CN111908657B

CN111908657B - Integrated oilfield produced water treatment system

Info

Publication number: CN111908657B
Application number: CN202010742232.XA
Authority: CN
Inventors: 王宇; 陈刚; 杨海燕; 黄欢
Original assignee: Xihua University
Current assignee: TIANJIN ZHENGFANG TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-07-06
Anticipated expiration: 2040-07-29
Also published as: CN111908657A

Abstract

The invention discloses an integrated oilfield produced water treatment system, which comprises a sedimentation tank, a filter press, a vertical filter, a horizontal filter, a pipeline, a valve and a pressure pump, wherein a plurality of continuous slope-shaped flow passages are arranged in the sedimentation tank, a plurality of groups of parallel linear slope-shaped flow passages in opposite directions are formed from top to bottom, a space is reserved below a slope area of the flow passages, and the filter press, the vertical filter and the horizontal filter are placed; the highest position of the zigzag-shaped flow channel of the sedimentation tank is used as an inlet end, the lowest position of the zigzag-shaped flow channel is used as an outlet end, and the sedimentation tank is respectively provided with a corresponding sedimentation tank water inlet and a sedimentation tank water outlet; the water outlet of the sedimentation tank is connected to the inlet of the filter press through a pipeline, the outlet of the filter press is connected to the vertical filter through a pipeline, and the outlet of the vertical filter is connected to the horizontal filter. Through setting up the sedimentation reaction tank of permanent formula to be used for depositing other devices with its vacant part, make it possess better integration effect, can ensure the treatment effect of oil field extraction water when reduce cost.

Description

Integrated oilfield produced water treatment system

Technical Field

The invention relates to the technical field of oil and gas field development, in particular to the technical field of sewage treatment, and specifically relates to an integrated oil field produced water treatment system.

Background

The produced water is a byproduct of oil field exploitation, is water produced from underground, and comprises original underground water, exploitation reinjection water and the like, in the oil field exploitation process, particularly in the middle and later period exploitation, the water content of the produced crude oil can reach more than 90%, the water contains certain granular impurities, and under the action of pressure, suspended solid particles are increased and mainly comprise fine crushed sand, clay particles, silt and the like, meanwhile, the produced water of an old oil field is exploited for secondary or even tertiary exploitation, and contains a large amount of oil to form oil-water mixed liquid, so that the oil content of the produced water is high, general oil extraction sewage contains 1000-2000 mg/L crude oil, and the oil content of some crude oil can reach more than 5000 mg/L.

For the produced water of the oil field, the existing treatment scheme is that after harmless treatment is generally carried out on the produced water of the oil field, natural discharge is carried out under the condition of meeting the natural discharge, or the produced water is reinjected to the underground to drive oil and fill the stratum under the condition of meeting the reinjection condition, the state also provides corresponding design specifications for treating the produced water of the oil field GB50428-2015, and the treatment steps are generally carried out; sedimentation, filtration, deoiling, disinfection, fine filtration wherein disinfection and fine filtration part because the equipment that adopts all are the ready-made equipment of direct purchase, therefore the structural design mainly is directed against preceding sedimentation, filtration, deoiling part and designs, and this part device is as main processing system. In the market, a plurality of products are also designed aiming at related processes of a whole set of system, such as an oil field produced liquid treatment device with the publication number of CN210919014U, an advanced treatment system and a treatment method for chemical flooding oil field produced water with the publication number of CN111018251A, and an oil field produced water purification system with the publication number of CN104310630B and a control method thereof, and the treatment of the oil field produced water is realized by designing and improving the structure or the process in the prior art represented by the technical scheme, but the prior art still has a plurality of defects: 1. the integrated degree is lower, a plurality of modules are intentionally added for realizing skid-mounted transportation, transportation needs to be carried out through a plurality of skid bodies, so that the complexity of equipment is increased, but actually, the most core part of treatment of the oilfield produced water is a flocculation sedimentation part, the part needs a large amount of time, has higher requirements on space and longer requirements on time, and a large number of skid-mounted boxes are adopted, so that the function of conveniently transferring the skid-mounted boxes to each field cannot be realized, and the skid-mounted boxes can be generally stored continuously until the oilfield finishes exploitation, so that the permanent structure is adopted to better meet the actual requirements, and the research and development direction of the prior art is not completely consistent with the actual situation; 2. the stability is poor, and because the skid-mounted structure needs a large amount of assembly and connection and is of a metal structure, the skid-mounted structure can increase the difficulty of later maintenance when facing strong corrosive produced water in field use; 3. the difficulty of dredging is great, and prior art generally uses a plurality of metal ponds as the sedimentation separation pond, and its inside fatlute needs regularly separate shut down to handle, leads to the availability factor to descend. In addition, the prior art still faces many problems such as high cost, great maintenance difficulty, poor dosing mixing uniformity and the like, so the scheme in the prior art still cannot well meet the actual requirements on the site, and needs to be improved urgently.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an integrated oilfield produced water treatment system, which has a better integration effect by providing a permanent sedimentation reaction tank and using the spare part of the sedimentation reaction tank for storing other devices, so as to reduce the cost and ensure the treatment effect of oilfield produced water.

