CN110921765A - Method for reducing viscosity of oilfield produced water and simultaneously sterilizing - Google Patents
Method for reducing viscosity of oilfield produced water and simultaneously sterilizing Download PDFInfo
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- CN110921765A CN110921765A CN201911014503.3A CN201911014503A CN110921765A CN 110921765 A CN110921765 A CN 110921765A CN 201911014503 A CN201911014503 A CN 201911014503A CN 110921765 A CN110921765 A CN 110921765A
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/305—Treatment of water, waste water, or sewage by irradiation with electrons
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/307—Treatment of water, waste water, or sewage by irradiation with X-rays or gamma radiation
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Abstract
The invention discloses a method for reducing the viscosity of oilfield produced water and simultaneously sterilizing, belonging to the technical field of environmental protection. Specifically, the method comprises the steps of treating the oilfield produced water by ionizing radiation or treating the oilfield produced water by ionizing radiation and hydrogen peroxide in a combined manner, so that the viscosity of the oilfield produced water can be reduced and the oilfield produced water can be sterilized at the same time; wherein the ionizing radiation comprises high energy electron beams and gamma rays. The method is simple, convenient, efficient and good in safety, does not increase the ion concentration and salinity of the oilfield produced water, and does not generate secondary pollutants such as sludge and the like.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for reducing the viscosity of oilfield produced water and simultaneously sterilizing the oilfield produced water.
Background
Petroleum, known as "industrial blood", is an important energy and chemical raw material. The improvement of the crude oil exploitation amount of the existing oil field has important significance for reducing the import of external crude oil in China and ensuring the national energy safety.
Oilfield produced water is sewage generated along with the oil production operation. At present, most oil fields in China enter the middle and later periods of exploitation, the primary oil recovery and the secondary oil recovery are transited to the tertiary oil recovery stage, and the produced water quantity is increased year by year. In tertiary oil recovery technology, polymer flooding and ternary complex flooding are most widely applied to generate a large amount of polymer-containing sewage and ternary sewage. The polymer flooding is to add high molecular polymers such as polyacrylamide and the like into water to increase the viscosity and viscoelasticity of a polymer preparation system, improve the fluidity ratio, and increase the swept area of a flooding system, thereby increasing the recovery rate of crude oil. The ternary sewage is also called ternary composite flooding sewage, and is a method for increasing the crude oil recovery rate by adding an alkaline agent (A), a surfactant (S) and a polymer (P) into injected water to compound the three as an oil displacement agent. Meanwhile, petroleum drilling and production fracturing construction operations produce a large amount of fracturing flow-back wastewater, which is collectively referred to as oilfield produced water.
The concentration of crude oil and suspended matters in the produced water of the oil field is usually removed by adopting a coagulation sedimentation and filtration process, and the produced water is reused as stratum oil recovery reinjection water after being sterilized. The method can save fresh water resources and reduce environmental pollution, and the produced water has high temperature and good compatibility with stratum, thereby being beneficial to oil displacement. However, the produced water of the oil field contains polymers with higher concentration, and the high-concentration polymers increase the viscosity of the produced water, improve the emulsification degree, make the oil-water separation difficult, obviously reduce the treatment effect of the sedimentation filtration process, and make the effluent difficult to meet the reinjection water quality standard. At present, the most studied polymer viscosity reduction technologies include chemical methods such as Fenton oxidation, ultrasonic wave, demulsification by adding chemical agents and viscosity reduction, and biological methods. The oil field produced water has high oil content, complex components and extremely strong biological resistance of polyacrylamide, and is difficult to biodegrade. Most of the existing chemical methods need to add chemical agents, so that the cost is high, the ion concentration and salinity of the oilfield produced water are further increased, and the quality of the reinjection water is influenced. Ultrasonic treatment is not ideal in viscosity reduction effect, and Liu Xin Liang and the like (Liu Xin Liang, Irish, Yi Hai Liang, Diang, Yan Ling, Yang Jian, research on ultrasonic degradation of polymer-containing sewage in oil field, industrial water treatment 34(3) (2014)71-74) adopts ultrasonic treatment to overcome the polymer-containing sewage in oil field (the viscosity is 2.49 mPa.s). Under the conditions of 20 ℃ of temperature, 300W of microwave power, 45kHz of ultrasonic frequency and 60min of ultrasonic treatment, the viscosity of the sewage is reduced to 1.47mPa.s, which is much higher than that of pure water (1.01mPa.s) at the same temperature.
