An oil and gas field fracturing flow-back fluid harmless purification device

Abstract

The present application relates to the field of sewage purification, especially to a harmless purification device for fracturing flowback fluid in oil and gas fields, comprising a base and a cylinder; the base is fixedly connected with the cylinder; the cylinder is provided with a water outlet; further comprising a fixed pipe, a filter screen and an annular cylinder; the fixed pipe is provided with a water inlet; the cylinder is fixedly connected with the fixed pipe; the fixed pipe is detachably connected with the filter screen; the fixed pipe is fixedly connected with the annular cylinder, and the annular cylinder is located in the cylinder. In the initial stage, the annular plate is attached to the lower side of the filter membrane; after the photocatalytic membrane I and the photocatalytic membrane II are spliced and aligned, the plurality of spliced photocatalytic membranes I and photocatalytic membranes II perform graded filtration on the sewage; at this time, the electric push rod IV drives the annular plate and the electromagnetic valve to move downward, so that the annular plate removes the blockage of the filter membrane, and then a temporary storage cavity is formed between the lower side of the filter membrane and the upper side of the annular plate, and the filtered clean water continuously seeps into the temporary storage cavity for temporary storage.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification, and in particular to a harmless purification device for fracturing flowback fluid from oil and gas fields. Background Technology

[0002] Oil and gas field fracturing flowback fluid refers to the liquid returned to the surface from the well after hydraulic fracturing operations. This liquid contains the fracturing fluid originally injected into the formation, as well as groundwater or oil present in the reservoir. Because materials from the underground rock formation dissolve into the liquid during fracturing, the flowback fluid has a complex composition and often contains high concentrations of contaminants. Therefore, the flowback fluid wastewater needs to be purified before discharge. Current technology typically uses photocatalytic membranes to decompose and degrade organic matter in the wastewater. However, since photocatalytic membranes rely on light for sterilization and purification, and existing photocatalytic membranes have relatively small areas, their purification and filtration efficiency is low. Summary of the Invention

[0003] In order to overcome the shortcomings of existing photocatalytic membranes, which have relatively small area and low purification and filtration efficiency, this invention provides a harmless purification device for oil and gas field fracturing flowback fluid.

[0004] The technical solution is: a harmless purification device for fracturing flowback fluid in oil and gas fields, comprising a base and a cylinder; the cylinder is fixedly connected to the base; the cylinder is provided with an outlet; it also includes a fixed pipe, a filter screen, an annular cylinder, an electroluminescent element, photocatalytic membrane I, photocatalytic membrane II, an electric push rod I, a connecting ring I, a connecting rod I, an annular plate, a solenoid valve, and a primary purification component; the fixed pipe is provided with an inlet; the fixed pipe is fixedly connected to the cylinder; the filter screen is detachably connected to the fixed pipe; the annular cylinder is fixedly connected to the fixed pipe, and the annular cylinder is located inside the cylinder, with the inner side of the annular cylinder being opaque and the outer side being transparent; the annular cylinder has an annular receiving cavity; the cylinder is fixedly connected to the filter screen; ... filter screen is located inside the cylinder, with the annular cylinder being located inside the cylinder, and the inner side of the annular cylinder being opaque and the outer side being transparent; the annular cylinder has an annular receiving cavity; the filter screen is fixedly connected to the filter screen; the annular cylinder is located inside the cylinder, with the inner side of the annular cylinder being opaque and the outer side being transparent; the annular cylinder has an annular receiving cavity; the filter screen is fixedly connected to the The cylinder is equipped with several electroluminescent bodies located within a containment cavity; several photocatalytic membranes I are connected to the outer wall of the annular cylinder; several photocatalytic membranes II are slidably connected to the inner wall of the cylinder, with photocatalytic membranes II and I interleaved; an electric push rod I is fixedly connected to the cylinder; a connecting ring I is fixedly connected to the telescopic end of the electric push rod I; several connecting rods I are fixedly connected to the connecting ring I, and the connecting rods I are fixedly connected to all photocatalytic membranes II; an annular plate is connected to the cylinder, and the annular plate is located below the lowest photocatalytic membrane II; several solenoid valves are fixedly connected to the annular plate; and a primary purification assembly for primary filtration of the return liquid is connected to the cylinder.

