CN107652965A - A kind of low frictional resistance gel acid and preparation method thereof - Google Patents
A kind of low frictional resistance gel acid and preparation method thereof Download PDFInfo
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- CN107652965A CN107652965A CN201610596653.XA CN201610596653A CN107652965A CN 107652965 A CN107652965 A CN 107652965A CN 201610596653 A CN201610596653 A CN 201610596653A CN 107652965 A CN107652965 A CN 107652965A
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- frictional resistance
- low frictional
- acid
- gelling agent
- gel acid
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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
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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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
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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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
- C09K2208/28—Friction or drag reducing additives
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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
- C09K2208/32—Anticorrosion additives
Abstract
The invention discloses a kind of low frictional resistance gel acid and preparation method thereof, belong to oil well acidation field.The low frictional resistance gel acid includes following components in percentage by weight：Gelling agent：0.2% 0.5%；Corrosion inhibiter：1% 4%；Inhibition synergist：0.1 1%；Ferrous stability：1% 2%；Cleanup additive：1% 2%；Hydrochloric acid：15% 23%；Surplus is water.Wherein, gelling agent is made up of the homopolymer and chain extender of MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and mass fraction of the chain extender in the gelling agent is 0.001%~0.005%.Low frictional resistance gel acid provided in an embodiment of the present invention, by adding chain extender, it is effectively increased the molecular weight of homopolymer in gelling agent, so as to improve the tackifying ability of gelling agent and resistance-reducing performance, and then reduce gel acid frictional resistance, the pressure needed for fracture acidizing mesohigh pump truck is reduced, saves the energy and fracture acidizing cost.Meanwhile chemisorbed layer is cooperatively formed in metal surface by corrosion inhibiter and inhibition synergist, slow down corrosion of metal.
Description
Technical field
The present invention relates to oil well acidation field, more particularly to a kind of low frictional resistance gel acid and preparation method thereof.
Background technology
Fracture acidizing is a kind of conventional Carbonate Reservoir modification measures, is noted by high pressure pump truck into carbonate reservoir
Enter acid solution, to form acid-etched fracture larger and with certain flow conductivity, eliminate the blocking in reservoir, link up in reservoir
Intrinsic fracture and hole, so as to expand the seepage range of oil gas in reservoir, realize the increase of oil or gas production.And with
The increase of christmas depth, some deep-wells, the bottom pressure of ultradeep well are up to 130MPa, and bottom hole temperature (BHT) is up to more than 160 DEG C, acid
Viscosity reduction, shear resistant are poor at high temperature under high pressure for liquid, it is difficult to realize that depth of reservoirs is acidified, cause yield-increasing efficiency low.Cause
This, there is provided a kind of acid solution suitable for Temperature Deep Carbonate Reservoir is highly important.
Prior art provides a kind of gel acid acid solution, and the gel acid acid solution includes following components, wherein, gelling agent presses matter
Percent by volume is measured, other components press percent by volume：Gelling agent：0.6-0.8%, corrosion inhibiter：2-4%, cleanup additive：1-2%,
Ferrous stability 1-2%, hydrochloric acid 15-22%, surplus are water.By adding gelling agent into gel acid acid solution, acid solution is improved
The molecular weight of middle polymer, increase the viscosity and shearing force of acid solution, so as to make by the gel acid acid solution in HTHP reservoir
The crack with certain flow conductivity is formed, and then improves the yield of oil or natural gas.
Inventor has found that prior art at least has following technical problem：
The gel acid acid solution frictional resistance that prior art provides is higher, i.e., the frictional resistance between gel acid acid solution and oil pipe tube wall
Larger, when needing the gel acid acid solution being pressed into petroleum reservoir from ground, pressure needed for high pressure pump truck is larger, adds pressure break
The cost of acidifying.Meanwhile corrosion of the gel acid acid solution of prior art offer at high temperature to oil pipe is more serious, exists serious
Acidizing corrosion risk.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided one kind has low frictional resistance and antiseptic property is good
Good low frictional resistance gel acid and preparation method thereof, concrete technical scheme is as follows：
In a first aspect, the embodiments of the invention provide a kind of low frictional resistance gel acid, the low frictional resistance gel acid includes following heavy
Measure the component of percentage：
Gelling agent：0.2%-0.5%；
Corrosion inhibiter：1%-4%；
Inhibition synergist：0.1%-1%；
Ferrous stability：1%-2%；
Cleanup additive：1%-2%；
Hydrochloric acid：15%-23%；
Surplus is water.
