CN106350049A - Method for improving polymer flooding effect, and polymer flooding composition and application thereof - Google Patents
Method for improving polymer flooding effect, and polymer flooding composition and application thereof Download PDFInfo
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- CN106350049A CN106350049A CN201610616313.9A CN201610616313A CN106350049A CN 106350049 A CN106350049 A CN 106350049A CN 201610616313 A CN201610616313 A CN 201610616313A CN 106350049 A CN106350049 A CN 106350049A
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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Abstract
A method for improving polymer flooding effect comprises: injecting core-shell microgel and a polymer at a volume ratio of 1:100 to 1:1 during polymer flooding. By using the method of the application to improve polymer flooding effect, it is possible to increase retention rate of polymer molecules in a deep formation, channeling of a polymer solution is under control, and polymer utilization rate is increased; the comprehensive effect of polymer flooding is improved without increasing polymer flooding cost.
Description
Technical field
The application relates to, but are not limited to poly- drive oil recovery technique field, is more particularly without limitation, to one kind and improves polymer poly drive
The method of effect and a kind of poly- drive compositionss and application thereof.
Background technology
Polymer flooding started, since China land, the oil field promotion and implementation of the marine main force, to have achieved from the nineties in last century
Huge economic and social benefit, it has also become currently one of international and domestic main technology of raising recovery ratio.Polymer flooding becomes
What work(was implemented it is critical only that the lifting delay in underground for the polymer molecule, the particularly hold-up in earth formation deep moveable oil area, increases
Plus the displacement resistance of displacing fluid, start water drive and do not involve hole.But rush due to formation heterogeneity and by early stage water filling
The impact of the dominant flowing path that scopiform becomes, polymer molecule can be broken through rapidly to producing well, does not play its effective displacement
Effect, causes the poly- implementation result that drives to be deteriorated, input-output ratio reduces.
For delaying polymer to break through, currently mainly take: 1. add cross-linking agent to form network cross linked polymers (weak) gel,
By the space occupy-place of large scale molecule, formed in formation pore and be detained；2. alternately inject part cationic polymer, utilize
The electronegative property of conventional polymer, is acted on by charge adsorption, delays polymer to break through.But both approaches all have one
Fixed defect: if adding cross-linking agent, due to the chromatographic fractionation effect between cross-linking agent and polymer macromolecule, real in earth formation deep
Border plastic effect is limited it is difficult to real realize effectively being detained on purpose stratum；If addition cationic polymer, due to stratum itself
Negatively charged, cationic polymer is inevitably present the absorption and stratum between, is adsorbing toward in earth formation deep mass transport process
Loss is huge, similarly there is a problem of limited to flooding polymers trapping ability in earth formation deep.As time goes on, closely
Well band remaining oil saturation is more and more lower, and both approaches are all difficult to really lift the delay energy in earth formation deep for the polymer molecule
Power, causes implementation result worse and worse.
Accordingly, it would be desirable to develop a kind of method improving polymer polymer flooding effect that can meet existing situation demand.
Content of the invention
This application provides a kind of method improving polymer polymer flooding effect, methods described is included core during poly- drive
Shell microgel and polymer press the volume ratio injection of 1:100～1:1.
Nucleocapsid microgel used in this application is that internal is cation with nucleocapsid structure, shell band anion, and
The material of releasably internal cation after water suction, the complete hydration swelling time is 30 days about.Core used in this application
Shell microgel can be the material being prepared using method as known in the art, such as adopt Application No.
The nucleocapsid of the method preparation disclosed in the Chinese patent of 200510107824.x is from knot acrylamide copolymer.
In some embodiments, described nucleocapsid microgel and the volume ratio of polymer can be 1:50～1:2.
In some embodiments, described nucleocapsid microgel and the volume ratio of polymer can be 1:2.
In some embodiments, described injection for alternately injecting or can be injected simultaneously into.
In some embodiments, described injection can be for alternately injecting.
In some embodiments, described polymer can be PAMA, PAMA
Modified salt-resistant polymer or the hydrophobic associated polymer of PAMA.
The modified salt-resistant polymer of PAMA used herein and hydrophobic associated polymer are often
Rule commercially available prod.For example, the hydrophobic associated polymer of described PAMA can be ap-p4.
In some embodiments, the initial particle of described nucleocapsid microgel can be 300-1500nm, after expanding completely
Can reach some tens of pm.
