CN1300017C - Tech. process for reducing mineralization of extracting oil sewage - Google Patents
Tech. process for reducing mineralization of extracting oil sewage Download PDFInfo
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- CN1300017C CN1300017C CNB2005100098956A CN200510009895A CN1300017C CN 1300017 C CN1300017 C CN 1300017C CN B2005100098956 A CNB2005100098956 A CN B2005100098956A CN 200510009895 A CN200510009895 A CN 200510009895A CN 1300017 C CN1300017 C CN 1300017C
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Abstract
The present invention relates to a technologic method for lowering the mineralization degree of oil production sewage. The technologic method comprises the brief steps that highly mineralized water containing oil and polymers in oil fields is coagulated, deposited, treated through air flotation and filtered for preliminary treatment, and then the highly mineralized water is loaded into circulating membrane equipment; under the conditions of set working pressure, flow speed, cleaning period, cleaning medicine and cleaning condition, advanced treatment is carried out to the highly mineralized water; treated water is loaded into nanometer modified ion exchange membrane equipment and is treated to lower the mineralization degree at set working voltage; desalted water is loaded into a polymer preparation station and recycled for preparing polymers. The circulating membrane treatment equipment adopted by the method can make the production rate of clear water raised to be more than 95%, the service life of membranes can be four to six years, and membrane flux is increased by 20% to 30%. Nanometer modified ion exchange membranes have strong anti-pollution performance, the service life of the nanometer modified ion exchange membranes can be extended by one to two years, and the water production rate of the nanometer modified ion exchange membrane equipment is more than 80%; compared with reverse osmosis equipment, the nanometer modified ion exchange membrane equipment with the same water production capacity reduces the cost by 30% to 50%.
Description
Technical field
The invention belongs to water treatment method, especially relate to oilfield produced water and fall the salinity method.
Background technology
Development along with displacement of reservoir oil production technique, the most of oil-field development of China progresses into the ripening stage, the consequent is rolling up of oil field extracted water, from the early production period 10-20% be increased to present 80-90%, meanwhile, people become to environment protection and more and more pay attention to, and make recovered water arbitrarily not discharge; On the other hand, each oil field has begun to use multipolymer to drive production technique for excavating the oil reservoir potentiality, needs a large amount of low mineralization clear water and prepare these medicaments.
It is to adopt pre-treatment to add reverse osmosis that the salinity treatment process falls in present existing oilfield produced water.Pretreatment process comprises coagulation, precipitation, air supporting and filtration, and these pretreatment processs can most of oils, polymkeric substance, suspended particle and impurity of removing in the oil extraction-generated waste water, and handling for follow-up reverse osmosis desalination provides influent quality preferably.The reverse osmosis effluent quality is good, satisfy prepared polymer fully and drive the water requirement, but its maximum weak point is that processing cost is too high, is difficult in the disposing polluted water in oil and promotes.
Summary of the invention
The objective of the invention is to overcome the weak point that exists in the above-mentioned technology, the sustainable exploitation in a kind of assurance oil field, conserve water resource are provided, the protection water surrounding guarantees that the salinity processing method falls in the eucyclic oil extraction-generated waste water of oil-field water system.
In order to achieve the above object, the technical solution used in the present invention is that pre-treatment adds circulation film advanced treatment and adds nanometer modified ion exchange membrane desalting treatment:
A, pre-treatment
Oil extraction-generated waste water is sent into the natural subsidence jar, after stopping 10-24 hour, enter the coagulant precipitation jar, dosing coagulant carries out coagulating sedimentation to be handled, effectively residence time 5-12 hour, the water outlet of coagulant precipitation jar is sent into air flotation pool and is handled, the control reflux ratio is 0.1-0.5, dissolved-air pressure is a 1-5 normal atmosphere, water after air flotation pool is handled enters one-level individual layer quartz sand filtration device, keep filtering velocity 3-8 rice/hour, back washing strength 10-15 liter/second square metre, backwashing period 24-48 hour, backwashing time 10-20 minute, the water outlet of one-level individual layer quartz sand filtration device enters secondary individual layer quartz sand filtration device and filters, filtering velocity 2-6 rice/hour, back washing strength 10-15 liter/second square metre, backwashing period 24-48 hour, backwashing time 10-20 minute, secondary individual layer quartz sand filtration device treating water is pumped into the circulation film carry out advanced treatment, further remove remaining oil, turbidity and polymkeric substance.
