Oil field sewage treatment system for sewage discharge pool and use method of oil field sewage treatment system

Abstract

The invention discloses an oil field sewage treatment system with a sewage discharge pool, which comprises a separation device, a gas storage tank, an oil storage tank, a primary oil separation tank, an air compressor, a sludge pool, a sewage lifting pump, a backwashing pump, a filter material circulating pump, a feeding pool and a sewage discharge pool, the separation device comprises a tank body and a vortex generation device, and the vertical vortex generation device is fixed at the middle part in the tank body; the bottom of the tank body is fixedly communicated with a sludge discharge pipe extending to the outside, the vortex generating device comprises a vertical generating cylinder, and the middle of the generating cylinder is fixedly communicated with a water inlet guide pipe. According to the sewage treatment device, floating oil in sewage can be separated and discharged by utilizing the generating device, suspended particles in the sewage can be adsorbed through the suspended ball adsorption filler and can be gathered and increased in weight, and then the suspended particles fall off and sink under the mutual collision of the suspended ball adsorption filler and are discharged through the sludge discharging pipe; flocs in the sewage can be deposited at the top end of the obliquely arranged corrugated plate and sink to be discharged through the sludge discharge pipe when reaching a certain weight, and the residual water is discharged through the water outlet guide pipe, so that the separation of oil, sludge and water is realized in the tank body, and the separation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield water treatment, and in particular to a sewage treatment system for oilfield sewage in a sewage drainage tank and a use method thereof. Background Art

[0002] As the development time of oil fields increases, more and more dirt accumulates in the oil and water treatment process in the station, which not only seriously affects the treatment quality of oil and water, but also brings hidden dangers to the safe production of oil fields. The existing oilfield sewage has many problems in the treatment process, such as cumbersome process, long treatment time, poor treatment effect, and large amount of sludge. In order to solve such problems, most oil fields will send the oil sludge at the bottom of the tank and the bottom of the pool to the profile adjustment and oil tank water cut-back water treatment system. However, due to the overload of sludge generation, the profile adjustment can no longer meet the needs, and the sewage return treatment system has a greater impact on the produced water treatment system, affecting the subsequent water treatment quality, thus causing a vicious cycle. For this reason, it has been listed as a problem to be solved urgently by the oilfield system.

[0003] In order to relieve the pressure of sludge profile control and produced water treatment system and reduce the amount of sludge, it is necessary to carry out targeted treatment of oilfield wastewater in the sewage pool so as to efficiently separate the oil, mud and water in the high-oil-content wastewater in the sewage pool. Summary of the invention

[0004] The object of the present invention is to provide a sewage treatment system for oilfield wastewater and a method of using the system to solve the technical problem of low separation efficiency of oil, mud and water in high-oil-content sewage in existing sewage treatment systems.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A sewage treatment system for oilfield wastewater in a sewage pool includes a separation device, the separation device includes a tank body and a vortex generating device, a vertical vortex generating device is fixed in the middle of the tank body, a mud discharge pipe extending to the outside is fixedly connected to the bottom of the tank body, the vortex generating device includes a vertical generating tube, a water inlet conduit is fixedly connected to the middle of the generating tube, and a sewage discharge pipe is closed and fixedly connected to the bottom, the upper part of the generating tube penetrates upward, and a vertical sedimentation tube is fixed to the upper part of the outer wall, an annular No. 1 sieve plate is sealed and fixed to the upper part of the outer wall of the generating tube and the inner wall of the tank body, the upper part of the sedimentation tube is sealed to the outer wall of the generating tube, and the bottom Penetrating downward, the upper part of the sedimentation cylinder is fixed with a water outlet conduit, and the bottom of the outer wall and the inner wall of the tank body are jointly sealed with an annular No. 2 sieve plate, the water inlet conduit, the sewage pipe and the water outlet conduit extend outside the tank body, the inner cavity of the tank body and the No. 1 sieve plate, the No. 2 sieve plate and the outer wall of the sedimentation cylinder together constitute a particle adsorption chamber, the particle adsorption chamber is non-full filled with suspended ball adsorption fillers that cannot pass through the No. 1 sieve plate and the No. 2 sieve plate, the chamber formed by the sedimentation cylinder and the generating cylinder is installed with corrugated plates inclined up and down, the top of the tank body is fixedly connected with an upper cylinder, the outer wall of the upper cylinder is fixedly connected with an oil collecting pipe, and the top is sealed.

[0006] On the basis of the above technical solution, the bottom of the tank body is fixedly connected with a side manhole, and the penetration points between the upper manhole and the side manhole and the outside are sealed with a cylinder cover through a fastener.

[0007] On the basis of the above technical scheme, a plurality of through-going air inflation pipes are fixed at the bottom of the tank body, the bottom of the air inflation pipes extends out of the tank body, and the upper part extends vertically into the tank body, the vertical part of the upper part of the air inflation pipes is horizontally penetrated by a plurality of air inflation holes, and plungers are respectively sealed and slidably connected up and down, the plungers can seal the air inflation holes, and a storage hopper is fixed to the top of each plunger, two opposite edges of the storage hopper are in fit and contact with the inner wall of the tank body and the outer wall of the sedimentation cylinder, and the other two opposite edges are in the shape of vertical leak plates and are in fit and contact with adjacent storage hoppers, the middle part of the storage hopper is in the shape of a horizontal leak plate, and the suspended ball adsorption filler cannot pass through the storage hopper.

[0008] Based on the above technical solution, the middle part of the generating tube is in the shape of a vertical cylinder, and the water inlet conduit is eccentrically arranged compared to the generating tube.

[0009] On the basis of the above technical scheme, the middle part of the generating tube is vertically cylindrical, and the vortex generating device also includes a turbine, which is at the same height as the water inlet duct. Two upper and lower corresponding limit rings are coaxially fixed to the middle part of the inner wall of the generating tube, and the two limit rings are arranged on the upper and lower sides of the water inlet duct. The middle part of the generating tube is coaxially connected with a turbine, and the turbine includes a vertical supporting tube, and a plurality of vortex plates inclined to the axis of the supporting tube are fixed at equal angles on the outer wall of the supporting tube, and each of the vortex plates is respectively located between the two limit rings, and the inclined side surface of the vortex plate adjacent to the water inlet duct is arranged in a direction away from downward.

[0010] On the basis of the above technical scheme, a plurality of horizontal and waterproof servo motors are fixed to the inner wall of the sedimentation cylinder, and the servo motor has a braking function. A flower axis is coaxially fixed to the rotating shaft of the servo motor, and the flower axis is axially slidingly connected to a guide cylinder, and the guide cylinder is radially fixed with corrugated plates parallel to each other. The servo motor is electrically connected to an external circuit control system, and when the servo motor rotates, it can drive the flower axis and the guide cylinder to rotate through the flower axis, thereby changing the inclination angle of the corrugated plate.

