CN106315960B - Method for treating oil and gas field wastewater - Google Patents
Method for treating oil and gas field wastewater Download PDFInfo
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Classifications
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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
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/481—Treatment of water, waste water, or sewage with magnetic or electric fields using permanent magnets
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for treating oil and gas field wastewater, which comprises the following steps: and after the wastewater is subjected to electrocatalytic oxidation treatment under the condition of a pulse power supply, adding a magnetic flocculant to perform a flocculation precipitation reaction, and performing magnetic separation and solid-liquid separation to obtain the treated oil-gas field wastewater. The method has good treatment effect on the oil and gas field wastewater, high resource utilization rate of the treated wastewater, simple process and easy automation control.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for treating oil and gas field wastewater
Background
Along with the increase of oil and gas exploration strength, the number of the production and transportation wells is gradually increased, the amount of the brought wastewater is increased year by year, the wastewater of the oil and gas field comprises low-molecular organic compounds and alkaline substances which are generated by biodegradation of harmful components causing environmental pollution such as oil, salts, bactericides, certain chemical additives, heavy metals (such as mercury, copper, chromium, cadmium, zinc, lead and the like) and high-molecular organic compounds, so that the main pollution indexes such as chromaticity, COD, SS, petroleum and the like are greatly overproof, the dyeing property is strong, if the wastewater is directly discharged without being treated, the ecological environment is seriously damaged for the environment, and the sustainable exploitation and development of the oil and gas field are influenced.
At present, the treatment method of oil and gas field wastewater is mainly a physical and chemical method, and chemical treatment agents are adopted for coagulation, sedimentation and solid-liquid separation, and then oxidation treatment is carried out. This process has the following disadvantages: the addition of the chemical treatment agent is large, and high-valence metal ions are introduced, so that secondary pollution is caused and resource utilization is influenced; the treatment process is complex, the treated floc amount is large, and the solid-liquid separation load is increased; the treatment cost is high; the treatment is difficult to reach the standard; the treatment effect is easily influenced by the quality of the wastewater; the process is complex, difficult to skid-mount and low in automation control degree.
Disclosure of Invention
In view of the above, the invention provides a method for treating oil and gas field wastewater, which has the advantages of good treatment effect on the oil and gas field wastewater, high resource utilization rate of the treated wastewater, simple process and easy automation control.
A method for treating oil and gas field wastewater comprises the following steps: and after the wastewater is subjected to electrocatalytic oxidation treatment under the condition of a pulse power supply, adding a magnetic flocculant to perform a flocculation precipitation reaction, and performing magnetic separation and solid-liquid separation to obtain the treated oil-gas field wastewater.
Preferably, the oil and gas field wastewater is drilling wastewater or slickwater flowback fluid.
Preferably, the oil and gas field wastewater is drilling wastewater.
Preferably, the oil and gas field wastewater is fracturing wastewater.
Preferably, the anode electrode for electrocatalytic oxidation treatment is an iron electrode, an aluminum electrode or a titanium-plated electrode, and the cathode electrode is a graphite electrode.
Preferably, the anode electrode is a titanium-plated electrode.
Preferably, the electrocatalytic oxidation time is 30-240 min.
Preferably, the electrocatalytic oxidation time is 30-120 min.
Preferably, the electrocatalytic oxidation treatment uses titanium dioxide as a catalyst.
Preferably, the titanium dioxide is used in an amount of 10 wt% of the oil and gas field wastewater.
Preferably, the magnetic flocculant is surface organic modified permanent magnet powder.
Preferably, the dosage of the magnetic flocculant is 3-6 g/L of oil and gas field wastewater.
Preferably, the dosage of the magnetic flocculant is 5-6 g/L of oil and gas field wastewater.
Preferably, the method further comprises: and carrying out resource utilization on the treated oil-gas field wastewater.
Preferably, the resource utilization is the preparation of the drilling fluid.
Preferably, the resource utilization is to prepare a fracturing fluid.
Preferably, the step of obtaining the treated oil-gas field wastewater through magnetic separation solid-liquid separation specifically comprises the steps of performing magnetic separation solid-liquid separation, rectifying an obtained liquid phase to obtain the treated wastewater, and recovering an obtained solid phase to obtain the magnetic flocculant.
