CN101314711A - Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method - Google Patents
Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method Download PDFInfo
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- CN101314711A CN101314711A CNA2008101281473A CN200810128147A CN101314711A CN 101314711 A CN101314711 A CN 101314711A CN A2008101281473 A CNA2008101281473 A CN A2008101281473A CN 200810128147 A CN200810128147 A CN 200810128147A CN 101314711 A CN101314711 A CN 101314711A
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- 238000000034 method Methods 0.000 title claims description 30
- 239000002245 particle Substances 0.000 title claims description 19
- 238000006073 displacement reaction Methods 0.000 title abstract description 35
- 239000008187 granular material Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229920001002 functional polymer Polymers 0.000 claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000006260 foam Substances 0.000 claims abstract description 13
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229940077388 benzenesulfonate Drugs 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- -1 sodium alkyl benzene Chemical class 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 30
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000011549 displacement method Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 49
- 239000010779 crude oil Substances 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 239000012530 fluid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 241000237858 Gastropoda Species 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000011206 ternary composite Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920000891 common polymer Polymers 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention discloses an elastic granule profile control and displacement agent used for petroleum exploitation, which is a dispersion system prepared from 1,500mg/L functional polymer solution and elastic granules by mixing in water, wherein the elastic granules have a concentration of 0.05 to 3wt percent. The invention further discloses an oil displacement system formed by using the foam profile control and displacement agent and an oil displacement method. The oil displacement is achieved by using a combined slug consisting of functional polymers from high viscosity to low viscosity and the elastic grains, and is suitable for multiple kinds of anisotropic oil layers to effectively improve oil recovery, reduce ineffective water circulation, and improve economic benefits. Through the effective combination, the system can improve the recovery greatly, improve the total recovery to 90 percent or above and reduce the oil recovery cost greatly, and can be widely used for tertiary oil recovery.
Description
Technical field:
The present invention relates to the oil recovery technique field, be specifically related in tertiary oil recovery, improve the chemical displacement of reservoir oil system and the corresponding flooding method of oil recovery factor.
Background technology:
Underground crude oil production mainly is a primary oil recovery, crude oil is driven to ground surface and extraction from subsurface deposit, since after the consumption of natural energy, primary oil recovery in the oil reservoir more crude oil provide crude oil from the underground required pressure in the face of land that is driven to by the secondary oil recovery extraction by water filling.Be subjected to oil reservoir sedimentary environment and condition effect, oil reservoir in the plane and the permeability distribution heterogeneity vertically, for example the Daqing oil field longtitudinal dispersion rate variation coefficient mostly is about 0.65.In the waterflooding process, inject the water major part and enter the high permeability zones territory, washed away by long-term injecting water, nonuniformity is even more serious, and the invalid circulation of injection water is serious.Traditional water drive can only be exploited out about 40% of underground crude oil, and big portion crude oil is trapped in the underground exploitation that awaits, and must improve oil recovery factor with the tertiary oil recovery method, and tertiary oil recovery can be implemented with different methods, as thermal methods, fire flooding process, CO
2Drive and chemical flooding, wherein thermal methods, fire flooding process, CO
2It is little traditional further improved potentiality of method such as to drive.The method that adopts chemical flooding to improve recovery ratio has become the target of people's research, and polymer flooding has successively been carried out in the oil field, the ternary chemical flooding, and foam flooding, poly-driving+displacement of reservoir oil modes such as deep profile controlling received the reasonable effect of taping the latent power, but oil displacement efficiency are still not high enough.The polymer flooding recovery ratio can improve about 10% on the basis of water drive, and ternary composite driving can improve about 20% on the basis of water drive, and foam composite flooding improves about 30% in recovery ratio on the basis of water drive.All there is deficiency in several method, and polymer flooding improves recovery ratio insufficient amplitude height because of the interfacial tension that can not reduce significantly between crude oil/water.Though ternary composite driving can reduce interfacial tension significantly, because the adding of alkali has greatly weakened viscoelasticity, the especially polymer elasticity of polymkeric substance, in addition, alkali causes fouling and emulsification of crude oil, influences the oil well ordinary production, and has channeling etc. easily takes place foam flooding.And all there is a large amount of non available water circulating phenomenons in several method.