B, circulation film advanced treatment
From the water after the processing of secondary individual layer quartz sand filtration device, send into circulation film treatment facility by lift pump, working pressure in the 0.02-0.60 MPa, 0.1-12 under the circulation velocity of meter per second, further remove oil, turbidity and polymkeric substance, the dense water that produces after the circulation film device is handled sends back to the circulation film device again, again handle again, so dense water is carried out repeated treatments, the clear water that after the circulation film is handled, obtains, deliver in the nano modification ion-exchange film device and carry out desalting treatment, after 1-48 hour, need carry out matting to film device, scavenging period 0.1-1 hour in the operation of circulation film.
C, nano modification ion-exchange membrane are handled
Treating water after the circulation film handled is sent into the nano modification ion-exchange membrane, carries out desalting treatment under the operating voltage of 5-200 volt, and the fresh water after the desalination utilizes water pump to send into match polymer station to be used for prepared polymer solution.
2. the pre-treatment coagulating agent comprises polymeric aluminum, dosage 10-100 mg/litre; Polymerization iron, dosage 10-100 mg/litre.
3. the circulation film device comprises circulation microfiltration membrane, loop ultrafiltration film and circulation nanofiltration membrane.
4. circulation film device matting medicament is alkaline wash, tensio-active agent and pickle solution.Cleaning process: greasy dirt and the adsorption particle of at first removing the film surface with surfactant washing, scavenging period 5-60 minute, clean the gel coat of removing the film surface with alkaline wash then, scavenging period 5-60 minute, at last with the inorganic foulants in pickle solution removal film surface-area and the fenestra, scavenging period 5-60 minute.Alkaline wash is 1% (mass percent) sodium hydroxid, tensio-active agent comprises: 1% (mass percent) Sodium dodecylbenzene sulfonate, 1% (volume percent) nonionogenic tenside-polyoxyethylene alkylphenol ether (OP-10), pickle solution comprise 1% (mass percent) oxalic acid, 0.5% (volume percent) hydrochloric acid.
5. the nano modification ion-exchange membrane is to add nano material AL in ion-exchange membrane
2O
3The prepared antipollution ion-exchange membrane of modification.
Advantage of the present invention is:
1, the present invention is applicable to that salinity falls the salinity waste water treating and reutilizing at 1000-7000 mg/litre oil extraction-generated waste water;
2, the circulation film device of this process using adopts the concentrated solution reflux operation, thereby the clear water productive rate is more much higher than the productive rate of hollow-fibre membrane 60-85% up to more than 95%, has reduced concentrated water discharge when increasing the clear water productive rate;
3, the circulation film cross-flow operation of this process using, the film surface is washed away in continuous high speed (0.1-12 meter per second) circulation by feed liquid, reduces the deposition of pollutent on the film surface, alleviates film and pollutes, film can reach 4-6 work-ing life, and membrane flux has on average improved 20-30%;
4, circulation film treatment facility provides good protection for follow-up nano modification ion-exchange membrane;
5, the nano modification ion-exchange membrane can not only alleviate the absorption of organism such as oils, polymkeric substance on the film surface, improve the film contamination resistance, can also improve simultaneously the physical strength of film self, can prolong 1-2 by the ion-exchange membrane lifetime behind the nano modification, the producing water ratio of equipment reaches more than 80%;
6, this processing method, reverse osmosis relatively, the cost of equipment of identical water production rate hangs down 30-50%, and the specific yield energy consumption is 0.8 degree/ton water;
7, this processing method does not produce the waste gas waste residue;
8, this processing method level of automation height, operational management is easy;
9, this processing method had both been eliminated big source of pollution, again for polymer flooding has solved water resources problem, had realized the benign cycle of oil recovery process water system, had guaranteed the sustainable exploitation in oil field.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1
Handle 500 tons of oil extraction-generated waste waters every day, oil extraction-generated waste water is sent into the natural subsidence jar, after stopping 10 hours, enter the coagulant precipitation jar, add 10 mg/litre polymeric aluminum and carry out the coagulating sedimentation processing, effectively 5 hours residence time, the water outlet of coagulant precipitation jar is sent into air flotation pool and is handled, the control reflux ratio is 0.1, and dissolved-air pressure is 1 normal atmosphere.Water after air flotation pool is handled enters one-level individual layer quartz sand filtration device, keeps 3 meters/hour of filtering velocitys, 10 liters/second square metres of back washing strengths, backwashing period 24 hours, backwashing time 10 minutes.The water outlet of one-level individual layer quartz sand filtration device enters secondary individual layer quartz sand filtration device and filters, 2 meters/hour of filtering velocitys, 10 liters/second square metres of back washing strengths, backwashing period 24 hours, backwashing time 10 minutes.Secondary individual layer quartz sand filtration device treating water is pumped into the circulation film carry out advanced treatment, further remove remaining oil, turbidity and polymkeric substance.
