CN114763285A - Nitrogen air-flotation produced water treatment process for ultra-low permeability oil field - Google Patents
Nitrogen air-flotation produced water treatment process for ultra-low permeability oil field Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 74
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- 230000018044 dehydration Effects 0.000 claims abstract description 29
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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Abstract
The invention discloses a nitrogen gas flotation produced water treatment process for an ultra-low permeability oilfield, which comprises a settling tank, a sludge pool, a sludge magnetic separation dehydration device, an adjusting water tank, an air flotation device, a pipeline mixer, a nitrogen power reactor, a settling tank, an ultrasonic filter, a purifying water tank and an additive tank, wherein the settling tank is respectively communicated with the sludge pool, the sludge magnetic separation dehydration device and the adjusting water tank, the sludge pool is communicated with the sludge magnetic separation dehydration device, and the sludge pool and the sludge magnetic separation dehydration device are communicated with the adjusting water tank. Has the advantages that: the treatment effect is excellent: the standard can be reached only by the first-stage air floatation treatment process, the average oil content of air floatation water is about 5mg/l, the suspended matter content is about 5mg/l, the oil removal efficiency is more than 96%, the suspended matter removal efficiency is more than 90%, the conventional operation of a filtering system can be stopped, and the water outlet index can reach 20-30% of the reinjection index of the Changqing oil field after the filtering system is started.
Description
Technical Field
The invention relates to the field of oilfield production, in particular to a nitrogen air floatation produced water treatment process for an ultra-low permeability oilfield.
Background
The Ordos basin belongs to a low-permeability and ultra-low permeability oil field. The produced water is characterized by high salinity, high salt content, high chloride ions, high iron content, belongs to high-corrosion and high-scaling water body in the produced water of the oil field, and has complex water quality. In order to keep the energy of oil reservoirs and the oil production speed, water injection development is still the main technical measure. The water quality of the produced water treatment system has a severe requirement on the water quality of the produced water due to extremely low permeability.
The domestic oilfield produced water treatment process is mainly a two-stage oil removal and two-stage filtration process or a one-stage oil removal and two-stage filtration process, and the following problems still commonly exist after years of operation: (1) the primary oil removal is not thorough; (2) the filtering system has large load, frequent backwashing and low processing precision; (3) the problem of serious corrosion of pipelines and equipment exists in low-permeability oil fields and ultra-low permeability oil fields; (4) the oxygen content exceeds the standard; (5) the SRB content exceeded.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a nitrogen air floatation produced water treatment process for an ultra-low permeability oilfield, which aims to overcome the technical problems in the prior related art.
Therefore, the invention adopts the following specific technical scheme:
according to one aspect of the invention, a nitrogen air floatation produced water treatment process for an ultra-low permeability oilfield is provided.
A nitrogen gas floatation produced water treatment process for a low permeability oilfield comprises a settling tank, a sludge pool, a sludge magnetic separation dehydration device, an adjusting water tank, an air floatation device, a pipeline mixer, a nitrogen power reactor, a sedimentation tank, an ultrasonic filter, a purification water tank and an additive tank, wherein the settling tank is respectively communicated with the sludge pool, the sludge magnetic separation dehydration device and the adjusting water tank, the sludge pool is communicated with the sludge magnetic separation dehydration device, the sludge pool and the sludge magnetic separation dehydration device are both communicated with the adjusting water tank, the adjusting water tank is communicated with the air floatation device, the additive tank is connected between the adjusting water tank and the air floatation device, the air floatation device is communicated with the pipeline mixer, the pipeline mixer is communicated with the nitrogen power reactor, the nitrogen power reactor is connected with the sedimentation tank, the sedimentation tank is connected with the ultrasonic filter, and the ultrasonic filter is connected with the water purification tank.