In addition, the sterilization of the produced water of the oil field is also an important step for meeting the reinjection requirement. Microorganisms such as sulfate reducing bacteria, saprophytic bacteria and iron bacteria in the produced water in the oil field can seriously corrode drilling and production equipment and a reinjection water treatment pipeline, block the pipeline and damage an oil layer. Therefore, the produced water in the oil field must be sterilized before being reinjected to the underground. The currently adopted method is to add various bactericides such as sodium hypochlorite, quaternary ammonium salt and the like, and to sterilize by ultraviolet rays and the like. The cost of the bactericide is high, and when the bactericide is used together with the oil displacing polymer, the viscosity stability of the reinjection water is influenced, and the salt content of the reinjection water is increased. The penetration capacity of ultraviolet rays is weak, and substances such as oil and the like in the produced water absorb the ultraviolet rays to influence the sterilization effect.
The viscosity reduction and sterilization of the oil field produced water treated by ultraviolet rays are respectively researched. Liu German Jun et al (Liu German Jun, Shen Long Yu, Liu Yufeng, the application of ultraviolet-frequency conversion technology combined sterilization in oil field water treatment, water treatment technology 33(4) (2007)46-49) researches the treatment effect of combining ultraviolet and frequency conversion electromagnetic waves on oil field produced water. The number of sulfate reducing bacteria is 103When the number of sulfate reducing bacteria per mL is reduced to 10 per mL, the sulfate reducing bacteria can still be detected. Furthermore, the authors state that in order to ensure the germicidal effect of the ultraviolet device, the oil content and turbidity of the oilfield produced water prior to sterilization must be strictly controlled. Wei super and the like (Wei super, Weili, Zhao Yun Fang, Li Chun Ying, Weidong, Liupu, ultraviolet technology is applied to the research of the rapid viscosity reduction of polymer-containing produced water in the oil field, and the environmental science and management 42(7) (2017)69-73) researches the viscosity reduction effect of ultraviolet on polymer-containing sewage in the oil field, and the viscosity of the sewage is reduced from 2.902 mPa.S to 1.096 mPa.S after 30min treatment. The study does not mention the experimental temperature and cannot be sure whether the viscosity has dropped to be consistent with that of pure water at the same temperature.
In summary, viscosity reduction and sterilization are necessary means for treating the produced water of the oil field to meet the requirement of reinjection, and at present, the viscosity reduction and sterilization are usually treated by different technologies, so that the consumption of the agent is high, the cost is high, the salt content of the produced water of the oil field is increased, and the quality of the reinjection water is influenced. There is an urgent need in the art for a method that is effective in reducing the viscosity of oilfield produced water while at the same time providing efficient sterilization.
Disclosure of Invention
The invention aims to provide a method for reducing the viscosity of oilfield produced water and simultaneously sterilizing, which has the following specific technical scheme:
a method for reducing the viscosity of the produced water of an oil field and simultaneously sterilizing comprises the steps of treating the produced water of the oil field by ionizing radiation or treating the produced water of the oil field by combining ionizing radiation and hydrogen peroxide, namely reducing the viscosity of the produced water of the oil field and simultaneously sterilizing.
The specific operation of treating the oilfield produced water by combining ionizing irradiation and hydrogen peroxide is as follows: adding hydrogen peroxide into the produced water of the oil field, and then carrying out ionizing irradiation treatment.
