CN114507319A - Preparation method of filtrate reducer and filtrate reducer - Google Patents
Preparation method of filtrate reducer and filtrate reducer Download PDFInfo
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- CN114507319A CN114507319A CN202011287392.6A CN202011287392A CN114507319A CN 114507319 A CN114507319 A CN 114507319A CN 202011287392 A CN202011287392 A CN 202011287392A CN 114507319 A CN114507319 A CN 114507319A
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- fluid loss
- monomer
- loss additive
- anionic monomer
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- 238000002360 preparation method Methods 0.000 title claims abstract description 40
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 33
- 239000000706 filtrate Substances 0.000 title claims abstract description 28
- 239000000178 monomer Substances 0.000 claims abstract description 125
- 125000000129 anionic group Chemical group 0.000 claims abstract description 66
- 239000000654 additive Substances 0.000 claims abstract description 62
- 230000000996 additive effect Effects 0.000 claims abstract description 52
- 239000003999 initiator Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 29
- 125000002091 cationic group Chemical group 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical group CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims abstract description 11
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- JHUFGBSGINLPOW-UHFFFAOYSA-N 3-chloro-4-(trifluoromethoxy)benzoyl cyanide Chemical compound FC(F)(F)OC1=CC=C(C(=O)C#N)C=C1Cl JHUFGBSGINLPOW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 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 8
- 238000006243 chemical reaction Methods 0.000 claims description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 19
- 239000000047 product Substances 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical group [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical group [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 claims description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 5
- FZGFBJMPSHGTRQ-UHFFFAOYSA-M trimethyl(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCOC(=O)C=C FZGFBJMPSHGTRQ-UHFFFAOYSA-M 0.000 claims description 5
- -1 N-dimethylacrylamide Chemical compound 0.000 claims description 3
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- 239000003002 pH adjusting agent Substances 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 8
- 150000003839 salts Chemical class 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 13
- 239000013505 freshwater Substances 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229940092782 bentonite Drugs 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 3
- 238000012854 evaluation process Methods 0.000 description 3
- 238000009775 high-speed stirring Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229940080314 sodium bentonite Drugs 0.000 description 3
- 229910000280 sodium bentonite Inorganic materials 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 2
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 101000832669 Rattus norvegicus Probable alcohol sulfotransferase Proteins 0.000 description 1
- 102100021913 Sperm-associated antigen 8 Human genes 0.000 description 1
- 101710098579 Sperm-associated antigen 8 Proteins 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000012966 redox initiator Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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
- 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
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
-
- 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
- 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
-
- 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
- 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
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a preparation method of a fluid loss additive and the fluid loss additive, and belongs to the technical field of drilling. The preparation method comprises the following steps: carrying out polymerization reaction by using the preparation raw materials to obtain the filtrate reducer; the preparation raw materials comprise the following components in parts by weight: 5-20 parts of first anionic monomer, 15-22 parts of second anionic monomer, 18-30 parts of hydrophobic monomer, 4-15 parts of cationic monomer, 0.6-0.8 part of initiator, 40-60 parts of water and 12-20 parts of pH regulator. The first anionic monomer is maleic anhydride and/or acrylic acid; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate. The prepared filtrate reducer not only can resist temperature and salt, but also is safer and more environment-friendly, and is particularly suitable for deep well or ultra-deep well operation.
Description
Technical Field
The invention relates to a drilling technology, in particular to a preparation method of a fluid loss additive and the fluid loss additive.
Background
Fluid loss additives are commonly used in drilling fluids during drilling operations to perform the following functions: the efficiency of the fracturing fluid is improved, the using amount of the fracturing fluid is reduced, and the cost of the fracturing fluid is reduced; the method is beneficial to forming long and wide cracks, improves the sand ratio and enables the cracks to have higher flow conductivity; the mixed flow and stagnation of the fracturing fluid in the oil-gas layer are reduced, and the damage to the oil-gas layer is reduced. And the damage of the fracturing fluid to the water-sensitive oil-gas layer is reduced. Therefore, it is necessary to provide a fluid loss additive.