[0011] Based on the above technical solution, a plurality of inner electromagnets are fixed to the outer wall of the sedimentation cylinder, and an outer electromagnet is fixed to the end of each guide cylinder close to the outer wall of the sedimentation cylinder, each inner electromagnet and each outer electromagnet are adjacent to and correspond to each other, and the inner electromagnet and the outer electromagnet are electrically connected to an external circuit control system.

[0012] On the basis of the above technical scheme, the sewage treatment system for oilfield wastewater in the sewage discharge pool also includes a polarization filtration and water purification device, which includes a sub-tank body, the top center of the sub-tank body is fixedly connected with an upper dual-purpose pipe, and the top is fixedly connected with a sub-upper manhole, the sub-upper manhole is fixedly connected with a sub-oil collecting pipe, the middle part of the sub-tank body is fixedly connected with a middle manhole, the penetration points of the sub-upper manhole and the middle manhole with the outside world are sealed with a sub-tank cover through fasteners, the upper part of the sub-tank body is fixedly connected with a feed pipe, and the lower and middle parts are fixedly connected with a discharge pipe, the bottom of the sub-tank body is provided with a lower dual-purpose pipe, and the upper part of the sub-tank body is sealed A No. 3 sieve plate is fixed, and a No. 4 sieve plate is fixed in a sealed inner lower part. The No. 3 sieve plate, the No. 4 sieve plate and the inner cavity of the sub-tank body are filled with filter materials without being filled. A centripetal air flotation device is fixed at the upper center of the sub-tank body. The centripetal air flotation device is located above the No. 3 sieve plate and is connected to the upper dual-purpose pipe. A group of electric cation-eliminating water processors are respectively fixed at the upper and lower parts of the sub-tank body. The electric cation-eliminating water processor in the upper part of the sub-tank body is located in the open space between the No. 3 sieve plate and the filler, and the electric cation-eliminating water processor in the lower part of the sub-tank body is located below the No. 4 filter plate. The electric cation-eliminating water processor is connected to an external power supply.

[0013] On the basis of the above technical scheme, the sewage treatment system of the sewage tank also includes an air storage tank, an oil storage tank, a primary oil separator, an air compressor, a sludge tank, a sewage lifting pump, a backwash pump, a filter material circulation pump, a feeding tank and a sewage tank, the water inlet conduit is connected to the water outlet pipe of the sewage lifting pump, the water inlet pipe of the sewage lifting pump is connected to the water outlet pipe of the sewage tank, the upper dual-purpose pipe is connected to the water outlet conduit, the lower dual-purpose pipe is connected to the water inlet pipe of the primary oil separator, and the mud inlet pipe of the sludge tank is connected to the mud discharge pipe and the sewage discharge pipe; The liquid inlet pipe of the oil storage tank is respectively connected with the oil receiving pipe and the sub-oil receiving pipe; The air outlet of the air compressor is respectively connected to the air inlet of the air storage tank, and the air outlet of the air storage tank is respectively connected to the water inlet conduit, the air blowing pipe, the upper dual-purpose pipe and the lower dual-purpose pipe; The outlet of the primary oil separator is connected to the inlet of the backwash pump, and the outlet of the backwash pump is connected to the lower dual-purpose pipe; The feeding tank comprises a tank body, a feeding chamber, a washing chamber, a feeding pipe, a discharge pipe, a stop valve, a left washing bucket, a right washing bucket, a left support plate, a right support plate, a leakage hole, a partition, a water hole, a main guide, a sub-guide, and an electric push rod. The tank body is provided with a feeding chamber and a washing chamber separated from each other from left to right in sequence. A feeding pipe is fixed above the washing chamber, and a discharge pipe is fixedly connected to the bottom of the feeding chamber and the washing chamber respectively. A stop valve is installed on the discharge pipe and the feeding pipe respectively. The bottoms of the two discharge pipes are connected to the feed port of the filter material circulation pump after being gathered together. The left part of the washing chamber is slidably connected to the left washing bucket, and the right part is slidably connected to the right washing bucket in a front-to-back manner. A plurality of horizontal left support plates are fixed to the right part of the left washing bucket from top to bottom. A plurality of horizontal right support plates are fixed in sequence from top to bottom, the top end of the left support plate is fitted with the bottom end of the right support plate, and a horizontal electric push rod is fixed to the front and rear parts of the pool body in the front and rear directions, and the electric push rod is electrically connected to the external circuit control system, and the push rods of the two electric push rods are respectively fixed to the left scrubbing bucket and the right scrubbing bucket, and the left support plate and the right support plate are respectively penetrated with a plurality of leakage holes up and down, and each of the leakage holes can be aligned with each other in the up and down directions, and a plurality of vertical partitions are respectively fixed to the right front and right rear parts of the left scrubbing bucket, and a plurality of water holes are penetrated in the front and rear directions of the partitions, and the inner diameter of the leakage hole is larger than the inner diameter of the water hole, and the filter material can pass through the leakage hole but cannot pass through the water hole, and the left scrubbing bucket and the right scrubbing bucket are respectively fixed with a plurality of sets of main guide members; A group of the main guide members includes two groups of sub-guide members that are mirror images of each other, each group of sub-guide members includes a support shaft, a guide plate and two limit rods, the support shaft is fixed on the side walls of the left and right washing buckets in a horizontal direction, the two limit rods in the sub-guide members are fixed on the left and right sides of the support shaft in a horizontal direction, the upper and lower spacing between the limit rods in the two sub-guide members in the main guide member is smaller than the upper and lower spacing between the support shafts in the two sub-guide members, each of the support shafts is hinged with a guide plate, and each of the guide plates can swing back and forth and contact the limit rods; The discharge pipe is connected to the feeding pipe, and the discharge port of the filter material circulation pump is connected to the feeding pipe.

