CN102876356A - Demulsifying dehydration method of oilfield produced liquid - Google Patents
Demulsifying dehydration method of oilfield produced liquid Download PDFInfo
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- CN102876356A CN102876356A CN2011101966877A CN201110196687A CN102876356A CN 102876356 A CN102876356 A CN 102876356A CN 2011101966877 A CN2011101966877 A CN 2011101966877A CN 201110196687 A CN201110196687 A CN 201110196687A CN 102876356 A CN102876356 A CN 102876356A
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Abstract
The invention relates to a demulsifying dehydration method of an oilfield produced liquid. The method comprises a step that emulsifying dehydration is carried out by mixing the oilfield produced liquid with a demulsifying assistant and a demulsifying agent, wherein the oilfield produced liquid contains an emulsified viscosity reducer, the demulsifying assistant comprises one or more of a polymeric aluminum flocculant, a polymeric iron flocculant and a metal-polysilicate flocculant, and the application amount of the demulsifying assistant is 50-10000pm on the basis of the quality of the oilfield produced liquid.
Description
Technical field
The present invention relates to a kind of breaking dehydrating method of oil field mining liquid.
Background technology
The heaviness of crude oil and in poor quality are the trend of world's crude production, and the viscous crude resource is occupied sizable proportion in World's Oil and Gas Resources.According to statistics, viscous crude, super viscous crude account for the world and have verified more than 20% of crude oil reserve, and along with the continuous minimizing that lightweight is easily adopted crude oil, viscous oil recovery causes the attention of various countries day by day.Colloid in the viscous crude, asphalt content are higher, and viscosity is very large, poor fluidity, thereby its exploitation and the defeated difficulty of collection are very large.It is defeated to adopt the production technique of emulsifying pour depressor to substitute to mix rare crude oil to carry out extracting, gathering, has the advantages such as the low and facility investment of energy consumption is few, and China's part oil-field thick-oil block has carried out the chemical viscosity reduction test, and has obtained unusual effect.
Viscous crude refers to 50 ℃ of lower viscosity greater than the crude oil of 50mPa.s, according to 50 ℃ of viscosity can be with the viscous crude Further Division common heavy oil (50～10000mPa.s), special viscous crude (10000～50000mPa.s) and super viscous crude (more than the 50000mPa.s).
The emulsifying pour depressor kind of developing both at home and abroad at present is more, and it mainly is anionic, non--anionic or the composite emulsifying pour depressor of said two devices.Although Emulsifying is one of effective ways of heavy crude producing, but use emulsifying pour depressor can the joint station breaking emulsion and dewatering of back segment be had a negative impact, as bring breakdown of emulsion to divide water time lengthening, emulsion splitter consumption to increase, take off the problems such as rear crude oil water containing exceeds standard, the oil-water emulsion layer thickens with slurry tank drainage belt oil is serious.
Existing document concentrates on the report to the assessment of emulsifying pour depressor viscosity reducing effect and product, to the less discussion of the dehydration problem behind the viscosity reduction mostly.Mainly contain at present two kinds of solution routes: the one, exploitation has the viscosity-depression agent product of good viscosity-reducing performance and easy dehydration property concurrently, a kind of water-base viscosity-reducing agent is disclosed such as patent CN1472276A, has good viscosity reducing effect for viscous crude and super viscous crude, and this viscosity-depression agent has automatic breaking emulsion and dewatering performance, and is good with existing emulsion splitter compatibleness.Another kind of approach is the development of new demulsifier product, but the method weak point is that along with the update of emulsifying pour depressor, emulsion splitter also needs to constantly update.
Summary of the invention
The objective of the invention is provides a kind of breaking dehydrating method easily and effectively for the oil field mining liquid breakdown of emulsion problem of using the reducing viscosity by emulsifying technology to bring, overcomes thick-oil emulsified adhesive-reducing and follow-up breakdown of emulsion and divides contradiction between the water.
A kind of breaking dehydrating method of oil field mining liquid, comprise oil field mining liquid, auxiliary demulsifying agent and emulsion splitter are mixed, carry out breaking emulsion and dewatering, contain emulsifying pour depressor in the described oil field mining liquid, described auxiliary demulsifying agent is one or more in polymeric aluminum based flocculating agent, polymerization iron-based flocculating agent and the polysilics acid metal salt based flocculating agent, take the quality of oil field mining liquid as benchmark, the consumption of auxiliary demulsifying agent is 50-10000ppm.
