A modeling method for deep well injection treatment of high-salinity water technology

Abstract

The invention discloses a modeling method for deep well injection treatment of high-salt water technology, which belongs to the field of high-salt water treatment technology and aims to solve the shortcomings of existing high-salt water treatment processes, including multi-effect evaporation, electrodialysis, and reverse osmosis, which have large equipment investment, high treatment costs, and poor economic efficiency. The method comprises the following steps: S1, setting up a high-salt water collection tank to integrate the high-salt water required for deep well injection, and then sampling and analyzing the concentration of the high-salt water in the collection tank. If the high-salt water concentration is lower than 0.9%, it is used; if the concentration is higher than 0.9%, further analysis is required. The analysis content includes the ratio of Cl-, SO42-, Na+, Ca, sulfide, chloride ion, and organic phosphorus content; S2, treating the high-salt water with target parameters at high concentrations and establishing a treatment system. The treatment system includes a sedimentation tank, a primary quartz sand filter, a secondary quartz sand filter, a scale inhibitor, and a brackish water membrane processor.

Description

Technical Field

[0001] The invention belongs to the technical field of high-salinity water treatment, and specifically relates to a modeling method for deep well injection treatment of high-salinity water technology. Background Art

[0002] Deep well injection is a method of discharging waste liquids by injecting liquid waste into permeable underground rock formations through deep wells under a certain pressure. These deep wells are often oil and gas production wells that are several thousand meters deep and have thick impermeable layers on the upper part. In this way, the original oil and gas-bearing rock formations can be used as storage wastewater. High-salt wastewater refers to wastewater with a total salt content of at least 1%. It mainly comes from chemical plants and the collection and processing of oil and natural gas. This wastewater contains a variety of substances (including salt, oil, organic heavy metals and radioactive substances). Salt wastewater is produced in a wide range of ways, and the amount of water is increasing year by year. It is crucial to remove the impact of organic pollutants in salty wastewater on the environment.

[0003] Currently, commonly used high-salt water treatment processes include multi-effect evaporation, electrodialysis, and reverse osmosis. These treatment processes have disadvantages such as large equipment investment, high treatment costs, and poor economic efficiency.

[0004] Therefore, how to quickly and efficiently treat high-salinity water is an urgent problem that needs to be solved. The inventors proposed a deep well injection technology modeling method for treating high-salinity water to meet the usage requirements. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] In view of the shortcomings of the existing technology, the purpose of the invention is to provide a modeling method for deep well injection treatment of high-salt water technology, aiming to solve the shortcomings of existing high-salt water treatment processes including multi-effect evaporation, electrodialysis and reverse osmosis, which have large equipment investment, high treatment costs and poor economy.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the invention provides a modeling method for deep well injection treatment of high-salt water technology, comprising the following steps:

[0009] S1. Set up a high-salt water collection tank to integrate the high-salt water required for deep well injection. Then sample and analyze the concentration of the high-salt water in the collection tank. If the concentration of the high-salt water is lower than 0.9%, it can be used. If the concentration is higher than 0.9%, further analysis is required. The analysis content includes the content ratio of Cl-, SO42-, Na+, Ca, sulfide, chloride ion and organic phosphorus.

[0010] S2. Treat the high-salt water with the target parameters at a high concentration and establish a treatment system, which includes a sedimentation tank, a primary quartz sand filter, a secondary quartz sand filter, a scale inhibitor, and a brackish water membrane processor. The primary quartz sand filter, the secondary quartz sand filter, the scale inhibitor, and the brackish water membrane processor are connected by a pumping device, and the water inlet and the outlet are installed in series in sequence;

[0011] S3, the sedimentation tank is provided with an upper inclined area and a lower inclined area, wherein a transition area is provided between the upper inclined area and the lower inclined area, and the upper inclined area, the lower inclined area and the transition area are separated by an isolation plate;

[0012] S4. After the high-salt water is filtered in the primary quartz sand filter, it enters the secondary quartz sand filter. After the secondary quartz sand filter, the high-salt water is introduced into the storage container again for data analysis, and the analysis records are compared with the previous ones. The high-salt water is then sent to the scale inhibitor for treatment;

[0013] S5. After being treated by the scale inhibitor, the high-salt water is in a state that is not easy to scale. It is then sent to the brackish water membrane processor to separate the salt ions and treat the high-salt water to a state that meets the use standards. The treated high-salt water is then used for deep well injection operations.

