CN219929882U - Oilfield water purification device - Google Patents
Oilfield water purification device Download PDFInfo
- Publication number
- CN219929882U CN219929882U CN202321619532.4U CN202321619532U CN219929882U CN 219929882 U CN219929882 U CN 219929882U CN 202321619532 U CN202321619532 U CN 202321619532U CN 219929882 U CN219929882 U CN 219929882U
- Authority
- CN
- China
- Prior art keywords
- water
- pump
- liquid inlet
- outlet
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002332 oil field water Substances 0.000 title claims abstract description 61
- 238000000746 purification Methods 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 157
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 139
- 238000003860 storage Methods 0.000 claims abstract description 85
- 239000008234 soft water Substances 0.000 claims abstract description 61
- 239000012071 phase Substances 0.000 claims abstract description 45
- 238000001704 evaporation Methods 0.000 claims abstract description 39
- 230000008020 evaporation Effects 0.000 claims abstract description 39
- 239000007791 liquid phase Substances 0.000 claims abstract description 8
- 239000010865 sewage Substances 0.000 claims description 70
- 239000012267 brine Substances 0.000 claims description 33
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 33
- 238000010992 reflux Methods 0.000 claims description 14
- 238000009270 solid waste treatment Methods 0.000 claims description 13
- 239000003208 petroleum Substances 0.000 claims description 11
- 239000002910 solid waste Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 18
- 239000010802 sludge Substances 0.000 abstract description 14
- 239000010779 crude oil Substances 0.000 abstract description 12
- 239000003795 chemical substances by application Substances 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 57
- 239000000126 substance Substances 0.000 description 13
- 239000013078 crystal Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 238000005189 flocculation Methods 0.000 description 6
- 230000016615 flocculation Effects 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000007701 flash-distillation Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000703 high-speed centrifugation Methods 0.000 description 2
- 239000011499 joint compound Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- -1 comprising: silt Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 125000005608 naphthenic acid group Chemical group 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
Abstract
The utility model relates to an oilfield water purification device, comprising: a three-phase separator, a centrifuge, a flash tower, a vacuum ejector and a soft water temporary storage tank; the liquid outlet of the three-phase separator is connected with the liquid inlet of the centrifugal machine; the water outlet of the centrifugal machine is connected with the liquid inlet of the flash evaporation tower; the liquid phase outlet of the tower bottom of the flash tower is connected with the liquid inlet of the centrifugal machine; the gas phase outlet at the top of the flash tower is connected with a soft water temporary storage tank through a vacuum ejector. According to the oilfield water purification device, the water treatment agent is not added in the use process, so that a large amount of sludge caused by the water treatment agent is avoided; the treated water is reinjected in proportion, so that the scale-blocked pipeline can be dredged; the geothermal energy of crude oil is utilized, and the energy consumption in the oilfield water treatment process is reduced. The cost of oil field water treatment is reduced, the oil field water treatment efficiency is improved, and scaling blockage caused by water reinjection is avoided.
Description
Technical Field
The utility model belongs to the technical field of special equipment for oil fields, and particularly relates to an oil field water purifying device.
Background
In the middle and later period of petroleum exploitation, the water content of produced liquid is continuously increased, the oil-containing sewage is increased, and in the production process of the oil field, the oil-containing sewage of the oil field mainly comes from a crude oil dewatering station, and then the bottom water of various crude oil storage tanks, the sewage obtained by washing crude oil with clear water with high salt content, well washing wastewater entering a sewage treatment station and the like are used. Because the oilfield oily sewage is mainly used for reinjection after being treated, the main target pollutants for treatment are oil substances and suspended matters.
In the process of removing oil substances, suspended matters can be removed to different degrees, so that in the treatment of oily sewage in an oil field, an oil-water separation technology and a filtering technology form a main body of a conventional treatment flow, and chemical treatment measures such as scale prevention, corrosion inhibition, sterilization and the like are adopted to meet the sewage discharge standard.
However, in the sewage treatment process, the addition amount of water treatment agents such as a water quality regulator, a flocculating agent, a bactericide and the like is large, the yield of sludge is high, and the difficulty of sludge discharge, treatment and disposal is increased. The chemical oil displacement cleans the stone in the oil layer very clean, brings accompanying water too complex, and repeatedly reinjects the complex influence into the oil layer. Incomplete water reinjection can lead to unbalanced mineral dissolution and consequent scaling and blockage.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides an oilfield water purification device. The technical problems to be solved by the utility model are realized by the following technical scheme:
an oilfield water purification apparatus, comprising:
a three-phase separator, a centrifuge, a flash tower, a vacuum ejector and a soft water temporary storage tank;
the liquid outlet of the three-phase separator is connected with the liquid inlet of the centrifugal machine;
the water outlet of the centrifugal machine is connected with the liquid inlet of the flash tower;
the liquid phase outlet of the tower bottom of the flash tower is connected with the liquid inlet of the centrifugal machine;
and a gas phase outlet at the top of the flash tower is connected with the soft water temporary storage tank through the vacuum ejector.
