CN109337663A - Low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application - Google Patents
Low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application Download PDFInfo
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- CN109337663A CN109337663A CN201811376524.5A CN201811376524A CN109337663A CN 109337663 A CN109337663 A CN 109337663A CN 201811376524 A CN201811376524 A CN 201811376524A CN 109337663 A CN109337663 A CN 109337663A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
- C09K8/604—Polymeric surfactants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/30—Viscoelastic surfactants [VES]
Abstract
The present invention relates to a kind of low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application, which presses following mass percentage composition by following component: thickening agent is 3~9%；Gel breaker is 1~2%；Surplus is water.Thickening agent presses following mass percentage composition by following component: viscoelastic surfactant is 3~8%；Efficient oil displacement surfactant is 12~20%；Salt is 5~10%；Surplus is water.The thickening agent is met water viscosity and is greatly improved, and frozen glue can be formed.After the fracturing fluid injects stratum, discharge fracturing fluid can not be returned, the fracturing fluid on indwelling stratum meets the broken glue of oil and generates fracturing liquid rubber-breaking liquid, breaking glue solution has the ability for reducing oil water interfacial tension and weakening core surface lipophilicity and improves the crude oil imbibition recovery percent of reserves of reservoir in low-permeability oilfields, there is preferable cleaning, removing, displacement effect to crude oil, it realizes " oil and water displacement " that there is oil displacement efficiency, and improves effect of increasing production after pressure.
Description
Technical field
The invention belongs to oil-gas field development technical fields, and in particular to have oil-displacement capacity in one kind of low permeability reservoir
Low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application.
Background technique
Fracturing technique is general in Changqing oilfields and numerous domestic oil field as the key technology of low permeability reservoir Efficient Development
And application, meet the demand of oilfield stimulation transformation.Since reservoir in low-permeability oilfields physical property, fracturing technology, the row's of returning system etc. are more
The combined influence of factor causes fracturing fluid recovery (backflow) difficult, and the row of returning leads low.A large amount of fracturing fluids are trapped in microcrack and matrix hole simultaneously
In gap, cause reservoir damage serious, reduces correctional effect after low-permeability oil deposit pressure.In view of the above-mentioned problems, develop it is a kind of can be into
The New Fracturing Fluid that one step improves reservoir oil recovery factor becomes the important directions of fracturing fluid development.
Summary of the invention
An object of the present invention is to provide a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, is able to achieve pressure break
Join with the displacement of reservoir oil and make, improves effect of increasing production after pressure.
The second object of the present invention is to provide the low permeability reservoir preparation method of continuous mixed displacement of reservoir oil type fracturing fluid.
The third object of the present invention is to be to provide the low permeability reservoir application of continuous mixed displacement of reservoir oil type fracturing fluid.
The technical scheme is that a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, is pressed by following component
Following mass percentage composition: thickening agent is 3~9%；Gel breaker is 1~2%；Surplus is water.
The thickening agent presses following mass percentage composition by following component: viscoelastic surfactant is 3~8%；It is high
Imitating oil displacement surfactant is 12~20%；Salt is 5~10%；Surplus is water.
The gel breaker is one of kerosene, diesel oil, crude oil.
The viscoelastic surfactant is mixed by following component by following mass percent: trimethylene base bis- (ten
Eight alkyl dimethyl ammonium bromides) it be 30~60%, ethylene group bis- (octadecyl dihydroxy ethyl ammonium chlorides) is 30~50%, erucic acid acyl
One or more in amine diemethylamine, oleamide is 10~20%.
The efficient oil displacement surfactant is mixed by following component by following mass percent: dimethylene-
1,2- bis- (Dodecydimethylammonium bronides) are, lauryl amine polyoxyethylene ether bi-quaternary ammonium salt is 20~50%, dodecyl
One of sodium sulphate, super high molecular weight polyacrylamide or it is a variety of be 20%；Wherein, the ultrahigh molecular weight polypropylene acyl
The molecular weight of amine is 5,000,000-1,500 ten thousand.
The salt is 20~50% inorganic salts by mass percent and mass percent is that 50~80% organic salts form,
Wherein, inorganic salts are one of potassium chloride, sodium chloride, ammonium chloride or a variety of, and organic salt is sodium citrate, sodium acetate, formic acid
One of potassium is a variety of.
