CN105754569B - A kind of low-permeability oil deposit water injection well pretreating agent and preparation method thereof - Google Patents
A kind of low-permeability oil deposit water injection well pretreating agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of low-permeability oil deposit water injection well pretreating agents, belong to water flooding technical field.The pretreating agent includes the component of following mass percentage：Surfactant 0.3 0.8%, ammonium chloride 1 2%, ethyl alcohol 2 5%, little molecular cation peptides bioactivator polymer 2 5%, ethylene glycol monobutyl ether 1 5%, hydrochloric acid 10 15%, hydrofluoric acid 1 3%, corrosion inhibiter 2 4%, ferrous stability 1 2%, surplus are water, and wherein surfactant includes the component of following mass percentage：Fluorocarbon surfactant 75 90%, surplus are glycine betaine and/or fatty diglycollic amide.Each component compatibility is good in the pretreatment of the present invention, can use simultaneously, and the multistage plug before oil-water well is moved on to pre-processes effective integration into a slug, can not only oil water interfacial tension be reduced to 3 × 10‑4MN/m and hereinafter, reduce water injection pressure, while also having the effect of anti-swollen and releasing solid phase blocking, not only effectively achieve the purpose that increasing injection, and significantly improve construction efficiency.
Description
Technical field
The present invention relates to water flooding technical field, more particularly to a kind of low-permeability oil deposit water injection well pretreating agent and
Preparation method.
Background technology
In recent years, to the exploitation of low permeability oil and gas field by domestic and international more and more concerns.In recent proved reserves and
Accumulative to verify in non-producing reserves, low-permeability oil deposit reserves proportion is up to 65%~70%, and opens low-permeability oil deposit
Hair is mainly using waterflooding extraction mode (including the new well of stake and oil well to injection).
Waterflooding extraction refers to that water is injected oil reservoir using water injection well, to supplement and keep formation pressure.In waterflooding extraction
In the process, the problem of generally existing water injection pressure is high, and water injection rate cannot meet geology injection allocation requirement, causes stratum energy that cannot obtain
Waterflood development of low-permeability reservoirs effect is influenced to being replenished in time.The reason of causing above-mentioned phenomenon is as follows：(1) low-permeability oil deposit master
Will be based on hypotonic, low hole, narrow throat, reservoir clay mineral content is relatively high, and sensibility is strong, is extremely vulnerable, causes
Difficult water injection, which is even noted, does not intake；(2) strongly hydrophilic of low-permeability oil deposit near wellbore zone causes water to be locked, and causes water injection pressure continuous
It increases, difficult water injection；(3) with the extension of water injection time, the oil film in the duct of water injection well near wellbore zone is gradually rushed by injection water
It washes off, the moisture film of formation is more and more thicker, and water phase permeability continuously decreases, and water filtrational resistance is increasing, finally results in water filling pressure
Power rises, and water-injection efficiency declines, and stratum is shorted for a long time.So before carrying out waterflooding extraction, need to locate water injection well in advance
Reason.
It is mainly to the preprocessing process that water injection well is taken at present：In water injection well normally throw, before metaideophone, first to
Trimethylene carbonate, ethylene carbonate esters surfactant are injected in stratum to reduce oil water interfacial tension；Then again to ground
Injection expansion-resisting agent carries out antiswelling pretreatment in layer, with good ground；Acidulant is finally injected into stratum again to release in stratum
Solid phase block.
Inventor has found that the prior art at least has following technical problem：
Compatibility is poor between surfactant, expansion-resisting agent and acidulant in the prior art, cannot use simultaneously, can only sequence
Injection, causes construction efficiency relatively low, and cannot effectively achieve the purpose that increasing injection.
Invention content
Technical problem to be solved of the embodiment of the present invention is, provide a kind of compatibility it is good can effectively reduce water filling
Low-permeability oil deposit water injection well pretreating agent of pressure and preparation method thereof.Specific technical solution is as follows：
On the one hand, a kind of low-permeability oil deposit water injection well pretreating agent is provided, the component of following mass percentage is included：
Surfactant 0.3-0.8%, ammonium chloride 1-2%, ethyl alcohol 2-5%, little molecular cation peptides bioactivator polymer 2-5%, ethylene glycol only son
Ether 1-5%, hydrochloric acid 10-15%, hydrofluoric acid 1-3%, corrosion inhibiter 2-4%, ferrous stability 1-2%, surplus are water；
The surfactant includes the component of following mass percentage：Fluorocarbon surfactant 75-90%, surplus are
Glycine betaine and/or fatty diglycollic amide.
