CN109812249A - Oil reservoir oil displacement method - Google Patents
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Abstract
The present invention relates to oil reservoir oil displacement fields, disclose a kind of oil reservoir oil displacement method, wherein; the flooding method includes: to inject preposed attributives A into oil reservoir from injection well, is then injected into gas, and then successively alternately glutinous oil displacement system B and gas drop in injection; it is then injected into protection slug C, is finally filled the water；Wherein, the preposed attributives A is the aqueous solution containing surfactant and/or polymer, and the glutinous oil displacement system B of drop contains surfactant, alcohol, polymer and water；The protection slug C is the aqueous solution containing polymer.The present invention passes through " liquid-gas " alternate injection method of periodic transformation, enhance earth formation deep emulsifier and viscous crude shear action, promote earth formation deep viscous crude to emulsify, strengthens oil displacement system in the emulsification oil cleaning of earth formation deep, significantly improve oil displacement process displacement efficiency and sweep efficiency.
Description
Technical field
The present invention relates to oil reservoir oil displacement methods, are particularly suitable for the oil reservoir oil displacement method of thickened oil recovery process.
Background technique
Viscosity is greater than the crude oil of 50mPa.s under the conditions of viscous crude refers to 50 DEG C.Heavy oil development accounts in the oil and gas development in China
There is certain specific gravity, Liaohe Oil Field, Shengli Oil Field, Xinjiang Oilfield, Zhongyuan Oil Field and Jiangsu oilfield have viscous crude distribution.It is existing
In some heavy oil development technologies based on oil recovery by heating, the viscosity of viscous crude is reduced by heating, improves the mobility of viscous crude, improve
Recovery ratio.The major defect of oil recovery by heating is energy consumption height.Depth, oil reservoir be thin, aqueous high oil reservoir for burying, thermal process heat
Utilization rate is low.In comparison, it during viscous crude " cold to adopt ", is not then limited by above-mentioned condition.
During thickened oil recovery, since viscosity of thickened oil is much higher than the viscosity of water, unfavorable high mobility ratio resulting from makes
Viscous crude waterflooding extraction recovery ratio is lower.Viscous fingering caused by high mobility ratio keeps the sweep efficiency of displacement process lower, to make
At the low recovery ratio of heavy oil development.Improve the mobility of viscous crude, the sweep efficiency expanded in displacement process is thickened oil recovery process
The middle key for improving recovery ratio.The main mobility for improving viscous crude by reducing viscosity by emulsification in the prior art, improves thick oil recovery ratio.
Reducing viscosity by emulsification is using applying surface activating agent by viscous crude and aqueous surfactant solution formation " oil-in-water " type emulsion, thus
Crude viscosity is reduced, a kind of drop sticking method of viscous crude mobility is improved.
CN103320110A discloses a kind of viscous crude and super heavy oil recovery nano composite high temperature resistant adjuvant and its system
Preparation Method.This method includes by modified Nano inorganic assistant, petroleum sulfonate, visbreaking agent, emulsifier, surface active agent, infiltration
Agent, macromolecule modifier, rush agent and catalyst and water are prepared.The modified Nano inorganic assistant is modified Nano
SiO2, visbreaking agent is anionic surfactant and/or nonionic surfactant.The visbreaking agent can be under the high temperature conditions
It is glutinous to carry out viscous crude drop.
CN104650843A discloses a kind of reducing viscosity by emulsification type displacement composition suitable for heavy crude reservoir, with weight percent
It include: anionic polymer 0.1-0.3%, nonionic surface active agent 0.01-0.1%, emulsification at being grouped as than meter
Stabilizer 0.02-0.12%, appropriate inorganic salts and water surplus.Wherein, the anionic polymer includes having in molecule
The anionic polymer of carboxyl, preferably Sodium Polyacrylate.The nonionic surface active agent includes alkyl glycosides, tween
One of 80 and polysorbate85 are a variety of.The emulsion stabilizer includes polyacrylamide.The reducing viscosity by emulsification dosage form oil displacement agent group
Closing object has preferable reducing viscosity by emulsification and oil displacement efficiency to common heavy oil.
CN103422840A discloses a kind of flooding method compound using anions and canons complexed surfactant, application
Recovery ratio is improved in thin oil.Oil displacement agent used contain anionic surfactant, cationic surfactant, polymer and
Water.Wherein, anionic surfactant be selected from petroleum sulfonate, alkylbenzene sulfonate, alkene sulfonate, lignosulfonates,
At least one of petroleum carboxylate and alkyl carboxylate, cationic surfactant select tetra-alkyl ammonium chloride and/or four alkane
Base ammonium hydroxide, polymer use polyacrylamide or xanthan gum.The system can form under the conditions of alkali-free with dilute crude oil super
Low interfacial tension.
CN102287172 A discloses a kind of method of thickened oil recovery.This method, which uses, first injects gel profile-controlling slug, then
Inject the method heavy crude producing of oil displacement agent.This method improves the sweep efficiency of displacement process using shake gels profile control agent, so
After reinject surfactant flooding agent, the technology combined using " 2+3 " improves recovery ratio.
For some common heavy oils, viscosity is less than 10000mPa.s in the earth formation, can flow in the earth formation, Neng Goujin
Row waterflooding extraction, but exploitation effect is poor.As previously mentioned, the principal element for influencing recovery ratio during heavy oil cold flow production is to involve
Efficiency.And the method for the prior art is mainly acted on by reducing viscosity by emulsification, improves recovery ratio by improving the mobility of viscous crude, it is right
It is smaller to improve sweep efficiency influence, therefore the improvement of recovery ratio needs to be further increased.
Summary of the invention
The purpose of the invention is to overcome the problems, such as that recovery ratio of the existing technology is to be improved, a kind of oil reservoir is provided
Flooding method, the flooding method can be improved oil reservoir, can especially improve the displacement process of common heavy oil, content of wax viscous crude simultaneously
In displacement efficiency and sweep efficiency, significantly improve reservoir water drive exploitation effect.
It was found by the inventors of the present invention that emulsified viscous oil drop is glutinous at present in wellbore lift process, the defeated process of viscous crude pipe and individual well
It succeeds during handling up application, but reducing viscosity by emulsification technology is also failed in oil displacement process into industrially scalable application.
Major influence factors are that emulsified viscous oil process cannot spontaneously form, and need to occur under the conditions of certain shearing force；Well
Shear action can satisfy the requirement of emulsification during cylinder and pipe are defeated；And the glutinous displacement of reservoir oil is dropped for emulsified viscous oil and improves recovery ratio skill
Art drops glutinous lifting from thick oil well bore and the glutinous transmission process of viscous crude chemistry drop is different, and emulsified dose of formation condition was migrated on stratum
Shear force far below pit shaft and manages defeated process in journey, and as emulsifier is more next to earth formation deep migration shear force
Lower, causing emulsifier to weaken in earth formation deep emulsification cannot even emulsify, therefore emulsifies oil displacement efficiency and obviously drop
It is low.Additionally due to viscosity of thickened oil is much higher than thin oil, therefore sweep efficiency is far below ligh-oil reservoir, simple emulsification during water drive
The glutinous effect of drop, further decreases the viscosity of displacing phase, sweep efficiency is caused to reduce.
