CN212451034U - Natural gas production water treatment system - Google Patents
Natural gas production water treatment system Download PDFInfo
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- CN212451034U CN212451034U CN202021863603.1U CN202021863603U CN212451034U CN 212451034 U CN212451034 U CN 212451034U CN 202021863603 U CN202021863603 U CN 202021863603U CN 212451034 U CN212451034 U CN 212451034U
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Abstract
The utility model discloses a water treatment system for natural gas produced water, relating to the technical field of water treatment of oil and gas fields; comprises a buffer tank, an electrolysis device, an evaporation device and a reverse osmosis device which are arranged in sequence; the reverse osmosis device is provided with a water inlet and a concentrated solution outlet; the buffer tank is provided with a first liquid inlet; a backflow pipeline is arranged between the reverse osmosis device and the first liquid inlet; the evaporation device is provided with a water outlet pipeline communicated with the water inlet, and the water outlet pipeline is provided with a first water quality monitoring device and a bypass pipeline communicated with the water outlet pipeline. The utility model discloses a natural gas produced water treatment system has guaranteed water treatment system's play water quality of water stable, has reduced because the undulant great influence to water treatment system's play water quality of water of produced water quality of water.
Description
Technical Field
The utility model relates to an oil gas field water treatment technical field, in particular to natural gas production water treatment system.
Background
The natural gas produced water generally adopts reinjection measures, so that the pollution of the surface caused by the discharge is reduced, and the formation water quantity is supplemented to promote the formation oil gas to escape. However, the natural gas produced water is complex in water quality and mainly comprises water, oil, suspended matters, scale forming components such as calcium and magnesium existing in the produced water in an ion form, bacteria, various agents (such as foaming agents) added in the oil extraction process, a large amount of chloride ions and the like, the oil content is high, the mineralization degree is high, the content of suspended matters is high, the produced water can be seriously polluted due to direct reinjection, and meanwhile, the produced water is limited by the reinjection amount of a single well, so the produced water can be reinjected after being treated.
Patent CN105000745A discloses a sour gas field produced water processing system, adopts stripper, hydrogen sulfide blow-off device, air desulfurizing tower, pre-evaporator, ammonia nitrogen blow-off device, multi-effect evaporator, electrolysis catalytic oxidation device and crystallizer to retrieve most of the material in the sour gas field produced water to can be with the distilled water retrieval and utilization after the multiple-effect evaporation of the distilled water after blow-off. However, the fluctuation of the quality of the produced water of natural gas is large, the fluctuation of the quality of the produced water is frequent, and the problem that the quality of the produced water passing through the water treatment system is unstable and the quality of the reinjection water is difficult to ensure is often ignored by the existing water treatment system.
SUMMERY OF THE UTILITY MODEL
The application aims to solve the problem that the quality of outlet water of a water treatment system is unstable due to unstable quality of produced water of natural gas in the prior art, and provides a natural gas produced water treatment system with stable quality of outlet water.
In order to realize the purpose of the utility model, the application provides the following technical scheme: a water treatment system for natural gas produced water comprises a buffer tank, an electrolysis device, an evaporation device and a reverse osmosis device which are arranged in sequence; the reverse osmosis device is provided with a water inlet and a concentrated solution outlet; the buffer tank is provided with a first liquid inlet; a backflow pipeline is arranged between the reverse osmosis device and the first liquid inlet; the evaporation device is provided with a water outlet pipeline communicated with the water inlet, the water outlet pipeline is provided with a first water quality monitoring device, and the water outlet pipeline is also communicated with a bypass pipeline.
