CN104974732A - Microsphere oil displacement agent used for improving recovery efficiency - Google Patents
Microsphere oil displacement agent used for improving recovery efficiency Download PDFInfo
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- CN104974732A CN104974732A CN201510237124.6A CN201510237124A CN104974732A CN 104974732 A CN104974732 A CN 104974732A CN 201510237124 A CN201510237124 A CN 201510237124A CN 104974732 A CN104974732 A CN 104974732A
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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
- C09K8/588—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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- 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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Abstract
The invention discloses a microsphere oil displacement agent used for improving recovery efficiency. According to the invention, the participations of an acrylamide crystal, N,N'-methylene bisacrylamide, styrene and potassium persulfate enable gel ductility of polymer gel microspheres to reach the maximum; meanwhile, good characteristics of temperature resistance and mineralization resistance and enormous quantitative characteristic are obtained, and online injection can be realized; pore-scale polymer microspheres can be migrated in the core and has high a resistance coefficient and a residual resistance coefficient; the resistance coefficient of a compound system of microspheres and a polymer solution in the core is much higher than the resistance coefficient of a pure polymer solution system in the core, and synergistic effects and higher abilities of increasing the swept volume and preventing the polymer solution from flowing in a highly-penetrable pore channel are obtained; and the pore-scale polymer microspheres have good adaptability to nonhomogeneity of an oil layer, so that the injection water swept volume can be significantly expanded; water content of an oil well is reduced; and crude oil output is increased.
Description
Technical field
The present invention relates to oil field oil-displacing agent technical field, be specifically related to improve recovery ratio microballoon oil-displacing agent.
Background technology
Oil recovery rate affects by the swept volume and displacement efficiency injecting fluid.For China oil field, straticulate exploration is many, and serious heterogeneity in interlayer and layer, enters High water cut and ultra-high water-containing after date, and inject fluid sweep efficiency little, recovery ratio is low.Change injection water flow direction, improve and inject the important method that water swept volume is raising recovery ratio.
Summary of the invention
Object of the present invention is exactly the defect existed for prior art, a kind of can change is provided to inject water flow direction, raising injection water swept volume, match with pore scale, recoverable deformation can be there is, can be continued to deep migration by venturi, realize the raising recovery ratio oil-displacing agent of omnidistance profile adjustment and oil displacement.
Its technical scheme is: improve recovery ratio microballoon oil-displacing agent, comprise the raw material of following weight part:
Deionized water 50-300 gram of acrylamide crystal 8-20 gram
Vinylbenzene 1-5 gram of linking agent 0.1-2 gram
Ammonium persulphate 0.1-2 gram of Potassium Persulphate 0.1-0.8 gram
Oil 100-260 gram of span-80 1-10 gram
Tween-80 0.5-10 gram.
Described oil is mineral oil, white oil or vegetables oil.
Described linking agent is N, N
/-methylene-bisacrylamide.
Improve the recovery ratio preparation method of microballoon oil-displacing agent, comprise the following steps:
1) oil phase is prepared:
In a little still, add oil, open and stir, then span-80 and tween-80 are put into reactor, stir, heat to the material in reactor, constant temperature half an hour;
2) aqueous phase is prepared:
Acrylamide crystal, linking agent, ammonium persulphate are added in ready deionized water, stirs;
3) potassium persulfate solution is prepared:
With deionized water, Potassium Persulphate is dissolved formation potassium persulfate solution;
4) at about 35 DEG C, ready vinylbenzene is added drop-wise in the oil phase of reactor, and then in solvent potassium persulfate solution instillation reactor, finally ready aqueous phase is added in reactor, dropwise rear temperature and slowly rise to 75 DEG C, isothermal reaction 2 hours, Temperature fall, forms microballoon.
After heating when preparing oil phase, thermostat temperature is 30 DEG C.
Stir in reactor in the process of the reaction heated up at oil phase and aqueous phase always.
