CN103043833A - Electrochemical method for treating polymer-contained sewage of oilfield - Google Patents
Electrochemical method for treating polymer-contained sewage of oilfield Download PDFInfo
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- CN103043833A CN103043833A CN2012105538717A CN201210553871A CN103043833A CN 103043833 A CN103043833 A CN 103043833A CN 2012105538717 A CN2012105538717 A CN 2012105538717A CN 201210553871 A CN201210553871 A CN 201210553871A CN 103043833 A CN103043833 A CN 103043833A
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Abstract
The invention discloses an electrochemical method for treating polymer-contained sewage of an oilfield. The method comprises the following steps: carrying out electric flocculation on oilfield polymer-contained sewage to be treated; carrying out oil and water separation on the electrically flocculated polymer-contained sewage so as to obtain a water phase; and then filtering the water phase to achieve viscosity reduction of the oilfield polymer-contained sewage. According to the invention, the viscosity is moderately reduced; the electric flocculation time can be controlled according to the viscosity of the polymer-contained sewage so as to save power consumption; a flocculation technical unit can be flexibly combined with other sewage treatment units according to water treatment requirements; an electric flocculation technique is mature; the electrochemical method disclosed by the invention has the advantages of simple process, simplicity and convenience in operation, safety and strong adaptability to water quality and water quantity of the polymer-contained sewage, and is easy to control and easy to realize industrial automation application.
Description
Technical field
The present invention relates to a kind of electrochemical method for the polymer-containing sewage in oil field processing, belong to the Applied Electrochemistry technical field.
Background technology
The maximum differential of polymer flooding oil-extraction wastewater and water-drive oil recovery sewage is wherein to contain polymkeric substance, because the existence of polymkeric substance, so that this sewage has some unique character, as: (1) sewage viscosity increases, the water-borne glue body is particle stabilized, the required static balance time of sewage disposal is long, and easily is gathered into agglomerating greasy filth blocking pipe and the equipment of viscosity; (2) polymer-bearing waste-water water-oil interface moisture film intensity is large, elasticity is strong, and interfacial charge is strong, rupture of membranes difficulty, and little oil droplet stably is present in the water body, and the emulsification oil bead diameter is less than the accounting for more than 90% of 10 μ m in the sewage, and median particle size is 3 ~ 5 μ m; (3) polymkeric substance also affects the result of use of water treatment agent water cleaning agent in the sewage, makes the throwing out variation, has greatly increased the consumption of medicament.(4) owing to the strong adsorptivity of polymkeric substance, the quantity of sand and mud that therefore carries is larger, has greatly shortened the Filter Back Washing cycle, increases the back flushing workload.Offshore oilfield is because Production Flow Chart weak point, treatment time, space are all very limited, so these problems are more outstanding.Present offshore oilfield polymer-bearing waste-water poor processing effect, the number of polymers flooding produced liquid causes offshore oilfield part of contaminated water processing unit equipment operating efficiency to reduce, Oil in Sewage Water content after the processing, suspended solids content severe overweight do not reach the return water water quality standard of desired design.Therefore containing polymer sewage from oil extraction is treated as a difficult problem that needs to be resolved hurrily in the tertiary oil production in oil field.There is no at present and utilize electrochemical techniques that polymer-bearing waste-water appropriateness electricity is flocculated viscosity reduction to guarantee the report of the normal operation of follow-up unit equipment and effect.
Summary of the invention
The purpose of this invention is to provide a kind of electrochemical method for the polymer-containing sewage in oil field processing, the method is mainly by logical direct current electricity flocculation in polymer-bearing waste-water, utilize the oxygenizement of anode and the reductive action of negative electrode, make in the sewage degraded of polymkeric substance appropriateness or be removed, reach the purpose of appropriate viscosity reduction, utilize simultaneously anode, negative electrode to separate out H
2Or O
2Micro-bubble and the air supporting effect occurs removes oil in water emulsion in the sewage.Polymer-bearing waste-water appropriateness viscosity reduction, can eliminate that the water-borne glue body that brings because sewage viscosity is too high is particle stabilized, the settling time is long, water-oil interface moisture film intensity is large, clear water degreaser effect is disturbed, carries the series of problems such as quantity of sand and mud is large to the impact of follow-up unit handler normal function, make polymer flooding contain poly-oily(waste)water and expect water quality requirement by satisfying after processing.