The technical scheme of the invention is as follows:

an integrated oilfield produced water treatment system comprises a sedimentation tank, a filter press, a vertical filter, a horizontal filter, a pipeline, a valve and a pressure pump, wherein the sedimentation tank is of a cuboid frame structure formed by pouring cement, a plurality of continuous slope-shaped flow channels are arranged in the sedimentation tank, a plurality of groups of parallel linear slope-shaped flow channels in opposite directions are formed from top to bottom to form a broken line structure, a flow channel partition plate is arranged between each section of linear slope flow channel, a space is reserved below a slope area of the flow channel partition plate, and the filter press, the vertical filter and the horizontal filter are placed in the space;

the sedimentation basin is characterized in that the highest position of a zigzag-shaped flow channel of the sedimentation basin is used as an inlet end, the lowest position of the zigzag-shaped flow channel is used as an outlet end, a sedimentation basin water inlet and a sedimentation basin water outlet which correspond to each other are respectively arranged on the sedimentation basin, an opening is arranged at the tail end of each section of linear slope-shaped flow channel of the sedimentation basin and used as a desilting area, the width of the desilting area is slightly smaller than that of the linear slope-shaped flow channel, a desilting water-stop plate is arranged on the inner side of the desilting area; a flow passage partition plate is arranged at the bent part of the flow passage, and the flow passage valve can be opened and closed; the water outlet of the sedimentation tank is arranged above the desilting area corresponding to the flow channel of the sedimentation tank, and an outlet door plate is arranged on the inner side of the water outlet of the sedimentation tank and can be opened and closed;

the water outlet of the sedimentation tank is connected to the inlet of the filter press through a pipeline, the outlet of the filter press is connected to the vertical filter through a pipeline, and the outlet of the vertical filter is connected to the horizontal filter.

Furthermore, 3 linear slope-shaped flow passages are arranged in the sedimentation tank, each linear slope-shaped flow passage is isolated by a flow passage partition plate and a flow passage valve to form a plurality of sub sedimentation tanks, and the 3 sub sedimentation tanks from the inlet to the outlet are a first sedimentation tank, a second sedimentation tank and a third sedimentation tank respectively;

at the slope lower extreme of sedimentation tank, be equipped with pond desilting district No. one, pond desilting district is the rectangular hole structure No. one, inside and outside the UNICOM sedimentation tank, the bottom in pond desilting district and the slope lower extreme parallel and level of sedimentation tank No. one, at the slope lower extreme of No. two sedimentation tanks, be equipped with No. two pond desilting districts, No. two pond desilting districts are the rectangular hole structure, outside in the UNICOM sedimentation tank, but the outer end size of rectangular hole is greater than inner size, its space cross-section is trapezoidal cross-section, the bottom in No. two pond desilting districts and the slope lower extreme parallel and level of No. two sedimentation tanks, at the slope lower extreme of No. three sedimentation tanks, be equipped with No. three pond desilting districts, No. three pond desilting district is the rectangular hole structure, inside and outside the UNICOM sedimentation tank, the bottom in No. three pond desilting district and.

Furthermore, a filter press and a vertical filter are placed below the first pond desilting area, a horizontal filter is placed below the second pond desilting area, the filter press is provided with 4 supports, and a space is arranged below the supports and used for placing a sludge transporting vehicle.

Further, the inboard in pond desilting district, No. two pond desilting districts, No. three pond desilting districts all is equipped with the desilting water-stop sheet, main fixed plate, picture peg, fender that include top-down setting, the top in main fixed plate desilting district is close to the inboard wall contact of sedimentation tank and fixes, and the bottom of main fixed plate is equipped with downwardly extending's pivot frame, and pivot frame upper segment is equipped with the picture peg pivot, is connected with the picture peg in the picture peg pivot, has rotary spring in the picture peg pivot, and the picture peg pivot is inboard parallel and level with the top in desilting district, and pivot frame below is equipped with the fender pivot, has rotary spring in the pivot, is equipped with decurrent fender in the fender pivot, the bottom of picture peg with the cooperation of fender; the inserting plate rotates towards the inner side of the sedimentation tank, and the mudguard rotates towards the outer side of the sedimentation tank;

two round holes are arranged on the inner wall surface of the mud removing area, the two round holes are respectively arranged at the outer side of the mud guard and the position close to the top of the mud removing area, and a mud guard pin and a mud discharging pin are respectively arranged in the two round holes; the upper side of the mud discharging pin is provided with a groove parallel to the upper side of the inner wall surface of the mud removing area, and the distance between the groove bottoms of the two grooves is the same as the width of the corresponding flow channel;

the desilting district is equipped with supporting desilting water-stop sheet, the desilting water-stop sheet is the rectangular strip platelike structure, and its width direction inserts the inslot of row's mud pin upside and keeps laminating with the tank bottom, nevertheless does not hinder the slip, and is equipped with the cushion on width direction, is equipped with the tip at its front end.

Further, the top of No. three sedimentation tanks is equipped with the frizing slide rail at its baffle and sedimentation tank wall top, installs the frizing module that can follow the slide rail motion in the frizing slide rail, the frizing module includes the frizing main part, is equipped with the frizing fixed plate in frizing main part both sides, is equipped with the slider of symmetry in the frizing fixed plate outside, the slider is installed in the frizing slide rail, and the slider has moving mechanism, can drive the frizing module along the inboard motion of frizing slide rail.

