CN106317316B - A kind of preparation method and pressure break drag reducer of shale gas pressure break drag reducer - Google Patents
A kind of preparation method and pressure break drag reducer of shale gas pressure break drag reducer Download PDFInfo
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Abstract
The present invention relates to shale gas exploitation fracturing yield increasing fields, the shale gas pressure break drag reducer for disclosing a kind of preparation method of shale gas pressure break drag reducer and being prepared by this method, this method comprises: (1) is in the presence of water, at least partly polymerized monomer, inorganic salts, stabilizer and chelating agent is mixed, mixed solution is obtained；(2) pH value for adjusting mixed solution is 3-7；(3) initiator is added in the reaction system obtained to step (2) and remainder polymerized monomer is reacted, wherein at least partly the dosage weight ratio of polymerized monomer and remainder polymerized monomer is 1:1-20.The shale gas pressure break drag reducer that the above method of the invention is prepared has drag reduction efficiency and anti-shear performance high, the advantage that stability is good, viscosity is low, good fluidity, solution rate are fast and environmentally friendly.
Description
Technical field
The present invention relates to shale gas exploitation fracturing yield increasing fields, and in particular, to a kind of shale gas pressure break drag reducer
Preparation method and the shale gas pressure break drag reducer being prepared by this method.
Background technique
Shale gas resource is very rich, however since the permeability of shale matrix is very low (generally less than 1mD), development technique
Difficult, 90% or more shale gas well needs that more satisfactory yield could be obtained by fracturing reform.
Currently, shale gas fracture stimulation operations carry out fracture stimulation operations frequently with drag reduction water.It is in water that drag reduction hydraulic pressure, which is split,
The middle fracturing work that the additives such as a small amount of fracturing fluid drag reducer, cleanup additive, fungicide are added and are carried out as fracturing fluid.With gel pressure
Liquid difference is split, drag reduction hydraulic pressure, which is split, can be substantially reduced pressure break cost, reduce formation damage, and can obtain gel fracture cannot be real
Existing volume fracturing, to improve the exploitation yield of shale gas.
Since natural polymer loses resistance reducing performance because of degradation in acid condition, drag reducer used at present is mainly
Some synthesising macromolecule copolymers, CN103820099A disclose a kind of acid solution drag reducer and preparation method thereof, it is by propylene
Amide, 2- acrylamide-2-methylpro panesulfonic acid and long chain cation monomer polymerize in aqueous solution, dry, crushing preparation,
In application, drag reducer dissolution time is up to 1-2h, it is unable to satisfy shale gas pressure break huge discharge, the needs that big flow is prepared online.
CN103694984A discloses a kind of shale gas acid fracturing drag reducer and preparation method thereof, which passes through anti-
Prepared by phase emulsion method, a large amount of organic solvent and surfactant, this fracturing fluid drag reducer injection are contained in reversed-phase emulsion
The pollution that will cause underground water behind stratum is unable to satisfy the requirement of environmental protection.
CN102977877A also discloses a kind of shale gas pressure break drag reducer and preparation method thereof, it is in saline solution
In, acrylamide, 2- acrylamide-2-methylpro panesulfonic acid sodium and acrylic acid are caused by free radical under the protection of dispersing agent
Three kinds of monomers of sodium carry out the shale gas pressure break drag reducer and preparation method thereof that random copolymerization obtains, and this method is without organic molten
Agent, it is environmentally friendly, but cause since effective content is low to need to reach 0.2% using concentration just there is preferable resistance-reducing performance,
And 2- acrylamide-2-methylpro panesulfonic acid sodium has certain dissolubility to cause the emulsion viscosity prepared big in salt water,
It is unfavorable for practical application.
Therefore, it needs to find a kind of new shale gas pressure break drag reduction that can overcome prior art defect in the art
Agent.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies of existing technologies, a kind of drag reduction efficiency is provided and anti-shear performance is high, is stablized
Property is good, viscosity is low, good fluidity, solution rate are fast and the preparation method of environmentally friendly shale gas pressure break drag reducer and by this method
The shale gas pressure break drag reducer being prepared.
