CN110105936A - Heat-resistant salt-resistant foam profile system and its preparation method and application suitable for Complex Reservoir - Google Patents
Heat-resistant salt-resistant foam profile system and its preparation method and application suitable for Complex Reservoir Download PDFInfo
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- CN110105936A CN110105936A CN201910421174.8A CN201910421174A CN110105936A CN 110105936 A CN110105936 A CN 110105936A CN 201910421174 A CN201910421174 A CN 201910421174A CN 110105936 A CN110105936 A CN 110105936A
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Abstract
The present invention provides a kind of transfer drive systems, by weight percentage include: 1%~3% nano-titanium dioxide, 0.2%~0.9% cetyl trimethylammonium bromide, the water of 0.01%~0.3% partially hydrolyzed polyacrylamide (PHPA) and surplus.The present invention also provides the preparation method of the transfer drive system, purposes and use the transfer drive system for the flooding method of oil reservoir.Transfer drive system of the invention is suitable for the Complex Reservoir of condition harshness, and the characteristic with heat-resistant salt-resistant can be realized excellent oil displacement efficiency.
Description
Technical field
The invention belongs to technical field of petroleum extraction, and specifically, the present invention provides a kind of suitable for the resistance to of Complex Reservoir
Warm salt tolerant foam profile system and its preparation method and application.
Background technique
Domestic each elephant is after primary oil recovery and secondary oil recovery, and crude oil water content grows steadily, and most of oil field is
Into tertiary phase.Tertiary oil recovery mainly changes water-oil mobility ratio by the way that chemical substance is added, and then improves crude oil and adopt
Yield, more the most commonly used is alkali drive, polymer flooding, surfactant flooding and binary or ternary combination floodings etc. at present.Foams
System is high by its apparent viscosity, and meets oil defoaming, meets the stable advantage of water, and foam profile technology is come into being and has been successfully applied to
The fields such as the displacement of reservoir oil.However influenced by factors such as water flooding dilution, stratum absorption, foaming agent effective concentration is being transported in foam system
It is gradually decreased during moving, foam stability is deteriorated, and validity period shortens.
Nano material is the brand-new material being concerned in recent years, and nano particle diameter is tiny, is existed largely in crystal grain
The atom of interior defect so that nano particle has the incomparable characteristic of many conventional granulates, as superplasticity, bigger serface,
High epistasis etc..Nano particle has better thermal stability and chemical stability, thus can exist under harsh formation condition.
Since the activity of simple nano material is poor, swept volume can not be expanded, good profile modification, therefore Chang Li can not be played
It is used after obtaining higher interfacial activity with surfactant compound with electrostatic interaction.
One kind is disclosed application No. is 201811298872.5 Chinese invention patent application to be matched by highly mineralized formation brines
Heat-resistant salt-resistant foam profile system made of system, including following component based on mass fraction: 0.5%~2% nanometer titanium dioxide
Silicon, 0.01%~2% myristyl hydroxy sulfo lycine, 0.01%~0.5% partially hydrolyzed polyacrylamide (PHPA) and
0.01%~0.3% citrate and excess water, and disclose the displacement of reservoir oil using the heat-resistant salt-resistant foam profile system
Method.But component needed for the oil displacement system is more, and preparation method is complex.
Application No. is 201610936584.2 Chinese invention patent applications to disclose a kind of surfactant micellar displacement of reservoir oil
Agent uses lauryl sodium sulfate (SDS) and silica to be compounded to obtain foam system, but its temperature tolerance is poor, and
And since certain counter ion is added, applicable salinity range is relatively low.Due to the more harsh (temperature of Complex Reservoir condition
Be 130 DEG C, total salinity 220000mg/L), using simple surfactant foam system under the conditions of high temperature and high salt very
It is easy to happen defoaming, still, the most temperature-resistant anti-salt ability of current displacement of reservoir oil foam system is poor, is not applied for high temperature, with high salt
Reservoir.
Summary of the invention
Goal of the invention of the invention is aiming at the problems existing in the prior art, to provide a kind of suitable for the resistance to of Complex Reservoir
Warm salt tolerant foam profile system and its preparation method and application.
On the one hand, the present invention provides a kind of transfer drive systems, by weight percentage include: 1%~3% nanometer titanium dioxide
Titanium, 0.2%~0.9% cetyl trimethylammonium bromide, 0.01%~0.3% partially hydrolyzed polyacrylamide (PHPA) and surplus
Water.