Furthermore, an oil scraping support is arranged on the outer side of the oil scraping plate main body, the oil scraping support is a frame with a strip-shaped seam in the middle, two symmetrical oil scraping lifting gears are arranged in the strip-shaped seam, the oil scraping lifting gears are connected with an oil scraping lifting motor, tooth-shaped notches are arranged on two sides of the oil scraping plate main body and are used as lifting teeth and connected with the oil scraping lifting gears to realize the lifting of the oil scraping plate main body, and an oil-water interface detector is arranged on the side face of the oil scraping support;

the middle part of the oil scraping fixed plate is provided with a hole, an oil scraping rotating shaft is arranged in the hole, the outer side of one oil scraping rotating shaft is provided with a rotating motor, the outer sides of the rotating motor and the oil scraping fixed plate on the opposite side are provided with sliding blocks, and the inner sides of the oil scraping rotating shafts are connected to the two ends of the oil scraping support;

the upper section and the lower section of the oil scraping plate main body are respectively provided with a first oil scraping brush and a second oil scraping brush.

Furthermore, oil collecting areas are respectively arranged at two ends of the third sedimentation tank, the oil collecting areas are of rectangular groove body structures with openings at the upper parts, and oil outlet holes are formed in the bottoms of the oil collecting areas;

the bottom of the oil collecting area is provided with a slope, and the bottom of the slope is flush with the bottom of the oil outlet; and the top of the wall surface of the third sedimentation tank is an inward inclined gentle slope at the part contacted with the oil collecting area, so that oil scraped by the oil scraping module can conveniently flow into the oil collecting area.

Further, an air flotation sedimentation sloping plate module is arranged in the third sedimentation tank and comprises an air flotation machine and an air flotation sedimentation sloping plate, the air flotation sedimentation sloping plate is arranged above the air flotation machine, the air flotation machine is paved at the bottom of the sedimentation tank, and the air flotation sedimentation sloping plate module keeps a certain distance from the water outlet of the sedimentation tank;

the air flotation sedimentation inclined plate is divided into two parts, wherein the majority of the inclined plates are inclined plates with different lengths, the upper ends of the inclined plates are positioned on the same horizontal line, the lower ends of the inclined plates are parallel to the bottom of the third sedimentation tank, the minority of the inclined plates are inclined plates with the same length, and the inclined plates with the same length are the longest inclined plates.

Furthermore, a medicine adding tank is arranged at the inlet of the first sedimentation tank and the inlet of the second sedimentation tank, the medicine adding tank comprises a first medicine adding tank and a second medicine adding tank, a first medicine adding tank support and a second medicine adding tank support are respectively arranged below the first medicine adding tank and the second medicine adding tank, the first medicine adding tank support is arranged above the first sedimentation tank and close to the water inlet of the sedimentation tank, and the second medicine adding tank support is arranged above the inlet section of the second sedimentation tank;

the structure that adds the medicinal cupping jar and No. two medicinal cupping jars is the same, and the size can be the same or different, and its structure all includes a jar body, stirring vane, (mixing) shaft, agitator motor, adds the medicine mouth, is equipped with conical tank bottoms in its bottom, and the tank bottoms passes a medicinal cupping jar support or No. two adds the medicinal cupping jar supports after, and the lower part is equipped with spouts the medicine gondola water faucet, is equipped with a plurality of spray tubes in spouting medicine gondola water faucet below, is equipped with a plurality of apertures on spout the medicine tube and is used for the medicament to flow out.

Further, the runner valve comprises a runner valve frame, a runner door capable of sliding up and down along the runner valve frame is arranged on the inner side of the runner valve frame, a vertical runner valve lifting lead screw is arranged at the top of the runner door, the runner valve lifting lead screw penetrates through the runner valve frame, a runner valve lifting nut is arranged on the upper side of the top of the runner valve frame, a gear is arranged on the outer side of the runner valve lifting nut, internal threads matched with the runner valve lead screw are arranged inside the runner valve lifting nut, a runner valve lifting motor is connected to the outer side of the runner valve lifting nut, and the runner valve lifting nut is driven to rotate through gear meshing.

The invention has the advantages that:

through the sedimentation basin that sets up the broken line form runner to divide it into different functional areas, make it can satisfy the requirement of the most crucial sedimentation separation step of produced water treatment, and highly integrated, the effectual region of utilizing its runner below avoids setting up more sled bodies alone.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of another aspect of the present invention;

FIG. 3 is a perspective view of the air flotation sloping plate sedimentation module removed;

FIG. 4 is a front view of the present invention;

FIG. 5 is a left side view of the present invention;

FIG. 6 is a right side view of the present invention;

FIG. 7 is a schematic structural view of an air-flotation sloping plate sedimentation module;

FIG. 8 is a cross-sectional detail view of the first canister region;

FIG. 9 is a front view of the oil scraping module;

FIG. 10 is a sectional view taken along line A-A of FIG. 9;

FIG. 11 is a front view of the flow passage valve;

FIG. 12 is a front view of the exit door panel;

FIG. 13 is a front cross-sectional view of a mud removal zone;

FIG. 14 is a sectional view showing a shape change of a door panel in a mud removing area.