In a specific embodiment, the method further comprises: a sewage collection pump, a sewage storage tank and a centrifugal liquid inlet pump;
the liquid outlet of the three-phase separator is connected with the liquid inlet of the centrifugal machine through the sewage collecting pump, the sewage storage tank and the centrifugal liquid inlet pump;
the liquid outlet of the three-phase separator is connected with the liquid inlet of the sewage collecting pump;
the liquid outlet of the sewage collecting pump is connected with the liquid inlet of the sewage storage tank;
the liquid outlet of the sewage storage tank is connected with the liquid inlet of the centrifugal liquid inlet pump;
and a liquid outlet of the centrifugal liquid inlet pump is connected with a liquid inlet of the centrifugal machine.
In a specific embodiment, the method further comprises: brine reflux pump;
the flash tower is connected with a liquid inlet of the centrifugal machine through the brine reflux pump, the sewage storage tank and the centrifugal liquid inlet pump;
a tower bottom liquid phase outlet of the flash tower is connected with a liquid inlet of the brine reflux pump;
and a liquid outlet of the brine reflux pump is connected with a liquid inlet of the sewage storage tank.
In a specific embodiment, the method further comprises: the device comprises a petroleum collection tank, a clear water collection tank and a solid waste treatment device;
an oil outlet of the centrifugal machine is connected with an oil inlet of the oil collecting tank;
the water outlet of the centrifugal machine is connected with the liquid inlet of the flash evaporation tower through the clear water collecting tank;
the solid waste outlet of the centrifugal machine is connected with the solid waste treatment device.
In a specific embodiment, the oil outlet of the oil collection tank is connected to the inlet of the three-phase separator.
In a specific embodiment, the method further comprises: a clear water storage tank and a flash evaporation liquid inlet pump;
the clear water collection tank is connected with the liquid inlet of the flash evaporation tower through the clear water storage tank and the flash evaporation liquid inlet pump;
the liquid outlet of the clean water collecting tank is connected with the liquid inlet of the clean water storage tank;
and a liquid outlet of the clear water storage tank is connected with a liquid inlet of the flash evaporation tower through the flash evaporation liquid inlet pump.
In a specific embodiment, the device further comprises a clear water reinjection pump; the liquid outlet of the clear water storage tank is also connected with the liquid inlet of the clear water reinjection pump.
In a specific embodiment, a flash heater is also included;
a liquid outlet of the flash evaporation liquid inlet pump is connected with a liquid inlet of the flash evaporation heater;
and a liquid outlet of the flash evaporation heater is connected with a liquid inlet of the flash evaporation tower.
In a specific embodiment, the method further comprises: soft water outlet pump;
the liquid outlet of the soft water temporary storage tank is connected with the liquid inlet of the soft water liquid outlet pump.
In a specific embodiment, the vacuum circulating pump is further included;
the soft water temporary storage tank is connected with a liquid inlet of the vacuum circulating pump;
and the outlet of the vacuum circulating pump is connected with the inlet of the vacuum ejector.
Compared with the prior art, the utility model has the beneficial effects that: according to the oilfield water purification device provided by the utility model, concentrated brine obtained from the tower bottom of the flash evaporation tower in the flash evaporation process flows back to the centrifugal machine to serve as seed crystals, so that sewage flocculation is promoted, a water treatment agent is not added in the oilfield water purification process, and a large amount of sludge caused by the water treatment agent is avoided; the clear water obtained by the centrifugal machine is further processed into soft water through the flash tower, and the soft water and the clear water obtained by the centrifugal machine are reinjected in proportion, so that a pipeline with blocked scale can be dredged; the geothermal energy of crude oil is utilized, and the energy consumption in the oilfield water treatment process is reduced. The cost of oil field water treatment is reduced, the oil field water treatment efficiency is improved, and scaling blockage caused by water reinjection is avoided.
Drawings
FIG. 1 is a schematic view of an oilfield water purification apparatus in accordance with an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a three-phase separator in an embodiment of the utility model;
fig. 3 is a schematic diagram of the structure of a flash column in an embodiment of the utility model.
Reference numerals:
1: a three-phase separator; 2: a sewage collection pump; 3: a sewage storage tank; 4: centrifuging a liquid inlet pump; 5: a centrifuge; 6: a petroleum collection tank; 7: a clean water collection tank; 8: a solid waste treatment device; 9: a clean water storage tank; 10: clear water reinjection pump; 11: flash evaporation liquid inlet pump; 12: a flash heater; 13: a flash column; 14: brine reflux pump; 15: a vacuum ejector; 16: a vacuum circulation pump; 17: soft water outlet pump; 18: soft water temporary storage tank.