A kind of low permeability reservoir is pressed under normal temperature conditions with the preparation method of continuous mixed displacement of reservoir oil type fracturing fluid
Thickening agent and gel breaker are directly added into water by formula ratio, are quickly stirred 2~5min and are driven to get the continuous mixture of low permeability reservoir
Oil type fracturing fluid.
The low permeability reservoir is with continuously mixed displacement of reservoir oil type fracturing fluid is when temperature is 75 DEG C, shear rate 170s-1
Under the conditions of continuous shear stress 60 minutes, fracturing fluid viscosity is able to maintain more than 27mPa s.
A kind of application of the continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, which uses continuous mixed
With displacement of reservoir oil type fracturing fluid in the oil wells in field construction for exploiting reservoir hydrocarbons, it meets in-place oil can break glue automatically, and viscosity is big
In 5mPa s, without additional addition gel breaker, continuous mixture is can be realized in scene.
The low permeability reservoir directly carries out fracturing reform to reservoir with continuous mixed displacement of reservoir oil type fracturing fluid, without the row of returning,
Breaking glue solution after the low permeability reservoir is directly used continuous mixed displacement of reservoir oil type fracturing liquid rubber-breaking drives reservoir as oil displacement agent
Oil.
Beneficial effects of the present invention:
Contain viscoelastic surfactant in thickening agent component in displacement of reservoir oil fracturing fluid of the present invention, such surfactant point
Contain hydrophilic group and hydrophobic group in minor structure simultaneously, have positive and negative charge end simultaneously on strand, reach certain ionic strength and
Counter ion concentration, and surfactant solution concentration be greater than critical micelle concentration when, hydrophobic hydrocarbon chain can associate, formed
Vermiculate glues, these micellas usually have the variforms such as rodlike, linear, and the micella of various states is reversible by being wound
Network-like structure has viscoelastic effect and high effective viscosity, and becoming has viscoelastic micelle gels.In pressing crack construction process
The memory fluid can play the role of seam and take sand, will can be mixed according to the ratio in above-mentioned displacement of reservoir oil type fracturing fluid equal
It is even, and after proppant needed for addition, inject stratum.I.e. the thickening agent is met water viscosity and is greatly improved, and can form frozen glue, is not necessarily to it
His process, fully achieves continuous mixture.
Contain efficient oil displacement surfactant in displacement of reservoir oil fracturing fluid of the present invention in thickening agent component, such surface is living
Property agent not only have reduce oil water interfacial tension and make core surface lipophilicity weaken ability, can also effectively improve low-permeability oil
The crude oil imbibition recovery percent of reserves of field reservoir.In porous media, wetting phase fluid replaces non-wetted phase stream by capillary force effect
The process of body is known as imbibition.By both at home and abroad to imbibition mechanism the study found that compact reservoir there are two kinds of seepage flow mechanisms: displacement and
Spontaneous imbibition, with the reduction of permeability, displacement declines, spontaneous imbibition enhancing.
After pressure break, the hydrophobic group of surfactant plays the role of solubilising in the displacement of reservoir oil type fracturing fluid, and fracturing fluid enters
Behind stratum, the organic hydrocarbons such as crude oil, natural gas in stratum are dissolved into vermiculate glues by the solubilization of hydrophobic group, are made compacted
Fracture, separation occur for worm shape micella, become pellet shapes micella, that is, form the very low fracturing liquid rubber-breaking liquid of viscosity.
Contain a large amount of unimolecule surfactants in the breaking glue solution of displacement of reservoir oil type fracturing fluid of the present invention, is attached to fracture spaces
With crack core surface, these stagnant liquids have certain surface-active, and the spontaneous imbibition in compact reservoir, which acts on, to be mentioned
Height, after the load fluid of above-mentioned fracturing fluid is injected stratum, can not the row's of returning fracturing fluid of the invention, in ground environment condition
Under, the fracturing fluid on indwelling stratum meets the broken glue of oil and generates fracturing liquid rubber-breaking liquid, breaking glue solution can fracture cyberspace, fracture faces and
The crude oil in nearly fracture matrix area has preferable cleaning, removing, displacement effect, to realize " oil and water displacement ", has the displacement of reservoir oil
Effect realizes that pressure break and displacement of reservoir oil connection are made simultaneously, improves effect of increasing production after pressure.