A kind of electrochemical method for the polymer-containing sewage in oil field processing provided by the present invention comprises the steps:
Pending polymer-containing sewage in oil field is carried out the electricity flocculation; Polymer-bearing waste-water after the electricity flocculation is obtained water through oily water separation, then described water is filtered the viscosity reduction of namely realizing polymer-containing sewage in oil field.
In the above-mentioned electrochemical method, the anode that described electricity flocculation is adopted can be inert metal, and the negative electrode of employing can be the low-hydrogen over-potential metal.
In the above-mentioned electrochemical method, described inert metal specifically can be the materials such as platinum, ruthenium, rhodium, iridium, titanium or gold;
Described low-hydrogen over-potential metal specifically can be the materials such as zinc, aluminium, iron, copper or stainless steel.
In the above-mentioned electrochemical method, adopt the mode of parallel connection between the electrode that described electricity flocculation is adopted.
In the above-mentioned electrochemical method, the electric current of described electricity flocculation can be 2.0～6.0A, specifically can be 2.0～4.0A, 2.0A, 4.0A or 6.0A, and the time can be 15 ~ 30min, specifically can be 15 ~ 25min, 15min, 20min or 25min.
In the above-mentioned electrochemical method, the spacing between the electrode that described electricity flocculation is adopted can be 4.0～12.0cm, specifically can be 4.0～8.0cm, 4.0cm, 6.0cm or 8.0cm; Ratio between the useful area of described electricity flocculation employing battery lead plate and the pending polymer-bearing waste-water can be 2/19～239cm
2/ mL specifically can be 2/19～2/29cm
2/ mL, 2/19cm
2/ mL, 2/29cm
2/ mL or 2/39cm
2/ mL can select suitable electrode to carry out the electricity flocculation according to the sewage quantity of actual treatment.
In the above-mentioned electrochemical method, described oily water separation implement body can adopt the inclined plate grease device.
In the above-mentioned electrochemical method, described filtration step is undertaken by strainer a and the strainer b that connects successively;
The filler of described strainer a specifically can be walnut shell filtering material, and the filler of described strainer b specifically can be the composite filtering material of walnut shell filtering material and ANTHRACITE FILTER MEDIA.
Compare with existing viscosity reducing process: the chemical oxidization method processing costs is high, oxidation is not thorough; Biochemical process long processing period, efficient are low; Membrane separation process exists film to pollute and blockage problem; Key is the technology and equipment that these methods can't adapt to profit sharp separation in the offshore oil development, and electrochemical method provided by the present invention does not need medicament, therefore consumable anode does not additionally produce mud, non-secondary pollution, saving medicament expense usefulness meets the principle of environmental protection; Owing to be appropriate viscosity reduction, can save power consumption according to the viscosity controller electricity flocculation time of polymer-bearing waste-water, and the flocculation technique unit can be according to the water treatment requirement, with other sewage treatment unit flexible combination; Electric flocculation technique is ripe, and technique is simple, easy and simple to handle, safety, is easy to regulation and control and realizes the industrial automation application, to water quality, the water yield strong adaptability of polymer-bearing waste-water.
Embodiment
Employed experimental technique is ordinary method if no special instructions among the following embodiment.
Used material, reagent etc. if no special instructions, all can obtain from commercial channels among the following embodiment.
Embodiment 1,
Fetch the polymer-bearing waste-water in marine certain oil field, salinity 2780mg/L, contain poly-200mg/L, oil-containing 176.33mg/L, suspended solid 237mg/L, viscosity 1.36mPa.s, this polymer-bearing waste-water inserted carry out electricity flocculation in the electric flocculation plant, the condition of control electricity flocculation is as follows: voltage is 15-22V, and electric current is 4A, adopt altogether 4 cube electrodes, wherein the material of negative electrode employing is aluminium, and the material that anode adopts is ruthenium iridium composition board, adopts array mode in parallel, spacing between the negative electrode and positive electrode is 4.0cm, and the useful area of electrode is 2/19cm with the ratio of pending polymer-bearing waste-water
2/ mL, the time of control electricity flocculation is 20min, and the viscosity of water is 1.06mPa.s after electric flocculation treatment, and viscosity break ratio is 83.3%, and oil-containing is 0mg/L; Then the water after electricity flocculation is passed through water sampling behind the swash plate oil eliminator, suspended solid 62.05mg/L wherein, the particle of particle diameter 3.27～104 μ m accounts for 93%; The strainer of then filling through walnut shell filtering material filters, suspended solid 10.23mg/L in the water that obtains, and the particle of 0.97～55 μ m accounts for 92%; And then the strainer of process walnut shell filtering material and ANTHRACITE FILTER MEDIA filling filters, suspended solid 5.1mg/L in the water that obtains, turbidity 7.8NTU, suspended particle diameter≤2.75 μ m account for 97.45%, reach below the 3 μ m through the sewage particulate diameter after the cascade filtration processing, can make disposes of sewage reaches the control criterion of SY/T5329-2012 comprehensively.