Wherein, the gelling agent is made up of the homopolymer and chain extender of MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and
And mass fraction of the chain extender in the gelling agent is 0.001%~0.005%.
Specifically, preferably, the corrosion inhibiter is quinoline quaternary ammonium salt and/or Mannich base quaternary ammonium salt.
Specifically, preferably, the inhibition synergist is propilolic alcohol and/or pyroantimonate.
Specifically, preferably, the ferrous stability is in citric acid, sodium nitrilo triacetate, sodium isoascorbate
At least one.
Specifically, preferably, the cleanup additive includes following components in percentage by weight：APEO 65%-
75%th, ethylene glycol monobutyl ether 10%-20%, n-octyl alcohol 15%-25%.
Specifically, preferably, the hydrochloric acid is mass concentration 30%-32% technical hydrochloric acid.
Specifically, preferably, the chain extender is polyethyleneglycol diacrylate, N hydroxymethyl acrylamide, N, N-
At least one of methylene-bisacrylamide.
Specifically, preferably, the viscosity average molecular weigh of the gelling agent is more than 10,000,000.
Second aspect, the embodiments of the invention provide a kind of preparation method of low frictional resistance gel acid, methods described include with
Lower step：
Hydrochloric acid, corrosion inhibiter, inhibition synergist, ferrous stability are sequentially added into liquid dispensing container, is stirred, then
Water and gelling agent are added, 15-25min is stirred, adds cleanup additive, after being well mixed, obtains the low frictional resistance gel acid.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
Low frictional resistance gel acid provided in an embodiment of the present invention, by using MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride
Homopolymer coordinates chain extender, and as gelling agent, under the synergy of each component of the gel acid, the chain extender can be effectively increased
The molecular weight of the homopolymer in gelling agent, so as to improve the tackifying ability of gelling agent and resistance-reducing performance, and then reduce gel acid
Frictional resistance, good mobility is made it have, reduce the pressure needed for fracture acidizing mesohigh pump truck, save the energy, reduce pressure break
The cost of acidifying.Meanwhile coordinate inhibition synergist to form firm chemisorbed layer in metal surface by corrosion inhibiter, from
And slow down corrosion of the gel acid to metal pipe materials such as oil pipes under 120 DEG C of -180 DEG C of high temperature, ensure that acidizing treatment is safe and effective.Can
See, low frictional resistance gel acid provided in an embodiment of the present invention, frictional resistance can be reduced, save acidifying cost, and antiseptic property is good
It is good, beneficial to the raising of christmas efficiency, suitable for large-scale promotion application.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is frictional resistance and resistance-reducing yield test curve in the low frictional resistance gel acid room of Example 1 and Example 2 of the present invention offer
Figure；
Fig. 2 is the ST2 well construction curve maps that the embodiment of the present invention 1 provides；
Fig. 3 is the ST1 well construction curve maps that the embodiment of the present invention 2 provides.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention will be made into one below
It is described in detail on step ground.
In a first aspect, the embodiments of the invention provide a kind of low frictional resistance gel acid, the low frictional resistance gel acid includes following heavy
Measure the component of percentage：
Gelling agent：0.2%-0.5%；
Corrosion inhibiter：1%-4%；
Inhibition synergist：0.1%-1%；
Ferrous stability：1%-2%；
Cleanup additive：1%-2%；
Hydrochloric acid：15%-23%；
Surplus is water.
Wherein, gelling agent is made up of the homopolymer and chain extender of MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and is expanded
Mass fraction of the chain agent in gelling agent is 0.001%~0.005%.
Low frictional resistance gel acid provided in an embodiment of the present invention, by using MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride
Homopolymer coordinates chain extender, and as gelling agent, under the synergy of each component of the gel acid, the chain extender can be effectively increased
The molecular weight of the homopolymer in gelling agent, so as to improve the tackifying ability of gelling agent and resistance-reducing performance, and then reduce gel acid
Frictional resistance, good mobility is made it have, reduce the pressure needed for fracture acidizing mesohigh pump truck, save the energy, reduce pressure break
The cost of acidifying.Meanwhile coordinate inhibition synergist to form firm chemisorbed layer in metal surface by corrosion inhibiter, from
And slow down corrosion of the gel acid to metal pipe materials such as oil pipes under 120 DEG C of -180 DEG C of high temperature, ensure that acidizing treatment is safe and effective.Can
See, low frictional resistance gel acid provided in an embodiment of the present invention, frictional resistance can be reduced, save acidifying cost, and antiseptic property is good
Good, beneficial to the raising of christmas efficiency, its is easy to use, suitable for large-scale promotion application.