Continuous mixed displacement of reservoir oil fracturing fluid of the present invention, which meets oil, can break glue, not need additionally to add gel breaker to increase
Process, while the breaking glue solution does not need to carry out the row of returning yet, realizing the displacement of reservoir oil type fracturing fluid and can not only be used for fracturing fluid can make again
Pressure break breaking glue solution forms oil displacement agent.Suitable for the transformation to low permeability reservoir.
Detailed description of the invention
Fig. 1 is the heatproof endurance of cutting for the continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir that embodiment 1 is prepared
It can test result figure；
Fig. 2 is the oil displacement efficiency of the breaking glue solution for the continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir that embodiment 2 is prepared
Figure；
Fig. 3 is the spontaneous imbibition test result for the continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir that embodiment 3 is prepared
Figure；
Fig. 4 is that the low permeability reservoir that embodiment 4 is prepared is surveyed with the temperature and shearing sustainability of continuous mixed displacement of reservoir oil type fracturing fluid
Test result figure.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now in conjunction with specific example
Technical solution of the present invention is carried out described further below, it should be understood that these examples are merely to illustrate the present invention rather than limitation
The scope of the present invention.
Embodiment 1
A kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, presses following mass percentage composition by following component: thickening
Agent: 3%；Gel breaker: 1~2%；Surplus is water.
The thickening agent presses following mass percentage composition: viscoelastic surfactant: 3~8% by following component；It is high
Effect oil displacement surfactant: 12~20%；Salt: 5~10%；Surplus is water.
Wherein, the viscoelastic surfactant is mixed by following component by following mass percent: 60% the third
Support group is bis- (octadecyldimethyl ammonium bromide), and 30% ethylene group is bis- (octadecyl dihydroxy ethyl ammonium chloride), 10% erucyl amide
Diemethylamine；
The efficient oil displacement surfactant is mixed by following component by following mass percent: 30% dimethylene -1,
2- bis- (Dodecydimethylammonium bronides), 50% lauryl amine polyoxyethylene ether bi-quaternary ammonium salt, 20% lauryl sodium sulfate；
The salt is made of inorganic salts and organic salt, wherein inorganic salts are potassium chloride and sodium chloride, and organic salt is citric acid
Sodium.By following mass percentage composition: 40% potassium chloride, 10% sodium chloride, 50% sodium citrate.
The gel breaker is one of kerosene, diesel oil, crude oil.
A kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir the preparation method comprises the following steps:
Under normal temperature conditions, corresponding viscoelastic surfactant is prepared first, in accordance with each component ratio, efficient oil-displacement surface is lived
Property agent and salt；Secondly, by 3~8% viscoelastic surfactants, 12~20% efficient oil displacement surfactants and 5~10% salts
It is added in the water of thickening agent formula ratio, forms thickening agent after stirring 30min；Finally by the continuous mixed displacement of reservoir oil type of low permeability reservoir
3% thickening agent is added in the formula ratio of fracturing fluid in the water of formula ratio, and 1~2% gel breaker quickly stirs 2~5min, can shape
At the continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir.
Crush properties test is carried out with continuous mixed displacement of reservoir oil type fracturing fluid to the low permeability reservoir that embodiment 1 is prepared:
Using the heatproof endurance of cutting of the continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir of RS6000 rheometer test the present embodiment
Can, test temperature is 75 DEG C, shear rate 170s-1Under the conditions of shear 60 minutes, (η indicates viscous in figure in figure by result such as Fig. 1
Degree) shown in.As can be seen from Figure 1 the continuous mixed displacement of reservoir oil type fracturing fluid viscosity of the low permeability reservoir that embodiment 1 is prepared
It is able to maintain more than 27mPa s, there is preferable temperature and shearing sustainability.
Embodiment 2
A kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, presses following mass percentage composition by following component: thickening
Agent: 5%；Gel breaker: 1~2%；The water of surplus.