Preferably, the pretreating agent includes the component of following mass percentage：Surfactant 0.4-0.6%,
Ammonium chloride 1.5-2%, ethyl alcohol 3-4%, little molecular cation peptides bioactivator polymer 2-3%, ethylene glycol monobutyl ether 3-5%, hydrochloric acid 10-
12%, hydrofluoric acid 1-1.5%, corrosion inhibiter 2-3%, ferrous stability 1.5-2%, surplus are water；
The surfactant includes the component of following mass percentage：Fluorocarbon surfactant 90%, glycine betaine
5%, fatty diglycollic amide 5%.
Specifically, the fluorocarbon surfactant is selected from FC-03 type surfactants.
Specifically, the little molecular cation peptides bioactivator polymer is organic polyquaternium.
Preferably, the little molecular cation peptides bioactivator polymer is dimethyldiallylammonium chloride.
Specifically, the corrosion inhibiter in Man Xini bases and pyridines, quaternary ammonium salts, alkynol class corrosion inhibiter at least
It is a kind of.
On the other hand, a kind of preparation method of above-mentioned low-permeability oil deposit water injection well pretreating agent is provided, including：According to
The mass percentage of each component in low-permeability oil deposit water injection well pretreating agent, by fluorocarbon surfactant, ammonium chloride, ethyl alcohol,
Little molecular cation peptides bioactivator polymer, ethylene glycol monobutyl ether, hydrochloric acid, hydrofluoric acid, corrosion inhibiter, ferrous stability and water are uniformly mixed,
Obtain low-permeability oil deposit water injection well pretreating agent.
Preferably, the method includes：According to the quality percentage of each component in low-permeability oil deposit water injection well pretreating agent
Content prepares the first solution and prepares the second solution respectively using the water of part；
The water of first solution, second solution and remainder is mixed, after stirring evenly, obtains hyposmosis
Oil reservoir injection well pretreating agent；
The first solution of the preparation is：Contained according to the quality percentage of each component in low-permeability oil deposit water injection well pretreating agent
Ammonium chloride and part water are added in stirred tank amount, and stirring to the ammonium chloride is completely dissolved in water, and it is molten that preparation obtains first
Liquid；
The second solution of the preparation is：At 50-70 DEG C, ethyl alcohol is added in stirred tank, then under stirring, to
Fluorocarbon surfactant, the water of another part, ethylene glycol monobutyl ether, hydrochloric acid, corrosion inhibiter, hydrogen fluorine are sequentially added in the stirred tank
Acid, ferrous stability, stir evenly, and preparation obtains the second solution.
Specifically, during the second solution of the preparation, after a kind of component is added into the stirred tank, stirring
20-30 minutes, another component is then added into the stirred tank again.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
Pretreating agent provided in an embodiment of the present invention, the compatibility between above-mentioned each component is good, can use, pass through simultaneously
Collaboration complex role between each component, the multistage plug before which moves on to oil-water well pre-process effective integration into a section
Plug, can not only be reduced to 3 × 10 by oil water interfacial tension-4MN/m and hereinafter, reduce water injection pressure, while also there is anti-swollen and solution
Except the effect that solid phase blocks, increasing injection is not only effectively achieved the purpose that, and significantly improve construction efficiency.
Specific implementation mode
To keep technical scheme of the present invention and advantage clearer, embodiment of the present invention will be made below further detailed
Thin description.
On the one hand, a kind of low-permeability oil deposit water injection well pretreating agent is provided, the component of following mass percentage is included：
Surfactant 0.3-0.8%, ammonium chloride 1-2%, ethyl alcohol 2-5%, little molecular cation peptides bioactivator polymer 2-5%, ethylene glycol only son
Ether 1-5%, hydrochloric acid 10-15%, hydrofluoric acid 1-3%, corrosion inhibiter 2-4%, ferrous stability 1-2%, surplus are water；
Wherein, surfactant includes the component of following mass percentage：Fluorocarbon surfactant 75-90%, surplus
For glycine betaine and/or fatty diglycollic amide.