The concentration of the hydrogen peroxide is more than or equal to 10mmol/L, and the dosage of the hydrogen peroxide is more than or equal to 1.1mL/L of the oilfield produced water. Preferably, the concentration of the hydrogen peroxide is 20-100 mmol/L, and the dosage of the hydrogen peroxide is 2.2-11 mL/L of oilfield produced water.
The oilfield produced water refers to oily sewage which is produced along with oil production operation and is subjected to crude oil dehydration and separation, and the oily sewage comprises one or more of polymer-containing sewage, ternary sewage and fracturing flowback liquid sewage. The polymer-containing sewage is sewage generated by polymer flooding, the ternary sewage is sewage generated by ternary complex flooding, and the fracturing flow-back liquid sewage is well-flushing wastewater generated by petroleum drilling and fracturing construction operation.
The ionizing radiation of the present invention is a radiation that ionizes the affected substance, and includes high-energy electron beams or gamma rays. The ionizing radiation of the present invention is accomplished using devices or equipment known in the art.
Wherein the high-energy electron beam is generated by an electron accelerator or the like, and the gamma ray is generated by a radioactive isotope Co60Or Cs137Decay occurs.
The absorption dose of the ionizing radiation is more than or equal to 1 kGy; preferably, the absorbed dose of the ionizing radiation is 2.5-10 kGy.
The specific operation of treating the oilfield produced water by ionizing radiation comprises the following steps: and placing the oilfield produced water near a scanning target window of a high-energy electron beam or a gamma ray source to carry out ionizing radiation treatment.
The sterilization includes killing sulfate reducing bacteria, iron bacteria and saprophytic bacteria.
The ionizing radiation of the present invention may be carried out at any suitable temperature. In some embodiments, ionizing irradiation is performed at ambient conditions.
The invention has the beneficial effects that:
(1) the invention utilizes high-energy electron beams or gamma rays with high energy and strong penetrating power to treat the oilfield produced water, and hydroxyl free radicals OH and hydrated electrons e generated after water molecules are radiated by high energy through the direct action of the high-energy rays and polymersaq -The indirect action of the reaction of the active particles and the polymer realizes the degradation of the polymer in the water and the reduction of the viscosity of the oilfield produced water.
(2) The high-energy rays generated by ionizing radiation can directly act on DNA and other biological macromolecules to cause ionization and excitation of the biological macromolecules so as to cause microbial cell death; simultaneously, OH and e generated by water molecule irradiation decompositionaq -The active particles damage DNA, RNA and cell tissues of microorganisms through oxidation-reduction; thereby realizing the purpose of sterilization and disinfection.
(3) The invention combines hydrogen peroxide and ionizing irradiation technology to treat the oilfield produced water, can obviously improve the concentration of active particles such as OH and the like, strengthens the degradation and sterilization effects of polymers, and improves the viscosity reduction and sterilization efficiency; and the hydrogen peroxide decomposition product is water and oxygen, so that the ion concentration and the salt content of the oilfield produced water cannot be increased.
(4) The invention has the following advantages by utilizing the ionizing irradiation technology to treat the oilfield produced water: 1) the method is usually carried out at normal temperature and normal pressure, and is convenient to apply; 2) the viscosity reduction and sterilization can be realized simultaneously, the efficiency is high, the reaction speed is high, and two treatment technologies or two agents of a viscosity reducer and a bactericide are not required to be added; 3) no or only a small amount of chemical reagent is needed to be added, the ion concentration and salinity of the oilfield produced water are not increased, and secondary pollutants such as sludge and the like are not generated; 4) the electron accelerator is provided with a self-shielding device, and the gamma ray shielding and protection technology is mature day by day, both of which are applied in a plurality of fields, and have good safety.
(5) The method provided by the invention can effectively reduce the viscosity of the oilfield produced water to the viscosity of pure water at the same temperature, and can completely kill sulfate reducing bacteria, iron bacteria and saprophytic bacteria in the oilfield produced water.