Researcher of the invention by creative experimental studies have found that: in water-water dispersion polymerization process, polymerization is single
The increase of bulk concentration causes the obtained polymer of polymerization solubility in salt water to increase, polymerization initial stage due to polymerized monomer content compared with
Height, the polymer of generation solubility with higher in salt water, polymerization system viscosity is larger, and polymerization system heat dissipation is difficult, gathers
Polymer particle cohesion, bonding, cause system viscosity unstable greatly, therefore water-water dispersin polymerization uses in current preparation method
Lower polymeric monomer concentration, obtained resulting polymer content are lower；And phase, monomer concentration are lower after polymerization, gather
It closes system viscosity to be substantially reduced, but since monomer concentration is low, polymerization speed is slow, affects production efficiency.It can be seen that poly-
Close monomer concentration plays important function in the course of the polymerization process, and reacting early period and later period has difference to want polymeric monomer concentration
Ask, and in current preparation method, polymerized monomer is added at one time in polymeric kettle, this obviously to reaction process greatly very much not
Benefit.The present inventor is based on above-mentioned discovery and completes technical solution of the present invention.
To solve the above-mentioned problems, on the one hand, the present invention provides a kind of preparation method of shale gas pressure break drag reducer, should
Method includes:
(1) in the presence of water, it will at least partly polymerized monomer, inorganic salts, stabilizer and chelating agent mix, be mixed
Close solution；
(2) pH value for adjusting mixed solution is 3-7；
(3) initiator and remainder polymerization are added in the presence of protective gas, in the reaction system that obtains to step (2)
Monomer is reacted, wherein at least partly the dosage weight ratio of polymerized monomer and remainder polymerized monomer is 1:1-20.
On the other hand, the present invention provides the shale gas pressure break drag reducer being prepared by the above method of the invention.
The shale gas pressure break drag reducer that the above method of the invention is prepared has drag reduction efficiency and anti-shear performance
Height, the advantage that stability is good, viscosity is low, good fluidity, solution rate are fast and environmentally friendly.
Pressure break drag reducer polymer content with higher provided by the invention, splendid mobility and the good feature of environmental protection
Energy；It at room temperature can be with storage-stable 3 months or more；Drag-reduction effect is obvious, the dreg reducer solution drag reducing efficiency of 0.025 weight %
Up to 78%；Pressure break reduces that production cost is cheap, raw material is easy to get, instant effect is good with drag reducer.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
On the one hand, the present invention provides a kind of preparation methods of shale gas pressure break drag reducer, this method comprises:
(1) in the presence of water, it will at least partly polymerized monomer, inorganic salts, stabilizer and chelating agent mix, be mixed
Close solution；
(2) pH value for adjusting mixed solution is 3-7；
(3) initiator and remainder polymerization are added in the presence of protective gas, in the reaction system that obtains to step (2)
Monomer is reacted, wherein at least partly the dosage weight ratio of polymerized monomer and remainder polymerized monomer is 1:1-20.
The present invention provides a kind of low viscosities, the preparation method of high solids content shale gas acid fracturing drag reducer.The party
Method introduces acid-resisting monomer, and the concentration of dynamic regulation polymerized monomer in the course of the polymerization process, slows down the dissolution of polymer in water,
Reaction cohesion early period, bonding are avoided, the effective of pressure break drag reducer greatly improved in the slow-footed disadvantage of late phase reaction, the present invention
The stability and production efficiency of stabilizer are also improved while content.The low viscosity of preparation, the stabilizer of high solids content are used for
Shale gas acid fracturing drag reducer reduces fracturing fluid liquid for shale gas acid fracturing directly with after acid dilution in the process
Frictional resistance in body flow process.
