CN106117439B - A kind of polymer displacement of reservoir oil agent solution based on fluorine-containing water-soluble dissaving polymer - Google Patents
A kind of polymer displacement of reservoir oil agent solution based on fluorine-containing water-soluble dissaving polymer Download PDFInfo
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Abstract
The invention discloses a kind of polymer displacement of reservoir oil agent solutions based on fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer.The structural formula of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer as shown in formula I, wherein, core A be end group hydroxyl cyclodextrin polymer；Arm B is the copolymer being in turn connected to form by acrylamide acrylic acid sodium random copolymer segment, poly- fluorine-containing hydrophobic segment and poly- both sexes multijaw type hydrophobic function segment, and the other end of the acrylamide acrylic acid sodium random copolymer segment is grafted on the core A.The fluorine-containing water-soluble dissaving polymer oil displacement agent of the present invention is different according to monomer type, series of products can be obtained, and building-up process normal temperature and pressure, step are simply amplified, water phase free radical polymerization green non-pollution, and thickening and anti-shear performance with better than plain polypropylene amide polymer.
Description
Technical field
It is the present invention relates to a kind of polymer displacement of reservoir oil agent solution based on fluorine-containing water-soluble dissaving polymer, i.e., fluorine-containing water-soluble
Application of the property dissaving polymer in polymer displacement of reservoir oil, belongs to oil field displacement of reservoir oil field.
Background technology
The poly- raising recovery efficiency technique that drives is one of important technology of production and steady oil control water in the increasing the storage of oil field.Polymer flooding oil body
System is basis and the core of poly- drive technology, and application at present is as extensive for partially hydrolyzed polyacrylamide (PHPA) Type of Collective object.One side
In oil displacement process mechanical degradation, thermal degradation, microbial degradation and chemistry often occur for face, polyacrylamide polymer
Degradation etc., causes solution viscosity to decline, and oil displacement efficiency reduces, and wherein mechanical shearing degradation is particularly acute, and has been reported that display, is injected
The high speed shear of mechanical pump can be such that solution viscosity declines up to more than 70%, viscosity retention ratio only 30%.On the other hand, with technology
It is increasingly mature, the oil reservoir of poly- drive technology application also by a kind of oil reservoir, gradually to condition it is poor two, three classes oil reservoir expand, to poly-
Close also increasingly increasing for object stability.It designs and prepares the polymer with good thickening and anti-shear performance to improving polymer
Oil displacement efficiency has a very important significance.
The content of the invention
The object of the present invention is to provide a kind of polymer displacement of reservoir oil agent solutions based on fluorine-containing water-soluble dissaving polymer, contain
Application of the fluorine water-soluble ultrabranching polymer in polymer displacement of reservoir oil, the fluorine-containing water-soluble ultrabranching multi-arm poly- third that the present invention uses
Acrylamide polymer displacement of reservoir oil agent solution has higher viscosity and stronger anti-shear performance.
The fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer of the present invention can be used for preparing the polymer flooding displacement of reservoir oil
Agent.
The structural formula of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is as shown in formula I：
Core A：● arm B：
Wherein, core A is the cyclodextrin polymer of end group hydroxyl；
Arm B is to be dredged by acrylic amide-acrylic sodium random copolymer segment, poly- fluorine-containing hydrophobic segment and poly- both sexes multijaw type
The copolymer that water function segment is in turn connected to form, and the other end of the acrylic amide-acrylic sodium random copolymer segment
It is grafted on the core A.
The viscosity average molecular weigh of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is 3,000,000~1000
Ten thousand, such as 10,000,000；
The degree of hydrolysis of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is 20%~40%, such as
27%；
The core A, the acrylic amide-acrylic sodium random copolymer segment described gather fluorine-containing hydrophobic segment and described
The mass ratio of poly- both sexes multijaw type hydrophobic function segment can be 1：220~350：5~15：6~18, concretely 1：280：8.4
~8.5：10.5~10.6,1：280：8.5：10.6 or 1：280：8.4：10.5.