Water after handling from secondary individual layer quartz sand filtration device is sent into circulation film treatment facility by lift pump, under the circulation velocity of the working pressure of 0.25 MPa, 3.0 meter per seconds, further removes oil, turbidity and polymkeric substance.During the work of circulation film device, the dense water that the wherethrough reason produces is not directly to drain, and carries out circular treatment but send back to the circulation film device again, by continuous circular treatment, reaches the purpose of the producing water ratio of raising equipment.After 10 hours, need carry out matting in the operation of circulation film, adopt 1% Sodium dodecylbenzene sulfonate to clean during cleaning earlier 5 minutes, and then adopt 1% sodium hydroxid to clean 5 minutes, clean 5 minutes with 1% oxalic acid at last film device.Circulation film device after cleaning finishes reruns, and carries out and above-mentioned same operating process.Treating water after handling is sent into the nano modification ion-exchange membrane carry out desalting treatment.
Treating water after the circulation film is handled enters the nano modification ion-exchange membrane, carries out desalting treatment under 70 volts operating voltage, and the fresh water after the desalination utilizes water pump to send into match polymer station to be used for prepared polymer solution.The nano modification ion-exchange membrane that desalting treatment is used is by add nano material AL in ion-exchange membrane
2O
3Modification makes, because AL
2O
3Be the high-hydrophilic inorganics, thus organism such as hydrophobic oils, polymkeric substance there is very strong anti-adsorptivity, thereby can alleviate the film pollution, improve membrane flux; Owing to the adding of nano material, improved the physical strength of film self simultaneously, this plays a very important role for the tool in work-ing life that prolongs film.
Embodiment 2
Handle 1000 tons of oil extraction-generated waste waters every day, oil extraction-generated waste water is sent into the natural subsidence jar, after stopping 15 hours, enter the coagulant precipitation jar, add 50 mg/litre polymeric aluminum and carry out the coagulating sedimentation processing, effectively 7 hours residence time, the water outlet of coagulant precipitation jar is sent into air flotation pool and is handled, the control reflux ratio is 0.2, and dissolved-air pressure is 2 normal atmosphere.Water after air flotation pool is handled enters one-level individual layer quartz sand filtration device, keeps 5 meters/hour of filtering velocitys, 12 liters/second square metres of back washing strengths, backwashing period 30 hours, backwashing time 15 minutes.The water outlet of one-level individual layer quartz sand filtration device enters secondary individual layer quartz sand filtration device and filters, 4 meters/hour of filtering velocitys, 12 liters/second square metres of back washing strengths, backwashing period 30 hours, backwashing time 12 minutes.Secondary individual layer quartz sand filtration device treating water is pumped into the circulation film carry out advanced treatment, further remove remaining oil, turbidity and polymkeric substance.