Described oil field mining liquid both can be the viscous crude Produced Liquid that adopts Emulsifying to exploit out, also can be to adopt viscous crude Produced Liquid that Emulsifying exploits out and the mixed solution of other production practice Produced Liquids.
In the described oil field mining liquid, the content of emulsifying pour depressor is generally 100-10000ppm, and water ratio is generally 5%-95%.
Described emulsifying pour depressor is anionic, non--anionic or the composite emulsifying pour depressor of said two devices, is preferably in phosphate ester salt, sulfuric acid, carboxylate salt and the sulfonate of polyoxyethylene poly-oxygen propylene aether block polyether one or more.The polymerization degree of polyethers is preferably 3～90.The initiator of described polyoxyethylene poly-oxygen propylene aether block polyether is preferably one or more in anhydrous sorbitol carboxylicesters, polyethylene polyamine, alkylphenol and the Fatty Alcohol(C12-C14 and C12-C18).The carbon number of polyethylene polyamine, alkylphenol or Fatty Alcohol(C12-C14 and C12-C18) is preferably 6～20.
Described emulsion splitter is preferably polyether type demulsifying agent, includes but not limited to:
Polyoxypropylene take Fatty Alcohol(C12-C14 and C12-C18) as initiator, polyoxyethylene blocks polyethers are such as SP169;
Quadrol is polyoxypropylene, the polyoxyethylene blocks polyethers of initiator;
Propylene glycol is polyoxypropylene, the polyoxyethylene blocks polyethers of initiator, and BP is serial such as BP169, BP199, BP2040, BE series, Y-270, N-22064 etc.;
Branching type polyoxypropylene take glycerol as initiator, polyoxyethylene blocks polyethers such as GP315;
Branching type polyoxypropylene take polyethylene polyamine as initiator, polyoxyethylene blocks polyethers such as AE series, AE121, AE6952, AE1910, AE8051, AE7921, AE9901, AE10071, AP series, AP221, AP136, AP7041 etc.;
Branching type polyoxypropylene, polyoxyethylene blocks polyethers take phenolic resin, phenol amine resin as initiator, such as F3111, AR36, AR46, TA1031, ST14;
Cross-linking type polyoxypropylene take tolylene diisocyanate as chainextender, polyoxyethylene blocks polyethers, such as BCO1912, POI2420, SD-903, M-501 etc.
Described auxiliary demulsifying agent is preferably one or more in polymeric aluminum, polymerization iron and the polysilics acid metal salt, and above-mentioned substance is the most frequently used inorganic polymer flocculant of water treatment field.Described auxiliary demulsifying agent includes but not limited to: polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, aluminium iron polychloride, PAFS, poly-silicon aluminum chloride, polymeric aluminum sulfate silicate, ferric-polysilicate, zinc polysilicate, polysilicate aluminum ferrite chloride, polysilicate ferric aluminum sulfate, boracic ferric sulfate of polymerized silica.
Take the quality of oil field mining liquid as benchmark, the consumption of auxiliary demulsifying agent is preferably 100-2000ppm.
Among the present invention, the temperature of breaking emulsion and dewatering is generally 30～95 ℃, and the consumption of emulsion splitter is generally 50～300mg/L.
The present invention is applicable to contain the breaking emulsion and dewatering of the oil field mining liquid of emulsifying pour depressor.
The present invention provides a kind of new approaches for the contradiction that solves between thick-oil emulsified adhesive-reducing and the follow-up breaking emulsion and dewatering, namely in conjunction with the constructional feature of emulsifying pour depressor, in oil field mining liquid breakdown of emulsion process, add cheap, nontoxic, efficient inorganic polymer auxiliary demulsifying agent, emulsifying pour depressor remaining in auxiliary demulsifying agent and the Produced Liquid is reacted, destroy the emulsifying effect of viscosity-depression agent, under the synergy of emulsion splitter, finally reach good breaking emulsion and dewatering effect simultaneously.Of the present invention applied widely, broad spectrum is strong, facility investment is few, simple to operate, therefore investment and operation cost are low, are convenient to industrial application.