Drawings
FIG. 1 is a graph comparing a frac flowback fluid treated with a combination of 2.5kGy, 5kGy, and 10kGy irradiation absorbed dose and hydrogen peroxide in example 5 with an original frac flowback fluid.
Detailed Description
The invention provides a method for reducing the viscosity of produced water in an oil field and simultaneously sterilizing, and the invention is further described by combining the embodiment and the attached drawings.
Example 1
Taking ternary sewage of a certain oil field, placing the ternary sewage into an irradiation reaction container, and adopting Co60Gamma ray (radiation activity 3.6X 10)14Bq) is irradiated near the central hole channel, and the dosage rate is about 240 Gy/min. Absorbed doses were controlled to 1kGy, 5kGy and 10kGy by adjusting irradiation time. And after the irradiation is finished, detecting the viscosity of the ternary sewage and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria under different absorbed doses. The experimental temperature was 23. + -. 0.5 ℃.
The viscosity (mPas) of the ternary wastewater was analyzed by a viscometer (NDJ-79 rotational viscometer, Shanghai apparatus science and technology, Ltd.). And (3) detecting the colony quantity cardinality (number/mL) of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria by respectively using a sulfate reducing bacteria test bottle, an iron bacteria test bottle and a saprophytic bacteria test bottle by adopting a culture method sterilization dilution method.
The viscosity of the original ternary sewage is 5.33 mPas, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are respectively 1.4 multiplied by 104，2.5×102And 1.4X 104one/mL.
When the irradiation absorption dose is 1kGy, the viscosity of the ternary sewage is not changed, and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria are 0, 0 and 1.4 multiplied by 104one/mL.
When the irradiation absorption dose is 5kGy, the viscosity of the ternary sewage is reduced to 3.2mPa & s, and the colony numbers of the detected sulfate reducing bacteria, iron bacteria and saprophytic bacteria are all 0.
When the irradiation absorption dose is 10kGy, the viscosity of the ternary sewage is further reduced to 1.7mPa & s, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all 0.
Example 2
Putting the produced water of a certain oil field sewage treatment station into an irradiation reaction container, and adopting Co60Gamma ray (radiation activity 3.6X 10)14Bq) is irradiated near the central hole channel, and the dosage rate is about 240 Gy/min. Absorbed doses were controlled to 2.5kGy and 5kGy by adjusting irradiation time. After irradiation, the viscosity of the oilfield produced water and the colony number of sulfate reducing bacteria, iron bacteria and saprophytic bacteria under different absorption doses are detected. The experimental temperature was 23. + -. 0.5 ℃.
The viscosity of the oilfield produced water and the number of colonies of sulfate reducing bacteria, iron bacteria and saprophytic bacteria were measured as in example 1.
The viscosity of the original oilfield produced water is 1.7 mPa.s, and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria are respectively 6.0 multiplied by 101，2.5×101And 1.1X 105one/mL.
When the irradiation absorption dose is 2.5kGy (the reaction time is about 10min), the viscosity of the produced water of the oil field is reduced to 1.2 mPa.s, the colony number of sulfate reducing bacteria and iron bacteria is reduced to 0, and the colony number of saprophytic bacteria is reduced to 2.5/mL.
When the irradiation absorption dose is 5kGy (the reaction time is about 20min), the viscosity of the produced water of the oil field is reduced to 1.05mPa & s, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all 0.
Example 3
Putting ternary sewage of a certain oil field into an irradiation reaction container, adding hydrogen peroxide of the ternary sewage with the concentration of 10mmol/L and the volume of 1.1mL/L, and adopting Co60Gamma ray (radiation activity 3.6X 10)14Bq) is irradiated near the central hole channel, and the dosage rate is about 240 Gy/min. Absorbed doses were controlled to 1kGy, 5kGy and 10 by adjusting irradiation timekGy. And after the irradiation is finished, detecting the viscosity of the ternary sewage and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria under different absorbed doses. The experimental temperature was 23. + -. 0.5 ℃.