Further, transfer drive system includes: 1%~2% nano-titanium dioxide by weight percentage, and 0.5%~0.9% ten
Six alkyl trimethyl ammonium bromides, the water of 0.01%~0.2% partially hydrolyzed polyacrylamide (PHPA) and surplus；
Preferably, transfer drive system includes: 2% nano-titanium dioxide, 0.9% cetyl trimethyl by weight percentage
Ammonium bromide, the water of 0.1% partially hydrolyzed polyacrylamide (PHPA) and surplus.
Further, the nano-titanium dioxide is hydrophily self-dispersing nano-titanium dioxide.
Further, the average grain diameter of the nano-titanium dioxide is 10~30nm, preferably 30nm.
Further, the molecular weight of the partially hydrolyzed polyacrylamide (PHPA) is 500~12,000,000, and degree of hydrolysis is 5%~20%；
Preferably, the molecular weight of the partially hydrolyzed polyacrylamide (PHPA) is 7,000,000, and degree of hydrolysis is 10%.
Further, the water is simulation mineralized water.
On the other hand, the present invention provides a kind of preparation methods of transfer drive system, comprising:
(1) cetyl trimethylammonium bromide is added to the water dissolution and obtains cetyl trimethylammonium bromide solution；
(2) nano-titanium dioxide is added in the cetyl trimethylammonium bromide solution to obtain nano-titanium dioxide equal
The mixed solution of even dispersion；
(3) partially hydrolyzed polyacrylamide (PHPA) is added in the mixed solution, is stirred evenly, obtain the transfer drive system.
On the other hand, the present invention provides transfer drive systems, and the purposes in the displacement of reservoir oil is being carried out to oil reservoir.
On the other hand, the present invention provides a kind of flooding methods for oil reservoir, comprising: includes transfer drive body to stratum injection
The principal piece plug of system.
Further, flooding method includes:
Step 1: injecting preposition pretreatment section to stratum according to 0.1%~1% that volume injection rate is formation pore volume
Plug；
Step 2: including the transfer drive to stratum injection according to 30%~50% that volume injection rate is formation pore volume
The principal piece plug of system and nitrogen；
Step 3: injecting postposition to stratum according to 0.1%~1% that volume injection rate is formation pore volume and protect slug；
Step 4: closing well.
Further, in step 1, the preposition pretreatment slug is 16 that concentration is 0.1mmol/L~0.5mmol/L
Alkyl trimethyl ammonium bromide solution.
It further, in step 2, is that 1: 1 to 1: 3 (preferably 1: 2) will according to the volume ratio of the transfer drive system and nitrogen
The transfer drive system and nitrogen alternately inject stratum.
Further, in step 3, the postposition protection slug is the nanometer that mass concentration is 1%~5% (preferably 3%)
Titania solution.
Compared with the prior art, technical solution of the present invention has the following beneficial effects:
(1) CTAB (cetyl trimethylammonium bromide) and nano-TiO that the present invention uses2It can produce good collaboration to make
With the presence of CTAB can change nano-TiO2Activity, and the process is irreversible, to guarantee subsequent Flooding Efficiency, makes TiO2It inhales
It is attached to gas-liquid interface, the interfacial viscoelasticity of foam is obviously improved, foam stability is substantially improved；The cation of another aspect CTAB
Characteristic can change nano-TiO2Position, make it be easier to be adsorbed on rock, improve profile control efficiency.
(2) the partial hydrolysis HPAM (partially hydrolyzed polyacrylamide (PHPA)) in the present invention, CTAB and nano-TiO2Mutual association
It is same to play the role of heat-resistant salt-resistant.Since itself Long carbon chain of CTAB can play space steric effect, and HPAM has
Certain cotton-shaped and reticular structure, HPAM and CTAB are wound due to suction-operated, are flocculated, at high temperature (such as 130 DEG C),
HPAM retard motion, is able to maintain higher viscosity, and temperature tolerance is outstanding.Nano-TiO in solution2Repel each other with HPAM charge, makes
The form for obtaining HPAM is more unfolded, and the salt tolerance of system is further improved.
