CN115353585B - Preparation method of polyacrylamide potassium salt coating inhibitor for drilling fluid - Google Patents
Preparation method of polyacrylamide potassium salt coating inhibitor for drilling fluid Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 55
- 238000000576 coating method Methods 0.000 title claims abstract description 55
- 239000003112 inhibitor Substances 0.000 title claims abstract description 54
- 229920002401 polyacrylamide Polymers 0.000 title claims abstract description 43
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 title claims abstract description 43
- 238000005553 drilling Methods 0.000 title claims abstract description 39
- 239000012530 fluid Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000007062 hydrolysis Effects 0.000 claims abstract description 16
- 239000000376 reactant Substances 0.000 claims abstract description 15
- 239000007864 aqueous solution Substances 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims abstract description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004202 carbamide Substances 0.000 claims abstract description 11
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims abstract description 10
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims abstract description 10
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 7
- 239000012966 redox initiator Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical group [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 22
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 14
- 235000015497 potassium bicarbonate Nutrition 0.000 claims description 12
- 239000011736 potassium bicarbonate Substances 0.000 claims description 12
- 229910000028 potassium bicarbonate Inorganic materials 0.000 claims description 12
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 12
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 11
- 235000011181 potassium carbonates Nutrition 0.000 claims description 11
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 7
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 7
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 5
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 230000005764 inhibitory process Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 abstract description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 21
- 239000000243 solution Substances 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- VAPQAGMSICPBKJ-UHFFFAOYSA-N 2-nitroacridine Chemical compound C1=CC=CC2=CC3=CC([N+](=O)[O-])=CC=C3N=C21 VAPQAGMSICPBKJ-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000007334 copolymerization reaction Methods 0.000 description 4
- 210000003298 dental enamel Anatomy 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
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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
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/24—Homopolymers or copolymers of amides or imides
- C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention belongs to the technical field of oilfield drilling fluid treatment agents, and particularly relates to a preparation method of a polyacrylamide potassium salt coating inhibitor for drilling fluid. The preparation method provided by the invention comprises the following steps: (1) Uniformly stirring and mixing an aqueous solution of an acrylamide monomer, a hydrolysis agent, disodium ethylenediamine tetraacetate and urea, then adding a redox initiator under the protection of nitrogen at a set temperature of 20-40 ℃ for stirring reaction, stopping stirring when the temperature of a reaction system is higher than the set temperature by 2-3 ℃, transferring the obtained reactant, and continuing to react for 5-7 hours to obtain a spongy product; (2) Crushing, drying and crushing the spongy product. The invention adopts a simple hydrolytic polymerization method, thereby achieving the purposes of comprehensively regulating and controlling the molecular weight, the inhibition effect and the water solubility of the product and greatly meeting the industry requirements of polyacrylamide potassium salt coating inhibitors for drilling fluid.
Description
Technical Field
The invention belongs to the technical field of oilfield drilling fluid treatment agents, and particularly relates to a preparation method of a polyacrylamide potassium salt coating inhibitor for drilling fluid.
Background
With the continuous and deep development of domestic oil and gas reservoirs, higher requirements are also put forward on the quality of drilling fluid treatment agents. The coating inhibitor for the drilling fluid is one of more important treating agents in the use process of the drilling fluid, and has the functions of coating rock debris, inhibiting shale and clay expansion and stabilizing the well wall.
The polyacrylamide potassium salt coating inhibitor is a mature inhibitor for drilling fluid at present, and is widely applied to the drilling fluid at present. The existing preparation method of the polyacrylamide potassium salt coating inhibitor generally adopts a copolymerization method of acrylamide and potassium acrylate, specifically comprises the steps of firstly dissolving potassium hydroxide into a solution, then neutralizing with acrylic acid to generate a potassium acrylate solution, then adding solid acrylamide to dissolve uniformly, and then adding a redox initiator to perform polymerization reaction to obtain the polyacrylamide potassium salt coating inhibitor. However, the polyacrylamide potassium salt product obtained by the method has the problems of low molecular weight, relatively poor coating inhibition capability, easy agglomeration and poor solubility, and further application of the polyacrylamide potassium salt product in drilling fluid is limited.
Disclosure of Invention
In view of the above, the present invention has an object to provide a method for producing a polyacrylamide potassium salt coating inhibitor for drilling fluids, which can obtain a coating inhibitor having a high molecular weight, excellent inhibitory ability and excellent water solubility by a simple hydrolysis polymerization method.