The viscosity of the polymer-containing wastewater and the number of colonies of sulfate-reducing bacteria, iron bacteria and saprophytic bacteria were measured as in example 1.
The viscosity of the original ternary sewage is 5.33 mPas, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are respectively 1.4 multiplied by 104，2.5×102And 1.4X 104one/mL.
When the irradiation absorption dose is 1kGy (the reaction time is about 4min), the viscosity of the ternary sewage is not changed, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are 0, 0 and 1.3 multiplied by 101one/mL.
When the irradiation absorption dose is 5kGy (the reaction time is about 20min), the viscosity of the ternary sewage is reduced to 1.2mPa & s, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all reduced to 0.
When the irradiation absorption dose is 10kGy (the reaction time is about 40min), the viscosity of the ternary wastewater is further reduced to 1.00 mPas, which is the same as that of deionized water measured by the viscometer. The colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all 0.
Example 4
Putting polymer-containing sewage of a certain oil field into an irradiation reaction container, and adding hydrogen peroxide of ternary sewage with the concentration of 100mmol/L and the volume of 11 mL/L. By using Co60Gamma ray (radiation activity 3.6X 10)14Bq) is irradiated near the central hole channel, and the dosage rate is about 240 Gy/min. The absorbed dose was controlled to 2.5, 5.0kGy by adjusting the irradiation time. After the irradiation is finished, the viscosity of the polymer-containing sewage and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria under different absorption doses are detected. The experimental temperature was 23. + -. 0.5 ℃.
The viscosity of the polymer-containing wastewater and the number of colonies of sulfate-reducing bacteria, iron bacteria and saprophytic bacteria were measured as in example 1.
The original polymer-containing sewage has a viscosity of 1.7 mPas and contains sulfate reducing bacteria, iron bacteria and saprophytic bacteriaThe number of bacterial colonies was 6.0X 101，2×104And 1.1X 1011one/mL.
When the irradiation absorption dose is 2.5kGy (the reaction time is about 10min), the viscosity of the polymer-containing sewage is reduced to 1.05 mPa.s, and the colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all reduced to 0.
When the irradiation absorption dose was 5kGy (reaction time about 20min), the viscosity of the polymer-containing water was reduced to 1.00 mPas, which was the same as that of deionized water measured by the viscometer. The colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all 0.
Example 5
Putting the sewage of the fracturing flow-back fluid of a certain oil field into an irradiation reaction container, and adding hydrogen peroxide of ternary sewage with the concentration of 20mmol/L and the volume of 2.2 mL/L. By using Co60Gamma ray (radiation activity 3.6X 10)14Bq) is irradiated near the central hole channel, and the dosage rate is about 240 Gy/min. Absorbed doses were controlled to 2.5kGy, 5kGy and 10kGy by adjusting irradiation time. And after irradiation, detecting the viscosity of the fracturing flow-back liquid sewage and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria under different absorption doses. The experimental temperature was 23. + -. 0.5 ℃.
The viscosity of frac flowback sewage and the number of colonies of sulfate reducing bacteria, iron bacteria and saprophytic bacteria were measured as in example 1.
The viscosity of the original fracturing flow-back wastewater is 2.45 mPas, and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria are 1.2 multiplied by 10 respectively4，1.1×107And 1.1X 1012one/mL.
When the irradiation absorption dose is 2.5kGy (the reaction time is about 10min), the viscosity of the fracturing flow-back wastewater is reduced to 1.23 mPa.s, and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria are all reduced to 0.
When the irradiation absorption dose is 5kGy (the reaction time is about 20min), the viscosity of the fracturing flow-back liquid sewage is reduced to 1.20 mPa.s, and the colony numbers of sulfate reducing bacteria, iron bacteria and saprophytic bacteria are all 0.
When the irradiation absorption dose is 10kGy (the reaction time is about 40min), the viscosity of the fracturing flow-back wastewater is reduced to 1.00 mPas, which is the same as that of deionized water measured by the viscometer. The colony numbers of the sulfate reducing bacteria, the iron bacteria and the saprophytic bacteria are all 0.