(3) oil displacement system of the invention can be wound floccule body by HPAM in high temperature and high salt environment, the flocculation
Physical efficiency effectively inhibits the defoaming of foam, forms bridging structure, reinforced foam system stability, while TiO in the foam2In gas-liquid
Interfacial Adsorption, which forms Janus structure, can make liquid in foam be maintained, and reduce the drain rate of foam, reduce gas in liquid
Solubility in film, foam stability are enhanced.
(4) transfer drive system of the invention can be suitable for high temperature and high salt oil deposit, the nano-TiO of use2With good resistance to
Temperature, salt tolerant, endurance of cutting energy.
(5) transfer drive system of the invention has good ageing stability, the aging two under the conditions of high temperature (such as 130 DEG C)
After a month, which is still able to maintain stable volume and partial size.
(6) transfer drive system of the invention under the conditions of high temperature (such as 130 DEG C) aging be still able to maintain after two months preferably
Structural strength, can fracture generate it is effective block, can be significant so that subsequent injection pressure is able to maintain in higher level
Improve the swept volume of subsequent fluid.
(7) alkali is not added transfer drive system of the invention, can avoid alkali and adversely affects to stratum bring.
(8) system of the present invention can reach the requirement of extemporaneous preparation, convenient and efficient, and oil extraction methods are simple, by setting
Multiple alternate displacement of reservoir oil slugs are set, the oil displacement efficiency of system can be improved to greatest extent.
Detailed description of the invention
Fig. 1 shows the room temperature form of transfer drive system prepared by embodiment one.
Fig. 2 shows transfer drive system prepared by embodiment one through 130 DEG C of forms after aging 72 hours.
Fig. 3 shows the foam form that room temperature transfer drive system is formed after ten minutes by stirring.
Fig. 4 shows the foam form that the transfer drive system through 130 DEG C after aging 72 hours is formed after ten minutes by stirring.
Fig. 5 shows room temperature transfer drive system by stirring the foam form after room temperature 2 hours after ten minutes.
Fig. 6 shows the transfer drive system through 130 DEG C after aging 72 hours by stirring after ten minutes after room temperature 2 hours
Foam form.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
It is poor for the current most temperature-resistant anti-salt ability of displacement of reservoir oil foam system, it is not applied for high temperature, reservoir with high salt, this
The inventor of invention is a kind of for improving the foam profile system of tertiary oil recovery recovery ratio by having researched and proposed, and it is suitable for items
The more harsh Complex Reservoir of part (temperature is not less than 130 DEG C, and salinity is not less than 220000mg/L), the system is by nano particle
It is introduced into conventional foam profile system, energy high degree changes the interfacial property of foam, can be in high temperature and high salt condition
Under be stabilized and retention property is good.
In a first aspect, by weight percentage including: 1%~3% nano-silica the present invention provides a kind of transfer drive system
Change titanium, 0.2%~0.9% cetyl trimethylammonium bromide, 0.01%~0.3% partially hydrolyzed polyacrylamide (PHPA) and surplus
Water.Preferably, transfer drive system of the invention includes: 1%~2% nano-titanium dioxide by weight percentage, 0.5%~
0.9% cetyl trimethylammonium bromide, the water of 0.01%~0.2% partially hydrolyzed polyacrylamide (PHPA) and surplus.More preferably
Ground, transfer drive system of the invention include: 2% nano-titanium dioxide, 0.9% cetyl trimethyl bromination by weight percentage
Ammonium, the water of 0.1% partially hydrolyzed polyacrylamide (PHPA) and surplus.
In transfer drive system of the invention, nano-titanium dioxide is preferably hydrophily self-dispersing nano-titanium dioxide.It is so-called
Hydrophily self-dispersing nano-titanium dioxide, referring to has big affinity to water, can preferably be dissolved in water.Preferably, it receives
The average grain diameter of rice titanium dioxide is 10nm to 30nm, it is highly preferred that the average grain diameter of nano-titanium dioxide is 30nm.
In transfer drive system of the invention, the average molecular weight of partially hydrolyzed polyacrylamide (PHPA) is 5,000,000 to 12,000,000, water
Xie Du is 5%~20%.Preferably, the average molecular weight of the partially hydrolyzed polyacrylamide (PHPA) is 7,000,000, and degree of hydrolysis is
10%.