Under preferable case, in the present invention, the dosage weight of at least partly polymerized monomer and remainder polymerized monomer
Amount is than being 1:2-9.
In the present invention, on the basis of the total weight for the shale gas pressure break drag reducer being prepared, the preferably described polymerization
The dosage of monomer is 20-40 weight %, more preferably 25-35 weight %, particularly preferably 28-35 weight %.
In the present invention, preferably described inorganic on the basis of the total weight for the shale gas pressure break drag reducer being prepared
The dosage of salt is 10-35 weight %, more preferably 20-30 weight %, particularly preferably 22-28 weight %.
In the present invention, on the basis of the total weight for the shale gas pressure break drag reducer being prepared, the preferably described stabilization
The dosage of agent is 0.1-2 weight %, more preferably 0.5-1 weight %；Particularly preferably 0.6-0.9 weight %.
In the present invention, on the basis of the total weight for the shale gas pressure break drag reducer being prepared, the preferably described chelating
The dosage of agent is 0.001-0.5 weight %, more preferably 0.01-0.1 weight %, particularly preferably 0.04-0.06 weight %.
According to the present invention, on the basis of the total weight of the pressure break drag reducer finally prepared, the dosage of the initiator is
0.0001-0.05 weight %, preferably 0.001-0.01 weight %, more preferably 0.005-0.008 weight %.
According to the present invention, the initiator can be redox system initiator or azo-initiator, the oxidation
In reduction system initiator oxidant can in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate and hydrogen peroxide at least one
Kind, it is preferable that the oxidant is ammonium persulfate.Reducing agent can be selected from bisulfite in the redox system initiator
Sodium, sodium sulfite, sodium bisulphite formaldehyde (rongalite), sodium thiosulfate, ferrous sulfate and sodium dithionite (sodium hydrosulfite)
At least one of, it is preferable that the reducing agent is sodium hydrogensulfite.The azo-initiator can be selected from two isobutyl of azo
The double methylpent hydrochlorates of nitrile, azobisisoheptonitrile, azo, 2,2 '-azo diisobutyl amidine hydrochlorides, two isobutyl imidazoline salt of azo
Hydrochlorate and 2, at least one of 2 '-azos two [2- (2- imidazoline -2- propane)-dihydrochloride], it is preferable that the initiator
For two isobutyl imidazoline hydrochloride of azo.
In the present invention, it is preferred to which the polymerization reaction carries out in the presence of auxiliary agent, the auxiliary agent is selected from chelating agent, chain extender
With one of other auxiliary agents or a variety of；The chelating agent is selected from disodium ethylene diamine tetraacetate, triethylenediamine pentaacetic acid, lemon
At least one of acid, citrate and poly- hydroxy acrylic acid；The chain extender is selected from N, N '-dimethyl ethylenediamine, N, N, N ',
N '-tetramethylethylenediamine, N, N- dimethyl amine, 3- methylamino propylamine, N, N '-dimethyl -1,3- propane diamine, 1- (dimethyl
Amino) at least one of -2- propylamine and diethylenetriamines；Other auxiliary agents are selected from urea, sodium formate, isopropanol and secondary
At least one of sodium phosphate.
When needing that sour regulation system pH value is added, the acid is preferably inorganic acid, and the inorganic acid can be hydrochloric acid, sulphur
At least one of acid, sulfonic acid, nitric acid and phosphoric acid.When needing to be added alkali regulation system pH value, the alkali can be inorganic base
Or organic amine compound, it can such as be selected from sodium hydroxide, potassium hydroxide, ammonium hydroxide, methylamine, ethamine, ethanol amine and triethanolamine
At least one of, preferably sodium hydroxide.
According to the present invention, the chelating agent is preferably disodium ethylene diamine tetraacetate.
According to the present invention, the inorganic salts are preferably water-soluble inorganic salt, and the water-soluble inorganic salt can be sodium salt, ammonium
At least one of salt and magnesium salts；Preferably, the water-soluble inorganic salt is at least one in ammonium sulfate, sodium sulphate and magnesium sulfate
Kind；It is highly preferred that the water-soluble inorganic salt is ammonium sulfate.