Preferably, the magnetic separation is performed by using a disk type magnetic separation system.
The electrode generates catalytic oxidation reaction in water in the electrocatalytic oxidation treatment process of the oil and gas field wastewater, and hydroxyl free radicals OH and O with strong oxidizability are generated on the surface of the anode2Generating H on the cathode surface2O2、H2The following reactions are generated under the simultaneous action of the anode and the cathode: on one hand, the strong oxidizing property of hydroxyl free radicals (. OH) generated on the surface of the anode carries out strong oxidation reaction on organic matters in water to degrade the organic matters into CO2And H2And O. At the same time, a small amount of H is generated on the surface of the cathode2O2Is also strong in oxidizability and participates in the oxidation of organic matters in water. Finally, the gel breaking of the oil-gas field wastewater is realized. The other negative cathode generates a large amount of H2Because its bubble is minimum and volume is big, played splendid air-float effect, with the suspended solid adhesion in the water and float out of the surface of water, make tiny suspended solid become comparatively easy clearance. The magnetic flocculant is selected to flocculate suspended matters in the oil-gas field wastewater. The non-consumable electrode can be preferably used as the anode electrode, the gel is broken without depending on the metal ions generated by the consumable electrode, and the generated floc is less. The pulse power supply is adopted to replace a direct current or alternating current power supply, so that passivation, scaling corrosion to the electrode are reduced, and the electrocatalytic oxidation effect is improved.
The flocculation precipitation of the invention adopts the flocculation effect of adding the magnetic flocculant and suspended matters in the oil and gas field wastewater, and effectively separates the suspended matters. Performing magnetic separation, solid-liquid separation and solid-phase floc deposition on the oil-gas field wastewater subjected to flocculation precipitation, and recycling the magnetic flocculant by oscillating and sorting the magnetic flocculant in the floc; and (4) finely filtering the liquid phase to obtain the treated oil-gas field wastewater.
Compared with the prior art, the invention is explained in detail as follows:
the waste water of the oil-gas field is treated by electrocatalytic oxidation, and the waste water of the oil-gas field is effectively decomposed or modified, so that the waste water is easy to settle and separate. The pulse power supply is adopted, the electrocatalytic oxidation effect is improved, and meanwhile, a non-consumable electrode can be adopted, so that the amount of produced floc is reduced little, and the wastewater treatment effect of the oil-gas field is good;
chemical reactive agents are not added in the process of gel breaking and coagulation treatment of the drilling wastewater, and only recyclable magnetic flocculating agents are added, so that secondary pollution is reduced, flocculation and solid-liquid separation effects are improved, the resource utilization rate of the treated wastewater is improved, and the method can be used for preparing drilling fluid;
the magnetic separation is adopted for solid-liquid separation, the separation speed is high, the separation is thorough, the water content of the separated solid phase is low, the separation equipment is small, and the automatic control is easy;
the treated oil and gas field wastewater is recycled, so that the energy is saved, the recycling effect is good, and the recycling utilization rate is high;
the method has the advantages of simple process, strong adaptability, good treatment effect and low treatment cost, and can realize skid-mounted and integrated treatment.
Detailed Description
The invention discloses a method for treating oil and gas field wastewater, which can be realized by appropriately improving process parameters by a person skilled in the art by referring to the content in the text. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for treating oil and gas field wastewater comprises the following steps: and after the wastewater is subjected to electrocatalytic oxidation treatment under the condition of a pulse power supply, adding a magnetic flocculant to perform a flocculation precipitation reaction, and performing magnetic separation and solid-liquid separation to obtain the treated oil-gas field wastewater.
The oil and gas field wastewater is drilling wastewater or slickwater flowback fluid. Preferably, the oil and gas field wastewater is drilling wastewater. Preferably, the oil and gas field wastewater is fracturing wastewater.
