CN106433600A - Seawater-based thickening agent for fracturing as well as preparation method and application thereof - Google Patents
Seawater-based thickening agent for fracturing as well as preparation method and application thereof Download PDFInfo
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- CN106433600A CN106433600A CN201610802025.2A CN201610802025A CN106433600A CN 106433600 A CN106433600 A CN 106433600A CN 201610802025 A CN201610802025 A CN 201610802025A CN 106433600 A CN106433600 A CN 106433600A
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- 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
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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Abstract
The invention discloses a seawater-based thickening agent for fracturing as well as a preparation method and application thereof and belongs to the technical field of oil field chemistry. The thickening agent is a copolymer of five monomers including acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone, methacrylatoethyl trimethyl ammonium chloride and methacrylic acid at the weight ratio of (45 to 60) to (12 to 18) to (3 to 9) to (6 to 12) to (6 to 9). The thickening agent can be directly used for preparing fluid with seawater and prepared base fluid can be crossly linked with an organic metal salt cross-linking agent so as to form gelled fracturing fluid with excellent temprature resisting, salt resisting and shearing resisting performances; the technical problems in the prior art that an existing thickening agent can only used for a freshwater system and cannot be directly used for preparing the fracturing fluid through utilizing the seawater so that the offshore fracturing construction is limited are solved.
Description
Technical field
The present invention relates to technical field of oilfield chemistry, particularly to a kind of pressure break seawater base thickening agent and preparation method thereof
And application.
Background technology
Geological prospecting shows, contains abundant petroleum resources in ocean, and the Marine oil and gas resource of China is still in exploitation
Commitment.The permeability of oil-gas Layer and fracturing technique is the Main Yield-increasing measure of oil-gas reservoir, can be improved, play volume increase and increase
The effect of note.
The fresh water pressure break system that China's ocean pressure break still follows conventional lines at present is constructed, by construction operation carrier, base fluid
Storage area, the restriction of fresh water transport, ocean pressing crack construction scale is greatly limited, and is subject to the shadow of multiple objective factors simultaneously
Ring, fresh water supply is difficult to ensure that, has had a strong impact on duty cycle, has also increased cost input.Offshore oil and gas field have take no
Most seawater resources are it is adaptable to now with the current continuously join liquid form of construction work with pressure with joining, but because seawater degree of calcification is high, existing
Thickening agent can only be used to fresh water system it is impossible to directly be prepared with seawater.
Therefore develop a kind of thickening agent that directly can join liquid with seawater, contribute to overcoming marine pressing crack construction to fresh water
Rely on, contribute to breaking through the restriction in operation on the sea space, the cost of marine pressing crack construction can be substantially reduced, can be for expanding marine pressure
Splitting scope of construction item provides technical support.
Content of the invention
It is an object of the invention to provide a kind of pressure break seawater base thickening agent and its preparation method and application, this thickening agent energy
Directly prepare fracturing fluid with seawater preparation, formed and there is superior heatproof, salt tolerant, the gelled fracturing fluid of resistant to shearing performance, reduce
Marine pressure break cost, provides technical support for expanding marine pressing crack construction scale.
On the one hand, for achieving the above object, the invention provides a kind of pressure break seawater base thickening agent, described thickening agent is
Acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl trimethyl ammonia chloride
Ammonium, the copolymer of five kinds of monomers of methacrylic acid, its weight is than for 45～60:12～18:3～9:6～12:6～9.
Further, the relative molecular mass of described copolymer is between 6,500,000～9,000,000.
On the other hand, the invention provides a kind of pressure break preparation method of seawater base thickening agent, including：
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid by weight 45～60:12～18:3～9:6～12:6～9 mixing, obtain
Mix monomer, described mix monomer is mixed with a certain amount of distilled water, obtains mixed monomer solution, molten in described mix monomer
In liquid, the concentration of mix monomer is 25%～35%；
Add chain-transferring agent in described mixed monomer solution, and adjust solution ph in the range of 6.5～7.0, maintain
Reaction initial temperature is at 20 DEG C～30 DEG C；
To in the mixed monomer solution add chain-transferring agent, logical inert gas removes oxygen in water, is subsequently adding initiation
Agent, obtains reaction system, continues to lead to inert gas in described reaction system, and keeps described reaction system airtight, at 20 DEG C
～30 DEG C of trigger monomer polymerizations；
After trigger monomer polymerization, exothermic heat of reaction makes temperature of reaction system rise to 80 DEG C～90 DEG C, is incubated at this temperature
Fully react, obtain copolymer, described copolymer obtains pressed powder after granulating, be dried, pulverizing, and described pressed powder is
Described thickening agent.
Further, the addition of described chain-transferring agent is the 0.15%～0.3% of described mixed monomer solution gross mass.
Further, described chain-transferring agent is one of sodium formate, potassium formate, urea or two kinds.
Further, the addition of described initiator is the 0.005%～0.05% of described mixed monomer solution gross mass.
Further, described initiator is redox composite initiation system, in described redox composite initiation system
Oxidant is one of ammonium persulfate, potassium peroxydisulfate, and reducing agent is one of sodium sulfite, sodium hydrogensulfite；Wherein, institute
State the weight of oxidant and described reducing agent than for 2:1.
Further, the described reaction system insulation reaction time is 2h.
Further, the relative molecular mass of described copolymer is between 6,500,000～9,000,000.
On the other hand, the invention provides application in seawater-based fracturing fluid for the described thickening agent.
One or more of embodiment of the present invention technical scheme, at least has the following technical effect that or advantage：
The pressure break seawater base thickening agent that the present invention provides, can directly carry out joining liquid with seawater, and the base fluid of preparation can be with
Cross-linking agents, form gelled fracturing fluid, frozen glue has higher viscoplasticity, have at 150 DEG C good heatproof, salt tolerant,
Resistant to shearing performance, meets the technical need of marine pressure break reservoir reconstruction, reduces marine pressure break cost.
Brief description
Fig. 1 is the preparation method flow chart of pressure break seawater base thickening agent in the embodiment of the present invention；
Fig. 2 is the rheological curve at 150 DEG C for the seawater-based fracturing fluid of the thickening agent preparation of the embodiment of the present invention 1；
Fig. 3 is the rheological curve at 150 DEG C for the seawater-based fracturing fluid of the thickening agent preparation of the embodiment of the present invention 2；
Fig. 4 is the rheological curve at 150 DEG C for the seawater-based fracturing fluid of the thickening agent preparation of the embodiment of the present invention 3；
Fig. 5 is the rheological curve at 150 DEG C for the seawater-based fracturing fluid of the thickening agent preparation of the embodiment of the present invention 4.
Specific embodiment
The embodiment of the present invention is passed through to provide a kind of pressure break seawater base thickening agent and its preparation method and application, solves existing
Thickening agent is had to can only be used to fresh water system it is impossible to directly prepare fracturing fluid with seawater preparation, so that marine pressing crack construction is subject to
The technical problem limiting；This thickening agent at sea directly can join liquid with seawater, and the technology meeting marine pressure break reservoir reconstruction needs
Ask.
For solving above-mentioned technical problem, embodiment of the present invention general thought is as follows：
The invention provides a kind of pressure break seawater base thickening agent, described thickening agent is acrylamide (AM), 2- acryloyl
Amine -2- methyl propane sulfonic acid (AMPS), NVP (NVP), MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride
(DMC), the copolymer of methacrylic acid (MAA) five kinds of monomers, its weight is than for 45～60:12～18:3～9:6～12:6～
9.
Be can be seen that in this thickening agent building-up process by above content, add appropriate monomer DMC, AMPS and NVP, tool
There are salt resistance, resistance to high salinity and hydrolysis, therefore this thickening agent directly can carry out joining liquid with seawater, and the base fluid of preparation can
With with organic metal salt cross-linking agents, formed there is superior heatproof, salt tolerant, the gelled fracturing fluid of resistant to shearing performance, solve
Existing thickening agent present in prior art can only be used to fresh water system it is impossible to directly prepare fracturing fluid with seawater preparation, thus
Make the technical problem that marine pressing crack construction is restricted.
In order to be better understood from technique scheme, below by accompanying drawing and specific embodiment to technical solution of the present invention
It is described in detail it should be understood that the specific features in the embodiment of the present invention and embodiment are detailed to technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the case of not conflicting, the embodiment of the present invention and embodiment
In technical characteristic can be combined with each other.
On the one hand, embodiments provide a kind of pressure break seawater base thickening agent, described thickening agent is acrylamide
(AM), 2- acrylamide-2-methyl propane sulfonic (AMPS), NVP (NVP), methylacryoyloxyethyl front three
Ammonium chloride (DMC), the copolymer of methacrylic acid (MAA) five kinds of monomers, its weight is than for 45～60:12～18:3～9:6
～12:6～9.
Because the salinity of seawater is higher, typically in 35000mg/L about, only when 2- acrylamide -2- methyl-prop sulphur
Sour (AMPS), NVP (NVP) and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride (DMC) these three salt tolerants,
When the dosage of the monomer of resistance to gentle resistant to hydrolysis reaches a certain amount, the frozen glue being cross-linked to form could show superior at high temperature
Resistant to shearing performance, but its dosage is not The more the better, and dosage is excessive and gel-forming property that can affect thickening agent.Therefore, through comprehensive
Close and consider the weight determining five kinds of monomers of AM, AMPS, NVP, DMC, MAA ratio for 45～60:12～18:3～9:6～12:6～9.
In actual application, the parts by weight of AM can be 45,50,55,60；AMPS parts by weight can for 12,14,
16、18；The parts by weight of NVP can be 3,6,9；The parts by weight of DMC can be 6,8,10,12；The parts by weight of MAA are permissible
For 6,7,8,9.
Preferably, the relative molecular mass of described copolymer is between 6,500,000～9,000,000.When thickening agent molecular weight reaches
When more than 6500000, after crosslinking, frozen glue has higher viscoplasticity, and excellent solid-carrying performance；But when thickening agent molecular weight continues
Continuous increase, after 9,000,000, base fluid viscosity increases, and during live pressure break suction, pump pressure is larger, is unfavorable for site operation.
On the other hand, based on same inventive concept, embodiments provide a kind of preparation method of above-mentioned thickening agent,
Referring to Fig. 1, including：
Step S101：By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, metering system
Acyloxyethyl trimethyl ammonium chloride, five kinds of monomers of methacrylic acid by weight 45～60:12～18:3～9:6～12:6～9
Mixing, obtains mix monomer, described mix monomer is mixed with a certain amount of distilled water, obtains mixed monomer solution, described
In mixed monomer solution, the mass concentration of mix monomer is 25%～35%；
Wherein, when mix monomer concentration is less than 25%, after five kinds of monomers are caused, production is flowable state viscous fluid
Body, is hardly formed the blob of viscose with some strength, is unfavorable for the granulation in later stage, is dried；If mix monomer concentration is excessive, cause anti-
At once, exothermic heat of reaction is too fast, and radiating is relatively slow, easily causes implode, is unfavorable for the control of thickening agent molecular weight and performance.Therefore,
The mass concentration controlling mix monomer is 25%～35%.
Step S102：Add chain-transferring agent in described mixed monomer solution, and adjust solution ph to 6.5～7.0 models
In enclosing, maintain reaction initial temperature at 20 DEG C～30 DEG C；
Wherein, adjust solution ph with alkali, specifically chosen NaOH, during practical application, being formulated as mass concentration is
20% sodium hydroxide solution.Due to containing carbonate or bicarbonate ion in sodium carbonate and sodium acid carbonate, easy and crosslinking agent
In metal ion formed carbonate deposition, be unfavorable for crosslinking, therefore should not select.Therefore the embodiment of the present invention selects NaOH
Adjust solution ph.
Described chain-transferring agent is used for adjusting the molecular weight of polymer, and its addition is described mixed monomer solution gross mass
0.15%～0.3%, to regulate and control the molecular weight of polymer in the range of 6,500,000～9,000,000.
Described chain-transferring agent is one of sodium formate, potassium formate, urea or two kinds.
Step S103：To in the mixed monomer solution add chain-transferring agent, logical inert gas removes oxygen in water, then
Add initiator, obtain reaction system, continue to lead to inert gas in described reaction system, and keep described reaction system close
Close, be polymerized in 20 DEG C～30 DEG C trigger monomers；
Wherein, described initiator is used for trigger monomer polymerization, on the one hand, its addition is very few, is not enough to trigger monomer and gathers
Close or rate of polymerization is slow, on the other hand, addition is excessive, can cause that rate of polymerization is too fast, polymerization system is unstable, therefore really
Fixed suitable addition is the 0.005%～0.05% of described mixed monomer solution gross mass.
In the embodiment of the present invention, initiator is redox composite initiation system, described redox composite initiation system
Middle oxidant is one of ammonium persulfate, potassium peroxydisulfate, and reducing agent is one of sodium sulfite, sodium hydrogensulfite；Wherein,
The weight of described oxidant and described reducing agent is than for 2:1.
Described inert gas includes but is not limited to：Nitrogen, argon gas.Wherein, in polymerization process, to lead to in solution
Enter enough inert gases, to remove the dissolved oxygen in solution, the time is generally 10min～20min, then in inert gas
Protection is lower to add initiator, and keeps reaction vessel airtight.If it is not enough to be passed through amount of inert gas, may be difficult to cause polymerization,
Or cause the phase long, or lead to thickening agent molecular weight low.If failing for a long time to cause polymerization, initial drawing can be added in solution
Send out agent, and logical inert gas 10min, to cause polymerization.
Step S104：After trigger monomer polymerization, exothermic heat of reaction makes temperature of reaction system rise to 80 DEG C～90 DEG C, here temperature
It is incubated under degree and fully reacts, obtain copolymer, described copolymer obtains pressed powder after granulating, be dried, pulverizing, described solid
Powder is described thickening agent.
After trigger monomer polymerization wherein in step S104, exothermic heat of reaction, after making temperature of reaction system rise to 80 DEG C～90 DEG C,
It is considered as causing successfully, now records the time, insulation at this temperature makes monomer reaction completely, preferred reaction time is 2h.
The relative molecular mass of the copolymer that the embodiment of the present invention obtains, between 6,500,000～9,000,000, mainly passes through to adjust
The control addition of chain-transferring agent, monomer concentration, initiator concentration, initial temperature are realizing.By changing above-mentioned parameter, obtain
The thickening agent of molecular weight, the thickening agent molecular weight obtained by general copolymerization be about 6,600,000～7,100,000,7,200,000～7,700,000,
7900000～8,400,000,8,500,000～8,900,000.
On the other hand, based on same inventive concept, embodiments provide described thickening agent in seawater-based fracturing fluid
In application.
Specifically, described thickening agent can directly carry out joining liquid with seawater, and the base fluid of preparation can be crosslinked with organic metal salt
Agent, such as organic zirconium, organic titanium, Organic Chromium etc. carry out crosslinking, form the frozen glue pressure with superior heatproof, salt tolerant, resistant to shearing performance
Split liquid.
In order that those skilled in the art can further understand the scheme of the embodiment of the present invention, with reference to tool
The example of body, is illustrated to technical scheme.
Embodiment 1
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid are according to 55:15:5:10:6 weight, than adding in distilled water, is configured to list
Bulk concentration is 32% solution.Under agitation add 0.3% urea as chain-transferring agent, logical nitrogen 20min, Ran Houjia
(ammonium persulfate and sodium sulfite, weight is than for 2 to enter 0.01% redox initiator:1), stir, cause at 25 DEG C
Polymerization.When temperature is warming up to more than 85 ± 5 DEG C, record the time, be incubated 2h, obtain the transparent blob of viscose with certain degree of hardness.
The blob of viscose being polymerized is carried out granulating, dry, pulverize into 60 mesh, obtains the thickening agent of white solid powder shape, note
For numbering GC-5101.
Embodiment 2
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid are according to 55:16.5:5:9:7.5 weight, than adding in distilled water, is configured to
Monomer concentration is 32% solution.Under agitation add 0.25% urea as chain-transferring agent, logical nitrogen 20min, so
After add 0.02% redox initiator (ammonium persulfate and sodium hydrogensulfite, weight be than for 2:1), stir, at 25 DEG C
Lower initiation is polymerized.When temperature is warming up to more than 85 ± 5 DEG C, record the time, be incubated 2h, obtain the transparent adhesive tape with certain degree of hardness
Block.
The blob of viscose being polymerized is carried out granulating, dry, pulverize into 60 mesh, obtains the thickening agent of white solid powder shape, note
For numbering GC-5102.
Embodiment 3
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid are according to 50:14:6:8:8 weight, than adding in distilled water, is configured to monomer
Concentration is 28% solution.Under agitation add 0.20% urea as chain-transferring agent, logical nitrogen 20min, Ran Houjia
(potassium peroxydisulfate and sodium sulfite, weight is than for 2 to enter 0.03% redox initiator:1), stir, cause at 25 DEG C
Polymerization.When temperature is warming up to 85 ± 5 DEG C, record the time, be incubated 2h, obtain the transparent blob of viscose with certain degree of hardness.
The blob of viscose being polymerized is carried out granulating, dry, pulverize into 60 mesh, obtains the thickening agent of white solid powder shape, note
For numbering GC-5103.
Embodiment 4
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid are according to 50:16:6:10:8 weight, than adding in distilled water, is configured to list
Bulk concentration is 30% solution.Under agitation add 0.20% urea as chain-transferring agent, logical nitrogen 20min, then
(ammonium persulfate and sodium sulfite, weight ratio is for 2 to add 0.015% redox initiator:1), stir, at 25 DEG C
Cause polymerization.When temperature is warming up to 85 ± 5 DEG C, record the time, be incubated 2h, obtain the transparent blob of viscose with certain degree of hardness.
The blob of viscose being polymerized is carried out granulating, dry, pulverize into 60 mesh, obtains the thickening agent of white solid powder shape, note
For numbering GC-5104.
Embodiment 5
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid are according to 60:18:9:12:9 weight, than adding in distilled water, is configured to list
Bulk concentration is 35% solution.Under agitation add 0.30% sodium formate as chain-transferring agent, logical nitrogen 20min, so
(potassium peroxydisulfate and sodium hydrogensulfite, weight ratio is for 2 to add 0.05% redox initiator afterwards:1), stir, 20
Cause polymerization at DEG C.When temperature is warming up to 85 ± 5 DEG C, record the time, be incubated 2h, obtain the transparent adhesive tape with certain degree of hardness
Block.
The blob of viscose being polymerized is carried out granulating, dry, pulverize into 60 mesh, obtains the thickening agent of white solid powder shape.
Embodiment 6
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl
Trimethyl ammonium chloride, five kinds of monomers of methacrylic acid are according to 45:12:3:6:7 weight, than adding in distilled water, is configured to monomer
Concentration is 25% solution.Under agitation add 0.15% potassium formate as chain-transferring agent, logical nitrogen 20min, then
(potassium peroxydisulfate and sodium sulfite, weight ratio is for 2 to add 0.005% redox initiator:1), stir, at 30 DEG C
Cause polymerization.When temperature is warming up to 85 ± 5 DEG C, record the time, be incubated 2h, obtain the transparent blob of viscose with certain degree of hardness.
The blob of viscose being polymerized is carried out granulating, dry, pulverize into 60 mesh, obtains the thickening agent of white solid powder shape.
Application examples
Fetch the seawater from Bohai Sea Gulf to mix in tune device in Wu Yin, open stirring, adjust rotating speed 600r/min～800r/min,
Weigh above-mentioned thickening agent by 0.5% weight ratio, be slowly added in seawater, stir about 5min；Then it is slowly added to thereto
0.3% organic zirconium crosslinker, until whirlpool disappears, during the slight projection of liquid level, stops stirring, that is, forms high temperature resistant seawater base pressure
Split liquid frozen glue.
The chemical index performance test results of the thickening agent of embodiment of the present invention preparation are shown in Table 1：
Table 1 seawater base thickening agent particular product performance parameters characterize
Fig. 2-Fig. 5 is respectively rheology at 150 DEG C for the seawater-based fracturing fluid prepared with the thickening agent that embodiment 1-4 obtains
Curve.Illustrate from table 1 and Fig. 2-5, the thickening agent molecular weight of present invention preparation 6,500,000～9,000,000, dissolves speed in the seawater
Rate is fast (≤5min), base fluid viscosity low (0.5% solution viscosity≤27mPa s), and cross-linked speed is fast (30s～80s), crosslinked
Frozen glue has higher viscoplasticity afterwards, has good heatproof, salt tolerant, resistant to shearing performance at 150 DEG C.At sea can directly use
Seawater joins liquid, convenient and swift, low cost, meets the technical need of marine pressure break reservoir reconstruction.
It should be noted last that, above specific embodiment only in order to technical scheme to be described and unrestricted,
Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should be covered
In the middle of scope of the presently claimed invention.
Claims (10)
1. a kind of pressure break seawater base thickening agent it is characterised in that described thickening agent be acrylamide, 2- acrylamide -2- first
Base propane sulfonic acid, NVP, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, being total to of five kinds of monomers of methacrylic acid
Polymers, its weight is than for 45～60:12～18:3～9:6～12:6～9.
2. pressure break as claimed in claim 1 with seawater base thickening agent it is characterised in that the relative molecular mass of described copolymer
Between 6,500,000～9,000,000.
3. a kind of pressure break with the preparation method of seawater base thickening agent it is characterised in that include：
By acrylamide, 2- acrylamide-2-methyl propane sulfonic, NVP, methylacryoyloxyethyl front three
Ammonium chloride, five kinds of monomers of methacrylic acid by weight 45～60:12～18:3～9:6～12:6～9 mixing, obtain mixing
Monomer, described mix monomer is mixed with a certain amount of distilled water, obtains mixed monomer solution, in described mixed monomer solution
The concentration of mix monomer is 25%～35%；
Add chain-transferring agent in described mixed monomer solution, and adjust solution ph in the range of 6.5～7.0, maintain reaction
Initial temperature is at 20 DEG C～30 DEG C；
To in the mixed monomer solution add chain-transferring agent, logical inert gas removes oxygen in water, is subsequently adding initiator, obtains
Obtain reaction system, continue to lead to inert gas in described reaction system, and keep described reaction system airtight, at 20 DEG C～30 DEG C
Trigger monomer is polymerized；
After trigger monomer polymerization, exothermic heat of reaction makes temperature of reaction system rise to 80 DEG C～90 DEG C, is incubated fully at this temperature
Reaction, obtains copolymer, and described copolymer obtains pressed powder after granulating, be dried, pulverizing, and described pressed powder is described
Thickening agent.
4. pressure break as claimed in claim 3 with the preparation method of seawater base thickening agent it is characterised in that described chain-transferring agent
Addition is the 0.15%～0.3% of described mixed monomer solution gross mass.