Detailed Description
The present utility model will be described in further detail with reference to specific examples, but embodiments of the present utility model are not limited thereto.
Example 1
Referring to fig. 1, an oilfield water purification apparatus includes: a three-phase separator 1, a centrifuge 5, a flash tower 13, a vacuum ejector 15 and a soft water temporary storage tank 18.
Wherein, the liquid outlet of three-phase separator 1 is connected with the inlet of centrifuge 5, and the inlet of flash column 13 is connected to the delivery port of centrifuge 5, and flash column 13 tower cauldron liquid phase outlet is connected with the inlet of centrifuge 5, and flash column 13 top of the tower gaseous phase outlet passes through vacuum ejector 15 and connects soft water temporary storage tank 18.
Specifically, referring to fig. 2, the three-phase separator 1 is a horizontal separator with a liquid inlet cyclone, the top is emptied under overpressure, an inclined plate, ultrasonic and coalescent filler are integrated inside, the bottom of the liquid level is automatically drained, and the upper part of the liquid level is drained.
The centrifuge 5 is an explosion-proof horizontal centrifuge made of 316L material and resistant to mineral abrasion, brine and bacterial corrosion, and the separation factor is not lower than 4000.
The oil field water enters a three-phase separator 1, is separated by density under the combined actions of rotary centrifugation, gravity sedimentation, coalescence separation and ultrasonic vibration, and a small amount of oil gas is discharged from the upper part along with the oil phase and enters oil field oil collecting equipment. Sediment sewage is deposited at the lower part and enters the centrifugal machine 5 as sewage to be treated. The sewage in the centrifuge 5 is separated into three phases of oil, water and mud by high-speed centrifugation, wherein the water phase enters a flash tower 13. The water phase forms a flash evaporation phenomenon in the flash evaporation tower 13, water vapor is formed at the tower top, concentrated brine is formed at the tower bottom, the water vapor at the tower top passes through the vacuum ejector 15, after being naturally cooled by air, enters the soft water temporary storage tank 18, and the concentrated brine at the tower bottom returns to the centrifugal machine 5 to serve as flocculation seed crystals.
After being treated by the three-phase separator 1 and the centrifuge 5, the oilfield water enters the flash tower 13 for flash evaporation, and finally soft water is obtained through treatment. In the flash evaporation process, the tower kettle obtains concentrated brine, and the concentrated brine returns to the centrifugal machine 5 to serve as a flocculating seed crystal to promote flocculation of sewage, so that the whole treatment process does not need to add a sewage treatment agent, and the concentrated brine obtained in the treatment process is reasonably utilized to achieve the effect of the sewage treatment agent.
Further, an oilfield water purification apparatus further comprises: a sewage collection pump 2, a sewage storage tank 3 and a centrifugal liquid inlet pump 4. The liquid outlet of the three-phase separator 1 is connected with the liquid inlet of a centrifugal machine 5 through a sewage collecting pump 2, a sewage storage tank 3 and a centrifugal liquid inlet pump 4. Wherein, the liquid outlet of three-phase separator 1 connects the inlet of sewage collection pump 2, and the inlet of sewage storage tank 3 is connected to the liquid outlet of sewage collection pump 2, and the inlet of centrifugal feed pump 4 is connected to the liquid outlet of sewage storage tank 3, and the inlet of centrifuge 5 is connected to the liquid outlet of centrifugal feed pump 4.
The middle of the three-phase separator 1 and the centrifugal machine 5 is provided with a sewage collecting pump 2, a sewage storage tank 3 and a centrifugal liquid inlet pump 4 in sequence. The sewage containing sludge at the liquid phase bottom of the three-phase separator 1 enters the sewage storage tank 3 from a liquid outlet at the bottom of the three-phase separator 1 through the sewage collecting pump 2, the sewage storage tank 3 is provided with a tank bottom liquid inlet and liquid outlet sharing port for preventing sludge sedimentation and consolidation, and jet flow impacts a bottom sedimentation layer, so that the interior of the sewage storage tank 3 is uniform as much as possible, hard scale accumulation is avoided, and static electricity is dissipated. The sewage in the sewage storage tank 3 enters a centrifugal machine 5 through a centrifugal liquid inlet pump 4.