In the technical scheme, the water outlet of the evaporation device is provided with the water outlet pipeline provided with the bypass pipeline communicated with the water outlet pipeline, and the water outlet pipeline is connected with the reverse osmosis device, when the water quality fluctuation of the produced water is large, so that the quality of the water outlet quality of the evaporation device cannot reach the reinjection water or domestic water standard, the reverse osmosis device is used for reverse osmosis treatment, and reverse osmosis concentrated solution obtained by reverse osmosis concentration flows back to the water treatment system for water treatment again, so that the water outlet of the whole water treatment system is less influenced by the quality fluctuation of the produced water, and the water quality stability of the water outlet is maintained. Meanwhile, the water treatment system disclosed by the application makes full use of the fact that the content of chloride ions in the produced water of natural gas is high, and a chlorine-containing agent is not required to be added additionally, the electrolytic device can be used for removing ammonia nitrogen and COD in the produced water, and particularly for the produced water with high chlorine content (the content of chloride ions is more than or equal to 3%), the electric conductivity is high, the voltage required by the electrolytic device is low, the energy consumption is low, and good economic benefits and application values are achieved; meanwhile, the electrolysis device can remove ammonia nitrogen and COD in the produced water simultaneously, and has the advantages of small occupied area, simple equipment and short process flow.
Furthermore, the electrolysis device is communicated with the evaporation device through a connecting pipeline, and a second water quality monitoring device and a first regulating valve are arranged on the connecting pipeline. The second water quality monitoring device is used for detecting the contents of nitrogen, COD (chemical oxygen demand) and the like in the produced water subjected to electrolytic deamination and denitrification, and adjusting the hydraulic retention time of the produced water in the electrolytic device through the first regulating valve, so that the quality of the produced water of the electrolytic device is kept in a certain range, the stability of the quality of the produced water of the water treatment system is improved, the water treatment pressure of the evaporation device and the reverse osmosis device is reduced, the flow rate of backflow water is reduced, and the water treatment efficiency of the produced water is improved.
Further, the system also comprises a clarifying tank and a physical scale preventer; the clarifying tank is communicated with a first liquid inlet of the buffer tank; the buffer tank is provided with a first liquid outlet; the electrolysis device is provided with a second liquid inlet, and the physical scale preventer is arranged between the first liquid inlet and the second liquid inlet and is communicated with the first liquid inlet and the second liquid inlet, so that the scales of the electrolysis device, the evaporation device, the reverse osmosis device and a drainage pipeline arranged between the electrolysis device and the evaporation device are reduced, and the service life of the equipment is prolonged.
Furthermore, the physical scale preventer is a copper-based catalyst scale preventer, achieves good scale prevention and removal effects, and has the advantages of long service life, low cost and good scale prevention effect. Meanwhile, the copper-based catalyst antiscaling device is directly connected with the electrolysis device, and free electrons generated by the copper-based catalyst antiscaling device enter the electrolysis device along with produced water, so that the content of the free electrons in the electrolysis device is increased, and the effect of removing ammonia nitrogen and COD through electrolytic oxidation is improved.
Further, the clarifying tank is connected with a dosing device for adding a softening agent into the clarifying tank.
Further, the electrolysis device comprises an electrolysis bath and a retention cell which are communicated with each other; a negative plate and an anode plate which are externally connected with a power supply are arranged in the electrolytic tank; the buffer tank is communicated with the electrolytic cell; the retention tank is provided with a second water outlet and a gas outlet, and the electrolytic tank is provided with a second liquid inlet; the second liquid inlet is communicated with the buffer tank; the second water outlet is communicated with the evaporation device. Under the electrolysis action of the electrified negative plate and the electrified positive plate, chloride ions in the produced water are electrolyzed to generate chlorine with strong oxidability, and the chlorine reacts with ammonia nitrogen in the produced water to remove the ammonia nitrogen and COD; then enters a staying pool to be reacted completely, and the generated nitrogen is discharged through a gas outlet.
Furthermore, the current output by the power supply externally connected with the cathode plate and the anode plate is adjustable, and is used for adjusting the current of the electrolysis device, further adjusting the electrolysis efficiency of the electrolysis device for electrolyzing the produced water, and reducing the influence of the quality fluctuation of the produced water on the quality of the produced water.