According to another aspect of the invention, a nitrogen air floatation produced water treatment process for an ultra-low permeability oilfield is provided, which comprises the following steps:
the method comprises the following steps: the gathering and transportation system leads the produced water of the oil field into a settling tank for settling separation, the separated sump oil is discharged into a regulating tank, the sludge is discharged into a sludge tank, and the rest components are discharged into a sludge magnetic separation dehydration device;
step two: sludge discharged into the sludge tank is precipitated and concentrated by gravity, and supernatant in the sludge tank is pressurized by a booster pump and then is introduced into a regulating water tank; the sludge in the middle and the bottom of the sludge tank is introduced into the magnetic sludge separation and dehydration device through a pipeline under the action of a sludge pump;
step three: the residual components flowing out of the settling tank enter a sludge magnetic separation dehydration device for oil removal and suspended matter removal treatment, the treated sludge is directly transported outwards or transported outwards after the moisture content is reduced by airing, and the treated dehydrated water enters a regulating water tank;
step four: adding a coagulant into a regulating water tank by an additive tank for regulating, mixing and stirring, then introducing the regulating oilfield produced water in the regulating water tank, a flotation agent, a flocculation agent and a coagulant aid into an air flotation device together, and performing first-stage oil removal treatment;
step five: introducing the oilfield produced water subjected to air floatation treatment into a pipeline mixer, introducing the oilfield produced water and the oilfield produced water in the pipeline mixer into a nitrogen power reactor by taking nitrogen as an air source, and performing secondary treatment of air floatation for removing oil and suspended matters;
step six: introducing the oilfield produced water subjected to air floatation for removing oil and suspended matters into a sedimentation tank for corrosion and scale inhibition treatment, introducing the oilfield produced water subjected to sedimentation treatment into an ultrasonic filter, and performing third-stage treatment of ultrasonic vibrator cleaning;
step seven: and (3) introducing the oilfield produced water subjected to ultrasonic filtration into a purification water tank, performing sterilization treatment, and introducing the mixture treated in the purification water tank into a reinjection system.
Further, in the sixth step, the ultrasonic filter adopts a sludge dewatering process of a sludge concentration tank and a horizontal screw centrifuge.
Furthermore, a CPVC full-plastic industrial pipeline system is selected between water treatment equipment as a water treatment process pipeline.
The beneficial effects of the invention are as follows: the treatment effect is excellent: only the first-stage air floatation treatment process reaches the standard, the average oil content of air floatation water is about 5mg/l, the suspended matter content is about 5mg/l, the oil removal efficiency is more than 96%, the suspended matter removal efficiency is more than 90%, the conventional operation of a filtering system can be stopped, and the water outlet index can reach 20-30% of the reinjection index of the Changqing oil field after the filtering system is started; the system has strong corrosion resistance: the water treatment equipment is designed by adopting a duplex stainless steel (the performance is superior to 316L stainless steel) material, and the process pipelines and valves adopt CPVC full-plastic industrial pipeline systems, so that the corrosion resistance is superior; the oxygen content percentage is low: the inert gas nitrogen is used as a gas source, so that good bacteriostasis is performed on aerobic bacteria such as iron bacteria, saprophytic bacteria and the like in the system, the oxygen percentage in the water body is reduced, and the problem of oxygen-containing corrosion of equipment and pipelines is greatly reduced; the sludge water volume reduction effect is obvious: by adopting the sludge dewatering process of the sludge thickener and the horizontal screw centrifuge, the water content of the sludge is about 80 percent, the volume of the sludge water is reduced by about 95 percent, and the subsequent hauling treatment cost is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow diagram of a nitrogen gas floatation produced water treatment process for an ultra-low permeability oilfield according to an embodiment of the invention;
FIG. 2 is a small curve flow chart of a nitrogen gas floatation produced water treatment process for an ultra-low permeability oilfield according to an embodiment of the invention.
In the figure:
1. a gathering and transportation system; 2. a settling tank; 3. a sludge tank; 4. a sludge magnetic separation dehydration device; 5. adjusting the water tank; 6. an air floatation device; 7. a pipeline mixer; 8. a nitrogen powered reactor; 9. a sedimentation tank; 10. an ultrasonic filter; 11. a purified water tank; 12. a reinjection system; 13. an additive tank.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the invention, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.