Present invention also provides a kind of poly- drive compositionss, described compositionss include nucleocapsid microgel and polymer, and institute
State nucleocapsid microgel by water solublity neutral monomer acrylamide and ion monomer i and cross-linking agent copolymer group nucleation portion, wherein
The mass ratio of acrylamide monomer and ion monomer i is 1:20～30:1, cross-linked dosage be nuclear monomer gross mass 0.0001～
15wt%；Shell parts, wherein propylene are constituted with ion monomer ii and cross-linking agent copolymer by water solublity neutral monomer acrylamide
The mass ratio of amide monomer and ion monomer ii is 1:20～30:1, cross-linked dosage be shell monomer gross mass 0.0001～
15wt%；Ion monomer i and ion monomer ii has opposite charges；
Described ion monomer i is selected from beta-amido ethylacrylic acid hydrochlorate, beta-amido ethylacrylic acid sulfate, methyl
Acrylyl oxy-ethyl-trimethyl salmiac, n, n- dimethylamino ethyl acrylic acid hydrochloride, n, n- dimethylamino ethyl acrylic acid
Sulfate, beta-amido ethyl methacrylate sulfate, allyl amine salt, allyl alkyl salt, (methyl) acrylate quaternary amine
At least one in the group that salt, methylacryoyloxyethyl dimethylbutyl ammonium bromide are formed；
Described ion monomer ii is selected from acrylic acid or acrylates, methacrylic acid or methacrylate, 2- propylene
At least one in the group that amide groups -2- methyl propane sulfonic acid salt, alpha-alkene sulfonate, β-allylsulfonate are formed.
In some embodiments, described nucleocapsid microgel and the volume ratio of polymer can be 1:100～1:1.
The application also provides and gathers the purposes driving compositionss as oil displacement agent during poly- drive as above.
The mechanism of action of the application is: nucleocapsid microgel shell is anion, and surface of stratum itself is negatively charged, and nucleocapsid is micro- solidifying
The shell of glue is little to the adsorbance on stratum.With entering earth formation deep, nucleocapsid microgel absorbs water, and then discharges its internal sun
Ion, these cationes are strong Sticking factors, therefore both can adsorb and produce " grappling " effect on reservoir rockses surface, also can be with
Polymer produces charges of different polarity sucking action, increases the delay in earth formation deep for the polymer molecule, improves displacement efficiency, should simultaneously
The nucleocapsid microgel particle diameter of itself such as can reach at the pore scale, underground is gathered and drives dominant flowing path and have plugging action, enter
Subsequent polymer solution is turned to the stratum of high remaining oil saturation by one step, expands the poly- swept volume driving, lifts polymer flooding
Implementation result.
The application has the advantage that
(1) increase the hold-up in earth formation deep for the polymer molecule, control polymer solution to alter into the profit of lifting polymer
Use efficiency.
(2) on the basis of not increasing poly- drive cost, the poly- resultant effect driving of lifting.
Brief description
Fig. 1 is embodiment 1 and comparative example 1 pressure variation in injection process.
Fig. 2 is embodiment 1 and comparative example 1 moisture content in injection process and recovery ratio variation diagram.
Fig. 3 is the outward appearance comparison diagram after poly- drive terminates for the rock core of embodiment 1 and comparative example 1.
Specific embodiment
Below by embodiment, presently filed embodiment to be described, it will be appreciated by the person skilled in the art that these
The enforcement technical scheme that specific embodiment only indicates that to reach the purpose of the application and selects, is not to technical scheme
Limit.According to teachings of the present application, it is obvious in conjunction with prior art to the improvement of technical scheme, belongs to the application
The scope of protection.
Raw material used in following examples or reagent, if no special instructions, are conventional commercial product.
Embodiment 1
According to the method disclosed in the Chinese patent of Application No. 200510107824.x, such as disclosed in embodiment 3
Method prepares nucleocapsid microgel.
Adopt three layers of heterogeneous body (hypotonic 0.75 μm of model of compacting of 4.5cm × 4.5cm × 30cm indoors2/ in ooze 2 μm2/
Hypertonic 6 μm2), according to method commonly used in the art by the anion poly- third of the nucleocapsid microgel prepared by 0.1pv and 0.2pv
Acrylamide is injected in rock core in the way of alternately injecting, and in particular first injects the nucleocapsid microgel of 0.1pv, reinjects 0.2pv
PAMA.