To achieve the goals above, the present invention provides a kind of oil reservoir oil displacement method, wherein the flooding method include: from
Injection well injects preposed attributives A into oil reservoir, is then injected into gas, and then successively alternately glutinous oil displacement system B and gas drop in injection,
It is then injected into protection slug C, is finally filled the water；
Wherein, the preposed attributives A is the aqueous solution containing surfactant and/or polymer, described to drop glutinous displacement of reservoir oil body
It is that B contains surfactant, alcohol, polymer and water；The protection slug C is the aqueous solution containing polymer.
The present invention passes through " liquid-gas " alternate injection method of periodic transformation, shears earth formation deep emulsifier and viscous crude
Effect enhancing, promotes earth formation deep viscous crude to emulsify, and strengthens oil displacement system in the emulsification oil cleaning of earth formation deep；It realizes
For viscous crude under the effect of oil displacement agent system " removing " to " dispersion " " migration ", " Jamin effect " of the crude oil of dispersion increases resistance coefficient
Add, the concurrently injected drop with foam performance sticks oil displacement system and plays adjustment in stratum High water cut region and gas formation foam
The effect of injection profile, while gas can be dissolved in viscous crude further reduced Crude viscosity, improve crude oil fluidity,
Significantly improve oil displacement process displacement efficiency and sweep efficiency.
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
In the present invention, "at least one" indicates one or more kinds of.
According to the present invention, the flooding method includes: to inject preposed attributives A into oil reservoir from injection well, is then injected into gas
Body, then successively alternately glutinous oil displacement system B and gas drop in injection, are then injected into protection slug C, finally fill the water；
Wherein, the preposed attributives A is the aqueous solution containing surfactant and/or polymer, described to drop glutinous displacement of reservoir oil body
It is that B contains surfactant, alcohol, polymer and water；The protection slug C is the aqueous solution containing polymer.
According to the present invention, the preposed attributives A first injected can be adsorbed on core surface and form protective layer, play protection and make
With the loss for the emulsifier being subsequently implanted into can be reduced, while preposed attributives A is capable of forming bubble in the rear gas for continuing injection
Foam plays the role of section adjustment, can make to drop glutinous oil displacement system B and preferably contacts with viscous crude.It can function as described above
Preposed attributives A is surfactant and/or polymer.Usual preposed attributives A is used and is injected in the form of its aqueous solution.
Wherein, the surfactant can be anionic surfactant, nonionic surfactant, cationic surface
One of activating agent is also possible to the mixture of a variety of surfactants therein, anionic surfactant in the present invention,
There are fabulous compatibilities between nonionic surfactant, cationic surfactant, and it is living to can be realized multiple types surface
The compound use of property agent.Specifically, the example that can be realized the surfactant of above-mentioned function includes but is not limited to:
The anionic surfactant can be selected from alkyl phenol polyoxyethylene ether sulfate, alkyl phenol polyoxyethylene ether phosphorus
One of hydrochlorate and alkyl phenol polyoxyethylene ether carboxylate are a variety of；Preferably alkyl phenol polyoxyethylene ether sulfuric acid ester salt.Its
In, the alkyl phenol polyoxyethylene ether sulfate, alkyl phenol polyoxyethylene ether phosphate and alkyl phenol polyoxyethylene ether carboxylate
In alkyl can be each independently the alkyl of C7-C12, the repetitive unit of ethyoxyl can be each independently 5-50.
The nonionic surfactant can be selected from alkyl amine-oxides, alkyl phenol polyoxyethylene ether, alkyl polyoxyethylene
One of ether, alkyl phenol polyoxyethylene ether sulfuric acid ester and alkyl phenol polyoxyethylene ether phosphate ester are a variety of；Preferably alkyl oxygen
Change ammonium.Wherein, the alkyl amine-oxides, alkyl phenol polyoxyethylene ether, alkyl polyoxyethylene ether, alkyl phenol polyoxyethylene ether sulfuric acid
Alkyl in rouge and alkyl phenol polyoxyethylene ether phosphate ester can be each independently the alkyl of C7-C12；The alkyl phenol polyoxy
Ethyoxyl in vinethene, alkyl polyoxyethylene ether, alkyl phenol polyoxyethylene ether sulfuric acid ester and alkyl phenol polyoxyethylene ether phosphate ester
Repetitive unit can be each independently 5-50.
The cationic surfactant is tetra-alkyl ammonium chloride and/or tetraalkyl ammonium bromide, it is further preferred that wherein at least one
A alkyl is the chain alkyl containing 12-18 carbon atom, and other alkyl are each independently selected from methyl, ethyl, propyl and fourth
One of base, it is further preferred that wherein one or two alkyl is the chain alkyl containing 12-18 carbon atom, other alkyl are each
From independently selected from methyl or ethyl；Most preferably, the cationic surfactant is dodecyl trimethyl ammonium chloride, 16
One of alkyl trimethyl ammonium chloride and octadecyltrimethylammonium chloride and the double octadecyl ammoniums of chlorodimethyl are a variety of.
Most preferably, the tetra-alkyl ammonium chloride is dodecyl trimethyl ammonium chloride, hexadecyltrimethylammonium chloride, octadecyl three
One of ammonio methacrylate and the double octadecyl ammoniums of chlorodimethyl are a variety of；The tetraalkyl ammonium bromide is dodecyl three
Methyl bromide ammonium, cetyl trimethylammonium bromide, Cetyltrimethylammonium bromide and bromoethyl dibasecylammonium bromide
One of or it is a variety of.
Wherein, the polymer can be the common various high molecular polymers for the displacement of reservoir oil in oil extraction field, excellent
In the case of choosing, can be realized the high molecular polymer of above-mentioned function example include singly be not limited to: polyacrylamide, xanthan gum and
One of hydrophobic associated polymer is a variety of.In a preferred embodiment of the invention, institute in preposed attributives A
Stating polymer is polyacrylamide.
The concentration of the surfactant and/or polymer in the preposed attributives A can be used for the conventional of this field
Amount, generally, the total concentration of the surfactant and aqueous solutions of polymers can be 1000-6000mg/L, preferably 2000-
5000mg/L.If the preposed attributives A is the aqueous solution containing surfactant or polymer, " total concentration " refers to surface
The concentration of activating agent or the concentration of polymer.If the preposed attributives A is the aqueous solution containing surfactant and polymer,
" total concentration " refers to the concentration of surfactant and polymer, and the wherein ratio of surfactant and polymer is optional
Select wider range, such as the mass ratio of surfactant and polymer can be 1-3:1.
The preposed attributives A can be obtained by various methods.Such as: it can be by the way that under stiring, the surface be lived
Property agent and/or polymer are mixed with water, obtain the preposed attributives A.The time the being stirred only guaranteed surface-active
Agent and/or polymer are sufficiently mixed uniformly.The mixed temperature can be room temperature.
According to the present invention, gas being injected after injecting preposed attributives A and being capable of forming foam section, further adjustment injection is cutd open
Face, sticks oil displacement system B and can preferably contact with crude oil to play the drop that is subsequently implanted into of protection and emulsify, raising emulsifiability
Effect.