Further, an oilfield water purification apparatus further comprises: brine reflux pump 14. Wherein, flash column 13 tower cauldron liquid phase export is connected the inlet of brine backwash pump 14, and the inlet of sewage storage tank 3 is connected to the liquid outlet of brine backwash pump 14. The liquid outlet of the sewage storage tank 3 is connected with the liquid inlet of the centrifugal liquid inlet pump 4, and the liquid outlet of the centrifugal liquid inlet pump 4 is connected with the liquid inlet of the centrifugal machine 5. The brine reflux pump 14 provides power for the concentrated brine, and pumps the concentrated brine back to the sewage storage tank 3, so that the concentrated brine at the tower bottom of the flash tower 13 enters the centrifugal machine 5 through the sewage storage tank 3 and the centrifugal liquid inlet pump 4.
Specifically, referring to fig. 3, the flash tower 13 is a double-layer packed tower, the upper part is fed, water vapor is discharged from the top after passing through a demister, and the evaporated and concentrated brine is discharged from the bottom; the lower part of the tower is provided with a steam stripping standby interface, if harmful gas in the system is generated, air and the like can be introduced to treat the harmful gas; the bottom of the tower is not less than 7 m away from the ground, is vertically provided with an anti-scale purging interface, and is smoothly butted with the screw type brine reflux pump 14 after passing through the filter. Concentrated brine in the tower kettle is conveyed back to the sewage storage tank 3 through the brine reflux pump 14 and then enters the centrifugal machine 5 through the centrifugal liquid inlet pump 4 to be used as flocculation seed crystal. The sewage storage tank 3 is provided with a tank bottom liquid inlet and liquid outlet shared port for preventing sludge settlement consolidation, a radar liquid level gauge is added at the top, and an insulating layer for reducing geothermal energy loss is arranged outside.
Further, an oilfield water purification apparatus further comprises: a petroleum collection tank 6, a clear water collection tank 7 and a solid waste treatment device 8. The oil outlet of the centrifugal machine 5 is connected with the oil inlet of the oil collecting tank 6, the water outlet of the centrifugal machine 5 is connected with the liquid inlet of the flash tower 13 through the clear water collecting tank 7, and the solid waste outlet of the centrifugal machine 5 is connected with the solid waste treatment device 8.
Specifically, the petroleum collection tank 6, the clear water collection tank 7 and the solid waste treatment device 8 are arranged at a position lower than the centrifugal machine 5, so that the discharged materials are not blocked, and the force field and the flow balance inside the centrifugal machine 5 are not disturbed. The water phase separated by the centrifugal machine 5 enters a clean water collecting tank 7, the oil phase enters a petroleum collecting tank 6, and the solid waste enters a solid waste treatment device 8. The solid waste treatment device 8 is a soil collecting vehicle and the like, and solid waste can be directly collected through the soil collecting vehicle for incineration, decomposition or direct outsourcing treatment.
In the embodiment, the oil outlet of the oil collecting tank 6 is connected with the inlet of the three-phase separator 1, and the oil phase separated by the centrifugal machine 5 is recycled into the three-phase separator 1 through the oil collecting tank 6, so that no oil leakage is ensured, and the oil collecting rate is improved. The clear water collecting tank 7 is connected with the flash tower 13, and clear water obtained by separation of the centrifugal machine 5 enters the flash tower 13 through the clear water collecting tank 7 for flash evaporation treatment.
Further, an oilfield water purification apparatus further comprises: a clear water storage tank 9 and a flash feed pump 11. Wherein, clear water collection tank 7 passes through clear water storage tank 9 and flash distillation feed pump 11 and connects flash distillation tower 13 inlet, and the inlet of clear water storage tank 9 is connected to the liquid outlet of clear water collection tank 7, and the inlet of flash distillation tower 13 is connected through flash distillation feed pump 11 to the liquid outlet of clear water storage tank 9.
Further, an oilfield water purification apparatus further includes a clean water reinjection pump 10; the liquid outlet of the clear water storage tank 9 is also connected with the liquid inlet of the clear water reinjection pump 10. Specifically, clear water storage tank 9 sets up the inlet of tank bottom liquid play liquid sharing mouth, and the top adds the radar level gauge, reduces the heat preservation of geothermal energy loss outward.
Clear water treated by the three-phase separator 1 and the centrifugal machine 5 directly flows into the clear water collecting tank 7, an immersed pump is arranged in the clear water collecting tank 7, and the clear water is pumped into the clear water storage tank 9 through the immersed pump. The outlet of the clean water storage tank 9 is connected with a clean water reinjection pump 10 and a flash evaporation liquid inlet pump 11, one part of clean water is reinjected by the clean water reinjection pump 10, and the other part of clean water enters a flash evaporation tower 13 from the flash evaporation liquid inlet pump 11 to become soft water. The clear water obtained after being treated by the centrifugal machine 5 can meet certain reinjection requirements, namely, the scale forming substances in the pipeline can be ensured not to be increased any more, so that part of clear water is not required to be treated into soft water, and the soft water is directly reinjected, so that the cost of oilfield water treatment can be reduced.