Water after handling from secondary individual layer quartz sand filtration device is sent into circulation film treatment facility by lift pump, under the circulation velocity of the working pressure of 0.35 MPa, 4.0 meter per seconds, further removes oil, turbidity and polymkeric substance.During the work of circulation film device, the dense water that the wherethrough reason produces is not directly to drain, and carries out circular treatment but send back to the circulation film device again, by continuous circular treatment, reaches the purpose of the producing water ratio of raising equipment.After 24 hours, need carry out matting in the operation of circulation film, adopt 1%OP-10 to clean during cleaning earlier 15 minutes, and then adopt 1% sodium hydroxid to clean 10 minutes, clean 10 minutes with 1% oxalic acid at last film device.Circulation film device after cleaning finishes reruns, and carries out and above-mentioned same operating process.Treating water after handling is sent into the nano modification ion-exchange membrane carry out desalting treatment.
Treating water after the circulation film is handled enters the nano modification ion-exchange membrane, carries out desalting treatment under 90 volts operating voltage, and the fresh water after the desalination utilizes water pump to send into match polymer station to be used for prepared polymer solution.
Embodiment 3
Handle 5000 tons of oil extraction-generated waste waters every day, oil extraction-generated waste water is sent into the natural subsidence jar, after stopping 20 hours, enter the coagulant precipitation jar, add 50 mg/litre polymerization iron and carry out the coagulating sedimentation processing, effectively 10 hours residence time, the water outlet of coagulant precipitation jar is sent into air flotation pool and is handled, the control reflux ratio is 0.4, and dissolved-air pressure is 4 normal atmosphere.Water after air flotation pool is handled enters one-level individual layer quartz sand filtration device, keeps 6 meters/hour of filtering velocitys, 14 liters/second square metres of back washing strengths, backwashing period 40 hours, backwashing time 20 minutes.The water outlet of one-level individual layer quartz sand filtration device enters secondary individual layer quartz sand filtration device and filters, 5 meters/hour of filtering velocitys, 14 liters/second square metres of back washing strengths, backwashing period 40 hours, backwashing time 15 minutes.Secondary individual layer quartz sand filtration device treating water is pumped into the circulation film carry out advanced treatment, further remove remaining oil, turbidity and polymkeric substance.
Water after handling from secondary individual layer quartz sand filtration device is sent into circulation film treatment facility by lift pump, under the circulation velocity of the working pressure of 0.50 MPa, 10.0 meter per seconds, further removes oil, turbidity and polymkeric substance.During the work of circulation film device, the dense water that the wherethrough reason produces is not directly to drain, and carries out circular treatment but send back to the circulation film device again, by continuous circular treatment, reaches the purpose of the producing water ratio of raising equipment.After 40 hours, need carry out matting in the operation of circulation film, adopt 1% Sodium dodecylbenzene sulfonate to clean during cleaning earlier 25 minutes, and then adopt 1% sodium hydroxid to clean 15 minutes, clean 15 minutes with 0.5% hydrochloric acid at last film device.Circulation film device after cleaning finishes reruns, and carries out and above-mentioned same operating process.Treating water after handling is sent into the nano modification ion-exchange membrane carry out desalting treatment.
Treating water after the circulation film is handled enters the nano modification ion-exchange membrane, carries out desalting treatment under 110 volts operating voltage, and the fresh water after the desalination utilizes water pump to send into match polymer station to be used for prepared polymer solution.
Embodiment 4
Handle 10000 tons of oil extraction-generated waste waters every day, oil extraction-generated waste water is sent into the natural subsidence jar, after stopping 24 hours, enter the coagulant precipitation jar, add 100 mg/litre polymerization iron and carry out the coagulating sedimentation processing, effectively 12 hours residence time, the water outlet of coagulant precipitation jar is sent into air flotation pool and is handled, the control reflux ratio is 0.5, and dissolved-air pressure is 5 normal atmosphere.Water after air flotation pool is handled enters one-level individual layer quartz sand filtration device, keeps 8 meters/hour of filtering velocitys, 15 liters/second square metres of back washing strengths, backwashing period 48 hours, backwashing time 20 minutes.The water outlet of one-level individual layer quartz sand filtration device enters secondary individual layer quartz sand filtration device and filters, 6 meters/hour of filtering velocitys, 15 liters/second square metres of back washing strengths, backwashing period 48 hours, backwashing time 20 minutes.Secondary individual layer quartz sand filtration device treating water is pumped into the circulation film carry out advanced treatment, further remove remaining oil, turbidity and polymkeric substance.