Specifically, it is provided in an embodiment of the present invention low to rub in order to reduce the frictional resistance between gel acid and oil pipe tube wall
Gelling agent is with the addition of in resistance gel acid, the active component of gelling agent is the homopolymer of cationic monomer, i.e. methacryloxypropyl second
The homopolymer of base trimethyl ammonium chloride.The homopolymer improves the molecular weight of gel acid, so as to reduce the frictional resistance of gel acid,
It is easy to press-in of the gel acid into petroleum reservoir.Preferably, used methacryloxypropyl second in embodiments of the present invention
The molecular weight of the homopolymer of base trimethyl ammonium chloride is 1000-1200 ten thousand, such MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride
Homopolymer can significantly improve the heat resistance of main polymer chain, so as to avoid traditional acrylamide as gelling agent point
Hold problem of easy degradation in high temperature acid solution during sub- main chain, improve viscosity of the gel acid under 120 DEG C of -180 DEG C of high temperature and resist
Cutting performance, and then ensure that low frictional resistance gel acid provided in an embodiment of the present invention can be applied to Temperature Deep Carbonate Reservoir
Fracture acidizing, improve the yield of oil or natural gas.
Specifically, prior art can increase gelling to meet viscosity and requirement for anticorrosion of the gel acid in high temperature deep well
Agent and the usage amount of corrosion inhibiter.But roll up the dosage of gelling agent and corrosion inhibiter, also result in gel acid in deep-well construction
Frictional resistance increases, it is difficult to reaches the depths of oil and gas reservoir, while adds the cost of gel acid, is unfavorable for fracture acidizing job site
Use.And low frictional resistance gel acid provided in an embodiment of the present invention then adds chain extender in gelling agent, further to improve
The molecular weight of the homopolymer of MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride in gelling agent, and then make the viscosity average molecular weigh of gelling agent
Reach more than 10,000,000, so as to improve the tackifying ability of gelling agent and resistance-reducing performance, reduce needed for fracture acidizing mesohigh pump truck
Pressure, save the energy, reduce the cost of fracture acidizing.Preferably, the chain extender is polyethyleneglycol diacrylate, N- hydroxyls
At least one of Methacrylamide, N,N methylene bis acrylamide.On the one hand using polyethyleneglycol diacrylate, N-
NMA, N, for N- methylene-bisacrylamides as chain extender, it can reach the viscosity average molecular weigh of gelling agent
More than 10000000, on the other hand, after the chain extender uses certain time (1 hour) at a temperature of 120 DEG C -180 DEG C, polyethylene glycol
Diacrylate, the chain extender can decompose in gel acid, after gel acid enters stratum, with the increase of petroleum reservoir temperature,
The decomposition rate of polyethyleneglycol diacrylate, N hydroxymethyl acrylamide or N,N methylene bis acrylamide also gradually adds
It hurry up.Therefore, when carrying out closing well processing after fracture acidizing terminates, with polyethyleneglycol diacrylate, N- methylol acryloyls
Amine or N, N- methylene-bisacrylamide are in the decomposition of high temperature deep well bottom, and the viscosity of gel acid is gradually lowered, so as to favourable
In the row of returning of shaft bottom remaining acid solution, remaining acid solution is avoided to influence the exploitation of oil gas.
Specifically, in order to reduce corrosion of the gel acid to metal pipe materials such as oil pipes in hot environment (120 DEG C -180 DEG C),
Low frictional resistance gel acid selection quinoline quaternary ammonium salt and/or Mannich base quaternary ammonium salt provided in an embodiment of the present invention are as corrosion inhibiter.Profit
With electron delocalization enhancing inhibitor molecular larger on condensed cyclic structure in quinoline quaternary ammonium salt and/or Mannich base quaternary ammonium salt and metal
The coordination on surface combines, and coordinates inhibition synergist to form firm chemisorbed layer in metal surface, so as to by metal and glue
Solidifying acid solution is kept apart, and is slowed down corrosion of the gel acid to metal pipe materials such as oil pipes under high temperature, is ensured its oil recovery efficiency.