[0014] Based on the above technical solution, a method for using the sewage treatment system of a sewage pool oilfield is provided, and the method comprises the following steps: Step 101, sewage from the sewage tank is transported to the water inlet conduit through the sewage lifting pump, and dissolved in the water inlet conduit under the action of the air compressor and the air storage tank, and finally enters the vortex generating device, the floating oil and the dispersed oil gather inwardly in the generating tube and float up with the bubbles, and finally are discharged from the oil collecting pipe, the particles with larger mass in the generating tube sink, and finally are discharged from the sewage pipe, the separated water moves downward in the upper space of the tank body, and enters the particle adsorption chamber, the suspended ball adsorption filler in the particle adsorption chamber adsorbs the suspended particles, so that the volume of the suspended particles increases and the weight increases, and the water flow can cause them to collide with each other when flushing the suspended ball adsorption filler, so that the suspended particles with increased weight are shaken off and enter the sedimentation tube through the sieve holes of the second sieve plate, and the sewage enters the sedimentation tube and flows upward and passes through the inclined corrugated plate, and the flocs are deposited on the corrugated plate by utilizing the difference between the water flow direction and the sludge settling direction, and when the sedimentation reaches a certain degree, it slides down to the bottom of the tank body to settle and is discharged from the sludge discharge pipe, and the water at the top of the sedimentation tube is finally discharged from the water outlet conduit; Step 102, the water discharged from the water outlet conduit is dissolved with air under the action of the air storage tank and the air compressor, and then enters the centripetal flotation device through the upper dual-purpose pipe to generate turbulent rotation. Under the action of centrifugal force, the oil and gas migrate to the inner circle, and the solid particles and water migrate to the outer circle. Under the dual action of centrifugal force and air flotation, the oil is separated and flotated, and then discharged from the sub-oil collecting pipe to the oil storage tank, and the water and solid particles are filtered through the No. 3 sieve plate, and the coarse particles are filtered and intercepted. The water filtered by the No. 3 sieve plate is stabilized by the electric decationizing water processor, and then enters the filter material for fine filtration and intercepts fine particles. The finely filtered water is filtered by the No. 4 sieve plate, and then polarized by the electric decationizing water processor again, and then discharged from the lower dual-purpose pipe after polarization treatment; Step 103, using the gas storage tank to add gas to each air blast pipe alternately at regular intervals, so that the plunger can be intermittently lifted up by the air pressure, and the air blast hole can be intermittently discharged with bubbles, and the storage hopper follows the plunger to move up and down alternately, so that the suspended ball adsorption filler at different positions can be alternately pushed to achieve scrubbing and collision; Step 104, using an air compressor and an air storage tank to blow air into the lower dual-purpose pipe to loosen the filter material, and then using a filter material circulation pump to transport the filter material between the third sieve plate and the fourth sieve plate to achieve scrubbing to make the filter retaining fall off, and during this period, the filter material is added using a feeding tank as needed; Step 105: The water treated by the polarization filtration water purification device enters the primary oil separator through the lower dual-purpose pipe, and the materials in the sewage pipe and the sludge pipe flow to the sludge pool; Step 106, backwash the sub-tank body as needed. During backwashing, the backwash water flows into the sub-tank body through the backwash pump and the lower dual-purpose pipe, and is finally discharged into the oil storage tank through the upper dual-purpose pipe. During this period, the filter material is scrubbed and the filter retaining material that falls off and the filter retaining material on the top of the No. 3 sieve plate will be collected in the oil storage tank together.

[0015] Compared with the prior art, the present invention has the following advantages: by setting a separation device, the present invention can utilize a generating device to aggregate, separate and discharge floating oil and dispersed oil in sewage, and by using a suspended ball adsorption filler, the suspended particles in sewage can be adsorbed and aggregated to increase their weight, and then fall off and sink due to the mutual collision of the suspended ball adsorption filler, and be discharged through a mud discharge pipe, while flocs in sewage can be deposited on the top of an inclined corrugated plate, and when reaching a certain weight, they sink and are discharged through a mud discharge pipe, and the remaining water is discharged through a water outlet conduit, thereby realizing the separation of oil, mud and water in the tank body and improving the separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial flow diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the axial structure of the separation device of the present invention.

[0018] Figure 3 It is a schematic diagram of the front cross-section structure of the separation device of the present invention.

[0019] Figure 4 It is a schematic diagram of the partially enlarged structure of location A of the present invention.

[0020] Figure 5 It is a schematic diagram of the top cross-section structure of the separation device of the present invention.

[0021] Figure 6 It is a schematic diagram of the axial structure of the polarization filtration water purification device of the present invention.

[0022] Figure 7It is a schematic diagram of the front cross-section structure of the polarization filtration water purification device of the present invention.

[0023] Figure 8 It is a schematic diagram of the axial structure of the feeding tank of the present invention.

[0024] Fig. 9 It is a schematic diagram of the main structure of the feeding tank of the present invention.

[0025] Fig.10 It is a schematic diagram of the coordination of the left scrubbing and washing bucket and the right scrubbing and washing bucket of the present invention.

[0026] In the figure: 1, separation device, 2, tank body, 3, generating device, 4, mud discharge pipe, 5, generating cylinder, 6, water inlet pipe, 7, sewage pipe, 8, sedimentation cylinder, 9, No. 1 sieve plate, 10, water outlet pipe, 11, No. 2 sieve plate, 12, particle adsorption chamber, 13, suspended ball adsorption filler, 14, corrugated plate, 15, upper cylinder, 16, oil collection pipe, 17, side cylinder, 18, cylinder cover, 19, air blow pipe, 20 , air hole, 21, plunger, 22, storage hopper, 23, turbine, 24, limit ring, 25, support cylinder, 26, vortex plate, 27, servo motor, 28, flower axis, 29, guide cylinder, 31, inner electromagnet, 32, outer electromagnet, 33, polarization filtration water purification device, 34, sub tank body, 35, upper dual-purpose tube, 36, sub upper cylinder, 37, sub oil collection pipe, 38, middle cylinder, 39, sub cylinder cover, 4 0. Feed pipe, 41. Discharge pipe, 42. Lower dual-purpose pipe, 43. No. 3 sieve plate, 44. No. 4 sieve plate, 45. Filter material, 46. Centripetal air flotation device, 47. Electric cation elimination water treatment device, 48. Gas storage tank, 49. Oil storage tank, 50. Primary oil separator, 51. Air compressor, 52. Sludge tank, 53. Sewage lifting pump, 54. Backwash pump, 55. Filter material circulation pump, 56. Feeding tank, 57. Drain Sewage tank, 58, tank body, 59, feeding chamber, 60, washing chamber, 61, feeding pipe, 62, discharge pipe, 63, stop valve, 64, left washing bucket, 65, right washing bucket, 66, left support plate, 67, right support plate, 68, leakage hole, 69, partition, 70, water hole, 71, main guide member, 72, sub-guide member, 73, support shaft, 74, limit rod, 75, guide plate, 76, electric push rod. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-Figure 10As shown, a sewage treatment system for oilfield wastewater in a sewage pool includes a separation device 1, and the separation device 1 includes a tank body 2 and a vortex generating device 3. A vertical vortex generating device 3 is fixed in the middle of the tank body 2, and a mud discharge pipe 4 extending to the outside is fixedly connected to the bottom of the tank body 2. The vortex generating device 3 includes a vertical generating tube 5, a water inlet conduit 6 is fixedly connected to the middle of the generating tube 5, and a sewage discharge pipe 7 is closed and fixedly connected to the bottom. The upper part of the generating tube 5 penetrates upward, and a vertical sedimentation tube 8 is fixed to the upper part of the outer wall. The upper part of the outer wall of the generating tube 5 and the inner wall of the tank body 2 are jointly sealed and fixed with an annular No. 1 sieve plate 9. The upper part of the sedimentation tube 8 is sealed with the outer wall of the generating tube 5, and the bottom penetrates downward. A water outlet conduit 10 is fixed to the upper part of the sedimentation cylinder 8, and a ring-shaped No. 2 sieve plate 11 is fixed to the bottom of the outer wall and the inner wall of the tank body 2. The water inlet conduit 6, the sewage pipe 7, and the water outlet conduit 10 extend to the outside of the tank body 2. The inner cavity of the tank body 2, the No. 1 sieve plate 9, the No. 2 sieve plate 11 and the outer wall of the sedimentation cylinder 8 together constitute a particle adsorption chamber 12. The particle adsorption chamber 12 is partially filled with suspended ball adsorption fillers 13 that cannot pass through the No. 1 sieve plate 9 and the No. 2 sieve plate 11. A corrugated plate 14 inclined up and down is installed in the chamber formed by the sedimentation cylinder 8 and the generating cylinder 5. The top of the tank body 2 is fixedly connected to a manhole 15, and the outer wall of the manhole 15 is fixedly connected to an oil collection pipe 16, and the top is sealed.