Pretreating agent provided in an embodiment of the present invention, the compatibility between above-mentioned each component is good, can use, pass through simultaneously
Collaboration complex role between each component, the multistage plug before which moves on to oil-water well pre-process effective integration into a section
Plug, can not only be reduced to 10 by oil water interfacial tension-4MN/m and hereinafter, reduce water injection pressure, while also having anti-swollen and releasing
The effect that solid phase blocks, has not only effectively achieved the purpose that increasing injection, and significantly improve construction efficiency.
It can be seen from the above, pretreating agent provided in an embodiment of the present invention, due to can be by pretreatment fluid and in-place oil interface
Tension is reduced to 3 × 10-4MN/m and hereinafter, displacement efficiency can be effectively improved, releases residual oil and blocks, while eliminating capillary resistance
Power releases water blocking damage and achievees the purpose that increasing injection to reduce water injection pressure.Due to each ingredient in the pretreating agent
Compatibility it is preferable, can use simultaneously, you can used simultaneously as a slug, avoid multistage plug processing, reduce note
While water pressure, also have the effect of anti-swollen and release solid phase blocking, effectively stabilizes stratum and relieve residual oil, water lock
Etc. liquid phases injury, simplify working procedure, significantly improve construction efficiency.
Further, the embodiment of the present invention additionally provides a kind of pretreating agent with optimum ratio, the pretreating agent packet
Include the component of following mass percentage：Surfactant 0.4-0.6%, ammonium chloride 1.5-2%, ethyl alcohol 3-4%, small molecule sun
Ionomer 2-3%, ethylene glycol monobutyl ether 3-5%, hydrochloric acid 10-12%, hydrofluoric acid 1-1.5%, corrosion inhibiter 2-3%, iron from
Sub- stabilizer 1.5-2%, surplus are water；
Wherein, which includes the component of following mass percentage：Fluorocarbon surfactant 90%, glycine betaine
5%, fatty diglycollic amide 5%.
It is understood that in pretreating agent provided in an embodiment of the present invention, above-mentioned each component is that this field is common
Product.Those skilled in the art can be readily available above-mentioned each component.
Surfactant in the embodiment of the present invention is a kind of complexed surfactant, by fluorocarbon surfactant conduct
The mixture of major constituent, glycine betaine, fatty diglycollic amide or both arbitrary proportion makes the composite surface as accessory constituent
Activating agent has water and oil repellence double properties, and reduction solution surface tension ability is extremely notable, for improving aqueous solution wetability
And good effect can be generated in terms of reducing interfacial tension.For example, above-mentioned fluorocarbon surfactant is the table of FC-03 models
Face activating agent；Above-mentioned glycine betaine can be empgen BB or Cocoamidopropyl betaine；Above-mentioned aliphatic acid diethyl
Alkylolamides refers to cocoanut fatty acid diethanolamide.
Specifically, above-mentioned little molecular cation peptides bioactivator polymer is the dimethyldiallylammonium chloride in organic polyquaternium.
In the embodiment of the present invention, above-mentioned little molecular cation peptides bioactivator polymer not only has the strong coalescence effect of high-valence cationic,
Also there is absorption film-forming effect of the high polymer to expansive clay surface, be comparatively ideal inhibitor.The ability of its stable clay
Not only far more than inorganic salts (such as calcium salt, sylvite), also far more than widely used polyacrylate clay stabilizer.It should
Micromolecular cationic polymer can be used as clay stabilizer with ammonium chloride, to inhibit clay swell, good ground.
Specifically, above-mentioned corrosion inhibiter is by Man Xini bases corrosion inhibiter and pyridines corrosion inhibiter, quaternary ammonium salts corrosion inhibiter, alkynol
One or more of class corrosion inhibiter compounds.Since Man Xini bases corrosion inhibiter is to slowing down the corruption of acid filling pipeline and equipment etc.
Erosion has significant effect, so the preferred Man Xini bases corrosion inhibiter of corrosion inhibiter in the embodiment of the present invention.
Specifically, ethylene glycol monobutyl ether is low toxicity material, water-soluble and alcohol, has high thinner ratio with petroleum hydrocarbon.
In pretreating agent provided in an embodiment of the present invention, ethylene glycol monobutyl ether is not only excellent solvent or excellent surface is lived
Property agent, can effectively remove grease.
