CN104710034A - Advanced treatment method for oilfield produced water - Google Patents
Advanced treatment method for oilfield produced water Download PDFInfo
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- CN104710034A CN104710034A CN201410537461.2A CN201410537461A CN104710034A CN 104710034 A CN104710034 A CN 104710034A CN 201410537461 A CN201410537461 A CN 201410537461A CN 104710034 A CN104710034 A CN 104710034A
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- water
- aeration
- oil field
- ultrafiltration
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Abstract
The invention relates to the technical field of water treatment, specifically relates to and discloses an advanced treatment method for oilfield produced water. The method comprises the following steps: pretreating the oilfield produced water, and then carrying out cooling; adding a coagulant and carrying out uniform mixing; pumping the obtained mixture into a submerged ultrafiltration device for ultrafiltration treatment, wherein the upper part of a membrane pool of the submerged ultrafiltration device is provided with an overflow port; in virtue of the manner of combined microporous aeration and perforated aeration, allowing trace oil and foreign matters in wastewater to overflow and to be discharged from the overflow port via the microporous aeration and removing pollutants adhered on the surface of the membrane pool via the perforated aeration; and allowing the ultrafiltration effluent to be used as reinjection water for a low-permeability oilfield, and allowing ultrafiltration concentrated water to return to the pretreatment process. The advanced treatment method for the oilfield produced water provided by the invention adopts a combination of submerged ultrafiltration technology and aeration methods to deeply treat the oilfield produced water; the effluent water quality is stable and is superior to 5-1-1 water quality standards for injection water of an extra-low permeability oilfield; and the method has the advantages of low cost and stable effluent water quality and membrane operation flux.
Description
Technical field
The present invention relates to water-treatment technology field, particularly relate to a kind of method for deeply treating water extracted out from oil field.
Background technology
According to oil and gas industry standard SY/T 5325-94, low permeability oil field injection water quality should reach " 8-3-2 " index (i.e. oil quality concentration≤8 mg/L of A3, Gu grain mass concentration≤3 mg/L, median particle size≤2 μm), " 5-1-1 " standard (i.e. oil quality concentration≤5 mg/L should be performed for super low percolation oilfield injection water quality, Gu grain mass concentration≤1 mg/L, median particle size≤1 μm).Oil field extracted water is after tradition " old three covers " art breading, and suspension content, median particle size are all difficult to reach A grade standard, can not meet the requirement of tight and supertight oil fields to re-injection.
Separation accuracy is high, running can the feature such as automatization owing to having for membrane separation technique, in oil field extracted water etc., have report.The patent of invention being 201210587924.7 as number of patent application adopts by pre-treatment and pottery membrane-bound method process oil field extracted water, its shortcoming oil extraction waste water directly enters ceramic membrane treatment unit after subsider, pretreating effect is poor, film seriously polluted, and cost is higher.Application number is the combination process that patent discloses employing active bio mud-biomembrance process and ultrafiltration of 200910073012.6, application number be 200820123389.9 and 201010511439.2 patent openly adopt the method for the advanced desalination of pre-treatment+ultra-filtration membrane+reverse osmosis membrane, all do not fully take into account oil field water outlet complicated component, especially oleaginousness is comparatively large, and running the steady and continuous of film processing system has considerable influence.
Summary of the invention
There is for prior art oil field extracted water embrane method treating processes the defect that cost is high, fouling membrane is serious, the invention provides that a kind of cost is low, the method for treating water cut out from oil field of stable water outlet and device.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method for deeply treating water extracted out from oil field, is characterized in that: comprise the steps:
1) oil field extracted water water quality after pre-treatment reaches: oleaginousness is less than 30mg/L, suspended substance is less than 40mg/L, then through cooling process, after cooling, temperature is lower than 45 DEG C;
2) in the waste water of step 1) gained, add coagulated agent, and carry out Homogeneous phase mixing process;
3) by step 2) waste water of gained passes into immersion ultra-filtration equipment and carries out uf processing, the membrane cisterna top of described immersion ultra-filtration equipment arranges overflow port, the mode that micro-pore aeration and boring aeration combine is adopted in process of ultrafiltration treatment, by micro-pore aeration, micro oil in waste water and impurity are discharged from overflow port overflow, the pollutent being attached to film silk surface is removed by boring aeration, ultra-filtration water uses as low-permeability oilfield reinjected water, water quality reaches: oil quality concentration≤5 mg/L, Gu grain mass concentration≤1 mg/L, median particle size≤1 μm, the dense water of ultrafiltration returns and enters step 1) continuation preprocessing process.