The anode electrode for electrocatalytic oxidation treatment is an iron electrode, an aluminum electrode or a titanium-plated electrode, and the cathode electrode is a graphite electrode. Preferably, the anode electrode is a titanium-plated electrode. Preferably, the electrocatalytic oxidation time is 30-240 min; more preferably, the electrocatalytic oxidation time is 30-120 min. The electrocatalytic oxidation treatment adopts titanium dioxide as a catalyst. Preferably, the titanium dioxide is used in an amount of 10 wt% of the oil and gas field wastewater.
The magnetic flocculant is surface organic modified permanent magnet powder. Preferably, the dosage of the magnetic flocculant is 3-6 g/L of oil and gas field wastewater. More preferably, the concentration is 5-6 g/L of oil and gas field wastewater.
The method of the invention also comprises the following steps: and carrying out resource utilization on the treated oil-gas field wastewater. Preferably, the resource utilization is to prepare the drilling fluid; more preferably, the resource utilization is the preparation of fracturing fluid.
The method for obtaining the treated oil-gas field wastewater through the magnetic separation solid-liquid separation comprises the following steps of performing the magnetic separation solid-liquid separation, rectifying the obtained liquid phase to obtain the treated wastewater, and recovering the obtained solid phase to obtain the magnetic flocculant.
Example 1
Comparing the treatment effect of electrocatalytic oxidation with that of the conventional treatment technology
Experimental conditions of the control group: taking 500mL of drilling wastewater, adding 6000mg/L of gel breaking coagulant PAC (polyaluminium chloride), stirring and coagulating for 15min, adjusting the pH to 9-10 by adopting sodium hydroxide, adding 30mg/L of PAM (polyacrylamide), slowly stirring for 2-3 min by adopting a pulse power supply, carrying out centrifugal separation, and carrying out COD (chemical oxygen demand), pH, SS (suspended solids), chromaticity, oil content, floc water content and dry floc weight of the separated water phase.
The experimental conditions of the invention are as follows: taking 500mL of drilling wastewater, controlling the electrocatalytic oxidation time for 30min, adding surface organic modified permanent magnet powder as a magnetic flocculant with the dosage of 6g/L of drilling wastewater, stirring, flocculating and precipitating for 10min, performing solid-liquid separation by using a magnetic disk, oscillating a separated solid phase to recover the magnetic flocculant, finely filtering the separated water phase, and testing and analyzing COD (chemical oxygen demand) after fine filtrationcrpH, SS, color, oil content, water content of flocThe dry floc weight and the structure are shown in Table 1.
TABLE 1 comparison of the effects of treating drilling wastewater by electrocatalytic oxidation and conventional treatment techniques
Example 2
Electrode plate comparison study
Taking 500mL of drilling wastewater, respectively adopting an aluminum electrode, an iron electrode and a titanium-plated electrode as anodes, adopting graphite as a cathode, adopting a pulse power supply, controlling the electrocatalytic oxidation time for 30min, adopting powdered titanium dioxide (with the particle size of 200 meshes) as a catalyst, adding 10 wt% of titanium dioxide into the wastewater, adding permanent magnet powder with the surface organically modified as a magnetic flocculant, using 6g/L of drilling wastewater, stirring, flocculating and precipitating for 10min, carrying out solid-liquid separation by adopting a magnetic disk, oscillating the separated solid phase to recover the magnetic flocculant, finely filtering the separated water phase, and testing and analyzing COD (chemical oxygen demand) after finely filteringcrpH, SS, chroma, oil content, floc water content, floc settling velocity and filtration speed, and the results are shown in Table 2.
TABLE 2 Effect of treating drilling wastewater with different polar plates
Example 3
Power type impact on processing effectiveness
An aluminum electrode and a titanium-plated electrode are used as anodes, graphite is used as a cathode, a direct-current power supply and a pulse power supply are respectively adopted to treat drilling wastewater, a catalyst adopts powdered titanium dioxide (the grain diameter is 200 meshes), the use amount of the titanium dioxide is 10 wt% of the wastewater, other electrocatalytic conditions are kept consistent, permanent magnet powder with the surface organically modified is added as a magnetic flocculant, the use amount of the magnetic flocculant is 6g/L of the drilling wastewater, stirring, flocculating and precipitating are carried out for 10min, and a magnetic disk is adopted to carry out solid-Separating, shaking the separated solid phase to recover magnetic flocculant, fine filtering the separated water phase, and testing and analyzing CODcrpH, SS, color, oil content, results are shown in table 3.