In order to achieve the aim of the invention, the preparation method of the polyacrylamide potassium salt coating inhibitor for drilling fluid provided by the invention comprises the following steps:
(1) Uniformly stirring and mixing an aqueous solution of an acrylamide monomer, a hydrolysis agent, disodium ethylenediamine tetraacetate and urea, then adding a redox initiator under the protection of nitrogen at a set temperature of 20-40 ℃ for stirring reaction, stopping stirring when the temperature of a reaction system is higher than the set temperature by 2-3 ℃, transferring the obtained reactant, and standing for reaction for 5-7 hours to obtain a spongy product;
(2) Crushing, drying and crushing the spongy product to obtain a polyacrylamide potassium salt coating inhibitor for drilling fluid;
wherein, in the aqueous solution of the acrylamide monomer, the mass concentration of the acrylamide monomer is 30-40%; the hydrolytic agent is potassium carbonate and potassium bicarbonate with the mass ratio of 1: a mixture of (2-3); the dosage of the hydrolytic agent is 35 to 40 percent of the mass of the acrylamide monomer.
According to the preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid, the monomer solution, the hydrolytic agent, the disodium ethylenediamine tetraacetate and the urea are used as a composite system to prepare the polyacrylamide potassium salt, under the combined action of the initiator and the hydrolytic agent, the raw material system can synchronously carry out polymerization and hydrolysis processes, the chain extension polymerization process is easier to control, and the hydrolysis process is more uniform, so that the water-solubility of the product is ensured while the product has higher molecular weight, the aim of comprehensively regulating and controlling the molecular weight, the inhibition effect and the water solubility of the product is fulfilled, and the industrial requirements of the polyacrylamide potassium salt coating inhibitor for the drilling fluid are greatly met.
In the preparation method of the invention, the potassium carbonate and the potassium bicarbonate are adopted as the composite hydrolysis agent, and generally, the stronger the alkalinity of the hydrolysis agent is, the better the hydrolysis effect is. The invention adopts potassium carbonate and potassium bicarbonate, and the mass ratio is 1: the mixture of (2-3) is relatively weak in alkalinity as a hydrolysis agent, and the hydrolysis agent can lower the pH value of a polymerization system at the initial stage of the reaction, so that the polymerization reaction is facilitated. After polymerization is carried out to a certain extent, the potassium bicarbonate can gradually release water and carbon dioxide due to high-temperature decomposition to generate potassium carbonate, so that the PH value of the system is increased, and the hydrolysis reaction is promoted, thereby realizing comprehensive regulation and control of the polymerization and hydrolysis degree. In addition, the invention adopts the potassium bicarbonate with higher content, carbon dioxide emitted in the decomposition process can take away part of heat, the system temperature is reduced, the product is prevented from being cohered, holes can be left after the carbon dioxide is released, the spongy product appearance is obtained, and the improvement of the solubility of the product is promoted.
Further, the invention increases the complexation of disodium ethylenediamine tetraacetate to remove metal ions in the aqueous solution, and simultaneously plays a role in further improving the molecular weight of the polymer and the water solubility of the product. Preferably, the dosage of the disodium ethylenediamine tetraacetate is 0.10-0.20% of the mass of water used in the acrylamide monomer aqueous solution.
In the polymerization system, in order to further improve the mixing uniformity of the composite system, thereby ensuring the balance of polymerization and hydrolysis processes and finally realizing the comprehensive improvement of the molecular weight and the water-soluble effect of the product, the invention further increases the molecular weight of the urea and the water-soluble effect of the product. Preferably, the urea is used in an amount of 3.5 to 4.0 percent of the mass of the acrylamide monomer.
After the redox initiator is added, the composite system of the invention carries out polymerization and hydrolysis reaction simultaneously, thereby comprehensively regulating and controlling the molecular weight and water-soluble effect of the product. Preferably, the redox initiator consists of an oxidant and a reducing agent, wherein the amount of the oxidant is 0.07-0.15% of the mass of the acrylamide monomer, and the amount of the reducing agent is 0.07-0.15% of the mass of the acrylamide monomer.
The invention is not particularly limited in the kind of the specific oxidizing agent and the reducing agent, as long as the requirements of aqueous solution copolymerization can be satisfied. Further preferably, the oxidant is potassium persulfate or ammonium persulfate; the reducing agent is sodium sulfite or sodium bisulfite.