Embodiment
Further specify the present invention below in conjunction with embodiment.
Test adopts bottle examination method to investigate demulsification, at first with Tahe Heavy Crude (50 ℃ of lower viscosity are 5300mPa.s), Tahe thin oil (50 ℃ of lower viscosity are 28mPa.s) mixes (mass ratio of viscous crude and thin oil is 1: 1) with local water, then add different emulsifying pour depressors, form stable water-oil emulsion after mixing, then add 200ppm emulsion splitter (model: FJY-4B, Xinjiang welfare Fine Chemical Works) and auxiliary demulsifying agent source:, leave standstill dehydration at 70 ℃ of lower constant temperature after mixing, the record different time divides the regimen condition, and compares test with the sample that does not add auxiliary demulsifying agent.Concrete grammar is referring to oil and gas industry standard SY/T5281-2000.
Among the embodiment, four kinds of emulsifying pour depressors that use are respectively T-80 sulfonate sodium (mean polymerisation degree 12, code name α), tetradecanol polyethenoxy ether sodium sulfovinate salt (mean polymerisation degree 20, code name β), isooctylphenol block polyether phosphoric acid ester sodium (mean polymerisation degree 8, code name γ), nonyl phenol block polyether carboxylicesters sodium salt (mean polymerisation degree 10, code name λ).
Embodiment 1
Produced Liquid water ratio 20%, emulsifying pour depressor add-on 200ppm, auxiliary demulsifying agent are liquid polymerization aluminum chloride (product index: alumina content 〉=10.0%, basicity 40.0%-85.0%, water insoluble matter content≤0.5), add-on 150ppm the results are shown in Table 1.
Table 1
Comparative Examples 1
Adopt the identical method of embodiment 1, difference is not add auxiliary demulsifying agent, the results are shown in Table 2.
Table 2
Embodiment 2
Produced Liquid water ratio 20%, emulsifying pour depressor add-on 300ppm, auxiliary demulsifying agent are liquid polymerization ferric sulfate (product index: all iron content 〉=11.0%, basicity 9.0%-14.0%, water insoluble matter content≤0.3), and add-on 200ppm the results are shown in Table 3.
Table 3
Comparative Examples 2
Adopt the identical method of embodiment 2, difference is not add auxiliary demulsifying agent, the results are shown in Table 4.
Table 4
Embodiment 3
Produced Liquid water ratio 30%, emulsifying pour depressor add-on 500ppm, auxiliary demulsifying agent is aluminium iron polychloride (product index: alumina content 〉=27.0%, iron oxide content 3.0%-6.0%, basicity 〉=70.0%, water insoluble matter content≤0.75%), add-on 500ppm the results are shown in Table 5.
Table 5
Comparative Examples 3
Adopt the identical method of embodiment 3, difference is not add auxiliary demulsifying agent, the results are shown in Table 6.
Table 6
Embodiment 4
Produced Liquid water ratio 30%, emulsifying pour depressor add-on 800ppm, auxiliary demulsifying agent is poly-silicon aluminum chloride (product index: alumina content 〉=4.0%, dioxide-containing silica 〉=2.0%, basicity 40.0%-60.0%, water insoluble matter content≤0.6%), add-on 1000ppm the results are shown in Table 7.
Table 7
Comparative Examples 4
Adopt the identical method of embodiment 4, difference is not add auxiliary demulsifying agent, the results are shown in Table 8.
Table 8
Claims (10)
1. the breaking dehydrating method of an oil field mining liquid, comprise oil field mining liquid, auxiliary demulsifying agent and emulsion splitter are mixed, carry out breaking emulsion and dewatering, contain emulsifying pour depressor in the described oil field mining liquid, described auxiliary demulsifying agent is one or more in polymeric aluminum based flocculating agent, polymerization iron-based flocculating agent and the polysilics acid metal salt based flocculating agent, take the quality of oil field mining liquid as benchmark, the consumption of auxiliary demulsifying agent is 50-10000ppm.
2. in accordance with the method for claim 1, it is characterized in that in the described oil field mining liquid, the content of emulsifying pour depressor is 100-10000ppm, water ratio is 5%-95%.