Embodiment 2,
Fetch the polymer-bearing waste-water in marine certain oil field, salinity 8465mg/L, contain poly-172mg/L, oil-containing 216.26mg/L, suspended solid 142mg/L, viscosity 1.32mPa.s), this polymer-bearing waste-water inserted carry out electricity flocculation in the electric flocculation plant, the condition of control electricity flocculation is as follows: voltage is 18-27V, and electric current is 6A, adopt altogether 4 cube electrodes, wherein the material of negative electrode employing is aluminium, and the material that anode adopts is iridium oxide, adopts array mode in parallel, spacing between the negative electrode and positive electrode is 8.0cm, and the useful area of electrode is 2/39cm with the ratio of pending polymer-bearing waste-water
2/ mL, the time of control electricity flocculation is 15min, and the viscosity of water is 1.04mPa.s after electric flocculation treatment, and viscosity break ratio is 87.5%, and oil-containing is 2.1mg/L; Then the water after electricity flocculation is passed through water sampling behind the swash plate oil eliminator, suspended solid 74.26mg/L wherein, the particle of particle diameter 3.27～104 μ m accounts for 90%; The strainer of then filling through walnut shell filtering material filters, suspended solid 12.31mg/L in the water that obtains, and the particle of 0.97～55 μ m accounts for 91%; And then the strainer of process walnut shell filtering material and ANTHRACITE FILTER MEDIA filling filters, suspended solid 6.4mg/L in the water that obtains, turbidity 9.8NTU, suspended particle diameter≤2.75 μ m account for 96.31%, reach below the 3 μ m through the sewage particulate diameter after the cascade filtration processing, can make disposes of sewage reaches the control criterion of SY/T5329-2012 comprehensively.
Embodiment 3,
Fetch the polymer-bearing waste-water in marine certain oil field, salinity 7079mg/L, contain poly-183mg/L, oil-containing 252.81mg/L, suspended solid 197mg/L, viscosity 1.33mPa.s), this polymer-bearing waste-water inserted carry out electricity flocculation in the electric flocculation plant, the condition of control electricity flocculation is as follows: voltage is 10-16V, and electric current is 2A, adopt altogether 4 cube electrodes, wherein the material of negative electrode employing is stainless steel, and the material that anode adopts is titanium, adopts array mode in parallel, spacing between the negative electrode and positive electrode is 6.0cm, and the useful area of electrode is 2/29cm with the ratio of pending polymer-bearing waste-water
2/ mL, the time of control electricity flocculation is 25min, and the viscosity of water is 1.03mPa.s after electric flocculation treatment, and viscosity break ratio is 90.9%, and oil-containing is 0mg/L; Then the water after electricity flocculation is passed through water sampling behind the swash plate oil eliminator, suspended solid 73.64mg/L wherein, the particle of particle diameter 3.27～104 μ m accounts for 91%; The strainer of then filling through walnut shell filtering material filters, suspended solid 9.13mg/L in the water that obtains, and the particle of 0.97～55 μ m accounts for 93%; And then the strainer of process walnut shell filtering material and ANTHRACITE FILTER MEDIA filling filters, suspended solid 5.9mg/L in the water that obtains, turbidity 8.4NTU, suspended particle diameter≤2.75 μ m account for 95.67%, reach below the 3 μ m through the sewage particulate diameter after the cascade filtration processing, can make disposes of sewage reaches the control criterion of SY/T5329-2012 comprehensively.