According to the present invention, described drop sticks oil displacement system B as the reducing viscosity by emulsification oil displacement system with foam performance.The drop is glutinous
Oil displacement system B contains surfactant, alcohol, polymer and water.
Wherein, the surfactant can be selected from alkyl phenol polyoxyethylene ether sulfate, alkyl phenol polyoxyethylene ether carboxylic
One of hydrochlorate, alkyl polyglycoside, glycine betaine, petroleum sulfonate, tetra-alkyl ammonium chloride and tetraalkyl ammonium bromide are a variety of.Institute
The alkyl stated in alkyl phenol polyoxyethylene ether sulfate and alkyl phenol polyoxyethylene ether carboxylate can be each independently C7-
The repetitive unit of the alkyl of C12, ethyoxyl can be each independently 5-50；Alkyl in the alkyl polyglycoside can be
The alkyl of C8-C16.
In a kind of preferred embodiment of the invention, the surfactant is glycine betaine, with tetraalkyl chlorine
Change the combination of ammonium and/or tetraalkyl ammonium bromide.
In the tetra-alkyl ammonium chloride and tetraalkyl ammonium bromide, wherein at least one alkyl is each independently containing 12-
The chain alkyl of 18 carbon atoms, other alkyl are each independently selected from one of methyl, ethyl, propyl and butyl, it is preferable that
Wherein one or two alkyl is each independently the chain alkyl containing 12-18 carbon atom, and other alkyl are each independently
Selected from methyl or ethyl；Most preferably, the tetra-alkyl ammonium chloride is dodecyl trimethyl ammonium chloride, cetyl trimethyl chlorine
Change one of double octadecyl ammoniums of ammonium, octadecyltrimethylammonium chloride and chlorodimethyl or a variety of；The tetraalkyl bromine
Change ammonium is dodecyl trimethyl ammonium bromide, cetyl trimethylammonium bromide, Cetyltrimethylammonium bromide and bromination two
One of methyldioctadecylammonium is a variety of.
The glycine betaine has structure shown in following formula, and wherein at least one R is the long alkane containing 10-18 carbon atom
Base, other R are each independently selected from one of methyl, ethyl, propyl and butyl, it is preferable that one of R is to contain 10-18
The chain alkyl of a carbon atom, other R are methyl；Most preferably, the glycine betaine is dodecyldimethylammonium hydroxide inner salt, the tetradecane
One of base dimethyl betaine, Cetyl dimethyl betaine and octodecyl betaine are a variety of；
Wherein, the alcohol is the monohydric alcohol that carbon atom number is 1-12, preferably carbon atom number be 2-6 monohydric alcohol；It is more excellent
Choosing, the alcohol are ethyl alcohol and/or butanol.
Wherein, the polymer dropped in glutinous oil displacement system B can play stabilization to reducing viscosity by emulsification oil displacement system emulsion；
Under preferable case, the polymer is selected from polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan, polyvinyl alcohol and dredges
At least one of water association polymer.It is described to drop glutinous oil displacement system B in a preferred embodiment of the invention
In polymer be polyacrylamide.
According to the present invention, the selectable range for dropping each component content in glutinous oil displacement system B is wider, under preferable case,
From the angle for further increasing oil recovery factor, on the basis of the total weight for dropping glutinous oil displacement system B, the surface is living
Property agent content be 0.01-3 weight %, the content of the alcohol is 0.01-0.2 weight %, and the content of the polymer is 0.01-
0.5 weight %, the content of water are 96.3-99.97 weight %；
It is further preferred that the content of the surfactant is 0.2-1 on the basis of the total weight for dropping glutinous oil displacement system B
Weight %, the content of the alcohol are 0.02-0.1 weight %, and the content of the polymer is 0.1-0.3 weight %, the content of water
For 98.6-99.68 weight %.
According to the present invention it is possible to which obtaining described drop by various methods sticks oil displacement system B.Such as: it can be by will first gather
It closes object to be dissolved in the water of part, aqueous solutions of polymers is obtained, then under stiring, by the aqueous solutions of polymers and surface-active
Agent and alcohol and the mixing of part water, so that obtaining described drop sticks oil displacement system B.The time the being stirred only guaranteed polymerization
Object is sufficiently dissolved and is uniformly mixed with other components.The dissolution, the temperature mixed can be room temperature.
According to the present invention, the dosage for dropping each component in glutinous oil displacement system B preparation process can be glutinous according to the desired drop
Each component content is added in oil displacement system B, and the concrete content of each component hereinbefore has been described in detail, herein
It repeats no more.
According to the present invention, reducing viscosity by emulsification oil displacement system B replaces injection with gas, can enhance earth formation deep emulsifier with it is thick
The shear action of oil promotes earth formation deep viscous crude to emulsify, and strengthens oil displacement system in the emulsification oil cleaning of earth formation deep.Together
When the reducing viscosity by emulsification oil displacement system with foam performance that injects form foam in the gas of stratum High water cut region and injection and rise
To the effect of adjustment injection profile, significantly improve oil displacement process displacement efficiency and sweep efficiency.
According to the present invention, contain polymer in the protection slug C finally injected, the work for increasing viscosity can be further functioned as
With conducive to the progress of water drive later.
According to the present invention, the protection slug C is the aqueous solution containing high molecular polymer, can be realized above-mentioned function
The example of polymer includes but is not limited to: polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan, polyvinyl alcohol and dredge
At least one of water association polymer.Under preferable case, the polymer is polyacrylamide.The polymer is in the guarantor
The concentration protected in slug C can be the conventional amount used of this field, and generally, concentration of the polymer in the protection slug C can
Think 1000-5000mg/L, preferably 2000-3000mg/L.
The protection slug C can be obtained by various methods.Such as: it can be by under stiring, by the polymer
It is slowly dissolve into water, obtains the protection slug C.The time being stirred, only the guaranteed high molecular polymer was sufficiently molten
Solution.The temperature of the mixed dissolution can be room temperature.
According to the present invention, wherein preposed attributives A, drop glutinous oil displacement system B and protect in the polymer in slug C
To select lyophobic association polymer, the hydrophobic associated polymer includes: to pass through certainly using acryloyl ammonium as monomer with hydrophobic monomer
It is prepared by base copolymerization, for example, can be AP-P4 and AP-P5 (for example, Sichuan Guang Ya company produces) etc..
According to the present invention, preposed attributives A, the polymer dropped in glutinous oil displacement system B and protection slug C are preferably all poly- third
Alkene acyl ammonium.The polyacrylamide includes cationic polyacrylamide ammonium, anionic polyacrylamide and non-ionic poly-
Acryloyl ammonium, wherein
The cationic polyacrylamide ammonium refers to by cationic monomer, such as DM (dimethyl diallyl ammonium chloride), DMC
(2- methyl-propen acyloxyethyl trimethyl ammonium chloride), DMDAAC (dimethyl diallyl ammonium chloride or diallydimethyl
Ammonium chloride), DMAEMA (dimethylaminoethyl methacrylate) etc. and acryloyl ammonium be copolymerized to obtain.