After the step (1) is carried out, a spongy product is obtained, and the spongy product can be crushed and dried in advance by adopting a conventional treatment method, and then crushed and sieved. Preferably, the temperature of the drying is 70-85 ℃. More preferably, the number of screen meshes used in the sieving is 30 to 50 mesh, and still more preferably 40 mesh.
The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid provided by the invention has the advantages of simple steps and low cost, and is suitable for industrial production. Experimental results show that the polyacrylamide potassium salt coating inhibitor prepared by the preparation method provided by the invention has the characteristics that the intrinsic viscosity is more than 10.4, the product has good water solubility, the hydrolysis degree is between 30.05% and 32.58%, the dissolution time in water is only 255-260 s at the concentration of 0.5%, the core wire expansion reduction rate reaches 81-85%, and the minimum technical index requirement of the coating inhibitor for drilling fluid is far exceeded by the petroleum industry standard (SY/T5946-2019).
Detailed Description
The following is a detailed description of the preparation method of the polyacrylamide potassium salt coating inhibitor for drilling fluid according to the present invention with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid comprises the following specific steps:
(1) In a clean four-mouth bottle, 100g of an aqueous solution of an acrylamide monomer with a mass concentration of 40% (prepared by adding 40g of acrylamide into 60g of deionized water), 4.0g of potassium carbonate, 10.0g of potassium bicarbonate, 1.5g of urea and 0.06g of disodium ethylenediamine tetraacetate (EDTA-2 Na) are respectively added, stirring is carried out for 30min to dissolve completely, then the system is controlled to be at 30 ℃, nitrogen is introduced to drive oxygen for 30min, and under the protection of nitrogen, 2.0mL of ammonium persulfate with a mass concentration of 2.5% and 2.0mL of sodium bisulphite with a mass concentration of 2.5% are added for stirring reaction. Recording the system temperature, stopping stirring when the system temperature is 2-3 ℃ higher than the set temperature, pouring the reactant into an enamel cup, and standing for reaction for 6 hours at an opening to obtain a spongy reactant;
(2) The spongy reactant was crushed and dried at 80 c for 10 hours, and then crushed and sieved through a 40 mesh sieve, to obtain the polyacrylamide potassium salt coating inhibitor product for drilling fluid of example 1.
Example 2
The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid comprises the following specific steps:
(1) In a clean four-mouth bottle, 100g of an aqueous solution of an acrylamide monomer with the mass concentration of 40%, 5.0g of potassium carbonate, 10.0g of potassium bicarbonate, 1.5g of urea and 0.06g of disodium ethylenediamine tetraacetate (EDTA-2 Na) are respectively added, stirring is carried out for 30min to dissolve completely, then the set temperature of the system is controlled to be 30 ℃, nitrogen is introduced to drive oxygen for 30min, and under the protection of nitrogen, 1.6mL of ammonium persulfate with the mass concentration of 2.5% and 1.6mL of sodium bisulphite with the mass concentration of 2.5% are added for stirring reaction. Recording the system temperature, stopping stirring when the system temperature is 2-3 ℃ higher than the set temperature, pouring the reactant into an enamel cup, and standing for reaction for 6 hours at an opening to obtain a spongy reactant;
(2) The spongy reactant was crushed and dried at 80 c for 10 hours, and then crushed and sieved through a 40 mesh sieve, to obtain the polyacrylamide potassium salt coating inhibitor product for drilling fluid of example 2.
Example 3
The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid comprises the following specific steps:
(1) In a clean four-mouth bottle, 100g of an aqueous solution of an acrylamide monomer with the mass concentration of 40%, 4.0g of potassium carbonate, 12.0g of potassium bicarbonate, 1.5g of urea and 0.06g of disodium ethylenediamine tetraacetate (EDTA-2 Na) are respectively added, stirred for 30min to dissolve completely, then the set temperature of the system is controlled to be 30 ℃, nitrogen is introduced to drive oxygen for 30min, and under the protection of nitrogen, 1.3mL of ammonium persulfate with the mass concentration of 2.5% and 1.3mL of sodium bisulfite with the mass concentration of 2.5% are added for stirring reaction. Recording the system temperature, stopping stirring when the system temperature is 2-3 ℃ higher than the set temperature, pouring the reactant into an enamel cup, and standing for reaction for 6 hours at an opening to obtain a spongy reactant;
(2) The spongy reactant was crushed and dried at 80 c for 10 hours, and then crushed and sieved through a 40 mesh sieve, to obtain the polyacrylamide potassium salt coating inhibitor product for drilling fluid of example 3.
