CN116855239A - Composite slick water drag reducer and preparation method thereof - Google Patents
Composite slick water drag reducer and preparation method thereof Download PDFInfo
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- CN116855239A CN116855239A CN202310597361.8A CN202310597361A CN116855239A CN 116855239 A CN116855239 A CN 116855239A CN 202310597361 A CN202310597361 A CN 202310597361A CN 116855239 A CN116855239 A CN 116855239A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 65
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 69
- 229920013639 polyalphaolefin Polymers 0.000 claims abstract description 65
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 14
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 45
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- 239000000178 monomer Substances 0.000 claims description 14
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 claims description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 9
- 238000009210 therapy by ultrasound Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000376 reactant Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 150000008064 anhydrides Chemical class 0.000 claims description 6
- 229940069096 dodecene Drugs 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- MCULRUJILOGHCJ-UHFFFAOYSA-N triisobutylaluminium Chemical compound CC(C)C[Al](CC(C)C)CC(C)C MCULRUJILOGHCJ-UHFFFAOYSA-N 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005977 Ethylene Substances 0.000 claims description 5
- 229960000583 acetic acid Drugs 0.000 claims description 5
- 239000012362 glacial acetic acid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 3
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 3
- LWZFANDGMFTDAV-BURFUSLBSA-N [(2r)-2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O LWZFANDGMFTDAV-BURFUSLBSA-N 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000005457 ice water Substances 0.000 claims description 3
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 3
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 235000011067 sorbitan monolaureate Nutrition 0.000 claims description 3
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 12
- 239000012530 fluid Substances 0.000 description 11
- 230000009467 reduction Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000010008 shearing Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003541 multi-stage reaction Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
-
- 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
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
-
- 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
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
- C09K8/604—Polymeric surfactants
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- 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
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- 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
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Abstract
The invention discloses a composite slickwater drag reducer and a preparation method thereof, belonging to the technical field of drag reducers, wherein the composite slickwater drag reducer comprises the following raw materials in percentage by weight: the preparation method comprises the steps of putting the water-based system poly alpha olefin, the compatilizer, the modified montmorillonite and the polyethylene glycol into a reaction container E, uniformly mixing, and placing the reaction container E in the environment of 50-70 ℃ and stirring for 5-6h at the speed of 70-100r/min to prepare the composite slickwater drag reducer.
Description
Technical Field
The invention relates to the technical field of drag reducers, in particular to a composite slickwater drag reducer and a preparation method thereof.
Background
Slick water is a fracturing fluid system for hydraulically fracturing shale oil and gas reservoirs, and is one of key liquids for shale gas development. Compared with the traditional gel fracturing fluid system, the slick fracturing fluid system is widely applied to shale gas development by the characteristics of high efficiency and low cost. The type selection of the fracturing fluid often depends on the nature of an oil reservoir, and a water-based fracturing fluid system which is more commonly used in oil fields mainly comprises three types of water-based gel fracturing fluid, guanidine gum fracturing fluid and slick water fracturing fluid. Slick water fracturing fluid is widely applied to the development of unconventional oil and gas by the characteristic of low cost and low damage. Under the condition of large-displacement injection, drag reducer is needed to be added into slick water, so that large-displacement injection is realized, and the problems of low water viscosity, poor sand carrying capacity and the like are solved. The main active component of the common oil drag reducer is alpha-olefin long-chain polymer, and the molecules are extremely easy to break down and gradually lose drag reduction performance under the high-speed fluid shearing environment of a pipeline, and the continuous supplementation of the drag reducer for maintaining the drag reduction effect of pipeline transportation can lead to the improvement of transportation cost.
With development of microcomposites, a new thought is provided for design of drag reducer, and inorganic nano filler particles can improve various mechanical properties such as strength, rigidity, toughness and the like of a high polymer when reacting with the high polymer to prepare the composite material due to the effect of microcosmic size effect, so that the aim of improving the shearing resistance can be achieved by combining the inorganic nano filler particles with the drag reducer.
Therefore, the invention provides a composite slickwater drag reducer and a preparation method thereof, and the drag reducer with strong shearing resistance is realized by adding modified montmorillonite into traditional poly alpha olefin.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a composite slick water drag reducer and a preparation method thereof, which solve the problems.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the composite slick water drag reducer comprises the following raw materials in percentage by weight:
70-85 parts of water-based system poly alpha olefin, 15-30 parts of compatilizer, 0.1-1 part of modified montmorillonite and 85.1-116 parts of polyethylene glycol.