TABLE 3 effects of treating drilling wastewater with different polar plates and different power types
As can be seen from Table 3, the treatment effect is different when different electrode plates have the same power supply, and the titanium-plated electrode has good treatment effect no matter which power supply type is adopted. Meanwhile, the same polar plate is used for treating the drilling wastewater, and the treatment effect of the pulse power supply is obviously superior to that of a direct-current power supply.
Example 4
Effect of treating drilling waste water by electrode with different time consumption
An aluminum electrode is used as an anode, graphite is used as a cathode, a direct current power supply and a pulse power supply are respectively adopted to treat drilling wastewater, the electrocatalytic oxidation time is controlled according to table 4, the catalyst adopts powdered titanium dioxide (with the particle size of 200 meshes), the use amount of the titanium dioxide is 10 wt% of the wastewater, the surface organically modified permanent magnet powder is used as a magnetic flocculant, the use amount is 6g/L of the drilling wastewater, the stirring flocculation and precipitation are carried out for 10min, a magnetic disk is adopted to carry out solid-liquid separation, the separated solid phase is vibrated to recover the magnetic flocculant, the separated water phase is subjected to fine filtration, and the COD (chemicalcrpH, SS, color, oil content, results are shown in table 4.
TABLE 4 effects of treating drilling wastewater with electrode plates at different treatment times
As can be seen from Table 4, when the drilling wastewater is treated by the metal electrode, the influence of different time on the treatment effect is analyzed, and as the treatment time increases, when the wastewater is treated by the direct-current power supply, the treatment effect is firstly improved, and then is greatly reduced, because as the treatment time increases, the consumption of the metal electrode increases, and the treatment efficiency of the metal electrode decreases. For the treatment of the drilling wastewater by adopting the pulse power supply, the treatment efficiency is basically unchanged due to the increase of time, which shows that the pulse power supply is favorable for reducing the effects of electrode corrosion and scaling on the surface of a polar plate.
Example 5:
resource utilization of treated waste water for preparing drilling fluid
A titanium-plated electrode is used as an anode, graphite is used as a cathode, 2000ml of drilling wastewater is treated by a pulse power supply, the electrocatalytic oxidation time is controlled for 40min, powdered titanium dioxide (with the particle size of 200 meshes) is used as a catalyst, the use amount of the titanium dioxide is 10 wt% of the wastewater, permanent magnet powder with the surface organically modified is added as a magnetic flocculant, the use amount of the magnetic flocculant is 6g/L of the drilling wastewater, stirring, flocculating and precipitating are carried out for 10min, and solid-liquid separation is carried out by a magnetic disk. And (3) vibrating the separated solid phase to recover the magnetic flocculant, finely filtering the separated water phase, preparing a water-based polymer drilling fluid from the water sample after fine filtration, and investigating the comparison with a polymer drilling fluid prepared from clear water.
Taking 400mL of water sample of the treated drilling wastewater and 400mL of tap water, respectively adding bentonite accounting for 4 wt% of the water sample or tap water of the drilling wastewater and 0.25 wt% of sodium bicarbonate according to the API standard to prepare a drilling fluid base slurry, forming for 24h, then adding the water sample of the drilling wastewater or 1 wt% of CMC of the tap water, and testing and analyzing the basic performance indexes of the two polymer drilling fluids, wherein the results are shown in Table 5.
TABLE 5 resource utilization of treated water of the present invention for preparing drilling fluid
As can be seen from Table 5, the performance index of the polymer drilling fluid prepared from the water treated by the electrocatalytic oxidation of the drilling wastewater is basically consistent with that of the polymer drilling fluid prepared from clear water, which indicates that the polymer drilling fluid prepared from the water sample treated by the electrocatalytic oxidation of the drilling wastewater can be recycled, so that the aim of changing waste into valuable is fulfilled, the environmental pollution is reduced, and the comprehensive treatment cost is reduced.