By the various embodiments described above as can be known, after in the polymer-bearing waste-water processing technological flow, increasing electric flocculation treatment step, after the electricity flocculation, oil droplet in the sewage is conducive to sharp separation because the effect of electricity flocculation generation micro-bubble is easy to assemble, the effect that makes the unit for treating water equipment in the flow process effectively bring into play oil removing, to remove suspended substance, the sewage after the processing can satisfy the requirement of oil field reinjection water matter.Simultaneously electric flocculation treatment technology has safe, energy-conservation, environmental protection, uses easyly, flexible, helps to eliminate the high viscosity of polymkeric substance to the advantages such as disadvantageous effect of other unit for treating water equipment, has application value.
Claims (8)
1. one kind is used for the electrochemical method that polymer-containing sewage in oil field is processed, and comprises the steps:
Pending polymer-containing sewage in oil field is carried out the electricity flocculation; Polymer-bearing waste-water after the electricity flocculation is obtained water through oily water separation; Then described water is filtered the viscosity reduction of namely realizing polymer-containing sewage in oil field.
2. electrochemical method according to claim 1 is characterized in that: the anode that described electricity flocculation is adopted is inert metal, and the negative electrode of employing is the low-hydrogen over-potential metal.
3. electrochemical method according to claim 2 is characterized in that: described inert metal is that platinum, ruthenium, rhodium, iridium, titanium, ruthenium iridium are compound or golden; Described low-hydrogen over-potential metal is zinc, aluminium, iron, copper or stainless steel.
4. each described electrochemical method according to claim 1-3 is characterized in that: the mode that adopts parallel connection between the electrode that described electricity flocculation is adopted.
5. each described electrochemical method according to claim 1-4 is characterized in that: the electric current of described electricity flocculation is 2.0～6.0A, and the time is 15 ~ 30min.
6. each described electrochemical method according to claim 1-5 is characterized in that: the spacing between the electrode that described electricity flocculation is adopted is 4.0～12.0cm; Ratio between the useful area of the electrode that described electricity flocculation is adopted and the pending polymer-bearing waste-water is 2/19～2/39cm
2/ mL.
7. each described electrochemical method according to claim 1-6 is characterized in that: described water-and-oil separator is the inclined plate grease device.
8. each described electrochemical method according to claim 1-7 is characterized in that: described filtration step is undertaken by strainer a and the strainer b that connects successively;
The filler of described strainer a is walnut shell filtering material, and the filler of described strainer b is the composite filtering material of walnut shell filtering material and ANTHRACITE FILTER MEDIA.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539297A (en) * | 2013-11-06 | 2014-01-29 | 中国海洋石油总公司 | Treatment method suitable for fracturing waste fluid from offshore oilfield |
| CN104556497A (en) * | 2014-12-12 | 2015-04-29 | 中国矿业大学(北京) | Method and device for removing organic pollutants in lignite upgrading condensed water |
| CN105293827A (en) * | 2015-11-05 | 2016-02-03 | 前海天乙投资管理（深圳）有限公司 | High emulsified oily wastewater treatment method and high emulsified oily wastewater treatment system |
| CN105461121A (en) * | 2015-11-25 | 2016-04-06 | 克拉玛依市三达新技术股份有限公司 | Electrocoagulation treatment method of wastewater from oil-field work |
| CN106430740A (en) * | 2016-12-08 | 2017-02-22 | 中国石油天然气股份有限公司 | Process suitable for treating flushing waste liquid of polymer flooding injection allocation pipeline in oil field |
| CN111196652A (en) * | 2019-09-19 | 2020-05-26 | 河南中原石油助剂有限公司 | Oil control and mud reduction treatment method and system for oilfield produced water |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539297A (en) * | 2013-11-06 | 2014-01-29 | 中国海洋石油总公司 | Treatment method suitable for fracturing waste fluid from offshore oilfield |
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| CN105461121A (en) * | 2015-11-25 | 2016-04-06 | 克拉玛依市三达新技术股份有限公司 | Electrocoagulation treatment method of wastewater from oil-field work |
| CN106430740A (en) * | 2016-12-08 | 2017-02-22 | 中国石油天然气股份有限公司 | Process suitable for treating flushing waste liquid of polymer flooding injection allocation pipeline in oil field |
| CN111196652A (en) * | 2019-09-19 | 2020-05-26 | 河南中原石油助剂有限公司 | Oil control and mud reduction treatment method and system for oilfield produced water |
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Application publication date: 20130417 |