The poly- fluorine-containing hydrophobic segment is polymerize to obtain by fluorine-containing hydrophobic monomer；
The fluorine-containing hydrophobic monomer can be hexafluorobutyl acrylate, Hexafluorobutyl mathacrylate, methacrylic acid 13
At least one of fluorine monooctyl ester, dodecafluorhe-ptylacrylate, dodecafluoroheptyl methacrylate and trifluoroethyl methacrylate；
The poly- both sexes multijaw type hydrophobic function can be acrylic acid bromo shown in acrylic acid glycine betaine shown in formula II or formula III
Quaternary ammonium salt：
In formula II, n is the number between 1~8；
In formula III, p is the number between 11~17.
The cyclodextrin polymer of the end group hydroxyl is prepared according to the method included the following steps：
In alkaline conditions, cyclodextrin is reacted with epoxychloropropane to obtain the final product；
The cyclodextrin is beta-cyclodextrin.
The mass ratio of the cyclodextrin and the epoxychloropropane can be 1：0.2~0.3, concretely 1：0.24；
The temperature of the reaction can be 45~55 DEG C, when the time can be 5~8 small, when reaction 6 is small such as at 50 DEG C；
The alkaline condition transfers in capable regulation and control by sodium hydrate aqueous solution, and the quality percentage of the sodium hydrate aqueous solution contains
It measures as 0.5~2%.
When the fluorine-containing water-soluble dissaving polymer of the present invention is as polymer oil-displacing agent, compound concentration scope is 1200~
3000mg/L, such as 1750mg/L.
The fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer of the present invention can pass through method comprising the following steps
It prepares：
(1) under an inert atmosphere, the cyclodextrin polymer of the end group hydroxyl is reacted with redox initiator, is obtained
Reaction solution 1；
(2) acrylamide monomer, fluorine-containing hydrophobic monomer, both sexes multijaw type is slowly added to successively into the reaction solution 1 to dredge
Water function monomer carries out graft copolymerization；
(3) sodium hydroxide is added in into the reaction system of step (2), reaction is hydrolyzed to get the polymer.
In above-mentioned preparation method, in step (1), the redox initiator may be selected from following at least one：Nitric acid
Cerium ammonium, potassium peroxydisulfate, ammonium persulfate, sodium peroxydisulfate and hydrogen peroxide；
The redox initiator participates in reacting in the form of its aqueous solution, in the aqueous solution, the redox
The mass percent concentration of initiator can be 0.5%~3%, concretely 1.5%；
The mass ratio of the redox initiator and the cyclodextrin polymer of the end group hydroxyl can be 1.5~3：1, specifically
Can be 2.4：1；
The temperature of the reaction can be 30~50 DEG C, and the time can be 30~60min, can specifically be reacted under conditions of 40 DEG C
40min。
In above-mentioned preparation method, in step (2), the acrylamide monomer is in the form of acrylamide monomer aqueous solution
It adding in, the mass percent concentration of the acrylamide monomer aqueous solution can be 20~30%, concretely 25%；
The fluorine-containing hydrophobic monomer is added in the form of emulsion, the emulsion using lauryl sodium sulfate and water into
Row is prepared, and in the emulsion, the mass percent concentration of the fluorine-containing hydrophobic monomer can be 2~10%, and concretely 5%；
The both sexes multijaw type hydrophobic function monomer is added in the form of both sexes multijaw type hydrophobic function monomer solution, institute
The mass concentration for stating both sexes multijaw type hydrophobic function monomer solution can be 2~10%, concretely 5%.
In above-mentioned preparation method, the cyclodextrin polymer of the end group hydroxyl, the acrylamide monomer described fluorine-containing are dredged
The mass ratio of aqueous monomer and the both sexes multijaw type hydrophobic function monomer can be 1 successively：250~400：8~20：8~20, specifically
Can be 1：300：10：12；
The temperature of the graft copolymerization can be 45~75 DEG C, and the time can be 5~10h, anti-such as under conditions of 55 DEG C
Answer 6h.