Example 6
Different water samples are prepared into slickwater fracturing fluid base fluid rheological property and temperature resistance effect contrast
Taking 2000mL of the return drainage liquid of the slick water, adopting a titanium-plated electrode as an anode and graphite as a cathode, taking 2000mL of the return drainage liquid of the slick water, adopting a pulse power supply to treat the return drainage liquid of the slick water, controlling the electrocatalytic oxidation time for 20min, adding permanent magnet powder with the surface organically modified as a magnetic flocculant, wherein the dosage is 3g/L, stirring, flocculating and precipitating for 5min, adopting a magnetic disk to perform solid-liquid separation, vibrating the separated solid phase to recover the magnetic flocculant, and finely filtering the separated water phase to obtain a treated return drainage liquid sample of the slick water.
Respectively taking a water sample of the slickwater return liquid for direct sedimentation, respectively taking 400mL of the water sample of the slickwater return liquid treated by the method and respectively adding 0.03% of polymer resistance reducing agent into tap water, and respectively adopting a six-speed rotational viscometer (170 s) after dissolution-1) Formulated slickwater was prepared at different temperatures and tested for slickwater fracturing fluid specifications with the results shown in table 6.
TABLE 6
As can be seen from Table 6, the slickwater flowback liquid is directly settled and then the upper water sample is taken, the content of Suspended Solids (SS) is higher, the water color is light yellow, the chroma is high, the dissolution time of the resistance reducing agent is longer, the solution viscosity effect of the prepared slickwater fracturing liquid is better at 25 ℃, but the solution viscosity is reduced rapidly along with the temperature increase, and the temperature resistance of the prepared slickwater fracturing liquid is poor. The slickwater returning liquid treated by the method has the advantages of low content of suspended solids SS, clear water color, low chroma, quick dissolution of the resistance reducing agent in water, and small change of various performance indexes of the prepared slickwater fracturing fluid at different temperatures, and shows that the slickwater fracturing fluid prepared by the slickwater returning liquid treated by the method has better stability and temperature resistance.
Example 7
Gel breaking and residue comparison of slickwater fracturing fluid prepared from different water samples
Taking 2000mL of the return drainage liquid of the slick water, adopting a titanium-plated electrode as an anode and graphite as a cathode, taking 2000mL of the return drainage liquid of the slick water, adopting a pulse power supply to treat the return drainage liquid of the slick water, controlling the electrocatalytic oxidation time for 20min, adding permanent magnet powder with the surface organically modified as a magnetic flocculant, wherein the dosage is 3g/L, stirring, flocculating and precipitating for 5min, adopting a magnetic disk to perform solid-liquid separation, vibrating the separated solid phase to recover the magnetic flocculant, and finely filtering the separated water phase to obtain a treated return drainage liquid sample of the slick water.
Taking a direct settling water sample of the slickwater flowback liquid, a treated water sample of the slickwater flowback liquid and 400mL of tap water respectively, adding 0.03% of polymer resistance reducing agent and 0.01% of gel breaker respectively to prepare a base fluid of the slickwater fracturing fluid, and testing and analyzing gel breaking time, viscosity after gel breaking and residue amount at 90 ℃, wherein the results are shown in Table 7.
TABLE 7 preparation of slickwater fracturing fluids with different water samples for gel breaking and residue comparison
| Gel breaking time/min | Viscosity mPa.s after gel breaking | Residue amount/mg/L | |
| Preparation of slickwater from settling flowback fluid | 30 | 1.5 | 325.5 |
| Slick water prepared from clear water | 30 | 1.1 | — |
| The invention prepares slick water by treating water sample after treatment | 30 | 1.2 | 13.2 |
As can be seen from Table 7, under the same gel breaking time, the wastewater treated by the method is prepared into slick water, and the viscosity of the gel broken residual liquid is low, the residual amount is small, the flowback is facilitated, and the damage to the reservoir is small.
Example 8
Drainage-assisting comparison of slickwater fracturing fluid prepared from different water samples
Taking 2000mL of the return drainage liquid of the slick water, adopting a titanium-plated electrode as an anode and graphite as a cathode, taking 2000mL of the return drainage liquid of the slick water, adopting a pulse power supply to treat the return drainage liquid of the slick water, controlling the electrocatalytic oxidation time for 20min, adding permanent magnet powder with the surface organically modified as a magnetic flocculant, wherein the dosage is 3g/L, stirring, flocculating and precipitating for 5min, adopting a magnetic disk to perform solid-liquid separation, vibrating the separated solid phase to recover the magnetic flocculant, and finely filtering the separated water phase to obtain a treated return drainage liquid sample of the slick water.