The anionic polyacrylamide refer to containing acryloyl ammonium structural unit and acrylic acid structure unit and/
Or the polyacrylamide of acrylates structural unit, it can be and polyacrylamide to be carried out to partial hydrolysis under alkaline condition
It obtains.The degree of hydrolysis of the anionic polyacrylamide can be 5-35 moles of %.Preferably, the anionic polypropylene
The degree of hydrolysis of acyl ammonium is 10-30 moles of %.
The non-ionic polyacrylamide is the homopolymer of acryloyl ammonium monomer, is the low ion degree with high molecular weight
Linear polymer.
Degree of hydrolysis is usually as anion pp acyl ammonium parameter.In the present invention, the degree of hydrolysis (that is, ion degree) refers to
When hydrolysis, in polyacrylamide molecule, acyl ammonium group is converted into the percentage of carboxyl.In the present invention, the degree of hydrolysis is to use
What method specified in GB12005.6-89 determined.
Under preferable case, in order to further increase the synergistic effect of oil displacement system, the mesh for improving recovery ratio is better achieved
, a kind of specific embodiment according to the invention, when in preposed attributives A surfactant or polymer be cation
When type surfactant, nonionic surfactant or cationic polyacrylamide ammonium, the polymer in glutinous oil displacement system B drops
Preferably polyacrylamide, and the polyacrylamide is preferably cationic polyacrylamide ammonium, protects the polymer in slug C
Preferably polyacrylamide, and the polyacrylamide is preferably cationic polyacrylamide ammonium.Another kind according to the invention
Specific embodiment, when in preposed attributives A surfactant or polymer be anionic surfactant or yin from
When sub- polyacrylamide, the polymer dropped in glutinous oil displacement system B is preferably polyacrylamide, and the polyacrylamide is preferably
Anionic polyacrylamide or nonionic polyacrylamide, protecting the polymer in slug C is preferably polyacrylamide, and institute
Stating polyacrylamide is preferably anion pp acyl ammonium or nonionic polyacrylamide, more preferably anionic polyacrylamide
Ammonium.
The molecular weight of the polyacrylamide is not particularly limited in the present invention, and the polyacrylamide can have ability
Molecular weight well known to field technique personnel.In order to further ensure oil displacement system has certain apparent viscosity, emulsion is improved
Stability, it is preferable that the viscosity average molecular weigh of the polyacrylamide is 500 × 104-3000×104；It is highly preferred that described poly- third
The viscosity average molecular weigh of alkene acyl ammonium is 1500 × 104-2500×104.In the present invention, the viscosity average molecular weigh of the polyacrylamide is
It is measured according to method disclosed in GB/T 12005.10-92.
According to the present invention, glutinous oil displacement system B drops with good emulsifiability and lower boundary due to of the present invention
Face tension and frothing capacity, polymer therein, which can play to further function as, to be extended and when stablizing the oil displacement system emulsion
Between effect, so as to effectively improve the viscosity of the oil displacement system.Therefore, to the salinity for dropping water in glutinous oil displacement system B
Not ask especially, the salinity of water can even have the water of more high salinity for the conventional salinity of this field, for example,
The salinity of water can be 0-25 × 104mg/L.It is used ensuring that the finally obtained apparent viscosity for dropping glutinous oil displacement system B meets
It is described as in the glutinous oil displacement system B of drop from the angle for the cost for further decreasing method of the invention under conditions of it is required that
The water of solvent can be that salinity is 0-20 × 104Mg/L, calcium ions and magnesium ions content are 0-2 × 104The water of mg/L, more preferably mine
Change degree is 2 × 104-10×104Mg/L, calcium ions and magnesium ions content are 0.1 × 104-0.5×104The water of mg/L.As preposed attributives A
And it is 0-20 × 10 that the water in protection slug C as solvent, which may be salinity,4Mg/L, calcium ions and magnesium ions content be 0-2 ×
104The water of mg/L, preferably salinity are 2 × 104-10×104Mg/L, calcium ions and magnesium ions content are 0.1 × 104-0.5×104mg/
The water of L.The water that salinity meets above-mentioned requirements can be the water in various sources, such as: salinity meets the oil field of above-mentioned requirements
Recovered water, oilfield injection water, by by clear water (such as: salinity be 100-400 mg/litre water) with oil field extracted water (mine
Change degree is generally 3000-20000 mg/litre) mixing and the salinity that obtains meets the water of above-mentioned requirements.It is described in the present invention
Oil field extracted water before use can using well known to a person skilled in the art method (such as: specified in GB50428-2007
Method) oil field extracted water handled.
In the present invention, the salinity refers to the total content of the salt in water, the salt for example: calcium, magnesium, iron, aluminium and manganese etc.
Carbonate, heavy carbonate, chloride, sulfate, the nitrate of metal；And various sodium salts.Salinity in the present invention is root
According to gravimetric detemination specified in China-styled Certain Industry Field standard SL79-1994.
In the case of, according to the invention it is preferred to, liquids and gases are injected by periodic transformation, and make in injection process
Liquids and gases injection rate is alternately injected with fast-slow, and the shearing that can further strengthen earth formation deep emulsifier and viscous crude is made
With the emulsification of promotion earth formation deep viscous crude improves the washing oil and sweep efficiency of oil displacement process.Therefore, according to the present invention, preposition section
Plug A, the injection rate for dropping glutinous oil displacement system B and protection slug C are each independently 1-3 times of gas injection rate.
According to the present invention, the gas in the flooding method can be that oil extraction field is common various for the displacement of reservoir oil
Gas, the example that can be realized the gas of above-mentioned function include but is not limited to CO2, at least one of N2 and air, preferably
CO2。
According to the present invention, the preposed attributives A first injected in the flooding method and the volume ratio for the gas being subsequently injected into
Selectable range is wider, and from the angle for further increasing oil recovery factor, under the conditions of uniform pressure, that first injects is preposition
The volume ratio of slug A and the gas being subsequently injected into is 0.5-3:1, preferably 1-2:1.The flooding method according to the present invention, it is preceding
Setting slug A volume multiple is 0.01-0.1 times of pore volume.
According to the present invention, in the flooding method after injection preposed attributives A and gas, the drop injected every time is glutinous to be driven
The selectable range of the volume ratio of oil systems B and gas is wider, from the angle for further increasing oil recovery factor, identical
Under pressure condition, alternately the volume ratio of the glutinous oil displacement system B of the drop of injection and gas is 1:0.5-1, preferably 1:0.8-1 every time.
According to the present invention, it is 0.01-0.1 times of pore volume that the drop injected every time, which sticks oil displacement system B volume multiple,.Alternately inject
Number makes the total volume multiple of the glutinous oil displacement system B of the drop of injection and gas be preferably 0.1-0.6 times of pore volume.
According to the present invention, in the flooding method after glutinous oil displacement system B and gas drop in alternately injection, the protection of injection
Slug C volume multiple is 0.01-0.1 times of pore volume.
Oil displacement agent composition provided by the invention can be applied to the displacement of reservoir oil of various oil reservoirs, especially suitable for heavy crude reservoir,
Viscosity is less than 10000mPa.s to the heavy crude reservoir in the earth formation.
In addition to being driven using the method progress oil reservoir oil displacement of fluid-gas of the present invention periodically alternately injection to improve
Except oily efficiency, other conditions of the oil reservoir oil displacement are not particularly limited in the present invention, can use those skilled in the art
Method well known to member, such as the step of carrying out water drive after can also being included in.
