CN115572347A - High-temperature-resistant high-salt-resistant tackifying and shearing-improving agent for water-based drilling fluid and preparation method and application thereof - Google Patents
High-temperature-resistant high-salt-resistant tackifying and shearing-improving agent for water-based drilling fluid and preparation method and application thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 101
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- 238000005553 drilling Methods 0.000 title claims abstract description 88
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- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 239000000178 monomer Substances 0.000 claims abstract description 118
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- 238000005520 cutting process Methods 0.000 claims abstract description 30
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- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 24
- 125000005395 methacrylic acid group Chemical group 0.000 claims abstract description 21
- 125000002091 cationic group Chemical group 0.000 claims abstract description 19
- 238000010008 shearing Methods 0.000 claims description 53
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N dimethyl sulfoxide Natural products CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 50
- 230000001804 emulsifying effect Effects 0.000 claims description 50
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 6
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- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 claims description 3
- 238000010526 radical polymerization reaction Methods 0.000 claims description 3
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- 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 3
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical group [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 2
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- 230000000977 initiatory effect Effects 0.000 claims description 2
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 2
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- BWYYYTVSBPRQCN-UHFFFAOYSA-M sodium;ethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=C BWYYYTVSBPRQCN-UHFFFAOYSA-M 0.000 claims description 2
- 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 1
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- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical group OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 14
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- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 1
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- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 description 1
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- 229920003023 plastic Polymers 0.000 description 1
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- BWFJQOYMXHEGNQ-UHFFFAOYSA-M potassium;2-methyl-2-(prop-2-enoylamino)propane-1-sulfonate Chemical compound [K+].[O-]S(=O)(=O)CC(C)(C)NC(=O)C=C BWFJQOYMXHEGNQ-UHFFFAOYSA-M 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 229910001415 sodium ion Inorganic materials 0.000 description 1
- FWFUWXVFYKCSQA-UHFFFAOYSA-M sodium;2-methyl-2-(prop-2-enoylamino)propane-1-sulfonate Chemical compound [Na+].[O-]S(=O)(=O)CC(C)(C)NC(=O)C=C FWFUWXVFYKCSQA-UHFFFAOYSA-M 0.000 description 1
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 description 1
- 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 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 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 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
Images
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
-
- 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
Abstract
The invention provides a high-temperature-resistant high-salt-resistant tackifying shear strength improver for water-based drilling fluid and a preparation method and application thereof. According to the invention, the temperature-resistant and salt-resistant tackifying cutting agent is prepared by performing emulsion polymerization on an acrylamide monomer, a temperature-resistant and salt-resistant monomer, a cationic monomer, a methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA), and a chemical cross-linking agent triallyl, wherein the UPyMA monomer can form a quadruple hydrogen bond with stronger bond energy, so that the polymer has excellent high-temperature stability; the introduction of the acrylamide monomer increases the molecular weight of the polymer and endows the polymer with excellent tackifying capability; the introduction of the temperature-resistant and salt-resistant monomer enhances the temperature-resistant and salt-resistant hydration capacity of the polymer; the introduction of the cationic monomer significantly reduces the fluid loss. The tackifying and cutting-improving agent prepared by the invention still has excellent tackifying, cutting-improving and filtrate loss reducing performances after being aged in a high-salt (saturated salt) environment at a high temperature (200 ℃).
Description
Technical Field
The invention relates to a high-temperature-resistant high-salt-resistant tackifying and shearing-promoting agent for water-based drilling fluid, and a preparation method and application thereof, and belongs to the technical field of petroleum drilling fluid.
Background
As the global economy continues to increase and the consumption of oil and natural gas increases day by day, the target layer of oil and gas exploration and development gradually extends from the past middle shallow layer to the deep and ultra-deep layer (the buried depth is more than 6000 m). The water-based drilling fluid is a dispersion system consisting of slurrying clay, chemical additives and water, and is of great importance to well wall stability, reservoir protection, mechanical drilling speed improvement and the like in the drilling process. However, the complex geological conditions of high temperature (more than 200 ℃) and high pressure (more than 140 MPa) of a deep reservoir and coexistence of salt-gypsum layers are easy to cause degradation, crosslinking, curling and hydrolysis of polymer additives in the water-based drilling fluid, so that the water-based drilling fluid fails in function, and great challenges are provided for safety, economy and high efficiency of a drilling process.
In recent years, in order to meet the requirements of rapid high-quality drilling of deep wells and ultra-deep wells and reservoir protection, the drilling speed of a machine is improved, the drilling and completion period is shortened, and the soil-free/low-phase polymer water-based drilling fluid which has a protection effect on the reservoir is widely researched and applied. One of the core treating agents of the non/low soil phase polymer water-based drilling fluid is a tackifying and cutting-improving agent which not only has the functions of tackifying and cutting-improving and reducing fluid loss, but also has the function of inhibiting coating. The conventional drilling fluid viscosity-increasing and cutting-improving agent mainly comprises synthetic polymers represented by acrylamide polymers (such as 80A51, FA367 and the like) and biopolymers represented by xanthan gum and carboxymethyl cellulose, but the synthetic polymers and the biopolymers generally fail gradually due to thermal degradation at the temperature of over 150 ℃, so that the water-based drilling fluid of the non/low soil phase polymer cannot meet the drilling requirements of deep wells and ultra-deep wells.
Chinese patent document CN109266318A discloses a preparation method of a high-temperature resistant tackifying and cutting agent for water-based drilling fluid, which adopts starch as a main raw material and has excellent environmental protection performance. Chinese patent CN111171225A discloses a hyper-branched polymer tackifying and cutting agent synthesized by an inverse emulsion polymerization method, which does not need drying and crushing and can reduce the cost and the treatment cost. However, the two tackifying and shearing enhancing agents have the temperature resistance of 150 ℃ and the salt resistance is not evaluated, and the two tackifying and shearing enhancing agents cannot effectively play roles in deep wells and ultra-deep wells along with the exploration and development of deep ultra-deep oil gas resources. Chinese patent document CN107163184A provides a high temperature resistant cutting agent for solid-free drilling fluid, comprising 60-70 parts by weight of solvent water, 15-25 parts by weight of a first monomer, 20-30 parts by weight of a second monomer, 5-7 parts by weight of a cationic monomer, 2-3 parts by weight of a 5wt.% EDTA aqueous solution, 2-3 parts by weight of a 3wt.% reducing agent aqueous solution, 2-3 parts by weight of a 3wt.% oxidizing agent aqueous solution, 1-2 parts by weight of a chain transfer agent, and 0.1-0.2% by weight of ferrous ammonium sulfate based on the total mass of the first monomer, the second monomer and the cationic monomer; wherein the first monomer is 2-acrylamido-2-methylpropanesulfonic acid, sodium methallylsulfonate, sodium p-vinylbenzenesulfonate, sodium 2-acrylamido-2-methylpropanesulfonate or potassium 2-acrylamido-2-methylpropanesulfonate; the second monomer is acrylamide, methacrylamide, N-dimethylacrylamide or N, N-diethylacrylamide; the cationic monomer is methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride or dimethyl diallyl ammonium chloride, but the temperature resistance of the cationic monomer can only reach 170 ℃, and the cationic monomer cannot be suitable for deep ultra-deep strata.
Therefore, how to enhance the stability of the tackifying and cutting-improving agent for the water-based drilling fluid in a high-temperature and high-salt environment and maintain the tackifying and cutting-improving performance has important significance for the basic research of the abundant deep and ultra-deep high-temperature-resistant and high-salt-resistant non/low-soil-phase polymer water-based drilling fluid.
Disclosure of Invention
Aiming at the defects of the prior art, in particular to the problems that the conventional tackifying and cutting agent for the water-based drilling fluid is easy to degrade and crosslink in a high-temperature environment and is easy to curl and agglomerate in a saline water environment, the invention provides a high-temperature-resistant and high-salt-resistant tackifying and cutting agent for the water-based drilling fluid, and a preparation method and application thereof. The tackifying and cutting-improving agent disclosed by the invention can resist high temperature (not less than 200 ℃), resist high salt (saturated salt) and realize the functions of tackifying, improving cutting and reducing filtration loss.
The technical scheme of the invention is as follows:
a preparation method of a high-temperature-resistant high-salt-resistant tackifying shear-promoting agent for water-based drilling fluid comprises the following steps:
(1) Adding isocyano ethyl methacrylate into the 2-amino-4-hydroxy-6-methylpyrimidine solution, and then reacting; after the reaction is finished, the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA) is obtained through filtration, washing and drying;
(2) Dissolving an emulsifier in water, and shearing and emulsifying to obtain emulsion A; adding the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA) obtained in the step (1) into the obtained emulsion A, and shearing and emulsifying to obtain a micelle solution B;
(3) Adding acrylamide monomers, temperature-resistant and salt-resistant monomers, cationic monomers and a cross-linking agent into water, and uniformly stirring to obtain a monomer solution C;
(4) Mixing the micelle emulsion B with the monomer solution C, shearing and emulsifying, and adjusting the pH value of the system to obtain a mixed reaction solution D; introducing nitrogen into the obtained mixed reaction liquid D to remove oxygen, heating to the reaction temperature, adding an initiator, and thermally initiating a free radical polymerization reaction; and after the reaction is finished, cooling to obtain the high-temperature-resistant high-salt-resistant tackifying shear strength improver for the water-based drilling fluid.
Preferably, the 2-amino-4-hydroxy-6-methylpyrimidine solution in step (1) is obtained by dissolving 2-amino-4-hydroxy-6-methylpyrimidine in an organic solvent, wherein the organic solvent is dimethyl sulfoxide or N, N-dimethylformamide; the mass ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to the volume of the organic solvent is 0.1-0.5g, and more preferably 0.2-0.3g; the dissolving temperature of the 2-amino-4-hydroxy-6-methylpyrimidine is 80-150 ℃, and the preferred dissolving temperature is 90-120 ℃.
According to the present invention, the mass ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to the isocyanoethyl methacrylate in step (1) is 1.
Preferably, according to the invention, the temperature of the reaction in step (1) is between 80 and 150 ℃, more preferably between 90 and 120 ℃; the reaction time is 1 to 60min, and more preferably 10 to 30min.
According to the present invention, the washing in step (1) is preferably 2 to 6 times, more preferably 3 to 5 times, using acetone; the drying is vacuum drying at room temperature for 20-30h.
According to the invention, the emulsifier in the step (2) is one or the combination of more than two of Sodium Dodecyl Sulfate (SDS), sodium Dodecyl Benzene Sulfonate (SDBS) and emulsifier OP-10; the ratio of the mass of the emulsifier to the volume of water is 0.05-0.5g.
According to a preferred embodiment of the present invention, the ratio of the mass of the monomer 2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl methacrylate (UPyMA) in step (2) to the volume of water is 0.05 to 0.5g, more preferably 0.1 to 0.2g.
According to the invention, the shear emulsification rate in the step (2) is 500-3000r/min, more preferably 1000-2000r/min; the shearing and emulsifying time is 10-60min.
According to the present invention, it is preferable that the acrylamide-based monomer in step (3) is Acrylamide (AM), N-Dimethylacrylamide (DMAA), isopropylacrylamide (NIPAM); the mass ratio of the acrylamide monomer to the volume of water is 0.1-0.2g.
According to the invention, the temperature-resistant and salt-resistant monomer in the step (3) is 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), sodium Styrene Sulfonate (SSS), sodium Vinyl Sulfonate (VS); the cationic monomer is diallyl dimethyl ammonium chloride (DMDAAC) and acryloyloxyethyl trimethyl ammonium chloride (DAC).
According to the present invention, the mass ratio of the acrylamide-based monomer, the temperature and salt resistant monomer and the cationic monomer in step (3) is 1.
Preferably according to the invention, the crosslinking agent in step (3) is triallylamine or N, N-methylenebisacrylamide; the mass ratio of the cross-linking agent to the total mass of the acrylamide monomer, the temperature and salt resistant monomer and the cationic monomer is 0.01-0.05, and more preferably 0.02-0.03.
According to the present invention, it is preferable that the mass ratio of the monomer 2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl methacrylate (UPyMA) in the micelle emulsion B in the step (4) to the acrylamide-based monomer in the monomer solution C is 1.
According to the invention, the shear emulsification rate in step (4) is preferably 500 to 3000r/min, more preferably 1000 to 2000r/min; the shearing and emulsifying time is 10-60min.
According to the present invention, the pH of the mixed reaction solution D in the step (4) is preferably 3 to 10, more preferably 5 to 9; and (2) using the pH of an alkali solution condition system, wherein the alkali is sodium hydroxide, and the mass fraction of the alkali solution is 10-30%.
Preferably according to the invention, the initiator in step (4) is potassium persulfate (KPS), ammonium Persulfate (APS), azobisisobutyronitrile (AIBN), azobisisobutyramidine hydrochloride (V50); the mass ratio of the initiator to the total mass of the acrylamide monomer, the temperature and salt resistant monomer and the cationic monomer is 0.01-0.05, and more preferably 0.02-0.03.
Preferably, according to the present invention, the reaction temperature in step (4) is 50 to 80 ℃, and more preferably 55 to 70 ℃; the reaction time is 2 to 6 hours, and more preferably 3 to 5 hours.
A high-temperature-resistant high-salt-resistant tackifying and shearing-promoting agent for water-based drilling fluid is prepared by adopting the preparation method.
According to the invention, the high-temperature-resistant high-salt-resistant tackifying and cutting-improving agent for the water-based drilling fluid is applied to the water-based drilling fluid; preferably, the concentration of the high-temperature-resistant and high-salt-resistant viscosity-increasing and cutting-improving agent for the water-based drilling fluid in the water-based drilling fluid is 5-10g/L.
The invention has the following technical characteristics and beneficial effects:
1. the monomer UPyMA capable of forming quadruple hydrogen bonds is introduced into the tackifying and cutting agent, the quadruple hydrogen bonds with larger bonds form stronger physical crosslinking points, the movement capability of polymer chain segments is limited, and a stronger spatial network structure is endowed to the polymer, so that the polymer has excellent tackifying and cutting capabilities.
2. In the invention, a small amount of triallylamine is used as a chemical crosslinking agent in the synthesis process of the polymer to carry out slight and moderate chemical crosslinking on the polymer, thereby improving the temperature resistance of the polymer tackifier.
3. The invention introduces acrylamide monomer which not only can improve the high-temperature hydrolysis resistance of the polymer, but also can increase the molecular weight of the polymer and further enhance the temperature-resistant tackifying capability of the polymer; a temperature-resistant and salt-resistant monomer is introduced, so that the temperature resistance and salt resistance of the polymer can be improved; the cationic monomer is introduced, so that the adsorption capacity of the polymer on the surface of the bentonite is enhanced, the interaction between the polymer and bentonite particles is enhanced, and the gel protection capacity of the polymer is enhanced, so that the dispersion performance of the bentonite particles is maintained, and the tackifier has the filtration loss reduction performance.
4. The polymer tackifier synthesized by the invention has excellent temperature and salt resistance, still has excellent tackifying, cutting improving and fluid loss reducing capabilities after aging at the high temperature of 200 ℃ in a saturated salt environment, and has wide application prospects in the field of high-temperature and high-salinity resistant water-based drilling fluid.
Drawings
FIG. 1 is a one-dimensional nuclear magnetic spectrum of 2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl methacrylate (UPyMA) synthesized in example 5.
FIG. 2 is a thermogravimetric analysis of the synthesized high temperature and high salt resistant viscosified shear strength enhancing agent of example 5.
Detailed Description
The present invention is further illustrated by, but not limited to, the following examples.
Meanwhile, the experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents, materials and equipment are commercially available, unless otherwise specified.
Example 1
A preparation method of a high-temperature-resistant high-salt-resistant tackifying shear-promoting agent for water-based drilling fluid comprises the following steps:
(1) Preparation of monomer 2- (2-ureido-4 [ 2 ] -1H ] -6-methylpyrimidinone) -ethyl ester UPyMA
(1.1) adding 2g of 2-amino-4-hydroxy-6-methylpyrimidine into a 100mL round bottom flask, adding 20mL of dimethyl sulfoxide (DMSO), placing the flask in an oil bath at 100 ℃, and magnetically stirring until the solid is completely dissolved to obtain a dimethyl sulfoxide solution of 2-amino-4-hydroxy-6-methylpyrimidine;
(1.2) adding 2.4g of isocyano ethyl methacrylate into the dimethyl sulfoxide solution of the 2-amino-4-hydroxy-6-methylpyrimidine obtained in the step (1.1) through a constant-pressure dropping funnel, wherein the dropping time is 5min, reacting at 100 ℃ for 15min after the dropping is finished, naturally cooling the reacted product to room temperature, then transferring the cooled product to a suction filtration device with a sand core funnel, carrying out suction filtration to obtain a white solid, washing the white solid with acetone, carrying out suction filtration again, repeating the suction filtration and washing for 3 times, and finally placing the obtained solid in a room-temperature vacuum drying oven for drying for 24h to obtain the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA).
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and cutting-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at the stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1.2) to the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 5g of N, N-Dimethylacrylamide (DMAA), 3g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 2g of diallyldimethylammonium chloride (DMDAAC) and 0.22g of chemical crosslinking agent triallylamine in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing all the micelle emulsion B obtained in the step (2.2) with all the monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH value of the mixed solution to 5 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.22g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the high-temperature-resistant high-salt-resistant tackifying and cutting agent for the water-based drilling fluid.
Example 2
A preparation method of a high-temperature-resistant high-salt-resistant tackifying and cutting-improving agent for a water-based drilling fluid comprises the following steps:
(1) Preparation of monomeric methacrylic acid 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA
(1.1) adding 2g of 2-amino-4-hydroxy-6-methylpyrimidine into a 100mL round-bottom flask, adding 20mL of dimethyl sulfoxide (DMSO), placing the flask in an oil bath kettle at 100 ℃, and magnetically stirring until the solid is completely dissolved to obtain a dimethyl sulfoxide solution of 2-amino-4-hydroxy-6-methylpyrimidine;
(1.2) adding 2.4g of isocyano ethyl methacrylate into the dimethyl sulfoxide solution of the 2-amino-4-hydroxy-6-methylpyrimidine obtained in the step (1.1) through a constant-pressure dropping funnel, wherein the dropping time is 5min, reacting at 100 ℃ for 15min after the dropping is finished, naturally cooling the reacted product to room temperature, then transferring the cooled product to a suction filtration device with a sand core funnel, carrying out suction filtration to obtain a white solid, washing the white solid with acetone, carrying out suction filtration again, repeating the suction filtration and washing for 3 times, and finally placing the obtained solid in a room-temperature vacuum drying oven for drying for 24h to obtain the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA).