Preferably, the preparation method of the polyalphaolefin comprises the following steps:
(1) Adding reaction monomer into reaction vessel A, pre-cooling in ice-water mixture at 0deg.C for 10-15min, adding catalyst triisobutylaluminum, mixing for 5-10min, adding cyclohexane solvent with the same volume as the reaction monomer, and adding MgCl 2 Supported TiCl 4 A catalyst reacts for 24-25 hours;
(2) Adding absolute ethyl alcohol into reactants in a reaction container to terminate the reaction, and washing and filtering to obtain poly alpha olefin;
(3) Dividing the polyalphaolefin obtained into two components, wherein polyalphaolefin component one is used to formulate a water-based system polyalphaolefin, and wherein polyalphaolefin component two is used to formulate a compatibilizer;
(4) Adding the first poly-alpha-olefin component into a beaker, adding a compound surfactant, and stirring for 10-30min at 50-70 ℃ to obtain the water-based system poly-alpha-olefin.
Preferably, the reaction monomer in the step (1) is one or a mixture of two of ethylene, 1-decene and 1-dodecene in any ratio, wherein the mass percentage of the ethylene is 96% -99%, and the mass percentage of the 1-decene and 1-dodecene monomer or mixture is 1% -4%.
Preferably, the monomers reacted in step (1) are reacted with triisobutylaluminum in MgCl 2 Supported TiCl 4 The volume ratio of the catalyst is 1:0.05-0.1:1.
preferably, the compound surfactant in the step (4) is obtained by mixing Tween-20 and span-20 in a ratio of 3:1, and the ratio of the first polyalphaolefin component to the compound surfactant is 9:1.
Preferably, the preparation method of the compatilizer comprises the following steps:
s1: adding the second poly alpha olefin component into a reaction container B filled with absolute ethyl alcohol for complete dispersion, and putting the reaction container B into an ultrasonic cell grinder for ultrasonic treatment for 2-5h;
s2: adding maleic anhydride into the reaction vessel B after ultrasonic treatment, and continuously putting into an ultrasonic cell grinder for ultrasonic treatment for 20-30min to obtain poly alpha olefin grafted with the anhydride;
s3: adding the obtained poly-alpha-olefin grafted with anhydride into a reaction vessel C filled with toluene solution, heating and refluxing for 1-2h, pouring the solution into a reaction vessel D filled with acetone solution, filtering to obtain insoluble substances, washing the insoluble substances with the acetone solution, and drying to obtain a refined grafted product serving as a compatilizer.
Preferably, the mass ratio of the poly alpha olefin component II to the absolute ethyl alcohol, the maleic anhydride, the toluene solution and the acetone solution is 8-10:55-60:1-2:50-60:50-60.
Preferably, the preparation method of the modified montmorillonite comprises the following steps:
step one: adding 250ml of methanol and distilled water into a three-neck flask, adding 2-3g of silane coupling agent KH550, adding glacial acetic acid to adjust the PH to 5-6, controlling the reaction temperature to 55-60 ℃, and performing constant-temperature reaction for 1-2h;
step two: heating to 80-90 deg.c, adding 4-6g sodium montmorillonite, constant temperature reaction for 2-3 hr and cooling to room temperature;
step three: and washing the obtained reactant by methanol, centrifuging, precipitating for at least three times, and then drying to obtain the silane coupling agent modified montmorillonite.
Preferably, in the first step, the volume ratio of methanol to distilled water is 9:1.
a preparation method of a composite slick water drag reducer comprises the following steps:
the water-based system poly alpha olefin, the compatilizer, the modified montmorillonite and the polyethylene glycol are put into a reaction vessel E to be uniformly mixed, and the reaction vessel E is placed in an environment of 50-70 ℃ and stirred for 5-6 hours at a speed of 70-100r/min, so that the composite slickwater drag reducer is prepared.
Advantageous effects
The invention provides a composite slick water drag reducer and a preparation method thereof. Compared with the prior art, the method has the following beneficial effects:
according to the invention, the silane coupling agent KH550 is adopted to carry out modification treatment on sodium montmorillonite, so that a part of functional groups are added on the surface of the modified montmorillonite, the lipophilic property of the modified montmorillonite is improved, and the binding capacity with a high molecular organic polymer is enhanced, so that the composite slick water drag reducer produced by carrying out a composite reaction with the water-based system polyalphaolefin is improved in strength, rigidity and toughness, and meanwhile, the composite slick water drag reducer prepared by the invention can be easily dissolved in water through the configured composite surfactant, so that slick water is configured, and the shear stress generated by turbulence, vortex and the like in a pipeline can be effectively counteracted by the composite slick water drag reducer prepared by the invention, so that the use cost of the drag reducer is reduced.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
the preparation method of the modified montmorillonite comprises the following steps:
step one: 250ml of methanol and distilled water are added into a three-neck flask, 2g of silane coupling agent KH550 is added, glacial acetic acid PH is added to be adjusted to 5, the reaction temperature is controlled to be 56 ℃, and the constant temperature reaction is carried out for 1.5 hours;
step two: raising the temperature to 85 ℃, adding 4g of sodium montmorillonite, reacting for 2 hours at constant temperature, and cooling to room temperature;
step three: and washing the obtained reactant by methanol, centrifuging, precipitating for at least three times, and then drying to obtain the silane coupling agent modified montmorillonite.
In the first step, the volume ratio of the methanol to the distilled water is 9:1.
embodiment two:
the preparation method of the modified montmorillonite comprises the following steps:
step one: 250ml of methanol and distilled water are added into a three-neck flask, 2.5g of silane coupling agent KH550 is added, the PH of glacial acetic acid is added to be regulated to 6, the reaction temperature is controlled to be 56 ℃, and the constant temperature reaction is carried out for 1.5h;
step two: raising the temperature to 85 ℃, adding 5g of sodium montmorillonite, reacting for 2 hours at constant temperature, and cooling to room temperature;
step three: and washing the obtained reactant by methanol, centrifuging, precipitating for at least three times, and then drying to obtain the silane coupling agent modified montmorillonite.
In the first step, the volume ratio of the methanol to the distilled water is 9:1.
embodiment III:
the preparation method of the modified montmorillonite comprises the following steps:
step one: 250ml of methanol and distilled water are added into a three-neck flask, 3g of silane coupling agent KH550 is added, glacial acetic acid PH is added to be regulated to 5.5, the reaction temperature is controlled to be 56 ℃, and the constant temperature reaction is carried out for 1.5 hours;
step two: raising the temperature to 85 ℃, adding 6g of sodium montmorillonite, reacting for 2 hours at constant temperature, and cooling to room temperature;
step three: and washing the obtained reactant by methanol, centrifuging, precipitating for at least three times, and then drying to obtain the silane coupling agent modified montmorillonite.
In the first step, the volume ratio of the methanol to the distilled water is 9:1.
embodiment four:
the preparation method of the water-based system poly alpha olefin comprises the following steps:
(1) Adding reaction monomer into reaction vessel A, pre-cooling in ice-water mixture at 0deg.C for 10min, adding triisobutylaluminum catalyst, mixing for 5min, adding cyclohexane solvent with the same volume as the reaction monomer, and adding MgCl 2 Supported TiCl 4 A catalyst, and reacting for 24 hours;
(2) And adding absolute ethyl alcohol into reactants in the reaction container to terminate the reaction, and washing and filtering to obtain the poly alpha olefin.
(3) Dividing the polyalphaolefin obtained into two components, wherein polyalphaolefin component one is used to formulate a water-based system polyalphaolefin, and wherein polyalphaolefin component two is used to formulate a compatibilizer;
(4) Adding the first poly-alpha-olefin component into a beaker, adding a compound surfactant, and stirring for 10-30min at 50-70 ℃ to obtain the water-based system poly-alpha-olefin.
The reaction monomers in the step (1) are 1-decene and 1-dodecene, wherein 96 parts of ethylene and 4 parts of 1-dodecene are used. Reacting the monomer with triisobutylaluminum in step (1) with MgCl 2 Supported TiCl 4 The volume ratio of the catalyst is 1:0.05:1. the compound surfactant in the step (4) is obtained by mixing Tween-20 and span-20 in a ratio of 3:1, and the ratio of the first polyalphaolefin component to the compound surfactant is 9:1.
The preparation method of the compatilizer comprises the following steps:
s1: adding the second poly alpha olefin component into a reaction container B filled with absolute ethyl alcohol for complete dispersion, and putting the reaction container B into an ultrasonic cell grinder for ultrasonic treatment for 3 hours;
s2: adding maleic anhydride into the reaction vessel B after ultrasonic treatment, and continuously putting into an ultrasonic cell grinder for ultrasonic treatment for 30min to obtain poly alpha olefin grafted with the anhydride;
s3: adding the obtained poly-alpha-olefin grafted with anhydride into a reaction container C filled with toluene solution, heating and refluxing for 2h, pouring the solution into a reaction container D filled with acetone solution, filtering to obtain insoluble substances, washing the insoluble substances with the acetone solution, and drying to obtain a refined grafted product serving as a compatilizer.
Fifth embodiment:
a preparation method of a composite slick water drag reducer comprises the following steps:
the water-based system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol are mixed according to 70 parts by weight: 29.9:0.1:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the first embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Example six:
a preparation method of a composite slick water drag reducer comprises the following steps:
the water-based system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol are mixed according to the proportion of 70:29.9:0.1:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the second embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Embodiment seven:
a preparation method of a composite slick water drag reducer comprises the following steps:
the water-based system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol are mixed according to the proportion of 70:29.9:0.1:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the third embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Example eight:
a preparation method of a composite slick water drag reducer comprises the following steps:
mixing water-base system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol with 75:24.5:0.5:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the first embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Example nine:
a preparation method of a composite slick water drag reducer comprises the following steps:
mixing water-base system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol with 75:24.5:0.5:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the second embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Example ten:
a preparation method of a composite slick water drag reducer comprises the following steps:
mixing water-base system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol with 75:24.5:0.5:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the third embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Example eleven:
a preparation method of a composite slick water drag reducer comprises the following steps:
mixing water-base system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol with 80:19:1:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the first embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Embodiment twelve:
a preparation method of a composite slick water drag reducer comprises the following steps:
mixing water-base system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol with 80:19:1:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the second embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Embodiment thirteen:
a preparation method of a composite slick water drag reducer comprises the following steps:
mixing water-base system poly alpha olefin, compatilizer, modified montmorillonite and polyethylene glycol with 80:19:1:100 are put into a reaction vessel E for uniform mixing, and the reaction vessel E is placed under the environment of 60 ℃ and stirred for 5 hours at the speed of 70-100r/min, so that the composite slickwater drag reducer is prepared. Wherein the modified montmorillonite is prepared in the third embodiment, and the water-based system poly alpha olefin and the compatilizer are prepared in the fourth embodiment.
Comparative example:
directly taking the water-based system poly alpha olefin as the slickwater drag reducer.
The parameters for representing the drag reduction performance are generally the transmission increasing rate and the drag reduction rate, the drag reduction performance of the composite slickwater drag reducer is characterized by mainly using the drag reduction rate, and the industrial standard NB/T14003.2-2016 shale gas fracturing fluid part 2: the drag reducer performance index and test method test the drag reducer for composite slickwater prepared in the fifth to thirteenth embodiments and the drag reducer for slickwater of the comparative example, and the test was performed by the existing drag reducer loop test device. The test results are shown in Table 1 below:
table 1:
the anti-shearing test is carried out on the composite slickwater drag reducer, a 1kW,3000rp centrifugal pump is arranged in the middle section of a drag reducer loop test device, the resistance reduction rate of a measured solution passing through the centrifugal pump is measured, and the test result is shown in the following table 2:
TABLE 2
| Examples | Resistivity reduction |
| Example five | 68.1％ |
| Example six | 69.4％ |
| Example seven | 70.2％ |
| Example eight | 68.5％ |
| Example nine | 69.7％ |
| Examples ten | 70.4％ |
| Example eleven | 69.9％ |
| Example twelve | 70.7％ |
| Example thirteen | 72.1％ |
| Comparative example | 20.3％ |
The comparison of the table 1 and the table 2 shows that the compound slickwater drag reducer prepared by the invention has stronger drag reducing effect, and simultaneously, the shearing resistance of the compound slickwater drag reducer is greatly improved compared with that of the traditional poly alpha olefin drag reducer.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A composite slick water drag reducer, characterized in that: the composite slickwater drag reducer comprises the following raw materials in percentage by weight:
70-85 parts of water-based system poly alpha olefin, 15-30 parts of compatilizer, 0.1-1 part of modified montmorillonite and 85.1-116 parts of polyethylene glycol.
