CN115259470A - Treatment method of fracturing flow-back fluid - Google Patents
Treatment method of fracturing flow-back fluid Download PDFInfo
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- CN115259470A CN115259470A CN202210985302.3A CN202210985302A CN115259470A CN 115259470 A CN115259470 A CN 115259470A CN 202210985302 A CN202210985302 A CN 202210985302A CN 115259470 A CN115259470 A CN 115259470A
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- treating
- aeration
- fluid
- flowback fluid
- fracturing flow
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to a method for treating fracturing flow-back fluid. The invention comprises the following steps: 1) Pre-treating; 1.1 Putting the fracturing flow-back fluid into an aeration pretreatment tank, and adding sodium hydroxide to adjust the pH value to be more than 10; 1.2 Hydrogen peroxide and defoaming agent are added into the fracturing flow-back fluid with the pH value of more than 10; 1.3 Opening the aeration device, wherein the aeration time is more than 8 hours, and naturally settling after the aeration is finished; 2) And (4) enabling the supernatant of the settled sewage obtained after pretreatment to enter an air floatation device, and flocculating and separating mud and water by utilizing air floatation. The invention has the advantages of reducing the treatment cost, improving the utilization rate of sewage, effectively removing the content of Fe ions, removing sludge in water and reducing the treatment pressure of workshop equipment.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a method for treating fracturing flow-back fluid.
Background
The residual fracturing fluid discharged back in the fracturing operation contains guanidine gum, bactericide, petroleum and other additives, and if the residual fracturing fluid is discharged without being treated, the residual fracturing fluid can cause serious pollution to the surrounding environment. The physical method, the chemical method and the microbial degradation method for treating the fracturing waste liquid mainly comprise a flocculation method, a membrane filtration method, an air floatation method and other chemical methods, and mainly comprise an oxidation method, an electrolysis treatment method and the like. The current new treatment technology aiming at the fracturing flowback fluid is a combined technology of a flocculation method, an oxidation method, a biological method and an adsorption method. These methods all have the disadvantages of high cost in the treatment process, low utilization rate of sewage and the like.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method for treating fracturing flow-back fluid, which has the advantages of reducing the treatment cost, improving the utilization rate of sewage, effectively removing the content of Fe ions, removing sludge in water and reducing the treatment pressure of workshop equipment.
The technical solution of the invention is as follows: the invention relates to a method for treating fracturing flowback fluid, which is characterized by comprising the following steps: the method comprises the following steps:
1) Pretreatment of
1.1 Putting the fracturing flow-back fluid into an aeration pretreatment tank, and adding sodium hydroxide to adjust the pH value to be more than 10;
1.2 Hydrogen peroxide and antifoaming agent are added into the fracturing flow-back fluid with the pH value of more than 10; adding hydrogen peroxide to oxidize and decompose organic molecules and macromolecular substances in the fracturing flow-back fluid, so that the viscosity of the sewage is reduced, and suspended matters in the sewage are reduced; the defoaming agent is added to reduce the generation of foam in the aeration process and prevent foam pollution;
1.3 Starting an aeration device, wherein the aeration time is more than 8 hours, and naturally settling after the aeration is finished;
2) And (4) enabling the supernatant of the settled sewage obtained after pretreatment to enter an air floatation device, and flocculating and separating mud and water by utilizing air floatation.
Further, step 2) is followed by step 3) of introducing the air flotation treatment water into an ozone device for sterilization treatment.
Further, the step 3) is followed by a step 4) of filtering the air flotation processing water after the ozone sterilization processing by quartz sand and active carbon.
Furthermore, the air flotation device is a two-stage coagulation flocculation air flotation tank.
Furthermore, the device for filtering by using the quartz sand and the activated carbon comprises two quartz sand filters, one activated carbon filter and one cotton ball filter.
Furthermore, the content of hydrogen peroxide is 1mg/L, and the content of the defoaming agent is 0.005mg/L.
Further, adding polyaluminium chloride and polyacrylamide into the supernatant of the settled sewage in the air floatation device in the step 2) for flocculation. Flocculation is a substance which can lead dispersed particles to be gathered, thereby obtaining larger particles and improving the solid-liquid separation speed, and the action mechanism is that the solid-liquid separation is caused by reducing or reversing the electric repulsion among colloids and connecting and enlarging the particles through the polymer bridging action, thereby reducing suspended matters in sewage.
Further, 200mg/L of polyaluminum chloride and 0.05mg/L of polyacrylamide are added for flocculation in the step 2).
The method for treating the fracturing flow-back fluid comprises the steps of firstly carrying out sewage pretreatment, adjusting the pH value of sewage to 10, then adding hydrogen peroxide, then carrying out aeration, carrying out aeration for 8 hours, carrying out coagulation sedimentation on air flotation and adding polyaluminium chloride (PAC) and Polyacrylamide (PAM), reacting by a two-stage coagulation flocculation air flotation tank, then carrying out ozone disinfection, entering a softening reaction tank for further decomposing, removing pollutants and purifying water quality, and then carrying out two quartz sand filters, an activated carbon filter and a cotton ball filter to treat water quality to meet the oilfield reinjection standard. Therefore, the beneficial effects of the invention are as follows:
1) The invention removes the traditional reverse osmosis treatment process, has high reverse osmosis process cost, low sewage utilization rate and complex maintenance, reduces the treatment cost by adopting the treatment process and improves the sewage utilization rate.
