A medium filtration device for treating flowback liquid

Abstract

The invention belongs to the technical field of oil and gas field wastewater treatment, and specifically relates to a medium filtering device for treating return liquid, comprising a treatment tank, wherein the treatment tank is provided with a water inlet, a medium adding port, a water outlet and a support, and is characterized in that: the treatment tank comprises a lower tank body and an upper tank body, a plurality of intermediate bodies are installed between the lower tank body and the upper tank body, the lower tank body, the upper tank body and the intermediate body are all provided with a separation filter layer, a connecting groove and a connecting cylinder, the upper tank body is provided with a drain valve, the lower tank body, the upper tank body and the intermediate body are all filled with a medium layer, the intermediate body and the upper tank body are both provided with sealing gaskets at the bottom, the sealing gaskets are sleeved on the connecting cylinder, the connecting cylinder is provided with through holes, the intermediate body and the upper tank body are both fixedly installed with racks, the intermediate body and the lower tank body are both provided with regulators, the regulator is connected to the rack in a transmission manner to drive the rack to move, and is used to solve the problem that the backwashing efficiency of the current medium filtering equipment is low and different medium layers cannot be cleaned independently.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field wastewater treatment, and in particular relates to a medium filtering device for treating flowback liquid. Background Art

[0002] Shale gas is natural gas found in shale layers. It is an unconventional natural gas that is mainly extracted through hydraulic fracturing. Hydraulic fracturing is a method of extraction that uses high pressure to inject fracturing fluid into the ground to hydraulically break the formation, thereby releasing the oil or natural gas reserves in it. After the hydraulic fracturing construction is completed, some of the liquid will flow back to the ground. The liquid that flows back to the ground is called fracturing flowback fluid. The water consumption for fracturing a single shale gas well often reaches 20,000m 3 The above, before completion of the well, the return flow is 10%-50%, and in the production stage, it is still returned at a rate of ten to dozens of cubic meters per day, which lasts for the entire life cycle of the gas well. Since shale gas development often adopts the "cluster well" (platform) method for development, the return flow volume of the same platform will be greater. The treatment and disposal of shale gas fracturing return fluid has become a real problem that troubles oil and gas development companies.

[0003] As a common treatment method for backflow liquid, medium filtration can effectively remove suspended solids in water and has a significant removal effect on pollutants such as colloids, iron ions, organic matter, pesticides, manganese, bacteria, viruses, etc. It has the advantages of small filtration resistance, large specific surface area, strong acid and alkali resistance, oxidation resistance, pH range of 2 to 13, and good pollution resistance. After a period of use, pollutants in the water accumulate in the medium, causing the filtration effect to decline, and the filter medium needs to be backwashed.

[0004] At present, when the media filter is backwashed, cleaning water is injected from the drain port to backwash the media to remove attached pollutants, and the backwash wastewater is discharged from the water inlet. However, due to the large thickness of the filter medium, the backwash water penetration rate is slow and the backwash efficiency is low. At the same time, if the filter media installed in the filter tank are different, each medium layer cannot be cleaned independently. Summary of the invention

[0005] Based on the problems mentioned in the above background technology, the present invention provides a medium filtration device for backflow liquid treatment, which is used to solve the problem that the backwash efficiency of the current medium filtration equipment is low and different medium layers cannot be cleaned independently.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A medium filtering device for treating backflow liquid comprises a treatment tank, wherein the treatment tank is provided with a water inlet, a medium adding port, a water outlet and a support, wherein the treatment tank comprises a lower tank body and an upper tank body, wherein a plurality of intermediate bodies are installed between the lower tank body and the upper tank body, wherein the lower tank body, the upper tank body and the intermediate body are provided with a separation filter layer, a connecting groove and a connecting cylinder, wherein the connecting cylinder matches the connecting groove, wherein the lower tank body, the upper tank body and the intermediate body are filled with a medium layer, wherein the lower tank body, the upper tank body and the intermediate body are connected by the cooperation of the connecting groove and the connecting cylinder, wherein the lower tank body, the upper tank body and the intermediate body are filled with The medium layers are independent of each other, so that medium layers of different types or particle sizes can be separated. The upper tank body is provided with a drain valve. When backwashing, the drain valve can be opened to discharge the backwash wastewater. The intermediate body and the bottom of the upper tank body are provided with sealing gaskets, so that the lower tank body, the upper tank body or the intermediate body after connection have good sealing under the gravity pressure of the medium. The sealing gasket is sleeved on the connecting tube, and the connecting tube is provided with through holes. The intermediate body and the upper tank body are fixedly installed with racks, and the intermediate body and the lower tank body are provided with regulators. The regulator is connected to the rack for driving the rack to move.