Specifically, in order to further enhance antiseptic effect of the corrosion inhibiter for metal pipe materials such as oil pipes, the embodiment of the present invention
The low frictional resistance gel acid selection propilolic alcohol and/or pyroantimonate provided is as inhibition synergist.Propilolic alcohol, pyroantimonate and quinoline
Quaternary ammonium salt, Mannich base quaternary ammonium salt corrosion inhibiter are engaged, and can be increased substantially the antiseptic effect of corrosion inhibiter, corrosion inhibiter is existed
The chemisorbed layer that metal surface is formed is more firm, and metal and gelling acid solution are effectively isolated, improve low frictional resistance gel acid
Corrosion mitigating effect.
Specifically, in order to avoid the metal pipe materials such as oil pipe and gelling acid liquid reaction generation precipitate, and stratum is caused secondary
, it is necessary to add ferrous stability in low frictional resistance gel acid, ferrous stability is preferably citric acid, nitrilotriacetic acid for pollution
At least two at least one of sodium, sodium isoascorbate, preferably citric acid, sodium nitrilo triacetate, sodium isoascorbate
Kind, and one of which should be sodium isoascorbate, to ensure the using effect of ferrous stability.Due to gelling acid solution and metal
When surface contacts, part iron ion can be made to enter stratum, and with the progress of acid-rock reaction in reservoir, gelling acid solution activity is gradually
Reduce, pH value rise, cause free iron to form Fe (OH)3Precipitation, so as to be polluted to reservoir.Citric acid, nitrilo three
Sodium acetate, sodium isoascorbate can be with free Fe3+Complexing or by Fe3+It is reduced to Fe2+, it is not produced in acid solution
Raw Fe (OH)3Precipitation, so as to return discharge oil well with residual acid, reduce pollution of the sediment of iron ion formation to reservoir.
Specifically, the row of returning for the ease of remaining acid solution during fracture acidizing from reservoir, the row of helping is added in gel acid
Agent, cleanup additive specifically include following components in percentage by weight：APEO 65%-75%, for example, 65%, 68%,
70%th, 72%, 75% etc., ethylene glycol monobutyl ether 10%-20%, for example, 10%, 12%, 15%, 18%, 20% etc., it is just pungent
Alcohol 15%-25%, for example, 15%, 18%, 20%, 22%, 25% etc..APEO, ethylene glycol monobutyl ether, n-octyl alcohol are equal
For nonionic surfactant, when three is by as above coordinating, it will assign the gel acid relatively low interfacial tension, reach
Below 8mN/m, meanwhile, above-mentioned cleanup additive does not react with other components in gel acid, injury is not produced to reservoir, so as to protect
Demonstrate,prove oil or gas extraction efficiency.
Specifically, in order to reduce the cost of gel acid, hydrochloric acid that low frictional resistance gel acid provided in an embodiment of the present invention uses
For technical hydrochloric acid, the mass concentration 30%-32% of technical hydrochloric acid, for example, 30%, 31%, 32% etc..
Specifically, to ensure the tackifying ability and resistance reducing effect of gelling agent in low frictional resistance gel acid, the viscous of gelling agent is divided equally
Son amount should be greater than 10,000,000.Pass through the chain extender polyethyleneglycol diacrylate in gelling agent, it is possible to increase the master in gelling agent
The molecular weight of the homopolymer of composition MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and then ensure that the molecular weight of gelling agent is at least big
In 10,000,000.Friction between gel acid and the oil pipe tube wall for conveying gel acid can be reduced by the macromolecular structure of gelling agent
Power, gel acid is ensured larger discharge capacity in reservoir by relatively small pump truck pressure, ensure low frictional resistance gel acid to height
The deep acidizing of warm deep-well, improve the oil and gas production of carbonate reservoir.
Second aspect, the embodiment of the present invention additionally provide a kind of preparation method of low frictional resistance gel acid, the preparation method bag
Include following steps：
According to the proportioning of each component in gel acid, sequentially added into liquid dispensing container hydrochloric acid, corrosion inhibiter, inhibition synergist,
Ferrous stability, stir, then add water and gelling agent, stir 15-25min, add cleanup additive, be well mixed
Afterwards, low frictional resistance gel acid is obtained.
It will be described in detail below by specific embodiment, in specific examples below, involved operation is not noted
Bright condition person, the condition suggested according to normal condition or manufacturer are carried out.Raw materials used unreceipted production firm and specification
Person is can be by the conventional products of acquisition purchased in market.