Further, an oilfield water purification apparatus also includes a flash heater 12. The liquid outlet of the flash evaporation liquid inlet pump 11 is connected with the liquid inlet of the flash evaporation heater 12, and the liquid outlet of the flash evaporation heater 12 is connected with the liquid inlet of the flash evaporation tower 13.
Specifically, referring to fig. 3, the flash heater 12 is an explosion-proof electric heater, and is automatically controlled to be opened when the clean water is insufficient in geothermal energy, and is automatically closed when the clean water is satisfied, so that the energy-saving design is realized. The oil field water is rich in geothermal energy, the temperature of some oil field water is above 90 ℃, and the oil well mouth is provided with crude oil heating equipment generally, so that clean water treated by the device is self-carrying heat energy, if the heat energy carried by the clean water is insufficient (lower than 60 ℃), the flash heater 12 is automatically started for heating, if the temperature of the clean water is above 60 ℃, the flash heater 12 is automatically closed, the clean water is not required to be heated all the day, and only the clean water is started when needed, so that energy sources can be saved, and the energy consumption is reduced.
Further, an oilfield water purification apparatus further comprises: soft water is discharged from the pump 17. The liquid outlet of the soft water temporary storage tank 18 is connected with the liquid inlet of the soft water liquid outlet pump 17.
The clear water in the clear water storage tank 9 and the soft water in the soft water temporary storage tank 18 are respectively output by the clear water reinjection pump 10 and the soft water liquid outlet pump 17 according to the proportion for oil displacement reinjection. In the conventional technology, clear water is mostly adopted for direct reinjection, although clear water is relatively clean after being treated, more scale forming substances are formed in the oil pipeline through long-term accumulation, the direct reinjection of clear water only can ensure that the scale forming substances in the pipeline are not increased any more, and the reinjection of clear water and soft water according to the proportion can remove the scale forming substances in the pipeline, so that the dredging of the oil pipeline is realized.
Further, an oilfield water purification apparatus further includes a vacuum circulation pump 16; the self-circulation liquid outlet inside the soft water temporary storage tank 18 is connected with the liquid inlet of the vacuum circulation pump 16, and the outlet of the vacuum circulation pump 16 is connected with the inlet of the vacuum ejector 15.
Specifically, the vacuum ejector 15, the vacuum circulating pump 16, the soft water outlet pump 17 and the soft water temporary storage tank 18 are integrated together to form a vacuum system, the length of a pipeline at the lower part of the vacuum ejector 15 is not less than 8m, and the pipeline penetrates into the soft water temporary storage tank 18 to be 10-20 cm below the liquid level; the soft water temporary storage tank 18 is internally provided with a baffle plate, and the liquid discharge and the self circulation are not mutually interfered; the vacuum system does not preserve heat, and the condensing effect is achieved by utilizing natural heat dissipation of the atmospheric environment; the soft water temporary storage tank 18 is provided with a blow-down of not less than 5 m.
Preferably, the oilfield water purification apparatus of the present embodiment is provided with a thermal insulation system for all equipment except for the vacuum ejector 15, the vacuum circulation pump 16, the soft water outlet pump 17 and the soft water temporary storage tank 18. Before entering the flash tower 13, the loss of geothermal energy of crude oil is reduced as much as possible, the energy utilization rate is improved, and the energy loss is reduced.
In general, the oilfield water purification device in this embodiment only needs the flash heater 12 to use a small amount of electric energy for auxiliary heating, uses a large amount of the abundant geothermal energy carried by crude oil, and uses the soft water in the soft water temporary storage tank 18 to manufacture a vacuum environment through the vacuum ejector 15 and the vacuum circulating pump 16 in a self-circulation manner, and the vacuum environment enables the water in the flash tower 13 to be severely evaporated at 60-80 ℃ to form a flash phenomenon at the internal filler interface.
The oilfield water purification device in the embodiment obtains clear water after treating oilfield water, flashes clear water in the flash tower 13 to obtain soft water and concentrated brine, returns the concentrated brine to the centrifugal machine 5 to serve as seed crystals, promotes sewage flocculation, can achieve good treatment effect without adding additional water treatment agents, and avoids a large amount of sludge caused by the water treatment agents. The clear water obtained by the centrifugal machine 5 is further processed into soft water through the flash tower 13, and the soft water and the clear water obtained by the centrifugal machine 5 are reinjected in proportion, so that a scale-blocked pipeline can be dredged; the geothermal energy of crude oil is utilized, and the energy consumption in the oilfield water treatment process is reduced. The cost of oil field water treatment is reduced, the oil field water treatment efficiency is improved, and scaling blockage caused by water reinjection is avoided.