The thickening agent presses following mass percentage composition: viscoelastic surfactant: 3~8% by following component；It is high
Effect oil displacement surfactant: 12~20%；Salt: 5~10%；Surplus is water.
Wherein, the viscoelastic surfactant is mixed by following component by following mass percent: 50% trimethylene
Base is bis- (octadecyldimethyl ammonium bromide), and 30% ethylene group is bis- (octadecyl dihydroxy ethyl ammonium chloride), 10% erucyl amide third
Base dimethylamine, the mixing of 10% oleamide；
The efficient oil displacement surfactant is mixed by following component by following mass percent: 40% dimethylene -1,
2- bis- (Dodecydimethylammonium bronides), 40% lauryl amine polyoxyethylene ether bi-quaternary ammonium salt, 20% lauryl sodium sulfate；
The salt is made of inorganic salts and organic salt, wherein inorganic salts are potassium chloride, and organic salt is sodium citrate and acetic acid
Sodium.By following mass percentage composition: 30% potassium chloride, 40% sodium citrate, 30% sodium acetate.
The gel breaker is one of kerosene, diesel oil, crude oil.
The low permeability reservoir is with the preparation method of continuous mixed displacement of reservoir oil type fracturing fluid with same as Example 1.
Flood pot test, specific experiment side are carried out with continuous mixed displacement of reservoir oil type fracturing fluid to low permeability reservoir in embodiment 2
Method is as follows:
(1) rock core is first subjected to saturated process (oil-containing water distribution under simulation stratum condition) with water, oil respectively；
(2) water drive replaces saturated core, calculates water drive oil recovery percent of reserves；
(3) displacement of reservoir oil fracturing liquid rubber-breaking liquid displacement calculates recovery percent of reserves；
Such as Fig. 2, figure it is seen that be added water drive of the low permeability reservoir after continuous mixed displacement of reservoir oil type fracturing fluid be different from it is normal
The water drive of rule, the crude oil that injection low permeability reservoir can further inside displacement rock core with continuous mixed displacement of reservoir oil type fracturing fluid, than general
Water flowing has more surface-active, conventional waterflood recovery efficiency factor 54.7% is increased to 67.2%, the amplification of waterflood recovery efficiency factor is
12.5 % have the effect of the significant displacement of reservoir oil.
Embodiment 3
A kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, presses following mass percentage composition by following component: thickening
Agent: 7%；Gel breaker: 1~2%；The water of surplus.
The thickening agent presses following mass percentage composition: viscoelastic surfactant: 3~8% by following component；It is high
Effect oil displacement surfactant: 12~20%；Salt: 5~10%；Surplus is water.
Wherein, the viscoelastic surfactant is mixed by following component by following mass percent: 40% the third
Support group is bis- (octadecyldimethyl ammonium bromide), and 40% ethylene group is bis- (octadecyl dihydroxy ethyl ammonium chloride), 10% erucyl amide
Diemethylamine, the mixing of 10% oleamide；
The efficient oil displacement surfactant is mixed by following component by following mass percent: 50% dimethylene -1,
2- bis- (Dodecydimethylammonium bronides), 30% lauryl amine polyoxyethylene ether bi-quaternary ammonium salt, 10% lauryl sodium sulfate,
The mixing of 10% super high molecular weight polyacrylamide；Wherein, the molecular weight of the super high molecular weight polyacrylamide is 5,000,000-
15000000.
The salt is made of inorganic salts and organic salt, wherein inorganic salts are ammonium chloride, organic salt be sodium citrate and
Potassium formate.By following mass percentage composition: 20% ammonium chloride, 50% sodium citrate, 30% potassium formate.
The gel breaker is one of kerosene, diesel oil, crude oil.
The low permeability reservoir is with the preparation method of continuous mixed displacement of reservoir oil type fracturing fluid with same as Example 1.
