CN110844977B - Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method - Google Patents
Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method Download PDFInfo
- Publication number
- CN110844977B CN110844977B CN201911080692.4A CN201911080692A CN110844977B CN 110844977 B CN110844977 B CN 110844977B CN 201911080692 A CN201911080692 A CN 201911080692A CN 110844977 B CN110844977 B CN 110844977B
- Authority
- CN
- China
- Prior art keywords
- cod
- treating agent
- acidified
- iron powder
- flowback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C02F1/46176—Galvanic cells
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a treating agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and a using method thereof, wherein the treating agent comprises iron powder and activated carbon, paraffin is sprayed outside the iron powder, and the mass ratio of the sum of the mass of the iron powder and the paraffin wrapped outside the iron powder to the mass of the activated carbon is 6.5-5.5. And melting paraffin on the outer surface of the iron powder to enable the iron powder and the carbon powder to generate an iron-carbon micro-electrolysis primary battery reaction in the acid solution. So as to degrade organic matters and greatly reduce COD of the acidified flowback liquid. The treating agent is directly added, so that the use of iron-carbon micro-electrolysis equipment in the treatment process of the acidification backflow liquid of the sewage treatment station is reduced, and the manufacturing and hauling cost of the acidification backflow liquid treatment equipment is greatly reduced.
Description
Technical Field
The invention relates to the field of oilfield wastewater treatment, in particular to a treatment agent for reducing COD of acidized flowback fluid and a use method thereof.
Background
The acidification is the main measure for increasing the production of oil wells and increasing the injection of water wells, and is to inject a certain type of acid liquor with certain concentration and formula acid liquor consisting of additives into the stratum according to a certain sequence to erode minerals of part of the stratum rock, or the blockage in pores and cracks, improve the permeability of the stratum or cracks, improve the seepage conditions and achieve the purpose of recovering or improving the productivity of oil and gas wells (or the injection capacity of injection wells). According to statistics, about 3000 acidizing wells are implemented in Changqing oil fields in year, and about 5 x 104m3 acidized flowback fluid is generated. The acidified flowback fluid not only contains a large amount of crude oil, suspended impurities and residual acid, but also contains inorganic ions for corroding stratum rocks and dirt substances, has strong pungent smell, has great harm to the environment and reaches the standardThe treatment process is complex and difficult, the oil cannot be discharged on the spot after being rapidly treated in a well site, the return liquid can only be discharged after being pulled and conveyed to a sewage treatment station for treatment, and at present, the acidification return liquid of each oil well is 80-150m 3 The cost of pulling is 6000-10000 yuan, and the cost is high. After the existing sewage treatment station acidification flowback liquid treatment technology is analyzed, one of the core technologies is an iron-carbon micro-electrolysis organic matter oxidation technology for oil well acidification flowback liquid with high COD, other pollutants are removed by means of coagulation, filtration and the like, and the iron-carbon micro-electrolysis organic matter oxidation technology is reused for other processes such as well site pouring, well washing and the like after reaching the treatment standard, wherein the most core process unit is the iron-carbon micro-electrolysis technology, but the iron-carbon micro-electrolysis equipment occupies a large area, has high synchronous carrying cost along with the oil well acidification equipment, cannot realize oil well acidification operation, and can treat the flowback liquid up to the standard on the spot and discharge or recycle the flowback liquid on the spot, so that the pulling and transporting cost of the acidification waste liquid is greatly reduced. Therefore, how to reduce the treatment cost of the iron-carbon micro-electrolysis treatment technology is a key problem of realizing the reduction of COD of the acidized flowback fluid of the oil well.
Disclosure of Invention
The invention aims to provide a treating agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and a using method thereof, so as to reduce the treatment cost of an iron-carbon micro-electrolysis treatment technology.
A treating agent for reducing COD of acidified flowback liquid comprises iron powder and activated carbon, wherein paraffin is sprayed on the outside of the iron powder, and the paraffin is uniformly sprayed on the surface of the iron powder in a molten state.
The mass ratio of the sum of the mass of the iron powder and the paraffin wrapped outside the iron powder to the mass of the activated carbon is 6.5-5.5.
The particle size of the iron powder is 10-40 microns.
The particle size of the active carbon is 10-40 microns.