The present invention will be described in detail by way of examples below.
The calculation formula of measurement of water-content coefficient method and recovery ratio in following embodiment are as follows:
During rock core displacement, the every 2min sampling in rock core outlet end is primary；
Water body accumulated amount/liquid volume total amount × 100% in moisture content=sample；
Recovery ratio=crude oil produced quantity/initial oil amount × 100%.
Embodiment 1
The present embodiment is used to illustrate the preparation and performance of each slug provided by the invention.
(1) preposed attributives A: 800g clear water (salinity 0mg/L) is weighed, polyacrylamide is added under agitation
(viscosity-average molecular weight 3000 × 104, degree of hydrolysis 20%) and 3g, stirring and dissolving 4h.Cationic surfactant chlorodimethyl is added
Double octadecyl ammonium 3g, add water to 1000g, and stirring 20-30min is to being completely dissolved.
It drops glutinous oil displacement system B: weighing 800g clear water (salinity 0mg/L), polyacrylamide is added under agitation
(viscosity-average molecular weight 3000 × 104, degree of hydrolysis 20%) and 3g, stirring and dissolving 4h.Cationic surfactant chlorodimethyl is added
Double octadecyl ammonium 3g are added octodecyl betaine 3g, add ethyl alcohol 0.5g, add water to 1000g, stir 20-
30min is to being completely dissolved.
Protection slug C: weighing 800g clear water (salinity 0mg/L), and it is (glutinous equal that polyacrylamide is added under agitation
Molecular weight 3000 × 104, degree of hydrolysis 20%) and 3g, stirring and dissolving 4h.Add water to 1000g, stirring 20-30min is to being completely dissolved.
(2) it takes above-mentioned preposed attributives A, drop glutinous oil displacement system B and viscous crude (50 DEG C of viscosity 9600mPa.s), in 70 DEG C of conditions
Lower use Model TX500C interfacial tension measurement interfacial tension is respectively 1.8 × 10-4MN/m and 5.3 × 10-3mN/m.?
In 100mL beaker, above-mentioned preposed attributives A is taken respectively, drops glutinous oil displacement system B 30g addition 70g viscous crude, beaker is placed in 70 DEG C
Constant temperature 2h in water-bath is stirred 3 minutes.Brookfield DV-II viscosmeter is used under the conditions of 70 DEG C, in shear rate
7.34S-1Under the conditions of, measurement mixed liquor viscosity is respectively 80mPa.s and 63mPa.s.
Embodiment 2
The present embodiment is used to illustrate the using effect that flooding method improves viscous crude recovery ratio.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 1).Rock core is dry, vacuumize saturated water, is saturated viscous crude (with embodiment 1) under the conditions of 70 DEG C, aging
48h.(1) 1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives are injected with 1.5mL/min injection rate
A 0.05PV injects CO with 1.0mL/min injection rate20.05PV；(3) the glutinous displacement of reservoir oil is dropped with the injection of 1.5mL/min injection rate
System B0.05PV injects CO with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(4) with 1.5mL/
Min injection rate injection protection slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 22.5%；It is aqueous after injection oil displacement agent to drop to 61 volume % by 95 volume %,
Decline 34%；Recovery ratio rises 56.0%, improves recovery ratio 33.5%.
Embodiment 3
The present embodiment is used to illustrate the preparation and performance of each slug provided by the invention.
(1) using concentrated water (salinity 100000mg/L, wherein Ca2+Concentration: 10000mg/L), prepare preposition section
It fills in A, drop glutinous oil displacement system B and protection slug C.Preparation method is the same as embodiment 1.
(2) it takes above-mentioned preposed attributives A, drop glutinous oil displacement system B and viscous crude (50 DEG C of viscosity 9600mPa.s), in 70 DEG C of conditions
Lower use Model TX500C interfacial tension measurement interfacial tension is respectively 3.9 × 10-4MN/m and 6.3 × 10-3mN/m.?
In 100mL beaker, above-mentioned preposed attributives A is taken respectively, drops glutinous oil displacement system B 30g addition 70g viscous crude, beaker is placed in 70 DEG C
Constant temperature 2h in water-bath is stirred 3 minutes.Brookfield DV-II viscosmeter is used under the conditions of 70 DEG C, in shear rate
7.34S-1Under the conditions of, measurement mixed liquor viscosity is respectively 60mPa.s and 43mPa.s.
Embodiment 4
The present embodiment is used to illustrate the using effect that flooding method improves viscous crude recovery ratio.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 3).Rock core is dry, vacuumize saturated water, is saturated viscous crude (with embodiment 1) under the conditions of 70 DEG C, aging
48h.(1) 1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives are injected with 1.5mL/min injection rate
A0.05PV injects CO with 1.0mL/min injection rate20.05PV；(3) the glutinous displacement of reservoir oil is dropped with the injection of 1.5mL/min injection rate
System B0.05PV injects CO with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(4) with 1.5mL/
Min injection rate injection protection slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 21.7%；It is aqueous after injection oil displacement agent to drop to 69 volume % by 95 volume %,
Decline 26%；Recovery ratio rises 53.0%, improves recovery ratio 31.3%.
Embodiment 5
The present embodiment is used to illustrate the preparation and performance of each slug provided by the invention.
(1) using concentrated water (salinity 200000mg/L, wherein Ca2+Concentration: 20000mg/L), prepare preposition section
It fills in A, drop glutinous oil displacement system B and protection slug C.Preparation method is the same as embodiment 1.
(2) it takes above-mentioned preposed attributives A, drop glutinous oil displacement system B and viscous crude (50 DEG C of viscosity 9600mPa.s), in 70 DEG C of conditions
Lower use Model TX500C interfacial tension measurement interfacial tension is respectively 1.9 × 10-3MN/m and 7.3 × 10-3mN/m.?
In 100mL beaker, above-mentioned preposed attributives A is taken respectively, drops glutinous oil displacement system B 30g addition 70g viscous crude, beaker is placed in 70 DEG C
Constant temperature 2h in water-bath is stirred 3 minutes.Brookfield DV-II viscosmeter is used under the conditions of 70 DEG C, in shear rate
7.34S-1Under the conditions of, measurement mixed liquor viscosity is respectively 68mPa.s and 53mPa.s.
Embodiment 6
The present embodiment is used to illustrate the using effect that flooding method improves viscous crude recovery ratio.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 5).Rock core is dry, vacuumize saturated water, is saturated viscous crude (with embodiment 1) under the conditions of 70 DEG C, aging
48h.(1) 1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives are injected with 1.5mL/min injection rate
A0.05PV injects CO with 1.0mL/min injection rate20.05PV；(3) the glutinous displacement of reservoir oil is dropped with the injection of 1.5mL/min injection rate
System B0.05PV injects CO with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(4) with 1.5mL/
Min injection rate injection protection slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 20.5%；It is aqueous after injection oil displacement agent to drop to 71 volume % by 95 volume %,
Decline 24%；Recovery ratio rises 49.0%, improves recovery ratio 28.5%.
Embodiment 7
The present embodiment is used to illustrate the preparation and performance of each slug provided by the invention.
