CN102718287A - Low-energy-consumption precise-treatment process for oily sewage of oil field - Google Patents
Low-energy-consumption precise-treatment process for oily sewage of oil field Download PDFInfo
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- CN102718287A CN102718287A CN2012102461554A CN201210246155A CN102718287A CN 102718287 A CN102718287 A CN 102718287A CN 2012102461554 A CN2012102461554 A CN 2012102461554A CN 201210246155 A CN201210246155 A CN 201210246155A CN 102718287 A CN102718287 A CN 102718287A
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Abstract
The invention provides a low-energy-consumption precise-treatment process for oily sewage of an oil field, relates to the technical field of oil fields, and particularly relates to the field of a water reinjection treating technology of a low-permeability oil field. A tubular immersing type ultra-filtration membrane with one sealed end is immersed under the liquid level of oily sewage to be treated; an opening end of the tubular immersing type ultra-filtration membrane is connected with a water suction pump; and outside the tubular immersing type ultra-filtration membrane, a polluted layer of the tubular immersing type ultra-filtration membrane is blown off by air. The low-energy-consumption precise treatment process disclosed by the invention effectively improves the output rate of membrane output water and relieves the pollution degree of the ultra-filtration membrane, the membrane flux is stable and the operation stability of a system is good; and compared with a cross flow filtration process, according to the method, the energy consumption is reduced by more than 50% and the energy consumption can be reduced to be 0.3-0.5 RMB/m<3>. After the treatment, the water quality meets requirements of the A-grade water quality of low-permeability oil deposit water injection; and meanwhile, a reasonable membrane filtering and washing process is applied to effectively relieving the pollution degree of the ultra-filtration membrane and keeping the flux of the ultra-filtration membrane stable for a long period.
Description
Technical field
The present invention relates to the oilfield technology field, particularly low permeability oil field re-injection water-treatment technology field.
Background technology
Low permeability oil field has that the reservoir hole is little, venturi is thin, and seepage resistance is big, and therefore characteristics such as transmissibility difference have higher requirement to injecting water.The oil and gas industry standard SY/T 5329-94 of the People's Republic of China " petroclastic rock reservoir water water quality is recommended index and analytical procedure " has stipulated that low permeability oil field injects water suspended substance solids content＜1～3mg/l, suspended particle median particle size＜1～3 * 10
-3Mm, oleaginousness＜5～8mg/l; In order to reach above-mentioned requirements; The oil field mainly adopts gravity oil-removing, coagulation, coarse filtration and smart filtering technology to combine at present; Pressure oil removing (eddy flow, coarse), coagulation, coarse filtration and smart filtering technology combine; The three cover methods that air supporting choosing, coarse filtration and smart filtering technology combine are controlled oil-contg, suspended substance solids content, the suspended particle median particle size of oily(waste)water, but above technology all has process procedure many, can not effectively remove oil in water emulsion and organism, can not stably be controlled at the defective in the water injection in low-permeability oilfield water quality standard scope to oil-contg, suspended substance solids content, suspended particle median particle size.
In recent years, along with the progress of domestic water treatment technology, materialization oil removing and fibre-ball filtration combine, materialization oil removing and fibre bundle filtration combines, biological activity mud and ultra-filtration membrane process combined begin to use in the oil-field water treatment system gradually.Common physicochemical techniques can not effectively be removed oil in water emulsion and organism, fibrous nodules, fibrous bundle by oil and Organic pollutants after, the regeneration difficulty is big, work-ing life is short.
In biological activity mud and ultra-filtration membrane process combined; There is following several respects problem: though 1. utilize biological activity mud that the free oil in the oily(waste)water, oil in water emulsion and other organism have been carried out effective removal; Alleviated the pollution of oil to ultra-filtration membrane; But zoogloea can't be fixed in the biological activity mud, mainly leans on ultra-filtration membrane that mikrobe and extracellular polymeric are held back, and therefore a large amount of extracellular polymerics has carried out severe contamination to ultra-filtration membrane; Ultra-filtration membrane regeneration difficulty, ultrafiltration system can't steady in a long-term move; 2. the ultra-filtration membrane matting is frequent, and the field management difficulty is big; 3. for alleviating the Pollution of Ultrafiltration Membrane degree; Adopt tubular ultra-filtration membrane cross flow filter mode; Principle: the end of former water by tubular ultra-filtration membrane fed, collect liquid concentrator at the other end and be used for refluxing, obtain film water production rate (being filterable water) at the outside surface of tubular ultra-filtration membrane.Oily(waste)water is after the tubular ultra-filtration membrane cross flow filter is handled, and the outlet water conditioning can satisfy the water injection in low-permeability oilfield water quality requirement.For alleviating of the pollution of film pollution layer to ultra-filtration membrane; The main method that improves crossflow velocity that adopts reduces face film pollution layer thickness; General film water production rate has only about 10～20% of film flooding velocity, and concentrated solution discharge is about 80～90% of a film flooding quantity, and crossflow velocity is controlled between 2～3m/s; Therefore the cross flow filter energy consumption is higher, generally filters energy consumption at 1.5～1.8 yuan/m
3About.The existence of above problem has restricted high precision ultra-filtration membrane applying in disposing polluted water in oil.