In the related art, fluid loss additives include starch fluid loss additives, cellulose fluid loss additives, resin fluid loss additives, and acrylic fluid loss additives. For oil and gas wells with deep well bores and large bottom temperature, high-temperature resistant sulfomethyl phenolic resin or sulfonated phenolic resin fluid loss additives are generally used.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the sulfomethyl phenolic resin or sulfonated phenolic resin filtrate reducer has poor environmental protection.
Disclosure of Invention
In view of this, the present invention provides a preparation method of a fluid loss additive and a fluid loss additive, which can solve the above technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, an embodiment of the present invention provides a preparation method of a fluid loss additive, where the preparation method of the fluid loss additive includes: providing preparation raw materials, and carrying out polymerization reaction by using the preparation raw materials to obtain the filtrate reducer;
the preparation raw materials comprise the following components in parts by weight: 5-20 parts of a first anionic monomer, 15-22 parts of a second anionic monomer, 18-30 parts of a hydrophobic monomer, 4-15 parts of a cationic monomer, 0.6-0.8 part of an initiator, 40-60 parts of water and 12-20 parts of a pH regulator;
the first anionic monomer is maleic anhydride and/or acrylic acid;
the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate.
In some possible implementations, the performing a polymerization reaction using the preparation raw material to obtain the fluid loss additive includes:
uniformly mixing the first anionic monomer, the second anionic monomer, the hydrophobic monomer, the cationic monomer and the water in a reaction vessel;
adding the pH regulator into the reaction container, stirring and introducing nitrogen for treatment;
continuously adding the initiator into the reaction container, uniformly stirring, and heating to a set temperature for reaction to obtain a gel product;
and (3) sequentially granulating, drying and crushing the gel product to obtain the filtrate reducer.
In some possible implementations, the set temperature is 30 ℃ to 50 ℃.
In some possible implementations, the drying is performed at a temperature of 80 ℃ to 120 ℃.
In some possible implementations, the hydrophobic monomer is selected from at least one of acrylamide, N-dimethylacrylamide, N-diethylacrylamide.
In some possible implementations, the cationic monomer is selected from methacryloyloxyethyl trimethyl ammonium chloride and/or acryloyloxyethyl trimethyl ammonium chloride.
In some possible implementations, the initiator is a redox initiator and the mass ratio of oxidizing agent to reducing agent is 1: 1.
In some possible implementations, the oxidizing agent is potassium persulfate or ammonium persulfate;
the reducing agent is sodium bisulfite or sodium sulfite.
In some possible implementations, the PH adjuster is selected from KOH, NaOH, Ca (OH)2At least one of (1).
On the other hand, the embodiment of the invention provides a fluid loss additive, which is prepared by any one of the preparation methods.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the preparation method of the fluid loss agent provided by the embodiment of the invention, the used preparation raw materials comprise a first anionic monomer, a second anionic monomer, a hydrophobic monomer and a cationic monomer, and the first anionic monomer is maleic anhydride and/or acrylic acid; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate. The components can be subjected to polymerization reaction under the action of an initiator to obtain the fluid loss additive. Under the synergistic compounding effect of the components, the prepared fluid loss additive not only can resist temperature and salt, but also is safer and more environment-friendly, and is particularly suitable for deep well or ultra-deep well operation. The fluid loss agent prepared by the embodiment of the invention is compounded with bentonite, can achieve a good fluid loss effect, does not need other auxiliary reagents, and has the advantages of low addition amount, good fluid loss effect and the like.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clear, embodiments of the present invention will be described in further detail below.
In one aspect, an embodiment of the present invention provides a method for preparing a fluid loss additive, where the method for preparing a fluid loss additive includes: providing preparation raw materials, and carrying out polymerization reaction by using the preparation raw materials to obtain the filtrate reducer.
Wherein the preparation raw materials comprise the following components in parts by weight: 5-20 parts of a first anionic monomer, 15-22 parts of a second anionic monomer, 18-30 parts of a hydrophobic monomer, 4-15 parts of a cationic monomer, 0.6-0.8 part of an initiator, 40-60 parts of water and 12-20 parts of a pH regulator;
wherein the first anionic monomer is maleic anhydride and/or acrylic acid;
the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate.