2) The PH value of the fracturing flow-back fluid treatment is more than 10, so that a guar gum system of the fracturing flow-back fluid is effectively destroyed, the viscosity of the fracturing flow-back fluid is reduced, and the content of Fe ions is effectively removed.
3) The invention further performs long-time aeration treatment through oxidation, the fracturing flow-back fluid forms effective flocculation precipitation, sludge in water is removed, and the treatment pressure of workshop equipment is reduced.
Detailed Description
The method of the embodiment of the invention is as follows:
1) Pretreatment of
1.1 Putting the fracturing flow-back fluid into an aeration pretreatment tank, and adding sodium hydroxide to adjust the pH value to be more than 10;
1.2 Hydrogen peroxide and defoaming agent are added into the fracturing flow-back fluid with the pH value of more than 10; the water content is 1mg/L, and the defoaming agent content is 0.005mg/L
1.3 Opening the aeration device, wherein the aeration time is more than 8 hours, and naturally settling after the aeration is finished;
2) The supernatant of the settled sewage obtained after pretreatment enters an air flotation device, and after flocculation, the water and the water are separated by using air flotation, wherein the air flotation device is a two-stage coagulation flocculation air flotation tank; adding 200mg/L of polyaluminium chloride and 0.05mg/L of polyacrylamide into supernatant of settled sewage in an air floatation device for flocculation;
3) Introducing air floatation treatment water into an ozone device for sterilization treatment;
4) The air floatation water after ozone sterilization is filtered by quartz sand and activated carbon, and the devices for filtering the quartz sand and the activated carbon comprise two quartz sand filters, an activated carbon filter and a cotton ball filter.
The specific application embodiment and experimental effects of the invention are as follows:
the first embodiment is as follows:
1) Pretreatment fracturing flowback fluid with hardness of 8000mg/L
1.1 At 1000 m) 3 2 tons of sodium hydroxide are added into the fracturing flow-back fluid, and the PH value is adjusted to 10;
1.2 1000 kg of hydrogen peroxide and 50 kg of defoaming agent are added into the fracturing flow-back fluid with the pH value of 10;
1.3 Opening an aeration device, aerating for 8 hours, and naturally settling;
testing the water quality after sedimentation, wherein the PH value is 10, the suspended matters are 8mg/L, the iron ions are 0.28mg/L, and the sulfides are 0mg/L, and the oilfield reinjection marking is basically met except the overhigh PH value.
2) After pretreatment, air floatation is carried out, 200mg/L of polyaluminium chloride and 0.05mg/L of polyacrylamide are added, and the water quality test pH value is 7.5, the suspended matters are 6mg/L, the iron ions are 0.15mg/L and the sulfides are 0mg/L, so that the oil field reinjection standard is met.
3) Then adding 0.05mg/L of scale inhibitor into the air flotation treatment water after ozone oxidation and two-stage filtration, testing the water quality, and completely meeting the reinjection standard of reinjection water suspended matter of 10mg/L, wherein the PH value is 7, the suspended matter is 4mg/L, the iron ion is 0.26mg/L, and the sulfide is 0 mg/L.
The second embodiment:
2) Pretreatment of fracturing flow-back fluid with hardness of 20000mg/L
1.1 At 1000 m) 3 Adding 5 tons of sodium hydroxide into the fracturing flow-back fluid, and adjusting the pH value to 10;
1.2 1000 kg of hydrogen peroxide and 50 kg of defoaming agent are added into the fracturing flow-back fluid with the pH value of 10;
1.3 Opening an aeration device, aerating for 8 hours, and naturally settling;
testing the water quality after sedimentation, wherein the PH value is 10, the suspended matters are 12mg/L, the iron ions are 0.12mg/L and the sulfides are 0mg/L, and the oilfield reinjection marking is basically met except the overhigh PH value.
2) After pretreatment, air floatation is carried out, 200mg/L of polyaluminium chloride and 0.05mg/L of polyacrylamide are added, and the water quality test shows that the PH value is 7.5, the suspended matters are 8mg/L, the iron ions are 0.13mg/L and the sulfides are 0mg/L, so that the oil field reinjection standard is met.
3) Then adding 0.05mg/L of scale inhibitor into the air flotation treatment water after ozone oxidation and two-stage filtration, testing the water quality, and completely meeting the reinjection standard of reinjection water suspended matter of 10mg/L, wherein the PH value is 7, the suspended matter is 6mg/L, the iron ion is 0.11mg/L, and the sulfide is 0 mg/L.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
The present invention and the technical contents not specifically described in the above embodiments are the same as the prior art.
The present invention is not limited to the above-described embodiments, and the present invention can be carried out with the above-described advantageous effects.