Summary of the invention
The present invention seeks to propose a kind of oil-contaminated water of oil field less energy-consumption fine processing technology; When handling oil-contaminated water of oil field to solve conventional materialization processing+ultra-filtration membrane method, the ultra-filtration membrane problems such as fast, ultra-filtration membrane regeneration difficulty, system's operation stability are poor, energy consumption height that are prone to descended by crude oil and Organic pollutants, ultra-filtration membrane flux.
Technical scheme of the present invention is: the tubulose submerged ultrafiltration of end sealing is immersed under the pending oily(waste)water liquid level; Opening end at the tubulose submerged ultrafiltration connects water suction pump, and outside the tubulose submerged ultrafiltration, adopts the pollution layer of gas stripping tubulose submerged ultrafiltration.
Principle of work of the present invention is: water molecules gets into tubulose submerged ultrafiltration inner chamber through the tube wall of tubulose submerged ultrafiltration in the pending oily(waste)water; Under the effect of producing water pump, collect the back and form film product water, reach A level injection water quality standard by tubulose submerged ultrafiltration inner chamber.
Because the present invention has adopted the air blow off stripping to be attached to the outer pollution layer of tubulose submerged ultrafiltration; Can effectively improve the output capacity that film produces water; Alleviate the pollution level of ultra-filtration membrane, membrane flux is stable, system's good operation stability, compares with cross flow filter technology; Energy consumption reduces more than 50%, and energy consumption can be reduced to 0.3～0.5 yuan/m
3Handle back water quality and satisfy low-permeability oil deposit water filling A level water quality requirement,, can effectively alleviate the pollution level of ultra-filtration membrane, make ultra-filtration membrane flux stable for extended periods of time simultaneously through rational membrane filtration of utilization and cleaning.
The present invention preferably also need control the oleaginousness≤3mg/L in the pending oily(waste)water, to alleviate the pollution of sump oil to the tubulose submerged ultrafiltration, reduces the backwash rate of tubulose submerged ultrafiltration.
In order to improve the stripping effect, alleviate film pollution layer thickness, the volume ratio of gas according to the invention and pending oily(waste)water is preferably 30 ︰ 1.
Further: the present invention is vertically placed on the opening end of tubulose submerged ultrafiltration in the pending water up, makes the opening end of tubulose submerged ultrafiltration be lower than liquid level 1～2m on the processing oily(waste)water.
Form tubulose submerged ultrafiltration and atmosphere formation pressure difference with this, be more conducive to adopt the water suction pump of low lift.
Better scheme is: the opening end of tubulose submerged ultrafiltration is lower than handles liquid level 1.5m on the oily(waste)water.
Embodiment
One, prepare:
A plurality of production wells are installed at the bottom of treating pond, the inlet end of each production well is linked to each other with aerating apparatus through pipeline.
The tubulose submerged ultrafiltration of one end sealing is installed in the treating pond vertically, opening end up, closedend makes each production well be arranged in the ultra-filtration membrane below down, connects water suction pump at the opening end of tubulose submerged ultrafiltration.
Two, treatment process:
The pending oily(waste)water of oleaginousness≤3mg/L is after treatment placed treating pond, keep the opening end of tubulose submerged ultrafiltration to be lower than and handle liquid level 1～2m on the oily(waste)water, better scheme is 1.5m.
Through the control aerating apparatus, the volume ratio that makes gas and pending oily(waste)water is 30 ︰ 1.