Illustratively, the parts by weight of the first anionic monomer include, but are not limited to: 10 parts, 15 parts, 17 parts, 18 parts, 19 parts, 20 parts and the like;
the parts by weight of the second anionic monomer include, but are not limited to: 15 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts and the like;
the weight parts of the hydrophobic monomer include but are not limited to: 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 25 parts, 27 parts, 30 parts and the like;
parts by weight of cationic monomer include, but are not limited to: 5 parts, 7 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts and the like;
the parts by weight of the initiator include, but are not limited to: 0.6 part, 0.65 part, 0.7 part, 0.73 part, 0.75 part, 0.78 part, 0.8 part and the like;
the parts by weight of the pH regulator include but are not limited to: 12 parts, 13 parts, 14 parts, 15 parts, 17 parts, 18 parts, 19 parts, 20 parts and the like;
the parts by weight of water include but are not limited to: 40 parts, 43 parts, 45 parts, 47 parts, 50 parts, 55 parts, 58 parts, 60 parts and the like.
In some possible implementations, the first anionic monomer is maleic anhydride alone, or the first anionic monomer is acrylic acid alone, or the first anionic monomer is both maleic anhydride and acrylic acid, and the mass ratio of the two may be 1: 0.5-2.
In some possible implementations, the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid alone, or the second anionic monomer is sodium allylsulfonate alone, or the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate simultaneously, and the mass ratio of the two can be 1: 0.5-2.
According to the preparation method of the fluid loss agent provided by the embodiment of the invention, the used preparation raw materials comprise a first anionic monomer, a second anionic monomer, a hydrophobic monomer and a cationic monomer, and the first anionic monomer is maleic anhydride and/or acrylic acid; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate. The components can be subjected to polymerization reaction under the action of an initiator to obtain the fluid loss additive. Under the synergistic compounding effect of the components, the prepared fluid loss additive not only can resist temperature and salt, but also is safer and more environment-friendly, and is particularly suitable for deep well or ultra-deep well operation. The fluid loss agent prepared by the embodiment of the invention is compounded with bentonite, can achieve a good fluid loss effect, does not need other auxiliary reagents, and has the advantages of low addition amount, good fluid loss effect and the like.
In some possible implementations, the "polymerization using preparation raw materials to obtain a fluid loss additive" according to the embodiments of the present invention includes the following steps:
step 1: uniformly mixing a first anionic monomer, a second anionic monomer, a hydrophobic monomer, a cationic monomer and water in a reaction container.
Step 2: a pH regulator was added to the reaction vessel, stirred and purged with nitrogen.
And step 3: and (3) continuously adding an initiator into the reaction vessel, uniformly stirring, and heating to a set temperature for reaction to obtain a gel product.
And 4, step 4: and (4) sequentially granulating, drying and crushing the gel product to obtain the filtrate reducer.
The first anionic monomer, the second anionic monomer, the hydrophobic monomer and the cationic monomer are fully and uniformly mixed through the step 1, then the PH of the reaction system is adjusted through the step 2 to provide an adaptive reaction environment, and meanwhile, the nitrogen is introduced into the reaction system in the step 2 to remove air, mainly to remove oxygen and moisture in the air, so that each reaction monomer is prevented from being oxidized at high temperature.
Polymerization of each of the above monomers is initiated by adding an initiator to the reaction vessel to produce the fluid loss additive desired in embodiments of the present invention, via step 3.
Through step 4, the gel-like fluid loss additive is granulated, dried and pulverized to make a shape convenient for storage and use.
In the embodiment of the invention, the hydrophobic monomer is at least one selected from acrylamide, N-dimethylacrylamide and N, N-diethylacrylamide. The hydrophobic monomer is beneficial to improving the hydrophobic property of the fluid loss additive and ensures that the fluid loss has good fluid loss reducing effect.
In the embodiment of the invention, the cationic monomer is selected from methacryloyloxyethyl trimethyl ammonium chloride and/or acryloyloxyethyl trimethyl ammonium chloride, and the high-temperature resistance effect of the prepared fluid loss additive can be optimized by using the cationic monomer.
In the embodiment of the invention, the initiator used is an oxidation-reduction initiator, the mass ratio of the oxidizing agent to the reducing agent is 1:1, and the oxidizing agent is potassium persulfate or ammonium persulfate; the reducing agent is sodium bisulfite or sodium sulfite. The initiator of the above kind is selected to obtain better initiating effect.
In some possible implementations, the pH adjusting agent is selected from KOH, NaOH, Ca (OH)2At least one of (1).
When the polymerization reaction is carried out by the initiator, the reaction temperature is set to 30 to 50 ℃ such as 30 ℃, 35 ℃, 40 ℃, 45 ℃ and 50 ℃. At the above reaction temperature, not only can each monomer be sufficiently polymerized, but also occurrence of side reactions can be avoided.
And (3) sequentially granulating, drying and crushing the gel product to obtain the filtrate reducer, wherein the gel product can be granulated by a knife cutting mode. And after the granulation is finished, drying at the temperature of 80-120 ℃ to ensure that the moisture in the granules is completely evaporated.
Illustratively, the drying temperature includes, but is not limited to: 80 deg.C, 85 deg.C, 90 deg.C, 95 deg.C, 100 deg.C, 105 deg.C, 110 deg.C, 120 deg.C, etc.
In some possible implementations, the particle size of the fluid loss additive after pulverization can be between 0.04mm and 0.2 mm.
In the embodiment of the invention, the crushed fluid loss additive is white or light yellow powder, and the fluid loss additive is colorless transparent liquid when dissolved in water.
In some possible implementation manners, after the first anionic monomer, the second anionic monomer, the hydrophobic monomer, the cationic monomer and water are uniformly mixed in a reaction container, adding a pH regulator into the reaction container, uniformly stirring, and introducing nitrogen for 1-2 hours.
And continuously adding an initiator into the reaction container, uniformly stirring, heating to 30-50 ℃ and reacting for 4-8 hours to obtain a gel product.
And sequentially granulating, drying and crushing the obtained gel product to obtain the high-temperature-resistant water-based drilling fluid filtrate reducer, wherein the drying temperature is 80-120 ℃.
On the other hand, the embodiment of the invention also provides a fluid loss additive, which is prepared by any one of the preparation methods.
The fluid loss additive provided by the embodiment of the invention is obviously different from sulfonated fluid loss additives (SPNH, SMP-1 and SMP-2), and the fluid loss additive provided by the embodiment of the invention not only can resist high temperature and salt, but also is environment-friendly, has no biotoxicity, heavy metal and good and controllable rheological property, and can achieve the purposes of safe drilling and environment protection. The fluid loss agent provided by the embodiment of the invention can achieve a good fluid loss effect by compounding with bentonite, does not need other auxiliary reagents, and has the advantages of low addition and good fluid loss effect.
The invention will be further described by the following specific examples:
example 1
This example 1 provides a fluid loss additive prepared by the following method:
step 101: providing a preparation raw material, wherein the preparation raw material comprises the following components in parts by weight: 10 parts of first anionic monomer, 21 parts of second anionic monomer, 19 parts of hydrophobic monomer, 8 parts of cationic monomer, 0.6 part of initiator, 45 parts of water and 20 parts of pH regulator.
Wherein the first anionic monomer is maleic anhydride; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid; the hydrophobic monomer is selected from acrylamide and N, N-dimethylacrylamide; the cationic monomer is selected from methacryloyloxyethyl trimethyl ammonium chloride; the initiator is ammonium persulfate and sodium bisulfite with the mass ratio of 1: 1; the pH regulator is selected from Ca (OH)2。
Step 102: uniformly mixing a first anionic monomer, a second anionic monomer, a hydrophobic monomer, a cationic monomer and water in a reaction container.
Step 103: adding a pH regulator into the reaction vessel, stirring and introducing nitrogen for treatment, wherein the nitrogen is introduced for 2 hours.