Embodiment 2
The present embodiment be to mix nucleocapsid microgel and PAMA with the difference of embodiment 1 after with
Concurrently injected mode is injected in rock core.
Comparative example 1
This comparative example is for the single PAMA of 0.3pv to inject rock with the difference of embodiment 1
In the heart.
Performance test
(1) pressure in injection process
It will be seen from figure 1 that in injection process there is very big diversity: single polymer in both on dynamic law
Drive after injection process terminates, assume pressure drop or fluctuation-type feature, this is because pressure is displaced with crude oil, show to gather
Compound is displaced quickly, also no longer has crude oil to be displaced, experiment in 3pv about terminate (aqueous more than 98%)；And embodiment 1
Injection process pressure during sequent water flooding persistently raises, and experiment still has crude oil to be displaced more than 10pv, this is because polymerization
Thing is trapped by the microgel of nucleocapsid structure in rock core, forms larger sized micelle or aggregate structure, increased polymer
Hold-up in rock core for the molecule, improves polymer flooding effect.
(2) Flooding Efficiency contrast
Table 1 represents the Flooding Efficiency of embodiment 1 and comparative example 1.
Table 1
| System | (displacement pressure maximum amplification), mpa | Recovery ratio improves, % |
| Embodiment 1 | 0.96 | 28.44 |
| Comparative example 1 | 0.70 | 17.90 |
As it can be seen from table 1 single polymer flooding can make recovery ratio improve 17.90%, and embodiment 1 is adding nucleocapsid
Recovery ratio can be made after microgel to improve 28.44%, lifting effect is apparent, illustrates that the addition of nucleocapsid microgel is very
Effectively.
Figure it is seen that both reduce the effect of moisture content substantially close to, but the sequent water flooding process of embodiment 1
5pv can be reached, and the sequent water flooding process of single polymer flooding only 3pv about, show that the addition of nucleocapsid microgel is big
Extend greatly the effect duration of poly- drive effect, reduce migration velocity in rock core for the polymer.
(3) rock core after displacement
From figure 3, it can be seen that the rock core of embodiment 1 color after poly- drive terminates is more shallow, more totally, illustrate more former
Oil is gone out by displacement, i.e. the addition of microgel increased the polymer flooding effect of polymer flooding.
It will be understood by those of skill in the art that in the range of without departing from technical scheme, more than can be utilized
Disclosed technology contents and make a little change, modify and be the Equivalent embodiments of the application with the equivalent variations developing；
Meanwhile, the change of any equivalent variations, modification and differentiation that all substantial technological according to the application are made to above example etc.
All in the range of being defined by the claims of the application.
Claims (10)
1. a kind of method improving polymer polymer flooding effect, methods described include poly- drive during by nucleocapsid microgel be polymerized
Thing presses the volume ratio injection of 1:100～1:1, and described nucleocapsid microgel is by water solublity neutral monomer acrylamide and ion list
Body i and cross-linking agent copolymer group nucleation portion, wherein acrylamide monomer are 1:20～30:1 with the mass ratio of ion monomer i,
Cross-linked dosage is 0.0001～15wt% of nuclear monomer gross mass；By water solublity neutral monomer acrylamide and ion monomer ii and
Cross-linking agent copolymer constitutes shell parts, and wherein acrylamide monomer and the mass ratio of ion monomer ii are 1:20～30:1, crosslinked
Dosage is 0.0001～15wt% of shell monomer gross mass；Ion monomer i and ion monomer ii has opposite charges；
Described ion monomer i is selected from beta-amido ethylacrylic acid hydrochlorate, beta-amido ethylacrylic acid sulfate, methacryl
Oxy-ethyl-trimethyl salmiac, n, n- dimethylamino ethyl acrylic acid hydrochloride, n, n- dimethylamino ethyl acrylic acid sulfate,
Beta-amido ethyl methacrylate sulfate, allyl amine salt, allyl alkyl salt, (methyl) acrylate quaternary amine, methyl
At least one in the group that acryloxyethyldimethyl butylammonium bromide is formed；
Described ion monomer ii be selected from acrylic acid or acrylates, methacrylic acid or methacrylate, 2- acrylamido-
At least one in the group that 2- methyl propane sulfonic acid salt, alpha-alkene sulfonate, β-allylsulfonate are formed.