In the figure:

1a settling tank main body, 2 filter presses, 3 vertical filters, 4 horizontal filters, 5 air-flotation inclined plate settling modules, 6 flow channel valves, 7 oil scraping modules, 8 desilting door panels, 9 outlet door panels, 10 desilting water-stop plates,

No. 101 sedimentation tank, No. 102 sedimentation tank, No. 103 sedimentation tank, No. 104 medicine adding tank support, No. 105 medicine adding tank support, No. 106 medicine adding tank, No. 107 medicine adding tank, 108 oil scraping slide rail, 109 flow channel valve mounting groove, 110 oil collecting area, No. 111 first pool desilting area, No. 112 second pool desilting area, No. 113 third pool desilting area, 114 sedimentation tank water outlet, 115 sedimentation tank water inlet, 116 flow channel partition board,

10601 tank body, 10602 stirring blade, 10603 stirring shaft, 10604 medicine-adding hole, 10605 tank bottom, 10606 medicine-spraying shower head, 10607 medicine-spraying pipe,

1101 an oil outlet,

501 air floating machine, 502 air floating settling inclined plate,

601 runner valve frame, 602 runner valve, 603 runner valve mounting block, 604 runner valve lifting nut, 605 runner valve lifting motor, 606 runner valve lifting screw rod,

701 oil scraping plate main body, 702A oil scraping brush, 703B oil scraping brush, 704 oil scraping lifting motor, 705 oil scraping fixing plate, 706 rotating motor, 707 oil scraping lifting gear, 708 sliding block, 709 oil scraping rotating shaft, 710 oil-water interface detector, 711 oil scraping bracket,

70101 lifting teeth,

801 main fixing plate, 802 inserting plate rotating shaft, 803 inserting plate, 804 mudguard rotating shaft, 805 mudguard, 806 mud blocking pin, 807 mud discharging pin, 808 rotating shaft frame,

901 goes out the water board frame, 902 upper water board, 903 lower water board, 904 nut, 905 upper plate fixation nut, 906 reverse thread screw rod, 907 lower plate fixation nut, 908 goes out water board lifting nut, 909 goes out water board lifting motor, 910 goes out water board lifting screw.

Detailed Description

In the following description of the present invention, it should be noted that terms such as "upper" and "lower" are used herein only for convenience of description of the drawings, and are not intended to limit the direction in actual use, and do not necessarily require or imply any actual relationship or order between such entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1-6, an integrated oilfield produced water treatment system comprises a sedimentation basin main body 1, a filter press 2, a vertical filter 3, a horizontal filter 4, a pipeline, a valve and a pressure pump (the pipeline, the valve and the pressure pump are not shown in the figure for not affecting the structural expression), wherein the sedimentation basin main body 1 is a cuboid frame structure formed by pouring cement, a sedimentation basin water inlet 115 and a sedimentation basin water outlet 114 are respectively arranged at an inlet and an outlet, 3 straight slope-shaped flow channels which are arranged side by side from top to bottom are arranged in the sedimentation basin main body, the top of each straight slope flow channel is connected to the bottom of the previous straight slope flow channel, the bottom of each straight slope flow channel is connected to the top of the next straight slope flow channel to form a broken line structure, a flow channel partition plate 116 is arranged between each section of straight slope flow channel, and a space is, a filter press 2, a vertical filter 3 and a horizontal filter 4 are arranged in the space; the 3 linear slope-shaped flow channels in the sedimentation tank are isolated from each other through flow channel partition plates 116 and flow channel valves 6 to form a plurality of sub sedimentation tanks, the 3 sub sedimentation tanks from the inlet to the outlet are respectively a first sedimentation tank 101, a second sedimentation tank 102 and a third sedimentation tank 103, a flow channel valve 6 is respectively arranged between the first sedimentation tank 101 and the second sedimentation tank 102 and between the second sedimentation tank 102 and the third sedimentation tank 103 and used for isolating the flow among the sedimentation tanks, the flow channel valve 6 comprises a flow channel valve frame 601, a flow channel door 602 capable of sliding up and down along the flow channel valve frame 601 is arranged on the inner side of the flow channel valve frame 601, a vertical flow channel valve lifting screw rod 606 is arranged at the top of the flow channel door 602 and penetrates through the flow channel valve frame 601, a flow channel valve lifting nut 604 is arranged on the upper side of the top of the flow channel valve frame 601, and gears are arranged on the outer side of the flow channel valve lifting nut 604, the internal thread matched with the runner valve 6 screw rod is arranged in the runner valve frame, the runner valve lifting nut 604 is externally connected with a runner valve lifting motor 605, the runner valve lifting nut 604 is driven to rotate through gear engagement, the two sides of the runner valve frame 601 are provided with runner valve mounting blocks 603, and runner valve 6 mounting grooves are formed in positions, corresponding to the runner valve mounting blocks 603, on the runner partition plate 116 and the inner wall of the sedimentation tank and used for mounting the runner valve mounting blocks 603, so that the runner valve 6 is stably mounted and connected.