The acidification agent of hydrochloric acid and hydrofluoric acid as Low Damage in pretreating agent of the present invention uses, and can not only pass through solution
Permeability is improved except solid phase blocks and reacts away subterranean minerals, moreover it is possible to be reduced the pressure drop of near wellbore zone, and is reduced injection water
Blocking of the middle solid phase particles near wellbore zone.Moreover, the cooperation of the two can also be reacted with sensitive clay mineral, stratum is reduced
Sensibility reduces hydration swelling, achievees the purpose that protect reservoir.It is understood that industrial mud acid commonly used in the art can be with
Substitute the hydrochloric acid and hydrofluoric acid described in the embodiment of the present invention.
Specifically, the ferrous stability in pretreating agent provided in an embodiment of the present invention is generally by pH value controlling agent, chela
Mixture and reducing agent composition, can prevent the generation of the secondary precipitation caused by iron ion.
On the other hand, the embodiment of the present invention additionally provides a kind of preparation of above-mentioned low-permeability oil deposit water injection well pretreating agent
Method, including：According to the mass percentage of each component in low-permeability oil deposit water injection well pretreating agent, by surfactant, chlorine
Change ammonium, ethyl alcohol, little molecular cation peptides bioactivator polymer, ethylene glycol monobutyl ether, hydrochloric acid, hydrofluoric acid, corrosion inhibiter, ferrous stability and water
It is uniformly mixed, obtains low-permeability oil deposit water injection well pretreating agent.As it can be seen that this method is simple, and it is easy to operate, it is conducive to improve construction effect
Rate.
Preferably, in order to improve the pretreating agent confecting efficiency, reduce and prepare the time, this method includes：According to hypotonic
The mass percentage of each component is prepared the first solution and is matched respectively using the water of part in saturating oil reservoir injection well pretreating agent
Make the second solution；
The water of above-mentioned first solution, the second solution and remainder is mixed, after stirring evenly, obtains low-permeability oil deposit
Water injection well pretreating agent；
Wherein, preparing the first solution is：Contained according to the quality percentage of each component in low-permeability oil deposit water injection well pretreating agent
Ammonium chloride and part water are added in stirred tank amount, and stirring to the ammonium chloride is completely dissolved in water, and it is molten that preparation obtains first
Liquid.
Preparing the second solution is：At 50-70 DEG C, ethyl alcohol is added in stirred tank, then under stirring, to described
Sequentially added in stirred tank surfactant, the water of another part, ethylene glycol monobutyl ether, hydrochloric acid, corrosion inhibiter, hydrofluoric acid, iron from
Sub- stabilizer, stirs evenly, and preparation obtains the second solution.
It is understood that the first solution of above-mentioned preparation and preparation limitation of second solution without sequencing, the two are preferred
It is carried out at the same time.
Specifically, be completely dissolved for the ease of each component, improve compatibility, during preparing the second solution, to
After a kind of component is added in stirred tank, stirs 20-30 minute, another kind component is then added into stirred tank again.
The present invention will be further described through by specific embodiment below.
Be not specified condition person in following specific examples, the condition suggested according to normal condition or manufacturer into
Row.It is raw materials used be not specified production firm and specification person be can be with conventional products that are commercially available.
Wherein, the specifying information of the raw material used in following embodiment is as follows：
Embodiment 1
A kind of low-permeability oil deposit water injection well pretreating agent is present embodiments provided, the group of following mass percentage is included
Point：Surfactant 0.6%, ammonium chloride 2%, ethyl alcohol 5%, dimethyldiallylammonium chloride 2%, ethylene glycol monobutyl ether 1%,
Hydrochloric acid 12%, hydrofluoric acid 1%, corrosion inhibiter 2%, ferrous stability 2%, surplus are water.Wherein, surfactant includes following
The component of mass percentage：Fluorocarbon surfactant 85%, Cocoamidopropyl betaine 3%, coco-nut oil fatty acid diethyl
Alkylolamides 12%.
The preparation method of the pretreating agent is as follows：
Prepare the first solution：According to the mass percentage of each component in the pretreating agent, ammonium chloride and part water are added
Enter in stirred tank, stirring to ammonium chloride is completely dissolved in water, and preparation obtains the first solution.