2. method according to claim 1, wherein, described nucleocapsid microgel is 1:50～1:2 with the volume ratio of polymer.
3. method according to claim 2, wherein, described nucleocapsid microgel is 1:2 with the volume ratio of polymer.
4. the method according to any one of claim 1-3, wherein, described being injected to alternately is injected or is injected simultaneously into.
5. method according to claim 4, wherein, described being injected to alternately is injected.
6. method according to claim 1, wherein, described polymer is PAMA, anion pp
The modified salt-resistant polymer of amide or the hydrophobic associated polymer of PAMA；Alternatively, described anion poly- third
The hydrophobic associated polymer of acrylamide is ap-p4.
7. method according to claim 1, wherein, the initial particle of described nucleocapsid microgel is 300-1500nm, completely
Some tens of pm is can reach after expansion.
8. a kind of poly- drive compositionss, described compositionss include nucleocapsid microgel and polymer, and described nucleocapsid microgel is by water
Dissolubility neutral monomer acrylamide and ion monomer i and cross-linking agent copolymer group nucleation portion, wherein acrylamide monomer with from
The mass ratio of sub- monomer i is 1:20～30:1, and cross-linked dosage is 0.0001～15wt% of nuclear monomer gross mass；By in water solublity
Property monomeric acrylamide and ion monomer ii and cross-linking agent copolymer constitute shell parts, wherein acrylamide monomer and ion monomer
The mass ratio of ii is 1:20～30:1, and cross-linked dosage is 0.0001～15wt% of shell monomer gross mass；Ion monomer i and ion
Monomer ii has opposite charges；
Described ion monomer i is selected from beta-amido ethylacrylic acid hydrochlorate, beta-amido ethylacrylic acid sulfate, metering system
Acyloxyethyl trimethyl ammonium chloride, n, n- dimethylamino ethyl acrylic acid hydrochloride, n, n- dimethylamino ethyl acrylic acid sulphuric acid
Salt, beta-amido ethyl methacrylate sulfate, allyl amine salt, allyl alkyl salt, (methyl) acrylate quaternary amine, first
At least one in the group that base acryloxyethyldimethyl butylammonium bromide is formed；
Described ion monomer ii is selected from acrylic acid or acrylates, methacrylic acid or methacrylate, 2- acrylamide
At least one in the group that base -2- methyl propane sulfonic acid salt, alpha-alkene sulfonate, β-allylsulfonate are formed.
9. poly- drive compositionss according to claim 8, wherein, described nucleocapsid microgel is 1 with the volume ratio of polymer:
100～1:1.
10. the purposes as oil displacement agent during poly- drive of poly- drive compositionss according to claim 8 or claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610616313.9A CN106350049B (en) | 2016-07-29 | 2016-07-29 | Method for improving polymer flooding effect, polymer flooding composition and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205109A (en) * | 2019-07-10 | 2019-09-06 | 中海石油(中国)有限公司秦皇岛32-6作业公司 | A kind of low-viscosity gel water shutoff agent of resisting high temperature, high salt |
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| CN1940008A (en) * | 2005-09-30 | 2007-04-04 | 中国科学院理化技术研究所 | Deep adjusting water blocking agent of self-crosslinked shell acrylamide multipolymer and its production |
| CN102399345A (en) * | 2010-09-14 | 2012-04-04 | 中国科学院理化技术研究所 | Emulsion deep profile/displacement control agent and preparation method of emulsion deep profile/displacement control agent containing gel microspheres of core shell structure |
| CN103739778A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell polyacrylamide microsphere profile controlling oil displacement agent and preparation method thereof |
| CN103739777A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940008A (en) * | 2005-09-30 | 2007-04-04 | 中国科学院理化技术研究所 | Deep adjusting water blocking agent of self-crosslinked shell acrylamide multipolymer and its production |
| CN102399345A (en) * | 2010-09-14 | 2012-04-04 | 中国科学院理化技术研究所 | Emulsion deep profile/displacement control agent and preparation method of emulsion deep profile/displacement control agent containing gel microspheres of core shell structure |
| CN103739778A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell polyacrylamide microsphere profile controlling oil displacement agent and preparation method thereof |
| CN103739777A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110205109A (en) * | 2019-07-10 | 2019-09-06 | 中海石油(中国)有限公司秦皇岛32-6作业公司 | A kind of low-viscosity gel water shutoff agent of resisting high temperature, high salt |
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