[0005] Furthermore, the primary purification component includes a microbial membrane, a hollow tube, a one-way valve, an electric actuator II, a cover plate, an electric actuator III, and a push plate; the cylinder is fixedly connected to the electric actuator II; the telescopic end of the electric actuator II is fixedly connected to the cover plate; the cover plate is connected to several microbial membranes, and the microbial membranes are located inside the annular cylinder; the cylinder is fixedly connected to the hollow tube, and the hollow tube is slidably connected to the cover plate, and the hollow tube extends into the interior of the annular cylinder; the hollow tube is fixedly connected to several one-way valves, and the one-way valves only allow gas to flow from the inside to the outside of the hollow tube; the cylinder is fixedly connected to the electric actuator III, and the telescopic end of the electric actuator III is slidably connected to the cover plate; the telescopic end of the electric actuator III is fixedly connected to the push plate, and the push plate is slidably connected to the annular cylinder, and the push plate has several circular holes for the microbial membrane and the hollow tube to pass through.

[0006] Furthermore, the cross-sections of photocatalytic membrane I and photocatalytic membrane II are inclined with the inner side lower than the outer side.

[0007] Furthermore, a reflective layer is provided on the inner side of the cylinder.

[0008] Furthermore, the inner wall of the receiving cavity is configured as a concave shape.

[0009] Furthermore, it also includes a conveying pipe; the cylinder is connected to the conveying pipe.

[0010] Furthermore, it also includes an electric push rod IV and a filter membrane; several electric push rods IV are fixedly connected to the cylinder body, and the telescopic ends of all electric push rods IV are fixedly connected to the annular plate; the filter membrane is fixedly connected to the cylinder body, and the filter membrane is located below the lowest photocatalytic membrane II, and the filter membrane is located above the annular plate.

[0011] Furthermore, it also includes a top cover and lifting lugs; the top cover is detachably connected to the upper end of the cylinder, and the top cover is fixedly connected to the hollow tube, and an exhaust valve is provided on the top cover; the top cover is fixedly connected to several lifting lugs.

[0012] Furthermore, it also includes an electric push rod V, a connecting ring II, and a connecting rod II; the electric push rod V is fixedly connected to the cylinder body; the telescopic end of the electric push rod V is fixedly connected to the connecting ring II; the connecting ring II is fixedly connected to several connecting rods II, and the connecting rods II pass through the annular plate and the filter membrane and are fixedly connected to all the photocatalytic membranes I; the photocatalytic membranes I are slidably connected to the outside of the annular cylinder; the annular cylinder has several annular grooves.

[0013] Furthermore, cleaning cotton is provided on both the inner annular surface of photocatalytic membrane I and the outer annular surface of photocatalytic membrane II.

[0014] The beneficial effects of this invention are as follows: After the microbial membrane performs primary purification of wastewater, the electric push rod III drives the push plate to move upward, causing the push plate to push the wastewater in the annular cylinder upward, pushing all the primary purified wastewater out into the annular cavity formed between the outer side of the annular cylinder, the inner side of the cylinder, and the annular plate. The microbial membrane and hollow tube pass through the corresponding circular holes on the push plate, allowing the wastewater to flow downward into the annular cavity under its own gravity through the gaps formed by the staggered photocatalytic membranes I and II. At this time, the wastewater level in the annular cavity is close to the upper end of the annular cylinder. Then, the electric push rod I is controlled to drive the connecting ring I, connecting rod I, and photocatalytic membrane II upward until the photocatalytic membranes I and II are completely aligned, thereby increasing the overall area of ​​the photocatalytic membranes I and II after splicing.