Prepare the second solution：At 50 DEG C, ethyl alcohol is added in stirred tank, then under stirring, into stirred tank
It is added surfactant, after stirring 30 minutes, then sequentially adds into stirred tank the water, two allyl of chlorodimethyl of another part
Base ammonium, ethylene glycol monobutyl ether, hydrochloric acid, corrosion inhibiter, hydrofluoric acid, ferrous stability, stir evenly, and preparation obtains the second solution.
Wherein, a kind of component is often added into stirred tank, another component, mixing time is added in 20-30 minutes in stirring into stirred tank again
It can arbitrarily be selected between 20-30 minutes.
The water of above-mentioned first solution, the second solution and remainder is mixed, after stirring evenly, obtains low-permeability oil deposit
Water injection well pretreating agent.
Embodiment 2
A kind of low-permeability oil deposit water injection well pretreating agent is present embodiments provided, the group of following mass percentage is included
Point：Fluorocarbon surfactant 0.8%, ammonium chloride 1%, ethyl alcohol 2%, dimethyldiallylammonium chloride 4%, ethylene glycol monobutyl ether
5%, hydrochloric acid 10%, hydrofluoric acid 3%, corrosion inhibiter 2%, ferrous stability 1%, surplus are water.Wherein, surfactant includes
The component of following mass percentage：Fluorocarbon surfactant 93%, cocoanut fatty acid diethanolamide 7%.
The preparation method of the pretreating agent is as follows：
Prepare the first solution：According to the mass percentage of each component in the pretreating agent, ammonium chloride and part water are added
Enter in stirred tank, stirring to ammonium chloride is completely dissolved in water, and preparation obtains the first solution.
Prepare the second solution：At 60 DEG C, ethyl alcohol is added in stirred tank, then under stirring, into stirred tank
It is added surfactant, after stirring 30 minutes, then sequentially adds into stirred tank the water, two allyl of chlorodimethyl of another part
Base ammonium, ethylene glycol monobutyl ether, hydrochloric acid, corrosion inhibiter, hydrofluoric acid, ferrous stability, stir evenly, and preparation obtains the second solution.
Wherein, a kind of component is often added into stirred tank, another component, mixing time is added in 20-30 minutes in stirring into stirred tank again
It can arbitrarily be selected between 20-30 minutes.
The water of above-mentioned first solution, the second solution and remainder is mixed, after stirring evenly, obtains low-permeability oil deposit
Water injection well pretreating agent.
Embodiment 3
A kind of low-permeability oil deposit water injection well pretreating agent is present embodiments provided, the group of following mass percentage is included
Point：Surfactant 0.3%, ammonium chloride 2%, ethyl alcohol 4%, dimethyldiallylammonium chloride 5%, ethylene glycol monobutyl ether 3%,
Hydrochloric acid 15%, hydrofluoric acid 2%, corrosion inhibiter 4%, ferrous stability 2%, surplus are water.Wherein, surfactant includes following
The component of mass percentage：Fluorocarbon surfactant 95%, Cocoamidopropyl betaine 5%.
The preparation method of the pretreating agent is as follows：
Prepare the first solution：According to the mass percentage of each component in the pretreating agent, ammonium chloride and part water are added
Enter in stirred tank, stirring to ammonium chloride is completely dissolved in water, and preparation obtains the first solution.
Prepare the second solution：At 70 DEG C, ethyl alcohol is added in stirred tank, then under stirring, into stirred tank
It is added surfactant, after stirring 30 minutes, then sequentially adds into stirred tank the water, two allyl of chlorodimethyl of another part
Base ammonium, ethylene glycol monobutyl ether, hydrochloric acid, corrosion inhibiter, hydrofluoric acid, ferrous stability, stir evenly, and preparation obtains the second solution.
Wherein, a kind of component is often added into stirred tank, another component, mixing time is added in 20-30 minutes in stirring into stirred tank again
It can arbitrarily be selected between 20-30 minutes.
The water of above-mentioned first solution, the second solution and remainder is mixed, after stirring evenly, obtains low-permeability oil deposit
Water injection well pretreating agent.