[0029] The bottom of the tank body 2 is fixedly connected with a side manhole 17, and the penetration points between the upper manhole 15 and the side manhole 17 and the outside are sealed with a cylinder cover 18 through fasteners.

[0030] A plurality of through-going air inflation pipes 19 are fixed to the bottom of the tank body 2, the bottom of the air inflation pipes 19 extends outside the tank body 2, and the upper part extends vertically into the tank body 2, the vertical part of the upper part of the air inflation pipes 19 is horizontally penetrated by a plurality of air inflation holes 20, and plungers 21 are respectively sealed and slidably connected up and down, the plungers 21 can seal and block the air inflation holes 20, and a storage hopper 22 is respectively fixed to the top of each plunger 21, the two opposite edges of the storage hopper 22 are in contact with the inner wall of the tank body 2 and the outer wall of the sedimentation cylinder 8, and the other two opposite edges are in the shape of vertical leak plates and are in contact with the adjacent storage hoppers 22, the middle part of the storage hopper 22 is in the shape of a horizontal leak plate, and the suspended ball adsorption filler 13 cannot pass through the storage hopper 22.

[0031] By adding air to each air blowing pipe 19 at regular intervals, the plunger 21 can be intermittently lifted up under the action of air pressure, and the air blowing hole 20 can intermittently discharge bubbles. The storage hopper 22 follows the plunger 21 to move up and down alternately, and can push the suspended ball adsorption filler 13 at different positions alternately to achieve scrubbing and collision, thereby disturbing the suspended ball adsorption filler 13 and preventing the suspended ball adsorption filler 13 from storing mud for a long time and causing compaction. The detached adsorbent passes through the storage hopper 22 and the No. 2 screen plate 11 and falls down.

[0032] The middle part of the generating tube 5 is in a vertical cylindrical shape, and the water inlet conduit 6 is eccentrically arranged compared to the generating tube 5 .

[0033] The eccentrically arranged water inlet conduit 6 enables a vortex to be formed in the generating tube 5 after water enters the water inlet conduit 6 .

[0034] The middle part of the generating tube 5 is in the shape of a vertical cylinder. The vortex generating device 3 also includes a turbine 23. The turbine 23 is at the same height as the water inlet duct 6. Two upper and lower corresponding limit rings 24 are coaxially fixed to the middle part of the inner wall of the generating tube 5. The two limit rings 24 are arranged on the upper and lower sides of the water inlet duct 6. The turbine 23 is coaxially connected to the middle part of the generating tube 5. The turbine 23 includes a vertical supporting tube 25. A plurality of vortex plates 26 inclined to the axis of the supporting tube 25 are fixed at equal angles on the outer wall of the supporting tube 25. Each of the vortex plates 26 is respectively located between the two limit rings 24. The inclined side surfaces of the vortex plates 26 adjacent to the water inlet duct 6 are arranged in a direction away from downward.

[0035] Furthermore, by providing the turbine 23 , not only can the water from the water inlet conduit 6 be used to flush the vortex plate 26 to rotate the turbine 23 and form a vortex, but the water can also flow downwardly when flushing the vortex plate 26 , so that large particles can be quickly settled and discharged from the sewage pipe 7 .

[0036] A plurality of horizontal and waterproof servo motors 27 are fixed to the inner wall of the sedimentation cylinder 8. The servo motor 27 has a braking function. A flower axis 28 is coaxially fixed to the rotating shaft of the servo motor 27. The flower axis 28 is axially slidably connected to a guide cylinder 29. The guide cylinder 29 is radially fixed with parallel corrugated plates 14. The servo motor 27 is electrically connected to an external circuit control system. When the servo motor 27 rotates, the flower axis 28 can drive the flower axis 28 and the guide cylinder 29 to rotate, thereby changing the inclination angle of the corrugated plate 14.

[0037] Furthermore, by controlling the servo motor 27 to rotate, the inclination angle of the corrugated plate 14 can be changed to adapt to the different flow rates of the upward sewage in the sedimentation cylinder 8, and the side that contacts the upward sewage for the first time can be changed. By intermittently and alternately changing the side that contacts the first time, the flocs deposited on the upper side can be quickly detached and settled, and the side where the flocs are not settled can receive the settlement, thereby improving the efficiency of the floc shedding and settlement.

[0038] A plurality of inner electromagnets 31 are fixed to the outer wall of the sedimentation cylinder 8, and an outer electromagnet 32 ​​is fixed to the end of each guide cylinder 29 close to the outer wall of the sedimentation cylinder 8, and each inner electromagnet 31 and each outer electromagnet 32 ​​are adjacent to each other and correspond to each other, and the inner electromagnet 31 and the outer electromagnet 32 ​​are electrically connected to an external circuit control system.

[0039] Furthermore, by intermittently changing the current direction of the inner electromagnet 31 and the outer electromagnet 32, the two are sometimes magnetically attracted to each other and sometimes magnetically repelled from each other, so that the guide cylinder 29 moves back and forth along the flower axis 28, and then the floc deposits on the upper side of the corrugated plate 14 can be shaken to facilitate falling off.