An outlet door panel 9 is further arranged on the inner side of the sedimentation tank water outlet 114, as shown in fig. 12, the outlet door panel 9 comprises a rectangular water outlet plate frame 901, rectangular baffle plates are respectively arranged above and below the inner side of the water outlet plate frame 901 to serve as an upper water baffle plate 902 and a lower water baffle plate 903, an upper water baffle plate fixing nut 905 and a lower water baffle plate fixing nut 907 are respectively arranged on the upper water baffle plate 902 and the lower water baffle plate 903, the spiral directions of the upper water baffle plate fixing nut and the lower water baffle plate fixing nut 907 are opposite, a reverse threaded screw 906 is inserted into the upper water baffle plate fixing nut 905 and the lower water baffle plate fixing nut 907, the reverse threaded screw 906 can drive the upper water baffle plate 902 and the lower water baffle plate 903 to synchronously approach or separate from each other when rotating, and a nut 904; the upper side of the upper water baffle 902 is provided with a water outlet plate lifting screw 910 which penetrates through the water outlet plate frame 901, the upper side of the top of the water outlet plate frame 901 is provided with a water outlet plate lifting nut 908, the outer side of the water outlet plate lifting nut 908 is provided with a gear, the inner part of the water outlet plate lifting nut 908 is provided with an internal thread matched with the water outlet plate lifting screw 910, the water outlet plate lifting nut 908 is externally connected with a water outlet plate lifting motor 909, and the water outlet plate lifting nut 908 is driven to rotate through gear engagement.

According to the preferred design scheme, the first sedimentation tank 101 is used as a stirring reaction tank, the second sedimentation tank 102 is used as a flocculation sedimentation tank, and the third sedimentation tank 103 is used as an oil-water separation tank, so that a first dosing tank support 105 and a second dosing tank support 104104 are respectively arranged below the first dosing tank 106 and the second dosing tank 107, as shown in fig. 8, the first dosing tank support 105 is arranged above the first sedimentation tank 101 and close to a water inlet of the sedimentation tank 115, and the second dosing tank support 104104 is arranged above an inlet section of the second sedimentation tank 102; the first medicine adding tank 106 and the second medicine adding tank 107 are identical in structure, the first medicine adding tank and the second medicine adding tank comprise tank bodies 10601, stirring blades 10602, a stirring shaft 10603, a stirring motor and a medicine adding port 10604, a conical tank bottom 10605 is arranged at the bottom of the first medicine adding tank, after the tank bottom 10605 penetrates through a first medicine adding tank support 105 or a second medicine adding tank support 104, a medicine spraying shower 10606 is arranged at the lower part of the tank bottom, a plurality of medicine spraying pipes 10607 are arranged below the medicine spraying shower 10606, a plurality of small holes are formed in the medicine spraying pipes 10607 and used for flowing out of medicines, the length of each medicine spraying pipe 10607 can extend into produced water to stir the produced water to enable the produced water to be disturbed and mixed, and when necessary, the medicine spraying shower 10606 can be arranged to be of a rotating structure, so that the produced. A coagulant is filled in the first chemical adding tank 106, mainly comprises polyaluminium chloride, polyferric sulfate and the like, is used for eliminating partial solid suspended matters and oil content in the first settling tank 101, and can design the formula and the proportion according to the actual conditions of different oil field produced water, so that the effect of aggregating solid suspended matter particles in oil-containing produced water together as much as possible in the early stage is achieved, and the difficulty of solid phase treatment in the later stage is reduced; the second dosing tank 107 is internally provided with a stabilizer which mainly comprises a demulsifier, a deoxidant, a bactericide, a pH regulator and the like and is used for adjusting the pH value of the produced water, eliminating partial bacteria, reducing the COD content, scattering the water-in-oil structure and facilitating later oil removal.

In order to enable the three sedimentation tanks to better exert respective effects, the width of the first sedimentation tank 101 is larger than that of the second sedimentation tank 102, the second sedimentation tank 102 is larger than that of the third sedimentation tank 103, the slopes of the first sedimentation tank 101 and the third sedimentation tank 103 are the same, and the slope of the second sedimentation tank 102 is larger than that of the first sedimentation tank 101 and the third sedimentation tank 103, so that a large amount of medicaments can be conveniently and uniformly mixed.

As shown in fig. 13-14, a mud removal zone is provided at the end of each settling tank, and, in particular, a first-tank desilting area 111 is arranged at the lower end of the slope of the first sedimentation tank 101, the first-tank desilting area 111 is of a rectangular hole structure and is communicated with the inside and the outside of the sedimentation tank, the bottom of the first-tank desilting area 111 is flush with the lower end of the slope of the first sedimentation tank 101, the lower end of the slope of the second settling pond 102 is provided with a second pond desilting area 112, the second pond desilting area 112 is of a rectangular hole structure and is communicated with the inside and the outside of the settling pond, but the size of the outer end of the rectangular hole is larger than that of the inner end, the space section is a trapezoid section, the bottom of the second tank desilting area 112 is flush with the lower end of the slope of the second settling tank 102, a third-tank desilting area 113 is arranged at the lower end of the slope of the third settling tank 103, the third-tank desilting area 113 is of a rectangular hole structure and communicated with the inside and the outside of the settling tank, and the bottom of the third-tank desilting area 113 is flush with the lower end of the slope of the third settling tank 103; the widths of the three mud removing areas are slightly smaller than the width of the flow channel where the three mud removing areas are located.