[0014] Preferably, a control valve is installed between the water pumping devices, which automatically adjusts the water flow according to the pumping volume requirements. For example, in a sedimentation tank, in order not to destroy the sediment below the sedimentation tank, the control valve will automatically reduce the pumping volume during the sedimentation tank process, so that the high-salt water is in a slow-flowing state.

[0015] Preferably, in S1, if the concentration of suspended matter in the high salt water is higher than 18 mg / L, the high salt water is passed through a chloride-type anion exchange resin so that the concentration of suspended matter in the high salt water is less than 3 mg / L.

[0016] Preferably, a sewage discharge structure is provided at the bottom of the sedimentation tank. After the high-salt water in the sedimentation tank is discharged, the remaining sediment in the sedimentation tank is processed. After the sewage discharge structure is opened, the sediment is gradually pumped out of the sedimentation tank from the bottom of the sedimentation tank. At this time, a large amount of high-salt water that has not been discharged before will be mixed in. A centrifugal separator is also connected to the sewage discharge mechanism.

[0017] Preferably, in S3, the high-salt water first enters the upper inclined area for precipitation. After the precipitation time is reached, the isolation plate slowly descends in height, and the surface water of the upper inclined area first flows toward the transition area. When the water levels of the two areas are almost flush, the isolation plate slowly rises to separate the upper inclined area and the transition area.

[0018] Preferably, the high-salt water is detected again in the transition zone and the corresponding data is extracted. Then the isolation plate between the transition zone and the downward-inclined zone is lowered, and the lowest horizontal surface of the transition zone is higher than the highest horizontal surface of the downward-inclined zone. Then the high-salt water flows directly into the downward-inclined zone for precipitation. After the precipitation is completed, the high-salt water inside the downward-inclined zone is directly pumped into the primary quartz sand filter.

[0019] Preferably, after being pumped out, the sewage will directly enter the centrifugal separator to separate the brine from the sediment again. The separated brine will enter the primary quartz sand filter for subsequent treatment as before, while the separated sediment will be cleaned up uniformly.

[0020] Preferably, hydrochloric acid solution or sodium chloride solution is added to the high salt water to transform the anion exchange resin into a chloride-type anion exchange resin. The high salt water passes through the chloride-type anion exchange resin to obtain effluent with a lower sulfate concentration, which then enters the sedimentation tank.

[0021] (3) Beneficial effects

[0022] Compared with the existing technology, the beneficial effects of the invention are: building a more targeted treatment platform to desalinate high-salt water, so that during use, the pollution to the environment is reduced, the energy consumption of the treatment process is low, and at the same time, the pollution caused by the treatment equipment itself during the treatment of high-salt water can be effectively reduced. There is no need to consume a large amount of energy required for evaporating water by existing technologies. The treatment effect is good, the equipment economic cost is low, and the use requirements are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of the invention;

[0025] Figure 2 It is a schematic block diagram of the processing system structure;

[0026] Figure 3 This is a schematic diagram of the sewage discharge process of the sedimentation tank;

[0027] Figure 4 This is a schematic diagram of the sedimentation tank working process. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] This specific embodiment is a deep well injection treatment of high-salt water technology modeling method, and its structural diagram is as follows Figure 1-Figure 4 As shown, the following steps are included:

[0030] S1. Set up a high-salt water collection tank to integrate the high-salt water required for deep well injection. Then sample and analyze the concentration of the high-salt water in the collection tank. If the concentration of the high-salt water is lower than 0.9%, it can be used. If the concentration is higher than 0.9%, further analysis is required. The analysis content includes the content ratio of Cl-, SO42-, Na+, Ca, sulfide, chloride ion and organic phosphorus.