Compared with the prior art, the utility model discloses a following beneficial effect has:
the application discloses a natural gas produced water treatment system, which realizes that the effluent which does not reach the reinjection water and/or finished water standard flows back into the water treatment system again by arranging a return pipeline, ensures the stability of the effluent quality of the water treatment system, and reduces the influence on the effluent quality of the water treatment system due to the larger fluctuation of the produced water quality; meanwhile, the ammonia nitrogen and COD in the produced water are removed by the electrolysis device, and the produced water is treated by combining the evaporation device and the reverse osmosis device, so that process equipment such as a deamination tower, Fenton advanced oxidation and an inorganic microfiltration membrane skid block in a conventional produced water treatment system is omitted, the use of condensate is reduced, and the addition of a medicament and the yield of sludge are reduced; meanwhile, the internal circulating water quantity of the evaporation device is reduced, and the treatment efficiency of the water evaporation device is improved. In addition, the water treatment system disclosed in the document is also provided with a copper-based catalyst antiscaling device between the buffer tank and the electrolysis device, and the antiscaling and descaling of the water treatment system are realized through the copper-based catalyst antiscaling device; meanwhile, the copper-based catalyst antiscaling device is arranged at the upstream of the electrolysis device, so that the produced water has free electrons before entering the electrolysis device, the electrolysis efficiency is improved, the electrolysis cost is reduced, and the effects of removing ammonia nitrogen and COD by electricity are achieved; in addition, the water treatment system disclosed in the application is also provided with a clarifying tank in front of the buffer tank, so that produced water is clarified and softened, mineral substances in the produced water are reduced, and good anti-scaling and descaling effects are achieved by combining the anti-scaling and descaling performances of the copper-based catalyst antiscaling device.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a natural gas produced water treatment system disclosed by the utility model;
FIG. 2 is a flow chart of the natural gas produced water treatment system of the present invention during water treatment;
in the figure, 1-a clarifying tank, 2-a buffer tank, 3-a copper-based catalyst antiscaling device, 4-an electrolysis device, 41-an electrolysis tank, 42-a retention tank, 5-an evaporation device, 6-a reverse osmosis device, 7-a reflux pipeline, 8-a water outlet pipeline and 9-a bypass pipeline.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
The utility model discloses a water treatment system for natural gas produced water, which is shown in figure 1 and comprises a buffer tank 2, an electrolysis device 4, an evaporation device 5 and a reverse osmosis device 6 which are arranged in sequence; the reverse osmosis device 6 is provided with a water inlet and a concentrated solution outlet; the buffer tank 2 is provided with a first liquid inlet; a return pipeline 7 is arranged between the reverse osmosis device 6 and the first liquid inlet; the evaporation device 5 is provided with a water outlet pipeline 8 communicated with the water inlet, and the water outlet pipeline 8 is provided with a first water quality monitoring device and a bypass pipeline 9 communicated with the water outlet pipeline 8.
In some embodiments, the buffer tank 2 comprises a buffer tank 2 body and a first liquid inlet, a second water outlet and a sludge outlet which are arranged on the buffer tank 2 body, and the hydraulic retention time in the whole water treatment system is adjusted through the buffer tank 2; the lower end of the buffer tank 2 is provided with a sludge outlet for discharging sludge precipitated in the buffer tank 2, reducing the amount of sludge flowing in the whole water treatment system, and reducing the amount of sludge of produced water in the electrolysis device 4, the evaporation device 5 and the reverse osmosis device 6 and scaling of pipelines.
The electrolysis device 4 comprises an electrolysis bath 41 and a retention cell 42; a cathode plate and an anode plate are arranged in the electrolytic bath 41, and the anode plate and the cathode plate are externally connected with a power supply; the electrolytic bath 41 and the retention cell 42 are in communication with each other. The retention tank 42 is provided with a second water outlet and a second air outlet, and the electrolytic bath 41 is provided with a second liquid inlet; the produced water from the buffer tank 2 enters an electrolytic tank 41 from a second liquid inlet, under the electrolysis action of the electrified negative plate and the electrified positive plate, chloride ions in the produced water are electrolyzed to generate chlorine with strong oxidability, and the chlorine reacts with ammonia nitrogen in the produced water to remove the ammonia nitrogen and COD; then enters the retention tank 42 to completely react, and the generated nitrogen is discharged through a gas outlet.