Summary of the invention:
The object of the present invention is to provide a kind of flooding system and flooding method that can adapt to the heterogeneous oil reservoir of multiple class, can effectively improve oil recovery factor, reduce the non available water circulation, increase economic efficiency.
The present invention has at first adopted a kind of functional polymer in this flooding system.
Functional polymer has following structure:
Wherein: X is-CH
2-(CH
2)
n-CH
3,
Y is
N is less than 20 integer greater than 0.
Functional polymer is the polyacrylamide copolymer of a series of grafting, block, and this functional polymer had both had the visco-elasticity of polymkeric substance can regulate the viscosity that injects liquid, also has the effect (being called as high molecular form agent alive) of tensio-active agent simultaneously.In displacement of reservoir oil technology, functional polymer both can be used as amendment, also can be used as foamy whipping agent, suds-stabilizing agent.
The present invention mainly provides by the granuloplastic elastic granule adjusting driving agnet of this functional polymer combined elastic in this flooding system, as in the displacement of reservoir oil the high permeability formation amendment.Particulate matter is the method that has for a long time as amendment, that the present invention adopts is deformable, and (referring to can be by the hole less than self size, recovering self shape by the back) elastic granule is used for profile control, like this, particle is not to block macropore, but hinder fluid flowing in macropore, and make fluid in interlayer/layer, flow to the low oil reservoir of seepage resistance, enlarge the fluid swept volume.And the functional polymer fluid of different concns and elastic granule combination profile control also have the washing oil effect because functional polymer has surfactivity again when enlarging swept volume.
Flooding system of the present invention comprises the polymer elasticity particle slug of being made up of to the low viscosity functional polymkeric substance and the elastic granule of different sizes high viscosity.
Wherein can comprise the following slug that injects successively: the 0.08PV functional polymer adds elastic granule (viscosity 2400mPa.s, granular size 150 orders, granule density 500mg/L), the 0.1PV polymkeric substance adds elastic granule (viscosity 1500mPa.s, granular size 200 orders, granule density 500mg/L);
Above slug can also be further and 0.2PV foam slug (polymers soln that contains whipping agent, viscosity 7.8mPa.s; Vapour-liquid ratio 0.4: 1) forms a combined slug.
The method of utilizing this flooding system to carry out the displacement of reservoir oil is: in earlier stage behind the water drive 2PV, annotate the 0.08PV polymkeric substance and add elastic granule (viscosity 2400mPa.s, elastic granule size 150 orders, elasticity concentration 500mg/L)+the 0.1PV polymkeric substance adds elastic granule (viscosity 1500mPa.s, granular size 200 orders, elasticity concentration 500mg/L)+0.2PV contains polymers soln (viscosity 7.8mPa.s, the vapour-liquid ratio 0.4: 1 of whipping agent; ); Follow-up water drive 2PV.
The present invention can also circulate and inject a plurality of combined slugs in oil displacement process, and each sub-slug flow driving medium injection rate ratio determines that according to each section core intersection the combined slug number is 2-4.
The present invention is based on the heterogeneous characteristics of oil reservoir, forms efficient chemical flooding system with function combination of polymers elastic granule, has improved displacement efficiency when increasing sweep efficiency, thereby has increased substantially oil recovery factor.
Description of drawings:
Fig. 1 is the dynamic displacement of reservoir oil curve according to the embodiment of the invention one heterogeneous body core.
Fig. 2 is the dynamic displacement of reservoir oil curve according to the embodiment of the invention two heterogeneous body cores.
Embodiment:
The present invention mainly solves the low and non available water round-robin problem of tertiary oil recovery recovery ratio.Design philosophy of the present invention is: by selecting a class functional polymer, with it is that starting point is carried out profile control in conjunction with other method, create brand-new flooding system, no matter make is that homogeneous pay or non-homogeneous pay (only just be we can say homogeneous pay in very low range, and be comparatively speaking), each group slug all has the two or more functions of stifled transfer drive in washing in the oil displacement process, and swept volume and displacement efficiency are improved simultaneously, thus the raising recovery ratio.
