CN105112039A - High temperature resistant oil-soluble viscosity reducer and preparation method thereof - Google Patents
High temperature resistant oil-soluble viscosity reducer and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses a high temperature resistant oil-soluble viscosity reducer and a preparation method thereof, and belongs to the technical field of petroleum exploration. The high temperature resistant oil-soluble viscosity reducer comprises, by weight, 2-4% of an ethylene-vinyl acetate copolymer, 1-3% of fatty amine polyoxypropylene polyoxyethylene ether, and 93-97% of solvent oil. The preparation method comprises: adding an ethylene-vinyl acetate copolymer to solvent oil, stirring for 3-5 h at a temperature of 45-55 DEG C to completely dissolve the ethylene-vinyl acetate copolymer, heating fatty amine polyoxypropylene polyoxyethylene ether to a temperature of 45-55 DEG C, mixing the heated fatty amine polyoxypropylene polyoxyethylene ether and the obtained substance, and continuously stirring for 3-5 h at a temperature of 45-55 DEG C so as to obtain the finished product. According to the present invention, the viscosity reducer resists the high temperature of 350 DEG C, is suitable for heavy oil thermal recovery huff-puff, is not affected by the crude oil nature and the water content, and has good viscosity reducing performance; and with the matching with the steam huff-puff, the viscosity reducer is applied on the heavy oil thermal recovery well, such that the steam injection pressure can be reduced, the steam wave and the volume can be expanded, the crude oil fluidity can be improved, and the oil well oil yield and the gas-oil ratio can be improved.
Description
Technical field
The present invention is specifically related to a kind of high temperature resistant oil-soluble viscosity reducer, and the preparation method of this viscosity-depression agent, belongs to technical field of petroleum extraction.
Background technology
At present, oil-field thick-oil thermal recovery use viscosity-depression agent be water-soluble viscosity-depression agent, when crude oil water containing higher than 30% time, viscosity-depression agent just has good viscosity reducing effect; But when crude oil water containing lower than 30% time, because former Water in oil is less, can not form stable O/W type milk sap, increase former oil viscosity on the contrary, water-soluble viscosity-depression agent can not play a role.Research application oil soluble viscosity reduction technology, can overcome existing emulsifying pour depressor defect, when stratum moisture lower, still effectively can improve crude oil fluidity, improve the percolation ability on stratum.Can oil film be peeled off simultaneously, improve the swept volume of follow-up injecting steam, reduce stratum oil saturation.A production difficult problem for the vapor absorption capacity difference of thorough solution viscous crude initial stage exploitation.
Chinese patent (application number: 200910113418.2) disclose a kind of oil-soluble viscosity reducer, be made up of the component of following parts by weight: 200# solvent oil 15 ~ 25 parts, vinylformic acid mixed ester 15 ~ 20 parts, polymer pour-viscosity reduction agent 45 ~ 55 parts, organic silicon surfactant 10 ~ 15 parts, this viscosity-depression agent can effectively reduce condensation point and viscosity, viscous crude structure is made to become evacuation, but this viscosity-depression agent viscosity break ratio is not high, do not reach 70%, and can not steam injection be accompanied, be not suitable for heavy crude heat extraction.Chinese patent (application number: 201010126843.8) disclose a kind of oil-soluble viscosity breaker composition, with the total mass of composition for benchmark, containing the ester of 50 ~ 90%, the asphaltene dispersants of 5 ~ 45%, all the other are solvent, described ester have in the carboxylicesters of general formula R 1CH (R2) COOCH3 one or more, wherein R1 and R2 is branched-chain alkyl, R1 and R2 can be identical or different, the carbon number sum of R1 and R2 is 10 ~ 50, it is high that this viscosity reduction composition has viscosity break ratio, the features such as safety and stability, but this viscosity reduction composition can not accompany steam injection, cannot in the aboveground application of heavy crude heat extraction.
Summary of the invention
The object of this invention is to provide a kind of high temperature resistant oil-soluble viscosity reducer and preparation method thereof.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of high temperature resistant oil-soluble viscosity reducer, is made up of the component of following weight percentage: ethylene-vinyl acetate copolymer 2 ~ 4%, aliphatic amide polyoxyethylene polyoxypropylene ether 1 ~ 3%, solvent oil 93 ~ 97%.
Described ethylene-vinyl acetate copolymer (EVA) by ethene, vinyl acetate copolymerizedly to form.Its effective content is 5 ~ 10%, is white, elastic film, can be commercial goods.
Described aliphatic amide polyoxyethylene polyoxypropylene ether is clear yellow viscous paste, pH value is 5 ~ 7, water insoluble, be dissolved in ethanol, acetone becomes clear solution, can dissolve in ethanol-water system, being dissolved in white mineral oil and becoming clear solution, can be commercial goods (manufacturer is Jiangsu Hai'an Petrochemical Plant).
Described solvent oil outward appearance is colourless transparent liquid, and by the fractional composition of petroleum of 140 ~ 200 DEG C, being 200# solvent oil, can be commercial goods.
A preparation method for high temperature resistant oil-soluble viscosity reducer, comprises the following steps: joined by ethylene-vinyl acetate copolymer in solvent oil, stirs 3 ~ 5 hours, make it dissolve completely at temperature is 45 ~ 55 DEG C; Aliphatic amide polyoxyethylene polyoxypropylene ether is heated to 45 ~ 55 DEG C, at 45 ~ 55 DEG C, continues stirring 3 ~ 5 hours again after mixing with above-mentioned substance, to obtain final product.
Beneficial effect of the present invention:
The component of the present invention is high temperature resistant oil-soluble viscosity reducer is simple, and between component, synergy significantly: ethylene-vinyl acetate copolymer and solvent have separately viscosity reduction effect, and single dose viscosity break ratio reaches about 60%, and aliphatic amide polyoxyethylene polyoxypropylene ether has pour-point depressing process; After three kinds of composition synthesis, viscosity break ratio reaches more than 80%, reduces zero pour 2-3 DEG C simultaneously.
Viscosity-depression agent of the present invention has the following advantages:
(1) high temperature resistant 350 DEG C, applicable heavy crude heat extraction is handled up.Coordinating with steam rapid heat cycle is handled up, and in the aboveground application of heavy crude heat extraction, can reduce steam injection pressure, expands steam swept volume, improves crude oil fluidity.Thus extend the production time in cycle, improve oil well produce oil and gas oil ratio.
(2) for the crude oil of different crude oils character (common heavy oil, super―heavy oil etc.), different water cut (0 ~ 70%), all have Viscosity-reducing preferably.When adding concentration and being 4% of pure oil, viscosity break ratio reaches more than 80%; Be increased to 8% along with adding concentration, viscosity break ratio reaches more than 90%.Add-on is few, economical and practical, cheap.
(3) do not contain organochlorine through inspection, to downstream refinery technique without harm, namely the follow-up dehydrating of crude oil of system and water conditioning are not all had an impact.
Oil-soluble viscosity reducer of the present invention, can heatproof 350 DEG C, is applicable to companion steam injection stratum.Moisture low water 30% and to different crude oils character, all there is good viscosity reducing effect, viscosity break ratio all reaches more than 80%.
The method that the present invention prepares oil-soluble viscosity reducer is simple, easy to operate, and stirring and evenly mixing under 45 ~ 55 DEG C of conditions is suitable for suitability for industrialized production and rig-site utilization.
Embodiment
Following embodiment is only described in further detail the present invention, but does not form any limitation of the invention.
Embodiment 1
In the present embodiment, high temperature resistant oil-soluble viscosity reducer is made up of the component of following weight percentage: ethylene-vinyl acetate copolymer (EVA) 2%, aliphatic amide polyoxyethylene polyoxypropylene ether 3%, 200# solvent oil 95%.Preparation method is: the EVA taking 20 kilograms puts into reactor, adds the solvent oil of 950 kilograms, stirs 4 hours, make it all dissolve under temperature 50 C condition; Again the aliphatic amide polyoxyethylene polyoxypropylene ether of 30 kilograms is heated to 50 DEG C, can flows, then pour in reactor, under 50 DEG C of conditions, continue stirring 4 hours, obtain the viscosity-depression agent of 1000 kilograms.
Embodiment 2
In the present embodiment, high temperature resistant oil-soluble viscosity reducer is made up of the component of following weight percentage: ethylene-vinyl acetate copolymer (EVA) 2%, aliphatic amide polyoxyethylene polyoxypropylene ether 1%, 200# solvent oil 97%.Preparation method is: the EVA taking 20 kilograms puts into reactor, adds the solvent oil of 970 kilograms, stirs 5 hours, make it all dissolve under temperature 45 C condition; Again the aliphatic amide polyoxyethylene polyoxypropylene ether of 10 kilograms is heated to 45 DEG C, can flows, then pour in reactor, under 45 DEG C of conditions, continue stirring 5 hours, obtain the viscosity-depression agent of 1000 kilograms.
Embodiment 3
In the present embodiment, high temperature resistant oil-soluble viscosity reducer is made up of the component of following weight percentage: ethylene-vinyl acetate copolymer (EVA) 4%, aliphatic amide polyoxyethylene polyoxypropylene ether 3%, 200# solvent oil 93%.Preparation method is: the EVA taking 40 kilograms puts into reactor, adds the solvent oil of 930 kilograms, stirs 3 hours, make it all dissolve under temperature 55 DEG C of conditions; Again the aliphatic amide polyoxyethylene polyoxypropylene ether of 30 kilograms is heated to 55 DEG C, can flows, then pour in reactor, under 55 DEG C of conditions, continue stirring 3 hours, obtain the viscosity-depression agent of 1000 kilograms.
The commercial goods that aliphatic amide polyoxyethylene polyoxypropylene ether used in above-described embodiment provides for Jiangsu Hai'an Petrochemical Plant.
Test example 1
This experimental example chooses the crude oil of different thermal recovery well, adds embodiment 1 gained viscosity-depression agent (add-on is 5% of crude quality), measures its viscosity reducing effect.Result is as shown in table 1.
Table 1 embodiment 1 gained viscosity-depression agent viscosity reducing effect
| Pound sign | GB125 | G4705 | L7-1H | YQ3-P11 | YQ3-P14 |
| Crude oil original viscosity (mpas) | 1199 | 3300 | 27260 | 159693 | 221551 |
| Add the viscosity after 5% viscosity-depression agent | 221 | 417 | 3564 | 21079 | 22545 |
| Viscosity break ratio | 81.6％ | 87.4％ | 86.9％ | 86.8％ | 89.8％ |
As can be seen from Table 1, after adding the molten viscosity-depression agent of 5% embodiment 1 gained oil, viscosity of crude reduces rapidly, and viscosity break ratio is more than 80%.By 5 mouthfuls of well data in contrast form, YQ3-P14 viscosity of crude is the highest, and viscosity of crude reaches 221551mPa.s, and this well viscosity break ratio is also the highest, is 89.8%; GB125 viscosity of crude is low, only has 1199mPa.s, and this well viscosity break ratio is 81.6%.Experimental result shows, oil-soluble viscosity reducer of the present invention is better to viscosity reducing effect that is special, super-viscous oil.
Test example 2
This experimental example is aboveground on probation Henan Oil Field king 943 by embodiment 1 gained viscosity-depression agent.This well due to viscosity of crude high and with short production cycle, and polished rod is delayed in process of production.In the process of steam treatment, inject (viscosity-depression agent add-on is 5% of crude quality) after the measure of 10 tons of embodiment 1 gained viscosity-depression agents, the production cycle extends, day produce oil increase by 1.5 tons, production effect be improved significantly.Following table 2 is viscosity of crude tracking result of laboratory test.
Table 2 Henan Oil Field Wang943Jing adds viscosity of crude tracking results after viscosity-depression agent
| King 943 well head | 30℃ | 40℃ | 50℃ | 60℃ | 70℃ |
| Viscosity of crude (mpas) before measure | 57745 | 25095 | 13232 | 7950 | 2540 |
| Viscosity (mpas) after dosing in measure cup | 12873 | 4916 | 2345 | 877 | 354 |
| Viscosity of crude (mpas) after measure | 8751 | 4957 | 2798 | 1821 | 987 |
As can be seen from Table 2, viscosity-depression agent of the present invention obviously improves the crude oil fluidity of thick oil thermal extraction, has significant viscosity reducing effect.
Claims (4)
1. a high temperature resistant oil-soluble viscosity reducer, is characterized in that: be made up of the component of following weight percentage: ethylene-vinyl acetate copolymer 2 ~ 4%, aliphatic amide polyoxyethylene polyoxypropylene ether 1 ~ 3%, solvent oil 93 ~ 97%.
2. high temperature resistant oil-soluble viscosity reducer according to claim 1, is characterized in that: described ethylene-vinyl acetate copolymer by ethene, vinyl acetate copolymerizedly to form.
3. high temperature resistant oil-soluble viscosity reducer according to claim 1, is characterized in that: described solvent oil, by the fractional composition of petroleum of 140 ~ 200 DEG C, is 200# solvent oil.
4. the preparation method of a high temperature resistant oil-soluble viscosity reducer as claimed in claim 1, it is characterized in that: comprise the following steps: ethylene-vinyl acetate copolymer is joined in solvent oil, stir 3 ~ 5 hours at temperature is 45 ~ 55 DEG C, make it dissolve completely; Aliphatic amide polyoxyethylene polyoxypropylene ether is heated to 45 ~ 55 DEG C, at 45 ~ 55 DEG C, continues stirring 3 ~ 5 hours again after mixing with above-mentioned substance, to obtain final product.
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Cited By (5)
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| CN105950127A (en) * | 2016-05-16 | 2016-09-21 | 中国石油化工股份有限公司 | Pour point depressing and viscosity reducing composition for heavy oil, pour point depressing and viscosity reducing agent for heavy oil and preparation method of pour point depressing and viscosity reducing agent |
| CN106047329A (en) * | 2016-06-06 | 2016-10-26 | 中国石油化工股份有限公司 | High-temperature-resistant pour-point depressant and preparation method thereof |
| CN107663448A (en) * | 2016-07-27 | 2018-02-06 | 中国石油天然气股份有限公司 | A kind of oil soluble viscosity reducer for oil transfer and preparation method thereof |
| CN109295739A (en) * | 2018-09-19 | 2019-02-01 | 蓝天佑 | A kind of environment-friendly type polyglycol ether processing thinner and preparation method thereof |
| CN112457837A (en) * | 2020-11-24 | 2021-03-09 | 中国石油大学(华东) | Solid asphaltene inhibitor and preparation method and application thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105950127A (en) * | 2016-05-16 | 2016-09-21 | 中国石油化工股份有限公司 | Pour point depressing and viscosity reducing composition for heavy oil, pour point depressing and viscosity reducing agent for heavy oil and preparation method of pour point depressing and viscosity reducing agent |
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| CN106047329B (en) * | 2016-06-06 | 2020-03-06 | 中国石油化工股份有限公司 | High-temperature-resistant pour point depressant and preparation method thereof |
| CN107663448A (en) * | 2016-07-27 | 2018-02-06 | 中国石油天然气股份有限公司 | A kind of oil soluble viscosity reducer for oil transfer and preparation method thereof |
| CN109295739A (en) * | 2018-09-19 | 2019-02-01 | 蓝天佑 | A kind of environment-friendly type polyglycol ether processing thinner and preparation method thereof |
| CN112457837A (en) * | 2020-11-24 | 2021-03-09 | 中国石油大学(华东) | Solid asphaltene inhibitor and preparation method and application thereof |
| CN112457837B (en) * | 2020-11-24 | 2023-01-24 | 中国石油大学(华东) | Solid asphaltene inhibitor and preparation method and application thereof |
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