Example two
Oilfield water impurities: suspended particles and colloids, comprising: silt, clay with the particle size of 0.05-4 mu m, silt with the particle size of 4-60 mu m and fine sand with the particle size of more than 60 mu m; various corrosion products and scale: fe (Fe) 2 O 3 、CaO、MgO、FeS、CaSO 4 、CaCO 3 、SrSO 4 Etc.; bacteria: sulfate Reducing Bacteria (SRB) 5-10 μm, saprophytic bacteria (TGB) 10-30 μm; organic matter: heavy oils such as gums, asphaltenes, and paraffins. Dispersing oil, floating oil, emulsifying oil, ca dissolved in water 2+ 、Mg 2+ 、K + 、Na + 、Fe 2+ 、Cl - 、CO 3 2- Inorganic salts, naphthenic acids and other organic solvents; dissolved oxygen, carbon dioxide, hydrogen sulfide, hydrocarbon and other gases enter the three-phase separator 1 together with crude oil extraction, are separated by density under the combined actions of rotary centrifugation, gravity sedimentation, coalescence separation and ultrasonic vibration, and a small amount of oil gas is discharged from the upper part along with the oil phase and enters oil field oil collecting equipment. Sediment sewage is deposited at the lower part and is discharged by the liquid level control. The old oil well is usually under insufficient pressure, so the bottom blowdown is provided with auxiliary power by the abrasion-resistant sewage collection pump 2, and the pipeline is selected from the ball valve, so that the clamping is avoided.
The sewage containing the sludge is pumped into a sewage storage tank 3 by a sewage collecting pump 2, and the bottom is fed with liquid. The jet flow impacts the bottom sedimentation layer, so that the interior of the sewage storage tank 3 is uniform as much as possible, hard scale accumulation is avoided, and static electricity is dissipated. The top of the sewage storage tank 3 is provided with a radar liquid level meter, and the overflow prevention and the evacuation prevention of the liquid level are monitored.
The centrifugal liquid inlet pump 4 pumps the materials of the sewage storage tank 3 into the centrifugal machine 5, three phases of oil, water and mud are separated through high-speed centrifugation, and the three phases enter the petroleum collection tank 6, the clear water collection tank 7 and the solid waste treatment device 8 respectively in a natural fall without resistance. The oil collection tank 6 is provided with a immersed pump for recirculating the oil back to the three-phase separator 1, so as to ensure that the oil does not run out. The solid matters in the solid waste treatment device 8 are collected and transported outwards in a unified way. Because the oil sludge contains a large amount of oilfield primary bacteria, the oil sludge can be fully decomposed after being concentrated and enriched by centrifugation and naturally piled up, and gradually becomes soil, and enters a biosphere for circulation for a long time. Incineration treatment can also be adopted to form ash, and the ash enters the geological evolution process in the form of minerals.
The immersed pump in the clear water collecting tank 7 automatically pumps clear water into the clear water storage tank 9, and liquid is fed and discharged from the bottom of the immersed pump, so that the liquid in the clear water storage tank 9 can be balanced and uniformly mixed. One part of liquid in the clean water storage tank 9 is used for oil displacement reinjection by the clean water reinjection pump 10 and soft water in the soft water temporary storage tank 18 in proportion, and the other part of liquid enters the flash tower 13 by the flash evaporation feed pump 11 through the flash evaporation heater 12. The oilfield water is rich in geothermal heat, the temperature of some oilfield water is above 90 ℃, and a crude oil heating device is usually arranged at the oil wellhead. Under the vacuum environment manufactured by the vacuum ejector 15 and the vacuum circulating pump 16, the water in the flash tower 13 is evaporated vigorously at 60-80 ℃ to form a flash evaporation phenomenon at the interface of the internal filler. The water vapor enters a soft water temporary storage tank 18 through a vacuum ejector 15 to form soft water, and is pumped out by a soft water outlet pump 17, and the clean water storage tank 9 can be mixed for reinjection according to a proportion or qualified discharging. The concentrated brine is used as seed crystal, returns to the sewage storage tank 3 by the brine reflux pump 14, enters the centrifugal machine 5 through the centrifugal liquid inlet pump 4 to promote flocculation, and enhances the effect of the centrifugal machine 5. When the geothermal energy is insufficient, the flash heater 12 can be started to heat the clear water entering the flash tower 13, and the thermal energy is properly supplemented.
The whole set of device is characterized in that oil field water is input from a three-phase separator 1, oil and dissolved gas are output from the three-phase separator 1, oil sludge is output from a centrifugal machine 5 through a solid waste treatment device 8, clear water is output from the centrifugal machine 5 through a clear water reinjection pump 10, and soft water is output from a flash tower 13 through a soft water liquid outlet pump 17. Clear water and soft water can be injected back in proportion by oil displacement.