Use among the present invention the polymkeric substance of adjusting viscosity be functional polymer, it is polyacrylamide deutero-block, graft copolymer.Particularly, functional polymer has following structure:
Wherein: X is-CH
2-(CH
2)
n-CH
3,
Y is
N is less than 20 integer greater than 0.
This functional polymer, the visco-elasticity that had both had polymkeric substance can be regulated the viscosity that injects liquid, also has the effect (being called as high molecular form agent alive) of tensio-active agent simultaneously.In displacement of reservoir oil technology, functional polymer both can be used as amendment, can be used as detergent again, also can be used as foamy whipping agent, suds-stabilizing agent.Select the functional polymer of tackifying ability among the present invention greater than 40mPa.s, can select the commercial rich functional polymer of buying of producing in sea, Shanghai (available from the functional polymer I of Shanghai Hai Bo company type, viscosity is greater than 100mPa.s or functional polymer III type, and viscosity is greater than 50mPa.s) etc. series.
Other profile control method of bonded of the present invention is the elastic granule profile control.Particulate matter is to utilize its deformable characteristics, like this as amendment, elastic granule is not to block macropore during by rock core in oil displacement process, but hinder fluid flowing in macropore, and make fluid in interlayer/layer, flow to the low oil reservoir of seepage resistance, enlarge the fluid swept volume.Functional polymer combined elastic particle forms the elastic granule adjusting driving agnet, needs to come telomerized polymer fluidic viscosity according to the difference of reservoir permeability distortion particulate size and concentration.Among the present invention, available elastic granule kind comprises: volume expansion grain, and rubber grain, flexible particle etc., and particle adds mass concentration at 0.05wt%～3wt% in functional polymer solution; Be preferably in 0.1wt～0.2wt%.
Among the present invention, utilizing adjusting driving agnet to obtain to increase substantially the displacement of reservoir oil slug that swept volume can increase substantially displacement efficiency again is the dreamboat that the present invention prepares flooding system.At first to obtain reservoir permeability numerical value, utilize the multifunctionality of functional polymer, select suitable composition to form the slug of different viscositys, inject oil reservoir (being called a combined slug) by high viscosity to low viscosity order.Used water at interval between combined slug.Several combined slugs form a plurality of three-dimensional plunger walls at earth formation deep.Under certain condition, different slugs can be similar to parallel moving in the wall, thereby form complete relatively piston displacement mode, force injection water to enter more micro pores, improve and inject oil-water displacement efficiency.
Among the present invention, the slug of different viscosity is sub-slug, injects oil reservoir by high viscosity to low viscosity order and forms a combined slug.The present invention can also circulate and inject a plurality of combined slugs, and each sub-slug flow driving medium injection rate ratio determines that according to each section core intersection the combined slug number is 2-4;
Ratio: (Q
1/ H
1): (Q
2/ H
2): ...: (Q
n/ H
n)=1: 2: ...: n
Wherein: Q
i(i=1 ... n) be rate of permeation each section injection rate from high to low,
H
i(i=1 ... n) be rate of permeation each section thickness from high to low,
Q＝Q
1+Q
2+…+Q
n
Below in conjunction with drawings and Examples the present invention is described in further detail.Should be appreciated that embodiment only makes those skilled in the art's easy to understand and grasp for disclosing particular content of the present invention, can not be as limitation of the present invention.The description of other parts of the present invention and summary also are interpreted as other mode that can specifically implement that can carry out with reference to specific embodiment, can be listed in the embodiment name because of it and ignore its effect that specifies to technical scheme now.
The preparation of embodiment one, elastic granule adjusting driving agnet
Material:
Polymkeric substance 1: Shanghai Hai Bo company, functional polymer I type, viscosity is greater than 100mPa.s;
Polymkeric substance 2: Shanghai Hai Bo company, functional polymer III type, viscosity is greater than 50mPa.s;
Elastic granule 1: Kaifeng Order Science and Technology Ltd., AD22-104 volume expansion grain, 100-200 order;
Elastic granule 2: Jiang Hua, Yongfeng junked tire that borders on the sea is pulverized factory, rubber grain, 0-80 order;
Elastic granule 3: flexible particle, petroleum exploration and development research institute, tensile strength 28.44kPa, granularity is adjustable.