[0040] The sewage treatment system for oilfield wastewater in the sewage tank also includes a polarization filtration water purification device 33, which includes a sub-tank body 34, the top center of the sub-tank body 34 is fixedly connected with an upper dual-purpose pipe 35, and the top is fixedly connected with a sub-upper manhole 36, the sub-upper manhole 36 is fixedly connected with a sub-oil collecting pipe 37, and the middle part of the sub-tank body 34 is fixedly connected with a middle manhole 38, and the penetration points of the sub-upper manhole 36 and the middle manhole 38 with the outside are sealed by fasteners. There is a sub-tube cover 39, the upper part of the sub-tank body 34 is fixedly connected with a feed pipe 40, and the middle and lower part is fixedly connected with a discharge pipe 41, the bottom of the sub-tank body 34 is provided with a lower dual-purpose pipe 42, the upper part of the sub-tank body 34 is sealed and fixed with a No. 3 sieve plate 43, and the lower part is sealed and fixed with a No. 4 sieve plate 44, the No. 3 sieve plate 43, the No. 4 sieve plate 44 and the inner cavity of the sub-tank body 34 are not filled with filter material 45, and the upper center of the sub-tank body 34 is fixed with a centripetal air flotation device 4 6. The centripetal air flotation device 46 is a device that can generate vortex rotation after the fluid is introduced. It is a prior art and adopts the same technology as the vortex centripetal air flotation component in the multifunctional integrated adhesive wastewater fine treatment device of the Chinese invention patent with patent number CN104098217A. The centripetal air flotation device 46 is located above the third sieve plate 43 and is connected to the upper dual-purpose pipe 35. A group of electric cation elimination water processors 47 are fixed in the upper and lower parts of the sub-tank body 34. The electric cation elimination water processor 47 is a prior art and adopts the technology of an electric cation elimination water processor 47 of the Chinese utility model patent with patent number CN209507685U. The electric cation elimination water processor 47 in the upper part of the sub-tank body 34 is located in the open space between the third sieve plate 43 and the filler, and the electric cation elimination water processor 47 in the lower part of the sub-tank body 34 is located below the fourth filter plate. The electric cation elimination water processor 47 is connected to an external power supply.

[0041] The electric decationizing water processor 47 is used to perform polarization treatment to reduce the cation and dissolved oxygen content in the water and reduce harmful bacteria in the water.

[0042] The sewage treatment system for oilfield wastewater in the sewage tank also includes an air storage tank 48, an oil storage tank 49, a primary oil separator 50, an air compressor 51, a sludge tank 52, a sewage lifting pump 53, a backwash pump 54, a filter circulation pump 55, a feeding tank 56 and a sewage tank 57. The water inlet conduit 6 is connected to the water outlet pipe of the sewage lifting pump 53, the water inlet pipe of the sewage lifting pump 53 is connected to the water outlet pipe of the sewage tank 57, the upper dual-purpose pipe 35 is connected to the water outlet conduit 10, the lower dual-purpose pipe 42 is connected to the water inlet pipe of the primary oil separator 50, and the mud inlet pipe of the sludge tank 52 is connected to the mud discharge pipe 4 and the sewage discharge pipe 7; The liquid inlet pipe of the oil storage tank 49 is connected to the oil receiving pipe 16 and the sub-oil receiving pipe 37 respectively; The air outlet of the air compressor 51 is respectively connected to the air inlet of the air storage tank 48, and the air outlet of the air storage tank 48 is respectively connected to the water inlet conduit 6, the air blower pipe 19, the upper dual-purpose pipe 35 and the lower dual-purpose pipe 42; The outlet of the primary oil separator 50 is connected to the inlet of the backwash pump 54, and the outlet of the backwash pump 54 is connected to the lower dual-purpose pipe 42; The feeding tank 56 includes a tank body 58, a feeding chamber 59, a washing chamber 60, a feeding pipe 61, a discharge pipe 62, a stop valve 63, a left washing bucket 64, a right washing bucket 65, a left support plate 66, a right support plate 67, a leak hole 68, a partition plate 69, a water hole 70, a main guide member 71, a sub-guide member 72, and an electric push rod 76. The tank body 58 is sequentially provided with a feeding chamber 59 and a washing chamber 60 separated from each other from left to right, and a feeding pipe 61 is fixed above the washing chamber 60. 1. The bottoms of the feeding chamber 59 and the washing chamber 60 are respectively connected with a discharge pipe 62, and the discharge pipe 62 and the feeding pipe 61 are respectively installed with a stop valve 63. The bottoms of the two discharge pipes 62 are connected to the feed port of the filter material circulation pump 55 after being combined. The left part of the washing chamber 60 is connected to a left scrubbing bucket 64 for sliding forward and backward, and the right part is connected to a right scrubbing bucket 65 for sliding forward and backward. The right part of the left scrubbing bucket 64 is fixed with a plurality of horizontal left support plates 66 in sequence from top to bottom. A plurality of horizontal right support plates 67 are fixed in sequence from top to bottom on the left part of the right scrubbing bucket 65, and the top of the left support plate 66 is fitted with the bottom of the right support plate 67. A horizontal electric push rod 76 is fixed to the front and rear parts of the pool body 58 in the front and rear directions, and the electric push rod 76 is electrically connected to the external circuit control system. The push rods of the two electric push rods 76 are respectively fixed to the left scrubbing bucket 64 and the right scrubbing bucket 65. The left support plate 66 and the right support plate 67 are respectively penetrated with a plurality of leakage holes 68, and each of the leakage holes 68 can be aligned with each other in the upper and lower directions. A plurality of vertical partitions 69 are respectively fixed to the right front and right rear parts of the left scrubbing bucket 64, and a plurality of water holes 70 are penetrated in the front and rear directions of the partitions 69. The inner diameter of the leakage hole 68 is larger than the inner diameter of the water hole 70, and the filter material 45 can pass through the leakage hole 68 but cannot pass through the water hole 70. The left scrubbing bucket 64 and the right scrubbing bucket 65 are respectively fixed with a plurality of sets of main guide members 71; A group of the main guide members 71 includes two groups of sub-guide members 72 which are mirror images of each other. Each group of sub-guide members 72 includes a support shaft 73, a guide plate 75 and two limit rods 74. The support shaft 73 is fixed on the side walls of the adjacent pairs of the left scrubbing bucket 64 and the right scrubbing bucket 65 in the horizontal direction. The two limit rods 74 in the sub-guide members 72 are fixed on the left and right sides of the support shaft 73 in the horizontal direction. The upper and lower spacing between the limit rods 74 in the two sub-guide members 72 in the main guide member 71 is smaller than the upper and lower spacing between the support shafts 73 in the two sub-guide members 72. Each of the support shafts 73 is hinged with a guide plate 75, and each of the guide plates 75 can swing back and forth and conflict with the limit rods 74. The discharge pipe 41 is connected to the feeding pipe 61 , and the discharge port of the filter material circulation pump 55 is connected to the feeding pipe 40 .

[0043] The filter material 45 and water to be replenished are added to the feeding chamber 59, and water is added to the washing chamber 60. When the filter material 45 in the sub-tank body 34 needs to be replenished, the stop valve 63 below the feeding chamber 39 is opened and the filter material circulation pump 55 is started to replenish the filter material 45 into the sub-tank body 34; when the filter material in the sub-tank body 34 needs to be scrubbed, the stop valve 63 below the feeding chamber 39 is closed, the stop valve 63 below the washing chamber 60 and the stop valve of the feeding pipe 61 are opened, and then the filter material circulation pump 55 is started, and the two electric push rods 76 are controlled to extend and retract at the same time. At this time, the filter material and sewage in the sub-tank body 34 enter the washing chamber 59 through the feeding pipe 61. At this time, the filter material 45 that moves back and forth is sucked into the washing chamber 59. The left scrubbing bucket 64 and the right scrubbing bucket 65 move in opposite directions, which can make the leakage hole 68 intermittently aligned up and down, so as to scrub the filter material 45 and make the filter material 45 intermittently discharged from the leakage hole 68 until it is discharged from the discharge pipe 62. During the scrubbing process, the guide plate 75 moves with the left scrubbing bucket 64 and the right scrubbing bucket 65, and collides with the limit rod 74 under the obstruction of sewage and filter material 45, thereby presenting different inclination angles, and then converges and flows under the guidance of the two guide plates 75 in the main guide member 71. Since the moving directions of the left scrubbing bucket 64 and the right scrubbing bucket 65 are opposite, the moving directions of the filter material 45 in the left and right parts of the washing chamber 60 can be opposite, thereby improving the scrubbing efficiency.