The melting point range of the paraffin is 60-62 ℃.
A method for using a treating agent for reducing COD in acidified flowback fluid comprises the following steps,
the first step, detecting the COD of the oil well produced liquid, and determining the addition amount of a treating agent according to the COD value of the oil well produced liquid;
secondly, adding a treating agent into an acid liquor tank for acidification of an oil well according to the amount of the treating agent determined in the first step;
thirdly, acidizing, namely acidizing according to the acidizing process of the oil well;
and fourthly, detecting the flowback liquid, taking a wellhead sample at regular time after the acidification is finished and the well closing reaction is carried out for a certain time, measuring the COD value of the wellhead flowback liquid, and opening the wellhead to reversely discharge the wastewater in the shaft when the COD value reduction amplitude of the wellhead flowback liquid is measured for two times at present and is less than 5%.
In the first step, when the COD of the oil well produced liquid is less than or equal to 500mg/L, the dosage of the treating agent is 300mg/L-560mg/L; when the COD of the oil well produced liquid is more than 500mg/L and less than or equal to 1300mg/L, the dosage of the treating agent is 561mg/L-920mg/L; when the COD of the oil well produced liquid is more than 1301mg/L, the dosage of the treating agent is 921mg/L-1430mg/L.
In the second step, when the treating agent is added into the acid liquor tank for oil well acidification, the treating agent is stirred to be suspended in the acid liquor, and the stirring speed is 50-60 revolutions per minute.
And in the fourth step, the specific steps of the flow-back fluid detection are that after the well shut-in reaction is finished for 60 minutes, a wellhead sample is taken every 15 minutes, the COD value of the wellhead flow-back fluid is measured, and when the COD value of the wellhead flow-back fluid measured twice at the present time is reduced by less than 5%, the wellhead flow-back wellbore is opened to discharge waste water.
The invention has the beneficial effects that: activated carbon particles and paraffin wrapped iron powder are added into acid liquor in the acidification process and injected into a stratum and an oil well pipe column, paraffin on the outer surface of the iron powder in the acidified stratum is melted at the temperature of more than 60 ℃, and the iron powder and the activated carbon particles in the acid liquor are subjected to iron-carbon micro-electrolysis galvanic cell reaction for more than 60min, so that COD (chemical oxygen demand) of the acidified flowback fluid is greatly reduced.
Detailed Description
[ example 1 ] A method for producing a polycarbonate
A treating agent for reducing COD of acidified flowback liquid comprises iron powder and activated carbon, wherein paraffin is sprayed on the iron powder.
The mass ratio of the sum of the mass of the iron powder and the paraffin wrapped outside the iron powder to the mass of the activated carbon is 6.5-5.5.
The particle size of the iron powder is 10-40 microns.
The particle size of the active carbon is 10-40 microns.
The melting point range of the paraffin is 60-62 ℃.
The paraffin is uniformly sprayed on the surface of the iron powder in a molten state.
The preparation method comprises the steps of uniformly spraying liquid paraffin in a molten state on the surface of the iron powder, cooling the paraffin to obtain the iron powder with the paraffin coating, and mixing the iron powder with the paraffin coating with the activated carbon. The mass ratio of the sum of the paraffin and the iron powder to the activated carbon is 6.5-5.5.
Wherein the mass ratio of the sum of the paraffin and the iron powder to the activated carbon is preferably 6
[ example 2 ]
On the basis of the embodiment 1, the use method of the treating agent for acidifying the flowback liquid to reduce COD comprises the following steps,
the first step, detecting the COD of the oil well produced liquid, and determining the addition amount of a treating agent according to the COD value of the oil well produced liquid;
in the first step, when the COD of the oil well produced liquid is less than or equal to 500mg/L, the addition of the treating agent is 300mg/L-560mg/L; when the COD of the oil well produced liquid is more than 500mg/L and less than or equal to 1300mg/L, the dosage of the treating agent is 561mg/L-920mg/L; when the COD of the oil well produced liquid is more than 1301mg/L, the dosage of the treating agent is 921mg/L-1430mg/L.