In embodiment 4 and 5, used raw material parameter is as follows：
Corrosion inhibiter：Into can the production of special development in science and technology Co., Ltd, trade name CT1-3 is high temperature acidified use corrosion inhibiter, work
Property composition is Mannich base quaternary ammonium salt；
Inhibition synergist：Into can the production of special development in science and technology Co., Ltd, the high temperature acidified inhibition synergy of trade name CT1-5
Agent, active component are pyroantimonate；
Ferrous stability：Into can the production of special development in science and technology Co., Ltd, trade name CT1-7 acidifying iron ions are steady
Determine agent, active component is sodium isoascorbate；
Gelling agent：Into can the production of special development in science and technology Co., Ltd, trade name CT1-9B is high temperature acidified use gelling agent, work
Property composition be MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride homopolymer and polyethyleneglycol diacrylate, wherein polyethylene glycol
Diacrylate it is high temperature acidified with mass fraction shared in gelling agent be 0.003%；
Cleanup additive：Into can the production of special development in science and technology Co., Ltd, trade name CT5-9 cleanup additive in use for acidification in, it includes
Following components in percentage by weight：APEO 70%, ethylene glycol monobutyl ether 10%, n-octyl alcohol 20%.
In addition, in the examples below, the resistance-reducing performance of gel acid is measured by the following method：
The low frictional resistance gel acid provided using pipeline friction test instrument following embodiment carries out friction test, control sample
This is clear water.Tested from 10mm calibers, record gel acid under a certain flow velocity and calculated by the pressure difference before and after pipeline
Resistance-reducing yield, resistance-reducing yield calculation formula are as follows：
In formula：
η-resistance-reducing yield, %
△PClear water- clear water passes through pressure difference during test line, KPa；
△PAcid solution- acid solution passes through pressure difference during test line, KPa.
Embodiment 1
A kind of low frictional resistance gel acid is present embodiments provided, the low frictional resistance gel acid includes the group of following percentage by weight
Point：
Gelling agent：0.2%；Corrosion inhibiter：2.5%；Inhibition synergist：0.2%；Ferrous stability：1.3%；Cleanup additive：
1.8%；Hydrochloric acid：15%；Surplus is water.
Wherein, gelling agent by MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride homopolymer and polyethyleneglycol diacrylate
Form, and mass fraction of the polyethyleneglycol diacrylate as chain extender in gelling agent is 0.001%, the gelling agent
Viscosity average molecular weigh is more than 10,000,000.Corrosion inhibiter is quinoline quaternary ammonium salt, and inhibition synergist is propilolic alcohol, and ferrous stability is lemon
Acid and sodium isoascorbate.Cleanup additive includes following components in percentage by weight：APEO 65%, ethylene glycol monobutyl ether
10%th, n-octyl alcohol 25%.Hydrochloric acid is the technical hydrochloric acid of mass concentration 30%.
The low frictional resistance gel acid is prepared via a method which to obtain：
Technical hydrochloric acid, corrosion inhibiter, inhibition synergist, ferrous stability are added into reaction vessel by said ratio, is stirred
Mix uniformly, then add water and gelling agent, stir 15min, add cleanup additive, after being well mixed, obtain the low frictional resistance glue
Solidifying acid.
Low frictional resistance gelling acid fluid system normal temperature (when i.e. temperature is 24 DEG C) apparent viscosity is 30mPa.s, 135 DEG C,
170s-1Under the conditions of, acid liquid viscosity is 19mPa.s after shearing 60min, disclosure satisfy that the shear strength of acid solution in high temperature deep well will
Ask.Dynamic Corrosion speed as little as 22.5g/m of the low frictional resistance gel acid to N80 steel discs2.h, the anti-of the low frictional resistance gel acid is illustrated
It is rotten functional.When 1 flowing velocity that can be seen that the low frictional resistance gel acid provided in embodiment 1 is 11m/s with reference to the accompanying drawings,
Compared with the clear water frictional resistance under identical caliber, discharge capacity, resistance-reducing yield is more than 70%, meets the lower deep-well construction requirement of 135 DEG C of well temperature.
Embodiment 2
A kind of low frictional resistance gel acid is present embodiments provided, the low frictional resistance gel acid includes the group of following percentage by weight
Point：
Gelling agent：0.5%；Corrosion inhibiter：2.5%；Inhibition synergist：1.0%；Ferrous stability：1.5%；Cleanup additive：
1.5%；Hydrochloric acid：20%；Surplus is water.