[0008] On the basis of the above technical solution, the present invention also makes the following improvements:

[0009] Furthermore, the regulator includes a mounting frame, on which a turbine and a worm are mounted, the turbine corresponds to a rack, a gear is mounted on one end of the worm, and an adjusting ring is rotatably connected to the intermediate body and the lower tank body, and a half gear ring is provided on the adjusting ring, and the half gear ring corresponds to the gear. The turbine can be driven to rotate by rotating the adjusting ring, and the rack driven by the turbine drives the upper tank body or the intermediate body to move so as to separate the medium layer, and the lifted intermediate body or the upper tank body will not fall by itself, and the intermediate body or the upper tank body can be lowered by rotating the adjusting ring to squeeze the sealing gasket to improve the sealing performance.

[0010] Furthermore, a connecting piece is installed on the adjusting ring, and the adjusting ring is fixedly connected with a circular gripping ring through the connecting piece. The distance between the gripping ring and the side wall of the tank body is large, which is convenient for gripping and rotation.

[0011] Furthermore, the grip ring is coated with a rubber layer, which increases the friction resistance on the grip ring surface so that the grip ring can be rotated better.

[0012] Furthermore, the number of adjusters on the intermediate body and the lower tank body is at least three, and the adjusters are arranged at equal intervals, and the number of racks on the intermediate body and the upper tank body corresponds to the number of adjusters on the lower intermediate body or the lower tank body, and the racks are arranged at equal intervals. Rotating the grip ring can make multiple adjusters operate synchronously, and the intermediate body or the upper tank body can be easily moved by being subjected to force at multiple locations.

[0013] Furthermore, the lower tank body, the upper tank body and the intermediate body are all equipped with interception filters at the top of the medium layer. The medium layer is restricted by the interception filters to prevent the medium at the top of the medium layer from being disturbed by water flow during backwashing.

[0014] Furthermore, the intermediate body and the lower tank body are both provided with a plurality of cleaning holes connected to the connecting groove, so that impurities or media accidentally entering the connecting groove can be easily cleaned and will not accumulate in the connecting groove.

[0015] Furthermore, the bottom end of the cleaning hole and the bottom end of the connecting groove are coplanar and both are slope structures, so that waste water and residues can be removed more easily when cleaning the residues in the connecting groove.

[0016] Furthermore, the intermediate body and the lower tank body are provided with a guide groove below the cleaning hole. When cleaning the connecting groove or backwashing, the wastewater flowing down the side wall can enter the guide groove, and the wastewater is discharged centrally through the guide groove to prevent the wastewater from flowing around and affecting the placement environment of the filtering equipment.

[0017] Beneficial effects of the present invention:

[0018] 1. The lower tank, upper tank and intermediate body can be filled with filter media of different particle sizes or types. Under the action of the separation filter layer, each layer of media is isolated. The intermediate body or upper tank is driven by the regulator to move the rack to separate the adjacent media layers where the regulator is located. During backwashing, the separated upper or lower media layers can be cleaned separately to reduce the thickness of the media during backwashing so that the backwashing water can quickly pass through the media layer, resulting in a better cleaning effect. At the same time, it can avoid mixing of filter media of different particle sizes or types during backwashing to damage the filter layer;

[0019] 2. The lower tank body, upper tank body and intermediate body are detachable, and the filter media in the lower tank body, upper tank body and intermediate body can be replaced or adjusted separately, so as to change the filtering effect of the overall filter media. At the same time, the number of intermediate bodies can be selected to determine the number of medium layers, which can meet different usage requirements;