(1) using concentrated water (salinity 100000mg/L, wherein Ca2+Concentration: 10000mg/L) prepare preposed attributives
A, glutinous oil displacement system B and protection slug C drop.Concrete configuration method is as follows:
Preposed attributives A: weighing 800g water, and surfactant octadecyldimethyl ammonium chloride is added under agitation
3g, dodecyldimethyl ammonium oxide 1g, polyacrylamide (viscosity-average molecular weight 3000 × 104, degree of hydrolysis 20%) and 1g, is stirred molten
Solve 4h.1000g is added water to, 20-30min is stirred.
Drop glutinous oil displacement system B: weighing 800g water, be added under agitation polyacrylamide (viscosity-average molecular weight 3000 ×
104, degree of hydrolysis 20%) and 2g, stirring and dissolving 4h.Surfactant nonylphenol polyoxyethylene ether (10) sodium sulphate 5g is added, is added
Octodecyl betaine 5g adds ethyl alcohol 1.0g, adds water to 1000g, and stirring 20-30min is to being completely dissolved.
Protection slug C: weighing 800g water, and polyacrylamide (viscosity-average molecular weight 3000 × 10 is added under agitation4,
Degree of hydrolysis 20%) 5g, stirring and dissolving 4h.Add water to 1000g, stirring 20-30min is to being completely dissolved.
(2) it takes above-mentioned preposed attributives A, drop glutinous oil displacement system B and viscous crude (50 DEG C of viscosity 10000mPa.s), in 70 DEG C of conditions
Lower use Model TX500C interfacial tension measurement interfacial tension is respectively 1.5 × 10-2MN/m and 6.9 × 10-3mN/m.?
In 100mL beaker, above-mentioned preposed attributives A is taken respectively, drops glutinous oil displacement system B 30g addition 70g viscous crude, beaker is placed in 70 DEG C
Constant temperature 2h in water-bath is stirred 3 minutes, can form uniform oil-in-water emulsion.Brookfield is used under the conditions of 70 DEG C
DV-II viscosmeter, in shear rate 7.34S-1Under the conditions of, measurement mixed liquor viscosity is respectively 70mPa.s and 62mPa.s.
Embodiment 8
The present embodiment is used to illustrate the using effect that flooding method improves viscous crude recovery ratio.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 7).Rock core is dry, vacuumize saturated water, is saturated viscous crude, aging 48h under the conditions of 70 DEG C.(1)
1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives A is injected with 1.5mL/min injection rate
0.05PV injects CO with 1.0mL/min injection rate20.05PV；(3) glutinous displacement of reservoir oil body is dropped with the injection of 1.5mL/min injection rate
It is B 0.05PV, CO is injected with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(4) with 1.5mL/
Min injection rate injection protection slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 21.8%, inject oil displacement agent after it is aqueous drop to 70 volume % by 95 volume %,
Decline 25%；Recovery ratio rises 46.9%, improves recovery ratio 25.1%.
Embodiment 9
The present embodiment is used to illustrate the preparation and performance of each slug provided.
(1) using concentrated water (salinity 100000mg/L, wherein Ca2+Concentration: 10000mg/L) prepare preposed attributives
A, glutinous oil displacement system B and protection slug C drop.Concrete configuration method is as follows:
Preposed attributives A: weighing 1000g water, and surfactant sodium dodecyl base dimethyl ammonium is added under agitation
1g stirs 20-30min.
It drops glutinous oil displacement system slug B: weighing 800g water, polyacrylamide (viscosity-average molecular weight is added under agitation
3000×104, degree of hydrolysis 20%) and 1g, stirring and dissolving 4h.Surfactant nonylphenol polyoxyethylene ether (10) sodium sulphate is added
5g is added octodecyl betaine 1.5g, adds ethyl alcohol 0.5g, adds water to 1000g, and stirring 20-30min is to complete
Dissolution.
Protection slug C: weighing 800g water, and polyacrylamide (viscosity-average molecular weight 3000 × 10 is added under agitation4,
Degree of hydrolysis 20%) 1g, stirring and dissolving 4h.Add water to 1000g, stirring 20-30min is to being completely dissolved.
(2) it takes above-mentioned preposed attributives A, drop glutinous oil displacement system B solution and viscous crude (50 DEG C of viscosity 10000mPa.s), at 70 DEG C
Under the conditions of using Model TX500C interfacial tensimeter measurement interfacial tension be respectively 2.1 × 10-2MN/m and 9.0 × 10-3mN/
m.In 100mL beaker, takes above-mentioned preposed attributives A, slug B 30g that 70g viscous crude is added respectively, beaker is placed in 70 DEG C of water-baths
Middle constant temperature 2h stirs 3 minutes, forms uniform oil-in-water emulsion.Brookfield DV-II viscosity is used under the conditions of 70 DEG C
Meter, in shear rate 7.34S-1Under the conditions of, measurement mixed liquor viscosity is respectively 112mPa.s and 89mPa.s.
Embodiment 10
The present embodiment is used to illustrate the using effect that flooding method improves viscous crude recovery ratio.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 9).Rock core is dry, vacuumize saturated water, is saturated viscous crude, aging 48h under the conditions of 70 DEG C.(1)
1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives A is injected with 1.5mL/min injection rate
0.05PV injects CO with 1.0mL/min injection rate20.05PV；(3) glutinous displacement of reservoir oil body is dropped with the injection of 1.5mL/min injection rate
It is B 0.05PV, CO is injected with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(4) with 1.5mL/
Min injection rate injection protection slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 22.4%, inject oil displacement agent after it is aqueous drop to 79 volume % by 95 volume %,
Decline 16%；Recovery ratio rises 45.5%, improves recovery ratio 23.1%.
Embodiment 11
The present embodiment is used to illustrate the preparation and performance of each slug provided by the invention.
(1) using concentrated water (salinity 100000mg/L, wherein Ca2+Concentration: 10000mg/L) prepare preposed attributives
A, glutinous oil displacement system B and protection slug C drop.Concrete configuration method is as follows:
Preposed attributives A: weighing 800g water, and surfactant octadecyldimethyl ammonium chloride is added under agitation
3g, dodecyldimethyl ammonium oxide 1g, cation polypropylene acyl ammonium (viscosity-average molecular weight 1200 × 104, ion degree 10%) and 1g,
Stirring and dissolving 4h.1000g is added water to, 20-30min is stirred.
It drops glutinous oil displacement system B: weighing 800g water, cation polypropylene acyl ammonium (viscosity-average molecular weight is added under agitation
1200×104, ion degree 10%) and 2g, stirring and dissolving 4h.Surfactant nonylphenol polyoxyethylene ether (10) sodium sulphate is added
5g is added octodecyl betaine 5g, adds ethyl alcohol 1.0g, adds water to 1000g, and stirring 20-30min is to completely molten
Solution.
Protection slug C: weighing 800g water, and cation polypropylene acyl ammonium (viscosity-average molecular weight 1200 is added under agitation
×104, ion degree 10%) and 5g, stirring and dissolving 4h.Add water to 1000g, stirring 20-30min is to being completely dissolved.