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and shear-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at the stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1.2) to the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 5g of N, N-Dimethylacrylamide (DMAA), 3g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 2g of diallyldimethylammonium chloride (DMDAAC) and 0.22g of chemical crosslinking agent triallylamine in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing the whole micelle emulsion B obtained in the step (2.2) with the whole monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH of the mixed solution to 7 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.22g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the high-temperature-resistant high-salt-resistant tackifying and cutting agent for the water-based drilling fluid.
Example 3
A preparation method of a high-temperature-resistant high-salt-resistant tackifying and cutting-improving agent for a water-based drilling fluid comprises the following steps:
(1) Preparation of monomeric methacrylic acid 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA
(1.1) adding 2g of 2-amino-4-hydroxy-6-methylpyrimidine into a 100mL round bottom flask, adding 20mL of dimethyl sulfoxide (DMSO), placing the flask in an oil bath at 100 ℃, and magnetically stirring until the solid is completely dissolved to obtain a dimethyl sulfoxide solution of 2-amino-4-hydroxy-6-methylpyrimidine;
(1.2) adding 2.4g of isocyano ethyl methacrylate into the dimethyl sulfoxide solution of the 2-amino-4-hydroxy-6-methylpyrimidine obtained in the step (1.1) through a constant-pressure dropping funnel, wherein the dropping time is 5min, reacting at 100 ℃ for 15min after the dropping is finished, naturally cooling the reacted product to room temperature, then transferring the cooled product to a suction filtration device with a sand core funnel, carrying out suction filtration to obtain a white solid, washing the white solid with acetone, carrying out suction filtration again, repeating the suction filtration and washing for 3 times, and finally placing the obtained solid in a room-temperature vacuum drying oven for drying for 24h to obtain the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA).
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and cutting-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at the stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1.2) to the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 5g of N, N-Dimethylacrylamide (DMAA), 3g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 2g of diallyldimethylammonium chloride (DMDAAC) and 0.22g of chemical crosslinking agent triallylamine in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing all the micelle emulsion B obtained in the step (2.2) with all the monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and then adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.22g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the high-temperature-resistant high-salt-resistant tackifying and cutting agent for the water-based drilling fluid.
Example 4
A preparation method of a high-temperature-resistant high-salt-resistant tackifying shear-promoting agent for water-based drilling fluid comprises the following steps:
(1) Preparation of monomeric methacrylic acid 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA
(1.1) adding 2g of 2-amino-4-hydroxy-6-methylpyrimidine into a 100mL round-bottom flask, adding 20mL of dimethyl sulfoxide (DMSO), placing the flask in an oil bath kettle at 100 ℃, and magnetically stirring until the solid is completely dissolved to obtain a dimethyl sulfoxide solution of 2-amino-4-hydroxy-6-methylpyrimidine;
(1.2) adding 2.4g of isocyano ethyl methacrylate into the dimethyl sulfoxide solution of the 2-amino-4-hydroxy-6-methylpyrimidine obtained in the step (1.1) through a constant-pressure dropping funnel, wherein the dropping time is 5min, reacting at 100 ℃ for 15min after the dropping is finished, naturally cooling the reacted product to room temperature, then transferring the cooled product to a suction filtration device with a sand core funnel, carrying out suction filtration to obtain a white solid, washing the white solid with acetone, carrying out suction filtration again, repeating the suction filtration and washing for 3 times, and finally placing the obtained solid in a room-temperature vacuum drying oven for drying for 24h to obtain the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA).
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and cutting-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at the stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1.2) to the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 5g of N, N-Dimethylacrylamide (DMAA), 8g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 3g of diallyldimethylammonium chloride (DMDAAC), and 0.34g of chemical crosslinking agent triallylamine in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing all the micelle emulsion B obtained in the step (2.2) with all the monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and then adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.34g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the high-temperature-resistant high-salt-resistant tackifying and cutting agent for the water-based drilling fluid.
Example 5
A preparation method of a high-temperature-resistant high-salt-resistant tackifying shear-promoting agent for water-based drilling fluid comprises the following steps:
(1) Preparation of monomeric methacrylic acid 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA
(1.1) adding 2g of 2-amino-4-hydroxy-6-methylpyrimidine into a 100mL round-bottom flask, adding 20mL of dimethyl sulfoxide (DMSO), placing the flask in an oil bath kettle at 100 ℃, and magnetically stirring until the solid is completely dissolved to obtain a dimethyl sulfoxide solution of 2-amino-4-hydroxy-6-methylpyrimidine;
(1.2) adding 2.4g of isocyano ethyl methacrylate into the dimethyl sulfoxide solution of the 2-amino-4-hydroxy-6-methylpyrimidine obtained in the step (1.1) through a constant-pressure dropping funnel, wherein the dropping time is 5min, reacting at 100 ℃ for 15min after the dropping is finished, naturally cooling the reacted product to room temperature, then transferring the cooled product to a suction filtration device with a sand core funnel, carrying out suction filtration to obtain a white solid, washing the white solid with acetone, carrying out suction filtration again, repeating the suction filtration and washing for 3 times, and finally placing the obtained solid in a room-temperature vacuum drying oven for drying for 24h to obtain the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA).
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and cutting-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at the stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1.2) to the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 6g of N, N-Dimethylacrylamide (DMAA), 7g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 3g of diallyldimethylammonium chloride (DMDAAC) and 0.34g of chemical crosslinking agent triallylamine in 30mL of water, and sufficiently stirring to obtain a monomer solution C;
(2.4) mixing the whole micelle emulsion B obtained in the step (2.2) with the whole monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.34g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the high-temperature-resistant high-salt-resistant tackifying and cutting agent for the water-based drilling fluid.
The one-dimensional nuclear magnetic hydrogen spectrum of the monomer 2- (2-ureido-4 [ 2 ], [1H ] -6-methylpyrimidinone) -ethyl methacrylate (UPyMA) obtained in this example is shown in FIG. 1.