The inner sides of the first pond desilting area 111, the second pond desilting area 112 and the third pond desilting area 113 are respectively provided with a desilting door plate 8, each desilting door plate 8 comprises a main fixing plate 801, an inserting plate 803 and a mudguard 805 which are arranged from top to bottom, the upper part of the desilting area of the main fixing plate 801 is close to the wall surface of the inner side of the sedimentation pond and is contacted and fixed, the bottom of the main fixing plate 801 is provided with a downwardly extending rotating shaft frame 808, the upper section of the rotating shaft frame 808 is provided with an inserting plate rotating shaft 802, the inserting plate rotating shaft 802 is connected with the inserting plate 803, the inserting plate rotating shaft 802 is provided with a rotary spring, the inserting plate rotating shaft 802 is flush with the inner side of the top of the desilting area, the lower part of the rotating shaft frame 808 is provided with a mudguard rotating shaft 804, the mudguard rotating shaft 804 is provided with a; the inserting plate 803 rotates towards the inner side of the sedimentation tank, and the mud guard 805 rotates towards the outer side of the sedimentation tank; two round holes are arranged on the inner wall surface of the mud removing area, the two round holes are respectively arranged at the outer side of the mud guard 805 and the position close to the top of the mud removing area, and a mud guard pin 806 and a mud discharging pin 807 are respectively arranged in the two round holes; the upper side of the mud discharging pin 807 is provided with a groove parallel to the upper side of the inner wall surface of the mud removing area, and the distance between the groove bottoms of the two grooves is the same as the width of the corresponding flow channel; the desilting district is equipped with supporting desilting water-stop sheet 10, desilting water-stop sheet 10 is the rectangular strip platelike structure, and its width direction inserts the inslot of row's mud pin 807 upside and keeps the laminating with the tank bottom, nevertheless does not hinder the slip, and is equipped with the cushion on width direction, is equipped with the tip at its front end. By adopting the structure, the sedimentation tank can independently carry out desilting operation under the condition of not discharging light water, and the process does not hinder normal sedimentation work. The solid-phase sediment can be accumulated under the action of gravity and water force, and is convenient for centralized treatment.

The top of the third settling tank 103 is provided with an oil scraping slide rail 108 on the top of the partition board and the wall of the settling tank, an oil scraping module 7 capable of moving along the slide rail is installed in the oil scraping slide rail 108, the oil scraping module 7 comprises an oil scraping plate main body 701701, oil scraping fixing plates 705 are arranged on two sides of the oil scraping plate main body 701, symmetrical slide blocks 708 are arranged on the outer sides of the oil scraping fixing plates 705, the slide blocks 708 are installed in the oil scraping slide rail 108, and the slide blocks 708 are provided with a moving mechanism capable of driving the oil scraping module 7 to move along the inner side of the oil scraping slide rail 108. The slider 708 may be any type of prior art electric traction slider or self-walking slider configuration.

As shown in fig. 9-10, an oil scraping support 711 is arranged on the outer side of the oil scraping plate main body 701, the oil scraping support 711 is a frame with a strip-shaped slit in the middle, two symmetrical oil scraping lifting teeth 70101 and wheels 707 are arranged in the strip-shaped slit, the oil scraping lifting teeth 70101 and the wheels 707 are connected with an oil scraping lifting motor 704, tooth-shaped notches are arranged on two sides of the oil scraping plate main body 701 and are used as lifting teeth 70101 and connected with the oil scraping lifting teeth 70101 and the wheels 707 to realize the lifting of the oil scraping plate main body 701, and an oil-water interface detector 710 is arranged on the side surface of the oil scraping support 711; a hole is formed in the middle of the oil scraping fixing plate 705, oil scraping rotating shafts 709 are installed in the hole, a rotating motor 706 is arranged outside one of the oil scraping rotating shafts 709, sliding blocks 708 are arranged outside the rotating motor 706 and outside the oil scraping fixing plate 705 on the opposite side, and the inner side of each oil scraping rotating shaft 709 is connected to two ends of an oil scraping bracket 711; the upper section and the lower section of the oil scraping plate main body 701 are respectively provided with a first oil scraping brush 702 and a second oil scraping brush 703, and the first oil scraping brush 702 and the second oil scraping brush 703 can be made of the same material or different materials so as to deal with different oil layers. Adopt the processing of oil slicking module 7 of above-mentioned structure can effectively improve the oil layer that floats, and especially the difference floats the pertinence of oil layer and handles to the degree of accurate control oil-water separation avoids too much water to be scraped.

An oil collecting region 110 is respectively arranged at two ends of the third sedimentation tank 103, the oil collecting region 110 is of a rectangular groove body structure with an opening at the upper part, and an oil outlet 1101 is arranged at the bottom of the oil collecting region 110; the bottom of the oil collecting area 110 is provided with a slope, and the bottom of the slope is flush with the bottom of the oil outlet 1101; the top of the wall surface of the third settling tank 103 at the part contacting the oil collecting area 110 is a gentle slope inclined inwards, so that oil scraped by the oil scraping module 7 can flow into the oil collecting area 110 conveniently.