Preparation:
Adjusting driving agnet one: get 1500mg polymkeric substance 1 and add 1L water wiring solution-forming, add the elastic granule 1 of 150 orders (particle diameter) 0.5g again, obtaining the elastic granule mass concentration after the mixing is the polymkeric substance 1-volume expansion grain adjusting driving agnet dispersion system of 0.05wt%.
Adjusting driving agnet two: get 1500mg polymkeric substance 2 and add 1L water wiring solution-forming, add the elastic granule 2 of 80 orders (particle diameter) 2g again, obtain elastic granule addition (mass concentration) after the mixing and be the polymkeric substance 2-rubber grain adjusting driving agnet dispersion system of 0.2wt%;
Adjusting driving agnet three: get 1500mg polymkeric substance 1 and add 1L water wiring solution-forming, add the elastic granule 1 of 120 orders (particle diameter) 30g again, obtaining the elastic granule addition after the mixing is 3wt% polymkeric substance 1-volume expansion grain adjusting driving agnet dispersion system;
Adjusting driving agnet four: get 1500mg polymkeric substance 2 and add 1L water wiring solution-forming, add the elastic granule 3 of 120 orders (particle diameter) 1g again, obtaining the elastic granule addition after the mixing is the flexible particulate adjusting driving agnet of 0.1wt% polymkeric substance 2-dispersion system.
More than Pei Zhi adjusting driving agnet is used for follow-up oil displacement experiment (referring to embodiment two and three).The result shows that the rubber grain particle diameter is at 0-80, and the volume expansion grain particle diameter is when 100-200 order scope, and the adjusting driving agnet of elastic granule concentration in 0.05～3wt% scope is all effective, and preferably concentration ratio is 0.1～0.2wt%.
The oil displacement experiment of embodiment two, heterogeneous body core polymkeric substance-elastic granule flooding system
The experiment of employing indoor physical simulation.
Experiment condition:
Heterogeneous body core: 4.5 * 4.5 * 30cm, three layers of perm-plug method are respectively 100md, 1000md, 3000md.
Oil: Simulation of Crude Oil, viscosity is 10mPas down at 45 ℃;
Water: oilfield sewage;
Adjusting driving agnet: press embodiment one preparation;
Experimental temperature: 45 ℃;
Functional polymer among polymkeric substance: the embodiment one.
Experimental technique:
In earlier stage behind the water drive 2PV, annotate I type functional polymer (viscosity 1500mPa.s)+0.01PV adjusting driving agnet two (viscosity 560mPa.s)+0.15PV, the 1000ppm III type functional polymer (51mPa.s) (injection two-wheeled)+0.3PV foam (the III type functional polymer of 0.3% whipping agent-sodium alkyl benzene sulfonate+500mg/L) of 0.07PV, 1500mg/L, follow-up water drive 2PV.
Displacement of reservoir oil result: referring to Fig. 1.Show that overall recovery factor reaches about 72%, on the water drive basis, improve more than 39%.Can also see at injection oil-displacing agent process pressure that by Fig. 1 rising is all arranged; Follow-up water drive pressure obviously reduces.
Identical with method with embodiment two above-mentioned experiment conditions, what wherein change is to use adjusting driving agnet one, three and four; Displacement of reservoir oil result shows that functions of use polymkeric substance-elastic granule displacement of reservoir oil can improve recovery ratio all more than 35% on the water drive basis, and overall recovery factor also reaches more than 70%.Compare with common polymer flooding (about recovery ratio 10%), ternary composite driving (about recovery ratio 20%), foam composite flooding (about recovery ratio 30%), oil displacement efficiency obviously improves.
The oil displacement experiment of embodiment three, polymkeric substance-elastic granule-foaming flooding system
The experiment of employing indoor physical simulation.
Experiment condition:
Heterogeneous body core: 4.5 * 4.5 * 30cm, three layers of perm-plug method are respectively 100md, 1000md, 3000md.