In transfer drive system of the invention, water can be using simulation mineralized water, for example, the total salinity of simulation mineralized water is
220000mg/L, wherein Ca2+With Mg2+Ion concentration is 2000mg/L.
Nano-titanium dioxide, cetyl trimethylammonium bromide and the partial hydrolysis poly- third that transfer drive system of the invention includes
Acrylamide can be bought by market and be obtained, and obtain for example, nano-titanium dioxide is bought by Sigam-Aldrich company, ten
Six alkyl trimethyl ammonium bromides are bought by Shanghai Mike woods biochemical technology Co., Ltd and are obtained, and partially hydrolyzed polyacrylamide (PHPA) is by upper
The purchase of Hai Maikelin biochemical technology Co., Ltd obtains.
Second aspect, the present invention provides the preparation methods of above-mentioned transfer drive system, specifically comprise the following steps:
(1) cetyl trimethylammonium bromide is added to the water dissolution and obtains cetyl trimethylammonium bromide solution；
(2) nano-titanium dioxide will be obtained in nano-titanium dioxide addition cetyl trimethylammonium bromide solution uniformly to divide
Scattered mixed solution；
(3) partially hydrolyzed polyacrylamide (PHPA) is added in mixed solution, stirs evenly, obtains transfer drive system.
In a specific embodiment, the preparation method of transfer drive system includes the following steps:
(1) at 25 DEG C, Surfactant CTAB is first added in water, makes surfactant using magnetic stirrer
CTAB sufficiently dissolves, and obtains CTAB aqueous solution；
(2) nano-TiO is added dropwise in CTAB aqueous solution2, it is ultrasonic after stirring, make nano-TiO2It is evenly dispersed in water,
Obtain CTAB and nano-TiO2Aqueous dispersion, referred to as mixed solution；
(3) partial hydrolysis HPAM is added in mixed solution, stirs at low speed solution 12 hours using mechanical agitator；I.e.
It is made suitable for the heat-resistant salt-resistant foam profile system under the conditions of Complex Reservoir.
Preferably, the stirring duration in step (1) and step (2) is 3~5 minutes, and when ultrasound in step (2) is a length of
30 minutes, when stirring in step (3) a length of 12 hours.
The present inventor is based primarily upon following inventive concept when designing transfer drive system of the invention:
Interfacial tension of the surfactant due to that can reduce grease and gas-liquid, has preferable frothing capacity, can make ground
Foam system can be generated under the conditions of layer, and surfactant oil-water interfaces absorption so that oil is easier to be washed from surface of stratum under
Come, the surface of stratum of oleophylic can be made to be reversed to water-wetted surface, improve displacement efficiency；The presence of polymer improves surface-active
Agent can reduce the diffusion rate of surfactant to the thickening of displacement of reservoir oil medium to the mobility ratio of oil, polymer can with calcium, magnesium from
The reaction such as son, protects surfactant；Nano particle will form a kind of special layer structure in the absorption of gas-liquid interface, should
Structure can be reduced liquid film drain and gas diffusion, and the adsorption energy of nano particle largely changes interface rheological behavior, system
The increase meeting of interfacial viscoelasticity is so that foam system stability is enhanced.Surfactant, polymer and nano particle
Cooperation can be played the role of improving displacement efficiency and swept volume.
Foregoing invention design on the basis of, the present inventor further the characteristic to each component, each component and
The proportion of each component optimizes.Specifically, in transfer drive system of the invention, after generating foam, nano-TiO2In gas-liquid circle
Face stablizes absorption and forms Janus structure, which can be reduced liquid film drain, and gas diffusion simultaneously inhibits your moral curing of Oswald existing
As HPAM then generates flocculation by adsorbing one or more foams, on the one hand reinforces the surface elasticity of foam, and it is viscous to improve surface
Degree, the closer arrangement of the molecule on the other hand promoting foam surface to adsorb reduce gas passability, while the flocculent structure meeting
It is formed and is built bridge between foam, to greatly improve foam stability.After transfer drive system enters underground, in the absorption of HPAM
Under the steric effect of effect and surfactant, the retard motion of HPAM at high temperature, therefore viscosity reduction is limited, it can be in high temperature
It is lower to keep higher viscosity.In general, in haline water, since the electrical property of carboxyl is shielded, HPAM strand can be in curling
State, tackifying ability reduce, but in the present invention, due to nano-TiO2Repel each other with HPAM charge, the form of HPAM can be promoted
More unfold, improves the viscosity of transfer drive system, improve the salt tolerance of HPAM.Nano-TiO2In the effect to repel each other with HPAM charge
Under, it is easier to be adsorbed on rock, oil is stripped down from rock, plays the role of displacement of reservoir oil profile control.