In some embodiments, the electrolytic cell 41 is not provided with an air outlet, and the retention tank 42 is provided with an air outlet, so that chlorine generated by electrolysis does not escape from the electrolytic cell 41 but fully reacts with ammonia nitrogen, and then enters the retention tank 42 to fully react with ammonia nitrogen in produced water, so as to remove ammonia nitrogen and COD in the produced water.
The evaporator 5 is a commercially available multi-effect evaporator, preferably an MVR evaporator.
The reverse osmosis device 6 is a commercially available reverse osmosis device 6. In a specific embodiment of the present application, a Reverse Osmosis (RO) unit manufactured by glantt corporation is used.
The first water quality monitoring device is a detection device capable of monitoring the ammonia nitrogen content and the COD content in water, and can adopt a commercially available water quality monitor. The bypass pipeline 9 is communicated with the water outlet pipeline 8, and a switch valve is arranged at the communication position of the bypass pipeline 9 and the water outlet pipeline 8 and used for controlling water to flow out of the water outlet pipeline 8 or the bypass pipeline 9.
In the process of treating the desulfurized produced water, the desulfurized produced water enters the buffer tank 2 for buffer adjustment and enters the electrolysis device 4 for electro-stripping of ammonia nitrogen and COD; the electrolyzed produced water enters an evaporation device 5 for evaporation, the obtained evaporation liquid enters a water outlet pipeline 8, and whether the evaporation liquid can reach the water quality standard of finished water or not can be known through a first water quality detection device on the water outlet pipeline 8; when the water quality of the evaporated liquid can reach the water quality of the finished product water, the evaporated liquid can flow out of the bypass pipeline 9 and then be recycled; when the water quality of the evaporated liquid can not reach the water quality of the finished product water, the evaporated liquid enters the reverse osmosis device 6 from the water outlet pipeline 8 and is subjected to reverse osmosis treatment to obtain outlet water which can reach the water quality standard of the finished product water; the mother liquor obtained by reverse osmosis flows back to the buffer tank 2 through the return pipeline 7, and water treatment is carried out again, so that the quality of the effluent of the whole water treatment system is stable.
In some embodiments, the electrolysis device 4 is communicated with the evaporation device 2 through a connecting pipeline, and a second water quality monitoring device and a first regulating valve are arranged on the connecting pipeline. One end of the connecting pipeline is connected with the second water outlet, and the other end of the connecting pipeline is connected with the evaporation device 2. the first regulating valve is used for regulating the water outlet flow speed and the water outlet time of the electrolysis device 4, so as to regulate the hydraulic retention time of the produced water in the electrolysis device 4, so that the ammonia nitrogen and COD removing effect in the produced water is better, the water quality of the produced water of the electrolysis device 4 is still stable in a certain range under the condition of meeting the fluctuation of the water quality of the produced water, the water treatment pressure in the evaporation device 5 and the reverse osmosis device 6 is reduced, and the circulating water quantity in the water treatment system is reduced. The second water quality monitoring device is a detection device capable of monitoring the ammonia nitrogen content and the COD content in water, and can adopt a commercially available water quality monitor.
In some embodiments, a current adjusting circuit is disposed in a power circuit electrically connecting the cathode plate and the anode plate of the electrolysis device 4, and is used for adjusting the current of the electrolysis device 4, so as to adjust the electrolysis efficiency of the electrolysis device 4 for electrolyzing the produced water, and reduce the influence of the fluctuation of the quality of the produced water on the quality of the produced water. It should be noted that the current adjusting circuit may be implemented by using an adjustable resistor connected in series between the anode plate and the power supply, or may be implemented by using other circuits or electronic components that can adjust the current in the circuit.