Oil: Simulation of Crude Oil, viscosity is 10mPas down at 45 ℃;
Water: sewage;
Functional polymer and elastic granule among chemical agent: the embodiment one, the whipping agent sodium alkyl benzene sulfonate;
Experimental temperature: 45 ℃;
Foam: expanding foam solution and compressed-air actuated volume ratio are 0.4: 1;
Experimental technique:
More than the water drive water ratio to 98%, in earlier stage behind the water drive 2PV; Annotate one group of combined slug, be followed successively by: 0.08PV polymkeric substance 1 adds volume expansion grain (polymkeric substance viscosity 2400mPa.s, volume expansion grain size 150 orders, concentration 0.5wt%), 0.1PV polymkeric substance 1 adds volume expansion grain (polymkeric substance viscosity 1500mPa.s, volume expansion grain size 200 orders, concentration 0.5wt%), 0.2PV polymkeric substance 1 adds sodium alkyl benzene sulfonate foam profile agent (vapour-liquid ratio 0.4: 1; Polymkeric substance viscosity 7.8mPa.s, density of foaming agent 0.1wt%); Follow-up water drive 2PV.
Displacement of reservoir oil result: referring to Fig. 2.Show overall recovery factor about 90%, on the water drive basis, improve more than 48%.Can also see at injection oil-displacing agent process pressure that by Fig. 2 rising is all arranged; Follow-up water drive pressure obviously reduces, but is higher than preceding water drive.
Embodiment three can show, the functional polymer elastic granule drives and can also the combination function foam of polymers drives and form the combined slug displacement of reservoir oil, compares with common polymer flooding, ternary composite driving, foam composite flooding, and the oil displacement efficiency increase rate is bigger.
Claims (10)
1, a kind of elastic granule adjusting driving agnet is used for oil production, it is characterized in that, mix the formulated dispersion system in back with elastic granule by the 1500mg/L functional polymer aqueous solution, and the elasticity granule density is 0.05～3wt% in the adjusting driving agnet.
2, according to the described elastic granule adjusting driving agnet of claim 1, it is characterized in that described elastic granule is for being selected from volume expansion grain, rubber grain, the combination of one or more in the flexible particle, wherein the rubber grain particle diameter is at the 0-80 order, and the volume expansion grain particle diameter is in 100-200 order scope.
3, according to claim 1 or 2 described elastic granule adjusting driving agnets, it is characterized in that, described functional polymer, the polymkeric substance that selects free style one to represent:
Wherein: X is-CH
2-(CH
2)
n-CH
3,
Y is
4, according to claim 1 or 2 described elastic granule adjusting driving agnets, it is characterized in that wherein the elastic granule optimum concentration range is 0.1～0.2wt%.
5, a kind of flooding system comprises the combined slug of being made up of high viscosity to low viscosity functional polymkeric substance and elastic granule.
6, according to the described flooding system of claim 5, it is characterized in that, described combined slug comprises the following sub-slug that injects successively: the functional polymer of 0.07PV, 1500mg/L (viscosity 1500mPa.s), 0.01PV polymkeric substance adds elastic granule (viscosity 560mPa.s, granular size 80 orders, granule density 0.2wt%), 0.15PV functional polymer (viscosity 51mPa.s, 1000ppm) (injection two-wheeled), 0.3PV foam (0.3% sodium alkyl benzene sulfonate whipping agent adds the functional polymer of 500mg/L).
7, according to the described flooding system of claim 5, it is characterized in that, described combined slug comprises the following sub-slug that injects successively: the 0.08PV polymkeric substance adds elastic granule (viscosity 2400mPa.s, granular size 100-200 order, concentration 1000-2500mg/L), the 0.1PV polymkeric substance adds elastic granule (viscosity 1500mPa.s, granular size 100-200 order, concentration 1000-2500mg/L); And the 0.2PV polymkeric substance adds whipping agent (liquid-gas ratio is than 0.4: 1, polymkeric substance viscosity 7.8mPa.s).
8, according to claim 6 or 7 described flooding systems, it is characterized in that described elastic granule is for being selected from volume expansion grain, rubber grain, the combination of one or more in the flexible particle, wherein the rubber grain particle diameter is at the 0-80 order, and the volume expansion grain particle diameter is in 100-200 order scope.