In above-mentioned preparation method, in step (3), the additive amount of the sodium hydroxide can be the quality of acrylamide monomer
10%~20%, concretely 16.7%；
The temperature of the hydrolysis can be 90 DEG C~120 DEG C, and when the time can be 1~3 small, it is small that 3 are carried out such as at 120 DEG C
When.
The present invention has following beneficial aspects：
The fluorine-containing water-soluble dissaving polymer oil displacement agent of the present invention is different according to monomer type, can obtain series of products, and close
Into process normal temperature and pressure, step is simply amplified, water phase free radical polymerization green non-pollution, and with better than plain polypropylene
The thickening and anti-shear performance of amide polymer.
Description of the drawings
Fig. 1 is the thickening property figure of fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer prepared by the present invention.
Fig. 2 is the anti-shear performance of fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer prepared by the present invention
Figure.
Fig. 3 is the HNMR nuclear-magnetism figures of acrylic acid glycine betaine monomer.
Fig. 4 is the HNMR nuclear-magnetism figures of acrylic acid bromo quaternary ammonium salt monomer.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
HCD employed in following embodiments is prepared as steps described below：
5.0g β-CD, 25% NaOH solution of 7.5mL and 15mL water are added in, when stirring 1 is small, is slowly added dropwise very much
The epoxychloropropane of 1.0mL (1.18g) after being added dropwise, is stirred to react 6h, system 100mL third energetically at a temperature of 50 DEG C
Ketone precipitates, obtained white solid, the water of crude product 100mL：Ethyl alcohol=1:It is unreacted that 2 mixed solution cleans removing repeatedly
CD and propylene oxide class monomer, last white solid is with obtaining the product in a vacuum and drying environment HCD.
Acrylic acid glycine betaine monomer (n=1) employed in following embodiments is prepared by the following method：Add in 5.0mL
Monomer 2- (dimethylamino) ethylmethyl acrylate, the acetone of 25.0mL, are added dropwise 1, the 3- propane sultones containing 2.6mL
Acetone soln 10mL.After being added dropwise, be warming up to 40 DEG C, be stirred to react 10 it is small when, system generates a large amount of white solids, after cooling
Filtering, crude product cleans the unreacted monomer of removing repeatedly with the acetone of 20mL and sultones, last white solid are done with vacuum
Dry to obtain product, HNMR nuclear-magnetism figures are as shown in Figure 3.
Acrylic acid bromo quaternary ammonium salt monomer (n=16) employed in following embodiments is prepared by the following method：It adds in
5.0mL monomers 2- (dimethylamino) ethylmethyl acrylate, the acetone of 40.0mL, are added dropwise the bromo n-octadecane containing 9.9g
Acetone soln 10mL.After being added dropwise, be warming up to 40 DEG C, be stirred to react several 10-20 it is small when, system generates a large amount of white solids,
Cooled and filtered, crude product with the acetone of 100mL are cleaned and remove unreacted monomer and bromo n-octadecane repeatedly, and last white is solid
For body with obtaining the product in a vacuum and drying environment, HNMR nuclear-magnetism figures are as shown in Figure 4.
To avenge good fluorine chemistry of silicones Products, reagent contracts dodecafluoroheptyl methacrylate employed in following embodiments
DFBMA is write, CAS registration numbers are 2261-99-6.