[0031] S2. Treat the high-salt water with the target parameters at a high concentration and establish a treatment system, which includes a sedimentation tank, a primary quartz sand filter, a secondary quartz sand filter, a scale inhibitor, and a brackish water membrane processor. The primary quartz sand filter, the secondary quartz sand filter, the scale inhibitor, and the brackish water membrane processor are connected by a pumping device, and the water inlet and the outlet are installed in series in sequence;

[0032] S3, the sedimentation tank is provided with an upper inclined area and a lower inclined area, wherein a transition area is provided between the upper inclined area and the lower inclined area, and the upper inclined area, the lower inclined area and the transition area are separated by an isolation plate;

[0033] S4. After the high-salt water is filtered in the primary quartz sand filter, it enters the secondary quartz sand filter. After the secondary quartz sand filter, the high-salt water is introduced into the storage container again for data analysis, and the analysis records are compared with the previous ones. The high-salt water is then sent to the scale inhibitor for treatment;

[0034] S5. After being treated by the scale inhibitor, the high-salt water is in a state that is not easy to scale. It is then sent to the brackish water membrane processor to separate the salt ions and treat the high-salt water to a state that meets the use standards. The treated high-salt water is then used for deep well injection operations.

[0035] Control valves are installed between the pumping devices. The control valves will automatically adjust the water flow according to the pumping and discharge requirements. For example, in the sedimentation tank, in order not to destroy the sediment below the sedimentation tank, the control valve will automatically reduce the pumping and discharge volume during the sedimentation tank process, so that the high-salt water is in a slow-flowing state.

[0036] In S1, if the suspended solids concentration in the high-salt water exceeds 18 mg / L, the high-salt water passes through a chloride-type anion exchange resin to reduce the suspended solids concentration in the high-salt water to less than 3 mg / L. Hydrochloric acid solution or sodium chloride solution is added to the high-salt water to transform the anion exchange resin into a chloride-type anion exchange resin. The high-salt water passes through the chloride-type anion exchange resin to obtain effluent with a lower sulfate concentration, which then enters the sedimentation tank.

[0037] A sewage discharge structure is installed at the bottom of the sedimentation tank. After the high-salt water in the sedimentation tank is discharged, the remaining sediment in the sedimentation tank is processed. After the sewage discharge structure is opened, the sediment is gradually pumped out from the bottom of the sedimentation tank. At this time, a large amount of high-salt water that has not been discharged previously will be mixed in. A centrifugal separator is also connected to the sewage discharge mechanism. After being pumped out, the sewage will directly enter the centrifugal separator, which will further separate the high-salt water from the sediment. The separated high-salt water will enter the primary quartz sand filter for subsequent treatment as before, while the separated sediment will be cleaned up uniformly.

[0038] In S3, the high-salt water first enters the upper-sloping zone for precipitation. After the precipitation time is reached, the isolation plate slowly descends, and the surface water in the upper-sloping zone flows first toward the transition zone. When the water levels in the two zones are nearly level, the isolation plate slowly rises, separating the upper and transition zones. The high-salt water is again tested in the transition zone, and the corresponding data is extracted. The isolation plate between the transition zone and the lower-sloping zone then descends, raising the transition zone's lowest level above the lower zone's highest level. The high-salt water then flows directly into the lower-sloping zone for precipitation. Once precipitation is complete, the high-salt water within the lower-sloping zone is pumped directly into the primary quartz sand filter.

[0039] All technical features in this embodiment can be freely combined according to actual needs.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the invention and is not intended to limit the invention. Although the invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the scope of protection of the invention.