In the present invention, it is preferred to which the non-ionic monomer is acrylamide and/or Methacrylamide.
In the present invention, it is preferred to which the anionic monomer is acrylic acid and/or methacrylic acid.
In the present invention, with the total weight of the polymerized monomer, the content of the preferably described non-ionic monomer is 80-99 weight
Measure %, more preferably 85-95 weight %.
In the present invention, with the total weight of the polymerized monomer, the content of the preferably described cationic monomer is 1-20 weight
Measure %, more preferably 5-15 weight %.
Under preferable case, in the present invention, the stabilizer is poly- 2- acrylamide-2-methylpro panesulfonic acid sodium, described
The viscosity average molecular weigh of stabilizer is 100,000-50 ten thousand.
In the present invention, in step (3), the condition of the preferably described reaction includes: that reaction temperature is 20-70 DEG C, reaction
Time is 2-8h.
In the case of in the present invention, it is preferred to, on the basis of the total weight for the shale gas pressure break drag reducer being prepared, institute
The dosage for stating initiator is 0.0001-0.05 weight %.
In the present invention, in more preferred situation, using the total weight for the shale gas pressure break drag reducer being prepared as base
Standard, the dosage of the initiator are 0.001-0.01 weight %, particularly preferably 0.005-0.008 weight %.
In the case of in the present invention, it is preferred to, method of the invention further includes obtaining step (2) before step (3)
Reaction solution is warming up to 20-70 DEG C, and logical protective gas is to be discharged the oxygen in reaction solution.
A kind of preferred embodiment according to the present invention, the method comprise the steps that
(1) it will at least partly polymerized monomer, inorganic salts, stabilizer, chelating agent and deionized water mix, the mixing that will be obtained
Liquid NaOH aqueous solution adjusts pH value to 3-7；
(2) reaction solution that step (1) obtains is warming up to 20-70 DEG C, leads to the oxygen in nitrogen discharge reaction solution；
(3) it is stirred to react 2-8h under nitrogen protection, and during the reaction divides initiator and remaining polymerized monomer extremely
In few primary addition reaction system.
On the other hand, the present invention provides the shale gas pressure break drag reducer being prepared by the above method of the invention.
The present invention will be described in detail by way of examples below.
According to the present invention, in following embodiment, the resistance reducing performance test condition of pressure break drag reducer is as follows: pressure break drag reduction
The resistance reducing performance test of agent is measured by pressure break drag reducer measurement device, and condition is as follows: under room temperature, pressure break drag reducer is added molten
Tank is solved, after ten minutes, solution enters test section through spinner flowmeter by pump conveying outflow for stirring.It is measured and is flowed with spinner flowmeter
Amount, uninterrupted measure pressure drop of the solution by test section by Frequency Converter Control.Round tube diameter 0.635cm is tested, pipeline section is tested
Length is 3m, and the concentration of pressure break drag reducer in deionized water is 0.1 weight %, and drag reducing efficiency (DR) is calculated as follows:
Wherein, Δ P0For deionized water pressure drop, unit Pa；Δ P be pressure break dreg reducer solution with water-soluble liquid phase
Pressure drop under same Reynolds constant, unit Pa.
Acrylamide used in the present invention, chemistry is pure, is purchased from Shandong Polymer Bio-Chemicals Co., Ltd.；Made
Acrylic acid, chemistry is pure, is purchased from Sinopharm Chemical Reagent Co., Ltd.；Used ammonium sulfate, chemistry is pure, is purchased from Tianjin
Recover fine chemistry industry research institute；Used two isobutyl imidazoline hydrochloride of azo, 2,2 '-azo diisobutyl amidine hydrochlorides with
And the double methylpent hydrochlorates of azo are purchased from aldrich.