[0015] Initially, the annular plate is attached to the lower side of the filter membrane. After the photocatalytic membrane I and photocatalytic membrane II are spliced ​​and aligned, multiple spliced ​​photocatalytic membranes I and II perform graded filtration of wastewater. At this time, the electric push rod IV is controlled to move the annular plate and the solenoid valve downward, so that the annular plate releases its obstruction to the filter membrane, thereby forming a temporary storage cavity between the lower side of the filter membrane and the upper side of the annular plate. The clean water filtered by the filter membrane continuously seeps into the temporary storage cavity for temporary storage.

[0016] Oxygen is supplied to the hollow tube by an external air pump, and then discharged from the one-way valve into the annular cylinder. This allows the oxygen to come into contact with the microorganisms on the surface of the biofilm, promoting their metabolism and improving the purification effect. The wastewater is then further purified by photocatalytic membranes I and II, greatly enhancing the purification effect. Using the biofilm as a pretreatment can remove most of the suspended solids and colloids, reducing the risk of fouling of the subsequent photocatalytic membrane. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the cylinder of the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention.

[0019] Figure 3 This is a schematic diagram of the first internal partial structure of the cylinder of the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention.

[0020] Figure 4 This is a schematic diagram of the second type of internal partial structure of the cylinder of the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention.

[0021] Figure 5 This is a partial structural diagram of the combination of the annular cylinder and the electroluminescent body in the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention.

[0022] Figure 6 This is a partial structural diagram of the combination of the annular cylinder, photocatalytic membrane I, and photocatalytic membrane II in the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention.

[0023] Figure 7 This is a diagram showing the operational status of the oil and gas field fracturing flowback fluid harmless purification device disclosed in this invention.

[0024] Reference numerals: 1-Base, 11-Inlet, 12-Outlet, 2-Cylinder, 21-Top Cover, 22-Lifting Lug, 101-Fixing Pipe, 102-Filter Screen, 103-Annular Cylinder, 104-Electroluminescent Organoid, 105-Microbial Membrane, 106-Photocatalytic Membrane I, 107-Photocatalytic Membrane II, 108-Electric Push Rod I, 109-Hollow Tube, 1010-One-Way Valve, 1011-Transport Pipe, 1 012-Connecting ring I, 1013-Connecting rod I, 1014-Electric push rod IV, 1015-Annular plate, 1016-Solenoid valve, 1017-Filter membrane, 1018-Electric push rod II, 1019-Cover plate, 1020-Electric push rod III, 1021-Push plate, 201-Electric push rod V, 202-Connecting ring II, 203-Connecting rod II, 1031-Receiving cavity, 1032-Annular groove. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1: A harmless purification device for fracturing flowback fluid in oil and gas fields, such as... Figures 1-7 As shown, it includes a base 1 and a cylinder 2; the base 1 is fixedly connected to the cylinder 2; the cylinder 2 is provided with a water outlet 12;

[0027] It also includes a fixed pipe 101, a filter screen 102, an annular cylinder 103, an electroluminescent body 104, a photocatalytic membrane I 106, a photocatalytic membrane II 107, an electric push rod I 108, a connecting ring I 1012, a connecting rod I 1013, an annular plate 1015, a solenoid valve 1016, and a primary purification assembly; the fixed pipe 101 is provided with an inlet 11; the cylinder 2 is fixedly connected to the fixed pipe 101; the filter screen 102 is detachably connected to the fixed pipe 101; the annular cylinder 103 is fixedly connected to the fixed pipe 101, and the annular cylinder 103 is located inside the cylinder 2, and the inner side of the annular cylinder 103 is opaque, while the outer side of the annular cylinder 103 is transparent; the annular cylinder 103 has an annular receiving cavity 1031; the cylinder 2 is fixedly connected to a plurality of annularly distributed electroluminescent bodies 104, and the electroluminescent bodies 104 are located in the receiving cavity. Inside 1031; several vertically distributed photocatalytic membranes I 106 are connected to the outer wall of the annular cylinder 103; several vertically distributed photocatalytic membranes II 107 are slidably connected to the inner wall of the cylinder 2, and the photocatalytic membranes II 107 and I 106 are interleaved; an electric push rod I 108 is bolted to the cylinder 2; a connecting ring I 1012 is fixed to the telescopic end of the electric push rod I 108; two connecting rods I 1013 are fixed to the connecting ring I 1012, and the connecting rods I 1013 are fixed to all the photocatalytic membranes II 107; an annular plate 1015 is connected to the cylinder 2, and the annular plate 1015 is located below the lowest photocatalytic membrane II 107; several solenoid valves 1016 are fixed to the annular plate 1015; a primary purification component for primary filtration of the return liquid is connected to the cylinder 2.