According to the embodiment of the invention, a nitrogen air floatation produced water treatment process for an ultra-low permeability oilfield is provided.
Example one
A nitrogen gas floatation produced water treatment process for a low permeability oilfield comprises a settling tank 2, a sludge tank 3, a sludge magnetic separation dehydration device 4, an adjusting water tank 5, an air floatation device 6, a pipeline mixer 7, a nitrogen power reactor 8, a settling tank 9, an ultrasonic filter 10, a purification water tank 11 and an additive box 13, wherein the settling tank 2 is respectively communicated with the sludge tank 3, the sludge magnetic separation dehydration device 4 and the adjusting water tank 5, the sludge tank 3 is communicated with the sludge magnetic separation dehydration device 4, both the sludge tank 3 and the sludge magnetic separation dehydration device 4 are communicated with the adjusting water tank 5, the adjusting water tank 5 is communicated with the air floatation device 6, the additive box 13 is connected between the adjusting water tank 5 and the air floatation device 6, the air floatation device 6 is communicated with the pipeline mixer 7, the pipeline mixer 7 is connected with the nitrogen power reactor 8, the nitrogen power reactor 8 is connected with the sedimentation tank 9, the sedimentation tank 9 is connected with the ultrasonic filter 10, and the ultrasonic filter 10 is connected with the water purification tank 11.
Example two
A nitrogen air-flotation produced water treatment process for an ultra-low permeability oilfield comprises the following steps:
the method comprises the following steps: the gathering and transportation system 1 leads the produced water of the oil field into a settling tank 2 for settling separation, the separated dirty oil is discharged into a regulating water tank 5, the sludge is discharged into a sludge pool 3, and the rest components are discharged into a sludge magnetic separation dehydration device 4;
step two: sludge discharged into the sludge tank 3 is concentrated by gravity sedimentation, and supernatant in the sludge tank 3 is pressurized by a booster pump and then is introduced into the regulating water tank 5; the sludge in the middle and the bottom of the sludge tank 3 is introduced into the sludge magnetic separation dehydration device 4 through a pipeline under the action of a sludge pump;
step three: the residual components flowing out of the settling tank 2 enter a sludge magnetic separation dehydration device 4 for oil removal and suspended matter removal treatment, the treated sludge is directly transported outwards or transported outwards after the moisture content is reduced by airing, and the treated dehydrated water enters a regulating water tank 5;
step four: the additive tank 13 adds coagulant into the regulating water tank 5 for regulation, mixing and stirring, and then introduces the produced water of the regulating oil field in the regulating water tank 5, the flotation agent, the flocculation agent and the coagulant aid into the air flotation device 6 for first-stage oil removal treatment;
step five: introducing the oilfield produced water subjected to air floatation treatment into a pipeline mixer 7, introducing nitrogen serving as an air source and the oilfield produced water in the pipeline mixer 7 into a nitrogen power reactor 8 together, and performing secondary treatment of air floatation for removing oil and suspended matters;
step six: introducing the oilfield produced water subjected to air flotation oil removal and suspended matter removal into a sedimentation tank 9 for corrosion inhibition and scale inhibition treatment, and introducing the oilfield produced water subjected to sedimentation treatment into an ultrasonic filter 10 for third-stage treatment through ultrasonic vibrator cleaning;
step seven: the oilfield produced water after being filtered by ultrasonic waves is led into a purified water tank 11 for sterilization treatment, and the mixture treated in the purified water tank 11 is led into a reinjection system 12.
EXAMPLE III
In the sixth step, the ultrasonic filter 20 adopts a sludge dewatering process of a sludge concentration tank and a horizontal screw centrifuge, and a CPVC full-plastic industrial pipeline system is selected as a water treatment process pipeline between water treatment equipment.