Compared with traditional binary or ternary combination flooding, transfer drive system of the invention is had the advantage that used in system
Surfactant, polymer and nano material are industrialization product, cheap and easily-available, and preparing process is simple, time-consuming less.It should
When transfer drive system prepares completion under the conditions of 25 DEG C, system has a small amount of precipitating, and formation condition (for example, 130 DEG C of temperature, mine
Change degree is 220000mg/L) under, a large amount of flocculations can be generated, which can form bridge formation between foam, to substantially mention
Foam stability is risen, due to being fracture-pore reservoir under the conditions of Complex Reservoir, common binary or ternary displacement system can not split greatly
Play good result in seam, and due to the transfer drive system can form a large amount of floccule bodys under the conditions of high temperature and high salt and viscosity will not
Reduce, therefore foam system can not only play oil displacement efficiency in the earth formation, but also because flocculated presence can play it is certain
Profile control effect.
The third aspect, the present invention provides above-mentioned transfer drive systems in the Complex Reservoir (temperature to oil reservoir, especially condition harshness
Degree is not less than 130 DEG C, and salinity is not less than 220000mg/L), carry out the purposes in the displacement of reservoir oil.
Fourth aspect, the present invention provides a kind of displacement of reservoir oil sides for being used for oil reservoir (the especially Complex Reservoir of condition harshness)
Method, comprising: include the principal piece plug of the transfer drive system of first aspect present invention to stratum injection.
Specifically, flooding method of the invention includes:
Step 1: injecting preposition pretreatment section to stratum according to 0.1%~1% that volume injection rate is formation pore volume
Plug；
Step 2: according to 30%~50% that volume injection rate is formation pore volume to stratum injection include the present invention the
The principal piece plug of one side transfer drive system and nitrogen；
Step 3: injecting postposition to stratum according to 0.1%~1% that volume injection rate is formation pore volume and protect slug；
Step 4: closing well.
Preferably, in step 1, preposition pretreatment slug is the cetyl that concentration is 0.1mmol/L~0.5mmol/L
Trimethylammonium bromide solution.
It preferably, in step 2, is 1: 1 to 1: 3 (preferably 1: 2) by transfer drive according to the volume ratio of transfer drive system and nitrogen
System and nitrogen alternately inject stratum.
Preferably, in step 3, postposition protection slug is the nano-silica that mass concentration is 1%~5% (preferably 3%)
Change titanium solution.
In a specific embodiment, flooding method of the invention includes:
Step 1: using concentration is the CTAB aqueous solution of 0.1mmol/L~0.5mmol/L as preposition pretreatment slug, to
Preposition pretreatment slug is injected on stratum, and volume injection rate is the 0.1%~1% of formation pore volume.Pass through preposition pretreatment
Slug can reduce oil saturation, increase the relative permeability difference of oil-water-layer, be conducive to the injection of follow-up work liquid.
Step 2: using first aspect present invention transfer drive system and pure nitrogen gas system as principal piece plug, alternating is infused into stratum
Enter transfer drive system and pure nitrogen gas system that volume ratio is 1: 2, the volume injection rate of principal piece plug be formation pore volume 30%~
50%.By the way that transfer drive system slug is arranged, stable foam can produce, wherein Surfactant CTAB is foaming agent, polymerization
Object HPAM and nano-TiO2It is foam stabilizer, the viscoplasticity of foams phase, nano-TiO can be improved in HPAM2Foam interface can be improved
Foam stability can be substantially improved in viscoplasticity, triangular synergistic effect, can finally greatly improve oil recovery factor.
Step 3: being 3% nano-TiO using mass concentration2Aqueous solution protects slug as postposition, to after the injection of stratum
Protection slug is set, volume injection rate is the 0.1%~1% of formation pore volume.Slug, Ke Yibao are protected by setting postposition
Barrier principal piece plug plays one's part to the full, and prevents main body slug from being broken through near wellbore zone by larger differential pressure action.