Embodiment 1
The present embodiment is used to illustrate the preparation method and the preparation present invention of shale gas pressure break drag reducer of the present invention
The shale gas pressure break drag reducer.
In the 1.5L four-hole bottle equipped with condenser pipe, temperature controller, constant speed mechanical agitator, nitrogen inlet and constant pressure addition device
Deionized water 405g, ammonium sulfate 280g, acrylamide 85.5g, acrylic acid 4.5g, poly- 2- acrylamido -2- methyl-prop is added
Sodium sulfonate 9g (molecular weight 100,000), disodium ethylene diamine tetraacetate 0.4g, 30 weight % potassium hydroxide 5.5g, stirring keep solid complete
35 DEG C are warming up to after dissolution；Logical nitrogen is after 30 minutes；2,2 '-azo diisobutyl amidine hydrochloride 0.05g are added, continue logical nitrogen
Gas, and in remaining acrylamide (199.5g) and acrylic acid (10.5g) are added in polymeric kettle in 3 hours, reaction terminates
The milky dispersion liquid that apparent viscosity is 375 mPa.s is obtained afterwards, it at room temperature can be with storage-stable 6 months or more.
Comparative example 1
It is identical to prepare the method for pressure break drag reducer with embodiment 1, the difference is that propylene in the preparation method
Amide and acrylic acid are all disposably put into polymeric kettle；As a result it is sticky to obtain the milky that apparent viscosity is 48000 mPa.s
Liquid.
Embodiment 2
The present embodiment is used to illustrate the preparation method and the preparation present invention of shale gas pressure break drag reducer of the present invention
The shale gas pressure break drag reducer.
In the 1.5L four-hole bottle equipped with condenser pipe, temperature controller, constant speed mechanical agitator, nitrogen inlet and constant pressure addition device
Deionized water 455.5g, ammonium sulfate 220g, acrylamide 25.5g, acrylic acid 4.5g, poly- 2- acrylamido -2- methyl is added
Propanesulfonate 6g (molecular weight 300,000), disodium ethylene diamine tetraacetate 0.6g, 30 weight % sodium hydroxide 16.5g, stirring make solid
55 DEG C are warming up to after being completely dissolved；Logical nitrogen is after 30 minutes；2,2 '-azo diisobutyl amidine hydrochloride 0.08g are added, continue to lead to
Nitrogen, and in remaining acrylamide (229.5g) and acrylic acid (40.5g) are added in polymeric kettle in 6 hours, reaction is tied
The milky dispersion liquid that apparent viscosity is 395 mPa.s is obtained after beam, it at room temperature can be with storage-stable 6 months or more.
Embodiment 3
The present embodiment is used to illustrate the preparation method and the preparation present invention of shale gas pressure break drag reducer of the present invention
The shale gas pressure break drag reducer.
In the 1.5L four-hole bottle equipped with condenser pipe, temperature controller, constant speed mechanical agitator, nitrogen inlet and constant pressure addition device
Deionized water 443g, ammonium sulfate 240g, acrylamide 27g, acrylic acid 3g, poly- 2- acrylamide-2-methylpro panesulfonic acid is added
Sodium 8g (molecular weight 200,000), disodium ethylene diamine tetraacetate 0.5g, 30 weight % sodium hydroxide 8.5g, stirring are completely dissolved solid
After be warming up to 35 DEG C；Logical nitrogen is after 30 minutes；2,2 '-azo diisobutyl amidine hydrochloride 0.07g are added, continue logical nitrogen, and
In remaining acrylamide (243g) and acrylic acid (27g) are added in polymeric kettle in 4.5 hours, table is obtained after reaction
The milky dispersion liquid that viscosity is 305 mPa.s is seen, it at room temperature can be with storage-stable 6 months or more.
Embodiment 4
The present embodiment is used to illustrate the preparation method and the preparation present invention of shale gas pressure break drag reducer of the present invention
The shale gas pressure break drag reducer.