Glue is carried out brokenly with continuous mixed displacement of reservoir oil type fracturing fluid to low permeability reservoir in embodiment 3 and is prepared into breaking glue solution, to broken
Glue, oil displacement agent, simulated formation water carry out spontaneous imbibition evaluation experimental, and specific experimental method is as follows:
(1) first rock core is carried out saturated process (oil-containing water distribution under simulation stratum condition) with water, oil respectively, it is spare after drying；
(2) rock core after aging is placed in volumetric method imbibition instrument, water flooding is added, observes and records；
(3) experiment stops, and calculates spontaneous imbibition recovery ratio；
Such as Fig. 3, as can be seen from Figure 3 when the permeability of rock core may each be about K=1.5mD, be added oil displacement agent (3000mg/L) and
The recovery of core of breaking glue solution is 32% or so；When the permeability of rock core may each be about K=0.6mD, oil displacement agent is added
The recovery of core of (3000mg/L) and breaking glue solution is 10% or so；And the recovery of core of simulated formation water is added 7%
Left and right.Therefore breaking glue solution is suitable with the oil displacement efficiency of oil displacement agent, is used in reservoir in low-permeability oilfields using the low permeability reservoir
Continuous mixture displacement of reservoir oil type fracturing fluid, has the effect of the significant displacement of reservoir oil.
Embodiment 4
A kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, presses following mass percentage composition by following component: thickening
Agent: 9%；Gel breaker: 1~2%；The water of surplus.
The thickening agent presses following mass percentage composition: viscoelastic surfactant: 3~8% by following component；It is high
Effect oil displacement surfactant: 12~20%；Salt: 5~10%；Surplus is water.
Wherein, the viscoelastic surfactant is mixed by following component by following mass percent: 30% trimethylene
Base is bis- (octadecyldimethyl ammonium bromide), and 50% ethylene group is bis- (octadecyl dihydroxy ethyl ammonium chloride), 20% erucyl amide third
The mixing of base dimethylamine；
The efficient oil displacement surfactant is mixed by following component by following mass percent: 60% dimethylene -1,
2- bis- (Dodecydimethylammonium bronides), 20% lauryl amine polyoxyethylene ether bi-quaternary ammonium salt, 20% lauryl sodium sulfate
Mixing；
The salt is made of inorganic salts and organic salt, wherein inorganic salts are sodium chloride, and organic salt is sodium citrate.By with
Lower mass percentage composition: 50% sodium chloride, 50% sodium citrate.
The gel breaker is one of kerosene, diesel oil, crude oil.
The continuous mixed displacement of reservoir oil type fracturing fluid of the low permeability reservoir the preparation method comprises the following steps:
Under normal temperature condition (temperature is 25 degree), corresponding viscoelastic surfactant, height are prepared first, in accordance with each component ratio
Imitate oil displacement surfactant and salt；Secondly, by 3~8% viscoelastic surfactants, 12~20% efficient oil displacement surfactants
It is added with 5~10% salts in the water of thickening agent formula ratio, forms thickening agent after stirring 30min；Finally connect by low permeability reservoir
The formula ratio of continuous mixture displacement of reservoir oil type fracturing fluid, is added 9% thickening agent, 1~2% gel breaker quickly stirs 2 in the water of formula ratio
~5min can form low permeability reservoir with continuous mixed displacement of reservoir oil type fracturing fluid.
Crush properties test is carried out with continuous mixed displacement of reservoir oil type fracturing fluid to the low permeability reservoir that embodiment 4 is prepared:
Using the temperature and shearing sustainability of the displacement of reservoir oil type fracturing fluid of RS6000 rheometer test the present embodiment, test temperature is 75 DEG C, is cut
Cutting speed rate is 170s-1Under the conditions of shear 60 minutes, result is such as shown in Fig. 4 (in figure η indicate viscosity).As can be seen from Figure 4
The low permeability reservoir that embodiment 4 is prepared is able to maintain more than 37mPa s with continuous mixed displacement of reservoir oil type fracturing fluid viscosity, is had
Preferable temperature and shearing sustainability.
Embodiment 5
2 system of embodiment prolongs 9 oil reservoir X wells in yellow 168 blocks in Ji's plateau oil field and carries out field test, and site operation is smooth, without any
It is abnormal live.Produce liquid 2.32m before measure daily3, water content 100%, 3.39 tons of oil-producing of current individual well day, water content are after measure
75.6%, illustrate the low permeability reservoir with continuous mixed displacement of reservoir oil type fracturing fluid obvious effect of increasing production.