Embodiment 4
A kind of low-permeability oil deposit water injection well pretreating agent is present embodiments provided, the group of following mass percentage is included
Point：Fluorocarbon surfactant 0.5%, ammonium chloride 1.8%, ethyl alcohol 3.5%, dimethyldiallylammonium chloride 2.5%, ethylene glycol
Monobutyl ether 3.5%, hydrochloric acid 11%, hydrofluoric acid 1.5%, corrosion inhibiter 2.5%, ferrous stability 1.5%, surplus are water.Wherein,
Surfactant includes the component of following mass percentage：Fluorocarbon surfactant 90%, Cocoamidopropyl betaine
5%, cocoanut fatty acid diethanolamide 5%.
The preparation method of the pretreating agent is as follows：
Prepare the first solution：According to the mass percentage of each component in the pretreating agent, ammonium chloride and part water are added
Enter in stirred tank, stirring to ammonium chloride is completely dissolved in water, and preparation obtains the first solution.
Prepare the second solution：At 65 DEG C, ethyl alcohol is added in stirred tank, then under stirring, into stirred tank
It is added surfactant, after stirring 30 minutes, then sequentially adds into stirred tank the water, two allyl of chlorodimethyl of another part
Base ammonium, ethylene glycol monobutyl ether, hydrochloric acid, corrosion inhibiter, hydrofluoric acid, ferrous stability, stir evenly, and preparation obtains the second solution.
Wherein, a kind of component is often added into stirred tank, another component, mixing time is added in 20-30 minutes in stirring into stirred tank again
It can arbitrarily be selected between 20-30 minutes.
The water of above-mentioned first solution, the second solution and remainder is mixed, after stirring evenly, obtains low-permeability oil deposit
Water injection well pretreating agent.
Embodiment 5
The present embodiment measures the pretreatment provided using embodiment 1-4 using the crude oil of the Nanpu Oilfield in NW Hebei
Agent treated oil water interfacial tension.
The test method of the interfacial tension is as follows：
Interface tension test instrument is dripped using rotation, under reservoir temperature, to the oil between target block crude oil and pretreating agent
Water interfacial tension is tested, unit mN/m.When test, instrument is first warming up to reservoir temperature, will then be filled in capillary
Full pretreating agent simultaneously catches up with bubble in pipe only, and target block crude oil is then injected into capillary center with micro- sample injector, then
Liquid in capillary is filled with pretreating agent solution, the capillary for covering pressure cap is packed into instrument, opens flash lamp, adjustment is suitable
Rotating speed, pass through measure oil droplet diameter in pretreatment fluid, calculate oil water interfacial tension value.
The test result of the oil water interfacial tension of said determination is as shown in table 1：
Table 1
| Used pretreating agent | Oil water interfacial tension (mN/m) |
| Embodiment 1 | 3×10-4 |
| Embodiment 2 | 1.5×10-4 |
| Embodiment 3 | 2×10-4 |
| Embodiment 4 | 4×10-5 |
As shown in Table 1, pretreating agent provided in an embodiment of the present invention can effectively reduce oil water interfacial tension, this is for drop
Low water injection pressure improves increasing injection effect and has great importance.
Embodiment 6
The present embodiment is handled live water injection well using the pretreating agent that embodiment 4 provides.
Background：A bite producing well of No. 4 construction 403-1 fault blocks in Nanpu Oilfield south fort.The 28# of operation on May 2nd, 2011,
30#, 33-37#, 40# layers.Initial stage produces 6.9 tons of liquid daily, day 5.8 tons of oil-producing, aqueous 15.3%, gas-oil ratio 263m3/ t, hydrodynamic face
2084m.2.9 tons of liquid of daily output at present, day 1.91 tons of oil-producing, aqueous 34.2%, gas-oil ratio 484m3/ t, hydrodynamic face 1961m.Metaideophone
The eastern two sections of oil reservoir energy of supplement.The pretreating agent provided with embodiment 4 before metaideophone is pre-processed, operational discharge capacity 2-3L/min.
Work progress：The pretreating agent solution that embodiment 4 provides is pulled to scene with acid tank truck, clean ground is imported and matches
Sour pond, to ensure the lasting injection of pretreating agent solution.After pretreatment fluid is fully injected into stratum using 2 700 type pump trucks, then
2% ammonium chloride solution is replaced, closing well reacts 1-2 hours.Drain, until residual night PH=7, drive a well water filling.Wherein, pretreating agent is set
It is 90 cubic metres, operation pressure 10MPa, operational discharge capacity 260L/min to count dosage.