Embodiment 1 prepares fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer
By 30mg parent nucleus HCD, 95mL H2O is placed in three-necked flask, stirring and dissolving, is passed through nitrogen deoxygenation 45min, then
Ammonium ceric nitrate aqueous solution (72mg ammonium ceric nitrates are dissolved in 4.7mL water) is added under nitrogen protection, is stirred to react at 40 DEG C
30min is slowly added to acrylamide aqueous solution (9.0g acrylamides are dissolved in 27mL water), metering system into reaction solution successively
(300mg dodecafluoroheptyl methacrylate monomers are emulsifiable in 5.7mL water sour ten difluoro heptyl ester monomer emulsions, and emulsifier is
Dodecyl sodium sulfate 300mg), (360mg acrylic acid glycine betaine monomers are dissolved in 6.8mL water to acrylic acid glycine betaine monomer solution
In), be then warming up to 55 DEG C reaction 6 it is small when, into reaction solution add in 1.5g NaOH, at 120 DEG C hydrolyze 2 it is small when, drying,
Up to 1# water-soluble ultrabranching polymer, viscosity average molecular weigh is 10,000,000 or so, degree of hydrolysis 27%.
In 1# water-soluble ultrabranchings polymer manufactured in the present embodiment, HCD, acrylic amide-acrylic sodium random copolymer
The mass ratio of segment, ten difluoro heptyl ester segment of polymethylacrylic acid and polyacrylic acid glycine betaine segment is 1：280：8.5：10.6.
Embodiment 2 prepares fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer
By 30mg parent nucleus HCD, 95mL H2O is placed in three-necked flask, stirring and dissolving, is passed through nitrogen deoxygenation 45min, then
Ammonium ceric nitrate aqueous solution (72mg ammonium ceric nitrates are dissolved in 4.7mL water) is added under nitrogen protection, is stirred to react at 40 DEG C
30min is slowly added to acrylamide aqueous solution (9.0g acrylamides are dissolved in 27mL water), metering system into reaction solution successively
(300mg dodecafluoroheptyl methacrylate monomers are emulsifiable in 5.7mL water sour ten difluoro heptyl ester monomer emulsions, and emulsifier is
Dodecyl sodium sulfate 300mg), (360mg acrylic acid bromo quaternary ammonium salt monomers are dissolved in acrylic acid bromo quaternary ammonium salt monomer aqueous solution
In 6.8mL water), be then warming up to 55 DEG C of reactions 6 it is small when, 1.5g NaOH are added in into reaction solution, are hydrolyzed at 120 DEG C 2 small
When, it dries to get 2# water-soluble ultrabranching polymer, viscosity average molecular weigh is 10,000,000 or so, degree of hydrolysis 27%.
In 2# water-soluble ultrabranchings polymer manufactured in the present embodiment, HCD, acrylic amide-acrylic sodium random copolymer
The mass ratio of segment, ten difluoro heptyl ester segment of polymethylacrylic acid and polyacrylic acid bromo quaternary ammonium salt segment is 1：280：8.4：
10.5。
The performance test of embodiment 3, fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer
The performance of the 1# and 2# water-soluble ultrabranching polymer of the invention prepared is evaluated, evaluation method and result
As follows, wherein unaltered portion hydrolyzed polyacrylamide (i.e. " general polymer ") is industrialization product, and marque is
FP6050, purchased from French SNF companies, structure is linear straight chain type.
(1) thickening property：A certain amount of polymer is taken, under 45 DEG C of water bath conditions, various concentration is prepared with deionized water
Polymer solution, the relation of test polymer viscosity and concentration evaluates the thickening property of polymer, and the results are shown in Figure 1, and
It is compared with unaltered portion hydrolyzed polyacrylamide performance.
As shown in Figure 1：With the increase of concentration, the viscosity of the fluorine-containing dissaving polymer aqueous solutions of 1# and 2# dramatically increases,
When concentration is 2000mg/L, 1# and the fluorine-containing dissaving polymer solution viscosities of 2# may be up to 120 and 135mPas, remote high
In the 65.8mPas of unaltered portion hydrolyzed polyacrylamide.
(2) anti-shear performance：The polymer solution that aimed concn is 1500mg/L is taken, with the 1 grade of shearing of Rhein blender
20s measures its apparent viscosity before and after polymeric shear at different temperatures, calculates viscosity retention ratio, and the results are shown in Figure 2,
And it is compared with unaltered portion hydrolyzed polyacrylamide performance.