In some embodiments, the system is further provided with a clarification tank communicated with the first liquid inlet of the buffer tank, and the clarification tank 1 is connected with a dosing device. The clarifying tank 1 comprises a clarifying tank body, a first water inlet, a first water outlet and a first dosing port, wherein the first water inlet and the first water outlet are arranged on the clarifying tank body, and the first dosing port is communicated with a dosing device; the first medicine adding port is used for adding a water treatment medicine, and the water treatment medicine is a softening medicine, preferably sodium hydroxide and sodium bicarbonate. The produced water after desulfurization enters the clarifying tank 1 from a first water inlet, and after a softening agent is added, the pH value of the produced water is adjusted to 11, and clarification and impurity removal are carried out; and then enters the buffer tank 2 from the first drain port.
In the process of treating the desulfurized produced water, the desulfurized produced water enters the clarifying tank 1 from a first water inlet of the clarifying tank 1, is softened, adjusted in pH value and clarified by sodium hydroxide and sodium bicarbonate added into the clarifying tank 1 to obtain the produced water with precipitated impurities, and then enters the buffer tank for buffer adjustment and the precipitated sludge is removed.
The buffer tank 2 is preferably adjusted in pH without adding a chemical. Because most of the generated precipitates in the softened produced water are dissolved under the acidic condition, the softening effect is reduced; secondly, in the electrolysis process of the electrolysis device 4, because a large amount of chlorine gas is generated in the electrolysis process, the pH value of the produced water is reduced, and sometimes a medicament is required to be added to keep the produced water in a certain alkalinity, the pH value is adjusted without adding the medicament in the buffer tank 2, the step of adding the medicament to the produced water in the electrolysis device 4 to adjust the pH value is omitted, and the using amount of the medicament is omitted.
In some embodiments, the buffer tank 2 is provided with a first liquid outlet; the electrolysis device 4 is provided with a second liquid inlet, and a physical scale preventer is arranged between the first liquid outlet and the second liquid inlet. After the agent for softening the produced water is added into the clarifying tank 1, the mineralization degree of the produced water is reduced, and the scaling conditions in pipelines among the buffer tank 2, the electrolysis device 4, the evaporation device 5, the reverse osmosis device 6 and the devices are reduced; however, in the buffer tank 2, the electrolysis device 4 and the evaporation device 5, salt with a large content still exists in the produced water, so that certain scaling condition still exists, the service life of the water treatment system is influenced, and the overhaul cost is increased. Therefore, a physical scale preventer is arranged between the buffer tank 2 and the electrolysis device 4, so that the scaling conditions in the electrolysis device 4 and the evaporation device 5 can be further reduced, the service life of the water treatment system is prolonged, and the overhaul cost is reduced.
Preferably, the physical scale inhibitor is a copper-based catalyst scale inhibitor 3. The copper-based catalyst scale preventer 3 adopts catalyst alloy to continuously release free electrons, reduces the concentration of cations in water, thereby reducing the scaling index, has good scale prevention effect, long service life, simple installation and no need of daily maintenance, and can greatly reduce the maintenance and overhaul of a water treatment system caused by scaling. Meanwhile, in the application document, the copper-based catalyst antiscaling device 3 is arranged at the upstream of the electrolysis device 4, because the copper-based catalyst antiscaling device 3 can release free electrons to the produced water, after the produced water enters the electrolysis device 4, because part of the free electrons exist in the produced water, the electrolysis efficiency of the electrolysis device 4 can be improved, and the effect of removing ammonia nitrogen and COD by electrolytic oxidation is further improved.
The application also discloses a natural gas produced water treatment process, referring to fig. 2, which specifically comprises the following steps:
s2, enabling the desulfurized produced water to enter the buffer tank, and performing buffer adjustment;
s3: the produced water from the buffer tank 2 enters the electrolysis device 4 for electrolysis, so that oxidizing substances generated by electrolysis react with ammonia nitrogen and COD in the produced water, and the ammonia nitrogen and the COD in the produced water are removed;
s4: the produced water after electro-removing ammonia nitrogen and COD enters the evaporation device 5 for evaporation and concentration;
s5: the evaporating liquid obtained by the evaporating device 5 is subjected to water quality monitoring when passing through the water outlet pipeline 8; when the water quality of the evaporated liquid can reach the water quality standard of the finished product water, the evaporated liquid flows out of the bypass pipeline 9; when the water quality of the evaporated liquid can not reach the water quality standard of the finished product water, the evaporated liquid enters the reverse osmosis device 6 for osmotic filtration, and reverse osmosis is carried out to obtain reverse osmosis concentrated liquid and reuse water respectively; and returning the reverse osmosis concentrated solution to the first liquid outlet of the buffer tank 2 through the return pipeline 7.