Secondly, adding a treating agent into an acid liquor tank for oil well acidification according to the amount of the treating agent determined in the first step; in the second step, when the treating agent is added into the acid liquor tank for oil well acidification, the treating agent is stirred to be suspended in the acid liquor, and the stirring speed is 50-60 revolutions per minute.
Thirdly, acidizing, namely acidizing according to the acidizing process of the oil well; the treating agent is injected into the stratum and the oil pipe column together with the acid liquor.
And fourthly, detecting the flowback liquid, taking a wellhead sample at regular time after the acidification is finished and the well closing reaction is carried out for a certain time, measuring the COD value of the wellhead flowback liquid, and opening the wellhead to reversely discharge the wastewater in the shaft when the COD value reduction amplitude of the wellhead flowback liquid is measured for two times at present and is less than 5%.
And in the fourth step, the specific steps of the flow-back fluid detection are that after the well shut-in reaction is finished for 60 minutes, a wellhead sample is taken every 15 minutes, the COD value of the wellhead flow-back fluid is measured, and when the COD value of the wellhead flow-back fluid measured twice at the present time is reduced by less than 5%, the wellhead flow-back wellbore is opened to discharge waste water.
And melting paraffin on the outer surface of iron powder in an acidized formation at the temperature of over 60 ℃, and carrying out iron-carbon micro-electrolysis galvanic cell reaction on the iron powder and the carbon powder in acid liquor for over 60min to degrade organic matters, so that COD (chemical oxygen demand) of the acidized flowback fluid is greatly reduced. The treating agent is directly added, so that the use of iron-carbon micro-electrolysis equipment in the treatment process of the acidification backflow liquid of the sewage treatment station is reduced, and the manufacturing and hauling cost of the acidification backflow liquid treatment equipment is greatly reduced.
Claims (9)
1. A treating agent for reducing COD in acidified flowback fluid is characterized in that: the paraffin wax spraying agent comprises iron powder and activated carbon, wherein paraffin wax is sprayed on the outside of the iron powder, and the paraffin wax is uniformly sprayed on the surface of the iron powder in a molten state.
2. The treatment agent for reducing COD of the acidified flowback fluid according to claim 1, wherein the treatment agent comprises: the mass ratio of the sum of the mass of the iron powder and the paraffin wrapped outside the iron powder to the mass of the activated carbon is 6.5-5.5.
3. The treatment agent for reducing COD of the acidified flowback fluid according to claim 1, wherein the treatment agent comprises: the particle size of the iron powder is 10-40 microns.
4. The treatment agent for reducing COD of the acidified flowback fluid according to claim 1, wherein the treatment agent comprises: the particle size of the active carbon is 10-40 microns.
5. The treatment agent for reducing COD of the acidified flowback fluid according to claim 1, wherein the treatment agent comprises: the melting point range of the paraffin is 60-62 ℃.
6. The use method of the treating agent for reducing COD of the acidified flowback fluid according to any one of claims 1 to 5, is characterized in that: comprises the following steps of (a) preparing a solution,
the first step, detecting the COD of the oil well produced liquid, and determining the addition amount of a treating agent according to the COD value of the oil well produced liquid;
secondly, adding a treating agent into an acid liquor tank for oil well acidification according to the amount of the treating agent determined in the first step;
thirdly, acidizing, namely acidizing according to the acidizing process of the oil well;
and fourthly, detecting the flowback liquid, taking a wellhead sample at regular time after the acidification is finished and the well closing reaction is carried out for a certain time, measuring the COD value of the wellhead flowback liquid, and opening the wellhead to reversely discharge the wastewater in the shaft when the COD value reduction amplitude of the wellhead flowback liquid is measured for two times at present and is less than 5%.
7. The use method of the treating agent for reducing COD of the acidified flowback fluid according to claim 6, is characterized in that: in the first step, when the COD of the oil well produced liquid is less than or equal to 500mg/L, the addition of the treating agent is 300mg/L-560mg/L; when the COD of the oil well produced liquid is more than 500mg/L and less than or equal to 1300mg/L, the dosage of the treating agent is 561mg/L-920mg/L; when the COD of the oil well produced liquid is more than 1301mg/L, the dosage of the treating agent is 921mg/L-1430mg/L.