Taking 400mL of a water sample of the slickwater flowback liquid directly settled, a water sample of the slickwater flowback liquid treated by the method and tap water respectively, adding 0.03% of polymer resistance reducing agent and 0.01% of gel breaker respectively to prepare a slickwater fracturing fluid base fluid, and testing and analyzing the surface tension of the solution after gel breaking for many times, wherein the results are shown in Table 8.
TABLE 8 comparison of drainage aid of base fluid for slickwater fracturing fluids prepared from different water samples
The analysis of the table 8 shows that the surface tension of the treated water sample is lower than that of the slickwater after the treated water sample is directly settled after gel breaking, and the slickwater is prepared after the treated water sample is treated by the method, so that the treated water sample is favorable for flowback, and the slickwater is completely returned and has little damage to the stratum.
Example 9:
comparison of waste liquor utilization
Taking 2000mL of the return drainage liquid of the slick water, adopting a titanium-plated electrode as an anode and graphite as a cathode, taking 2000mL of the return drainage liquid of the slick water, adopting a pulse power supply to treat the return drainage liquid of the slick water, controlling the electrocatalytic oxidation time for 20min, adding permanent magnet powder with the surface organically modified as a magnetic flocculant, wherein the dosage is 3g/L, stirring, flocculating and precipitating for 5min, adopting a magnetic disk to perform solid-liquid separation, vibrating the separated solid phase to recover the magnetic flocculant, and finely filtering the separated water phase to obtain a treated return drainage liquid sample of the slick water.
Taking a direct settling water sample of the slickwater flowback liquid, a treated water sample of the slickwater flowback liquid and 400mL of tap water respectively, adding 0.03% of polymer resistance reducing agent and 0.01% of gel breaker respectively to prepare a slickwater fracturing fluid base fluid, and testing and analyzing the performance of the prepared slickwater fracturing fluid base fluid for many times until the viscosity reaches 5mPa & s at 90 ℃, wherein the results are shown in Table 9.
TABLE 9 comparison of waste liquor utilization
As can be seen from Table 9, when the method is adopted to treat the flowback liquid and then prepare the slickwater, the utilization rate of the wastewater is far higher than that of the process of directly settling the flowback liquid, and the resource utilization rate of the wastewater reaches 83.8 percent. The method is beneficial to maximizing resource utilization and achieving the purposes of energy conservation and emission reduction.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. A method for treating oil and gas field wastewater is characterized by comprising the following steps: and after the wastewater is subjected to electrocatalytic oxidation treatment under the condition of a pulse power supply, adding a magnetic flocculant to perform a flocculation precipitation reaction, performing magnetic separation and solid-liquid separation, rectifying the obtained liquid phase to obtain the treated wastewater, and recovering the obtained solid phase to obtain the magnetic flocculant.
2. The treatment method according to claim 1, wherein the oil and gas field wastewater is drilling wastewater or slickwater flowback fluid.
3. The process of claim 1, wherein the electrocatalytic oxidation treatment anode electrode is an iron electrode, an aluminum electrode, or a titanium-plated electrode, and the cathode electrode is a graphite electrode.
4. The process of claim 3, wherein the anodic electrode is a titanium plated electrode.
5. The treatment process according to claim 1, characterized in that the electrocatalytic oxidation treatment time is 30 to 240 min.
6. The process of claim 1, wherein the electrocatalytic oxidation treatment employs titanium dioxide as a catalyst.
7. The process of claim 1, wherein the magnetic flocculant is surface organically modified permanent magnet powder.
8. The treatment method according to claim 1, wherein the dosage of the magnetic flocculant is 3-6 g/L of oil and gas field wastewater.
9. The processing method according to claim 1, characterized in that the method further comprises: and carrying out resource utilization on the treated oil-gas field wastewater.
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