[0028] The primary purification assembly includes a microbial membrane 105, a hollow tube 109, a one-way valve 1010, an electric push rod II 1018, a cover plate 1019, an electric push rod III 1020, and a push plate 1021. The cylinder 2 is bolted to the electric push rod II 1018; the telescopic end of the electric push rod II 1018 is fixedly connected to the cover plate 1019; the cover plate 1019 is connected to several annularly distributed microbial membranes 105, and the microbial membranes 105 are located inside the annular cylinder 103; the cylinder 2 is fixedly connected to the hollow tube 109, and the hollow tube 109 is slidably connected to the cover plate 1019, and the hollow tube... The core tube 109 is inserted into the annular cylinder 103; several one-way valves 1010 are fixedly connected to the hollow tube 109, and the one-way valves 1010 only allow gas to flow from the inside to the outside of the hollow tube 109; the cylinder 2 is bolted to an electric push rod III 1020, and the telescopic end of the electric push rod III 1020 is slidably connected to the cover plate 1019; the telescopic end of the electric push rod III 1020 is fixedly connected to a push plate 1021, and the push plate 1021 is slidably connected to the annular cylinder 103, and the push plate 1021 has several round holes for the microbial film 105 and the hollow tube 109 to pass through.

[0029] The cross-sections of photocatalytic membrane I 106 and photocatalytic membrane II 107 are inclined with the inner side lower than the outer side, which increases the irradiation efficiency of the electroluminescent body 104 on photocatalytic membrane I 106 and photocatalytic membrane II 107, thereby improving the water purification efficiency.

[0030] A reflective layer is provided on the inner side of the cylinder 2.

[0031] The inner wall of the cavity 1031 is set to a concave shape, which scatters the light emitted by the electroluminescent body 104 to the microbial membrane 105, photocatalytic membrane I 106, and photocatalytic membrane II 107 in all directions, thereby increasing the irradiation range and improving the light efficiency.

[0032] It also includes a conveying pipe 1011; the cylinder 2 is connected to the conveying pipe 1011.

[0033] It also includes an electric push rod IV1014 and a filter membrane 1017; the cylinder 2 is bolted with two electric push rods IV1014, and the telescopic ends of all electric push rods IV1014 are fixedly connected to the annular plate 1015; the filter membrane 1017 is fixedly connected to the cylinder 2, and the filter membrane 1017 is located below the lowest photocatalytic membrane II107, and the filter membrane 1017 is located above the annular plate 1015.

[0034] It also includes a top cover 21 and lifting lugs 22; the top cover 21 is detachably connected to the upper end of the cylinder 2, and the top cover 21 is fixedly connected to the hollow tube 109. An exhaust valve is provided on the top cover 21; several lifting lugs 22 are fixedly connected to the top cover 21.

[0035] In use, an external pump is connected to a fixed pipe 101, and an external delivery pump is connected to a delivery pipe 1011. After microorganisms are planted on the surface of the microbial membrane 105, the microbial membrane 105 is placed inside the annular cylinder 103. Initially, the cover plate 1019 seals the upper end of the annular cylinder 103. Photocatalytic membranes I 106 and II 107 are staggered, and the solenoid valve 1016 is in the closed state. Then, the external pump delivers the oil and gas field fracturing flowback fluid wastewater upward through the inlet 11 of the fixed pipe 101 to the annular cylinder 103. Inside the annular cylinder 103, the filter screen 102 performs coarse filtration of particulate impurities in the wastewater. Then, the wastewater continues to flow upward through the filter screen 102 until it fills the interior of the annular cylinder 103. At this time, the wastewater is immersed in the annular cylinder 103 and comes into contact with the surface of the microbial membrane 105. Since the microbial membrane 105 is composed of microbial communities attached to the base membrane medium, these microorganisms decompose the organic matter in the wastewater into carbon dioxide, water and other harmless small molecules through metabolic processes. The wastewater is then subjected to primary purification through the microbial membrane 105.