The clear water in the clear water storage tank 9 and the soft water in the soft water temporary storage tank 18 are respectively output by the clear water reinjection pump 10 and the soft water liquid outlet pump 17 according to the proportion for oil displacement reinjection. In the conventional technology, clear water is mostly adopted for direct reinjection, although clear water is relatively clean after being treated, more scale forming substances are formed in the oil pipeline through long-term accumulation, the direct reinjection of clear water only can ensure that the scale forming substances in the pipeline are not increased any more, and the reinjection of clear water and soft water according to the proportion can remove the scale forming substances in the pipeline, so that the dredging of the oil pipeline is realized.
Results of three-phase separator 1 effluent detection: chemical oxygen demand 6.82×10 4 mg/L, turbidity 9, petroleum 17.8mg/L, total dissolved solids 1.80×10 4 mg/L; soft water outlet pump 17 outlet liquid detection result: chemical oxygen demand 170mg/L, turbidity 1, petroleum 0.48mg/L, and total dissolved solids 264mg/L. The Q/SYXJ0030-2015 oil field injection water grading water quality index specifies that the ultra-low permeability water index is controlled to be less than or equal to 5mg/L of oil content, and the detection meets the requirements.
The oilfield water purification device in the embodiment obtains clear water after treating oilfield water, and then flashes clear water to obtain soft water and concentrated brine, and returns the concentrated brine to the centrifugal machine 5 to serve as seed crystals, so that a good treatment effect can be achieved without adding additional water treatment agent, and a large amount of sludge caused by the water treatment agent is avoided. The clear water is further processed into soft water through the flash tower 13, and the soft water and the clear water are injected back in proportion, so that the pipeline with blocked scale can be dredged; the geothermal energy of crude oil is utilized, and the energy consumption in the oilfield water treatment process is reduced. The oilfield water purification device in the embodiment avoids the ground biochemical degradation after the high-temperature oilfield water is cooled in the conventional technology, and the oilfield water in the device is concentrated and enriched into the sludge rich in a large amount of protozoon bacteria by centrifugation, and is naturally stacked, decomposed or incinerated to enter the geological evolution process. The oilfield water after the oilfield water purification device in this embodiment handles accords with the detection condition, and oilfield water treatment cost is low, has improved oilfield water treatment efficiency, has avoided the scale deposit jam that water reinjection produced.
The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.
Claims (10)
1. An oilfield water purification apparatus, comprising:
a three-phase separator (1), a centrifuge (5), a flash tower (13), a vacuum ejector (15) and a soft water temporary storage tank (18);
the liquid outlet of the three-phase separator (1) is connected with the liquid inlet of the centrifugal machine (5);
the water outlet of the centrifugal machine (5) is connected with the liquid inlet of the flash tower (13);
the liquid phase outlet of the tower kettle of the flash tower (13) is connected with the liquid inlet of the centrifugal machine (5);
the top gas phase outlet of the flash tower (13) is connected with the soft water temporary storage tank (18) through the vacuum ejector (15).
2. An oilfield water purification apparatus as defined in claim 1, further comprising: a sewage collecting pump (2), a sewage storage tank (3) and a centrifugal liquid inlet pump (4);
the liquid outlet of the three-phase separator (1) is connected with the liquid inlet of the centrifugal machine (5) through the sewage collecting pump (2), the sewage storage tank (3) and the centrifugal liquid inlet pump (4);
the liquid outlet of the three-phase separator (1) is connected with the liquid inlet of the sewage collecting pump (2);
the liquid outlet of the sewage collecting pump (2) is connected with the liquid inlet of the sewage storage tank (3);
the liquid outlet of the sewage storage tank (3) is connected with the liquid inlet of the centrifugal liquid inlet pump (4);
the liquid outlet of the centrifugal liquid inlet pump (4) is connected with the liquid inlet of the centrifugal machine (5) 。
3. An oilfield water purification apparatus as defined in claim 2, further comprising: a brine reflux pump (14); the flash tower (13) is connected with a liquid inlet of the centrifugal machine (5) through the brine reflux pump (14), the sewage storage tank (3) and the centrifugal liquid inlet pump (4);
the liquid phase outlet of the tower kettle of the flash tower (13) is connected with the liquid inlet of the brine reflux pump (14);
the liquid outlet of the brine reflux pump (14) is connected with the liquid inlet of the sewage storage tank (3).
4. An oilfield water purification apparatus as defined in claim 1, further comprising: a petroleum collection tank (6), a clear water collection tank (7) and a solid waste treatment device (8);
an oil outlet of the centrifugal machine (5) is connected with an oil inlet of the petroleum collection tank (6);
the water outlet of the centrifugal machine (5) is connected with the liquid inlet of the flash evaporation tower (13) through the clear water collecting tank (7);
the solid waste outlet of the centrifugal machine (5) is connected with the solid waste treatment device (8).