2. The composite slick water drag reducer of claim 1, wherein: the preparation method of the water-based system poly alpha olefin comprises the following steps:
(1) Adding reaction monomer into reaction vessel A, pre-cooling in ice-water mixture at 0deg.C for 10-15min, adding catalyst triisobutylaluminum, mixing for 5-10min, adding cyclohexane solvent with the same volume as the reaction monomer, and adding MgCl 2 Supported TiCl 4 A catalyst reacts for 24-25 hours;
(2) Adding absolute ethyl alcohol into the reactant in the reaction vessel A to terminate the reaction, and obtaining poly alpha olefin through washing and filtering;
(3) Dividing the polyalphaolefin obtained into two components, wherein polyalphaolefin component one is used to formulate a water-based system polyalphaolefin, and wherein polyalphaolefin component two is used to formulate a compatibilizer;
(4) Adding the first poly-alpha-olefin component into a beaker, adding a compound surfactant, and stirring for 10-30min at 50-70 ℃ to obtain the water-based system poly-alpha-olefin.
3. The composite slick water drag reducer of claim 2, wherein: the reaction monomer in the step (1) is one or a mixture of two of ethylene, 1-decene and 1-dodecene in any ratio, wherein the mass percentage of the ethylene is 96-99%, and the mass percentage of the 1-decene and 1-dodecene monomer or mixture is 1-4%.
4. The composite slick water drag reducer of claim 2, wherein: step by stepReacting the monomer with triisobutylaluminum in step (1) with MgCl 2 Supported TiCl 4 The volume ratio of the catalyst is 1:0.05-0.1:1.
5. the composite slick water drag reducer of claim 2, wherein: the compound surfactant in the step (4) is obtained by mixing Tween-20 and span-20 in a ratio of 3:1, and the ratio of the first polyalphaolefin component to the compound surfactant is 9:1.
6. The composite slick water drag reducer of claim 2, wherein: the preparation method of the compatilizer comprises the following steps:
s1: adding the second poly alpha olefin component into a reaction container B filled with absolute ethyl alcohol for complete dispersion, and putting the reaction container B into an ultrasonic cell grinder for ultrasonic treatment for 2-5h;
s2: adding maleic anhydride into the reaction vessel B after ultrasonic treatment, and continuously putting into an ultrasonic cell grinder for ultrasonic treatment for 20-30min to obtain poly alpha olefin grafted with the anhydride;
s3: adding the obtained poly-alpha-olefin grafted with anhydride into a reaction vessel C filled with toluene solution, heating and refluxing for 1-2h, pouring the solution into a reaction vessel D filled with acetone solution, filtering to obtain insoluble substances, washing the insoluble substances with the acetone solution, and drying to obtain a refined grafted product serving as a compatilizer.
7. The composite slick water drag reducer of claim 6, wherein: the mass ratio of the poly alpha olefin component II to absolute ethyl alcohol, maleic anhydride, toluene solution and acetone solution is 8-10:55-60:1-2:50-60:50-60.
8. The composite slick water drag reducer of claim 1, wherein: the preparation method of the modified montmorillonite comprises the following steps:
step one: adding 250ml of methanol and distilled water into a three-neck flask, adding 2-3g of silane coupling agent KH550, adding glacial acetic acid to adjust the PH to 5-6, controlling the reaction temperature to 55-60 ℃, and performing constant-temperature reaction for 1-2h;
step two: heating to 80-90 deg.c, adding 4-6g sodium montmorillonite, constant temperature reaction for 2-3 hr and cooling to room temperature;
step three: and washing the obtained reactant by methanol, centrifuging, precipitating for at least three times, and then drying to obtain the silane coupling agent modified montmorillonite.
9. The composite slick water drag reducer of claim 8, wherein: in the first step, the volume ratio of the methanol to the distilled water is 9:1.
10. the method of preparing a composite slickwater drag reducer as claimed in any of claims 1-9, comprising the steps of:
the water-based system poly alpha olefin, the compatilizer, the modified montmorillonite and the polyethylene glycol are put into a reaction vessel E to be uniformly mixed, and the reaction vessel E is placed in an environment of 50-70 ℃ and stirred for 5-6 hours at a speed of 70-100r/min, so that the composite slickwater drag reducer is prepared.
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