The large problem of oil field extracted water oleaginousness can be made effectively to be solved by the process of ultrafiltration aeration overflow, ensure that the steady and continuous of film processing system is run, water is produced in the ultrafiltration that stably can be met the standard of 5.1.1 in SY/T 5325-94 by the process of three steps, meet the service requirements of low-permeability oilfield reinjected water, can saving water resource.
As preferably, described micro-pore aeration is successive type aeration, and aeration rate is 50-100L/m
2, micropore size is 50-150um, and boring aeration adopts gap period aeration, and aeration rate is 0.6-1.5m
3/ m
2, the boring aeration one-period time length is 1-15min, and gap period is 10-30min, and the diameter of solarization air cap is 5-10mm.The object of micropore continuous aeration produces low discharge small bubbles, oil droplet overflow tiny in waste water discharged on the one hand, also the flco that coagulation produces is promoted to liquid level overflow in addition and discharges.By micro-pore aeration, the overflow port of part pollutent from membrane cisterna top is got rid of, reduce the pollutent of membranous system.The pollutent being attached to film silk surface is cleaned by the air water stream formed by the boring aeration of periodicity large discharge, improves the stability of film operating flux.
As preferably, the preprocessing process described in step 1) comprises one or more combinations of oil removal, coagulation, mechanical filter, and described cooling process can use heat exchanger, cooling tower.By pre-treatment, the operating load of submerged membrane system can be reduced, reduce the pollution of film.
As preferably, step 2) described in coagulated agent be polymerize aluminum chloride (PAC), polyacrylamide (PAM), the one of emulsion splitter or combination.By adding coagulated agent, water-borne glue body material and other macromolecular subsidence effects can be accelerated.
As preferably, described in step 3), the membrane module of immersion ultra-filtration equipment is hollow-fibre membrane.
As preferably, the film silk of described hollow-fibre membrane is enhancement type ultrafiltration membrane filaments, and tensile strength is greater than 10MPa, comprises fiber reinforcement type, braided tube enhancement type and thermic phase enhancement type film silk.Avoid the generation of fracture of wire phenomenon in film device operational process, ensure that the product water quality stabilizing of device.
As preferably, described enhancement type ultrafiltration membrane filaments material is polyvinyladine floride (PVDF), polyvinyl chloride (PVC), polysulfones (PS), polyethersulfone (PES), polytetrafluoroethylene (PTFE).
As preferably, the pore size filter of described enhancement type ultrafiltration membrane filaments is less than 0.1 micron.
A kind of method for deeply treating water extracted out from oil field of the present invention, adopt immersion ultra-filtration technique in conjunction with aeration method to oil field extracted water advanced treatment, stable effluent quality, be better than super low percolation oilfield injection water quality " 5-1-1 " standard (i.e. oil quality concentration≤5 mg/L, Gu grain mass concentration≤1 mg/L, median particle size≤1 μm), have that cost is low, effluent quality and a stable advantage of film operating flux.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment of the present invention equipment therefor.
Embodiment
Below in conjunction with Fig. 1 and embodiment, the present invention is described further.
Device is as shown in Figure 1 adopted to carry out oil field extracted water advanced treatment.Oil field extracted water advanced treatment apparatus comprises pretreatment unit 1, cooling tower 2, line mixer 3, immersion ultra-filtration equipment 4 successively, wherein immersion ultra-filtration equipment 4 comprises the membrane module 6 in membrane cisterna 5, membrane cisterna 5, the aerating apparatus 7 bottom membrane cisterna 5, backwashing system 8, water production system 9, produces water tank 10, membrane cisterna 5 top arranges overflow port 11, also has online chemicals dosing plant 12 to be connected between cooling tower 2, line mixer 3.