Step 4: closing well 5-10 days, driving a well and resume production.
Nano-TiO2Absorption at gas-liquid interface and the flocculation physical efficiency formed under the high temperature conditions promote foam stability,
And foam is made to be able to achieve the closure to high seepage channel in the earth formation, expand the swept volume of subsequent fluid, enhances compound tune
The fluidity control ability of displacement system.The addition of surfactant can reduce gas-liquid interface tension, to form foam system, improve
The temperature tolerance of HPAM, while it can also reduce oil water interfacial tension, be conducive to remaining oil and remove from rock layer surface, improve compound tune
The oil displacement efficiency of displacement system.Nano-TiO2Promote the form of HPAM more to unfold, improve HPAM and calcium and magnesium ion reactivity to
Protect surfactant, HPAM can also improve the stability of foam system, make the sweep efficiency of foam and washing oil ability have compared with
It is big to be promoted.
System of the present invention can reach the requirement of extemporaneous preparation, convenient and efficient, and oil extraction methods are simple, more by being arranged
A alternate displacement of reservoir oil slug, can improve the oil displacement efficiency of system to greatest extent.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions, or according to quotient
The selection of product specification.
Embodiment one
The composition (weight percent) of the transfer drive system of the present embodiment is: partial size is the hydrophilic TiO of 30nm2Particle 2%,
CTAB 0.9%, molecular weight are that the 7000000 and HPAM 0.1% and surplus of degree of hydrolysis 10% be total salinity is 220000mg/L
Simulation mineralized water (wherein Ca2+With Mg2+Ion concentration is 2000mg/L).
The preparation method of the transfer drive system of the present embodiment is:
(1) at 25 DEG C, Surfactant CTAB is first added in the simulation mineralized water that total salinity is 220000mg/L,
Surfactant CTAB was dissolved sufficiently using magnetic stirrer 3~5 minutes, obtained CTAB aqueous solution；
(2) the hydrophilic TiO that partial size is 30nm is added dropwise in CTAB aqueous solution2Particle, stirring 3~surpass after five minutes
Sound 30 minutes, make nano-TiO2It is evenly dispersed in water, obtain CTAB and nano-TiO2Aqueous dispersion, referred to as mixed solution；
(3) partial hydrolysis HPAM is added in mixed solution, stirs at low speed solution 12 hours i.e. using mechanical agitator
The transfer drive system of the present embodiment is made.
The transfer drive system (not yet stirring) being prepared, i.e. room temperature transfer drive system are observed at 25 DEG C of room temperature, such as Fig. 1 institute
Show, transfer drive system precipitates less under 25 DEG C, 220000mg/L.
The transfer drive system solution being prepared is placed in aging 72 in the constant temperature oven for sealing in ampoule bottle and be placed on 130 DEG C
Hour.As shown in Fig. 2, transfer drive system will form a large amount of flocculations after aging 72 hours under the conditions of 130 DEG C, 220000mg/L, and
It flocculates and will not reduce after cooling down again.
Using Waring-Blender high-speed mixing method, with 10000 revs/min of revolving speed respectively to room temperature transfer drive system (nothing
Ageing process) and through 130 DEG C of transfer drive systems after aging 72 hours stir 10 minutes, it is small then at 25 DEG C of room temperature to place 2 respectively
When.
Fig. 3 shows the foam form that room temperature transfer drive system is formed after ten minutes by stirring.Fig. 4 is shown through 130 DEG C
The foam form that transfer drive system after aging 72 hours is formed after ten minutes by stirring.
Fig. 5 shows room temperature transfer drive system by stirring the foam form after room temperature 2 hours after ten minutes.Fig. 6 is aobvious
Show the transfer drive system through 130 DEG C after aging 72 hours by stirring the foam form after room temperature 2 hours after ten minutes.
It can be seen that the foam that the compound system solution after aging is formed has better stability.Compounding after aging
More foams can be formed after system solution stirring, and foam is finer and close, it is many slowly that foam defoams speed ratio room temperature system.
Embodiment two
The composition (weight percent) of the transfer drive system of the present embodiment is: partial size is the hydrophilic TiO of 30nm2Particle 1%,
CTAB 0.5%, molecular weight are that the 7000000 and HPAM 0.2% and surplus of degree of hydrolysis 10% be total salinity is 220000mg/L
Simulation mineralized water (wherein Ca2+With Mg2+Ion concentration is 2000mg/L).
