this upward opening. The liquid in the oil collection cavity 71 will flow into the lower clear water chamber 73 through the channel of the filter 72. At this time, the liquid must pass through the mesh side walls and bottom of the filter basket 74 to be discharged. This filter basket 74 plays a role in secondary fine filtration, capturing these fine particles and ensuring that the final discharged water is clean. The filter basket 74 is fixed by the bolt 76 at the top. Rotating the bolt will pull the limiting plate 75 connected to its bottom upwards, thus firmly pressing the filter basket 74 onto the base or bracket of the clear water chamber 73, preventing it from swaying or floating in the water. When it is necessary to clean solid impurities inside the filter basket 74, simply loosen the top bolt 76 to lower the limiting plate 75, and the entire filter basket 74 can be easily lifted out of the clear water chamber 73. After cleaning, put it back and tighten it to secure it.

[0023] In one embodiment, such as Figure 2 As shown, multiple sets of inclined plates 5 are provided, and the inclined plates 5 are arranged parallel to each other. The angle between the inclined plates 5 and the horizontal plane is 45° to 60°. Oil droplets only need to float up the vertical distance between two inclined plates 5 to reach the lower surface of the inclined plate 5, and then slide upward along the inclined plate 5 to gather. When the oily wastewater flows between the channels of the inclined plates 5, the dispersed tiny oil droplets will collide and merge with each other during the upward process, and agglomerate into larger oil droplets. According to Stokes' law, the larger the diameter of the oil droplet, the faster its floating speed. Once the oil droplets come into contact with the lower surface of the inclined plate 5, they will adhere to it and slide upward along the plate surface, eventually gathering on the liquid surface to form a floating oil layer, which is then discharged through the drain valve 2.

[0024] The above embodiment discloses a drainage oil filter tank for coalbed methane surface extraction wells. The produced water, containing oil and solid particles, from the coalbed methane well enters the settling chamber 1 through the top inlet pipe. Under gravity, the densest solid particles begin to slowly settle to the bottom of the cone. Simultaneously, the least dense oil droplets begin to float naturally, and the water flows downwards through the inclined plate 5 area. This process greatly increases the separation area. Tiny oil droplets collide and coalesce into larger droplets within the inclined plate 5 channel, rapidly rising to the surface to form a floating oil layer. The inclined plate 5 also accelerates the settling of solid particles. Residual tiny oil droplets in the water are actively adsorbed and captured by the oleophilic and hydrophobic material of the oil suction baffle 46, achieving deep oil removal. The floating oil overflows or is guided to the oil collection chamber 71 of the oil collection tank 7. After a preliminary filtration, the oil is recovered. The deeply purified water enters the clear water chamber 73 and then undergoes final filtration through the filter basket 74 before being discharged.

[0025] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A drainage and oil filter tank for coalbed methane surface extraction wells, comprising a settling chamber (1), wherein the settling chamber (1) is provided with an inlet pipe at the top and a drain valve (2) at the lower part of the side wall, characterized in that, The settling chamber (1) is provided with an openable and closable assembly (3) at the top, a detachable filter assembly (4) is provided inside the settling chamber (1), an inclined plate (5) for accelerating oil-water separation is provided at the bottom of the settling chamber (1), and an oil collection tank (7) is provided at the bottom of the settling chamber (1). The filter assembly (4) includes a fixed rod (41) fixedly installed on the inner wall of the settling chamber (1). A hook (42) is hung on the fixed rod (41). A limit block (43) is installed on the side of the hook (42). A baffle (44) is connected to the side of the limit block (43) near the hook (42) by a torsion spring. A limit frame (45) is fixedly installed on the side of the limit block (43) away from the hook (42). An oil suction plate (46) is connected inside the limit frame (45).

2. The drainage and oil filter tank for coalbed methane surface extraction wells according to claim 1, characterized in that, The opening and closing assembly (3) includes a cover plate hinged to the top of the settling chamber (1) and a locking plate (32) fixed on the opposite side; a fixing plate (31) is fixed on the top of the settling chamber (1) at the position corresponding to the locking plate (32), the fixing plate (31) is provided with a slot, and the locking plate (32) is provided with a locking block (33) that can be locked into the slot.

3. A drainage and oil filter tank for coalbed methane surface extraction wells according to claim 2, characterized in that, The card block (33) is made of an elastic material.

4. A drainage and oil filter tank for coalbed methane surface extraction wells according to claim 1, characterized in that, The oil collection tank (7) is located at the bottom of the settling chamber (1), and includes an upward-opening oil collection cavity (71). The oil collection cavity (71) is connected to the clear water chamber (73) below through a channel equipped with a filter (72). A filter basket (74) is detachably provided in the clear water chamber (73).

5. A drainage and oil filter tank for coalbed methane surface extraction wells according to claim 1, characterized in that, The inclined plate (5) is provided in multiple sets, and the inclined plates (5) are arranged parallel to each other. The angle between the inclined plate (5) and the horizontal plane is 45° to 60°.

6. A drainage and oil filter tank for coalbed methane surface extraction wells according to claim 1, characterized in that, The oil-absorbing bar (46) is made of oleophilic and hydrophobic polymer material, which is a woven mesh structure.

7. A drainage and oil filter tank for coalbed methane surface extraction wells according to claim 1, characterized in that, The settling chamber (1) is made of corrosion-resistant carbon steel.

8. A drainage and oil filter tank for coalbed methane surface extraction wells according to claim 4, characterized in that, The sidewalls and bottom of the filter basket (74) are mesh structures, and a bolt (76) is provided at the top of the basket. The bolt penetrates downward through the bottom of the filter basket (74) and is connected to a limiting plate (75).

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