The thermogravimetric analysis diagram of the high-temperature-resistant and high-salt-resistant tackifying and cutting-promoting agent for the water-based drilling fluid obtained in the embodiment is shown in fig. 2, and it can be seen from fig. 2 that a small amount of weight loss of the tackifier occurs before 130 ℃, which is mainly caused by volatilization of a small amount of water molecules in a sample; between 130 ℃ and 270 ℃, the bound water absorbed by strong hydrophilic groups such as amide groups, sulfonic acid groups and the like in the molecular sample begins to volatilize by heating; the thermogravimetric curve drops sharply from 270 ℃ to 360 ℃, and the process is that amide groups in the molecular structure begin to decompose and volatilize; at 360 ℃ to 430 ℃, the sulfonic acid groups in the copolymer molecules begin to decompose rapidly, and the main chain and side chains of the copolymer molecules begin to break. The above shows that the thermal stability of the tackifying and shear enhancing agent is better.
The synthetic route of this example is as follows:
example 6
A preparation method of a high-temperature-resistant high-salt-resistant tackifying and cutting-improving agent for a water-based drilling fluid comprises the following steps:
(1) Preparation of monomeric methacrylic acid 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA
(1.1) adding 2g of 2-amino-4-hydroxy-6-methylpyrimidine into a 100mL round-bottom flask, adding 20mL of dimethyl sulfoxide (DMSO), placing the flask in an oil bath kettle at 100 ℃, and magnetically stirring until the solid is completely dissolved to obtain a dimethyl sulfoxide solution of 2-amino-4-hydroxy-6-methylpyrimidine;
(1.2) adding 2.4g of isocyano ethyl methacrylate into the dimethyl sulfoxide solution of the 2-amino-4-hydroxy-6-methylpyrimidine obtained in the step (1.1) through a constant-pressure dropping funnel, wherein the dropping time is 5min, reacting at 100 ℃ for 15min after the dropping is finished, naturally cooling the reacted product to room temperature, then transferring the cooled product to a suction filtration device with a sand core funnel, carrying out suction filtration to obtain a white solid, washing the white solid with acetone, carrying out suction filtration again, repeating the suction filtration and washing for 3 times, and finally placing the obtained solid in a room-temperature vacuum drying oven for drying for 24h to obtain the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester (UPyMA).
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and shear-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1.2) to the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 8g of N, N-Dimethylacrylamide (DMAA), 8g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 4g of diallyldimethylammonium chloride (DMDAAC), and 0.42g of triallylamine, which is a chemical crosslinking agent, in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing the whole micelle emulsion B obtained in the step (2.2) with the whole monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.42g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the high-temperature-resistant high-salt-resistant tackifying and cutting agent for the water-based drilling fluid.
Comparative example 1
A preparation method of a tackifying and shear strength improving agent for a water-based drilling fluid comprises the following steps:
(1) Dissolving 6g of N, N-Dimethylacrylamide (DMAA), 7g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 3g of diallyldimethylammonium chloride (DMDAAC) and 0.34g of chemical cross-linking agent triallylamine in 230mL of water, and adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution A;
(2) And (3) fully deoxidizing the mixed reaction liquid A in a nitrogen atmosphere, heating to 55 ℃, adding 0.34g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the tackifying and shearing-promoting agent for the water-based drilling fluid.
The adhesion promoting and cutting agent of this comparative example did not contain a 2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl methacrylate (UPyMA) monomer capable of forming quadruple hydrogen bonds.
Comparative example 2
A viscosifying shear-enhancing agent for water-based drilling fluids is prepared as described in example 5, except that: in step (2.3), no triallylamine crosslinker was added, and the other conditions were the same as in example 5.
Comparative example 3
A preparation method of a tackifying and shearing-improving agent for water-based drilling fluid comprises the following steps:
(1) The monomer 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA was prepared as in example 5.
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and cutting-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of the monomeric methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA obtained in the step (1) into the emulsion A obtained in the step (2.1), and shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine to obtain a micellar solution B;
(2.3) dissolving 7g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 3g of diallyldimethylammonium chloride (DMDAAC) and 0.22g of chemical cross-linking agent triallylamine in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing the whole micelle emulsion B obtained in the step (2.2) with the whole monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.22g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the tackifying and cutting agent for the water-based drilling fluid.
The adhesion promoting and cutting agent of the comparative example does not contain acrylamide monomers.
Comparative example 4
A preparation method of a tackifying and shearing-improving agent for water-based drilling fluid comprises the following steps:
(1) The monomer 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl methacrylate UPyMA was prepared in the same manner as in example 5.
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and cutting-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at the stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of monomeric 2- (2-ureido-4 2 [1H ] -6-methylpyrimidinone) -ethyl methacrylate UPyMA obtained in the step (1) into the emulsion A obtained in the step (2.1), and carrying out shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifying machine to obtain a micellar solution B;
(2.3) dissolving 6g of N, N-Dimethylacrylamide (DMAA), 3g of diallyldimethylammonium chloride (DMDAAC) and 0.2g of chemical cross-linking agent triallylamine in 30mL of water, and fully stirring to obtain a monomer solution C;
(2.4) mixing the whole micelle emulsion B obtained in the step (2.2) with the whole monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.2g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the tackifying and cutting agent for the water-based drilling fluid.
The temperature-resistant and salt-resistant monomer is not added into the tackifying and cutting agent of the comparative example.
Comparative example 5
A preparation method of a tackifying and shear strength improving agent for a water-based drilling fluid comprises the following steps:
(1) The monomer 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl methacrylate UPyMA was prepared in the same manner as in example 5.
(2) Preparation of temperature-resistant salt-resistant polymer tackifying and shear-improving agent
(2.1) adding 1g of emulsifier sodium dodecyl sulfate and 200mL of distilled water into a 250mL beaker, and shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine to prepare emulsion A;
(2.2) adding 1g of 2- (2-ureido-4 ], [1H ] -6-methylpyrimidinone) -ethyl methacrylate UPyMA obtained in the step (1) to the emulsion A obtained in the step (2.1), and performing shear emulsification for 30min at a stirring speed of 1000r/min by using a shear emulsifier to obtain a micellar solution B;
(2.3) dissolving 6g of N, N-Dimethylacrylamide (DMAA), 7g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), and 0.28g of chemical crosslinking agent triallylamine in 30mL of water, and sufficiently stirring the solution to obtain a monomer solution C;
(2.4) mixing the whole micelle emulsion B obtained in the step (2.2) with the whole monomer solution C obtained in the step (2.3), shearing and emulsifying for 30min at a stirring speed of 1000r/min by using a shearing and emulsifying machine, and adjusting the pH of the mixed solution to 9 by using a NaOH aqueous solution with the mass fraction of 20% to obtain a mixed reaction solution D;
and (2.5) fully deoxidizing the mixed reaction liquid D in a nitrogen atmosphere, heating to 55 ℃, adding 0.28g of initiator potassium persulfate (KPS), carrying out polymerization reaction for 4 hours at 55 ℃, and naturally cooling to room temperature after the reaction is finished to obtain the tackifying and cutting agent for the water-based drilling fluid.