5. An oilfield water purification apparatus according to claim 4, wherein the oil outlet of the oil collection tank (6) is connected to the inlet of the three-phase separator (1).
6. The oilfield water purification apparatus of claim 4, further comprising: a clear water storage tank (9) and a flash evaporation liquid inlet pump (11);
the clear water collection tank (7) is connected with a liquid inlet of the flash evaporation tower (13) through the clear water storage tank (9) and the flash evaporation liquid inlet pump (11);
the liquid outlet of the clean water collecting tank (7) is connected with the liquid inlet of the clean water storage tank (9);
the liquid outlet of the clear water storage tank (9) is connected with the liquid inlet of the flash evaporation tower (13) through the flash evaporation liquid inlet pump (11).
7. An oilfield water purification apparatus of claim 6, further comprising a clean water reinjection pump (10); the liquid outlet of the clean water storage tank (9) is also connected with the liquid inlet of the clean water reinjection pump (10).
8. An oilfield water purification apparatus of claim 6, further comprising a flash heater (12);
a liquid outlet of the flash evaporation liquid inlet pump (11) is connected with a liquid inlet of the flash evaporation heater (12);
the liquid outlet of the flash evaporation heater (12) is connected with the liquid inlet of the flash evaporation tower (13).
9. An oilfield water purification apparatus as defined in claim 1, further comprising: a soft water outlet pump (17);
the liquid outlet of the soft water temporary storage tank (18) is connected with the liquid inlet of the soft water liquid outlet pump (17).
10. An oilfield water purification apparatus of claim 9, further comprising a vacuum circulation pump (16);
the soft water temporary storage tank (18) is connected with a liquid inlet of the vacuum circulating pump (16);
the outlet of the vacuum circulating pump (16) is connected with the inlet of the vacuum ejector (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321619532.4U CN219929882U (en) | 2023-06-25 | 2023-06-25 | Oilfield water purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321619532.4U CN219929882U (en) | 2023-06-25 | 2023-06-25 | Oilfield water purification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219929882U true CN219929882U (en) | 2023-10-31 |
Family
ID=88488437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321619532.4U Active CN219929882U (en) | 2023-06-25 | 2023-06-25 | Oilfield water purification device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219929882U (en) |
-
2023
- 2023-06-25 CN CN202321619532.4U patent/CN219929882U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105174657B (en) | The processing unit and method of a kind of oil extraction waste water | |
| CN100431654C (en) | Pre-treating process for sewage from thick oil refining | |
| CN106007209B (en) | A kind of oil refinery's sewage oil removing pretreating process | |
| CN101397180B (en) | Technique for centralized processing and comprehensive utilization of drilling wastes | |
| CN101244879B (en) | Oil-containing oil emulsion waste water treatment process | |
| CN105293804A (en) | Coal gasification ash water treatment method | |
| CN107082506A (en) | A kind of processing method of oil field extracted water and technological process | |
| CN105399271A (en) | Device and method for recycling petroleum and phenol from oilfield industry wastewater and treating and regenerating wastewater | |
| CN103739137B (en) | The harmless treatment recovery method of oilfield sump oil and device | |
| CN103313943A (en) | Method for recovering gas from shale reservoirs and purifying resulting produced water | |
| CN102267734A (en) | Enclosed circulating air floatation method and apparatus | |
| CN107216912A (en) | A kind of oil field emulsifies Method for treatment of oil and processing unit always | |
| CN108911332A (en) | A method of draining centralized processing and comprehensive utilization are steeped for oil gas field gas production | |
| CN100486920C (en) | Gas field methanol sewage disposal process | |
| CN206089292U (en) | Oil field oil extraction wastewater treatment device | |
| CN219929882U (en) | Oilfield water purification device | |
| CN206590995U (en) | A kind of processing unit of oil field extracted water | |
| CN104609601A (en) | Treatment method for quickly clarifying oilfield produced water through micro-sand circulation | |
| CN108975600B (en) | Ground comprehensive treatment platform for thickened oil sewage | |
| CN108640334B (en) | Three-section efficient composite treatment system and treatment process for oily sewage | |
| CN205235584U (en) | High -efficient whirl deoiling device | |
| CN208345922U (en) | Three sections of high efficiency composition processing systems of oily wastewater | |
| CN205840846U (en) | Drilling mud does not land processing means | |
| CN211226687U (en) | Treatment system for oily wastewater | |
| CN104528988A (en) | Gas field oil-containing alcohol-containing sewage pretreatment system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |