CN116536785A - Fiber for fracturing and preparation method thereof - Google Patents
Fiber for fracturing and preparation method thereof Download PDFInfo
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- CN116536785A CN116536785A CN202310666573.7A CN202310666573A CN116536785A CN 116536785 A CN116536785 A CN 116536785A CN 202310666573 A CN202310666573 A CN 202310666573A CN 116536785 A CN116536785 A CN 116536785A
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- 239000000835 fiber Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 46
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 28
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 26
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 229920000642 polymer Polymers 0.000 claims abstract description 23
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 21
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 claims abstract description 14
- LGPAKRMZNPYPMG-UHFFFAOYSA-N (3-hydroxy-2-prop-2-enoyloxypropyl) prop-2-enoate Chemical compound C=CC(=O)OC(CO)COC(=O)C=C LGPAKRMZNPYPMG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000839 emulsion Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000010008 shearing Methods 0.000 claims abstract description 10
- 238000005491 wire drawing Methods 0.000 claims abstract description 10
- CMDGQTVYVAKDNA-UHFFFAOYSA-N propane-1,2,3-triol;hydrate Chemical compound O.OCC(O)CO CMDGQTVYVAKDNA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000009775 high-speed stirring Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 abstract description 13
- 230000015556 catabolic process Effects 0.000 abstract description 8
- 238000006731 degradation reaction Methods 0.000 abstract description 8
- 238000003786 synthesis reaction Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 49
- 239000012530 fluid Substances 0.000 description 17
- 238000010276 construction Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/36—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising unsaturated carboxylic acids or unsaturated organic esters as the major constituent
-
- 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
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Polymers & Plastics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a fiber for fracturing and a preparation method thereof. The preparation method comprises the following steps: butyl acrylate, acrylic acid, allyl alcohol polyoxyethylene polyoxypropylene ether, bisphenol A glycerol diacrylate and water are sequentially added into a reactor, stirred at a high speed, mixed into uniform emulsion, and the pH value is regulated to 6-7 by sodium hydroxide solution; adding ammonium persulfate solution into the overhead tank 1, and adding sodium sulfite solution into the overhead tank 2; simultaneously dropwise adding the mixture into a reactor, stirring for reaction, heating, and continuing stirring for reaction to obtain a viscous polymer; and (3) carrying out jet flow, winding, wire drawing, winding again and shearing on the polymer to obtain the fiber, thus obtaining the product. The fracturing fiber has the characteristics of wide raw material sources, simple synthesis process, 100 percent of yield, adjustable automatic degradation temperature, strong sand carrying capacity and low reduction rate of the diversion capacity.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a fiber for fracturing and a preparation method thereof.
Background
At present, sand-carrying fracturing is an important technical means for reforming a reservoir of an oil and gas well, and plays an important role in improving the recovery ratio of crude oil, improving water injection conditions and the like. The purpose of the fracturing construction is to achieve the maximum fracture conductivity within the limit of the design construction. The proper flowback process in the fracturing construction can ensure that the propping agent in the fracture can quickly flow back out of the stratum while the flowback amount is reduced.
For a conventional fracturing fluid system, due to limited sand carrying performance, the sedimentation and sand removal of the supporting ceramsite in the sand carrying process of the fracturing fluid often influence the flow conductivity of the supporting crack, and further influence the fracturing transformation effect. And adding degradable fibers into the fracturing fluid system as temporary plugging agents to be injected into the cracks of the reservoir along with the fracturing fluid, effectively plugging the main cracks, generating certain temporary plugging pressure along with the pumping of the subsequent fracturing fluid, and inducing the cracks to turn to form branch cracks, so that a new crack network is formed in the reservoir, and the seepage area of the reservoir is increased. After the construction measures, the fiber is gradually degraded at the stratum temperature, and is discharged out of the reservoir along with the fracturing flowback fluid, so that the fracture conductivity after fracturing is not affected.
CN108841370B discloses a high-strength fiber fracturing fluid, a preparation method and application thereof, wherein the high-strength fiber fracturing fluid comprises the following components in parts by weight: 100 parts of water, 0.1-0.25 part of polymer thickener, 0.01 part of gel breaker and 0.3-1.2 parts of degradable fiber. The fiber used in the invention has good dispersibility, can be completely degraded under the condition of medium and low temperature reservoir temperature, is insoluble below the reservoir temperature, does not influence construction, improves sand suspension property of the fracturing fluid, and has good compatibility with other auxiliary agents; has good static/dynamic sand carrying performance and rheological property, the degradation rate is only 0.15-1.51% at 50 ℃ in 24 hours, and the degradation rate reaches 99.05% at 60 ℃ in 24 hours. Not only meets the requirement of construction strength, but also degrades rapidly after construction. The degradation rate of the invention is 0.15-1.51% in 24 hours under the condition of 50 ℃; the degradation rate reaches 99.05% at 60 ℃ in 24 hours, the temperature is increased by 10 ℃, and the product solubility is basically insoluble to basically fully soluble, so that the temperature range suitable for a construction well is narrower, and the application range is limited.
Disclosure of Invention
The invention aims at the defects of the prior art and provides a fiber for fracturing and a preparation method thereof. The fiber for fracturing has the characteristics of wide raw material sources, simple synthesis process, 100% yield, adjustable automatic degradation temperature, strong sand carrying capacity and low reduction rate of diversion capacity.
Accordingly, in order to achieve the above object, in one aspect, the present invention discloses a method for preparing a fiber for fracturing, which comprises the following specific steps:
(1) Butyl acrylate, acrylic acid, allyl alcohol polyoxyethylene polyoxypropylene ether, bisphenol A glycerol diacrylate and water are sequentially added into a reactor, stirred at a high speed, mixed into a uniform emulsion, and the pH value is regulated to 6-7 by 5wt% of sodium hydroxide solution;
(2) Adding ammonium persulfate solution into the overhead tank 1, and adding sodium sulfite solution into the overhead tank 2; simultaneously dropwise adding sodium sulfite solution into the reactor after 5-10min, stirring for reacting for 0.5-1h, heating to 60-65 ℃, and continuing stirring for reacting for 1-2h to obtain a viscous polymer;
(3) And (3) carrying out jet flow, winding, wire drawing, winding again and shearing on the polymer to obtain the fiber, thus obtaining the product fiber for fracturing.
On the other hand, the invention discloses the fiber for fracturing prepared by the preparation method, and the molecular structural formula of the fiber for fracturing is as follows:
wherein:
a＝5000-100000；
b＝1000-20000；
c＝50-1000；
d＝200-4000；
e＝5000-100000；
f＝1000-20000；
g＝50-1000；
h＝200-4000；
m＝4-10；
n＝6-20。
the fracturing fiber of the present invention is a high molecular polymer. The main monomer is butyl acrylate, which is characterized in that: the density is low, sand carrying in the fracturing fluid is facilitated, the fracturing fluid is not hydrophilic, the product can stably suspend in the low-temperature fracturing fluid, the fracturing fluid is decomposed at high temperature, and the fracturing fluid is automatically degraded into acrylic acid and butanol; on the one hand, the effect of the acrylic acid enhances the emulsification degree of butyl acrylate in the synthesis process, is favorable for the stable progress of polymerization reaction, and on the other hand, carboxyl in molecules is a hydrophilic group, so that the infiltration of a product and water phase fracturing fluid can be enhanced, and the diversion capacity is reduced as little as possible; the allyl alcohol polyoxyethylene polyoxypropylene ether belongs to a surfactant, and the synthetic process enhances the emulsification degree of all monomers, is favorable for stably carrying out polymerization reaction, is favorable for reducing the friction resistance of products and fracturing fluid, reduces the diversion capacity as little as possible, and can strengthen the infiltration of finished products and water phase fracturing fluid by polyoxyethylene ether groups in molecules and reduce the diversion capacity as little as possible; bisphenol A glycerol diacrylate makes product molecule polymerization into network structure, has strengthened the intensity of molecule, and benzene ring structure in the molecule also can strengthen the intensity of molecule, can improve sand carrying ability, and self molecule high temperature is unstable, is favorable to automatic degradation after the fracturing is accomplished. The product can adjust degradation time, sand carrying capacity and diversion capacity by adjusting the proportion of different monomers.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The raw materials of the fracturing fiber are widely available, all are popular industrial products, and the synthesis process is simple;
(2) The fiber synthesis one-pot method for fracturing has the yield of 100 percent, and all products can be used as products;
(3) The fiber for fracturing can be automatically degraded, and the dissolution temperature is controlled according to different monomer proportions;
(4) The fiber for fracturing has higher sand carrying capacity, and the static sedimentation rate of the ceramsite reaches more than 25 percent, which is far more than the requirement of more than 10 percent in the standard; the air-conditioning device has better air-guiding capability, and the air-guiding capability reduction rate is less than 3.5 percent and is far lower than the requirement of less than 10 percent in the standard.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
According to a first aspect of the invention, the invention discloses a preparation method of a fiber for fracturing, which comprises the following specific steps:
(1) Butyl acrylate, acrylic acid, allyl alcohol polyoxyethylene polyoxypropylene ether, bisphenol A glycerol diacrylate and water are sequentially added into a reactor, stirred at a high speed, mixed into a uniform emulsion, and the pH value is regulated to 6-7 by 5wt% of sodium hydroxide solution;
(2) Adding ammonium persulfate solution into the overhead tank 1, and adding sodium sulfite solution into the overhead tank 2; simultaneously dropwise adding sodium sulfite solution into the reactor after 5-10min, stirring for reacting for 0.5-1h, heating to 60-65 ℃, and continuing stirring for reacting for 1-2h to obtain a viscous polymer;
(3) And (3) carrying out jet flow, winding, wire drawing, winding again and shearing on the polymer to obtain the fiber, thus obtaining the product fiber for fracturing.
In the invention, preferably, the weight ratio of the butyl acrylate, the acrylic acid, the allyl alcohol polyoxyethylene polyoxypropylene ether and the bisphenol A glycerol diacrylate is 1:0.1-0.2:0.05-0.1:0.2-0.3.
Preferably, in step (1), the weight of the water is 4 to 5 times the mass of butyl acrylate.
Preferably, in the step (1), the speed of the high-speed stirring is 800-1200rpm; more preferably, the high speed stirring speed is 900-1000rpm.
In the invention, preferably, in the step (2), the mass concentration of the ammonium persulfate solution and the sodium sulfite solution is 5-7wt% and 1-3wt% respectively.
Preferably, in the step (2), the weight ratio of the ammonium persulfate solution, the sodium sulfite solution and the butyl acrylate is 0.2-0.4:0.2-0.4:1.
preferably, in the step (2), the simultaneous dropwise addition to the reactor takes place for 30 to 40 minutes.
In the present invention, preferably, in the step (3), the length of the fiber is 3 to 5mm.
In the present invention, the treatment of the polymer such as jet, winding, drawing, etc. is a conventional technique in the art. Their specific process may be routinely adjusted by those skilled in the art.
The fiber synthesis reaction equation for fracturing of the present invention is as follows:
in a second aspect, the invention provides a fiber for fracturing prepared by the preparation method, wherein the molecular structural formula of the fiber for fracturing is as follows:
wherein:
a＝5000-100000；
b＝1000-20000；
c＝50-1000；
d＝200-4000；
e＝5000-100000；
f＝1000-20000；
g＝50-1000；
h＝200-4000；
m＝4-10；
n＝6-20。
the molecular weight of the fracturing fiber is 2000000-20000000.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
The invention will be further illustrated with reference to specific examples.
In the present invention, the devices or apparatus used are all conventional devices or apparatus known in the art, and are commercially available.
In the following examples and comparative examples, each reagent used was a chemically pure reagent from commercial sources, unless otherwise specified.
Example 1:
(1) 1kg of butyl acrylate, 0.1kg of acrylic acid, 0.05kg of allyl alcohol polyoxyethylene polyoxypropylene ether, 0.3kg of bisphenol A glycerol diacrylate and 5kg of water are sequentially added into a reactor; stirring at high speed of 800rpm, mixing all materials into uniform emulsion, and regulating pH to 6-7 with 5wt% sodium hydroxide solution;
(2) Adding 0.2kg of 6wt% ammonium persulfate solution into the overhead tank 1, adding 0.2kg of 2wt% sodium sulfite solution into the overhead tank 2, dropwise adding the ammonium persulfate solution into the reactor at the same time, after the completion of 30min of dropwise adding the ammonium persulfate solution, the completion of dropwise adding the sodium sulfite solution after 10min, continuously stirring for reacting for 0.5h, heating to 60 ℃, and continuously stirring for reacting for 1h to obtain a viscous polymer;
(3) The polymer is subjected to jet flow, winding, wire drawing, winding again and shearing to prepare the fiber with the length of 3-5mm, namely the fiber Q for fracturing the product 1 。
Example 2:
(1) 1kg of butyl acrylate, 0.12kg of acrylic acid, 0.06kg of allyl alcohol polyoxyethylene polyoxypropylene ether, 0.28kg of bisphenol A glycerol diacrylate and 4.8kg of water are sequentially added into a reactor; stirring at high speed of 900rpm, mixing all materials into uniform emulsion, and regulating pH to 6-7 with 5wt% sodium hydroxide solution;
(2) Adding 0.25kg of 7wt% ammonium persulfate solution into the overhead tank 1, adding 0.25kg of 1.5wt% sodium sulfite solution into the overhead tank 2, dropwise adding the ammonium persulfate solution into the reactor at the same time, after the completion of dropwise adding the ammonium persulfate solution for 40min, dropwise adding the sodium sulfite solution for 5min, continuously stirring for reacting for 0.6h, heating to 62 ℃, and continuously stirring for reacting for 1.5h to obtain a viscous polymer;
(3) The polymer is subjected to jet flow, winding, wire drawing, winding again and shearing to prepare the fiber with the length of 3-5mm, namely the fiber Q for fracturing the product 2 。
Example 3:
(1) 1kg of butyl acrylate, 0.14kg of acrylic acid, 0.07kg of allyl alcohol polyoxyethylene polyoxypropylene ether, 0.26kg of bisphenol A glycerol diacrylate and 4.6kg of water are sequentially added into a reactor; stirring at high speed of 1000rpm, mixing all materials into uniform emulsion, and regulating pH to 6-7 with 5wt% sodium hydroxide solution;
(2) Adding 0.3kg of 5wt% ammonium persulfate solution into the overhead tank 1, adding 0.3kg of 2.5wt% sodium sulfite solution into the overhead tank 2, dropwise adding the ammonium persulfate solution into the reactor at the same time, after 35min of dropwise adding the ammonium persulfate solution, dropwise adding the sodium sulfite solution after 8min of dropwise adding, continuously stirring for reacting for 0.8h, heating to 61 ℃, and continuously stirring for reacting for 2h to obtain a viscous polymer;
(3) The polymer is subjected to jet flow, winding, wire drawing, winding again and shearing to prepare the fiber with the length of 3-5mm, namely the fiber Q for fracturing the product 3 。
Example 4:
(1) 1kg of butyl acrylate, 0.16kg of acrylic acid, 0.08kg of allyl alcohol polyoxyethylene polyoxypropylene ether, 0.25kg of bisphenol A glycerol diacrylate and 4.4kg of water are sequentially added into a reactor; stirring at high speed of 1200rpm, mixing all materials into uniform emulsion, and regulating pH to 6-7 with 5wt% sodium hydroxide solution;
(2) Adding 0.35kg of 6wt% ammonium persulfate solution into the overhead tank 1, adding 0.35kg of 2wt% sodium sulfite solution into the overhead tank 2, dropwise adding the ammonium persulfate solution into the reactor at the same time, after 33min of dropwise adding the ammonium persulfate solution is finished, dropwise adding the sodium sulfite solution for 6min, continuously stirring for reacting for 1h, heating to 63 ℃, and continuously stirring for reacting for 1.2h to obtain a viscous polymer;
(3) The polymer is subjected to jet flow, winding, wire drawing, winding again and shearing to prepare the fiber with the length of 3-5mm, namely the fiber Q for fracturing the product 4 。
Example 5:
(1) 1kg of butyl acrylate, 0.18kg of acrylic acid, 0.09kg of allyl alcohol polyoxyethylene polyoxypropylene ether, 0.22kg of bisphenol A glycerol diacrylate and 4.2kg of water are sequentially added into a reactor; stirring at 1100rpm at high speed, mixing all materials into uniform emulsion, and regulating pH to 6-7 with 5wt% sodium hydroxide solution;
(2) Adding 0.4kg of a 6.5wt% ammonium persulfate solution into the overhead tank 1, adding 0.4kg of a 1wt% sodium sulfite solution into the overhead tank 2, dropwise adding the ammonium persulfate solution into the reactor at the same time, after the completion of 32min of dropwise adding the ammonium persulfate solution, the completion of dropwise adding the sodium sulfite solution after 7min, continuously stirring for reacting for 0.6h, heating to 65 ℃, and continuously stirring for reacting for 1.8h to obtain a viscous polymer;
(3) The polymer is subjected to jet flow, winding, wire drawing, winding again and shearing to prepare the fiber with the length of 3-5mm, namely the fiber Q for fracturing the product 5 。
Example 6:
(1) 1kg of butyl acrylate, 0.2kg of acrylic acid, 0.1kg of allyl alcohol polyoxyethylene polyoxypropylene ether, 0.2kg of bisphenol A glycerol diacrylate and 4kg of water are sequentially added into a reactor; stirring at high speed of 1000rpm, mixing all materials into uniform emulsion, and regulating pH to 6-7 with 5wt% sodium hydroxide solution;
(2) Adding 0.3kg of 5.5wt% ammonium persulfate solution into the overhead tank 1, adding 0.3kg of 3wt% sodium sulfite solution into the overhead tank 2, dropwise adding the ammonium persulfate solution into the reactor at the same time, after 36min of dropwise adding the ammonium persulfate solution is completed, dropwise adding the sodium sulfite solution after 8min of dropwise adding, continuously stirring for reacting for 0.9h, heating to 62 ℃, and continuously stirring for reacting for 1.6h to obtain a viscous polymer;
(3) The polymer is subjected to jet flow, winding, wire drawing, winding again and shearing to prepare the fiber with the length of 3-5mm, namely the fiber Q for fracturing the product 6 。
Example 7 evaluation of high temperature solubility
The above products were placed in tap water at different temperatures and allowed to stand for 24 hours, and then the dissolution was visually observed, and the results are shown in Table 1.
Table 1 results of solubility test
As can be seen from table 1: the dissolution temperature can be controlled according to different monomer proportions when the product is used for meeting construction requirements, and the higher the proportion of acrylic acid and allyl alcohol polyoxyethylene polyoxypropylene ether monomers is, the more soluble the product is in water.
Example 8 evaluation of improved sand carrying Capacity
The static sedimentation rate reduction rate of the ceramsite is tested by referring to Q/SH 10202676-2018 technical requirement of fiber for fracturing, and the result is shown in Table 2.
Example 9 flow conductivity evaluation
The reduction rate of the conductivity was tested with reference to Q/SH 10202676-2018, technical requirement for fiber for fracturing, and the results are shown in Table 2.
TABLE 2 test results of sand carrying Capacity and conductivity
As can be seen from table 3: the reduction rate of the static sedimentation rate of the ceramsite is more than 27 percent and far exceeds the requirement of more than 10 percent in the standard; the flow conductivity reduction rate is lower than 3.2%, which is far lower than the requirement of less than 10% in the standard.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (9)
1. The preparation method of the fiber for fracturing is characterized by comprising the following steps:
(1) Butyl acrylate, acrylic acid, allyl alcohol polyoxyethylene polyoxypropylene ether, bisphenol A glycerol diacrylate and water are sequentially added into a reactor, stirred at a high speed, mixed into a uniform emulsion, and the pH value is regulated to 6-7 by 5wt% of sodium hydroxide solution;
(2) Adding ammonium persulfate solution into the overhead tank 1, and adding sodium sulfite solution into the overhead tank 2; simultaneously dropwise adding sodium sulfite solution into the reactor after 5-10min, stirring for reacting for 0.5-1h, heating to 60-65 ℃, and continuing stirring for reacting for 1-2h to obtain a viscous polymer;
(3) And (3) carrying out jet flow, winding, wire drawing, winding again and shearing on the polymer to obtain the fiber, thus obtaining the product fiber for fracturing.
2. The preparation method of claim 1, wherein the weight ratio of butyl acrylate, acrylic acid, allyl alcohol polyoxyethylene polyoxypropylene ether and bisphenol A glycerol diacrylate is 1:0.1-0.2:0.05-0.1:0.2-0.3.
3. The process according to claim 1, wherein in the step (1), the weight of the water is 4 to 5 times the mass of butyl acrylate.
4. The method according to claim 1, wherein in the step (1), the high-speed stirring is performed at a speed of 800 to 1200rpm.
5. The preparation method according to claim 1, wherein in the step (2), the mass concentration of the ammonium persulfate solution and the sodium sulfite solution is 5-7wt% and 1-3wt%, respectively.
6. The method according to claim 1, wherein in the step (2), the weight ratio of the ammonium persulfate solution, the sodium sulfite solution and the butyl acrylate is 0.2 to 0.4:0.2-0.4:1.
7. the process according to claim 1, wherein in step (2), the simultaneous dropwise addition to the reactor takes place for 30 to 40 minutes.
8. The fiber for fracturing prepared by the preparation method according to any one of claims 1 to 7, wherein the molecular structural formula of the fiber for fracturing is as follows:
wherein:
a＝5000-100000；
b＝1000-20000；
c＝50-1000；
d＝200-4000；
e＝5000-100000；
f＝1000-20000；
g＝50-1000；
h＝200-4000；
m＝4-10；
n＝6-20。
9. the frac fiber of claim 8, wherein the frac fiber has a molecular weight of 2000000-20000000.
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