The tackifying and shear strength increasing agent of this comparative example did not contain a cationic monomer.
Comparative example 6
Tackifier 80a51 was purchased commercially.
Comparative example 7
A viscosifying shear strength agent for water-based drilling fluids was prepared as described in example 5, except that: the crosslinking agent triallylamine added in step (2.3) was replaced with N, N-dimethylacrylamide, and the other conditions were the same as in example 5.
Comparative example 8
A viscosifying shear strength agent for water-based drilling fluids was prepared as described in example 5, except that: the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA added in the step (2.2) was adjusted to 0.5g, and the other conditions were the same as in example 5.
In this comparative example, the ratio of the monomer 2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl methacrylate UPyMA to the acrylamide-based monomer was too low.
Comparative example 9
A viscosifying shear strength agent for water-based drilling fluids was prepared as described in example 5, except that: the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester UPyMA added in the step (2.2) was adjusted to 2g, and the other conditions were the same as in example 5.
In this comparative example, the ratio of the monomer methacrylic acid-2- (2-ureido-4 [ 2 ] 1H ] -6-methylpyrimidinone) -ethyl ester UPyMA to the acrylamide-based monomer was too high.
1. Viscosity average molecular weight measurement of thickening and cutting agent
According to the national standard GBT 12005.10-1992 polyacrylamide molecular weight determination viscosity method, the flow-through time of a solvent (1.0 mol/L NaCl solution) and a solution is respectively measured at 30 ℃ by a full-automatic capillary viscometer, and the characteristic viscosity [ eta ] of a tackifying and shear-promoting agent is calculated by combining a Huggins formula and a Kraemer formula]And using empirical formula M eta = (10000 [ eta ] =)]/3.73) 1.515 And calculating the viscosity average molecular weight M eta of the viscosity increasing and cutting agent.
2. Effect of tackifiers on rheology and fluid loss Properties of base slurries before and after aging
(1) Preparation of 4wt% bentonite-based slurry: adding 16g of bentonite and 0.56g of anhydrous sodium carbonate into 400g of water, fully stirring at 8000rpm at room temperature for 2h, and sealing, standing and hydrating at room temperature for 24h;
(2) preparing a drilling fluid sample: 400mL of 4% bentonite-based slurry was taken, 2g (0.5%) of each of the samples of examples 1-6 and comparative examples 1-8 was added thereto, and the mixture was stirred at 6000r/min at room temperature for 20min;
(3) preparing a brine drilling fluid sample: 400mL of 4% bentonite-based slurry was added to 2g (0.5%) of each of the samples of examples 1-6 and comparative examples 1-8, and the mixture was stirred at 6000r/min at room temperature for 20min; subsequently, 144g (36%) of sodium chloride is added and stirred for 20min at the rotation speed of 4000r/min at room temperature;
(4) aging treatment of a drilling fluid sample: and (3) placing the drilling fluid sample in a roller heating furnace, setting the aging temperature to be 200 ℃ and the aging time to be 16h.
(5) Referring to GB16783.1-2014 oil and gas industry drilling fluid field test first part: water-based drilling fluid, and the rheological and fluid loss properties of the prepared solution are evaluated.
3. Results of Performance testing
TABLE 1 viscosity average molecular weight of tackifying and shear-promoting agents
Table 1 reports the viscosity average molecular weights of the samples of examples 1-6 and comparative examples 1-8: it can be seen that the samples prepared in examples 1-6 in example 5 have a larger viscosity average molecular weight; comparative example 1 the molecular weight of the tackifying and shear-promoting agent is the largest due to the aqueous solution free radical polymerization because no quadruple hydrogen bond monomer UPyMA is introduced; comparative example 2 no triallylamine chemical crosslinker was introduced, the molecular weight of the adhesion promoting and shear enhancing agent was also greater; comparative examples 3, 4, and 5, which correspond to the absence of DMAA, AMPS, and DMDAAC monomers, respectively, it can be seen that the absence of DMAA monomer results in a decrease in the molecular weight of the adhesion promoting elevator because DMAA monomer is easily polymerized and increases the molecular weight of the polymer, while the absence of DMDAAC monomer results in an increase in the molecular weight of the adhesion promoting elevator because DMDAAC monomer is a cyclic monomer and is easily inhibited from polymerization; comparative example 6 is a commercial tackifier 80A51, which has a relatively large viscosity average molecular weight. The crosslinking agent in comparative example 7 was changed to N, N-dimethylacrylamide, and the influence on the molecular weight was not large; in the comparative example 8, the amount of the quadruple hydrogen bond monomer UPyMA is reduced, and the molecular weight of the tackifying and shearing-improving agent is increased; in the comparative example 9, the addition amount of the quadruple hydrogen bond monomer UPyMA is increased, and the molecular weight of the tackifying and shearing-improving agent is reduced.
TABLE 2 rheological Properties and fluid loss Properties data sheet of drilling fluid obtained by adding the tackifying and shear-enhancing agent prepared in the example
From the test results in table 2, it can be seen that the Apparent Viscosity (AV), the Plastic Viscosity (PV) and the dynamic shear force (YP) of the drilling fluid are significantly improved after the tackifying and shear-improving agents prepared in examples 1 to 6 are added, compared with the base slurry, and the tackifying and shear-improving performance of the examples can be maintained even after aging at 200 ℃. After the tackifying and shear-improving agent in the embodiment 5 is added, the viscosity and the shear force of a drilling fluid sample are maximum, the filtration loss is minimum, and the performance is most excellent.