Wherein, gelling agent by MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride homopolymer and polyethyleneglycol diacrylate
Form, and mass fraction of the polyethyleneglycol diacrylate as chain extender in gelling agent is 0.005%, the gelling agent
Viscosity average molecular weigh is more than 10,000,000.Corrosion inhibiter is Mannich base quaternary ammonium salt, and inhibition synergist is pyroantimonate, ferrous stability
For sodium nitrilo triacetate and sodium isoascorbate.Cleanup additive includes following components in percentage by weight：APEO 75%, second
Glycol monobutyl ether 10%, n-octyl alcohol 15%.Hydrochloric acid is the technical hydrochloric acid of mass concentration 31%.
The low frictional resistance gel acid is prepared via a method which to obtain：
Technical hydrochloric acid, corrosion inhibiter, inhibition synergist, ferrous stability are added into liquid dispensing container by said ratio, is stirred
Mix uniformly, then add water and gelling agent, stir 25min, add cleanup additive, after being well mixed, obtain the low frictional resistance glue
Solidifying acid.
Low frictional resistance gelling acid fluid system normal temperature (when i.e. temperature is 24 DEG C) apparent viscosity is 45mPa.s, 160 DEG C,
170s-1Under the conditions of, acid liquid viscosity is 20mPa.s after shearing 60min, disclosure satisfy that the shear strength of acid solution in high temperature deep well will
Ask.Dynamic Corrosion speed as little as 43.4g/m of the low frictional resistance gel acid to N80 steel discs2.h, the anti-of the low frictional resistance gel acid is illustrated
It is rotten functional.When 1 flowing velocity that can be seen that the low frictional resistance gel acid provided in embodiment 2 is 11m/s with reference to the accompanying drawings,
Compared with the clear water frictional resistance under identical caliber, discharge capacity, resistance-reducing yield is more than 60%, meets the lower deep-well construction requirement of 160 DEG C of well temperature.
Embodiment 3
A kind of low frictional resistance gel acid is present embodiments provided, the low frictional resistance gel acid includes the group of following percentage by weight
Point：
Gelling agent：0.4%；Corrosion inhibiter：2.8%；Inhibition synergist：0.9%；Ferrous stability：1.8%；Cleanup additive：
1.3%；Hydrochloric acid：20%；Surplus is water.
Wherein, gelling agent by MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride homopolymer and polyethyleneglycol diacrylate
Form, and mass fraction of the polyethyleneglycol diacrylate as chain extender in gelling agent is 0.004%, the gelling agent
Viscosity average molecular weigh is more than 10,000,000.Corrosion inhibiter is quinoline quaternary ammonium salt and Mannich base quaternary ammonium salt, inhibition synergist be propilolic alcohol and
Pyroantimonate, ferrous stability are citric acid.Cleanup additive includes following components in percentage by weight：APEO 65%,
Ethylene glycol monobutyl ether 20%, n-octyl alcohol 15%.Hydrochloric acid is the technical hydrochloric acid of mass concentration 32%.
The low frictional resistance gel acid is prepared via a method which to obtain：
Technical hydrochloric acid, corrosion inhibiter, inhibition synergist, ferrous stability are added into liquid dispensing container by said ratio, is stirred
Mix uniformly, then add water and gelling agent, stir 22min, add cleanup additive, after being well mixed, obtain the low frictional resistance glue
Solidifying acid.
Low frictional resistance gelling acid fluid system normal temperature (when i.e. temperature is 24 DEG C) apparent viscosity is 40mPa.s, 155 DEG C,
170s-1Under the conditions of, acid liquid viscosity is 19mPa.s after shearing 60min, disclosure satisfy that the shear strength of acid solution in high temperature deep well will
Ask.Dynamic Corrosion speed as little as 40.1g/m of the low frictional resistance gel acid to N80 steel discs2.h, the anti-of the low frictional resistance gel acid is illustrated
It is rotten functional.For the low frictional resistance gel acid compared with the clear water frictional resistance under identical caliber, discharge capacity, resistance-reducing yield is more than 63%, meets
The lower deep-well construction requirement of 155 DEG C of well temperature.
Embodiment 4
A kind of low frictional resistance gel acid is present embodiments provided, the low frictional resistance gel acid includes the group of following percentage by weight
Point：Gelling agent：0.3%；Corrosion inhibiter：2%；Inhibition synergist：0.5%；Ferrous stability：1%；Cleanup additive：1%；Hydrochloric acid：
19%；Surplus is water.