In the step S4, the mother liquor obtained by the evaporation device 5 may be reinjected into the formation as reinjection water; the salt slurry obtained by the evaporation device 5 can be crystallized and dried to obtain industrial salt for recycling; the evaporated liquid obtained by the evaporation device 5 can be directly recycled according to whether the water quality of the evaporated liquid reaches the water quality standard of the finished product water or recycled after being subjected to reverse osmosis treatment by the reverse osmosis device 6. Therefore, the water treatment process disclosed by the application can realize zero emission of the produced water when the produced water is treated.
In some embodiments, the current intensity in the electrolysis device 4 is 800-1500A, preferably 1000-1200A.
In some embodiments, the current intensity of the electrolysis device 4 is adjustable. And a second water quality monitoring device is arranged on a second water outlet of the electrolysis device 4 and is used for monitoring the effluent quality of the electrolysis device 4, and when the effluent quality of the electrolysis device 4 fluctuates obviously, the current intensity of the electrolysis device 4 is adjusted through a current adjusting circuit connected to the electrolysis device 4, so that the effluent quality of the electrolysis device 4 is stabilized within a certain range.
In some embodiments, the effluent quality of the electrolyzer 4 is judged by a COD index, which may be the following COD index: 600 mg/L-500 mg/L, 500 mg/L-400 mg/L, 400 mg/L-300 mg/L, 300 mg/L-200 mg/L. Namely, when the quality of the effluent of the electrolysis device 4 falls into the certain COD index range, the current of the electrolysis device 4 is adjusted to the corresponding current intensity, and then the COD content of the produced water entering the evaporation device 5 can be controlled.
In some embodiments, the hydraulic retention time of the produced water in the electrolysis device 4 is 30-45 min; and a first regulating valve is arranged at a second water outlet of the electrolysis device 4 and is used for regulating the hydraulic retention time of the produced water in the electrolysis device 4. When the quality of the effluent of the electrolysis device 4 fluctuates obviously, the quality of the effluent of the electrolysis device 4 is stabilized in a certain range by adjusting the hydraulic retention time of the produced water in the electrolysis device 4. The effluent quality of the electrolysis device 4 is monitored by a second water quality monitoring device, and in the implementation process, the effluent quality of the electrolysis device 4 can be subjected to index range determination, such as: the COD of the effluent is taken as the effluent quality index, and the COD of the effluent is divided into four grades which are respectively: 600 mg/L-500 mg/L, 500 mg/L-400 mg/L, 400 mg/L-300 mg/L, 300 mg/L-200 mg/L, when the water quality of the outlet water of the electrolysis device 4 falls into the certain COD index range, the hydraulic retention time of the electrolysis device 4 is adjusted to a corresponding value, and the COD content of the produced water entering the evaporation device 5 can be controlled.
In some embodiments, a physical scale preventer is arranged between the first liquid outlet and the second liquid inlet, so that the scale formation of the produced water in the water treatment system is further reduced, and the service life of the equipment is prolonged.
In some embodiments, the physical scale preventer is a copper-based catalyst scale preventer 3, and the produced water from the buffer tank 2 passes through the copper-based catalyst scale preventer 3 and enters the electrolysis device 4, so that the produced water enters the electrolysis device 4 with free electrons, the content of the free electrons in the electrolysis device 4 is increased, and the effect of removing ammonia nitrogen and COD by electrolytic oxidation is improved.