For convenience of understanding the above technical solution of the present invention, the following detailed description is made on the flow of the above technical solution of the present invention with reference to the accompanying drawings, and specifically, the following description is made:
according to the embodiment of the invention, the invention also provides a nitrogen air floatation produced water treatment process for the ultra-low permeability oilfield.
As shown in figure 1, in the actual production process, the nitrogen air flotation produced water treatment process for the ultra-low permeability oilfield comprises the following steps:
s101, the gathering and transportation system 1 feeds the oilfield produced water into a settling tank 2 for settling separation, the separated dirty oil is discharged into a regulating water tank 5, the sludge is discharged into a sludge pool 3, and the rest components are discharged into a sludge magnetic separation dehydration device 4;
step S103, sludge discharged into the sludge tank 3 is concentrated through gravity sedimentation, and supernatant in the sludge tank 3 is pressurized by a booster pump and then is introduced into the regulating water tank 5; the sludge in the middle and the bottom of the sludge tank 3 is introduced into the sludge magnetic separation dehydration device 4 through a pipeline under the action of a sludge pump;
s105, the residual components flowing out of the settling tank 2 enter a sludge magnetic separation dehydration device 4 for oil removal and suspended matter removal treatment, the treated sludge is directly transported outwards or transported outwards after being aired to reduce the water content, and the treated dehydrated water enters a regulating water tank 5;
step S107, adding a coagulant into the regulating water tank 5 by the additive tank 13 for regulating, mixing and stirring, then introducing the regulating oilfield produced water in the regulating water tank 5, the flotation agent, the flocculation agent and the coagulant aid into the air flotation device 6 together for primary oil removal treatment;
step S109, introducing the oilfield produced water subjected to air floatation treatment into a pipeline mixer 7, introducing the oilfield produced water and the oilfield produced water in the pipeline mixer 7 into a nitrogen power reactor 8 by taking nitrogen as an air source, and performing secondary treatment of air floatation for removing oil and suspended matters;
step S111, introducing the oilfield produced water subjected to air floatation for removing oil and suspended matters into a sedimentation tank 9 for corrosion inhibition and scale inhibition treatment, introducing the oilfield produced water subjected to sedimentation treatment into an ultrasonic filter 10, and performing third-stage treatment of ultrasonic vibrator cleaning;
step S113, introducing the oilfield produced water subjected to ultrasonic filtration into the purified water tank 11, performing sterilization treatment, and introducing the mixture treated in the purified water tank 11 into the reinjection system 12.
In one embodiment, in step six, the ultrasonic filter 20 adopts a sludge dewatering process of "sludge thickener + horizontal decanter centrifuge".
In one embodiment, CPVC full-plastic industrial piping system is selected as a water treatment process pipeline between water treatment equipment.
In summary, with the above technical solution of the present invention, the treatment effect of the treatment process is excellent: only the first-stage air floatation treatment process reaches the standard, the average oil content of air floatation water is about 5mg/l, the suspended matter content is about 5mg/l, the oil removal efficiency is more than 96%, the suspended matter removal efficiency is more than 90%, the conventional operation of a filtering system can be stopped, and the water outlet index can reach 20-30% of the reinjection index of the Changqing oil field after the filtering system is started; the system has strong corrosion resistance: the water treatment equipment is designed by adopting a duplex stainless steel (the performance is superior to 316L stainless steel) material, and the process pipelines and valves adopt CPVC full-plastic industrial pipeline systems, so that the corrosion resistance is superior; the oxygen content percentage is low: the inert gas nitrogen is used as a gas source, so that good bacteriostasis is performed on aerobic bacteria such as iron bacteria, saprophytic bacteria and the like in the system, the oxygen percentage in the water body is reduced, and the problem of oxygen-containing corrosion of equipment and pipelines is greatly reduced; the sludge water volume reduction effect is obvious: by adopting the sludge dewatering process of the sludge thickener and the horizontal screw centrifuge, the water content of the sludge is about 80 percent, the volume of the sludge water is reduced by about 95 percent, and the subsequent hauling treatment cost is greatly reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (4)