The low frictional resistance gel acid is prepared via a method which to obtain：
Technical hydrochloric acid, corrosion inhibiter, inhibition synergist, ferrous stability are added into liquid dispensing container by said ratio, is stirred
Mix uniformly, then add water and gelling agent, stir 20min, add cleanup additive, after being well mixed, obtain the low frictional resistance glue
Solidifying acid.
Low frictional resistance gelling acid fluid system normal temperature (when i.e. temperature is 23 DEG C) apparent viscosity is 27mPa.s, 130 DEG C,
170s-1Under the conditions of, acid liquid viscosity is 18mPa.s after shearing 60min, disclosure satisfy that the shear strength of acid solution in high temperature deep well will
Ask.Dynamic Corrosion speed as little as 19.6g/m of the low frictional resistance gel acid to N80 steel discs2.h, the anti-of the low frictional resistance gel acid is illustrated
It is rotten functional.For the low frictional resistance gel acid compared with the clear water frictional resistance under identical caliber, discharge capacity, resistance-reducing yield is more than 70%, meets
The lower deep-well construction requirement of 130 DEG C of well temperature.
Embodiment 5
A kind of low frictional resistance gel acid is present embodiments provided, the low frictional resistance gel acid includes the group of following percentage by weight
Point：
Gelling agent：0.45%；Corrosion inhibiter：3%；Inhibition synergist：1%；Ferrous stability：2%；Cleanup additive：2%；
Hydrochloric acid：19%；Surplus is water.
The low frictional resistance gel acid is prepared via a method which to obtain：
It is 31% technical hydrochloric acid, 30mL corrosion inhibiter, 10mL inhibitions synergist, 20mL iron ions by 617mL mass concentrations
Stabilizer is added in liquid dispensing container, is stirred, and is then added 303mL water, 4.5g gelling agents, is stirred 20min, add 20mL
Cleanup additive, after being well mixed, obtain low frictional resistance gel acid.
Low frictional resistance gelling acid fluid system normal temperature (when i.e. temperature is 24 DEG C) apparent viscosity is 42mPa.s, 160 DEG C,
170s-1Under the conditions of, acid liquid viscosity is 21mPa.s after shearing 60min, disclosure satisfy that the shear strength of acid solution in high temperature deep well will
Ask.Dynamic Corrosion speed as little as 46.5g/m of the low frictional resistance gel acid to N80 steel discs2.h, the anti-of the low frictional resistance gel acid is illustrated
It is rotten functional.For the low frictional resistance gel acid compared with the clear water frictional resistance under identical caliber, discharge capacity, resistance-reducing yield is more than 60%, meets
The lower deep-well construction requirement of 160 DEG C of well temperature.
Application Example 1
Low frictional resistance gel acid in embodiment 1 is applied to during the fracture acidizing of ST2 wells.Construction well section depth be
5382~5406m and 5573~5580m, formation temperature are 124 DEG C, pipe aperture 69.84mm.By 360m3Low frictional resistance glue
Solidifying acid is added in construction well section, as shown in Figure 2, when operational discharge capacity reaches 6m3/ min, the operation pressure (oil i.e. in accompanying drawing 2
Pressure) 85-89MPa is only needed, and test the daily output 19.9 × 104m3/d.If using gel acid of the prior art, pass through the glue
Coagulating the coefficient of friction resistance prediction operation pressure of acid then needs to reach 100-105MPa, it is seen then that the low frictional resistance gel acid that embodiment 1 provides
Resistance reducing effect is good, saves acidifying cost.
Application Example 2
Low frictional resistance gel acid in embodiment 2 is applied to during the fracture acidizing of ST1 wells.Construction well section depth be
7212~7308m, formation temperature are 160 DEG C, pipe aperture 64.72mm.By 180m3Low frictional resistance gel acid add construction well
Duan Zhong, as shown in Figure 3, when operational discharge capacity reaches 3.2-3.3m3/ min, operation pressure (oil pressure i.e. in accompanying drawing 3) only need 85-
90MPa, and test the daily output 121 × 104m3/d.If using gel acid of the prior art, pass through the frictional resistance system of the gel acid
Number prediction operation pressure then needs to reach 100-105MPa, it is seen then that the low frictional resistance gel acid resistance reducing effect that embodiment 2 provides is good
It is good, save acidifying cost.