9, behind a kind of flooding method, early stage water drive 2PV, inject as claim 5 to 8 arbitrary as described in the combination flooding system, follow-up again water drive 2PV.
According to the described flooding method of claim 9, it is characterized in that 10, in the described flooding system, according to each section core intersection, it is 2～4 that combined slug injects number.
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| CN200810128147.3A CN101314711B (en) | 2008-07-18 | 2008-07-18 | Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method |
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| CN200810128147.3A CN101314711B (en) | 2008-07-18 | 2008-07-18 | Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method |
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| CN101885961A (en) * | 2010-06-30 | 2010-11-17 | 梁开方 | Water plugging profile control agent |
| CN102242625A (en) * | 2011-04-25 | 2011-11-16 | 中国石油化工股份有限公司 | Method for improving recovery ratio of crude oil of oil deposit after polymer flooding |
| CN103216211A (en) * | 2012-01-18 | 2013-07-24 | 中国石油天然气股份有限公司 | Method for carrying out profile control on fracture-type oil reservoir |
| CN103410486A (en) * | 2013-08-06 | 2013-11-27 | 西安石油大学 | Three-in-one composite profile control and displacement process used for oilfield deep profile control |
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| CN101086210A (en) * | 2007-07-13 | 2007-12-12 | 辽河石油勘探局 | Profile control and water plugging technology for coal bed gas |
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| CN102242625A (en) * | 2011-04-25 | 2011-11-16 | 中国石油化工股份有限公司 | Method for improving recovery ratio of crude oil of oil deposit after polymer flooding |
| CN102242625B (en) * | 2011-04-25 | 2012-12-26 | 中国石油化工股份有限公司 | Method for improving recovery ratio of crude oil of oil deposit after polymer flooding |
| CN103216211B (en) * | 2012-01-18 | 2015-09-23 | 中国石油天然气股份有限公司 | A kind of Fractured reservoir profile control method |
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| CN103539946B (en) * | 2012-07-12 | 2016-06-08 | 中国石油化工股份有限公司 | Hydrophobic polymer graft modification acrylamide polymer and preparation method thereof |
| CN103539946A (en) * | 2012-07-12 | 2014-01-29 | 中国石油化工股份有限公司 | Hydrophobic polymer graft modified acrylamide polymer and preparation method thereof |
| CN103410486B (en) * | 2013-08-06 | 2015-10-28 | 西安石油大学 | A kind of three-in-one compound displacement technique for oil field deep transfer drive |
| CN103410486A (en) * | 2013-08-06 | 2013-11-27 | 西安石油大学 | Three-in-one composite profile control and displacement process used for oilfield deep profile control |
| CN104910882A (en) * | 2015-04-09 | 2015-09-16 | 中国石油天然气股份有限公司 | Flexible gel particle and flexible gel particle plugging agent prepared from the same |
| CN105038756A (en) * | 2015-07-08 | 2015-11-11 | 中国石油大学(华东) | Carbon dioxide foam system added with hydrophilic nanoparticles for oil displacement and preparation method for carbon dioxide foam system |
| CN111611670A (en) * | 2019-02-25 | 2020-09-01 | 中国石油天然气股份有限公司 | Method, equipment and system for multi-section plug combined type deep profile control and flooding |
| CN111611670B (en) * | 2019-02-25 | 2022-11-04 | 中国石油天然气股份有限公司 | Method, equipment and system for multi-section plug combined type deep profile control and drive |
| WO2020248309A1 (en) * | 2019-06-14 | 2020-12-17 | 西南石油大学 | Mine application method for increasing crude oil recovery rate by nano-micropheres in situ |
| US11118102B2 (en) | 2019-06-14 | 2021-09-14 | Southwest Petroleum University | Mine application method for in-situ nano-microspheres to increase crude oil recovery rate |
| CN115075789A (en) * | 2022-07-19 | 2022-09-20 | 中海石油(中国)有限公司 | Method for improving recovery ratio of strong heterogeneous oil field by discontinuous chemical flooding |
| CN115075789B (en) * | 2022-07-19 | 2024-03-01 | 中海石油(中国)有限公司 | Method for improving recovery ratio of discontinuous chemical flooding of strong heterogeneous oil field |
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