[0044] A method for using a sewage treatment system for an oilfield, the method comprising the following steps: Step 101, sewage from the sewage tank 57 is transported to the water inlet conduit 6 via the sewage lifting pump 53, and dissolved in the water inlet conduit 6 under the action of the air compressor 51 and the air storage tank 48, and finally enters the vortex generating device 3, the floating oil and the dispersed oil gather inwardly in the generating tube 5 and float up with the bubbles, and finally are discharged from the oil collecting pipe 16, the particles with larger mass in the generating tube 5 sink, and finally are discharged from the sewage pipe 7, and the separated water moves downward in the upper space of the tank body 2, and enters the particle adsorption chamber 12, and the suspended ball adsorption filler 13 in the particle adsorption chamber 12 adsorbs the suspended particles , making the volume of suspended particles larger and increasing their weight, and the water flow can make them collide with each other when flushing the suspended ball adsorption filler 13, so that the suspended particles with increased weight are shaken off and enter the sedimentation tube 8 through the sieve holes of the second sieve plate 11. After entering the sedimentation tube 8, the sewage flows upward and passes through the inclined corrugated plate 14. Taking advantage of the difference between the water flow direction and the sludge settling direction, the flocs are deposited on the corrugated plate 14. When they are deposited to a certain extent, they slide down to the bottom of the tank body 2 to settle and are discharged from the sludge discharge pipe 4. The water at the top of the sedimentation tube 8 is finally discharged from the water outlet pipe 10; Step 102, the water discharged from the water outlet conduit 10 is dissolved with air under the action of the air storage tank 48 and the air compressor 51, and then enters the centripetal flotation device 46 through the upper dual-purpose pipe 35 to generate turbulent rotation. Under the action of centrifugal force, the oil and gas migrate to the inner circle, and the solid particles and water migrate to the outer circle. Under the dual action of centrifugal force and air flotation, the oil is separated and flotated, and then discharged from the sub-oil collecting pipe 37 to the oil storage tank 48, and the water and solid particles are filtered through the third sieve plate 43, and the coarse particles are filtered and intercepted. The water filtered by the third sieve plate 43 is stabilized by the electric decationizing water processor 47, and then enters the filter material 45 for fine filtration and intercepts fine particles. The finely filtered water is filtered by the fourth sieve plate 44, and then polarized by the electric decationizing water processor 47 again, and then discharged from the lower dual-purpose pipe 42 after polarization treatment; Step 103, using the gas storage tank 48 to add gas to each air blowing pipe 19 at regular intervals, so that the plunger 21 can be intermittently lifted up by the air pressure, and the air blowing hole 20 can intermittently discharge bubbles, and the storage hopper 22 follows the plunger 21 to move up and down alternately, so that the suspended ball adsorption filler 13 at different positions can be alternately pushed to achieve scrubbing and collision; Step 104, using the air compressor 51 and the air storage tank 48 to blow air into the lower dual-purpose pipe 42 to loosen the filter material 45, and then using the filter material circulation pump 55 to transport the filter material 45 between the third sieve plate 43 and the fourth sieve plate 44 to achieve scrubbing to make the filter retained fall off, and during this period, the filter material 45 is added using the feeding tank 56 as needed; Step 105, the water treated by the polarization filtration water purification device 33 enters the primary oil separator 50 through the lower dual-purpose pipe 42, and the materials in the sewage pipe 7 and the sludge pipe 4 flow to the sludge pool 52; Step 106, backwash the sub-tank 34 as needed. During backwashing, the backwash water flows into the sub-tank 34 through the backwash pump 54 and the lower dual-purpose pipe 42, and is finally discharged into the oil storage tank 49 through the upper dual-purpose pipe 35. During this period, the filter material 45 is scrubbed and the filter retaining material that falls off and the filter retaining material on the top of the No. 3 sieve plate 43 will be collected in the oil storage tank 49 together.

[0045] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A sewage treatment system for oilfield wastewater in a sewage tank, comprising a separation device (1), the separation device (1) comprising a tank body (2) and a vortex generating device (3), a vertical vortex generating device (3) being fixed in the middle of the tank body (2), and a mud discharge pipe (4) extending to the outside being fixedly connected at the bottom of the tank body (2), characterized in that: The vortex generating device (3) comprises a vertical generating tube (5), the middle of the generating tube (5) is fixedly connected to a water inlet conduit (6), and the bottom is sealed and fixedly connected to a sewage discharge pipe (7), the upper part of the generating tube (5) is penetrated upward, and a vertical settling tube (8) is fixed to the upper part of the outer wall, the upper part of the outer wall of the generating tube (5) and the inner wall of the tank body (2) are jointly sealed and fixed with an annular No. 1 sieve plate (9), the upper part of the settling tube (8) is sealed with the outer wall of the generating tube (5), and the bottom is penetrated downward, the upper part of the settling tube (8) is fixedly connected to a water outlet conduit (10), and the bottom of the outer wall and the inner wall of the tank body (2) are jointly sealed and fixed with an annular No. 2 sieve plate (11), The water inlet conduit (6), the sewage discharge conduit (7) and the water outlet conduit (10) extend outside the tank body (2); the inner cavity of the tank body (2) and the outer wall of the No. 1 sieve plate (9), the No. 2 sieve plate (11) and the sedimentation tube (8) together form a particle adsorption chamber (12); the particle adsorption chamber (12) is partially filled with suspended ball adsorption filler (13) that cannot pass through the No. 1 sieve plate (9) and the No. 2 sieve plate (11); a corrugated plate (14) inclined up and down is installed in the chamber formed by the sedimentation tube (8) and the generating tube (5); the top of the tank body (2) is fixedly connected to an upper cylinder (15); the outer wall of the upper cylinder (15) is fixedly connected to an oil collecting pipe (16), and the top is sealed.

2. A sewage treatment system for oilfield wastewater according to claim 1, characterized in that: The bottom of the tank body (2) is fixedly connected to a side manhole (17), and the penetration points between the upper manhole (15) and the side manhole (17) and the outside are sealed with a cylinder cover (18) via a fastener.