The preparation method of the transfer drive system of the present embodiment is:
(1) at 25 DEG C, Surfactant CTAB is first added in the simulation mineralized water that total salinity is 220000mg/L,
Surfactant CTAB was dissolved sufficiently using magnetic stirrer 3~5 minutes, obtained CTAB aqueous solution；
(2) the hydrophilic TiO that partial size is 30nm is added dropwise in CTAB aqueous solution2Particle, stirring 3~surpass after five minutes
Sound 30 minutes, make nano-TiO2It is evenly dispersed in water, obtain CTAB and nano-TiO2Aqueous dispersion, referred to as mixed solution；
(3) partial hydrolysis HPAM is added in mixed solution, stirs at low speed solution 12 hours i.e. using mechanical agitator
The transfer drive system of the present embodiment is made.
Embodiment three
The composition (weight percent) of the transfer drive system of the present embodiment is: partial size is the hydrophilic TiO of 10nm2Particle 3%,
CTAB 0.2%, molecular weight are that the 10000000 and HPAM 0.3% and surplus of degree of hydrolysis 15% be total salinity is 220000mg/L
Simulation mineralized water (wherein Ca2+With Mg2+Ion concentration is 2000mg/L).
The preparation method of the transfer drive system of the present embodiment is the same as example 1.
Example IV
The composition (weight percent) of the transfer drive system of the present embodiment is: partial size is the hydrophilic TiO of 20nm2Particle 2%,
CTAB 0.8%, molecular weight are that the 5000000 and HPAM 0.1% and surplus of degree of hydrolysis 5% be total salinity is 220000mg/L
Simulate mineralized water (wherein Ca2+With Mg2+Ion concentration is 2000mg/L).
The preparation method of the transfer drive system of the present embodiment is the same as example 1.
Embodiment five
The composition (weight percent) of the transfer drive system of the present embodiment is: partial size is the hydrophilic TiO of 30nm2Particle 2%,
CTAB 0.5%, molecular weight are that the 12000000 and HPAM 0.2% and surplus of degree of hydrolysis 20% be total salinity is 220000mg/L
Simulation mineralized water (wherein Ca2+With Mg2+Ion concentration is 2000mg/L).
The preparation method of the transfer drive system of the present embodiment is the same as example 1.
Embodiment six: imitation oil displacement experiment experiment
The present embodiment carries out the displacement of reservoir oil using transfer drive system prepared by embodiment one.Being directed to permeability is 2.3 μm2People
The lithogenesis heart (length 8.5cm, diameter 2.5cm, pore volume are about 13.65mL).The artificial core is contained by Beijing Orient intelligence
Petroleum Technology Co., Ltd's purchase obtains.
The flooding method of the present embodiment is:
It is 2.3 μm by permeability in 130 DEG C of constant temperature oven2Artificial core (length 8.5cm, diameter are
2.5cm, pore volume are about 13.65mL) it vacuumizes, saturated water, saturated oils, after water drive to moisture content is 96%, according to following
Three slugs carry out the displacement of reservoir oil of compound displacement system: preposition pretreatment slug, principal piece plug and postposition protect slug.Compound displacement body
Be the displacement of reservoir oil concrete operations it is as follows:
(1) preposition pretreatment slug: preposition pretreatment slug is CTAB aqueous solution, and the mass fraction of CTAB is in aqueous solution
0.3mmol/L, volume injection rate are the 0.1% of rock pore volume；
(2) principal piece plug: in principal piece plug compound displacement system be embodiment one prepare transfer drive system, the transfer drive system with it is pure
For the ratio that nitrogen is 1: 2 according to volume ratio by injecting in rock core after foam maker, total volume injection rate is rock core hole
The 50% of volume；
(3) postposition protects slug: it is nano-TiO that postposition, which protects slug,2Aqueous solution, nano-TiO in aqueous solution2Quality
Score is 3%, and volume injection rate is the 1% of rock pore volume；
After the completion of above three step, by rock core aging 5 days under the conditions of 130 DEG C, water drive to moisture content reaches again
98%.After transfer drive system prepared by injection embodiment one, subsequent waterflooding staged pressure obviously rises, in 2 times of pore-bodies of water drive
Reach maximum value 80kPa after product, and remain at 80kPa after 5 times of pore volumes of water drive, there is stronger fluidity control energy
Power significantly improves recovery ratio increment up to 32.36%.