The present invention compared with prior art, has the following advantages: the present invention's micro-material synthetic method has synthesized the polymer gel microsphere mated with oil reservoir pore scale.This polymer gel microsphere is by acrylamide crystal, N, N
/the participation of-methylene-bisacrylamide, vinylbenzene and Potassium Persulphate, makes the gel ductility of polymer gel microsphere reach ultimate attainment, and has good temperature tolerance and resistance to salinity characteristic, and has huge quantative attribute, can realize online injection; Pore scale polymer microballoon can be migrated in rock core, and has very high resistance coefficient and residual resistance factor; Microballoon and the resistance coefficient of polymers soln compound system in rock core, far above straight polymer solution system, have and add effect effect, the ability having higher raising swept volume and stop polymers soln to be fled in high seepage hole road; The nonuniformity of pore scale polymer microballoon to oil reservoir has good adaptability, significantly can expand and inject water swept volume, reduces water ratio in oil well, increases crude production rate.
Embodiment
Embodiment one:
Improve recovery ratio microballoon oil-displacing agent, comprise the raw material of following weight part:
Deionized water 100 grams of acrylamide crystals 13.3 grams
Vinylbenzene 2.3 grams of linking agents 0.3 gram
Ammonium persulphate 0.7 gram of Potassium Persulphate 0.2 gram
Oil 160 grams of span-80 6.4 grams
Tween-80 1.6 grams.
Described oil is mineral oil, white oil or vegetables oil.
Described linking agent is N, N
/-methylene-bisacrylamide.
Improve the recovery ratio preparation method of microballoon oil-displacing agent, comprise the following steps:
1) oil phase is prepared:
In a little still, add oil, open and stir, then span-80 and tween-80 are put into reactor, stir, heat to the material in reactor, constant temperature half an hour;
2) aqueous phase is prepared:
Acrylamide crystal, linking agent, ammonium persulphate are added in ready deionized water, stirs;
3) potassium persulfate solution is prepared:
With deionized water, Potassium Persulphate is dissolved formation potassium persulfate solution;
4) at about 35 DEG C, ready vinylbenzene is added drop-wise in the oil phase of reactor, and then in solvent potassium persulfate solution instillation reactor, finally ready aqueous phase is added in reactor, dropwise rear temperature and slowly rise to 75 DEG C, isothermal reaction 2 hours, Temperature fall, forms microballoon.
After heating when preparing oil phase, thermostat temperature is 30 DEG C.
Stir in reactor in the process of the reaction heated up at oil phase and aqueous phase always.
Wherein, acrylamide crystal is a kind of water-soluble polymers, N, N
/methylene-bis (acrylamide) is a kind of linking agent, crosslinked effect is played to the polymkeric substance of acrylamide crystal, promoter when ammonium persulphate is acrylamide crystal polymerization, Potassium Persulphate be vinylbenzene gather with time promotor, span-80 and tween-80 are all emulsifying agents, play the effect of emulsified crude oil, dispersion.By this different materials composite reaction, can synthesize and mate the good polymer gel microsphere of gel ductility with its pore scale.
Dispersion medium is heated to temperature of reaction by the present invention in the reactor.Again that polymkeric substance, polyreaction agent, catalyzer, one-tenth globule and other auxiliary agents is soluble in water respectively, and by synthesis microballoon pore scale design requirements, be dispersed in dispersion medium and carried out polyreaction.After having reacted, microballoon is generated to reaction and carries out precipitate and separate, obtain pore scale polymer gel microsphere.
Embodiment two:
Improve recovery ratio microballoon oil-displacing agent, comprise the raw material of following weight part:
Deionized water 50 grams of acrylamide crystals 8 grams
Vinylbenzene 1 gram of linking agent 0.1 gram
Ammonium persulphate 0.1 gram of Potassium Persulphate 0.1 gram
Oil 100 grams of span-80 1 gram
Tween-80 0.5 gram.
Described oil is mineral oil, white oil or vegetables oil.
Described linking agent is N, N
/-methylene-bisacrylamide.