[0020] 3. Under the action of the medium gravity, the sealing gasket can make the adjacent lower tank body, upper tank body and intermediate body closely connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0022] Figure 1 This is a schematic structural diagram of a medium filtration device for treating backflow liquid in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 3 It is a schematic diagram of the longitudinal structure of a medium filtering device for treating backflow liquid in an embodiment of the present invention;

[0025] Figure 4 A longitudinal cross-sectional structural diagram of a medium filter device for treating backwash liquid during backwashing in an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 6 This is a schematic diagram of the longitudinal cross-section structure of the intermediate in an embodiment of the present invention;

[0028] The main component symbols are described as follows:

[0029] Medium layer 10, lower tank body 11, support 111, water outlet 112, intermediate body 12, upper tank body 13, water inlet 131, medium addition port 132, drain valve 133, separation filter layer 14, connecting tube 15, through hole 151, connecting groove 16, cleaning hole 17, guide groove 18, regulator 2, rack 21, mounting frame 22, turbine 23, worm 24, gear 25, holding ring 26, adjusting ring 27, connecting piece 28, half gear ring 29. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] like Figures 1 to 6As shown, a medium filtering device for treating backflow liquid includes a treatment tank, on which a water inlet 131, a medium adding port 132, a water outlet 112 and a support 111 are provided. The treatment tank includes a lower tank body 11 and an upper tank body 13. The water inlet 131 and the medium adding port 132 are provided on the upper tank body 13. The filter medium is added into the upper tank body 13 and the backflow liquid to be treated is injected into the upper tank body 13 through the medium adding port 132. A plurality of intermediate bodies 12 are installed between the lower tank body 11 and the upper tank body 13. The water outlet 112 and the support 111 are provided on the lower tank body 11. The water outlet 112 is used to discharge the treated backflow liquid. The support 111 supports the treatment tank off the ground to facilitate the collection of treated water. The lower tank body 11, the upper tank body 13 and the intermediate body 12 are all provided with a separation filter layer 14, a connecting groove 16 and a connecting tube 15, and the connecting tube 15 matches the connecting groove 16. The lower tank body 11, the upper tank body 13 and the intermediate body 12 are all filled with a medium layer 10, and the filtering accuracy of each medium layer 10 is gradually improved from top to bottom. The lower tank body 11, the upper tank body 13 and the intermediate body 12 are connected by the cooperation of the connecting groove 16 and the connecting tube 15. After the connection, the medium layers 10 filled in the lower tank body 11, the upper tank body 13 and the intermediate body 12 are independent of each other, so that the medium layers 10 of different types or particle sizes can be separated. A drain valve 133 is provided on the body 13. When backwashing, the drain valve 133 can be opened to discharge the backwash wastewater in the upper tank body 13. Sealing gaskets are provided at the bottom of the intermediate body 12 and the upper tank body 13, so that the lower tank body 11, the upper tank body 13 or the intermediate body 12 after connection have good sealing under the gravity pressure of the medium. The sealing gasket is sleeved on the connecting tube 15, and the connecting tube 15 is provided with a through hole 151. The intermediate body 12 and the upper tank body 13 are fixedly installed with a rack 21, and the intermediate body 12 and the lower tank body 11 are provided with a regulator 2. The regulator 2 is transmission-connected to the rack 21 to drive the rack 21 to move.

[0032] Specifically, the regulator 2 includes a mounting frame 22, on which a turbine 23 and a worm 24 are mounted, the turbine 23 corresponds to the rack 21, a gear 25 is mounted at one end of the worm 24, and an adjusting ring 27 is rotatably connected to the intermediate body 12 and the lower tank body 11, and a half gear ring 29 is provided on the adjusting ring 27, and the half gear ring 9 corresponds to the gear 25. The turbine 23 can be driven to rotate by rotating the adjusting ring 27, and the rack driven by the turbine 23 drives the upper tank body 13 or the intermediate body 12 to move so as to separate the medium layer 10. The lifted intermediate body 12 or the upper tank body 13 will not fall down by itself. Meanwhile, the intermediate body 12 or the upper tank body 13 can be lowered by rotating the adjusting ring 27 to squeeze the sealing gasket to improve the sealing performance. A connecting piece 28 is installed on the adjusting ring 27, and the adjusting ring 27 is fixedly connected to a circular gripping ring 26 through the connecting piece 28. The distance between the gripping ring 26 and the side wall of the tank body is large so as to facilitate gripping. In order to better rotate the gripping ring 26, the gripping ring 26 is coated with a rubber layer, and the friction resistance on the surface of the gripping ring 26 is increased by the rubber layer.