TABLE 3 rheological Properties and fluid loss Properties data sheet of drilling fluids obtained by adding the viscosity increasing and shear strength increasing agent prepared in the comparative example
As can be seen from table 3: comparative example 1 has a larger molecular weight, smaller rheological parameters after aging and a larger fluid loss because of not containing quadruple hydrogen bond UPyMA monomer, which is caused by lower strength of the polymer grid structure; comparative example 2 does not contain triallylamine, which is a chemical crosslinking agent, and the chain segment motion capability is not limited at high temperature, so that the temperature resistance is poor; comparative example 3 has relatively low molecular weight and relatively poor tackifying performance because of no DMAA monomer; comparative example 4 because no AMPS monomer was contained, the temperature resistance was poor, and there was not sufficient hydration ability, the fluid loss was increased; comparative example 5 because the DMDAAC monomer is not contained, after the tackifying and shearing-promoting agent is added, the tackifying and shearing-promoting agent cannot form stronger interaction with bentonite, the adhesive protecting capability is weak, and the filtration loss is maximum; comparative example 6 is a commercially available tackifier 80A51, and the tackifying and shear-improving properties after aging are relatively weak, and the temperature resistance is poor. The cross-linking agent of comparative example 7 is a cross-linking agent with two degrees of functionality, the grid structure of the tackifying and shearing-promoting agent is weak, the tackifying and shearing-promoting performance after aging is relatively weak, and the temperature resistance is poor. The addition of quadruple hydrogen bond monomers is reduced in the comparative example 8, the grid structure of the tackifying and shearing-promoting agent is weak, and the tackifying, shearing-promoting and temperature-resisting performance is poor. Comparative example 9 the amount of the quadruple hydrogen bond monomer is increased, the molecular weight of the tackifying and shearing-promoting agent is reduced, and the tackifying, shearing-promoting and temperature-resisting properties are poor.
TABLE 4 data sheet for rheological and fluid loss properties of saturated salt drilling fluids incorporating viscosifying shear-enhancing agents prepared in examples
As can be seen from the test results in table 4, after the base slurry is invaded by the salt, the metallic sodium ions weaken the electrostatic repulsive force between the bentonite particles, compress the double diffusion layers between the bentonite particles, cause aggregation of the bentonite particles, deteriorate the slurry-making property, and sharply increase the fluid loss. After the tackifying and cutting-improving agent prepared in the examples 1 to 6 is added, the rheological parameters of the drilling fluid aged at 200 ℃ are improved to a certain extent, the fluid loss is reduced relative to the base slurry, and the tackifying and cutting-improving performance of the examples can be maintained even after the drilling fluid is aged at 200 ℃, so that the prepared tackifying and cutting-improving agent has excellent high-temperature resistance. The drilling fluid sample added with the tackifying and cutting agent in the embodiment 5 has the smallest filtration loss, the filtration loss at normal temperature is 15mL before aging, the filtration loss at normal temperature is 28mL after aging, and the performance is the most excellent.
TABLE 5 rheological Properties and fluid loss Properties data sheet of saturated salt drilling fluid obtained by adding viscosity-increasing and shear-improving agent prepared in comparative example
As can be seen from table 5: the tackifying and shearing-promoting agent prepared in the comparative example 1 does not contain quadruple hydrogen bond UPyMA monomers, so that the polymer grid structure has low strength, poor temperature resistance and salt resistance, poor rheological control performance and large filtration loss; the tackifying and cutting agent prepared in the comparative example 2 does not contain chemical cross-linking agent triallylamine, so that the linear polymer has stronger chain segment motion capability at high temperature, and the degradation and curling of the polymer in a high-temperature and high-salt environment are accelerated to a certain extent, so that the high-temperature and high-salt resistance of the polymer is weaker; comparative example 3 has a relatively low molecular weight and relatively poor tackifying performance in a saline environment because of the absence of DMAA monomer; comparative example 4 contains no AMPS monomer, has poor temperature resistance and salt tolerance, and has enough salt hydration resistant groups in polymer molecules, so that the rheological property and the filtrate loss reduction property are poor; comparative example 5 because of not containing DMDAAC monomer, the temperature resistance of the tackifying and cutting agent is poor, the polymer does not have enough adsorption groups, the rubber protecting capability in saline environment is weakened, and the filtration loss is increased; comparative example 6 is a commercially available tackifier 80a51, which has relatively poor tackifying and shear-improving properties and fluid loss reduction properties in a high-temperature and high-salt environment. The cross-linking agent of comparative example 7 is a cross-linking agent with two degrees of functionality, the grid structure of the tackifying and shearing-promoting agent is weak, and the tackifying and shearing-promoting performance in a high-temperature and high-salt environment is relatively poor. The addition of quadruple hydrogen bond monomers is reduced in the comparative example 8, the grid structure of the tackifying and shearing-promoting agent is weak, and the tackifying, shearing-promoting, temperature-resisting and salt-resisting properties are poor. Comparative example 9 the amount of the quadruple hydrogen bond monomer added is increased, the molecular weight of the tackifying and shear-enhancing agent is reduced, and the tackifying, shear-enhancing, temperature-resistant and salt-resistant performances are deteriorated.
In conclusion, the tackifying and cutting-improving agent prepared by the invention still has excellent tackifying, cutting-improving and filtrate loss reducing performances after being aged in a high-temperature (200 ℃) high-salt (saturated salt) environment, and can enrich the development of a high-temperature-resistant high-salt water-based drilling fluid technology.
Claims (10)
1. A preparation method of a high-temperature-resistant high-salt-resistant tackifying shear-promoting agent for water-based drilling fluid comprises the following steps:
(1) Adding isocyano ethyl methacrylate into the 2-amino-4-hydroxy-6-methylpyrimidine solution, and then reacting; after the reaction is finished, filtering, washing and drying to obtain monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester;
(2) Dissolving an emulsifier in water, and shearing and emulsifying to obtain emulsion A; adding the monomer methacrylic acid-2- (2-ureido-4 [1H ] -6-methylpyrimidinone) -ethyl ester obtained in the step (1) into the obtained emulsion A, and shearing and emulsifying to obtain a micelle solution B;
(3) Adding acrylamide monomers, temperature-resistant and salt-resistant monomers, cationic monomers and a cross-linking agent into water, and uniformly stirring to obtain a monomer solution C;
(4) Mixing the micelle emulsion B with the monomer solution C, shearing and emulsifying, and adjusting the pH value of the system to obtain a mixed reaction solution D; introducing nitrogen into the obtained mixed reaction liquid D to remove oxygen, heating to the reaction temperature, adding an initiator, and thermally initiating a free radical polymerization reaction; and after the reaction is finished, cooling to obtain the high-temperature-resistant high-salt-resistant tackifying shear strength improver for the water-based drilling fluid.