Improve the recovery ratio preparation method of microballoon oil-displacing agent, comprise the following steps:
1) oil phase is prepared:
In a little still, add oil, open and stir, then span-80 and tween-80 are put into reactor, stir, heat to the material in reactor, constant temperature half an hour;
2) aqueous phase is prepared:
Acrylamide crystal, linking agent, ammonium persulphate are added in ready deionized water, stirs;
3) potassium persulfate solution is prepared:
With deionized water, Potassium Persulphate is dissolved formation potassium persulfate solution;
4) at about 35 DEG C, ready vinylbenzene is added drop-wise in the oil phase of reactor, and then in solvent potassium persulfate solution instillation reactor, finally ready aqueous phase is added in reactor, dropwise rear temperature and slowly rise to 75 DEG C, isothermal reaction 2 hours, Temperature fall, forms microballoon.
After heating when preparing oil phase, thermostat temperature is 30 DEG C.
Stir in reactor in the process of the reaction heated up at oil phase and aqueous phase always.
Embodiment three:
Improve recovery ratio microballoon oil-displacing agent, comprise the raw material of following weight part:
Deionized water 200 grams of acrylamide crystals 15 grams
Vinylbenzene 5 grams of linking agents 0.9 gram
Ammonium persulphate 2 grams of Potassium Persulphates 0.5 gram
Oil 260 grams of span-80 5 grams
Tween-80 2 grams.
Described oil is mineral oil, white oil or vegetables oil.
Described linking agent is N, N
/-methylene-bisacrylamide.
Improve the recovery ratio preparation method of microballoon oil-displacing agent, comprise the following steps:
1) oil phase is prepared:
In a little still, add oil, open and stir, then span-80 and tween-80 are put into reactor, stir, heat to the material in reactor, constant temperature half an hour;
2) aqueous phase is prepared:
Acrylamide crystal, linking agent, ammonium persulphate are added in ready deionized water, stirs;
3) potassium persulfate solution is prepared:
With deionized water, Potassium Persulphate is dissolved formation potassium persulfate solution;
4) at about 35 DEG C, ready vinylbenzene is added drop-wise in the oil phase of reactor, and then in solvent potassium persulfate solution instillation reactor, finally ready aqueous phase is added in reactor, dropwise rear temperature and slowly rise to 75 DEG C, isothermal reaction 2 hours, Temperature fall, forms microballoon.
After heating when preparing oil phase, thermostat temperature is 30 DEG C.
Stir in reactor in the process of the reaction heated up at oil phase and aqueous phase always.
The microballoon experimental data that in rock core, transfer drive is tested after poly-driving is as follows:
Microballoon transfer drive and enhancing oil recovery in polymer flooding contrast experiment data as follows:
Pore scale elastic microsphere transfer drive experimental data is as follows:
It can thus be appreciated that microballoon transfer drive has higher raising recovery ratio ability than polymer flooding.
Experiment proves, reservoir rocks has submicron order pore throat yardstick, synthesizes the polymer gel microsphere mated with its pore scale.When the microballoon of substantial amounts injects oil reservoir with water, single microballoon freely can be migrated in oil reservoir porous medium, and at venturi, place produces resistance to current, changes its flow direction: can produce shutoff when multiple microballoon is piled up at venturi place simultaneously, water is streamed completely.Gel micro-ball has elasticity, when pressure difference of blocking is elevated to a certain degree, recoverable deformation can occur, and is continued to deep migration, realize omnidistance profile adjustment and oil displacement by venturi.The synthetic method of research pore scale polymer gel microsphere and essential property, migration behavior and resistance factor, significant to the profile adjustment and oil displacement method setting up new pore scale elastic microsphere.
Synthetic materials of the present invention is mainly polymkeric substance, dispersion medium, polyreaction agent, catalyzer, one-tenth globule and other auxiliary agents.The present invention's micro-material synthetic method has successfully synthesized the polymer gel microsphere mated with oil reservoir pore scale.This polymer gel microsphere is by acrylamide crystal, N, N
/the participation of-methylene-bisacrylamide, vinylbenzene and Potassium Persulphate, makes the gel ductility of polymer gel microsphere reach ultimate attainment, and has good temperature tolerance and resistance to salinity characteristic, and has huge quantative attribute, can realize online injection.
Pore scale polymer microballoon can be migrated in rock core, and has very high resistance coefficient and residual resistance factor.Microballoon and the resistance coefficient of polymers soln compound system in rock core, far above straight polymer solution system, have and add effect effect, the ability having higher raising swept volume and stop polymers soln to be fled in high seepage hole road.The nonuniformity of pore scale polymer microballoon to oil reservoir has good adaptability, significantly can expand and inject water swept volume, reduces water ratio in oil well, increases crude production rate.