[0033] Specifically, the number of adjusters 2 on the intermediate body 12 and the lower tank body 11 is at least three, and the adjusters 2 are arranged at equal intervals. In this example, the number of adjusters 2 on each intermediate body 12 and the lower tank body 11 is preferably three, and the spacing between adjacent adjusters 2 is 120°. The number of racks 21 on the intermediate body 12 and the upper tank body 13 corresponds to the number of adjusters 2 on the lower intermediate body 12 or the lower tank body 11, and the racks 21 are arranged at equal intervals. Rotating the holding ring 26 can make the three adjusters 2 operate synchronously, and the intermediate body 12 or the upper tank body 13 is subjected to force at three locations together to make it easier to move.

[0034] Specifically, interception filters are installed at the top of the medium layer 10 in the lower tank body 11, the upper tank body 13 and the intermediate body 12. The medium layer 10 is restricted by the interception filter to prevent the medium on the top of the medium layer 10 from being disturbed by water flow during backwashing.

[0035] Specifically, the intermediate body 12 and the lower tank body 11 are provided with a plurality of cleaning holes 17 connected to the connection groove 16, so that impurities or media accidentally entering the connection groove 16 can be easily cleaned and will not accumulate in the connection groove 16; wherein, the bottom ends of the cleaning holes 17 and the bottom ends of the connection groove 16 are coplanar and both have a slope structure, so that waste water and residues can be more easily removed when cleaning the residues in the connection groove 16.

[0036] Specifically, a guide groove 18 is provided on the intermediate body 12 and the lower tank body 11 below the cleaning hole 17. When cleaning the connecting groove 16 or backwashing, the wastewater flowing down the side wall can enter the guide groove 18, and the wastewater is discharged centrally through the guide groove 18 to prevent the wastewater from flowing around and affecting the placement environment of the filtering equipment.

[0037] During installation, the number of intermediate bodies 12 and the material and particle size of the corresponding medium layer 10 are set as required, and then the corresponding filter media are filled in the lower tank body 11, the intermediate body 12 and the upper tank body 13 respectively, and then the lower tank body 11, the intermediate body 12 and the upper tank body 13 (such as the lower tank body 11, the intermediate body 12 and the upper tank body 13) are completed by inserting the connecting tube 15 into the connecting groove 16. Figure 3 After the connection, the rack 21 on the intermediate body 12 or the upper tank body 13 is inserted into the lower adjacent mounting frame 22 and meshes with the turbine 23 (as shown in FIG. Figure 2 As shown), after the lower tank body 11, the intermediate body 12 and the upper tank body 13 are connected, the filtering accuracy of each medium layer 10 is gradually improved from top to bottom, and the rack 21 is driven downward by rotating the holding ring 26 to squeeze the sealing gasket to improve the sealing performance.

[0038] When in use, waste water to be treated is injected into the upper tank body 13 from the water inlet 131 , and the waste water is filtered through each medium layer and then discharged from the water outlet 112 .