[0036] After the wastewater has been purified in the annular cylinder 103 for a predetermined time (e.g., thirty minutes), the electric push rod II 1018 is first controlled to move the cover plate 1019 upward, causing the cover plate 1019 to disengage from the upper end of the annular cylinder 103, thus opening the upper end of the annular cylinder 103. Subsequently, the electric push rod III 1020 is controlled to move the push plate 1021 upward, causing the push plate 1021 to push the wastewater in the annular cylinder 103 upward, pushing all the initially purified wastewater out into the annular cavity formed between the outer side of the annular cylinder 103, the inner side of the cylinder 2, and the annular plate 1015. Inside, the microbial membrane 105 and the hollow tube 109 pass through the corresponding circular holes on the push plate 1021, allowing the wastewater to flow downwards into the annular cavity under its own gravity through the gaps formed by the staggered intersecting photocatalytic membranes I 106 and II 107. At this time, the wastewater level in the annular cavity is close to the upper end of the annular cylinder 103. Then, the electric push rod I 108 drives the connecting ring I 1012, the connecting rod I 1013, and the photocatalytic membrane II 107 to move upwards until the photocatalytic membranes I 106 and II 107 are completely aligned. Figure 7 As shown, this increases the overall area of ​​the photocatalytic membrane I 106 and photocatalytic membrane II 107 after splicing, and separates and filters the wastewater. At this time, a second batch of wastewater is introduced into the annular cylinder 103 by an external pump, so that the microbial membrane 105 continues to perform primary purification of the second batch of wastewater. Subsequently, the electroluminescent body 104 is energized, so that the electroluminescent body 104 emits ultraviolet light, which shines through the outside of the transparent annular cylinder 103 onto the upper surface of the photocatalytic membrane I 106 and photocatalytic membrane II 107, thereby making the photocatalytic membrane I 106 and photocatalytic membrane II 107 more effective. The hydroxyl radicals generated by the photocatalyst (titanium dioxide) in the catalytic membrane II 107 oxidize, degrade, and sterilize the organic matter in the wastewater. At the same time, the tiny impurities in the wastewater are finely filtered through the photocatalytic membrane I 106 and the photocatalytic membrane II 107, thus thoroughly purifying the wastewater. After purification, the solenoid valve 1016 is opened, allowing the purified water to flow out of the cylinder 2 through the outlet 12 after passing through the annular plate 1015. It should be noted that the inner side of the annular cylinder 103 is opaque to prevent ultraviolet light from affecting the microbial membrane 105.

[0037] The pusher plate 1021 pushes the sewage in the annular cylinder 103 upward. When the microbial membrane 105 and the hollow tube 109 pass through the corresponding circular holes on the pusher plate 1021, the relative movement between the pusher plate 1021 and the microbial membrane 105, the hollow tube 109 and the inner wall of the annular cylinder 103 causes the pusher plate 1021 to scrape off the impurities and dirt adhering to the surface of the microbial membrane 105, the surface of the hollow tube 109 and the inner wall of the annular cylinder 103, thereby achieving a cleaning effect on the surface of the microbial membrane 105, the surface of the hollow tube 109 and the inner wall of the annular cylinder 103.

