CN118530704B - Viscosity reducer for drilling fluid suitable for deep well and preparation method thereof - Google Patents
Viscosity reducer for drilling fluid suitable for deep well and preparation method thereof Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 56
- 239000012530 fluid Substances 0.000 title claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 41
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 41
- 229920000642 polymer Polymers 0.000 claims abstract description 35
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 21
- -1 methacryloyl ethyl sulfobetaine Chemical compound 0.000 claims abstract description 14
- 239000000178 monomer Substances 0.000 claims abstract description 14
- 230000009467 reduction Effects 0.000 claims abstract description 13
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims abstract description 13
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229940117986 sulfobetaine Drugs 0.000 claims abstract description 12
- 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 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 28
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 19
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical group N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 12
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical group COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 claims description 8
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 7
- WBUSESIMOZDSHU-UHFFFAOYSA-N 3-(4,5-dihydroimidazol-1-yl)propyl-triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN1CCN=C1 WBUSESIMOZDSHU-UHFFFAOYSA-N 0.000 claims description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 7
- 239000003999 initiator Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000010025 steaming Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 5
- 238000002390 rotary evaporation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 239000002079 double walled nanotube Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 abstract description 8
- 230000002209 hydrophobic effect Effects 0.000 abstract description 7
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 abstract description 4
- PARWUHTVGZSQPD-UHFFFAOYSA-N phenylsilane Chemical compound [SiH3]C1=CC=CC=C1 PARWUHTVGZSQPD-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000013505 freshwater Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical group C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
- C08F212/30—Sulfur
-
- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to the technical field of drilling fluid, in particular to a viscosity reducer for drilling fluid applicable to deep wells and a preparation method thereof. The viscosity reducer for the drilling fluid suitable for the deep well is prepared by mixing an amphoteric viscosity reducing polymer and a difunctional carbon nano tube; the amphoteric viscosity reduction polymer is prepared by polymerization reaction of monomer raw materials, wherein the monomer raw materials comprise acrylamide, acrylic acid, sodium p-styrenesulfonate and methacryloyl ethyl sulfobetaine; the double-functional carbon nanotube is obtained by modifying the carbon nanotube by adopting an amphoteric silane coupling agent containing imidazole cations and a hydrophobic phenyl silane coupling agent. The viscosity reducer for drilling fluid provided by the invention has excellent temperature resistance and salt resistance, and is suitable for a mining environment which is increasingly complex in a deep well.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to a viscosity reducer for drilling fluid applicable to deep wells and a preparation method thereof.
Background
The viscosity reducer is a chemical agent capable of reducing the viscosity and shear force of the drilling fluid and adjusting the rheological property of the drilling fluid. It is used as an important chemical additive in petroleum drilling process, has important functions of regulating the rheological property of drilling fluid, maintaining the performance of the drilling fluid and protecting hydrocarbon reservoir. Although the solid phase control system can remove harmful solid phase in the drilling fluid, can effectively regulate the rheological property of the drilling fluid and reduce the dosage of the viscosity reducer, the solid control equipment on site is not ideal, and the function of the viscosity reducer is very important.
With the longitudinal development of petroleum exploration, the number of deep wells and ultra-deep wells with the temperature exceeding 200 ℃ is also increased, and drilling conditions of drilling tools in stratum are increasingly complex. In the drilling process, as the drilling depth increases, the temperature in a shaft is obviously increased, the thickening problem of drilling fluid is more and more serious, and the viscosity reducer plays an important role in regulating the rheological property of the drilling fluid. Among the numerous types of drilling fluid additives, the polymer additive has high development speed and high adjustability, and people can synthesize the high-temperature-resistant viscosity reducer which meets the environmental requirements and is suitable for complex wells by selecting monomers with characteristic functional groups.
Patent technical document CN202211409571.1 discloses a thick oil viscosity reducer composition and a preparation method thereof. The thick oil polymer viscosity reducer is formed by combining a low molecular weight amphiphilic polymer and a nano hydrophobic modified material. The preparation method of the low molecular weight amphiphilic polymer comprises the steps of carrying out polymerization reaction on an acrylamide hydrophilic monomer, a sulfonic acid group-containing temperature-resistant monomer, a rigid structure-containing hydrophobic monomer, an initiator and a polymerization inhibitor under the condition of deoxidization, washing, drying and crushing a reaction product to obtain the low molecular weight amphiphilic polymer; the nano hydrophobic modified material is prepared by performing hydrophobic modification on the nano material by a coupling agent and adding an amphiphilic surfactant to further improve dispersibility. The thick oil viscosity reducer composition formed by the invention can be used for reducing viscosity of thick oil conveyed by a pipe. However, the viscosity reducer for the thickened oil polymer contains anionic groups, when the salt content in the thickened oil is too high, the hydration capacity of the polymer is weakened, the molecular chains curl, hydrophobic association phenomenon occurs, and even the end face of clay is caused to coalesce to form a network structure, so that the viscosity is increased.
Disclosure of Invention
Therefore, the invention aims to provide a viscosity reducer for drilling fluid, which is applicable to deep wells, and a preparation method thereof, so as to provide the viscosity reducer for drilling fluid, which has excellent temperature resistance and salt resistance, and is applicable to increasingly complex exploitation environments in deep wells.
Based on the above purpose, the invention provides a viscosity reducer for drilling fluid suitable for deep wells, which is characterized by being prepared by mixing an amphoteric viscosity reducing polymer and a difunctional carbon nano tube.
Further, the weight ratio of the amphoteric viscosity reduction polymer to the difunctional carbon nano tube is 20-30:0.5-1.
Further, the amphoteric viscosity reduction polymer is prepared by polymerization of monomer raw materials, wherein the monomer raw materials comprise acrylamide, acrylic acid, sodium p-styrenesulfonate and methacryloyl ethyl sulfobetaine.
Preferably, the weight ratio of the acrylamide to the acrylic acid to the sodium p-styrenesulfonate to the methacryloyl ethyl sulfobetaine is 10-15:2-3:15-25:3-5.
More preferably, the weight ratio of the acrylamide, the acrylic acid, the sodium p-styrenesulfonate and the methacryloyl ethyl sulfobetaine is 12:2.4:20:4.
Further, the preparation method of the difunctional carbon nano tube comprises the following steps: dispersing the carbon nano tube in absolute ethyl alcohol, then regulating the pH value to 9-10 by ammonia water, adding an amphoteric silane coupling agent and phenyl triethoxysilane, heating to 50-60 ℃, stirring for 12-14h, centrifuging and washing to obtain the double-functional carbon nano tube.
Further, the weight ratio of the carbon nano tube to the absolute ethyl alcohol to the amphoteric silane coupling agent to the phenyltriethoxysilane is 1:20-30:0.3-0.5:0.1-0.2.
Preferably, the carbon nanotubes are double-walled carbon nanotubes, the diameter is 20-40nm, and the length is 1-2 mu m.
Preferably, the mass fraction of the ammonia water is 28%.
Further, the preparation method of the amphoteric silane coupling agent comprises the following steps: adding triethoxy-3- (2-imidazoline-1-yl) propyl silane and 1, 3-propane sultone into anhydrous acetone, carrying out reflux reaction for 16-18h under nitrogen atmosphere, and carrying out rotary evaporation after the reaction is finished to obtain the amphoteric silane coupling agent.
Further, the weight ratio of the triethoxy-3- (2-imidazolin-1-yl) propyl silane, the 1, 3-propane sultone and the anhydrous acetone is 1:0.48-0.55:20-30.
Preferably, the specific preparation method of the amphoteric viscosity reduction polymer comprises the following steps: under nitrogen atmosphere, adding monomer raw materials into ethyl acetate, heating to 60-65 ℃, stirring for 20-30min, then adding an initiator, heating to 80-90 ℃, stirring for reaction for 8-10h, then adding a polymerization inhibitor, stirring for 10-20min, steaming, washing and drying to obtain the amphoteric viscosity-reducing polymer.
Preferably, the weight ratio of the monomer raw materials to the ethyl acetate to the initiator to the polymerization inhibitor is 30-48:150-250:1-2:1.2-1.8.
Preferably, the initiator is azobisisobutyronitrile.
Preferably, the polymerization inhibitor is para-hydroxyanisole.
Furthermore, the temperature resistance of the viscosity reducer for the drilling fluid suitable for the deep well can reach 260 ℃.
Furthermore, the invention also provides a preparation method of the viscosity reducer for the drilling fluid suitable for the deep well, which comprises the following steps: and uniformly mixing the amphoteric viscosity reducing polymer and the difunctional carbon nano tube to obtain the viscosity reducer for drilling fluid applicable to deep wells.
The invention has the beneficial effects that:
the viscosity reducer for drilling fluid suitable for deep wells is prepared by compounding the difunctional carbon nanotubes and the amphoteric viscosity reducing polymer, wherein the difunctional carbon nanotubes are obtained by modifying the carbon nanotubes by adopting the high-activity amphoteric silane coupling agent containing imidazole cations and the hydrophobic phenylsilane coupling agent, so that the viscosity reducer can be effectively compounded with the amphoteric viscosity reducing polymer, and the viscosity reducing performance, the temperature resistance and the salt resistance can be synergistically improved.
According to the invention, the amphoteric viscosity-reducing polymer is synthesized by adopting the methacryloyl ethyl sulfobetaine and the sodium p-styrenesulfonate with certain steric hindrance, and the sulfobetaine group can form an ionic bond with the amphoteric silane coupling agent on the surface of the carbon nano tube, so that the dispersion of the carbon nano tube is improved, the sodium p-styrenesulfonate, phenyl and imidazolyl on the carbon nano tube have certain steric hindrance, the regulation of a space structure is facilitated, and the hydrophobicity of the phenyl is favorable for releasing free water in clay, so that the viscosity-reducing performance, the temperature resistance and the salt resistance are further improved.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
In the specific embodiment of the invention, the carbon nano tube is purchased from Shanghai Ala Biochemical technology Co., ltd, and the product number is C121257.
Example 1
(1) Adding 1g of triethoxy-3- (2-imidazoline-1-yl) propyl silane and 0.48g of 1, 3-propane sultone into 20g of anhydrous acetone, carrying out reflux reaction for 16h under nitrogen atmosphere, and carrying out rotary evaporation after the reaction is finished to obtain an amphoteric silane coupling agent;
(2) Dispersing 1g of carbon nano tube in 20g of absolute ethyl alcohol, then regulating the pH to 9.2 by using 28% ammonia water, adding 0.3g of amphoteric silane coupling agent and 0.1g of phenyl triethoxysilane, heating to 50 ℃, stirring for 12h, centrifuging and washing to obtain the difunctional carbon nano tube;
(3) Under nitrogen atmosphere, adding 10g of acrylamide, 2g of acrylic acid, 15g of sodium p-styrenesulfonate and 3g of methacryloyl ethyl sulfobetaine into 150g of ethyl acetate, heating to 60 ℃, stirring for 20min, then adding 1-2g of azobisisobutyronitrile, heating to 80 ℃, stirring for reacting for 8h, then adding 1.2g of p-hydroxyanisole, stirring for 10min, steaming, washing and drying to obtain an amphoteric viscosity-reducing polymer;
(4) And uniformly mixing 20g of the amphoteric viscosity reducing polymer and 0.5g of the difunctional carbon nano tube to obtain the viscosity reducer for the drilling fluid applicable to deep wells.
Example 2
(1) Adding 1g of triethoxy-3- (2-imidazoline-1-yl) propyl silane and 0.55g of 1, 3-propane sultone into 30g of anhydrous acetone, carrying out reflux reaction for 18h under nitrogen atmosphere, and carrying out rotary evaporation after the reaction is finished to obtain an amphoteric silane coupling agent;
(2) Dispersing 1g of carbon nano tube in 25g of absolute ethyl alcohol, then regulating the pH to 9.6 by using 28% ammonia water, adding 0.4g of amphoteric silane coupling agent and 0.15g of phenyl triethoxysilane, heating to 55 ℃, stirring for 12h, centrifuging and washing to obtain the difunctional carbon nano tube;
(3) Under nitrogen atmosphere, adding 12g of acrylamide, 2.4g of acrylic acid, 20g of sodium p-styrenesulfonate and 4g of methacryloyl ethyl sulfobetaine into 200g of ethyl acetate, heating to 60 ℃, stirring for 20min, then adding 1.5g of azobisisobutyronitrile, heating to 85 ℃, stirring for reacting for 8h, then adding 1.5g of p-hydroxyanisole, stirring for 10min, steaming, washing and drying to obtain an amphoteric viscosity-reducing polymer;
(4) And uniformly mixing 25g of the amphoteric viscosity reducing polymer and 0.75g of the difunctional carbon nano tube to obtain the viscosity reducer for the drilling fluid applicable to deep wells.
Example 3
(1) Adding 1g of triethoxy-3- (2-imidazoline-1-yl) propyl silane and 0.55g of 1, 3-propane sultone into 30g of anhydrous acetone, carrying out reflux reaction for 18h under nitrogen atmosphere, and carrying out rotary evaporation after the reaction is finished to obtain an amphoteric silane coupling agent;
(2) Dispersing 1g of carbon nano tube in 30g of absolute ethyl alcohol, then regulating the pH to 9.3 by using 28% ammonia water, adding 0.5g of amphoteric silane coupling agent and 0.2g of phenyl triethoxysilane, heating to 60 ℃, stirring for 14h, centrifuging and washing to obtain the difunctional carbon nano tube;
(3) Under nitrogen atmosphere, adding 15g of acrylamide, 3g of acrylic acid, 25g of sodium p-styrenesulfonate and 3-5g of methacryloyl ethyl sulfobetaine into 250g of ethyl acetate, heating to 65 ℃, stirring for 30min, then adding 2g of azobisisobutyronitrile, heating to 90 ℃, stirring for reacting for 10h, then adding 1.8g of p-hydroxyanisole, stirring for 20min, steaming, washing and drying to obtain an amphoteric viscosity-reducing polymer;
(4) And uniformly mixing 30g of the amphoteric viscosity reducing polymer and 1g of the difunctional carbon nano tube to obtain the viscosity reducer for the drilling fluid applicable to deep wells.
Comparative example 1:
Comparative example 1 differs from example 2 in that: the amphoteric silane coupling agent in the step (2) is replaced by phenyl triethoxysilane, and the rest steps are the same as those in the example 2, and are not repeated here.
Comparative example 2:
Comparative example 2 differs from example 2 in that: the phenyltriethoxysilane in step (2) is replaced by an amphoteric silane coupling agent, and the rest of the steps are the same as in example 2, and are not described here.
Comparative example 3:
(1) Under nitrogen atmosphere, adding 12g of acrylamide, 2.4g of acrylic acid, 20g of sodium p-styrenesulfonate and 4g of methacryloyl ethyl sulfobetaine into 200g of ethyl acetate, heating to 60 ℃, stirring for 20min, then adding 1.5g of azobisisobutyronitrile, heating to 85 ℃, stirring for reacting for 8h, then adding 1.5g of p-hydroxyanisole, stirring for 10min, steaming, washing and drying to obtain an amphoteric viscosity-reducing polymer;
(2) And uniformly mixing 25g of the amphoteric viscosity reducing polymer and 0.75g of the carbon nano tube to obtain the viscosity reducer for the drilling fluid.