3. in accordance with the method for claim 1, it is characterized in that, described emulsifying pour depressor is one or more in phosphate ester salt, sulfuric acid, carboxylate salt and the sulfonate of polyoxyethylene poly-oxygen propylene aether block polyether, the polymerization degree of polyethers is 3～90, the initiator of described polyoxyethylene poly-oxygen propylene aether block polyether is one or more in anhydrous sorbitol carboxylicesters, polyethylene polyamine, alkylphenol and the Fatty Alcohol(C12-C14 and C12-C18), and the carbon number of polyethylene polyamine, alkylphenol or Fatty Alcohol(C12-C14 and C12-C18) is 6～20.
4. in accordance with the method for claim 1, it is characterized in that described emulsion splitter is polyether type demulsifying agent.
5. in accordance with the method for claim 4, it is characterized in that, described emulsion splitter is selected from one or more in the following block polyether: the polyoxypropylene take Fatty Alcohol(C12-C14 and C12-C18) as initiator, the polyoxyethylene blocks polyethers, quadrol is the polyoxypropylene of initiator, the polyoxyethylene blocks polyethers, propylene glycol is the polyoxypropylene of initiator, the polyoxyethylene blocks polyethers, branching type polyoxypropylene take glycerol as initiator, the polyoxyethylene blocks polyethers, branching type polyoxypropylene take polyethylene polyamine as initiator, the polyoxyethylene blocks polyethers, with phenolic resin, phenol amine resin is the branching type polyoxypropylene of initiator, the polyoxyethylene blocks polyethers, the cross-linking type polyoxypropylene take tolylene diisocyanate as chainextender, the polyoxyethylene blocks polyethers.
6. in accordance with the method for claim 1, it is characterized in that described auxiliary demulsifying agent is one or more in polymeric aluminum, polymerization iron and the polysilics acid metal salt.
7. in accordance with the method for claim 6, it is characterized in that described auxiliary demulsifying agent is selected from one or more in polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, aluminium iron polychloride, PAFS, poly-silicon aluminum chloride, polymeric aluminum sulfate silicate, ferric-polysilicate, zinc polysilicate, polysilicate aluminum ferrite chloride, polysilicate ferric aluminum sulfate and the boracic ferric sulfate of polymerized silica.
8. in accordance with the method for claim 1, it is characterized in that take the quality of oil field mining liquid as benchmark, the consumption of auxiliary demulsifying agent is 100-2000ppm.
9. in accordance with the method for claim 1, it is characterized in that the temperature of breaking emulsion and dewatering is 30～95 ℃.
10. in accordance with the method for claim 1, it is characterized in that the consumption of emulsion splitter is 50～300mg/L.
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| CN103396829A (en) * | 2013-08-14 | 2013-11-20 | 宁波北仑千和环保工程有限公司 | Compound-type demulsifier for ship sump oil and preparation method thereof |
| CN103525987A (en) * | 2013-09-27 | 2014-01-22 | 南京科润工业介质股份有限公司 | Water removal agent and application of water removal agent in new method for removing water by quenching oil |
| CN103771615A (en) * | 2013-03-13 | 2014-05-07 | 中国石油天然气股份有限公司 | Method for disposing various types of oilfield produced water |
| CN103820142A (en) * | 2014-02-28 | 2014-05-28 | 陕西省石油化工研究设计院 | Environment-friendly-type polluted oil processing agent |
| CN104498081A (en) * | 2015-01-09 | 2015-04-08 | 山东德仕石油工程集团股份有限公司 | Natural gas well foam draining extraction emulsion demulsifying agent |
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| CN111592910A (en) * | 2020-06-17 | 2020-08-28 | 金湖金凌新材料科技有限公司 | Compound polyether demulsifier and preparation method thereof |
| CN111592910B (en) * | 2020-06-17 | 2022-02-25 | 金湖金凌新材料科技有限公司 | Method for preparing compound polyether demulsifier |
| CN113041653A (en) * | 2021-03-11 | 2021-06-29 | 浙江杭化科技股份有限公司 | Environment-friendly demulsification water purifier for ethylene device and preparation method thereof |
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