[0038] Initially, the annular plate 1015 is attached to the lower side of the filter membrane 1017. After the photocatalytic membrane I 106 and photocatalytic membrane II 107 are spliced ​​and aligned, multiple spliced ​​photocatalytic membranes I 106 and photocatalytic membrane II 107 perform graded filtration of wastewater. At this time, the electric push rod IV 1014 is controlled to move the annular plate 1015 and the solenoid valve 1016 downward, so that the annular plate 1015 releases its obstruction of the filter membrane 1017, thereby forming a temporary storage cavity between the lower side of the filter membrane 1017 and the upper side of the annular plate 1015. The clean water filtered by the filter membrane 1017 continuously seeps into the temporary storage cavity for temporary storage.

[0039] When light irradiates the photocatalytic membranes I 106 and II 107, the hydroxyl radicals generated by the photocatalyst (titanium dioxide) oxidize and degrade the organic matter. During purification, an external pump is controlled to introduce liquid hydrogen peroxide into the aforementioned annular cavity through the delivery pipe 1011 to oxidize and purify the wastewater. At the same time, the light irradiation accelerates the decomposition of hydrogen peroxide on the photocatalytic membranes I 106 and II 107, generating more highly oxidizing hydroxyl radicals, thereby improving the removal effect on recalcitrant organic matter. Meanwhile, the oxygen generated by the decomposition of hydrogen peroxide is insoluble in wastewater, so the oxygen rises and is discharged through the exhaust valve on the top cover 21, preventing the gas pressure inside the cylinder 2 from continuously increasing and causing safety hazards.

[0040] During the primary purification process of the microbial membrane 105, oxygen is supplied to the hollow tube 109 through an external air pump, and the oxygen is discharged from the one-way valve 1010 into the annular cylinder 103. This allows the oxygen to come into contact with the microorganisms on the surface of the microbial membrane 105, promoting the metabolism of the microorganisms and improving the purification effect. The wastewater is then further purified by the photocatalytic membrane I 106 and the photocatalytic membrane II 107, which greatly improves the purification effect. The carbon dioxide gas and excess oxygen produced by the metabolism of the microorganisms accumulate in the annular cylinder 103 and backwash the filter screen 102 downwards, flushing out the particulate impurities attached to the filter screen 102 and achieving self-cleaning of the filter screen 102.

[0041] With a reflective layer installed on the inner side of the cylinder 2, when the ultraviolet light emitted by the electroluminescent body 104 passes through the annular cylinder 103 and irradiates the photocatalytic membrane I 106 and photocatalytic membrane II 107, the light is reflected back to the photocatalytic membrane I 106 and photocatalytic membrane II 107 through the reflective layer when it reaches the inner wall of the cylinder 2, thereby improving the light utilization rate and thus improving the photocatalytic purification effect.

[0042] After long-term use, the microbial film 105 needs to be replaced and maintained. At this time, the external hoisting equipment is fixed to the lifting lug 22, and the top cover 21 is manually removed from the top of the cylinder 2 to release the fixation between the top cover 21 and the cylinder 2. Then, the external hoisting equipment drives the top cover 21 and its connected parts to move upward through the lifting lug 22, so that the top cover 21 pulls the microbial film 105 out of the annular cylinder 103, which facilitates the replacement and maintenance of the microbial film 105.

[0043] Example 2, based on Example 1, such as Figures 3-4 and Figures 6-7 As shown, it also includes an electric push rod V201, a connecting ring II202, and a connecting rod II203; the cylinder 2 is bolted to the electric push rod V201; the telescopic end of the electric push rod V201 is fixed to the connecting ring II202; the connecting ring II202 is fixed to several connecting rods II203, and the connecting rods II203 pass through the annular plate 1015 and the filter membrane 1017 and are fixed to all the photocatalytic membranes I106; the photocatalytic membranes I106 are slidably connected to the outside of the annular cylinder 103; the annular cylinder 103 is provided with several annular grooves 1032.

[0044] Cleaning cotton is provided on the inner annular surface of photocatalytic membrane I 106 and the outer annular surface of photocatalytic membrane II 107.

[0045] After the purification process is completed, photocatalytic membranes I106 and II107 need to be cleaned. First, control the solenoid valve 1016 to open, then control the electric push rod I108 to move the connecting ring I1012 and connecting rod I1013 downwards, causing the connecting rod I1013 to move the photocatalytic membrane II107 downwards to its initial external position. This results in photocatalytic membranes I106 and II107 being initially misaligned. Subsequently, control the electric push rod V201 to move the connecting ring II202 and connecting rod II203 downwards, causing the photocatalytic membrane I106, initially positioned above the annular groove 1032, to be aligned with the annular groove 1032. The middle part of 032 is flush, which creates a gap between the inner side of the photocatalytic membrane I 106 and the outer side of the annular groove 1032. Then, an external pump delivers clean water into the annular cavity described in Example 1 through a delivery pipe 1011. The clean water continuously washes away impurities and dirt on the surfaces of the photocatalytic membrane I 106 and the photocatalytic membrane II 107. The impurities washed off the photocatalytic membrane I 106 are discharged downward through the gap between the inner side of the photocatalytic membrane I 106 and the outer side of the annular groove 1032. The cleaned water flows out through the filter membrane 1017 and the solenoid valve 1016, thereby cleaning the photocatalytic membrane I 106 and the photocatalytic membrane II 107.

[0046] Furthermore, since cleaning cotton is provided on both the inner annular surface of photocatalytic membrane I 106 and the outer annular surface of photocatalytic membrane II 107, the electric push rod V 201 is then controlled to cause the connecting ring II 202 and connecting rod II 203 to move the photocatalytic membrane I 106 vertically back and forth. This allows the cleaning cotton on the inner annular surface of photocatalytic membrane I 106 to clean the dirt attached to the inner side of the annular cylinder 103. Then, the electric push rod I 108 is controlled to cause the connecting ring I 1012 and connecting rod I 1013 to move the photocatalytic membrane II 107 vertically back and forth. This allows the cleaning cotton on the outer annular surface of photocatalytic membrane II 107 to clean the dirt attached to the inner wall of the cylinder 2.

[0047] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A harmless purification device for fracturing flowback fluid in oil and gas fields, comprising a base (1) and a cylinder (2); the base (1) is fixedly connected to the cylinder (2); the cylinder (2) is provided with a water outlet (12); characterized in that, It also includes a fixed pipe (101), a filter screen (102), an annular cylinder (103), an electroluminescent body (104), photocatalytic membrane I (106), photocatalytic membrane II (107), an electric push rod I (108), a connecting ring I (1012), a connecting rod I (1013), an annular plate (1015), a solenoid valve (1016), and a primary purification assembly; the fixed pipe (101) is provided with an inlet (11); the cylinder (2) is fixedly connected to a fixed... Fixed pipe (101); the fixed pipe (101) is detachably connected to a filter screen (102); the fixed pipe (101) is fixedly connected to an annular cylinder (103), and the annular cylinder (103) is located inside the cylinder body (2), and the inner side of the annular cylinder (103) is opaque, while the outer side of the annular cylinder (103) is transparent; the annular cylinder (103) has an annular receiving cavity (1031); the cylinder body (2) is fixedly connected to several electroluminescent bodies (104), and the electroluminescent bodies ( 104) Located inside the receiving cavity (1031); several photocatalytic membranes I (106) are connected to the outer wall of the annular cylinder (103); several photocatalytic membranes II (107) are slidably connected to the inner wall of the cylinder (2), and the photocatalytic membranes II (107) and photocatalytic membranes I (106) are interleaved; an electric push rod I (108) is fixedly connected to the cylinder (2); a connecting ring I (1012) is fixedly connected to the telescopic end of the electric push rod I (108); the connecting ring I (1012) Several connecting rods I (1013) are fixedly connected, and the connecting rods I (1013) are fixedly connected to all photocatalytic membranes II (107); the cylinder (2) is connected to an annular plate (1015), and the annular plate (1015) is located below the lowest photocatalytic membrane II (107); several solenoid valves (1016) are fixedly connected to the annular plate (1015); the cylinder (2) is connected to a primary purification component for primary filtration of the return liquid.