3. A sewage treatment system for oilfield wastewater according to claim 1 or 2, characterized in that: A plurality of through-going air blast pipes (19) are fixed to the bottom of the tank body (2). The bottom of the air blast pipes (19) extends outside the tank body (2), and the upper part extends vertically into the tank body (2). The vertical part of the upper part of the air blast pipes (19) is horizontally penetrated by a plurality of air blast holes (20), and plungers (21) are respectively connected to the upper and lower parts in a sealing and sliding manner. The plungers (21) can seal and block the air blast holes (20). A storage hopper (22) is respectively fixed to the top of each plunger (21). Two opposite edges of the storage hopper (22) are in contact with the inner wall of the tank body (2) and the outer wall of the sedimentation cylinder (8), and the other two opposite edges are in a vertical leak plate shape and are in contact with the adjacent storage hopper (22). The middle part of the storage hopper (22) is in a horizontal leak plate shape, and the suspended ball adsorption filler (13) cannot pass through the storage hopper (22).

4. A sewage treatment system for oilfield wastewater according to claim 3, characterized in that: The middle portion of the generating tube (5) is in the shape of a vertical cylinder, and the water inlet conduit (6) is eccentrically arranged relative to the generating tube (5).

5. A sewage treatment system for oilfield wastewater according to claim 3, characterized in that: The middle part of the generating tube (5) is in the shape of a vertical cylinder. The vortex generating device (3) further comprises a turbine (23). The turbine (23) is at the same height as the water inlet conduit (6). Two upper and lower corresponding limiting rings (24) are coaxially fixed to the middle part of the inner wall of the generating tube (5). The two limiting rings (24) are arranged on the upper and lower sides of the water inlet conduit (6). The turbine (23) is coaxially rotatably connected to the middle part of the inner wall of the generating tube (5). The turbine (23) comprises a vertical supporting tube (25). A plurality of vortex plates (26) inclined to the axis of the supporting tube (25) are fixed at equal angles on the outer wall of the supporting tube (25). Each of the vortex plates (26) is respectively located between the two limiting rings (24). The inclined side surface of the vortex plate (26) adjacent to the water inlet conduit (6) is arranged in a direction away from downward.

6. A sewage treatment system for oilfield wastewater according to claim 3, characterized in that: A plurality of horizontal and waterproof servo motors (27) are fixed to the inner wall of the sedimentation cylinder (8), and the servo motor (27) has a braking function. A flower shaft (28) is coaxially fixed to the rotating shaft of the servo motor (27), and the flower shaft (28) is axially slidably connected to a guide cylinder (29), and the guide cylinder (29) is radially fixed with corrugated plates (14) parallel to each other. The servo motor (27) is electrically connected to an external circuit control system. When the servo motor (27) rotates, it can drive the flower shaft (28) and the guide cylinder (29) to rotate through the flower shaft (28), thereby changing the inclination angle of the corrugated plate (14).

7. A sewage treatment system for oilfield wastewater according to claim 6, characterized in that: A plurality of inner electromagnets (31) are fixed to the outer wall of the sedimentation cylinder (8), and an outer electromagnet (32) is fixed to the end of each guide cylinder (29) close to the outer wall of the sedimentation cylinder (8), each inner electromagnet (31) and each outer electromagnet (32) are adjacent to each other and correspond to each other, and the inner electromagnet (31) and the outer electromagnet (32) are electrically connected to an external circuit control system.

8. A sewage treatment system for oilfield wastewater according to any one of claims 3 to 7, characterized in that: The sewage treatment system for the oilfield wastewater in the sewage tank also includes a polarization filtration and water purification device (33), which includes a sub-tank body (34), the top center of the sub-tank body (34) is fixedly connected to an upper dual-purpose pipe (35), and the top is fixedly connected to a sub-upper manhole (36), the sub-upper manhole (36) is fixedly connected to a sub-oil collecting pipe (37), the middle of the sub-tank body (34) is fixedly connected to a middle manhole (38), the penetration point between the sub-upper manhole (36) and the middle manhole (38) and the outside is sealed with a sub-tank cover (39) through a fastener, the upper part of the sub-tank body (34) is fixedly connected to a feed pipe (40), and the middle and lower part is fixedly connected to a discharge pipe (41), the bottom of the sub-tank body (34) is provided with a lower dual-purpose pipe (42), and the upper part of the sub-tank body (34) is sealed and fixed with a No. 3 sieve. The sub-tank (34) is provided with a plate (43), and a fourth sieve plate (44) is fixedly sealed at the lower part thereof; the inner cavities of the third sieve plate (43), the fourth sieve plate (44) and the sub-tank (34) are filled with filter material (45) in a non-filled manner; a centripetal air flotation device (46) is fixedly provided at the center of the upper part of the sub-tank (34); the centripetal air flotation device (46) is located above the third sieve plate (43) and is in communication with the upper dual-purpose pipe (35); a group of electric cation-eliminating water treatment devices (47) are fixedly provided at the upper and lower parts of the sub-tank (34); the electric cation-eliminating water treatment device (47) at the upper part of the sub-tank (34) is located in the open space between the third sieve plate (43) and the filler; the electric cation-eliminating water treatment device (47) at the lower part of the sub-tank (34) is located below the fourth filter plate; and the electric cation-eliminating water treatment device (47) is connected to an external power supply.