Claims (6)
1. improve recovery ratio microballoon oil-displacing agent, it is characterized in that: the raw material comprising following weight part:
Deionized water 50-300 gram of acrylamide crystal 8-20 gram
Vinylbenzene 1-5 gram of linking agent 0.1-2 gram
Ammonium persulphate 0.1-2 gram of Potassium Persulphate 0.1-0.8 gram
Oil 100-260 gram of span-80 1-10 gram
Tween-80 0.5-10 gram.
2. raising recovery ratio microballoon oil-displacing agent according to claim 1, is characterized in that: described oil is mineral oil, white oil or vegetables oil.
3. raising recovery ratio microballoon oil-displacing agent according to claim 1, is characterized in that: described linking agent is N, N
/-methylene-bisacrylamide.
4. the preparation method of raising recovery ratio microballoon oil-displacing agent according to claim 2, is characterized in that: comprise the following steps:
1) oil phase is prepared:
In a little still, add oil, open and stir, then span-80 and tween-80 are put into reactor, stir, heat to the material in reactor, constant temperature half an hour;
2) aqueous phase is prepared:
Acrylamide crystal, linking agent, ammonium persulphate are added in ready deionized water, stirs;
3) potassium persulfate solution is prepared:
With deionized water, Potassium Persulphate is dissolved formation potassium persulfate solution;
4) at about 35 DEG C, ready vinylbenzene is added drop-wise in the oil phase of reactor, and then in solvent potassium persulfate solution instillation reactor, finally ready aqueous phase is added in reactor, dropwise rear temperature and slowly rise to 75 DEG C, isothermal reaction 2 hours, Temperature fall, forms microballoon.
5. the preparation method of raising recovery ratio microballoon oil-displacing agent according to claim 4, is characterized in that: after heating when preparing oil phase, thermostat temperature is 30 DEG C.
6. the preparation method of raising recovery ratio microballoon oil-displacing agent according to claim 4, is characterized in that: stir in reactor in the process of the reaction heated up at oil phase and aqueous phase always.
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| CN201510237124.6A CN104974732A (en) | 2015-05-12 | 2015-05-12 | Microsphere oil displacement agent used for improving recovery efficiency |
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| CN201510237124.6A CN104974732A (en) | 2015-05-12 | 2015-05-12 | Microsphere oil displacement agent used for improving recovery efficiency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105542088A (en) * | 2015-12-28 | 2016-05-04 | 常州亚环环保科技有限公司 | Method for preparing oil-displacing agent by modified charged polymer microspheres |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086248A (en) * | 2010-12-24 | 2011-06-08 | 北京石大万嘉新材料科技有限公司 | Polyacrylamide microgel as well as preparation method and application thereof |
| 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 |
| CN102504793A (en) * | 2011-10-10 | 2012-06-20 | 西南石油大学 | Core-shell polymer microsphere profile control and oil displacement agent and preparation method thereof |
| CN104448126A (en) * | 2013-09-24 | 2015-03-25 | 中国石油化工股份有限公司 | Harsh oil deposit reversed-phase microemulsion profile-control flooding system and preparation method thereof |
-
2015
- 2015-05-12 CN CN201510237124.6A patent/CN104974732A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102086248A (en) * | 2010-12-24 | 2011-06-08 | 北京石大万嘉新材料科技有限公司 | Polyacrylamide microgel as well as preparation method and application thereof |
| CN102504793A (en) * | 2011-10-10 | 2012-06-20 | 西南石油大学 | Core-shell polymer microsphere profile control and oil displacement agent and preparation method thereof |
| CN104448126A (en) * | 2013-09-24 | 2015-03-25 | 中国石油化工股份有限公司 | Harsh oil deposit reversed-phase microemulsion profile-control flooding system and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105542088A (en) * | 2015-12-28 | 2016-05-04 | 常州亚环环保科技有限公司 | Method for preparing oil-displacing agent by modified charged polymer microspheres |
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Application publication date: 20151014 |