8. The use method of the treating agent for reducing COD in the acidified flowback fluid according to claim 6, is characterized in that: in the second step, when the treating agent is added into the acid liquor tank for oil well acidification, the treating agent is stirred to be suspended in the acid liquor, and the stirring speed is 50-60 revolutions per minute.
9. The use method of the treating agent for reducing COD in the acidified flowback fluid according to claim 6, is characterized in that: and in the fourth step, the specific steps of the flow-back fluid detection are that after the well shut-in reaction is finished for 60 minutes, a wellhead sample is taken every 15 minutes, the COD value of the wellhead flow-back fluid is measured, and when the COD value of the wellhead flow-back fluid measured twice at the present time is reduced by less than 5%, the wellhead flow-back wellbore is opened to discharge waste water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080692.4A CN110844977B (en) | 2019-11-07 | 2019-11-07 | Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080692.4A CN110844977B (en) | 2019-11-07 | 2019-11-07 | Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110844977A CN110844977A (en) | 2020-02-28 |
| CN110844977B true CN110844977B (en) | 2022-12-02 |
Family
ID=69599003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911080692.4A Active CN110844977B (en) | 2019-11-07 | 2019-11-07 | Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110844977B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288251A (en) * | 2013-06-14 | 2013-09-11 | 西安建筑科技大学 | Iron-carbon micro-electrolysis processing method and device for oil field well site acid waste water |
| CN104830367A (en) * | 2015-05-25 | 2015-08-12 | 哈尔滨工业大学 | Method for separating shale oil and water mixture by using paraffin and magnetic iron |
| CN106268644B (en) * | 2016-09-12 | 2019-02-01 | 方亚鹏 | A kind of efficient water purification material and the preparation method and application thereof |
| CN108190976B (en) * | 2017-12-29 | 2020-06-12 | 石家庄市源生园环保有限公司 | Wastewater treatment agent, preparation method and application method thereof |
-
2019
- 2019-11-07 CN CN201911080692.4A patent/CN110844977B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110844977A (en) | 2020-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102775975B (en) | Blocking remover for reservoir of oil well | |
| CN113684012B (en) | Acidizing blocking remover and preparation method thereof | |
| CN103642478A (en) | Blocking remover for removing polymer pollutants | |
| CN102559163A (en) | Chlorine dioxide compound blockage remover, as well as preparation method and use method for same | |
| CN104232041B (en) | A kind of oil-water well strong corrosion acidifying unblocking liquid of low leak-off and preparation method thereof | |
| CN106479477A (en) | A kind of encapsulating solids acid and its preparation and application | |
| CN1995269A (en) | Chemical formula and process for removing organic block adjacent to oil well area | |
| CN112251214A (en) | Stratum degradation acid and application thereof | |
| CN110242248B (en) | Sandstone reservoir water-plugging acidification process method | |
| CN110844977B (en) | Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method | |
| US2146480A (en) | Process of shutting off water or other extraneous fluid in oil wells | |
| CN104481475A (en) | Oil well carbon dioxide carbonated water throughput production increasing method | |
| CN101053799A (en) | Preparation of demulsifying agent for processing mud and sand containing oil and its processing method | |
| CN106507863B (en) | In in-situ leaching uranium, augmented injection method is taken out in the increasing of wellhole | |
| CN111574981B (en) | Blocking remover for oil field and preparation method thereof | |
| CN101914373B (en) | Horizontal well biology yield increasing solution | |
| CN107540028B (en) | Polysulfonate drilling waste harmless treatment agent and preparation method and application thereof | |
| CN108949132A (en) | A method of for the solid sand de-plugging treatment fluid of fine silt oil reservoir sand control, sand control treatment fluid system and with its sand control | |
| CN112877046B (en) | Deep thickened oil blocking remover for oil well and preparation method and application method thereof | |
| CN102899014A (en) | Fiber steering acid | |
| CN109209268A (en) | The method that drain is returned in acidification is handled using reproducibility iron powder | |
| CN104803539A (en) | Polysulfonate drilling liquid waste treatment method for Yanchang Petroleum sour gas field | |
| CN102086085A (en) | Method for solidifying drilling waste slurry | |
| CN112031721A (en) | Atomized acid acidification method suitable for improving oil field stratum permeability | |
| Yang et al. | Research and application of pressure decreasing technology of polymer material injection wells |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |