CN107828401A - One kind enhancing CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil - Google Patents
One kind enhancing CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil Download PDFInfo
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- CN107828401A CN107828401A CN201710430205.7A CN201710430205A CN107828401A CN 107828401 A CN107828401 A CN 107828401A CN 201710430205 A CN201710430205 A CN 201710430205A CN 107828401 A CN107828401 A CN 107828401A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/82—Oil-based compositions
Abstract
The invention discloses one kind to strengthen CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, is made up of solubilizer and oil-soluble viscosity reducer, and the weight ratio of solubilizer and oil-soluble viscosity reducer is 2~8:1；Wherein, the solubilizer is p-methylbenzoic acid ester type compound；The oil-soluble viscosity reducer is acrylate long-chain ester vinylacetate acrylamide copolymer.The oil driving additive of the present invention, can be with CO2Fluid dissolves each other, by changing CO2Thermodynamic fluid property, strengthen CO2The ability of crude oil is dissolved in, promotion forms miscible-phase displacement.In addition, the oil displacement agent of the present invention can also be by CO2Be carried to crude oil contact site, be dissolved in crude oil, destroy the micellar structure that crude oil studies on asphaltene colloid lamination stack product forms, play a part of viscosity reduction, strengthen crude oil fluidity, be particularly suitable for use in high viscous, hypotonic heavy crude reservoir, has broad application prospects.
Description
Technical field
The present invention relates to one kind to strengthen CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, in CO2Reinforcing is driven to adopt
Oil (CO2- EOR) during, CO can be strengthened simultaneously2Dissolved each other with crude oil and reduce viscosity of crude, so as to improve oil recovery factor, category
In oil field development technical field.
Background technology
The exploitation of oil generally can be divided into three phases, and primary oil recovery is to utilize stratum natural energy driving crude oil, harvesting
Rate is typically 5%~20%；Secondary oil recovery can be adopted using the mode water filling or gas injection for maintaining stratum energy, secondary oil recovery
Go out the 30%~40% of crude oil reserve, but the crude oil for still having 60%~70% remains in underground, therefore the new skill of tertiary oil recovery
The research and application of art have great economic value and learning value.Tertiary oil recovery, refer to by injecting other fluids, adopting
With reservoir rockses and fluid properties are changed the methods of physics, chemistry, heat, biology, the recovery ratio of water-drive pool is improved.Three times
The method of oil recovery is a lot, can be divided mainly into four major classes：First, heating power drives, including steam drive, steam soak, combustion in situ etc.；Two
It is that gas mixed phase drives (or non-phase-mixing driving) technology, including CO2Mixed phase, hydrocarbon mixed phase and other inert gas mixed phases drive；Third, chemistry
Drive, including polymer flooding, surfactant flooding, caustic waterflooding and note concentrated sulfuric acid drive etc.；Fourth, microbe oil production, including biology are poly-
Compound, antimicrobial surface activity are driven.At present, mainly based on chemical flooding, objective for implementation is mainly reservoir condition phase for tertiary oil recovery
To preferable oil field, but various displacement of reservoir oil methods have respective advantage and disadvantage, it is difficult to fully meet the displacement of reservoir oil of oil reservoir under varying environment.
In recent years, with China's oil Exploitation degree gradually deeply, the difficulty of the high and low infiltration of viscosity adopt the exploitation of heavy crude reservoir increasingly by
To attention.Viscous crude resource accounts for more than the 20% of China's oil total resources, and wherein most belongs to difficulty and adopts viscous crude, development degree again
Low, difficulty is big, and existing technology of reservoir sweep can not be applicable it completely.Therefore, strengthen the research to tertiary oil recovery technology, improve
Its applicability to different oil reservoirs has great importance.
Note CO2Gas drive is important tertiary oil recovery technology, due to CO2Gas drive positive effect, and during make use of CO2Can
To mitigate greenhouse effects, therefore it is just causing the very big concern of international community.According to CO2With the difference of crude oil mixed phase degree, CO2
The mechanism of gas drive can be divided into mixed phase drive and non-phase-mixing driving.Wherein, non-phase-mixing driving refers to CO2Crude oil is dissolved in, makes crude oil swollen
It is swollen, crude oil surface tension and viscosity are reduced, forms dissolved gas drive.It is postcritical and mixed phase drives and then referred under elevated pressure conditions
CO2It can reach and once contact or multicontact miscibility with crude oil, now CO2Can be extracted light components in crude oil, dissolve crude oil
Pitch, paraffin ability decline, and heavy ingredient separates out, and viscosity of crude is greatly reduced.In addition, CO when mixed phase drives2Have in formation oil
There is higher solvability, help to expand formation oil, give full play to the elastic expansion energy of formation oil, promote fluid to flow into
Shaft bottom.Due to the difference of the mechanism of action, the displacement efficiency that mixed phase drives will be significantly better than non-phase-mixing driving.CO2Gas drive process belongs to mixed
Mutually or non-mixed phase depends primarily on strata pressure and CO2The relative size of minimum miscibility pressure (MMP) (MMP) between-crude oil, if stratum
Pressure is higher than MMP, then can form mixed phase drive.However, for most of oil reservoirs, especially viscosity is high, the viscous crude more than heavy component
Oil reservoir, its MMP is general very high, does not often reach the condition to form mixed phase drive, CO2Displacement efficiency will decline.Therefore, still need to
Further study to improve CO2Drive the applicability to different crude oils.
The content of the invention
For above-mentioned prior art, the invention provides one kind to strengthen CO2Dissolve each other, reduce with crude oil the displacement of reservoir oil of viscosity of crude
Additive, in CO2Drive intensified oil reduction (CO2- EOR) during, CO can be strengthened simultaneously2Dissolved each other with crude oil and reduce viscosity of crude,
So as to improve oil recovery factor.
The present invention is achieved by the following technical solutions：
One kind enhancing CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, by solubilizer and oil-soluble viscosity reducer
The weight ratio of composition, solubilizer and oil-soluble viscosity reducer is 2~8:1；Wherein, the solubilizer is that can dissolve crude oil polarity group
Divide, the p-methylbenzoic acid ester type compound of long-chain component (can be commercially available, or conventional method is prepared into by conventional market
To), its can under certain condition with CO2It is miscible, promote CO2It is dissolved in crude oil；Its relative molecular mass 180.07~
320.22, structural formula is as follows, and in structural formula, n is 2~12 integer；
The oil-soluble viscosity reducer is acrylate long-chain ester-vinyl acetate-acrylamide copolymer, and it contains polar group
Roll into a ball and there is larger spatial extent degree, can effectively break crude oil studies on asphaltene and colloid planes of molecules stacked structure, reduce former
Oil viscosity；Its structural formula is as follows：
In formula ,-R represents saturated alkyl chain, and its C atomicity is 12~18；i:j:K=(2~6):(1~5):(2~8).
Acrylate long-chain ester-the vinyl acetate-acrylamide copolymer, is prepared by the following method to obtain：
Using alkyl acrylate (C atomicities is 12~18 in alkyl), vinylacetate and acrylamide for raw material, three's mol ratio
For (2~6):(1~5):(2~8), using toluene as solvent, adding initiator azodiisobutyronitrile, (dosage is raw material gross weight
5%), under nitrogen atmosphere, 8~12h of reaction is stirred at reflux under the conditions of 65~75 DEG C, obtains terpolymer；Naturally cool to
Room temperature, adding methanol precipitates copolymer, filters, and is dried in vacuo at 50 DEG C ± 3 DEG C, produces acrylate long-chain ester-vinyl acetate
Ester-acrylamide copolymer.
The enhancing CO of the present invention2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, during concrete application, can pass through
With note or preposition mode and CO2Stratum is mixed into, promotes CO2Mixed phase is formed between-crude oil, reduces viscosity of crude, strengthens crude oil
Mobility, improve oil recovery factor.When being injected in a manner of with note, its total usage amount is the CO that the displacement of reservoir oil uses2The 3% of total amount
~8%；When being injected in a manner of preposed attributives, its total usage amount is CO in preposed attributives layer2The 5%~30% of total amount.
The research and development basis of the present invention and thinking are：Now there are some researches show in CO2With in crude oil contact process, CO2Leading edge with
Crude oil+CO caused by the joint portion of crude oil2Mixing portion, viscosity decline notable, have extremely strong extracting and molten for crude oil
Xie Xing, the influence of the appearance of this mixing portion to crude oil fluidity and Flooding Efficiency are very big.For enhancing CO2Fluid is to crude oil
The consideration of miscibility, chemical agent such as is used as CO2Displacement accelerator, crude oil+CO can be promoted by means of the chemical agent of addition2
Contact portion mixed phase develops, and significantly improves viscosity of crude and mobility, reaches the purpose for improving recovery ratio.If in addition, change
Learn agent has reducing crude oil viscosity effect simultaneously, then it can be by CO2Be carried to crude oil contact portion, be dissolved in crude oil, utilize chemistry
Agent own structural characteristics, the overlapping packed structures of plane between asphalitine supermolecule and colloid molecule are destroyed, it is empty to reduce pitch micella
Between extensibility, make the distribution of pitch micella more scattered, so as to reduce viscosity of thickened oil, strengthen crude oil fluidity, improve oil recovering
Rate.Therefore, the present invention utilizes chemical agent+CO2Double dominant, reduce viscosity of crude and enhancing crude oil fluidity, by two kinds
Exploitation technology is organically combined, and have developed enhancing CO2Dissolve each other, reduce with crude oil viscosity of crude the displacement of reservoir oil addition
Agent.
The oil driving additive of the present invention, can be with CO2Fluid dissolves each other, by changing CO2Thermodynamic fluid property, strengthen CO2
The ability of crude oil is dissolved in, promotion forms miscible-phase displacement.In addition, the oil displacement agent of the present invention can also be by CO2It is carried to and is connect with crude oil
Contact portion, crude oil is dissolved in, destroys the micellar structure that crude oil studies on asphaltene-colloid lamination stack product forms, play a part of viscosity reduction,
Strengthen crude oil fluidity.The oil driving additive of the present invention is to CO2- crude oil solubilising is strong, while crude oil can be greatly reduced and glue
Degree, and injection is good, stratum is applied widely, and be particularly suitable for use in high viscous, hypotonic heavy crude reservoir, before having wide application
Scape.
Brief description of the drawings
Fig. 1：The structural representation of the equipment therefor of embodiment 2, wherein, 1 is CO2Gas cylinder, 2 be additive tank, and 3 be crude oil
Tank, 4 be booster pump, and 5 be high pressure pump, and 6 be air accumulator, and 7 be High-pressure phase equilibria kettle, and 8 be pressure gauge, and 9 be pressure maintaining valve, 10
It is liquid-phase collection device for atmospheric valve, 11,12 be gas phase receiving flask, and 13 be mass flowmenter.
Fig. 2：The result schematic diagram of embodiment 2, wherein, abscissa is chemical addition agent addition, unit %；Ordinate
For CO2Mass percent in viscous crude, unit %.
Embodiment
With reference to embodiment, the present invention is further illustrated.
Involved instrument, reagent, material etc. in following embodiments, it is existing in the prior art unless otherwise noted
Conventional instrument, reagent, material etc., can be obtained by regular commercial sources.Involved experimental method in following embodiments,
Detection method etc., it is existing normal experiment method, detection method etc. in the prior art unless otherwise noted.
Embodiment 1 prepares oil driving additive and determines its viscosity-reducing performance to crude oil
Oil driving additive, by solubilizer p-methylbenzoic acid propyl ester and thinner octadecyl acrylate-vinylacetate-the third
Acrylamide copolymer forms, and the weight ratio of solubilizer and thinner is 4:1.Solubilizer and thinner are added into beaker, room
Lower stirring more than the 1h of temperature makes it be sufficiently mixed uniformly, stands, produces oil driving additive.
The preparation method of the octadecyl acrylate-vinyl acetate-acrylamide copolymer is：Equipped with condenser,
In the 150ml three-necked flasks of thermometer and mechanical stirring device, 80ml toluene is added as reaction dissolvent, is added successively afterwards
Enter total amount 10g, mol ratio 2:3:5 octadecyl acrylate, vinylacetate and acrylamide, and raw material gross weight 5%
Initiator azodiisobutyronitrile, lead to N2After displacing the air in reaction bulb, stirring is warming up to 70 DEG C, constant temperature back flow reaction
After 10h, remove reaction bulb and be placed in natural cooling at room temperature, the rear 30ml methanol that adds precipitates copolymer, after filtering at 50 DEG C
24h is dried in vacuo, the higher octadecyl acrylate-vinyl acetate-acrylamide copolymer of purity is produced, seals up for safekeeping stand-by.
Viscosity break ratio of the oil driving additive to crude oil is prepared using rotation viscometer method measure, wherein oil sample used is sieve
322 dune shape viscous crude, its four component composition respectively asphalitine 23.6%, colloid 30.1%, saturation point 35.2, fragrance point
11.1%.Before experiment, viscous crude sample about 80g or so is taken in 100mL beakers, using 100 DEG C of stirring 1h of oil bath pan constant temperature, is made
It is fully mixed.Take out, be placed in Temperature fall at room temperature.Sample is placed in oil bath pan, and is placed on rotation viscometer and turns
Immediately below sub, adjustment rotors normal highly protrudes into viscous crude, and constant temperature is opened rotation viscometer and measured afterwards for a period of time.
Due to the characteristic of non-newtonian fluid, rotating speed, rotor model and testing time when the viscosity of viscous crude sample and measurement etc. are all close
Cut is closed.The 3min of time of measuring selection in the present embodiment, rotor speed are set to 5r/min, every time record data after measurement.Examine
The influence of temperature and oil driving additive addition to viscosity break ratio is examined, wherein each transformation temperature is both needed to more than constant temperature 1h, and the displacement of reservoir oil
Additive needs to be stirred continuously after adding makes it be sufficiently mixed uniformly rear re-test.Table 1 for add oil driving additive before and after viscosity and
Viscosity break ratio with temperature test result, table 2 be at 100 DEG C viscosity break ratio with oil driving additive addition test result.Can be with from table
See, the oil driving additive viscosity reducing effect is obvious, and oil driving additive addition is 5%, and viscosity break ratio can when temperature is 103.47 DEG C
Reach 81.67%.
Viscosity and viscosity break ratio are with temperature test result before and after the addition oil driving additive of table 1
Viscosity break ratio is with oil driving additive addition test result at 2 100 DEG C of table
Embodiment 2 tests oil driving additive to promoting CO2It is dissolved in the performance of viscous crude
Oil driving additive used is consistent with embodiment 1.Inspection apparatus air-tightness is needed before experiment, toward autoclave in be passed through CO2,
2h is kept under 25MPa, if pressure oscillation is no more than 1%, it is believed that air-tightness is good.During experiment, 25 g viscous crude are first weighed
In in equilibrium still, CO is opened2Sampling valve and gas phase sampling valve, with 100~200ml/min CO210min, emptying are swept in air-blowing
Air in kettle, all valves are closed afterwards.Water bath with thermostatic control is opened, pressure is risen into 15MPa, stirring balance more than 1h reaches it
To vapor liquid equilibrium.Afterwards, crack liquid phase sampling valve, about 20mg liquid phase samples are taken out, and the gas flow of release is measured, mistake
Cheng Zhongke maintains pressure in kettle constant by joystick.Need at least it be repeated twice per sub-sampling, to reduce random error.The displacement of reservoir oil
Additive is injected in kettle by high pressure pump, needs to be corrected additive volume before injection every time.With oil driving additive
Increase, CO2Meltage is substantially increased in viscous crude, but addition no longer changes substantially more than 5% or so meltage, is respectively added
Enter the CO under amount2Mass percent is respectively 1.23% (0%) in viscous crude, 6.78% (2.79%), 9.10% (5.42%)
With 9.45% (7.91%), addition is represented in its bracket.When addition is 5%, CO2Meltage can improve 6.4 times.
Embodiment 3 prepares oil driving additive and determines its performance
Oil driving additive, by solubilizer p-methylbenzoic acid propyl ester and thinner dodecyl acrylate-vinylacetate-the third
Acrylamide copolymer forms, and the weight ratio of solubilizer and thinner is 4:1.Solubilizer and thinner are added into beaker, room
Lower stirring more than the 1h of temperature makes it be sufficiently mixed uniformly, stands, produces oil driving additive.
The preparation method of the dodecyl acrylate-vinyl acetate-acrylamide copolymer is：Equipped with condenser,
In the 150ml three-necked flasks of thermometer and mechanical stirring device, 80ml toluene is added as reaction dissolvent, is added successively afterwards
Enter total amount 10g, mol ratio 2:3:5 dodecyl acrylate, vinylacetate and acrylamide, and raw material gross weight 5%
Initiator azodiisobutyronitrile, lead to N2After displacing the air in reaction bulb, stirring is warming up to 70 DEG C, constant temperature back flow reaction
After 10h, remove reaction bulb and be placed in natural cooling at room temperature, the rear 30ml methanol that adds precipitates copolymer, after filtering at 50 DEG C
24h is dried in vacuo, dodecyl acrylate-vinyl acetate-acrylamide copolymer is produced, seals up for safekeeping stand-by.
The method of its viscosity-reducing performance is determined with embodiment 1, is as a result shown, when oil driving additive addition is 5% at 100 DEG C
Viscosity break ratio is 84.2%.