1. The nitrogen air-flotation produced water treatment process for the ultra-low permeability oilfield is characterized by comprising a settling tank (2), a sludge tank (3), a sludge magnetic separation dehydration device (4), an adjusting water tank (5), an air-flotation device (6), a pipeline mixer (7), a nitrogen power reactor (8), a settling tank (9), an ultrasonic filter (10), a purification water tank (11) and an additive box (13), wherein the settling tank (2) is respectively communicated with the sludge tank (3), the sludge magnetic separation dehydration device (4) and the adjusting water tank (5), the sludge tank (3) is communicated with the sludge magnetic separation dehydration device (4), the sludge tank (3) and the sludge magnetic separation dehydration device (4) are communicated with the adjusting water tank (5), the adjusting water tank (5) is communicated with the air-flotation device (6), adjusting water pitcher (5) with be connected with between air supporting device (6) additive case (13), air supporting device (6) with pipeline mixer (7) are connected and are link up, pipeline mixer (7) with nitrogen power reactor (8) are connected and are link up, nitrogen power reactor (8) with sedimentation tank (9) are connected and are link up, sedimentation tank (9) with ultrasonic filter (10) are connected and are link up, ultrasonic filter (10) with water purification pitcher (11) are connected and are link up.
2. A nitrogen air-flotation produced water treatment process for an ultra-low permeability oilfield is characterized by comprising the following steps:
the method comprises the following steps: the gathering and transportation system (1) leads the oilfield produced water into a settling tank (2) for settling separation, the separated dirty oil is discharged into a regulating water tank (5), the sludge is discharged into a sludge pool (3), and the rest components are discharged into a sludge magnetic separation dehydration device (4);
step two: the sludge discharged into the sludge tank (3) is precipitated and concentrated by gravity, and supernatant in the sludge tank (3) is pressurized by a booster pump and then is introduced into a regulating water tank (5); the sludge in the middle and the bottom of the sludge tank (3) is introduced into a sludge magnetic separation dehydration device (4) through a pipeline under the action of a sludge pump;
step three: residual components flowing out of the settling tank (2) enter a sludge magnetic separation dehydration device (4) for oil removal and suspended matter removal treatment, the treated sludge is directly transported outwards or transported outwards after being aired to reduce the water content, and the treated dehydrated water enters a regulating water tank (5);
step four: the additive tank (13) adds coagulant into the regulating water tank (5) for regulation, mixing and stirring, and then introduces the regulated oilfield produced water in the regulating water tank (5) together with flotation agent, flocculation agent and coagulant aid into the air flotation device (6) for first-stage oil removal treatment;
step five: introducing the oilfield produced water subjected to air floatation treatment into a pipeline mixer (7), introducing nitrogen serving as a gas source and the oilfield produced water in the pipeline mixer (7) into a nitrogen power reactor (8) together, and performing secondary treatment of air floatation for removing oil and suspended matters;
step six: introducing the oilfield produced water subjected to air flotation oil removal and suspended matter removal into a sedimentation tank (9), performing corrosion inhibition and scale inhibition treatment, introducing the oilfield produced water subjected to sedimentation treatment into an ultrasonic filter (10), and performing third-stage treatment of ultrasonic vibrator cleaning;
step seven: the oilfield produced water after being filtered by ultrasonic waves is led into a purified water tank (11) for sterilization treatment, and the mixture treated in the purified water tank (11) is led into a reinjection system (12).
3. The nitrogen gas floatation produced water treatment process for the ultra-low permeability oilfield according to claim 1, wherein in the sixth step, the ultrasonic filter (20) adopts a sludge dewatering process of a sludge concentration tank and a horizontal screw centrifuge.
4. The nitrogen air flotation produced water treatment process for the ultra-low permeability oilfield according to claim 1, wherein a CPVC full plastic industrial pipeline system is selected between water treatment equipment as a water treatment process pipeline.
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