Claims

1. A modeling method for deep well injection treatment of high-salt water technology, characterized in that: The following steps are involved: S1. Set up a high-salt water collection tank to integrate the high-salt water required for deep well injection. Then sample and analyze the concentration of the high-salt water in the collection tank. If the concentration of the high-salt water is lower than 0.9%, it can be used. If the concentration is higher than 0.9%, further analysis is required. The analysis content includes the content ratio of Cl-, SO42-, Na+, Ca, sulfide, chloride ion and organic phosphorus. S2. Treat the high-salt water with the target parameters at a high concentration and establish a treatment system, which includes a sedimentation tank, a primary quartz sand filter, a secondary quartz sand filter, a scale inhibitor, and a brackish water membrane processor. The primary quartz sand filter, the secondary quartz sand filter, the scale inhibitor, and the brackish water membrane processor are connected by a pumping device, and the water inlet and the outlet are installed in series in sequence; S3, the sedimentation tank is provided with an upper inclined area and a lower inclined area, wherein a transition area is provided between the upper inclined area and the lower inclined area, and the upper inclined area, the lower inclined area and the transition area are separated by an isolation plate; S4. After the high-salt water is filtered in the primary quartz sand filter, it enters the secondary quartz sand filter. After the secondary quartz sand filter, the high-salt water is introduced into the storage container again for data analysis, and the analysis records are compared with the previous ones. The high-salt water is then sent to the scale inhibitor for treatment; S5. After being treated by the scale inhibitor, the high-salt water is in a state that is not easy to scale. It is then sent to the brackish water membrane processor to separate the salt ions and treat the high-salt water to a state that meets the use standards. The treated high-salt water is then used for deep well injection operations.

2. The modeling method for deep well injection treatment of high-salt water technology according to claim 1 is characterized in that: Control valves are installed between the pumping devices. The control valves will automatically adjust the water flow according to the pumping and discharge requirements. For example, in the sedimentation tank, in order not to destroy the sediment below the sedimentation tank, the control valve will automatically reduce the pumping and discharge volume during the sedimentation tank process, so that the high-salt water is in a slow-flowing state.

3. The modeling method for deep well injection treatment of high-salt water technology according to claim 1 is characterized in that: In S1, if the concentration of suspended matter in the high salt water is higher than 18 mg / L, the high salt water passes through a chloride-type anion exchange resin to reduce the concentration of suspended matter in the high salt water to less than 3 mg / L.

4. The modeling method for deep well injection treatment of high-salt water technology according to claim 1 is characterized in that: A sewage discharge structure is provided at the bottom of the sedimentation tank. After the high-salt water in the sedimentation tank is discharged, the remaining sediment in the sedimentation tank is processed. After the sewage discharge structure is opened, the sediment is gradually pumped out of the sedimentation tank from the bottom of the sedimentation tank. At this time, a large amount of high-salt water that has not been discharged before will be mixed in. A centrifugal separator is also connected to the sewage discharge mechanism.

5. The modeling method for deep well injection treatment of high-salt water technology according to claim 1 is characterized in that: In S3, the high-salt water first enters the upper inclined area for precipitation. After the precipitation time is reached, the isolation plate slowly descends in height, and the surface water in the upper inclined area first flows toward the transition area. When the water levels in the two areas are almost flush, the isolation plate slowly rises to separate the upper inclined area and the transition area.

6. A modeling method for deep well injection treatment of high-salt water technology according to claim 5, characterized in that: The high-salt water is tested again in the transition zone and the corresponding data is extracted. Then the isolation plate between the transition zone and the downward-inclined zone is lowered, and the lowest level of the transition zone is higher than the highest level of the downward-inclined zone. Then the high-salt water flows directly into the downward-inclined zone for precipitation. After precipitation is completed, the high-salt water inside the downward-inclined zone is directly pumped into the primary quartz sand filter.

7. The modeling method for deep well injection treatment of high-salt water technology according to claim 4 is characterized in that: After being pumped out, the sewage will directly enter the centrifuge to separate the high-salt water from the sediment again. The separated high-salt water will enter the primary quartz sand filter for subsequent treatment as before, and the separated sediment will be cleaned up uniformly.

8. The modeling method for deep well injection treatment of high-salt water technology according to claim 3 is characterized in that: Add hydrochloric acid solution or sodium chloride solution to the high brine to transform the anion exchange resin into a chloride-type anion exchange resin. The high brine passes through the chloride-type anion exchange resin to obtain effluent with a lower sulfate concentration, which then enters the sedimentation tank.

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