In the 1.5L four-hole bottle equipped with condenser pipe, temperature controller, constant speed mechanical agitator, nitrogen inlet and constant pressure addition device
Deionized water 443g, ammonium sulfate 240g, acrylamide 31.5g, acrylic acid 3.5g, poly- 2- acrylamido -2- methyl-prop is added
Sodium sulfonate 8g (molecular weight 200,000), disodium ethylene diamine tetraacetate 0.5g, 30 weight % sodium hydroxide 8.5g, stirring keep solid complete
35 DEG C are warming up to after dissolution；Logical nitrogen is after 30 minutes；2,2 '-azo diisobutyl amidine hydrochloride 0.07g are added, continue logical nitrogen
Gas, and in remaining acrylamide (283.5g) and acrylic acid (31.5g) are added in polymeric kettle in 4.5 hours, reaction is tied
The milky dispersion liquid that apparent viscosity is 465 mPa.s is obtained after beam, it at room temperature can be with storage-stable 6 months or more.
Embodiment 5
In the 1.5L four-hole bottle equipped with condenser pipe, temperature controller, constant speed mechanical agitator, nitrogen inlet and constant pressure addition device
Deionized water 405g, ammonium sulfate 280g, acrylamide 19g, acrylic acid 1g, poly- 2- acrylamide-2-methylpro panesulfonic acid is added
Sodium 9g (molecular weight 100,000), disodium ethylene diamine tetraacetate 0.4g, 30 weight % potassium hydroxide 5.5g, stirring are completely dissolved solid
After be warming up to 35 DEG C；Logical nitrogen is after 30 minutes；2,2 '-azo diisobutyl amidine hydrochloride 0.05g are added, continue logical nitrogen, and
In remaining acrylamide (266g) and acrylic acid (14g) are added in polymeric kettle in 3 hours, obtain after reaction apparent
Viscosity is the milky dispersion liquid of 623 mPa.s, at room temperature can be with storage-stable 6 months or more.
Embodiment 6
In the 1.5L four-hole bottle equipped with condenser pipe, temperature controller, constant speed mechanical agitator, nitrogen inlet and constant pressure addition device
Deionized water 455.5g, ammonium sulfate 220g, acrylamide 127.5g, acrylic acid 22.5g, poly- 2- acrylamido -2- first is added
Base propanesulfonate 6g (molecular weight 300,000), disodium ethylene diamine tetraacetate 0.6g, 30 weight % sodium hydroxide 16.5g, stirring make solid
Body is warming up to 55 DEG C after being completely dissolved；Logical nitrogen is after 30 minutes；2,2 '-azo diisobutyl amidine hydrochloride 0.08g are added, continue
Logical nitrogen, and in remaining acrylamide (127.5g) and acrylic acid (22.5g) are added in polymeric kettle in 6 hours, it reacts
After obtain apparent viscosity be 597 mPa.s milky dispersion liquid, at room temperature can be with storage-stable 6 months or more.
EXPERIMENTAL EXAMPLE
This EXPERIMENTAL EXAMPLE to the fracturing fluid drag reducer that illustrates to prepare in embodiment 1-6 and comparative example 1 in water
Drag-reduction effect.
The drag reducing efficiency (DR%) of the pressure break drag reducer prepared in testing example 1-6 and comparative example 1 respectively, as a result such as
Shown in table 1.