Oil field extracted water after pretreatment unit 1 carries out oil removal, coagulation, mechanical filter, main water-quality guideline: oleaginousness is 20mg/L, suspended substance 30mg/L.Then, lower the temperature through cooling tower 2 and process, water temperature is down to 40 DEG C by 70 DEG C.In waste water, polymerize aluminum chloride (PAC) medicament is dropped into by online chemicals dosing plant 12, concentration is 15ppm, immersion ultra-filtration equipment 4 is directly entered after line mixer 3, the membrane module 6 placed in immersed ultrafiltration membrane pond 5 is submerged hollow fibre membrane module in bioreactor, submerged hollow fibre membrane module in bioreactor adopts fiber reinforcement type ultrafiltration membrane filaments, its tensile strength is greater than 10MPa, and membrane material is polyvinyladine floride (PVDF), and pore size filter is 0.01 micron.Under the effect of water production system vacuum primingpump, ultra filtration drainage enters and produces water tank 10.The mode that aerating apparatus 7 adopts micro-pore aeration and boring aeration to combine mutually is: micro-pore aeration successive type aeration, and aeration rate selects 70L/m
2, micropore size is 100um: boring aeration adopts gap period aeration, and aeration rate selects 15m
3/ m
2, the boring aeration one-period time length is 10min, and gap period is 20min, and the diameter of solarization air cap selects 8mm.
System stable effluent quality, is better than super low percolation oilfield injection water quality " 5-1-1 " standard (i.e. oil quality concentration≤5 mg/L, Gu grain mass concentration≤1 mg/L, median particle size≤1 μm), is directly used in re-injection.
Be only preferred embodiment of the present invention in sum, be not used for limiting practical range of the present invention, all equivalences done according to the content of the application's the scope of the claims change and modify, and all should be technology category of the present invention.
Claims (8)
1. a method for deeply treating water extracted out from oil field, is characterized in that: comprise the steps:
1) oil field extracted water water quality after pre-treatment reaches: oleaginousness is less than 30mg/L, suspended substance is less than 40mg/L, then through cooling process, after cooling, temperature is lower than 45 DEG C;
2) in the waste water of step 1) gained, add coagulated agent, and carry out Homogeneous phase mixing process;
3) by step 2) waste water of gained passes into immersion ultra-filtration equipment and carries out uf processing, the membrane cisterna top of described immersion ultra-filtration equipment arranges overflow port, the mode that micro-pore aeration and boring aeration combine is adopted in process of ultrafiltration treatment, by micro-pore aeration, micro oil in waste water and impurity are discharged from overflow port overflow, the pollutent being attached to film silk surface is removed by boring aeration, ultra-filtration water uses as low-permeability oilfield reinjected water, water quality reaches: oil quality concentration≤5 mg/L, Gu grain mass concentration≤1 mg/L, median particle size≤1 μm, the dense water of ultrafiltration returns and enters step 1) continuation preprocessing process.
2. a kind of method for deeply treating water extracted out from oil field according to claim 1, is characterized in that: described micro-pore aeration is successive type aeration, and aeration rate is 50-100L/m
2, micropore size is 50-150um, and boring aeration adopts gap period aeration, and aeration rate is 0.6-1.5m
3/ m
2, the boring aeration one-period time length is 1-15min, and gap period is 10-30min, and the diameter of solarization air cap is 5-10mm.
3. a kind of method for deeply treating water extracted out from oil field according to claim 1, it is characterized in that: the preprocessing process described in step 1) comprises one or more combinations of oil removal, coagulation, mechanical filter, and described cooling process can use heat exchanger, cooling tower.
4. a kind of method for deeply treating water extracted out from oil field according to claim 1, is characterized in that: step 2) described in coagulated agent be polymerize aluminum chloride, polyacrylamide, the one of emulsion splitter or combination.