It is tested to promoting CO2The performance of viscous crude is dissolved in, as a result method shows the CO under each addition with embodiment 22
Mass percent is respectively 1.33% (0%) in viscous crude, 7.25% (2.10%), 8.65% (5.33%) and 9.07%
(7.54%) addition, is represented in its bracket.When addition is 5%, CO2Meltage can improve 3 times.
Embodiment 4 prepares oil driving additive
Oil driving additive, by solubilizer p-methylbenzoic acid butyl ester and thinner tetradecyl acrylate-vinylacetate-the third
Acrylamide copolymer forms, and the weight ratio of solubilizer and thinner is 2:1.Solubilizer and thinner are added into beaker, room
Lower stirring more than the 1h of temperature makes it be sufficiently mixed uniformly, stands, produces oil driving additive.
The preparation method of the tetradecyl acrylate-vinyl acetate-acrylamide copolymer is：Equipped with condenser,
In the 150ml three-necked flasks of thermometer and mechanical stirring device, 80ml toluene is added as reaction dissolvent, is added successively afterwards
Enter total amount 10g, mol ratio 6:1:8 tetradecyl acrylate, vinylacetate and acrylamide, and raw material gross weight 5%
Initiator azodiisobutyronitrile, lead to N2After displacing the air in reaction bulb, stirring is warming up to 70 DEG C, constant temperature back flow reaction
After 10h, remove reaction bulb and be placed in natural cooling at room temperature, the rear 30ml methanol that adds precipitates copolymer, after filtering at 50 DEG C
24h is dried in vacuo, tetradecyl acrylate-vinyl acetate-acrylamide copolymer is produced, seals up for safekeeping stand-by.
Embodiment 5 prepares oil driving additive
Oil driving additive, by solubilizer p-methylbenzoic acid heptyl ester and thinner Process Conditions of Cetane Acrylate-vinylacetate-the third
Acrylamide copolymer forms, and the weight ratio of solubilizer and thinner is 8:1.Solubilizer and thinner are added into beaker, room
Lower stirring more than the 1h of temperature makes it be sufficiently mixed uniformly, stands, produces oil driving additive.
The preparation method of the Process Conditions of Cetane Acrylate-vinyl acetate-acrylamide copolymer is：Equipped with condenser,
In the 150ml three-necked flasks of thermometer and mechanical stirring device, 80ml toluene is added as reaction dissolvent, is added successively afterwards
Enter total amount 10g, mol ratio 4:5:2 Process Conditions of Cetane Acrylate, vinylacetate and acrylamide, and raw material gross weight 5%
Initiator azodiisobutyronitrile, lead to N2After displacing the air in reaction bulb, stirring is warming up to 70 DEG C, constant temperature back flow reaction
After 10h, remove reaction bulb and be placed in natural cooling at room temperature, the rear 30ml methanol that adds precipitates copolymer, after filtering at 50 DEG C
24h is dried in vacuo, Process Conditions of Cetane Acrylate-vinyl acetate-acrylamide copolymer is produced, seals up for safekeeping stand-by.
Although above-mentioned the embodiment of the present invention is described in conjunction with the embodiments, not the present invention is protected
The limitation of scope, one of ordinary skill in the art should be understood that on the basis of technical scheme, people in the art
Member need not pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (10)
1. one kind enhancing CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, it is characterised in that：It is molten by solubilizer and oil
Property thinner composition, the weight ratio of solubilizer and oil-soluble viscosity reducer is 2~8:1；Wherein, the solubilizer is to methylbenzene first
Acid esters compound, its structural formula is as follows, and in structural formula, n is 2~12 integer；
The oil-soluble viscosity reducer is acrylate long-chain ester-vinyl acetate-acrylamide copolymer, the following institute of its structural formula
Show：
In formula ,-R represents saturated alkyl chain, and its C atomicity is 12~18；i:j:K=(2~6):(1~5):(2~8).
2. enhancing CO according to claim 12Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, and its feature exists
In：The weight ratio of the solubilizer and oil-soluble viscosity reducer is 4:1.
3. enhancing CO according to claim 12Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, and its feature exists
In：The solubilizer is p-methylbenzoic acid propyl ester.
4. enhancing CO according to claim 12Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, and its feature exists
In：The thinner is octadecyl acrylate-vinyl acetate-acrylamide copolymer.