Step 104: and (3) continuously adding an initiator into the reaction vessel, uniformly stirring, and heating to 40 ℃ for reaction to obtain a gel product.
Step 105: and (3) sequentially granulating, drying at 100 ℃ and crushing the gel product to obtain the filtrate loss reducer.
Through a biotoxicity test, the filtrate reducer provided by the embodiment 1 is free of biotoxicity and heavy metals, and is safe and environment-friendly.
Example 2
This example 2 provides a fluid loss additive prepared by the following preparation method:
step 201: providing a preparation raw material, wherein the preparation raw material comprises the following components in parts by weight: 18 parts of first anionic monomer, 22 parts of second anionic monomer, 25 parts of hydrophobic monomer, 12 parts of cationic monomer, 0.8 part of initiator, 50 parts of water and 18 parts of pH regulator.
Wherein the first anionic monomer is acrylic acid; the second anionic monomer is sodium allylsulfonate; the hydrophobic monomer is selected from acrylamide; the cationic monomer is selected from methacryloyloxyethyl trimethyl ammonium chloride; potassium persulfate and sodium bisulfite with the initiator mass ratio of 1: 1; the pH regulator is selected from KOH.
Step 202: uniformly mixing a first anionic monomer, a second anionic monomer, a hydrophobic monomer, a cationic monomer and water in a reaction container.
Step 203: adding a pH regulator into the reaction vessel, stirring and introducing nitrogen for treatment, wherein the nitrogen is introduced for 1.5 h.
Step 204: and (3) continuously adding an initiator into the reaction vessel, uniformly stirring, and heating to 50 ℃ for reaction to obtain a gel product.
Step 205: and (3) sequentially granulating, drying at 90 ℃ and crushing the gel product to obtain the filtrate loss reducer.
The biotoxicity test shows that the filtrate reducer provided by the embodiment 2 is free of biotoxicity and heavy metals, and is safe and environment-friendly.
Example 3
This example 3 provides a fluid loss additive prepared by the following method:
step 301: providing a preparation raw material, wherein the preparation raw material comprises the following components in parts by weight: 15 parts of first anionic monomer, 18 parts of second anionic monomer, 22 parts of hydrophobic monomer, 4 parts of cationic monomer, 0.7 part of initiator, 55 parts of water and 20 parts of pH regulator.
Wherein the first anionic monomer is maleic anhydride; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid; the hydrophobic monomer is selected from N, N-diethyl acrylamide; the cationic monomer is selected from acryloyloxyethyl trimethyl ammonium chloride; ammonium persulfate and sodium bisulfite with the initiator mass ratio of 1: 1; the pH regulator is selected from KOH.
Step 302: uniformly mixing a first anionic monomer, a second anionic monomer, a hydrophobic monomer, a cationic monomer and water in a reaction container.
Step 303: adding a pH regulator into the reaction vessel, stirring and introducing nitrogen for treatment, wherein the nitrogen is introduced for 2 hours.
Step 304: and (3) continuously adding an initiator into the reaction vessel, uniformly stirring, and heating to 45 ℃ for reaction to obtain a gel product.
Step 305: and (3) sequentially granulating, drying at 100 ℃ and crushing the gel product to obtain the filtrate loss reducer.
According to a biotoxicity test, the filtrate reducer provided by the embodiment 3 is free of biotoxicity and heavy metals, and is safe and environment-friendly.
Example 4
This example 4 provides a fluid loss additive prepared by the following method:
step 401: providing a preparation raw material, wherein the preparation raw material comprises the following components in parts by weight: 20 parts of first anionic monomer, 20 parts of second anionic monomer, 30 parts of hydrophobic monomer, 13 parts of cationic monomer, 0.7 part of initiator, 55 parts of water and 15 parts of pH regulator.
Wherein the first anionic monomer is maleic anhydride and acrylic acid with the mass ratio of 1: 1; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid; the hydrophobic monomer is N, N-dimethylacrylamide; the cationic monomer is selected from methacryloyloxyethyl trimethyl ammonium chloride and acryloyloxyethyl trimethyl ammonium chloride in a mass ratio of 1: 1; the initiator is potassium persulfate and sodium bisulfite with the mass ratio of 1: 1; the pH regulator is selected from NaOH.