As shown in fig. 7, an air flotation sedimentation sloping plate module 5 is arranged in the third sedimentation tank 103, the air flotation sedimentation sloping plate module 5 comprises an air flotation machine 501 and an air flotation sedimentation sloping plate 502, the air flotation sedimentation sloping plate 502 is arranged above the air flotation machine 501, the air flotation machine 501 is laid at the bottom of the sedimentation tank, and the air flotation sedimentation sloping plate module 5 keeps a certain distance from the sedimentation tank water outlet 114; the air flotation sedimentation sloping plate 502 is divided into two parts, wherein the majority of the air flotation sedimentation sloping plates are sloping plates with different lengths, the upper ends of the sloping plates are positioned at the same horizontal line, the lower ends of the sloping plates are parallel to the bottom of the third sedimentation tank 103, the minority of the sloping plates are sloping plates with the same length, the sloping plates with the same length are the longest sloping plates, and the sloping plates with the same length can reduce the obstruction to the sediment removal.

Place pressure filter 2 and vertical filter 3 below pond desilting district 111, place horizontal filter 4 below No. two desilting districts, pressure filter 2 is equipped with 4 supports, has one section space in the support below for place fortune mud car (not shown in the figure), fortune mud car can set up to hand push wooden handcart structure, makes it place pressure filter 2 below when needs. Sedimentation tank delivery port 114 passes through the entry of pipe connection to pressure filter 2, the export of pressure filter 2 passes through pipe connection to vertical filter 3, the exit linkage of vertical filter 3 is to horizontal filter 4, and horizontal filter 4 is fine filter, the water that theoretically comes out from horizontal filter 4, can satisfy the user demand of on-the-spot reinjection water or cleaning equipment water, if need discharge to natural environment, then should add auxiliary device such as establish ultraviolet sterilizing equipment, can increase a small-size sled body alone, before each filtration process, in order to improve filtration efficiency, can set up a interim water storage tank, the extraction of conveniently filtering, interim water storage tank can directly be placed near, need not to set up protection device such as sled dress deliberately.

The valve and the sewage pump used in the invention can be selected according to the discharge capacity, and the size and the water demand of the sedimentation tank can also be designed according to the requirement, but the minimum capacity is not less than 20 cubic meters.

The using process of the invention is as follows:

pumping the produced water into a water inlet 115 of a sedimentation tank, closing the first tank desilting area 111 and the flow channel valve 6 at the moment, fully reacting the medicament filled in the first dosing tank 106 with the produced water, moving upwards to open the flow channel valve 6, allowing the produced water in the first sedimentation tank 101 to enter a second sedimentation tank 102 and react with the second sedimentation tank 107; then, water in the second settling tank 102 enters the third settling tank 103, a large amount of oil is gathered on the surface layer through air flotation, after the oil layer is gathered to a certain thickness, the thickness of the oil layer is detected through an oil-water interface detector 710 arranged on the oil scraping module 7, then the oil scraping module 7 is started to scrape the oil layer to the oil collecting area 110, and the oil layer is conveyed to a waste oil recovery tank arranged outside through an oil outlet 1101 of the oil collecting area 110, and the oil scraping module 7 moves in a left-right circulating mode, so that the oil collecting areas 110 on the two sides can be used intermittently; and (3) conveying the water body from the third sedimentation tank 103 into a filter press 2 through a pipeline, then conveying the water from the filter press 2 into a vertical filter 3, wherein the vertical filter 3 adopts a walnut shell filter, the effluent water enters a horizontal filter 4, and the horizontal filter 4 is a fine filter to finish the filtration. Sending into a water storage tank for storage for later use.

When the module 7 that scrapes oil needs adjust its height, can go up and down, realize scraping to different oil reservoirs, can change a scraping brush 702 or No. two scraping brushes 703 when the oil reservoir viscosity is different by the rotation, make its can be better satisfy the oil reservoir needs, need with the hard scraping brush of oil like the viscous crude, light oil needs with soft scraping brush of oil.

The outlet door plate 9 can be adjusted to different widths and heights so as to ensure that the water layer coming out of the third sedimentation tank 103 is just in the middle, and the burden is reduced for subsequent treatment.

After a large amount of solid-phase sediment is deposited at the bottom of a single flow channel in the sedimentation tank, the mud removal water stop plate 10 can be inserted from the inserting plate 803, the inserting plate 803 is pushed open and then rotates upwards, the mud removal water stop plate 10 is inserted to the bottom, the produced water in the mud removal water stop plate can be isolated, then the mud stop pin 806 is taken down, the mud stop plate 805 is lifted upwards at the moment, the mud discharge pin 807 is fixed at the position so as to keep the lifted state, at the moment, the solid-phase sediment is taken out from the inside to the outside by a shovel, then the mud stop plate 805 is closed again and fixed by the mud stop pin 806, and then the mud removal water stop plate 10 is pulled out, so that the desilting.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An integrated oilfield produced water treatment system comprises a sedimentation tank, a filter press, a vertical filter, a horizontal filter, a pipeline, a valve and a pressure pump, and is characterized in that the sedimentation tank is of a cuboid frame structure formed by pouring cement, a plurality of continuous slope-shaped flow channels are arranged in the sedimentation tank, a plurality of groups of parallel linear slope-shaped flow channels with opposite directions are formed from top to bottom to form a broken line structure, a flow channel partition plate is arranged between each section of linear slope flow channel, a space is reserved below a slope area, and the filter press, the vertical filter and the horizontal filter are placed in the space;

the water outlet of the sedimentation tank is connected to the inlet of a filter press through a pipeline, the outlet of the filter press is connected to a vertical filter through a pipeline, and the outlet of the vertical filter is connected to a horizontal filter;