5. the enhancing CO according to claim 1 or 42Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, its feature
It is：Acrylate long-chain ester-the vinyl acetate-acrylamide copolymer, is prepared by the following method to obtain：With third
Olefin(e) acid Arrcostab, vinylacetate and acrylamide are raw material, and three's mol ratio is (2~6):(1~5):(2~8), with toluene
For solvent, initiator azodiisobutyronitrile is added, under nitrogen atmosphere, 8~12h of reaction is stirred at reflux under the conditions of 65~75 DEG C,
Obtain terpolymer；Room temperature is naturally cooled to, adding methanol precipitates copolymer, filters, and is dried in vacuo at 50 DEG C ± 3 DEG C, i.e.,
Obtain acrylate long-chain ester-vinyl acetate-acrylamide copolymer.
6. enhancing CO according to claim 52Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, and its feature exists
In：The dosage of the azodiisobutyronitrile is the 5% of raw material gross weight.
7. enhancing CO according to claim 52Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil, and its feature exists
In：The preparation method of the octadecyl acrylate-vinyl acetate-acrylamide copolymer is：Equipped with condenser, thermometer
And in the 150ml three-necked flasks of mechanical stirring device, 80ml toluene is added as reaction dissolvent, sequentially adds total amount afterwards
10g, mol ratio 2:3:5 octadecyl acrylate, vinylacetate and acrylamide, and the initiation of raw material gross weight 5%
Agent azodiisobutyronitrile, lead to N2After displacing the air in reaction bulb, stirring is warming up to 70 DEG C, after constant temperature back flow reaction 10h, moves
Go out reaction bulb and be placed in natural cooling at room temperature, the rear 30ml methanol that adds precipitates copolymer, is dried in vacuo after filtering at 50 DEG C
24h, produce.
8. enhancing CO according to any one of claims 1 to 72Dissolve each other, reduce with crude oil viscosity of crude oil driving additive system
Preparation Method, it is characterised in that：Solubilizer is mixed with thinner, more than 1h is stirred at room temperature, produces.
9. enhancing CO according to any one of claims 1 to 72Dissolve each other, reduce with crude oil viscosity of crude oil driving additive in depth
Layer viscous crude CO2Application in the harvesting of gas drive process, it is characterised in that：By injecting stratum with note or preposition mode.
10. application according to claim 9, it is characterised in that：When being injected in a manner of with note, the total use of oil driving additive
Measure the CO used for the displacement of reservoir oil2The 3%~8% of total amount；When being injected in a manner of preposed attributives, before the total usage amount of oil driving additive is
Put CO in slug layer2The 5%~30% of total amount.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113773824A (en) * | 2020-06-09 | 2021-12-10 | 中国石油化工股份有限公司 | Thickened oil viscosity-reducing synergistic composition and preparation method and application thereof |
| CN113861049A (en) * | 2021-10-22 | 2021-12-31 | 中国石油化工股份有限公司 | CO (carbon monoxide)2Solubilization viscosity reducer and preparation method and application thereof |
| CN114853935A (en) * | 2022-05-23 | 2022-08-05 | 沧州中润化学助剂有限公司 | Enhanced CO 2 Oil displacement additive capable of being mutually dissolved with crude oil and reducing crude oil viscosity and preparation method thereof |
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| CN113773824A (en) * | 2020-06-09 | 2021-12-10 | 中国石油化工股份有限公司 | Thickened oil viscosity-reducing synergistic composition and preparation method and application thereof |
| CN113773824B (en) * | 2020-06-09 | 2023-04-07 | 中国石油化工股份有限公司 | Thickened oil viscosity-reducing synergistic composition and preparation method and application thereof |
| CN113861049A (en) * | 2021-10-22 | 2021-12-31 | 中国石油化工股份有限公司 | CO (carbon monoxide)2Solubilization viscosity reducer and preparation method and application thereof |
| CN113861049B (en) * | 2021-10-22 | 2024-03-22 | 中国石油化工股份有限公司 | CO (carbon monoxide) 2 Solubilizing viscosity reducer and preparation method and application thereof |
| CN114853935A (en) * | 2022-05-23 | 2022-08-05 | 沧州中润化学助剂有限公司 | Enhanced CO 2 Oil displacement additive capable of being mutually dissolved with crude oil and reducing crude oil viscosity and preparation method thereof |
| CN114853935B (en) * | 2022-05-23 | 2023-02-17 | 沧州中润化学助剂有限公司 | Enhanced CO 2 Oil displacement additive capable of being mutually dissolved with crude oil and reducing crude oil viscosity and preparation method thereof |
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