Water after handling from secondary individual layer quartz sand filtration device is sent into circulation film treatment facility by lift pump, under the circulation velocity of the working pressure of 0.60 MPa, 12.0 meter per seconds, further removes oil, turbidity and polymkeric substance.During the work of circulation film device, the dense water that the wherethrough reason produces is not directly to drain, and carries out circular treatment but send back to the circulation film device again, by continuous circular treatment, reaches the purpose of the producing water ratio of raising equipment.After 48 hours, need carry out matting in the operation of circulation film, adopt 1% Sodium dodecylbenzene sulfonate to clean during cleaning earlier 25 minutes, and then adopt 1% sodium hydroxid to clean 20 minutes, clean 20 minutes with 1% oxalic acid at last film device.Circulation film device after cleaning finishes reruns, and carries out and above-mentioned same operating process.Treating water after handling is sent into the nano modification ion-exchange membrane carry out desalting treatment.
Treating water after the circulation film is handled enters the nano modification ion-exchange membrane, carries out desalting treatment under 110 volts operating voltage, and the fresh water after the desalination utilizes water pump to send into match polymer station to be used for prepared polymer solution.
Claims (5)
1. the salinity processing method falls in oil extraction-generated waste water, it is characterized in that:
A, pre-treatment
Oil extraction-generated waste water is sent into the natural subsidence jar, after stopping 10-24 hour, enter the coagulant precipitation jar, dosing coagulant carries out coagulating sedimentation to be handled, effectively residence time 5-12 hour, the water outlet of coagulant precipitation jar is sent into air flotation pool and is handled, the control reflux ratio is 0.1-0.5, dissolved-air pressure is a 1-5 normal atmosphere, water after air flotation pool is handled enters one-level individual layer quartz sand filtration device, keep filtering velocity 3-8 rice/hour, back washing strength 10-15 liter/second square metre, backwashing period 24-48 hour, backwashing time 10-20 minute, the water outlet of one-level individual layer quartz sand filtration device entered secondary individual layer quartz sand filtration device and filters, filtering velocity 2-6 rice/hour, back washing strength 10-15 liter/second square metre, backwashing period 24-48 hour, backwashing time 10-20 minute, secondary individual layer quartz sand filtration device treating water is pumped into the circulation film carry out advanced treatment, further remove remaining oil, turbidity and polymkeric substance
B, circulation film advanced treatment
From the water after the processing of secondary individual layer quartz sand filtration device, send into circulation film treatment facility by lift pump, working pressure in the 0.02-0.60 MPa, 0.1-12 under the circulation velocity of meter per second, further remove oil, turbidity and polymkeric substance, the dense water that produces after the circulation film device is handled sends back to the circulation film device again, again handle again, so dense water is carried out repeated treatments, the clear water that after the circulation film is handled, obtains, deliver in the nano modification ion-exchange film device and carry out desalting treatment, after 1-48 hour, need carry out matting film device in the operation of circulation film, scavenging period 0.1-1 hour
C, nano modification ion-exchange membrane are handled
Treating water after the circulation film handled is sent into the nano modification ion-exchange membrane, carries out desalting treatment under the operating voltage of 5-200 volt, and the fresh water after the desalination utilizes water pump to send into match polymer station to be used for prepared polymer solution.
2. the salinity processing method falls in oil extraction-generated waste water according to claim 1, it is characterized in that the pre-treatment coagulating agent comprises polymeric aluminum, dosage 10-100 mg/litre, or polymerization iron, dosage 10-100 mg/litre.
3. the salinity processing method falls in oil extraction-generated waste water according to claim 1, and the film device that it is characterized in that circulating comprises circulation microfiltration membrane, loop ultrafiltration film and circulation nanofiltration membrane.