(2) it takes above-mentioned preposed attributives A, drop glutinous oil displacement system B and viscous crude (50 DEG C of viscosity 10000mPa.s), in 70 DEG C of conditions
Lower use Model TX500C interfacial tension measurement interfacial tension is respectively 1.6 × 10-2MN/m and 6.0 × 10-3mN/m.?
In 100mL beaker, above-mentioned preposed attributives A is taken respectively, drops glutinous oil displacement system B 30g addition 70g viscous crude, beaker is placed in 70 DEG C
Constant temperature 2h in water-bath is stirred 3 minutes, can form uniform oil-in-water emulsion.Brookfield is used under the conditions of 70 DEG C
DV-II viscosmeter, in shear rate 7.34S-1Under the conditions of, measurement mixed liquor viscosity is respectively 58mPa.s and 49mPa.s.
Embodiment 12
The present embodiment is used to illustrate the using effect that flooding method improves viscous crude recovery ratio.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 11).Rock core is dry, vacuumize saturated water, is saturated viscous crude, aging 48h under the conditions of 70 DEG C.(1)
1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives A is injected with 1.5mL/min injection rate
0.05PV injects CO with 1.0mL/min injection rate20.05PV；(3) glutinous displacement of reservoir oil body is dropped with the injection of 1.5mL/min injection rate
It is B 0.05PV, CO is injected with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(4) with 1.5mL/
Min injection rate injection protection slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 23.5% aqueous drops to 65.5 bodies by 95 volume % after injecting oil displacement agent
Product %, decline 29.5%；Recovery ratio rises 50.5%, improves recovery ratio 27.0%.
Comparative example 1
This comparative example is used to illustrate the using effect of the different injection mode displacement of reservoir oils.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement system is with embodiment 1).Rock core is dry, vacuumize saturated water, is saturated viscous crude (with embodiment 1) under the conditions of 70 DEG C, aging
48h.(1) 1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) preposed attributives are injected with 1.5mL/min injection rate
A 0.05PV injects CO with 1.5mL/min injection rate20.05PV；(3) the glutinous displacement of reservoir oil is dropped with the injection of 1.5mL/min injection rate
System B0.15PV injects CO with 1.5mL/min injection rate20.15PV.(4) it is injected and is protected with 1.5mL/min injection rate
Slug C 0.05PV；(5) water drive is continued to aqueous 95 volume % with 1.5mL/min injection rate.
Experimental result: waterflood recovery efficiency factor 20.3%；It is aqueous after injection oil displacement agent to drop to 82 volume % by 95 volume %,
Decline 13%；Recovery ratio rises 38.4%, improves recovery ratio 18.1%.
Comparative example 2
This comparative example is used to illustrate the using effect of the different injection mode displacement of reservoir oils.
Use specification for 4.5mm × 4.5mm × 300mm, permeability is that the rock core of 3000md carries out improving recovery ratio experiment
(oil displacement agent is 0.3 weight % petroleum sulfonate).Rock core is dry, vacuumize saturated water, viscous crude is saturated under the conditions of 70 DEG C (with implementation
Example 1), aging 48h.(1) 1.5mL/min injection rate water drive is to aqueous 95 volume %.(2) with 1.5mL/min injection rate note
Enter above-mentioned oil displacement agent 0.05PV, CO is injected with 1.0mL/min injection rate20.05PV repeats alternately to inject 3 periods.(3)
Continue water drive to aqueous 95 volume % with 1.5mL/min injection rate.Experimental result: waterflood recovery efficiency factor 21.0%；Injection is driven
It is aqueous after finish to drop to 85 volume %, decline 10% by 95 volume %；Recovery ratio rises 33.8%, improves recovery ratio
12.8%.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (15)
1. a kind of oil reservoir oil displacement method, which is characterized in that the flooding method includes: to inject preposition section into oil reservoir from injection well
A is filled in, gas is then injected into, then successively alternately glutinous oil displacement system B and gas drop in injection, are then injected into protection slug C, finally infuse
Water；
Wherein, the preposed attributives A is the aqueous solution containing surfactant and/or polymer, and the glutinous oil displacement system B of drop contains
There are surfactant, alcohol, polymer and water；The protection slug C is the aqueous solution containing polymer.
2. flooding method according to claim 1, wherein in the preposed attributives A,
The surfactant is in anionic surfactant, nonionic surfactant and cationic surfactant
It is one or more；
The polymer is selected from one of polyacrylamide, xanthan gum and hydrophobic associated polymer or a variety of.
3. flooding method according to claim 2, wherein in the preposed attributives A,
The anionic surfactant is selected from alkyl phenol polyoxyethylene ether sulfate, alkyl phenol polyoxyethylene ether phosphate and alkane
One of base phenol polyethenoxy ether carboxylate is a variety of, wherein alkyl is each independently the alkyl of C7-C12, ethyoxyl
Repetitive unit is each independently 5-50；
The nonionic surfactant is selected from alkyl amine-oxides, alkyl phenol polyoxyethylene ether, alkyl polyoxyethylene ether, alkyl phenol
One of polyoxyethylene ether sulfuric acid ester and alkyl phenol polyoxyethylene ether phosphate ester are a variety of, wherein alkyl is each independently
The repetitive unit of the alkyl of C7-C12, ethyoxyl is each independently 5-50；
The cationic surfactant is tetra-alkyl ammonium chloride and/or tetraalkyl ammonium bromide, it is further preferred that at least one alkyl is
Chain alkyl containing 12-18 carbon atom, other alkyl are each independently selected from one in methyl, ethyl, propyl and butyl
Kind, it is further preferred that one or two alkyl is the chain alkyl containing 12-18 carbon atom, other alkyl are each independently selected from
Methyl or ethyl；Most preferably, the tetra-alkyl ammonium chloride is dodecyl trimethyl ammonium chloride, cetyl trimethyl chlorination
One of double octadecyl ammoniums of ammonium, octadecyltrimethylammonium chloride and chlorodimethyl are a variety of；The tetraalkyl bromination
Ammonium is dodecyl trimethyl ammonium bromide, cetyl trimethylammonium bromide, Cetyltrimethylammonium bromide and bromination diformazan
One of double octadecyl ammoniums of base are a variety of；
The polymer is polyacrylamide, and the viscosity-average molecular weight of the polyacrylamide is 500 × 104-3000×104。
4. flooding method according to claim 2 or 3, wherein in the preposed attributives A, surfactant and polymer
The total concentration of aqueous solution is 1000-6000mg/L, preferably 2000-5000mg/L.
5. flooding method according to claim 1, wherein it is described to drop in glutinous oil displacement system B,
The surfactant is selected from alkyl phenol polyoxyethylene ether sulfate, alkyl phenol polyoxyethylene ether carboxylate, alkyl polysaccharide
One of glycosides, glycine betaine, petroleum sulfonate, tetra-alkyl ammonium chloride and tetraalkyl ammonium bromide are a variety of, wherein the alkyl phenol
Alkyl in polyoxyethylene ether sulfate and alkyl phenol polyoxyethylene ether carboxylate is each independently the alkyl of C7-C12, second
The repetitive unit of oxygroup is each independently 5-50；The alkyl that alkyl in the alkyl polyglycoside is C8-C16；
The alcohol is the monohydric alcohol that carbon atom number is 1-12, preferably carbon atom number be 2-6 monohydric alcohol；
The polymer is selected from polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan, polyvinyl alcohol and hydrophobic association
At least one of polymer.