Comparative example 4:
(1) Under nitrogen atmosphere, adding 12g of acrylamide, 2.4g of acrylic acid, 20g of sodium p-styrenesulfonate and 4g of methacryloyl ethyl sulfobetaine into 200g of ethyl acetate, heating to 60 ℃, stirring for 20min, then adding 1.5g of azobisisobutyronitrile, heating to 85 ℃, stirring for reacting for 8h, then adding 1.5g of p-hydroxyanisole, stirring for 10min, steaming, washing and drying to obtain an amphoteric viscosity-reducing polymer;
(2) The amphoteric viscosity reducing polymer is directly used as a viscosity reducer for drilling fluid.
Test example:
(1) Sample preparation:
Preparing fresh water-based slurry: 400mL of tap water is added into a cup, 2g of anhydrous sodium carbonate is added for full dissolution, then 40g of bentonite is slowly added, and after stirring for 2 hours at a high speed, the mixture is kept stand for hydration in a closed environment at 25 ℃ for standby;
Preparing a high-salt-content dilute water-based slurry: 400mL of tap water is added into a cup, 2g of anhydrous sodium carbonate, 2g of sodium chloride and 4g of calcium chloride are added for full dissolution, then 40g of bentonite is slowly added, and after stirring for 2 hours at a high speed, the mixture is kept stand for hydration in a closed environment at 25 ℃ for standby;
Preparing drilling fluid samples: 400mL of the two base slurries are taken, 2g of the viscosity reducer prepared in the examples and the comparative examples are respectively added into the two base slurries, and the two base slurries are stirred for 20min, so that the corresponding drilling fluid is obtained.
(2) And (3) performance detection:
Rheological parameters: the apparent viscosity and the plastic viscosity of the drilling fluid are calculated according to the industrial standard SY/T5621-93 'viscosity reducer evaluation program for water-based drilling fluid', the measuring temperature is 25 ℃, and the test result is shown in Table 1;
Filtrate loss reduction: measuring the filtrate loss of the drilling fluid by using a drilling fluid water loss meter, wherein the measurement temperature is 25 ℃, and the test result is shown in table 1;
Viscosity reduction rate: the drilling fluid and the viscosity reduction rate after aging the drilling fluid with a high Wen Fangun speed rotational viscometer are tested, the results are shown in table 1, and the viscosity reduction rate test formula is as follows:
Wherein is Reading the base slurry which is not treated by the viscosity reducer under a six-speed rotary viscometer; is a reading of the viscosity reducer treated base stock at a six-speed rotational viscometer.
Table 1 performance test data
Data analysis:
As can be seen from examples 1-3, the viscosity reducer for drilling fluid suitable for deep wells, which is prepared by the invention, has excellent viscosity reducing performance, can respectively reduce viscosity of 81.5% and 78.3% for fresh water base slurry and high-salt content fresh water base slurry at room temperature, and most importantly, can still reduce viscosity of 65.3% and 89.1% for fresh water base slurry and high-salt content fresh water base slurry at 260 ℃, which indicates that the viscosity reducer has excellent salt resistance and temperature resistance, and also has good filtration resistance, and can meet the complex bottom layer environment of deep wells.