Table 1
From it was found from the data in table 1: in embodiment 1-4, the drag reduction of fracturing fluid drag reducer prepared by the present invention in water
Rate is up to 78.6%, is only 0.025 weight t% in concentration since fracturing fluid drag reducer effective concentration prepared by the present invention is high
Resistance-reducing efficiency still with higher, for 3 sample of embodiment when concentration is 0.025 weight %, resistance-reducing yield still reaches 78%, and uses
Tradition is added at one time the preparation method of monomer, since obtained product is sticky, dissolves after ten minutes only a small amount of dissolution in water,
Resistance-reducing yield is only 8.4%, even if reach 0.1 weight % using concentration, resistance-reducing yield still only has 9.6%, does not have industrial application
Value.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (14)
1. a kind of preparation method of shale gas pressure break drag reducer, this method comprises:
(1) in the presence of water, it will at least partly polymerized monomer, inorganic salts, stabilizer and chelating agent mix, and obtain mixing molten
Liquid；
(2) pH value for adjusting mixed solution is 3-7；
(3) in the presence of protective gas, initiator and remainder polymerized monomer are added in the reaction system that obtains to step (2)
It is reacted, wherein at least partly the dosage weight ratio of polymerized monomer and remainder polymerized monomer is 1:1-20, wherein institute
Stating polymerized monomer includes non-ionic monomer and/or anionic monomer；
On the basis of the total weight for the shale gas pressure break drag reducer being prepared, the dosage of the inorganic salts is 10-35 weight
Measure %；
The inorganic salts are ammonium sulfate.
2. according to the method described in claim 1, wherein, the use of at least partly polymerized monomer and remainder polymerized monomer
Amount weight ratio is 1:2-9.
3. method according to claim 1 or 2, wherein with the total weight for the shale gas pressure break drag reducer being prepared
On the basis of, the dosage of the polymerized monomer is 20-40 weight %；The dosage of the stabilizer is 0.1-2 weight %；The chelating
The dosage of agent is 0.001-0.5 weight %.
4. according to the method described in claim 3, wherein, using the total weight for the shale gas pressure break drag reducer being prepared as base
Standard, the dosage of the polymerized monomer are 25-35 weight %；The dosage of the inorganic salts is 20-30 weight %；The stabilizer
Dosage is 0.5-1 weight %；The dosage of the chelating agent is 0.01-0.1 weight %.
5. according to the method described in claim 1, wherein, the non-ionic monomer is acrylamide and/or Methacrylamide,
The anionic monomer is acrylic acid and/or methacrylic acid.
6. according to the method described in claim 4, wherein, with the total weight of the polymerized monomer, the non-ionic monomer
Content is 80-99 weight %；The content of the anionic monomer is 1-20 weight %.
7. according to the method described in claim 6, wherein, with the total weight of the polymerized monomer, the non-ionic monomer
Content is 85-95 weight %；The content of the anionic monomer is 5-15 weight %.
8. method according to claim 1 or 2, wherein the stabilizer is poly- 2- acrylamide-2-methylpro panesulfonic acid
Sodium, the viscosity average molecular weigh of the stabilizer are 100,000-50 ten thousand.
9. method according to claim 1 or 2, wherein in step (3), the condition of the reaction includes: reaction temperature
It is 20-70 DEG C, reaction time 2-8h.
10. method according to claim 1 or 2, wherein with the total weight for the shale gas pressure break drag reducer being prepared
On the basis of, the dosage of the initiator is 0.0001-0.05 weight %.
11. according to the method described in claim 10, wherein, the total weight with the shale gas pressure break drag reducer being prepared is
Benchmark, the dosage of the initiator are 0.001-0.01 weight %.
12. according to the method for claim 11, wherein the total weight with the shale gas pressure break drag reducer being prepared is
Benchmark, the dosage of the initiator are 0.005-0.008 weight %.
13. according to the method described in claim 1, wherein, this method further includes obtaining step (2) before step (3)
Reaction solution is warming up to 20-70 DEG C, and logical protective gas is to be discharged the oxygen in reaction solution.
14. the shale gas pressure break drag reducer that method described in any one of claim 1-13 is prepared.
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| CN104250339B (en) * | 2013-06-28 | 2016-05-25 | 中国石油化工股份有限公司 | A kind of acrylamide based copolymer and its preparation method and application |
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| CN102993359A (en) * | 2011-09-14 | 2013-03-27 | 何林荣 | Acid liquor thickener preparation technique based on control on monomer total concentration |
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