2. The device for harmless purification of oil and gas field fracturing flowback fluid according to claim 1, characterized in that, The primary purification assembly includes a microbial membrane (105), a hollow tube (109), a one-way valve (1010), an electric push rod II (1018), a cover plate (1019), an electric push rod III (1020), and a push plate (1021); the cylinder (2) is fixedly connected to the electric push rod II (1018); the telescopic end of the electric push rod II (1018) is fixedly connected to the cover plate (1019); the cover plate (1019) is connected to several microbial membranes (105), and the microbial membranes (105) are located inside the annular cylinder (103); the cylinder (2) is fixedly connected to the hollow tube (109), and the hollow tube (109) is slidably connected to the cover plate (1019), and the hollow tube is... The tube (109) is inserted into the inside of the annular cylinder (103); the hollow tube (109) is fixedly connected to several one-way valves (1010), and the one-way valves (1010) only allow gas to flow from the inside of the hollow tube (109) to the outside; the cylinder (2) is fixedly connected to an electric push rod III (1020), and the telescopic end of the electric push rod III (1020) is slidably connected to the cover plate (1019); the telescopic end of the electric push rod III (1020) is fixedly connected to a push plate (1021), and the push plate (1021) is slidably connected to the annular cylinder (103), and the push plate (1021) has several round holes for the microbial membrane (105) and the hollow tube (109) to pass through.

3. The device for harmless purification of oil and gas field fracturing flowback fluid according to claim 1, characterized in that, The cross-sections of photocatalytic membrane I (106) and photocatalytic membrane II (107) are arranged at an angle with the inner side lower than the outer side.

4. The device for harmless purification of oil and gas field fracturing flowback fluid according to claim 1, characterized in that, A reflective layer is provided on the inner side of the cylinder (2).

5. The device for harmless purification of oil and gas field fracturing flowback fluid according to claim 1, characterized in that, The inner wall of the receiving cavity (1031) is set to a concave shape.

6. The harmless purification device for oil and gas field fracturing flowback fluid according to claim 1, characterized in that, It also includes a conveying pipe (1011); the cylinder (2) is connected to the conveying pipe (1011).

7. The device for harmless purification of oil and gas field fracturing flowback fluid according to claim 1, characterized in that, It also includes an electric push rod IV (1014) and a filter membrane (1017); the cylinder (2) is fixedly connected to several electric push rods IV (1014), and the telescopic ends of all electric push rods IV (1014) are fixedly connected to the annular plate (1015); the cylinder (2) is fixedly connected to the filter membrane (1017), and the filter membrane (1017) is located below the lowest photocatalytic membrane II (107), and the filter membrane (1017) is located above the annular plate (1015).

8. The harmless purification device for fracturing flowback fluid in oil and gas fields according to claim 2, characterized in that, It also includes a top cover (21) and lifting lugs (22); the top cover (21) is detachably connected to the upper end of the cylinder (2), and the top cover (21) is fixedly connected to the hollow tube (109), and an exhaust valve is provided on the top cover (21); several lifting lugs (22) are fixedly connected to the top cover (21).

9. The device for harmless purification of oil and gas field fracturing flowback fluid according to claim 7, characterized in that, It also includes an electric push rod V (201), a connecting ring II (202) and a connecting rod II (203); the cylinder (2) is fixedly connected to the electric push rod V (201); the telescopic end of the electric push rod V (201) is fixedly connected to the connecting ring II (202); the connecting ring II (202) is fixedly connected to several connecting rods II (203), and the connecting rods II (203) pass through the annular plate (1015) and the filter membrane (1017) and are fixedly connected to all the photocatalytic membranes I (106); the photocatalytic membranes I (106) are slidably connected to the outside of the annular cylinder (103); the annular cylinder (103) is provided with several annular grooves (1032).

10. A harmless purification device for oil and gas field fracturing flowback fluid according to claim 9, characterized in that, Cleaning cotton is provided on the inner annular surface of photocatalytic membrane I (106) and the outer annular surface of photocatalytic membrane II (107).

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