Low permeability reservoir of the invention is with continuous mixed displacement of reservoir oil type fracturing fluid in the application for exploiting reservoir hydrocarbons: oil wells in field
When construction, it meets in-place oil can break glue automatically, and viscosity is greater than 5mPa s, and without additional addition gel breaker, scene can be real
Now continuous mixture.
The low permeability reservoir directly carries out fracturing reform to reservoir with continuous mixed displacement of reservoir oil type fracturing fluid, without the row of returning,
Breaking glue solution after the low permeability reservoir is directly used continuous mixed displacement of reservoir oil type fracturing liquid rubber-breaking drives reservoir as oil displacement agent
Oil.
In conclusion not only having same the present invention provides a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir
The thickening sand carrying effect of sample, and breaking glue solution has the apparent work for reducing oil water interfacial tension than conventional fracturing liquid rubber-breaking liquid
With low interfacial tension is conducive to crude oil output；Meanwhile the fracturing fluid has good wettability reversal performance, to being adsorbed on not
Crude oil in smooth hole wall surface has preferable cleaning, removing, displacement effect, realizes that pressure break and displacement of reservoir oil connection are made, thus
Effect of increasing production after pressing is improved, oil recovery factor is improved.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.Reagent according to the present invention can be with
It buys from the market.
Claims (10)
1. a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir, it is characterised in that: press following quality hundred by following component
Divide than composition: thickening agent is 3~9%；Gel breaker is 1~2%；Surplus is water.
2. a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir according to claim 1, it is characterised in that: described
Thickening agent by following component press following mass percentage composition: viscoelastic surfactant be 3~8%；Efficient oil-displacement surface is living
Property agent be 12~20%；Salt is 5~10%；Surplus is water.
3. a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir according to claim 1, it is characterised in that: described
Gel breaker be one of kerosene, diesel oil, crude oil.
4. a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir according to claim 2, it is characterised in that: described
Viscoelastic surfactant mixed by following component by following mass percent: the bis- (octadecyldimethyls of trimethylene base
Ammonium bromide) it be 30~60%, ethylene group bis- (octadecyl dihydroxy ethyl ammonium chlorides) is 30~50%, erucyl amide dimethylamine
One or more in amine, oleamide is 10~20%.
5. a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir according to claim 2, it is characterised in that: described
Efficient oil displacement surfactant mixed by following component by following mass percent: the bis- (dodecanes of dimethylene -1,2-
Base ditallowdimethyl ammonium bromide) be, lauryl amine polyoxyethylene ether bi-quaternary ammonium salt is 20~50%, lauryl sodium sulfate, superelevation point
One of sub- weight polyacrylamide or it is a variety of be 20%；Wherein, the molecular weight of the super high molecular weight polyacrylamide is
5000000-1,500 ten thousand.
6. a kind of continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir according to claim 2, it is characterised in that: described
Salt be 20~50% inorganic salts by mass percent and mass percent is that 50~80% organic salts form, wherein inorganic salts
For one of potassium chloride, sodium chloride, ammonium chloride or a variety of, organic salt be one of sodium citrate, sodium acetate, potassium formate or
It is a variety of.
7. a kind of low permeability reservoir according to claim 1 preparation method of continuous mixed displacement of reservoir oil type fracturing fluid, special
Sign is: under normal temperature conditions, thickening agent and gel breaker are directly added into water by formula ratio, quickly stir 2~5min to get
The continuous mixed displacement of reservoir oil type fracturing fluid of low permeability reservoir.
8. a kind of low permeability reservoir according to claim 1 preparation method of continuous mixed displacement of reservoir oil type fracturing fluid, special
Sign is: the low permeability reservoir is with continuously mixed displacement of reservoir oil type fracturing fluid is when temperature is 75 DEG C, shear rate 170s-1Under the conditions of
Continuous shear stress 60 minutes, fracturing fluid viscosity was able to maintain more than 27mPa s.
9. a kind of low permeability reservoir answering with continuous mixed displacement of reservoir oil type fracturing fluid according to claim 1 to 6
With, it is characterised in that: the low permeability reservoir is constructed with continuous mixed displacement of reservoir oil type fracturing fluid in the oil wells in field of exploitation reservoir hydrocarbons
When, it meets in-place oil can break glue automatically, and viscosity is greater than 5mPa s, and without additional addition gel breaker, company is can be realized in scene
Continuous mixture.