In some embodiments, step S2 is preceded by step S1: the desulfurized produced water enters the clarifying tank 1, and a softening agent is added into the clarifying tank 1 for clarification and softening to obtain softened produced water;
the COD content of the finished product water is less than or equal to 50mg/L, and the finished product water can be used for circulating condensed water, cooling water of public works, cooling water of pumps and the like.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides a natural gas production water processing system which characterized in that: comprises a buffer tank, an electrolysis device, an evaporation device and a reverse osmosis device which are arranged in sequence; the reverse osmosis device is provided with a water inlet and a concentrated solution outlet; the buffer tank is provided with a first liquid inlet; a backflow pipeline is arranged between the reverse osmosis device and the first liquid inlet; the evaporation device is provided with a water outlet pipeline communicated with the water inlet, the water outlet pipeline is provided with a first water quality monitoring device, and the water outlet pipeline is also communicated with a bypass pipeline.
2. The system for treating water produced from natural gas according to claim 1, wherein the electrolysis device is communicated with the evaporation device through a connecting pipeline, and a second water quality monitoring device and a first regulating valve are arranged on the connecting pipeline.
3. The natural gas produced water treatment system according to claim 1 or 2, further comprising a clarifier and a physical scale preventer; the clarifying tank is communicated with a first liquid inlet of the buffer tank; the buffer tank is provided with a first liquid outlet; the electrolysis device is provided with a second liquid inlet, and the physical scale preventer is arranged between the first liquid outlet and the second liquid inlet and is communicated with the first liquid outlet and the second liquid inlet.
4. The natural gas produced water treatment system of claim 3, wherein the physical scale inhibitor is a copper-based catalyst scale inhibitor.
5. The natural gas produced water treatment system according to claim 3, wherein the clarification tank is connected with a dosing device.
6. The natural gas production water treatment system according to any one of claims 1, 2, 4, and 5, wherein the electrolysis device comprises an electrolysis cell and a retention cell which are communicated with each other; a negative plate and an anode plate which are externally connected with a power supply are arranged in the electrolytic tank; the buffer tank is communicated with the electrolytic cell; the retention tank is provided with a second water outlet and a gas outlet, and the electrolytic tank is provided with a second liquid inlet; the second liquid inlet is communicated with the buffer tank; the second water outlet is communicated with the evaporation device.
7. The natural gas produced water treatment system according to claim 6, wherein the current output by the power supply externally connected to the cathode plate and the anode plate is adjustable.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057251A (en) * | 2021-11-01 | 2022-02-18 | 中广核达胜科技有限公司 | Treatment method of gas field wastewater |
| CN114105386A (en) * | 2020-08-31 | 2022-03-01 | 中国石油化工股份有限公司 | Natural gas produced water treatment system and water treatment process thereof |
| CN114180685A (en) * | 2021-07-07 | 2022-03-15 | 中国石油化工股份有限公司 | Electrolytic bacterial corrosion prevention system and method |
| CN116119847A (en) * | 2021-09-28 | 2023-05-16 | 中国石油化工股份有限公司 | Treatment process and treatment device system for gas field produced softened water |
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2020
- 2020-08-31 CN CN202021863603.1U patent/CN212451034U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105386A (en) * | 2020-08-31 | 2022-03-01 | 中国石油化工股份有限公司 | Natural gas produced water treatment system and water treatment process thereof |
| CN114105386B (en) * | 2020-08-31 | 2024-01-09 | 中国石油化工股份有限公司 | Natural gas produced water treatment system and water treatment process thereof |
| CN114180685A (en) * | 2021-07-07 | 2022-03-15 | 中国石油化工股份有限公司 | Electrolytic bacterial corrosion prevention system and method |
| CN116119847A (en) * | 2021-09-28 | 2023-05-16 | 中国石油化工股份有限公司 | Treatment process and treatment device system for gas field produced softened water |
| CN114057251A (en) * | 2021-11-01 | 2022-02-18 | 中广核达胜科技有限公司 | Treatment method of gas field wastewater |
| CN114057251B (en) * | 2021-11-01 | 2024-02-27 | 中广核达胜科技有限公司 | Treatment method of gas field wastewater |
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