From example 2 and comparative examples 1 to 4, it can be seen that the dual functionalization of the amphoteric silane coupling agent and the phenyltriethoxysilane on the carbon nanotubes can effectively improve viscosity reduction performance and temperature resistance and salt resistance, which is probably due to the fact that the dual functionalized carbon nanotubes can be more effectively compounded with the amphoteric viscosity reduction polymer to cooperatively break up a space network structure formed by clay, and meanwhile, the tubular structure can help to release wrapped free water, reduce flow friction resistance among clay particles, thereby reducing viscosity of drilling fluid, enhancing fluidity of the drilling fluid, and further improving viscosity reduction performance. And, the thermal conductivity of the carbon nanotube and the charge adjustment on the surface of the carbon nanotube are helpful to further improve the salt resistance and heat resistance of the carbon nanotube.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
Claims (9)
1. The viscosity reducer for the drilling fluid suitable for the deep well is characterized by being prepared by mixing an amphoteric viscosity reducing polymer and a difunctional carbon nano tube; the weight ratio of the amphoteric viscosity reduction polymer to the difunctional carbon nano tube is 20-30:0.5-1;
The amphoteric viscosity reduction polymer is prepared by polymerization reaction of monomer raw materials, wherein the monomer raw materials comprise acrylamide, acrylic acid, sodium p-styrenesulfonate and methacryloyl ethyl sulfobetaine;
the weight ratio of the acrylamide to the acrylic acid to the sodium p-styrenesulfonate to the methacryloyl ethyl sulfobetaine is 10-15:2-3:15-25:3-5;
the preparation method of the double-functional carbon nano tube comprises the following steps: dispersing the carbon nano tube in absolute ethyl alcohol, then regulating the pH value to 9-10 by ammonia water, adding an amphoteric silane coupling agent and phenyl triethoxysilane, heating to 50-60 ℃, stirring for 12-14h, centrifuging and washing to obtain the double-functional carbon nano tube;
the weight ratio of the carbon nano tube to the absolute ethyl alcohol to the amphoteric silane coupling agent to the phenyl triethoxysilane is 1:20-30:0.3-0.5:0.1-0.2;
The preparation method of the amphoteric silane coupling agent comprises the following steps: adding triethoxy-3- (2-imidazoline-1-yl) propyl silane and 1, 3-propane sultone into anhydrous acetone, carrying out reflux reaction for 16-18h under nitrogen atmosphere, and carrying out rotary evaporation after the reaction is finished to obtain an amphoteric silane coupling agent;
the weight ratio of the triethoxy-3- (2-imidazoline-1-yl) propyl silane, the 1, 3-propane sultone and the anhydrous acetone is 1:0.48-0.55:20-30.
2. The viscosity reducer for drilling fluid suitable for deep wells according to claim 1, wherein the specific preparation method of the amphoteric viscosity reducing polymer is as follows: under nitrogen atmosphere, adding monomer raw materials into ethyl acetate, heating to 60-65 ℃, stirring for 20-30min, then adding an initiator, heating to 80-90 ℃, stirring for reaction for 8-10h, then adding a polymerization inhibitor, stirring for 10-20min, steaming, washing and drying to obtain the amphoteric viscosity-reducing polymer.
3. The viscosity reducer for drilling fluid for deep wells according to claim 2, wherein the weight ratio of the monomer raw material, ethyl acetate, initiator and polymerization inhibitor is 30-48:150-250:1-2:1.2-1.8.
4. The viscosity reducer for drilling fluid for deep wells according to claim 2, wherein the initiator is azobisisobutyronitrile.
5. The viscosity reducer for drilling fluid for deep wells according to claim 2, wherein the polymerization inhibitor is p-hydroxyanisole.
6. The viscosity reducer for drilling fluid for deep wells according to claim 1, wherein the carbon nanotubes are double-walled carbon nanotubes having a diameter of 20-40nm and a length of 1-2 μm.
7. The viscosity reducer for drilling fluid for deep wells according to claim 1, wherein the mass fraction of the ammonia water is 28%.
8. The viscosity reducer for drilling fluid for deep wells according to claim 1, wherein the temperature resistance of the viscosity reducer for drilling fluid for deep wells can reach 260 ℃.
9. A method for preparing a viscosity reducer for drilling fluids for deep wells according to any one of claims 1 to 8, comprising the steps of: and uniformly mixing the amphoteric viscosity reducing polymer and the difunctional carbon nano tube to obtain the viscosity reducer for drilling fluid applicable to deep wells.
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