9. A sewage treatment system for oilfield wastewater according to claim 8, characterized in that: The sewage treatment system for oilfield wastewater in the sewage tank further comprises an air storage tank (48), an oil storage tank (49), a primary oil separator tank (50), an air compressor (51), a sludge tank (52), a sewage lifting pump (53), a backwash pump (54), a filter material circulation pump (55), a feeding tank (56) and a sewage tank (57); the water inlet conduit (6) is connected to a water outlet pipe of the sewage lifting pump (53); the water inlet pipe of the sewage lifting pump (53) is connected to a water outlet pipe of the sewage tank (57); the upper dual-purpose pipe (35) is connected to a water outlet conduit (10); the lower dual-purpose pipe (42) is connected to a water inlet pipe of the primary oil separator tank (50); the mud inlet pipe of the sludge tank (52) is connected to a mud discharge pipe (4) and a sewage discharge pipe (7); The liquid inlet pipe of the oil storage tank (49) is respectively connected to the oil receiving pipe (16) and the sub-oil receiving pipe (37); The air outlet of the air compressor (51) is respectively connected to the air inlet of the air storage tank (48), and the air outlet of the air storage tank (48) is respectively connected to the water inlet conduit (6), the air blowing pipe (19), the upper dual-purpose pipe (35) and the lower dual-purpose pipe (42); The outlet of the primary oil separator (50) is connected to the inlet of the backwash pump (54), and the outlet of the backwash pump (54) is connected to the lower dual-purpose pipe (42); The feeding tank (56) comprises a tank body (58), a feeding chamber (59), a washing chamber (60), a feeding pipe (61), a discharge pipe (62), a stop valve (63), a left washing bucket (64), a right washing bucket (65), a left support plate (66), a right support plate (67), a leak hole (68), a partition plate (69), a water hole (70), a main guide member (71), a sub-guide member (72), and an electric push rod (76). The tank body (58) is provided with a feeding chamber (59) and a washing chamber (60) separated from each other from left to right. The washing chamber (60) A feeding pipe (61) is fixed above the feeding chamber (59) and the washing chamber (60), and a discharge pipe (62) is fixedly connected to the bottom of each of the feeding chamber (59) and the washing chamber (60). The discharge pipe (62) and the feeding pipe (61) are respectively installed with a stop valve (63). The bottoms of the two discharge pipes (62) are connected to the feed inlet of the filter material circulation pump (55). A left rubbing and washing bucket (64) is slidably connected to the left of the washing chamber (60), and a right rubbing and washing bucket (65) is slidably connected to the right of the washing chamber (60). The right part of the left rubbing and washing bucket (64) is fixed with a plurality of horizontal A left support plate (66), a plurality of horizontal right support plates (67) are fixed in sequence from top to bottom on the left side of the right scrubbing bucket (65), the top end of the left support plate (66) is in contact with the bottom end of the right support plate (67), and a horizontal electric push rod (76) is fixed to the front and rear parts of the pool body (58) in the front and rear directions, the electric push rod (76) is electrically connected to an external circuit control system, and the push rods of the two electric push rods (76) are respectively fixed to the left scrubbing bucket (64) and the right scrubbing bucket (65), and the left support plate (66) and the right support plate (67) are A plurality of leakage holes (68) are respectively passed through in the upper and lower directions, and the leakage holes (68) can be aligned with each other in the upper and lower directions; a plurality of vertical partitions (69) are respectively fixed to the right front and right rear parts of the left scrubbing bucket (64); a plurality of water holes (70) are passed through the partitions (69) in the front-to-back direction; the inner diameter of the leakage holes (68) is larger than the inner diameter of the water holes (70); the filter material (45) can pass through the leakage holes (68) but cannot pass through the water holes (70); and a plurality of sets of main guide members (71) are respectively fixed to the left scrubbing bucket (64) and the right scrubbing bucket (65); A group of the main guide members (71) comprises two groups of sub-guide members (72) which are arranged in mirror images of each other, each group of sub-guide members (72) comprises a support shaft (73), a guide plate (75) and two limit rods (74); the support shaft (73) is fixed in a horizontal direction to adjacent pairs of side walls of the left scrubbing bucket (64) and the right scrubbing bucket (65); the two limit rods (74) in the sub-guide members (72) are fixed in a horizontal direction to left and right sides of the support shaft (73); the upper and lower spacing between the limit rods (74) in the two sub-guide members (72) in the main guide member (71) is smaller than the upper and lower spacing between the support shafts (73) in the two sub-guide members (72); each support shaft (73) is hingedly connected to a guide plate (75); each guide plate (75) can swing forward and backward and abut against the limit rod (74); The discharge pipe (41) is connected to the feeding pipe (61), and the discharge port of the filter material circulation pump (55) is connected to the feeding pipe (40).

10. The method for using a sewage treatment system for oilfield sewage according to claim 9, characterized in that: The method of use comprises the following steps: Step 101, sewage from the sewage tank (57) is transported to the water inlet conduit (6) via the sewage lifting pump (53), and dissolved gas is finally introduced into the vortex generating device (3) at the water inlet conduit (6) under the action of the air compressor (51) and the air storage tank (48), and the floating oil and dispersed oil gather inwardly in the generating tube (5) and float up with the bubbles and are finally discharged from the oil collecting tube (16), and the particles with larger mass in the generating tube (5) sink and are finally discharged from the sewage discharge pipe (7), and the separated water moves downward in the upper space of the tank body (2) and enters the particle adsorption chamber (12), and the suspended ball adsorption filler (13) in the particle adsorption chamber (12) absorbs the suspended ball adsorption filler (13) in the particle adsorption chamber (12). The suspended particles are attached to the suspended particles, so that the volume of the suspended particles increases and the weight increases. When the water flow flushes the suspended ball adsorption filler (13), the suspended particles collide with each other, so that the suspended particles with increased weight are shaken off and enter the sedimentation cylinder (8) through the sieve holes of the second sieve plate (11). After entering the sedimentation cylinder (8), the sewage flows upward and passes through the inclined corrugated plate (14). Due to the difference between the water flow direction and the sludge sedimentation direction, the flocs are deposited on the corrugated plate (14). When the sedimentation reaches a certain degree, the flocs slide down to the bottom of the tank body (2) to settle and are discharged from the sludge discharge pipe (4). The water at the top of the sedimentation cylinder (8) is finally discharged from the water outlet pipe (10); Step 102, the water discharged from the water outlet conduit (10) is dissolved with air under the action of the air storage tank (48) and the air compressor (51), and then enters the centripetal flotation device (46) through the upper dual-purpose pipe (35) to generate turbulent rotation. Under the action of centrifugal force, the oil and gas migrate inwardly, and the solid particles and water migrate outwardly. Under the dual action of centrifugal force and flotation, the oil is separated and flotated, and then discharged from the sub-oil receiving pipe (37) to the oil storage tank (48), while the water and solid particles are filtered through the third sieve plate (43) and the coarse particles are filtered and intercepted. The water filtered through the third sieve plate (43) is stabilized by the electric decationizing water treatment device (47), and then enters the filter material (45) for fine filtration and intercepts fine particles. The finely filtered water is filtered through the fourth sieve plate (44), and then polarized again by the electric decationizing water treatment device (47). After the polarization treatment, it is discharged from the lower dual-purpose pipe (42); Step 103, using the gas storage tank (48) to alternately add gas to each gas blowing pipe (19) at regular intervals, so that the plunger (21) can be intermittently lifted up under the action of the gas pressure, and the gas blowing hole (20) can intermittently discharge bubbles, and the storage hopper (22) can follow the plunger (21) to alternately move up and down, so that the suspended ball adsorption filler (13) at different positions can be alternately pushed to achieve scrubbing and collision; Step 104: using an air compressor (51) and an air storage tank (48) to blow air into the lower dual-purpose pipe (42) to loosen the filter material (45); then using a filter material circulation pump (55) to transport the filter material (45) between the third sieve plate (43) and the fourth sieve plate (44) to achieve scrubbing and washing so that the filtrate residue falls off; during this period, the filter material (45) is added as needed using a feed tank (56); Step 105, the water treated by the polarization filtration water purification device (33) enters the primary oil separator (50) via the lower dual-purpose pipe (42), and the materials in the sewage discharge pipe (7) and the sludge discharge pipe (4) flow to the sludge pool (52); Step 106, backwashing is performed on the sub-tank body (34) as required. During backwashing, the backwash water flows into the sub-tank body (34) through the backwash pump (54) and the lower dual-purpose pipe (42), and is finally discharged into the oil storage tank (49) through the upper dual-purpose pipe (35). During this period, the filter material (45) is scrubbed and the filter residues that fall off and the filter residues on the top of the third sieve plate (43) are collected together in the oil storage tank (49).

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