The result shows that after by injecting the pretreating agent that embodiment 2 provides, water injection pressure reduces 6MPa, daily water-injection rate
5 cubic metres are increased, has been continuously injected at present 6 months, daily water-injection rate keeps stablizing.As it can be seen that provided in an embodiment of the present invention
Pretreating agent has not only reached the purpose of increasing injection, and effectively increase construction efficiency by forming a slug.
The foregoing is merely presently preferred embodiments of the present invention, the protection domain being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (6)
1. a kind of low-permeability oil deposit water injection well pretreating agent, includes the component of following mass percentage：Surfactant 0.3-
0.8%, ammonium chloride 1-2%, ethyl alcohol 2-5%, little molecular cation peptides bioactivator polymer 2-5%, ethylene glycol monobutyl ether 1-5%, hydrochloric acid 10-
15%, hydrofluoric acid 1-3%, corrosion inhibiter 2-4%, ferrous stability 1-2%, surplus are water；
The surfactant includes the component of following mass percentage：Fluorocarbon surfactant 75-90%, surplus are beet
Alkali and fatty diglycollic amide；
The little molecular cation peptides bioactivator polymer is dimethyldiallylammonium chloride；
The fluorocarbon surfactant is the fluorocarbon surfactant of FC-03 models.
2. pretreating agent according to claim 1, which is characterized in that the pretreating agent includes following mass percentage
Component：Surfactant 0.4-0.6%, ammonium chloride 1.5-2%, ethyl alcohol 3-4%, little molecular cation peptides bioactivator polymer 2-3%, second
It is glycol monobutyl ether 3-5%, hydrochloric acid 10-12%, hydrofluoric acid 1-1.5%, corrosion inhibiter 2-3%, ferrous stability 1.5-2%, remaining
Amount is water；
The surfactant includes the component of following mass percentage：Fluorocarbon surfactant 90%, glycine betaine 5%, fat
Fat acid diglycollic amide 5%.
3. pretreating agent according to claim 1 or 2, which is characterized in that the corrosion inhibiter is selected from Man Xini bases and pyrrole
At least one of pyridine class, quaternary ammonium salts, alkynol class corrosion inhibiter.
4. a kind of preparation method of low-permeability oil deposit water injection well pretreating agent described in claim 1, including：According to low-permeability oil
The mass percentage for hiding each component in water injection well pretreating agent, by surfactant, ammonium chloride, ethyl alcohol, little molecular cation peptides bioactivator
Polymer, ethylene glycol monobutyl ether, hydrochloric acid, hydrofluoric acid, corrosion inhibiter, ferrous stability and water are uniformly mixed, and obtain low-permeability oil
Hide water injection well pretreating agent；
The fluorocarbon surfactant is the fluorocarbon surfactant of FC-03 models；
The little molecular cation peptides bioactivator polymer is dimethyldiallylammonium chloride.
5. according to the method described in claim 4, it is characterized in that, the method includes：It is pre- according to low-permeability oil deposit water injection well
The mass percentage of each component in inorganic agent prepares the first solution and prepares the second solution respectively using the water of part；
The water of first solution, second solution and remainder is mixed, after stirring evenly, obtains low-permeability oil deposit
Water injection well pretreating agent；
The first solution of the preparation is：It, will according to the mass percentage of each component in low-permeability oil deposit water injection well pretreating agent
Ammonium chloride is added with part water in stirred tank, and stirring to the ammonium chloride is completely dissolved in water, and preparation obtains the first solution；
The second solution of the preparation is：At 50-70 DEG C, ethyl alcohol is added in stirred tank, then under stirring, to described
Sequentially added in stirred tank surfactant, the water of another part, little molecular cation peptides bioactivator polymer ethylene glycol monobutyl ether, hydrochloric acid,
Corrosion inhibiter, hydrofluoric acid, ferrous stability, stir evenly, and preparation obtains the second solution.
6. according to the method described in claim 5, it is characterized in that, during the second solution of the preparation, often stirred to described
It mixes after a kind of component is added in kettle, stirs 20-30 minute, another kind component is then added into the stirred tank again.
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| CN107868660A (en) * | 2016-09-23 | 2018-04-03 | 深圳市百勤石油技术有限公司 | A kind of emulsification acid solution of oil-gas reservoir acidifying and preparation method thereof |
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