In order stably to handle, the oleaginousness control method in the treating pond can be: squeeze into condensed water in the film product pond in the treating pond with certain proportion, thereby dense water quality oleaginousness maintains in the 3mg/L in the maintenance treating pond.
Three, treatment effect:
The ultra-filtration membrane last effect: the ultra-filtration membrane flux stabilized, the in-situ chemical cleaning interval reaches half a year above (in membrane cisterna, carrying out matting).
After the ultrafiltration membrane treatment, the effluent quality index reaches low permeability oil field A level injection water quality index:
Suspended substance solids content≤1～3mg/L, median particle size≤1～2 μ m, oleaginousness≤1mg/L.
The filtration power consumption is effectively controlled, generally at 0.3～0.5 yuan/m
3
Claims (5)
1. oil-contaminated water of oil field less energy-consumption fine processing technology; It is characterized in that the tubulose submerged ultrafiltration of end sealing is immersed under the pending oily(waste)water liquid level; Opening end at the tubulose submerged ultrafiltration connects water suction pump, and outside the tubulose submerged ultrafiltration, adopts the pollution layer of gas stripping tubulose submerged ultrafiltration.
2. according to the said oil-contaminated water of oil field less energy-consumption of claim 1 fine processing technology, it is characterized in that the oleaginousness≤3mg/L in the pending oily(waste)water.
3. according to the said oil-contaminated water of oil field less energy-consumption of claim 1 fine processing technology, the volume ratio that it is characterized in that said gas and pending oily(waste)water is 30 ︰ 1.
4. according to claim 1 or 2 or 3 said oil-contaminated water of oil field less energy-consumption fine processing technologies; It is characterized in that the opening end of tubulose submerged ultrafiltration is vertically placed in the pending water up, make the opening end of tubulose submerged ultrafiltration be lower than liquid level 1～2m on the processing oily(waste)water.
5. according to the said oil-contaminated water of oil field less energy-consumption of claim 4 fine processing technology, it is characterized in that the opening end of said tubulose submerged ultrafiltration is lower than liquid level 1.5m on the processing oily(waste)water.
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| CN2012102461554A CN102718287A (en) | 2012-07-17 | 2012-07-17 | Low-energy-consumption precise-treatment process for oily sewage of oil field |
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| CN2012102461554A CN102718287A (en) | 2012-07-17 | 2012-07-17 | Low-energy-consumption precise-treatment process for oily sewage of oil field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402132A (en) * | 2014-09-28 | 2015-03-11 | 中石化石油工程设计有限公司 | Equipment and method for fine filtering of ultra-low permeability oil field A1-grade reinjection water |
| CN104837776A (en) * | 2012-11-13 | 2015-08-12 | 艾威拉股份公司 | Purification of oil-polluted water and device suitable therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101028949A (en) * | 2006-02-27 | 2007-09-05 | 中国科学院生态环境研究中心 | Cast-sand membrane biological reactor |
| CN101219846A (en) * | 2008-01-23 | 2008-07-16 | 哈尔滨工业大学 | Ultrafiltration membrane coagulation /adsorption/bioreactor integrating advanced water treatment method and device |
| CN101318738A (en) * | 2008-07-15 | 2008-12-10 | 郑州蓝德环保科技有限公司 | Membrane filtration separation method for wastewater treatment and equipment thereof |
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2012
- 2012-07-17 CN CN2012102461554A patent/CN102718287A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101028949A (en) * | 2006-02-27 | 2007-09-05 | 中国科学院生态环境研究中心 | Cast-sand membrane biological reactor |
| CN101219846A (en) * | 2008-01-23 | 2008-07-16 | 哈尔滨工业大学 | Ultrafiltration membrane coagulation /adsorption/bioreactor integrating advanced water treatment method and device |
| CN101318738A (en) * | 2008-07-15 | 2008-12-10 | 郑州蓝德环保科技有限公司 | Membrane filtration separation method for wastewater treatment and equipment thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104837776A (en) * | 2012-11-13 | 2015-08-12 | 艾威拉股份公司 | Purification of oil-polluted water and device suitable therefor |
| US10358360B2 (en) | 2012-11-13 | 2019-07-23 | Eviola S.A. | Purification of oil-polluted water and device suitable therefor |
| CN104402132A (en) * | 2014-09-28 | 2015-03-11 | 中石化石油工程设计有限公司 | Equipment and method for fine filtering of ultra-low permeability oil field A1-grade reinjection water |
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