Presently preferred embodiments of the present invention is the foregoing is only, the protection domain being not intended to limit the invention is all in this hair
Within bright spirit and principle, any modification, equivalent substitution and improvements made etc., protection scope of the present invention should be included in
Within.
Claims (9)
1. a kind of low frictional resistance gel acid, it is characterised in that the low frictional resistance gel acid includes following components in percentage by weight：
Gelling agent：0.2%-0.5%；
Corrosion inhibiter：1%-4%；
Inhibition synergist：0.1%-1%；
Ferrous stability：1%-2%；
Cleanup additive：1%-2%；
Hydrochloric acid：15%-23%；
Surplus is water；
Wherein, the gelling agent is made up of the homopolymer and chain extender of MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, and institute
Mass fraction of the chain extender in the gelling agent is stated as 0.001%~0.005%.
2. low frictional resistance gel acid according to claim 1, it is characterised in that the corrosion inhibiter be quinoline quaternary ammonium salt and/or
Mannich base quaternary ammonium salt.
3. low frictional resistance gel acid according to claim 2, it is characterised in that the inhibition synergist be propilolic alcohol and/or
Pyroantimonate.
4. low frictional resistance gel acid according to claim 1, it is characterised in that the ferrous stability is citric acid, nitrogen
At least one of river triacetic acid sodium, sodium isoascorbate.
5. low frictional resistance gel acid according to claim 1, it is characterised in that the cleanup additive includes following percentage by weight
Component：APEO 65%-75%, ethylene glycol monobutyl ether 10%-20%, n-octyl alcohol 15%-25%.
6. low frictional resistance gel acid according to claim 1, it is characterised in that the hydrochloric acid is mass concentration 30%-32%
Technical hydrochloric acid.
7. low frictional resistance gel acid according to claim 1, it is characterised in that the chain extender is polyethylene glycol diacrylate
At least one of ester, N hydroxymethyl acrylamide, N, N- methylene-bisacrylamides.
8. low frictional resistance gel acid according to claim 1, it is characterised in that the viscosity average molecular weigh of the gelling agent is more than
10000000.
9. the preparation method of the low frictional resistance gel acid described in claim 1, it is characterised in that the described method comprises the following steps：
Hydrochloric acid, corrosion inhibiter, inhibition synergist, ferrous stability are sequentially added into liquid dispensing container, stirs, then adds
Water and gelling agent, 15-25min is stirred, adds cleanup additive, after being well mixed, obtain the low frictional resistance gel acid.
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| CN110358522A (en) * | 2018-03-26 | 2019-10-22 | 中国石油化工股份有限公司 | A kind of compound resistance reduction retarded acid for deep-well acid fracturing |
| CN110540832A (en) * | 2018-05-28 | 2019-12-06 | 中国石油天然气股份有限公司 | blockage removing liquid for leakage blocking slurry and preparation method thereof |
| CN111349426A (en) * | 2018-12-21 | 2020-06-30 | 中国石油天然气股份有限公司 | Diverting acid, preparation method and application thereof |
| CN111607382A (en) * | 2019-02-25 | 2020-09-01 | 中国石油天然气股份有限公司 | Thickening acid and preparation method thereof |
| CN112480903A (en) * | 2020-11-24 | 2021-03-12 | 中国石油天然气股份有限公司 | Acid liquor preparation process |
| CN112940706A (en) * | 2021-02-03 | 2021-06-11 | 成都劳恩普斯科技有限公司 | Integrated composite acid and preparation method thereof |
| CN114106240A (en) * | 2021-12-16 | 2022-03-01 | 中国石油化工股份有限公司 | Gelling agent for degradable gelled acid system and preparation method thereof |
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| CN110358522A (en) * | 2018-03-26 | 2019-10-22 | 中国石油化工股份有限公司 | A kind of compound resistance reduction retarded acid for deep-well acid fracturing |
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| CN114181691A (en) * | 2020-09-14 | 2022-03-15 | 中国石油天然气股份有限公司 | Acid-pressing gelling acid and application thereof |
| CN114181691B (en) * | 2020-09-14 | 2023-01-10 | 中国石油天然气股份有限公司 | Acid-pressing gelling acid and application thereof |
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| CN117210216B (en) * | 2023-11-09 | 2024-01-30 | 四川大学 | Instant ultrahigh Wen Jiaoning acid resistant and preparation method thereof |
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