Step 402: uniformly mixing a first anionic monomer, a second anionic monomer, a hydrophobic monomer, a cationic monomer and water in a reaction container.
Step 403: adding a pH regulator into the reaction vessel, stirring and introducing nitrogen for treatment, wherein the nitrogen is introduced for 2 hours.
Step 404: and (3) continuously adding an initiator into the reaction vessel, uniformly stirring, and heating to 45 ℃ for reaction to obtain a gel product.
Step 405: and (3) sequentially granulating, drying at 90 ℃ and crushing the gel product to obtain the filtrate loss reducer.
The biotoxicity test shows that the filtrate reducer provided by the embodiment 4 has no biotoxicity, no heavy metal, safety and environmental protection.
Test example 1
The test example 1 evaluates the temperature resistance and the fluid loss reduction effect of the fluid loss additive provided in examples 1 to 4, and the evaluation process and the evaluation result are as follows:
(1) performance evaluation in fresh water-based slurries
Preparing fresh water base slurry with the mass concentration of 4 percent:
adding 400mL of water into a high-speed stirring cup, adding 0.48g of sodium carbonate and 16g of test sodium bentonite into the water under the stirring condition, stirring at a high speed for 20min until the mixture is uniform, sealing and standing for 24 h.
Preparing experimental slurry:
the filtrate reducers prepared in examples 1 to 4 are respectively added into the fresh water-based slurry with the mass concentration of 4 percent to prepare experimental slurry with the concentration of 0.01g/mL, the experimental slurry is cooled and taken out after being aged for 16 hours at 200 ℃, and the rheological property and the high-temperature high-pressure filtrate loss FL HTHP are measured according to GB/T16783.1, wherein the rheological property comprises: apparent viscosity AV, plastic viscosity PV and dynamic shear force YP. The test results are shown in table 1:
TABLE 1
As can be seen from table 1, after the fluid loss additives provided in examples 1 to 4 were added to the fresh water base slurry, the measured decrease magnitudes of HTHP fluid loss were all large, which indicates that good fluid loss reduction effects were obtained by using the fluid loss additives provided in examples 1 to 4.
As can be seen from table 1, after the fluid loss additive provided in examples 1 to 4 is added to the fresh water-based slurry, the fluid loss is reduced from 46.0mL to less than 18mL by aging at 200 ℃/16h, which indicates that the fluid loss additive provided in examples 1 to 4 has a good high-temperature resistance fluid loss effect.
Test example 2
This test example 2 evaluates the fluid loss reducing effect of the fluid loss additive provided in example 1 with different concentrations in fresh water base slurry, and the evaluation process and the evaluation result are as follows:
preparing fresh water base slurry with the mass concentration of 4 percent:
adding 400mL of water into a high-speed stirring cup, adding 0.48g of sodium carbonate and 16g of test sodium bentonite into the water under the stirring condition, stirring at a high speed for 20min until the mixture is uniform, sealing and standing for 24 h.
Preparing experimental slurry:
the filtrate reducer prepared in example 1 is added into the fresh water-based slurry with the mass concentration of 4% respectively to prepare experimental slurries with different concentrations, the concentrations of the experimental slurries are 0.005g/mL, 0.01g/mL, 0.02g/mL and 0.03g/mL respectively, the rheological property and the water loss amount of the experimental slurries are tested by GB/T16783.1 in a rolling manner at 200 ℃/16h, and the results are shown in Table 2.
TABLE 2
As can be seen from Table 2, the fluid loss is reduced with the increase of the fluid loss additive after aging at 200 ℃/16h, and the fluid loss additive in the fresh water base slurry has good fluid loss reducing effect when the fluid loss additive is more than or equal to 0.01 g/mL.