Fig. 1 shows that the original fracturing flow-back fluid is compared with the fracturing flow-back fluid subjected to the combined treatment of 2.5kGy, 5kGy and 10kGy irradiation absorption doses and hydrogen peroxide in example 5, and the original fracturing flow-back fluid, the fracturing flow-back fluid subjected to the combined treatment of 2.5kGy irradiation absorption doses and hydrogen peroxide, the fracturing flow-back fluid subjected to the combined treatment of 5kGy irradiation absorption doses and hydrogen peroxide and the fracturing flow-back fluid subjected to the combined treatment of 10kGy irradiation absorption doses and hydrogen peroxide are sequentially arranged from left to right. As can be seen from fig. 1, the original fracturing flow-back fluid sewage is black and viscous, and after the combined treatment of ionizing radiation and hydrogen peroxide, the solution gradually becomes clear, and black oily substances are separated from the water body, float on the surface of the liquid and are easily removed by air flotation settlement.
Claims (10)
1. The method for reducing the viscosity of the oilfield produced water and simultaneously sterilizing is characterized by comprising the step of treating the oilfield produced water by ionizing radiation or treating the oilfield produced water by combining ionizing radiation and hydrogen peroxide, so that the viscosity of the oilfield produced water can be reduced and the oilfield produced water can be simultaneously sterilized.
2. The method of claim 1, wherein the treating the oilfield produced water with ionizing radiation in combination with hydrogen peroxide comprises: adding hydrogen peroxide into the produced water of the oil field, and then carrying out ionizing irradiation treatment.
3. The method of claim 1 or 2, wherein the oilfield produced water comprises one or more of polymer-containing wastewater, tertiary wastewater, and frac flowback wastewater.
4. The method of claim 1 or 2, wherein the ionizing radiation comprises a high-energy electron beam or gamma rays.
5. The method of claim 4, wherein the method is performed in a batch processThe high-energy electron beam is generated by an electron accelerator, and the gamma ray is generated by a radioactive isotope Co60Or Cs137Decay occurs.
6. The method according to claim 1 or 2, wherein the absorbed dose of ionizing radiation is not less than 1 kGy.
7. The method according to claim 1 or 2, wherein the absorbed dose of ionizing radiation is 2.5-10 kGy.
8. The method according to claim 1 or 2, wherein the concentration of the hydrogen peroxide is not less than 10mmol/L, and the consumption of the hydrogen peroxide is not less than 1.1mL/L of the oilfield produced water.
9. The method according to claim 1 or 2, wherein the concentration of the hydrogen peroxide is 20-100 mmol/L, and the dosage of the hydrogen peroxide is 2.2-11 mL/L of oilfield produced water.
10. The method of claim 1, wherein the sterilizing comprises killing sulfate-reducing bacteria, iron bacteria, and saprophytic bacteria.
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| CN114132987A (en) * | 2021-11-23 | 2022-03-04 | 清华大学 | Method for removing sulfide in oil field sewage by high-energy electron beam |
| CN114133082A (en) * | 2021-11-23 | 2022-03-04 | 清华大学 | Method for treating oil field sewage by electron beam irradiation |
| CN116764634A (en) * | 2022-03-11 | 2023-09-19 | 大庆油田有限责任公司 | Ionizing radiation catalyst, polyacrylamide solution and viscosity reduction method for polymer-containing sewage in oil field |
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| CN114132987A (en) * | 2021-11-23 | 2022-03-04 | 清华大学 | Method for removing sulfide in oil field sewage by high-energy electron beam |
| CN114133082A (en) * | 2021-11-23 | 2022-03-04 | 清华大学 | Method for treating oil field sewage by electron beam irradiation |
| CN116764634A (en) * | 2022-03-11 | 2023-09-19 | 大庆油田有限责任公司 | Ionizing radiation catalyst, polyacrylamide solution and viscosity reduction method for polymer-containing sewage in oil field |
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