4. the salinity processing method falls in oil extraction-generated waste water according to claim 1, the film device matting medicament that it is characterized in that circulating is a tensio-active agent, alkaline wash and pickle solution, cleaning process: greasy dirt and the adsorption particle of at first removing the film surface with surfactant washing, scavenging period 5-60 minute, clean the gel coat of removing the film surface with alkaline wash then, scavenging period 5-60 minute, at last with the inorganic foulants in pickle solution removal film surface-area and the fenestra, scavenging period 5-60 minute, alkaline wash is 1% (mass percent) sodium hydroxid, tensio-active agent is 1% (mass percent) Sodium dodecylbenzene sulfonate or 1% (volume percent) nonionogenic tenside-polyoxyethylene alkylphenol ether (OP-10), and pickle solution is 1% (mass percent) oxalic acid or 0.5% (volume percent) hydrochloric acid.
5. the salinity processing method falls in oil extraction-generated waste water according to claim 1, it is characterized in that the nano modification ion-exchange membrane is to add nano material AL in ion-exchange membrane
2O
3The prepared antipollution ion-exchange membrane of modification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100098956A CN1300017C (en) | 2005-04-14 | 2005-04-14 | Tech. process for reducing mineralization of extracting oil sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100098956A CN1300017C (en) | 2005-04-14 | 2005-04-14 | Tech. process for reducing mineralization of extracting oil sewage |
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| Publication Number | Publication Date |
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| CN1693239A CN1693239A (en) | 2005-11-09 |
| CN1300017C true CN1300017C (en) | 2007-02-14 |
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| CNB2005100098956A Expired - Fee Related CN1300017C (en) | 2005-04-14 | 2005-04-14 | Tech. process for reducing mineralization of extracting oil sewage |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332889C (en) * | 2005-12-02 | 2007-08-22 | 郑宏 | Film precision filtering method of oil extracting sewage |
| CN102491556B (en) * | 2011-12-02 | 2013-10-30 | 神华集团有限责任公司 | Coal liquefaction cyanide-containing sewage treatment system and treatment method |
| CN102992504A (en) * | 2012-12-18 | 2013-03-27 | 中国石油天然气股份有限公司 | Process for reducing mineralization degree of oily sewage in oil field |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1982004435A1 (en) * | 1981-06-17 | 1982-12-23 | Romec Environmental Res & Dev | Process and apparatus for recovering usable water and other materials from oil field mud/waste pits |
| US5433863A (en) * | 1993-11-17 | 1995-07-18 | Nalco Chemical Company | Method for clarifying wastewater containing surfactants |
| CN1355143A (en) * | 2000-11-28 | 2002-06-26 | 中国科学院生态环境研究中心 | Process and equipment for treating sewage in oil field |
| CN1381410A (en) * | 2002-06-03 | 2002-11-27 | 大庆东昊投资有限公司 | Process for treating and reclaiming polymer-contained sewage |
| CN1451610A (en) * | 2002-04-17 | 2003-10-29 | 凯能高科技工程（上海）有限公司 | Method for deeper treatment and reuse of oil production waste water in oil field by membrane separation |
-
2005
- 2005-04-14 CN CNB2005100098956A patent/CN1300017C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1982004435A1 (en) * | 1981-06-17 | 1982-12-23 | Romec Environmental Res & Dev | Process and apparatus for recovering usable water and other materials from oil field mud/waste pits |
| US5433863A (en) * | 1993-11-17 | 1995-07-18 | Nalco Chemical Company | Method for clarifying wastewater containing surfactants |
| CN1355143A (en) * | 2000-11-28 | 2002-06-26 | 中国科学院生态环境研究中心 | Process and equipment for treating sewage in oil field |
| CN1451610A (en) * | 2002-04-17 | 2003-10-29 | 凯能高科技工程（上海）有限公司 | Method for deeper treatment and reuse of oil production waste water in oil field by membrane separation |
| CN1381410A (en) * | 2002-06-03 | 2002-11-27 | 大庆东昊投资有限公司 | Process for treating and reclaiming polymer-contained sewage |
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