Test example 3
This test example 3 evaluates the fluid loss reducing effect of the fluid loss additive provided in example 1 in saturated saline base slurry at different concentrations, and the evaluation process and the evaluation result are as follows:
preparing saturated saline water base slurry with mass concentration of 4%:
adding 400mL of water into a high-speed stirring cup, adding 0.48g of sodium carbonate and 16g of test sodium bentonite into the water under the stirring condition, adding NaCl to saturation, stirring at a high speed for 20min until the mixture is uniform, sealing and standing for 24 h.
Preparing experimental slurry:
the filtrate reducers prepared in example 1 are respectively added into the saturated saline water-based slurry with the mass concentration of 4% to prepare experimental slurries with different concentrations, the concentrations of the experimental slurries are respectively 0.005g/mL, 0.01g/mL, 0.02g/mL and 0.03g/mL, the rheological property and the water loss amount of the experimental slurries are tested by rolling at 200 ℃/16h according to the method shown in GB/T16783.1, and the results are shown in Table 3.
TABLE 3
As can be seen from Table 3, in the saturated saline base slurry, as the addition amount of the fluid loss additive increases, after aging at 200 ℃/16h, the fluid loss decreases, when the addition amount of the fluid loss additive is more than or equal to 0.01g/mL, the fluid loss additive has good fluid loss reduction effect, and when the addition amount of the product is 0.03g/mL, the fluid loss is 23.6mL, which indicates that the fluid loss additive provided in example 1 has certain salt resistance.
In conclusion, the high-temperature-resistant drilling fluid filtrate reducer prepared by the method provided by the embodiment of the invention has a good application prospect in the drilling process of deep wells and ultra-deep wells.
In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The term "and/or" in the embodiment of the present invention is only one kind of association relationship describing an associated object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a fluid loss additive is characterized by comprising the following steps: providing preparation raw materials, and carrying out polymerization reaction by using the preparation raw materials to obtain the filtrate reducer;
the preparation raw materials comprise the following components in parts by weight: 5-20 parts of a first anionic monomer, 15-22 parts of a second anionic monomer, 18-30 parts of a hydrophobic monomer, 4-15 parts of a cationic monomer, 0.6-0.8 part of an initiator, 40-60 parts of water and 12-20 parts of a pH regulator;
the first anionic monomer is maleic anhydride and/or acrylic acid;
the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium allylsulfonate.
2. The method for preparing the fluid loss additive according to claim 1, wherein the step of obtaining the fluid loss additive by using the preparation raw materials to perform polymerization reaction comprises the following steps:
uniformly mixing the first anionic monomer, the second anionic monomer, the hydrophobic monomer, the cationic monomer and the water in a reaction vessel;
adding the pH regulator into the reaction container, stirring and introducing nitrogen for treatment;
continuously adding the initiator into the reaction container, uniformly stirring, and heating to a set temperature for reaction to obtain a gel product;
and (3) sequentially granulating, drying and crushing the gel product to obtain the filtrate reducer.
3. The method for preparing a fluid loss additive according to claim 2, wherein the set temperature is 30 ℃ to 50 ℃.
4. The method for preparing a fluid loss additive according to claim 2, wherein the drying is carried out at a temperature of 80 ℃ to 120 ℃.
5. The method of claim 1, wherein the hydrophobic monomer is at least one selected from the group consisting of acrylamide, N-dimethylacrylamide, and N, N-diethylacrylamide.
6. Method for the preparation of a fluid loss additive according to claim 1, wherein the cationic monomer is selected from methacryloyloxyethyl trimethyl ammonium chloride and/or acryloyloxyethyl trimethyl ammonium chloride.
7. The method of claim 1, wherein the initiator is an oxidation-reduction initiator and the mass ratio of the oxidizing agent to the reducing agent is 1: 1.
8. The method for preparing a fluid loss additive according to claim 7, wherein the oxidant is potassium persulfate or ammonium persulfate;
the reducing agent is sodium bisulfite or sodium sulfite.
9. The method of claim 1, wherein the pH modifier is selected from KOH, NaOH, Ca (OH)2At least one of (1).
10. A fluid loss additive, which is prepared by the preparation method of any one of claims 1 to 9.
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