6. flooding method according to claim 5, wherein it is described to drop in glutinous oil displacement system B,
The surfactant is glycine betaine, the combination with tetra-alkyl ammonium chloride and/or tetraalkyl ammonium bromide, the glycine betaine tool
There is structure shown in following formula, wherein at least one R is the chain alkyl containing 10-18 carbon atom, and other R are selected each independently
From one of methyl, ethyl, propyl and butyl；
It is preferred that one of R is the chain alkyl containing 10-18 carbon atom, other R are methyl；
Most preferably, the glycine betaine is dodecyldimethylammonium hydroxide inner salt, dodecyldimethylamine base glycine betaine, etradecyldimethylamine
One of base glycine betaine and octodecyl betaine are a variety of；
In the tetra-alkyl ammonium chloride and tetraalkyl ammonium bromide, wherein at least one alkyl is each independently containing 12-18
The chain alkyl of carbon atom, other alkyl are each independently selected from one of methyl, ethyl, propyl and butyl；
It is preferred that wherein one or two alkyl is each independently the chain alkyl containing 12-18 carbon atom, other alkyl are each
From independently selected from methyl or ethyl；
Most preferably, the tetra-alkyl ammonium chloride is dodecyl trimethyl ammonium chloride, hexadecyltrimethylammonium chloride, octadecane
One of base trimethyl ammonium chloride and the double octadecyl ammoniums of chlorodimethyl are a variety of；The tetraalkyl ammonium bromide is dodecane
Base trimethylammonium bromide, cetyl trimethylammonium bromide, Cetyltrimethylammonium bromide and bromination dimethyldioctadecylammonium
One of base ammonium is a variety of；
The alcohol is ethyl alcohol and/or butanol；
The polymer is polyacrylamide, and the viscosity-average molecular weight of polyacrylamide is 500 × 104-3000×104。
7. flooding method according to claim 5 or 6, wherein on the basis of the total weight for dropping glutinous oil displacement system B,
The content of the surfactant is 0.01-3 weight %, and the content of the alcohol is 0.01-0.2 weight %, the polymer
Content is 0.01-0.5 weight %, and the content of water is 96.3-99.97 weight %；
It is preferred that the content of the surfactant is 0.2-1 weight % on the basis of the total weight for dropping glutinous oil displacement system B,
The content of the alcohol is 0.02-0.1 weight %, and the content of the polymer is 0.1-0.3 weight %, and the content of water is 98.6-
99.68 weight %.
8. flooding method according to claim 1, wherein in the protection slug C,
The polymer is selected from polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan, polyvinyl alcohol and hydrophobic association
At least one of polymer；
It is preferred that the polymer is polyacrylamide, the viscosity average molecular weigh of polyacrylamide is 500 × 104-3000×104。
9. flooding method according to claim 8, wherein in the protection slug C, the concentration of aqueous solutions of polymers is
1000-5000mg/L, preferably 2000-3000mg/L.
10. flooding method described in any one of -9 according to claim 1, wherein preposed attributives A, drop glutinous oil displacement system B with
And the salinity of water is 0-20 × 10 in protection slug C4Mg/L, calcium ions and magnesium ions content are 0-2 × 104mg/L；It is preferred that the mine of water
Change degree is 2 × 104-10×104Mg/L, calcium ions and magnesium ions content are 0.1 × 104-0.5×104mg/L。
11. flooding method described in any one of -9 according to claim 1, wherein the gas is selected from CO2、N2In air
At least one.
12. flooding method according to claim 1, wherein under the conditions of uniform pressure, the preposed attributives A that first injects with
The volume ratio for the gas being subsequently injected into is 0.5-3:1, preferably 1-2:1；Under the conditions of uniform pressure, the drop injected every time is glutinous to be driven
The volume ratio of oil systems B and gas is 1:0.5-1, preferably 1:0.8-1.
13. according to claim 1 or flooding method described in 12, wherein preposed attributives A volume multiple is 0.01-0.1 times of hole
Volume, it is 0.01-0.1 times of pore volume that the drop injected every time, which sticks oil displacement system B volume multiple, and alternately the number of injection to infuse
The total volume multiple of the glutinous oil displacement system B of the drop entered and gas is 0.1-0.6 times of pore volume, and protection slug C volume multiple is
0.01-0.1 times of pore volume.
14. flooding method according to claim 13, wherein preposed attributives A, drop glutinous oil displacement system B and protection slug C
Injection rate be each independently 1-3 times of gas injection rate.
15. flooding method according to claim 1, wherein the oil reservoir is viscous crude, and the heavy crude reservoir sticks in the earth formation
Degree is less than 10000mPa.s.
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| CN110410047B (en) * | 2019-06-17 | 2021-09-28 | 中国石油天然气股份有限公司 | Oil displacement method for high-gas-content oil field and gas energy release oil displacement agent thereof |
| CN110439517A (en) * | 2019-07-12 | 2019-11-12 | 浙江海洋大学 | A kind of flooding method suitable for heavy crude reservoir |
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| CN110529085A (en) * | 2019-08-21 | 2019-12-03 | 中国石油化工股份有限公司 | A kind of chemical flooding method of heavy crude reservoir |
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| CN111139051A (en) * | 2020-04-07 | 2020-05-12 | 山东新港化工有限公司 | Foam channeling sealing agent for CO2 flooding of heavy oil reservoir and preparation method and application thereof |
| CN111849449A (en) * | 2020-06-28 | 2020-10-30 | 中国石油大学(北京) | Supercritical CO2Oil displacement system and oil displacement method |
| CN111849449B (en) * | 2020-06-28 | 2021-10-22 | 中国石油大学(北京) | Supercritical CO2Oil displacement system and oil displacement method |
| CN114059978A (en) * | 2020-08-03 | 2022-02-18 | 中国石油化工股份有限公司 | Chemical cold-production method for strong water-sensitive heavy oil reservoir |
| CN114059978B (en) * | 2020-08-03 | 2024-05-07 | 中国石油化工股份有限公司 | Chemical cold recovery method for strong water-sensitive heavy oil reservoir |
| CN112521317A (en) * | 2020-12-15 | 2021-03-19 | 陕西科技大学 | Sulfonated naphthol bola type surfactant for flooding heavy oil reservoir and synthetic method and application thereof |
| CN115126455A (en) * | 2021-03-24 | 2022-09-30 | 中国石油化工股份有限公司 | Chemical composite cold recovery method for strong water-sensitive heavy oil reservoir and application thereof |
| CN114836185A (en) * | 2022-05-23 | 2022-08-02 | 西南石油大学 | In-situ spontaneous tackifying thickened oil displacement system and preparation method thereof |
| CN115711112A (en) * | 2022-10-31 | 2023-02-24 | 西南石油大学 | Pressure-reducing injection-increasing system and injection-increasing method for polymer flooding |
| CN115418211A (en) * | 2022-11-07 | 2022-12-02 | 山东东方盛嘉石油科技有限责任公司 | Viscosity-reducing oil displacement agent for thick oil and preparation method thereof |
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