Embodiment seven: imitation oil displacement experiment experiment
According to the flooding method of embodiment six, it is real that the transfer drive system that embodiment two is respectively adopted to embodiment five carries out the displacement of reservoir oil
It tests, improving recovery ratio is respectively: 28.31%, 25.45%, 27.63%, 25.12%.
The present invention is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that, these
Embodiment is only used for describing the present invention, but should not be understood as limiting the scope of the invention.It should be noted that all implement with these
Example equivalent variation and displacement, should all be set as being covered by scope of the presently claimed invention.Therefore, protection scope of the present invention
It should be subject to range defined in claims.
Claims (13)
1. a kind of transfer drive system, which is characterized in that it by weight percentage include: 1%~3% nano-titanium dioxide, 0.2%~
0.9% cetyl trimethylammonium bromide, the water of 0.01%~0.3% partially hydrolyzed polyacrylamide (PHPA) and surplus.
2. transfer drive system according to claim 1, which is characterized in that by weight percentage include: 1%~2% nanometer
Titanium dioxide, 0.5%~0.9% cetyl trimethylammonium bromide, 0.01%~0.2% partially hydrolyzed polyacrylamide (PHPA), and
The water of surplus；
It preferably, by weight percentage include: 2% nano-titanium dioxide, 0.9% cetyl trimethylammonium bromide, 0.1%
The water of partially hydrolyzed polyacrylamide (PHPA) and surplus.
3. transfer drive system according to claim 1 or 2, which is characterized in that the nano-titanium dioxide is that hydrophily is divided certainly
Dissipate nano-titanium dioxide.
4. transfer drive system according to claim 1 or 2, which is characterized in that the average grain diameter of the nano-titanium dioxide is
10~30nm, preferably 30nm.
5. transfer drive system according to claim 1 or 2, which is characterized in that the molecule of the partially hydrolyzed polyacrylamide (PHPA)
Amount is 500~12,000,000, and degree of hydrolysis is 5%~20%；Preferably, the molecular weight of the partially hydrolyzed polyacrylamide (PHPA) is 700
Ten thousand, degree of hydrolysis is 10%.
6. transfer drive system according to claim 1 or 2, which is characterized in that the water is simulation mineralized water.
7. the preparation method of transfer drive system as claimed in any one of claims 1 to 6 characterized by comprising
(1) cetyl trimethylammonium bromide is added to the water dissolution and obtains cetyl trimethylammonium bromide solution；
(2) nano-titanium dioxide is added and obtains nano-titanium dioxide in the cetyl trimethylammonium bromide solution and uniformly divides
Scattered mixed solution；
(3) partially hydrolyzed polyacrylamide (PHPA) is added in the mixed solution, is stirred evenly, obtain the transfer drive system.
8. transfer drive system as claimed in any one of claims 1 to 6 is carrying out the purposes in the displacement of reservoir oil to oil reservoir.
9. a kind of flooding method for oil reservoir characterized by comprising include any one of claim 1 to 6 to stratum injection
The principal piece plug of the transfer drive system.
10. flooding method according to claim 9 characterized by comprising
Step 1: injecting preposition pretreatment slug to stratum according to 0.1%~1% that volume injection rate is formation pore volume；
Step 2: including the transfer drive system to stratum injection according to 30%~50% that volume injection rate is formation pore volume
With the principal piece plug of nitrogen；
Step 3: injecting postposition to stratum according to 0.1%~1% that volume injection rate is formation pore volume and protect slug；
Step 4: closing well.
11. flooding method according to claim 10, which is characterized in that in step 1, the preposition pretreatment slug is
Concentration is the cetyl trimethylammonium bromide solution of 0.1mmol/L~0.5mmol/L.
12. flooding method according to claim 10, which is characterized in that in step 2, according to the transfer drive system and nitrogen
The volume ratio of gas is 1: 1 to 1: 3 (preferably 1: 2) by the transfer drive system and nitrogen alternately injection stratum.
13. flooding method according to claim 10, which is characterized in that in step 3, the postposition protection slug is matter
Measure the nanometer titanium dioxide titanium solution that concentration is 1%~5% (preferably 3%).
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