Comparative example 1
The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid of the comparative example 1 is a copolymerization method commonly adopted in the prior art. The method takes potassium hydroxide, acrylic acid and acrylamide as raw materials, and comprises the following specific steps:
(1) In a 500mL beaker, 220mL of deionized water was added, followed by 19.5g of potassium hydroxide, stirring was performed to dissolve the solution, after cooling to room temperature, 22.6g of acrylic acid was added, and stirring was performed to complete the reaction to a uniform potassium acrylate solution. The reaction equation is CH 2 ＝CH-COOH+KOH＝＝CH 2 ＝CH-COOK+H 2 O；
(2) Adding 75g of acrylamide into the potassium acrylate solution, stirring and dissolving completely, and regulating the pH value of the system to 8.0 by using a potassium hydroxide aqueous solution;
(3) Pouring the mixed solution of potassium acrylate and acrylamide obtained in the step (2) into a clean and dry four-mouth bottle, then placing the bottle into a water bath, mounting a stirrer, a thermometer and a nitrogen inlet pipe, stirring to raise the temperature of the system to 30 ℃, introducing nitrogen for 30min, adding 2.5mL of sodium bisulfite solution with the concentration of 5% under the protection of the stirring and the nitrogen, then adding 2.5mL of ammonium persulfate solution with the concentration of 5% for reaction, recording the temperature of the system, stopping stirring when the temperature of the system is higher than the set temperature of 2-3 ℃, pouring the reactant into an enamel cup, and continuing to react for 6h to obtain a gelatinous reactant;
(4) Crushing the gel reactant, drying for 10 hours at 80 ℃, crushing and sieving with a 40-mesh sieve to obtain the polyacrylamide potassium salt coating inhibitor product for the drilling fluid of the comparative example 1.
Comparative example 2
The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid of the comparative example 2 is a copolymerization method. The specific procedure was essentially the same as in comparative example 1, except that the amounts of the raw materials were varied, using potassium hydroxide, acrylic acid and acrylamide as the raw materials. In this comparative example, the amount of deionized water in step (1) was 180mL, potassium hydroxide was 15.7g, and acrylic acid was 18.4g; 60g of acrylamide in the step (2); in the step (3), the dosage of the sodium bisulfite solution and the ammonium persulfate solution is 2.1mL.
Comparative example 3
The polyacrylamide potassium salt coating inhibitor of this comparative example was prepared in substantially the same manner as the coating inhibitor of example 1, and was prepared by a polymerization hydrolysis method, with the only difference that: the coating inhibitor of this comparative example was prepared without the addition of urea and EDTA-2Na.
Comparative example 4
The polyacrylamide potassium salt coating inhibitor of this comparative example was substantially the same as the coating inhibitor of example 1 in preparation, except that: the coating inhibitor of this comparative example was prepared without adding potassium bicarbonate, while increasing the amount of potassium carbonate to 14.0g.
Comparative example 5
The polyacrylamide potassium salt coating inhibitor of this comparative example was substantially the same as the coating inhibitor of example 1 in preparation, except that: the coating inhibitor of this comparative example was prepared without adding potassium carbonate, while increasing the amount of potassium bicarbonate to 14.0g.
Comparative example 6
The polyacrylamide potassium salt coating inhibitor of this comparative example was substantially the same as the coating inhibitor of example 1 in preparation, except that: the coating inhibitor of this comparative example was prepared by adjusting the amounts of potassium carbonate and potassium bicarbonate to 7.0g.
Experimental example
The polyacrylamide potassium salt coating inhibitors prepared in the above examples 1 to 3 and comparative examples 1 to 6 were subjected to performance tests, the test indexes including moisture content, purity, intrinsic viscosity, degree of hydrolysis, K + Content, linear expansion rate of the core and time for stirring to be completely dissolved in water at concentration of 0.5%. In the above indexes, when the time of stirring and dissolving the coating inhibitor with the concentration of 0.5% in water is tested, the time for stirring and dissolving the coating inhibitor with the same mass in water is used for preparing the liquid with the mass concentration of 0.5%, and the test methods of the other indexes are all carried out by referring to the oil industry standard SY/T5946-2019 drilling fluid and coating inhibitor polyacrylamide potassium salt. The results are shown in Table 1.
TABLE 1 results of primary Performance test of Polyacrylamide Potassium salt coating inhibitors
As can be seen from Table 1, compared with the comparative example, the polyacrylamide potassium salt coating inhibitor product for drilling fluid prepared by the preparation method provided by the invention has the obvious technical advantages of improving the molecular weight of the product, improving the inhibition and water solubility, further improving the quality of the polyacrylamide potassium salt coating inhibitor product for drilling fluid and expanding the application range of the polyacrylamide potassium salt coating inhibitor product for drilling fluid, wherein the limiting viscosity is 1-3 units higher than that of the existing method, the linear expansion reduction rate of the core is increased by 4% -28%, and the adding amount of 0.5% in distilled water is reduced by at least 10s under the same stirring condition.
Claims (4)
1. The preparation method of the polyacrylamide potassium salt coating inhibitor for the drilling fluid is characterized by comprising the following steps of:
(1) Uniformly stirring and mixing an aqueous solution of an acrylamide monomer, a hydrolysis agent, disodium ethylenediamine tetraacetate and urea, then adding a redox initiator under the protection of nitrogen at a set temperature of 20-40 ℃ for stirring reaction, stopping stirring when the temperature of a reaction system is higher than the set temperature by 2-3 ℃, transferring the obtained reactant, and standing for reaction for 5-7 hours to obtain a spongy product;
(2) Crushing, drying and crushing the spongy product to obtain a polyacrylamide potassium salt coating inhibitor for drilling fluid;
wherein, in the aqueous solution of the acrylamide monomer, the mass concentration of the acrylamide monomer is 30-40%; the hydrolytic agent is potassium carbonate and potassium bicarbonate with the mass ratio of 1: a mixture of (2-3); the consumption of the hydrolytic agent is 35 to 40 percent of the mass of the acrylamide monomer; the dosage of the disodium ethylenediamine tetraacetate is 0.10-0.20% of the mass of water used in the acrylamide monomer aqueous solution; the dosage of the urea is 3.5 to 4.0 percent of the mass of the acrylamide monomer.
2. The method for preparing the polyacrylamide potassium salt coating inhibitor for the drilling fluid according to claim 1, wherein the redox initiator consists of an oxidant and a reducing agent, the amount of the oxidant is 0.07-0.15% of the mass of the acrylamide monomer, and the amount of the reducing agent is 0.07-0.15% of the mass of the acrylamide monomer.
3. The method for producing a polyacrylamide potassium salt coating inhibitor for a drilling fluid according to claim 2, wherein the oxidizing agent is potassium persulfate or ammonium persulfate; the reducing agent is sodium sulfite or sodium bisulfite.
4. The method for producing a polyacrylamide potassium salt coating inhibitor for a drilling fluid according to claim 1, wherein in the step (2), the temperature of the drying is 70 to 85 ℃.
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| CN104619750A (en) * | 2012-09-12 | 2015-05-13 | 埃科莱布美国股份有限公司 | Process for preparing water soluble polymers with no insoluble gels and low levels of residual monomers |
| CN111620973A (en) * | 2017-05-19 | 2020-09-04 | 黄叶芳 | Preparation method of instant anionic high-molecular-weight polyacrylamide |
| CN114605576A (en) * | 2022-03-22 | 2022-06-10 | 爱森（中国）絮凝剂有限公司 | Preparation method of polyacrylamide potassium salt for drilling fluid |
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| GB903368A (en) * | 1959-05-06 | 1962-08-15 | Dow Chemical Co | Process for the production of a water-soluble polymer |
| CN1542027A (en) * | 2003-04-29 | 2004-11-03 | 许振举 | Method for preparing high molecular weight polyacrylamide dried powder |
| CN104619750A (en) * | 2012-09-12 | 2015-05-13 | 埃科莱布美国股份有限公司 | Process for preparing water soluble polymers with no insoluble gels and low levels of residual monomers |
| CN102977243A (en) * | 2012-11-24 | 2013-03-20 | 山东宝莫生物化工股份有限公司 | Method for producing high-hydrolysis polyacrylamide through homopolymerization cohydrolysis |
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| CN114605576A (en) * | 2022-03-22 | 2022-06-10 | 爱森（中国）絮凝剂有限公司 | Preparation method of polyacrylamide potassium salt for drilling fluid |
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