5. the pressure break as described in claim 3 or 4 with the preparation method of seawater base thickening agent it is characterised in that described chain tra nsfer
Agent is one of sodium formate, potassium formate, urea or two kinds.
6. the preparation method of pressure break seawater base thickening agent as claimed in claim 3 is it is characterised in that adding of described initiator
Dosage is the 0.005%～0.05% of described mixed monomer solution gross mass.
7. the pressure break as described in claim 3 or 6 with the preparation method of seawater base thickening agent it is characterised in that described initiator
For redox composite initiation system, in described redox composite initiation system oxidant be ammonium persulfate, in potassium peroxydisulfate
One kind, reducing agent be one of sodium sulfite, sodium hydrogensulfite；Wherein, the weight of described oxidant and described reducing agent
Than for 2:1.
8. pressure break as claimed in claim 3 with the preparation method of seawater base thickening agent it is characterised in that described reaction system protect
The warm reaction time is 2h.
9. the pressure break as described in claim 3-8 any claim with the preparation method of seawater base thickening agent it is characterised in that
The relative molecular mass of described copolymer is between 6,500,000～9,000,000.
10. application in seawater-based fracturing fluid for the thickening agent as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802025.2A CN106433600A (en) | 2016-09-05 | 2016-09-05 | Seawater-based thickening agent for fracturing as well as preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802025.2A CN106433600A (en) | 2016-09-05 | 2016-09-05 | Seawater-based thickening agent for fracturing as well as preparation method and application thereof |
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| CN110423602A (en) * | 2019-07-09 | 2019-11-08 | 华东理工大学 | A kind of superhigh temperature resistant polymer fracturing fluid system |
| CN111607032A (en) * | 2019-02-25 | 2020-09-01 | 中国石油天然气股份有限公司 | Thickening agent, preparation method and application thereof |
| CN111690396A (en) * | 2020-06-15 | 2020-09-22 | 山东滨州昱诚化工科技有限公司 | Preparation method of low-cost functional polymer type fracturing fluid |
| CN114790386A (en) * | 2021-01-25 | 2022-07-26 | 中国石油天然气股份有限公司 | High-temperature-resistant calcium chloride weighted polymer fracturing fluid base fluid, cross-linked gel and application thereof |
| CN115074106A (en) * | 2022-07-25 | 2022-09-20 | 山东诺尔生物科技有限公司 | Gel fracturing fluid and preparation method thereof |
| CN117004381A (en) * | 2023-06-30 | 2023-11-07 | 西安石油大学 | Salt-resistant and temperature-resistant oilfield fracturing fluid thickener |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111607032A (en) * | 2019-02-25 | 2020-09-01 | 中国石油天然气股份有限公司 | Thickening agent, preparation method and application thereof |
| CN111607032B (en) * | 2019-02-25 | 2022-08-05 | 中国石油天然气股份有限公司 | Thickening agent, preparation method and application thereof |
| CN110423602A (en) * | 2019-07-09 | 2019-11-08 | 华东理工大学 | A kind of superhigh temperature resistant polymer fracturing fluid system |
| CN111690396A (en) * | 2020-06-15 | 2020-09-22 | 山东滨州昱诚化工科技有限公司 | Preparation method of low-cost functional polymer type fracturing fluid |
| CN114790386A (en) * | 2021-01-25 | 2022-07-26 | 中国石油天然气股份有限公司 | High-temperature-resistant calcium chloride weighted polymer fracturing fluid base fluid, cross-linked gel and application thereof |
| CN115074106A (en) * | 2022-07-25 | 2022-09-20 | 山东诺尔生物科技有限公司 | Gel fracturing fluid and preparation method thereof |
| CN117004381A (en) * | 2023-06-30 | 2023-11-07 | 西安石油大学 | Salt-resistant and temperature-resistant oilfield fracturing fluid thickener |
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