5. a kind of method for deeply treating water extracted out from oil field according to claim 1, is characterized in that: described in step 3), the membrane module of immersion ultra-filtration equipment is hollow-fibre membrane.
6. a kind of method for deeply treating water extracted out from oil field according to claim 5, it is characterized in that: the film silk of described hollow-fibre membrane is enhancement type ultrafiltration membrane filaments, tensile strength is greater than 10MPa, comprises fiber reinforcement type, braided tube enhancement type and thermic phase enhancement type film silk.
7. a kind of method for deeply treating water extracted out from oil field according to claim 6, is characterized in that: described enhancement type ultrafiltration membrane filaments material is polyvinyladine floride, polyvinyl chloride, polysulfones, polyethersulfone, polytetrafluoroethylene.
8. a kind of method for deeply treating water extracted out from oil field according to claim 6, is characterized in that: the pore size filter of described enhancement type ultrafiltration membrane filaments is less than 0.1 micron.
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|---|---|---|---|
| CN201410537461.2A CN104710034A (en) | 2014-10-14 | 2014-10-14 | Advanced treatment method for oilfield produced water |
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| CN201410537461.2A CN104710034A (en) | 2014-10-14 | 2014-10-14 | Advanced treatment method for oilfield produced water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105800736A (en) * | 2016-04-27 | 2016-07-27 | 浙江净源膜科技股份有限公司 | High-efficiency treatment method and high-efficiency treatment device for oil-containing wastewater |
| CN107311259A (en) * | 2016-10-19 | 2017-11-03 | 烟台智本知识产权运营管理有限公司 | A kind of binary combination flooding output water degreaser and preparation method thereof |
| CN107879505A (en) * | 2017-11-15 | 2018-04-06 | 苏州纳贝通环境科技有限公司 | A kind of processing method of kitchen waste water |
| CN110342672A (en) * | 2018-04-04 | 2019-10-18 | 中国石油天然气集团有限公司 | Purify the processing system and its processing method of recovered water |
| CN111056649A (en) * | 2018-10-17 | 2020-04-24 | 中国石油化工股份有限公司 | Treatment method of carbon dioxide flooding oilfield produced water |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201458864U (en) * | 2009-06-09 | 2010-05-12 | 北京中联动力技术有限责任公司 | Integrated oil extraction waste water treatment device |
| CN201520704U (en) * | 2009-09-16 | 2010-07-07 | 江苏环发环境工程有限公司 | Low energy-consumption integrated membrane bioreactor |
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2014
- 2014-10-14 CN CN201410537461.2A patent/CN104710034A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201458864U (en) * | 2009-06-09 | 2010-05-12 | 北京中联动力技术有限责任公司 | Integrated oil extraction waste water treatment device |
| CN201520704U (en) * | 2009-09-16 | 2010-07-07 | 江苏环发环境工程有限公司 | Low energy-consumption integrated membrane bioreactor |
Non-Patent Citations (1)
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| 陈观文等: "《膜技术新进展与工程应用》", 31 August 2013, 北京：国防工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105800736A (en) * | 2016-04-27 | 2016-07-27 | 浙江净源膜科技股份有限公司 | High-efficiency treatment method and high-efficiency treatment device for oil-containing wastewater |
| CN107311259A (en) * | 2016-10-19 | 2017-11-03 | 烟台智本知识产权运营管理有限公司 | A kind of binary combination flooding output water degreaser and preparation method thereof |
| CN107879505A (en) * | 2017-11-15 | 2018-04-06 | 苏州纳贝通环境科技有限公司 | A kind of processing method of kitchen waste water |
| CN110342672A (en) * | 2018-04-04 | 2019-10-18 | 中国石油天然气集团有限公司 | Purify the processing system and its processing method of recovered water |
| CN111056649A (en) * | 2018-10-17 | 2020-04-24 | 中国石油化工股份有限公司 | Treatment method of carbon dioxide flooding oilfield produced water |
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