As shown in Figure 2：In concentrated water, after 1# and the fluorine-containing dissaving polymer solution of 2# are clipped, viscosity retains
Rate is maintained at 55% or so, higher than 40% or so of unaltered portion hydrolyzed polyacrylamide.
(3) Oil Displacing Capacity：Take the polymer solution that aimed concn is 1750mg/L, one grade of shearing 20s of Waring blenders
It is spare afterwards.Use for laboratory artificial core, gas permeability are respectively 500,2000 and 4000mD from top to bottom.With Bohai Sea oil field
Simulation oil is compounded after comprehensive oil sample dehydration with kerosene, 65 DEG C of viscosity are 70mPas.First carry out water drive, it is aqueous up to more than 98% when
Turn polymer flooding.Polymer and water drive velocity are 3m/d, and polymer solution injected slurry volume is 0.3PV.The experimental results showed that 1#
With the oil-recovering rate of the fluorine-containing water-soluble dissaving polymer solution of 2# 10 can be improved than unaltered portion hydrolyzed polyacrylamide
~15%.
In conclusion fluorine-containing water-soluble dissaving polymer provided by the invention is demonstrated by gathering better than unaltered portion hydrolysis
The viscosifying of acrylamide, anti-shearing and Oil Displacing Capacity, are expected to be used for polymer displacement of reservoir oil.
Claims (1)
1. fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is in polymer displacement of reservoir oil or as the application in oil displacement agent；
The structural formula of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is as shown in formula I：
Wherein, core A is the cyclodextrin polymer of end group hydroxyl；
The cyclodextrin polymer of the end group hydroxyl is prepared according to the method included the following steps：
In alkaline conditions, cyclodextrin is reacted with epoxychloropropane to obtain the final product；
The cyclodextrin is beta-cyclodextrin；
The mass ratio of the cyclodextrin and the epoxychloropropane is 1：0.2~0.3；
The temperature of the reaction is 45~55 DEG C, when the time is 5~8 small；
Arm B is by acrylic amide-acrylic sodium random copolymer segment, gathers fluorine-containing hydrophobic segment and the poly- hydrophobic work(of both sexes multijaw type
The copolymer that energy segment is in turn connected to form, and the other end grafting of the acrylic amide-acrylic sodium random copolymer segment
Onto the core A；
The core A, the acrylic amide-acrylic sodium random copolymer segment, the poly- fluorine-containing hydrophobic segment and described poly- two
Property multijaw type hydrophobic function segment mass ratio be 1：220~350：5~15：6~18；
The poly- fluorine-containing hydrophobic segment is polymerize to obtain by fluorine-containing hydrophobic monomer；
The fluorine-containing hydrophobic monomer for hexafluorobutyl acrylate, Hexafluorobutyl mathacrylate, ten trifluoro monooctyl ester of methacrylic acid,
At least one of dodecafluorhe-ptylacrylate, dodecafluoroheptyl methacrylate and trifluoroethyl methacrylate；
The poly- both sexes multijaw type hydrophobic function is acrylic acid bromo quaternary ammonium salt shown in acrylic acid glycine betaine shown in formula II or formula III：
In formula II, n is the number between 1~8；
In formula III, p is the number between 11~17；
The viscosity average molecular weigh of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is 3,000,000~10,000,000；
The degree of hydrolysis of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is 20%~40%；
The concentration of the fluorine-containing water-soluble ultrabranching multi-arm polyacrylamide polymer is 1200~3000mg/L.
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| EP2604636A1 (en) * | 2011-12-15 | 2013-06-19 | Stichting Dutch Polymer Institute | Enhanced oil recovery using polyacrylamides |
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| EP2604636A1 (en) * | 2011-12-15 | 2013-06-19 | Stichting Dutch Polymer Institute | Enhanced oil recovery using polyacrylamides |
| CN104844760A (en) * | 2015-05-18 | 2015-08-19 | 中国海洋石油总公司 | Water-soluble hyper-branched polymer oil displacement agent and preparation method thereof |
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