Claims (8)
1. A treatment method of fracturing flowback fluid is characterized by comprising the following steps: the method comprises the following steps:
1) Pretreatment of
1.1 Putting the fracturing flow-back fluid into an aeration pretreatment tank, and adding sodium hydroxide to adjust the pH value to be more than 10;
1.2 Hydrogen peroxide and antifoaming agent are added into the fracturing flow-back fluid with the pH value of more than 10;
1.3 Opening the aeration device, wherein the aeration time is more than 8 hours, and naturally settling after the aeration is finished;
2) And (4) enabling the supernatant of the settled sewage obtained after pretreatment to enter an air floatation device, and flocculating and separating mud and water by utilizing air floatation.
2. The method of treating a frac flowback fluid of claim 1, wherein: and step 3) of introducing the air floatation treatment water into an ozone device for sterilization treatment after the step 2).
3. The method of treating a frac flowback fluid of claim 2, wherein: and step 3) is followed by step 4) of filtering the air flotation treated water subjected to ozone sterilization by using quartz sand and activated carbon.
4. The method of treating a frac flowback fluid of claim 3, wherein: the air flotation device is a two-stage coagulation flocculation air flotation tank.
5. The method of treating a frac flowback fluid of claim 3, wherein: the quartz sand and activated carbon two-stage filtering device comprises two quartz sand filters, an activated carbon filter and a cotton ball filter.
6. The method of treating a frac flowback fluid of claims 1 to 5, wherein: the content of the hydrogen peroxide is 1mg/L, and the content of the defoaming agent is 0.005mg/L.
7. The method of treating a frac flowback fluid of claim 6, wherein: adding polyaluminium chloride and polyacrylamide into the supernatant of the settled sewage in the air floatation device in the step 2) for flocculation.
8. The method of treating a frac flowback fluid of claim 7, wherein: in the step 2), 200mg/L of polyaluminium chloride and 0.05mg/L of polyacrylamide are added for flocculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210985302.3A CN115259470A (en) | 2022-08-18 | 2022-08-18 | Treatment method of fracturing flow-back fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210985302.3A CN115259470A (en) | 2022-08-18 | 2022-08-18 | Treatment method of fracturing flow-back fluid |
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| CN202210985302.3A Pending CN115259470A (en) | 2022-08-18 | 2022-08-18 | Treatment method of fracturing flow-back fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116177780A (en) * | 2022-12-11 | 2023-05-30 | 延安圣洋环保有限公司 | Treatment method of drilling waste liquid |
| CN116239243A (en) * | 2022-12-11 | 2023-06-09 | 延安圣洋环保有限公司 | Mixed treatment method for drilling waste liquid and fracturing flowback liquid |
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| US7662294B1 (en) * | 2004-02-02 | 2010-02-16 | Cox Jr Henry Wilmore | Method for reducing organic contamination |
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| CN106242132A (en) * | 2016-08-30 | 2016-12-21 | 中石化石油工程机械有限公司研究院 | A kind of processing method of fracturing outlet liquid |
| CN108249635A (en) * | 2016-12-29 | 2018-07-06 | 黑龙江吉纳森生物工程股份有限公司 | Processing unit is arranged outside a kind of fracturing outlet liquid |
| CN108439712A (en) * | 2018-04-09 | 2018-08-24 | 湖北中油科昊机械制造有限公司 | A kind of oil-gas field fracturing returns drain processing method |
| CN208916977U (en) * | 2018-09-29 | 2019-05-31 | 陕西延长石油(集团)有限责任公司研究院 | Reclaiming system after a kind of processing of guar gum system fracturing outlet liquid |
| CN211056858U (en) * | 2019-11-04 | 2020-07-21 | 内蒙古恒盛环保科技工程有限公司 | Foam processing unit in flowing back processing procedure is returned in oil gas field fracturing |
-
2022
- 2022-08-18 CN CN202210985302.3A patent/CN115259470A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7662294B1 (en) * | 2004-02-02 | 2010-02-16 | Cox Jr Henry Wilmore | Method for reducing organic contamination |
| CN105064970A (en) * | 2015-08-21 | 2015-11-18 | 陕西海默油田服务有限公司 | Oil and gas well fracturing flow-back fluid treatment method |
| CN106242132A (en) * | 2016-08-30 | 2016-12-21 | 中石化石油工程机械有限公司研究院 | A kind of processing method of fracturing outlet liquid |
| CN108249635A (en) * | 2016-12-29 | 2018-07-06 | 黑龙江吉纳森生物工程股份有限公司 | Processing unit is arranged outside a kind of fracturing outlet liquid |
| CN108439712A (en) * | 2018-04-09 | 2018-08-24 | 湖北中油科昊机械制造有限公司 | A kind of oil-gas field fracturing returns drain processing method |
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| CN211056858U (en) * | 2019-11-04 | 2020-07-21 | 内蒙古恒盛环保科技工程有限公司 | Foam processing unit in flowing back processing procedure is returned in oil gas field fracturing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116177780A (en) * | 2022-12-11 | 2023-05-30 | 延安圣洋环保有限公司 | Treatment method of drilling waste liquid |
| CN116239243A (en) * | 2022-12-11 | 2023-06-09 | 延安圣洋环保有限公司 | Mixed treatment method for drilling waste liquid and fracturing flowback liquid |
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