2. The preparation method of the high temperature resistant, high salt resistant, viscosity increasing and cutting agent for the water-based drilling fluid according to claim 1, wherein the 2-amino-4-hydroxy-6-methylpyrimidine solution in the step (1) is obtained by dissolving 2-amino-4-hydroxy-6-methylpyrimidine in an organic solvent, and the organic solvent is dimethyl sulfoxide or N, N-dimethylformamide; the mass ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to the volume of the organic solvent is 0.1-0.5g, preferably 0.2-0.3g; the dissolving temperature of the 2-amino-4-hydroxy-6-methylpyrimidine is 80-150 ℃, preferably 90-120 ℃.
3. The preparation method of the high-temperature-resistant high-salt-resistant tackifying and cutting-promoting agent for the water-based drilling fluid according to claim 1 is characterized in that the mass ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to the isocyanoethyl methacrylate in the step (1) is 1-1.5, preferably 1.2-1.4;
the reaction temperature is 80-150 ℃, preferably 90-120 ℃; the reaction time is 1-60min, preferably 10-30min;
the washing is 2 to 6 times, preferably 3 to 5 times by using acetone; the drying is vacuum drying at room temperature for 20-30h.
4. The preparation method of the high temperature and high salt resistant viscosity-increasing and cutting-improving agent for the water-based drilling fluid according to claim 1, wherein the emulsifier in the step (2) is one or a combination of more than two of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and emulsifier OP-10; the mass ratio of the emulsifier to the volume of water is 0.05-0.5g; the volume ratio of the monomer 2- (2-ureido-4, [1H ] -6-methylpyrimidinone) -ethyl methacrylate to water is 0.05-0.5g (20 mL), preferably 0.1-0.2g (20 mL);
the shearing and emulsifying speed is 500-3000r/min, preferably 1000-2000r/min; the time for shearing and emulsifying is 10-60min.
5. The preparation method of the high temperature and high salt resistant viscosity increasing and cutting agent for the water-based drilling fluid according to claim 1, wherein the acrylamide monomer in the step (3) is acrylamide, N-dimethylacrylamide or isopropylacrylamide; the mass ratio of the acrylamide monomer to the volume of water is 0.1-0.2g;
the temperature-resistant and salt-resistant monomer is 2-acrylamide-2-methylpropanesulfonic acid, sodium styrene sulfonate and sodium vinyl sulfonate; the cationic monomer is diallyl dimethyl ammonium chloride or acryloyloxyethyl trimethyl ammonium chloride.
6. The preparation method of the high temperature and high salt resistant tackifying and shearing agent for the water-based drilling fluid according to claim 1 is characterized in that the mass ratio of the acrylamide monomer, the temperature and salt resistant monomer and the cationic monomer in the step (3) is 1;
the cross-linking agent is triallylamine or N, N-methylene-bisacrylamide; the mass ratio of the cross-linking agent to the total mass of the acrylamide monomer, the temperature-resistant and salt-resistant monomer and the cationic monomer is 0.01-0.05, preferably 0.02-0.03.
7. The preparation method of the high temperature and high salt resistant tackifying and cutting agent for the water-based drilling fluid according to claim 1, wherein the mass ratio of the monomer 2- (2-ureido-4 ], [1H ] -6-methylpyrimidinone) -ethyl methacrylate in the micelle emulsion B to the acrylamide monomer in the monomer solution C in step (4) is 1 to 5;
the speed of the shearing emulsification is 500-3000r/min, preferably 1000-2000r/min; the shearing and emulsifying time is 10-60min;
the pH value of the mixed reaction solution D is 3-10, preferably 5-9; and (2) using the pH of an alkali solution condition system, wherein the alkali is sodium hydroxide, and the mass fraction of the alkali solution is 10-30%.
8. The preparation method of the high-temperature-resistant high-salt-resistant viscosity-increasing and cutting-improving agent for the water-based drilling fluid according to claim 1, wherein the initiator in the step (4) is potassium persulfate, ammonium persulfate, azobisisobutyronitrile, azobisisobutyramidine hydrochloride; the mass ratio of the initiator to the total mass of the acrylamide monomer, the temperature and salt resistant monomer and the cationic monomer is 0.01-0.05, preferably 0.02-0.03;
the reaction temperature is 50-80 ℃, and is preferably 55-70 ℃; the reaction time is 2-6h, preferably 3-5h.
9. A high-temperature-resistant high-salt-resistant tackifying and cutting-improving agent for water-based drilling fluid, which is characterized by being prepared by the preparation method of any one of claims 1 to 8.
10. The application of the high temperature resistant and high salt resistant viscosity-increasing and cutting-improving agent for the water-based drilling fluid in the water-based drilling fluid of claim 9; preferably, the concentration of the high-temperature-resistant and high-salt-resistant viscosity-increasing and cutting-improving agent for the water-based drilling fluid in the water-based drilling fluid is 5-10g/L.
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| CN116478330A (en) * | 2023-05-05 | 2023-07-25 | 成都顺达利聚合物有限公司 | Tackifying and cutting polymer for high-temperature brine-based low-solid-phase drilling/completion fluid, and preparation method and application thereof |
| CN116693743A (en) * | 2023-08-07 | 2023-09-05 | 中海油田服务股份有限公司 | Crosslinking acrylic ester polymer tackifying and cutting agent, and preparation method and application thereof |
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| CN113583191A (en) * | 2021-07-15 | 2021-11-02 | 中国石油大学(华东) | Environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid and preparation method and application thereof |
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| CN116478330A (en) * | 2023-05-05 | 2023-07-25 | 成都顺达利聚合物有限公司 | Tackifying and cutting polymer for high-temperature brine-based low-solid-phase drilling/completion fluid, and preparation method and application thereof |
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| CN116693743A (en) * | 2023-08-07 | 2023-09-05 | 中海油田服务股份有限公司 | Crosslinking acrylic ester polymer tackifying and cutting agent, and preparation method and application thereof |
| CN116693743B (en) * | 2023-08-07 | 2023-10-20 | 中海油田服务股份有限公司 | Crosslinking acrylic ester polymer tackifying and cutting agent, and preparation method and application thereof |
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