3 linear slope-shaped flow passages are arranged in the sedimentation tank, each linear slope-shaped flow passage is isolated by a flow passage partition plate and a flow passage valve to form a plurality of sub sedimentation tanks, and the 3 sub sedimentation tanks from the inlet to the outlet are a first sedimentation tank, a second sedimentation tank and a third sedimentation tank respectively;

the device comprises a sedimentation tank, a first sedimentation tank, a second sedimentation tank, a third sedimentation tank, a fourth sedimentation tank, a fifth sedimentation tank, a sixth sedimentation tank, a fourth sedimentation tank, a fifth sedimentation tank, a sixth sedimentation tank, a fifth sedimentation tank, a sixth sedimentation tank;

a filter press and a vertical filter are placed below the first pond desilting area, a horizontal filter is placed below the second pond desilting area, the filter press is provided with 4 supports, and a space is formed below each support and used for placing a mud conveying vehicle;

the inboard in a pond desilting district, No. two pond desilting districts, No. three pond desilting districts all is equipped with the desilting water-stop sheet, main fixed plate, picture peg, the fender that includes top-down setting, the top in main fixed plate desilting district is close to the inboard wall contact of sedimentation tank and fixes, and the bottom of main fixed plate is equipped with downwardly extending's pivot frame, and pivot frame upper segment is equipped with the picture peg pivot, is connected with the picture peg in the picture peg pivot, has rotary spring in the picture peg pivot, and the picture peg pivot is inboard parallel and level with the top in desilting district, and pivot frame below is equipped with the fender pivot, has rotary spring in the pivot, is equipped with decurrent fender in the fender pivot, the bottom of picture peg with; the inserting plate rotates towards the inner side of the sedimentation tank, and the mudguard rotates towards the outer side of the sedimentation tank;

2. The integrated oilfield produced water treatment system according to claim 1, wherein an oil scraping slide rail is arranged on the top of the third settling tank on the top of a partition plate and the top of the wall of the settling tank, an oil scraping module capable of moving along the slide rail is installed in the oil scraping slide rail, the oil scraping module comprises an oil scraping plate main body, oil scraping fixing plates are arranged on two sides of an oil scraping main plate, symmetrical sliding blocks are arranged on the outer sides of the oil scraping fixing plates, the sliding blocks are installed in the oil scraping slide rail, and the sliding blocks are provided with moving mechanisms and can drive the oil scraping module to move along the inner side of the oil scraping slide rail.

3. The integrated oilfield produced water treatment system according to claim 2, wherein an oil scraping support is arranged on the outer side of the oil scraping main board, the oil scraping support is a frame with a strip-shaped seam in the middle, two symmetrical oil scraping lifting gears are arranged in the strip-shaped seam, the oil scraping lifting gears are connected with an oil scraping lifting motor, tooth-shaped notches are arranged on two sides of the oil scraping main board and are used as lifting teeth and connected with the oil scraping lifting gears to realize lifting of the oil scraping main board, and an oil-water interface detector is arranged on the side surface of the oil scraping support;

the upper section and the lower section of the oil scraping main board are respectively provided with a first oil scraping brush and a second oil scraping brush.

4. An integrated oilfield produced water treatment system according to claim 3, wherein oil collecting regions are respectively arranged at two ends of the third settling tank, the oil collecting regions are of rectangular groove body structures with openings at the upper parts, and oil outlet holes are formed in the bottoms of the oil collecting regions;

5. The integrated oilfield produced water treatment system according to claim 4, wherein an air flotation sedimentation sloping plate module is arranged in the third sedimentation tank and comprises an air flotation machine and an air flotation sedimentation sloping plate, the air flotation sedimentation sloping plate is arranged above the air flotation machine, the air flotation machine is laid at the bottom of the sedimentation tank, and the air flotation sedimentation sloping plate module is kept at a certain distance from a water outlet of the sedimentation tank;

6. An integrated oilfield produced water treatment system according to claim 1 or 5, wherein the first sedimentation tank and the second sedimentation tank are provided with dosing tanks at their inlets, the dosing tanks include a first dosing tank and a second dosing tank, a first dosing tank support and a second dosing tank support are respectively provided below the first dosing tank and the second dosing tank, the first dosing tank support is provided above the first sedimentation tank at a position close to the inlet of the sedimentation tank, and the second dosing tank support is provided above the inlet section of the second sedimentation tank;

7. The integrated oilfield produced water treatment system according to claim 6, wherein the flow channel valve comprises a flow channel valve frame, a flow channel door capable of sliding up and down along the flow channel valve frame is arranged on the inner side of the flow channel valve frame, a vertical flow channel valve lifting lead screw is arranged at the top of the flow channel door, the flow channel valve lifting lead screw penetrates through the flow channel valve frame, a flow channel valve lifting nut is arranged on the upper side of the top of the flow channel valve frame, a gear is arranged on the outer side of the flow channel valve lifting nut, an internal thread matched with the flow channel valve lead screw is arranged inside the flow channel valve lifting nut, a flow channel valve lifting motor is connected to the outer side of the flow channel valve lifting nut, and the flow.