[0039] When backwashing, the medium layer 10 to be cleaned is separated. For example, when the medium layer 10 in the upper tank body 13 needs to be cleaned, the holding ring 26 of the intermediate body 12 adjacent to the lower part of the upper tank body 13 is rotated to drive the upper tank body 13 to rise, and the through hole 151 of the connecting tube 15 of the upper tank body 13 is exposed. Then, cleaning water is injected from the through hole 15. Since the filtration accuracy of the upper medium layer is lower than that of the lower one, that is, the gap in the upper medium layer is larger than the gap in the lower medium layer, most of the cleaning water injected from the through hole 15 will pass through the upper tank body 13. The medium layer 10 inside is backwashed, and the backwash waste water is discharged from the drain valve 133; when cleaning the medium layer 10 of the intermediate body 12, the intermediate body 12 is driven to rise by rotating the holding ring 26, and then the cleaning water is injected from the through hole 151 below the intermediate body 12, and the cleaning waste water is discharged from the through hole 15 of the adjacent intermediate body 12 or the upper tank body 13 above the intermediate body 12; when cleaning the medium layer 10 in the lower tank body 11, the cleaning water is injected from the water outlet 112, and the cleaned waste water is discharged from the through hole 15 of the adjacent upper intermediate body 12.

[0040] The above is a detailed introduction to a medium filtration device for backflow liquid treatment provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A medium filtration device for treating backflow liquid, comprising a treatment tank, wherein the treatment tank is provided with a water inlet (131), a medium addition port (132), a water outlet (112) and a support (111), characterized in that: The treatment tank comprises a lower tank body (11) and an upper tank body (13), a plurality of intermediate bodies (12) are installed between the lower tank body (11) and the upper tank body (13), the lower tank body (11), the upper tank body (13) and the intermediate body (12) are all provided with a separation filter layer (14), a connecting groove (16) and a connecting cylinder (15), the upper tank body (13) is provided with a drain valve (133), the lower tank body (11), the upper tank body (13) and the intermediate body (12) are all filled with a medium layer (10), the filtering accuracy of each medium layer (10) is gradually improved from top to bottom, the connecting cylinder (15) is matched with the connecting groove (16), the bottom of the intermediate body (12) and the upper tank body (13) are both provided with a sealing gasket, the sealing gasket is sleeved on the connecting cylinder (15), the connecting cylinder (15) A through hole (151) is provided on each of the intermediate body (12) and the upper tank body (13); a rack (21) is fixedly mounted on each of the intermediate body (12) and the upper tank body (13); an adjuster (2) is provided on each of the intermediate body (12) and the lower tank body (11); the adjuster (2) is transmission-connected with the rack (21) for driving the rack (21) to move; the adjuster (2) comprises a mounting frame (22); a turbine (23) and a worm (24) are mounted on the mounting frame (22); the turbine (23) corresponds to the rack (21); a gear (25) is mounted on one end of the worm (24); an adjusting ring (27) is rotationally connected to each of the intermediate body (12) and the lower tank body (11); a half gear ring (29) is provided on the adjusting ring (27); the half gear ring (29) corresponds to the gear (25).

2. A medium filtration device for treating flowback fluid according to claim 1, characterized in that: A connecting piece (28) is installed on the adjusting ring (27), and the adjusting ring (27) is fixedly connected to a holding ring (26) which is cut into a circular shape through the connecting piece (28).

3. A medium filtration device for treating flowback fluid according to claim 2, characterized in that: The grip ring (26) is coated with a rubber layer.

4. A medium filtration device for treating flowback fluid according to claim 3, characterized in that: The number of the regulators (2) on the intermediate body (12) and the lower tank body (11) is at least three, and the regulators (2) are arranged at equal intervals; the number of the racks (21) on the intermediate body (12) and the upper tank body (13) corresponds to the number of the regulators (2) on the lower intermediate body (12) or the lower tank body (11), and the racks (21) are arranged at equal intervals.

5. A medium filtration device for treating flowback fluid according to claim 4, characterized in that: The lower tank body (11), the upper tank body (13) and the intermediate body (12) are all equipped with interception filters at the top of the medium layer (10).

6. A medium filtration device for treating flowback fluid according to claim 1, characterized in that: The intermediate body (12) and the lower tank body (11) are both provided with a plurality of cleaning holes (17) which are in communication with the connecting groove (16).

7. A medium filtration device for treating flowback fluid according to claim 6, characterized in that: The bottom end of the cleaning hole (17) and the bottom end of the connecting groove (16) are coplanar and both have slope structures.

8. A medium filtration device for treating flowback fluid according to claim 7, characterized in that: The intermediate body (12) and the lower tank body (11) are provided with a guide groove (18) below the cleaning hole (17).

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