10. a kind of low permeability reservoir according to claim 9 application of continuous mixed displacement of reservoir oil type fracturing fluid, feature
Be: the low permeability reservoir directly carries out fracturing reform to reservoir with continuous mixed displacement of reservoir oil type fracturing fluid, without the row of returning, directly
Breaking glue solution after the low permeability reservoir is used continuous mixed displacement of reservoir oil type fracturing liquid rubber-breaking carries out the displacement of reservoir oil to reservoir as oil displacement agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811376524.5A CN109337663A (en) | 2018-11-19 | 2018-11-19 | Low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application |
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| CN201811376524.5A CN109337663A (en) | 2018-11-19 | 2018-11-19 | Low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application |
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| CN110630238A (en) * | 2019-11-14 | 2019-12-31 | 西安石油大学 | Fracturing-oil displacement integrated yield increasing method for oil field |
| CN110791277A (en) * | 2019-11-14 | 2020-02-14 | 西安石油大学 | Fracturing fluid capable of being converted into oil displacement agent without flowback for oil field and preparation method thereof |
| CN110819333A (en) * | 2019-11-19 | 2020-02-21 | 西安石油大学 | Intelligent oil displacement agent capable of automatically finding oil and preparation method thereof |
| CN111088017A (en) * | 2020-01-03 | 2020-05-01 | 中国石油化工股份有限公司 | Multi-effect oil displacement system based on oligomerization agent and application thereof |
| CN111636921A (en) * | 2020-05-29 | 2020-09-08 | 中国石油大学(华东) | Method for storing crude oil by using low-permeability and ultra-low-permeability stratum |
| CN112961663A (en) * | 2021-02-07 | 2021-06-15 | 中国石油天然气股份有限公司 | Oil displacement type fracturing fluid system and preparation method thereof |
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| CN116836071A (en) * | 2023-07-03 | 2023-10-03 | 广州市米粒科技信息有限公司 | Moisturizing surfactant, preparation method and moisturizing skin care liquid |
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| CN110630238A (en) * | 2019-11-14 | 2019-12-31 | 西安石油大学 | Fracturing-oil displacement integrated yield increasing method for oil field |
| CN110791277A (en) * | 2019-11-14 | 2020-02-14 | 西安石油大学 | Fracturing fluid capable of being converted into oil displacement agent without flowback for oil field and preparation method thereof |
| CN110819333A (en) * | 2019-11-19 | 2020-02-21 | 西安石油大学 | Intelligent oil displacement agent capable of automatically finding oil and preparation method thereof |
| CN110819333B (en) * | 2019-11-19 | 2021-09-03 | 西安石油大学 | Intelligent oil displacement agent capable of automatically finding oil and preparation method thereof |
| CN111088017A (en) * | 2020-01-03 | 2020-05-01 | 中国石油化工股份有限公司 | Multi-effect oil displacement system based on oligomerization agent and application thereof |
| CN111088017B (en) * | 2020-01-03 | 2022-01-11 | 中国石油化工股份有限公司 | Multi-effect oil displacement system based on oligomerization agent and application thereof |
| CN111636921A (en) * | 2020-05-29 | 2020-09-08 | 中国石油大学(华东) | Method for storing crude oil by using low-permeability and ultra-low-permeability stratum |
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| CN112961663A (en) * | 2021-02-07 | 2021-06-15 | 中国石油天然气股份有限公司 | Oil displacement type fracturing fluid system and preparation method thereof |
| CN113187458A (en) * | 2021-05-31 | 2021-07-30 | 新疆正通石油天然气股份有限公司 | Method for improving recovery ratio by injecting oil displacement agent into oil layer by using fracturing pad fluid |
| CN115851251A (en) * | 2021-09-23 | 2023-03-28 | 中国石油天然气股份有限公司 | Fracturing oil displacement agent and preparation method and application thereof |
| CN116836071A (en) * | 2023-07-03 | 2023-10-03 | 广州市米粒科技信息有限公司 | Moisturizing surfactant, preparation method and moisturizing skin care liquid |
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