CN112708403A - Petroleum drilling fluid and preparation method thereof - Google Patents
Petroleum drilling fluid and preparation method thereof Download PDFInfo
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- CN112708403A CN112708403A CN202011601569.5A CN202011601569A CN112708403A CN 112708403 A CN112708403 A CN 112708403A CN 202011601569 A CN202011601569 A CN 202011601569A CN 112708403 A CN112708403 A CN 112708403A
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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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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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
- C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/002—Dendritic macromolecules
- C08G83/005—Hyperbranched macromolecules
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Abstract
The scheme relates to an oil drilling fluid and a preparation method thereof, wherein the oil drilling fluid comprises the following components in parts by weight: 1-5 parts of modified fluid loss additive, 5-10 parts of bentonite, 0.5-1 part of lubricant, 20-30 parts of weighting agent, 2-4 parts of rigid plugging agent and 100 parts of water; the modified fluid loss additive is prepared by compounding a cellulose-based hyperbranched polymer, modified humic acid, quaternized chitosan, a silane coupling agent and a surfactant. The invention selects three natural polymers as the matrix materials of the fluid loss additive, and the natural polymers can be uniformly dispersed in a water phase with additives such as a lubricant, a plugging agent and the like after being modified, so that the fluid loss performance of the fluid loss additive is fully exerted; the drilling fluid is environment-friendly and pollution-free, has good rheological property, inhibitive property, plugging property and filtrate loss reduction property under the condition of coal-containing stratum, and has high economic value.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a petroleum drilling fluid and a preparation method thereof.
Background
The drilling fluid is used as the 'blood' of the well drilling, can carry and suspend drill cuttings, cool and clean drill bits and balance formation pressure, and is an important guarantee for realizing safe, high-quality and rapid well drilling work. However, drilling fluid loss is inevitable, and the magnitude of the fluid loss is related to the safety of the drilling process. In addition, with the rapid development of the petroleum industry in China, the drilling of deep wells and ultra-deep wells becomes an inevitable trend, so that the drilling construction form is more severe, and the requirements on high temperature resistance, salt resistance, filtration loss reduction and the like of the drilling fluid are more and more severe. Meanwhile, with the development of social economy, the requirements on reducing storage damage of the drilling fluid and protecting the environment are increasingly improved. Therefore, the prepared petroleum drilling fluid which has no biotoxicity, is beneficial to environmental protection and has high temperature resistance and salt resistance has important practical significance and urgency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the petroleum drilling fluid which is safe and non-toxic in composition, and has high temperature resistance, salt resistance and stronger filtrate loss reduction.
In order to achieve the purpose, the invention provides the following technical scheme:
the petroleum drilling fluid comprises the following components in parts by weight: 1-5 parts of modified fluid loss additive, 5-10 parts of bentonite, 0.5-1 part of lubricant, 20-30 parts of weighting agent, 2-4 parts of rigid plugging agent and 100 parts of water; the modified fluid loss additive is prepared by compounding a cellulose-based hyperbranched polymer, modified humic acid, quaternized chitosan, a silane coupling agent and a surfactant.
Further, the modified fluid loss additive is prepared by dispersing 30-50% of cellulose-based hyperbranched polymer, 20-30% of modified humic acid, 10-20% of quaternized chitosan, 5-10% of silane coupling agent, 1-3% of surfactant and 30-50% of water at high speed, and obtaining the modified fluid loss additive after the dispersion is finished.
Further, the cellulose-based hyperbranched polymer is prepared by the following steps:
1) preparation of amino-terminated hyperbranched polymers: adding diethylenetriamine into a reaction bottle, placing the reaction bottle in an ice-water bath environment, continuously introducing nitrogen into the reaction bottle, mixing equimolar methyl acrylate and methanol, dropwise adding the mixture into the reaction, stirring the mixture for 4 hours at room temperature after the dropwise addition is finished, removing the methanol by rotary evaporation, and then placing the reaction bottle in an oil bath kettle for condensation polymerization to obtain an amino-terminated hyperbranched polymer;
2) preparation of carboxylated cellulose: adding the cellulose alkalized by sodium hydroxide into a reaction bottle, and adding prepared chlorosulfonic acid and chloroform for sulfonation reaction under the condition of constant-temperature water bath to obtain sodium cellulose sulfonate; adding catalyst perchloric acid, sodium cellulose sulfonate and maleic anhydride into a reaction bottle, adding ethyl acetate as a solvent, stirring and refluxing for 4 hours at 60 ℃, and removing the solvent by reduced pressure distillation to obtain carboxylated cellulose;
3) preparation of cellulose-based hyperbranched polymer: dissolving the amino-terminated hyperbranched polymer in ethanol, then adding the carboxylated cellulose, then stirring and refluxing the mixture under the nitrogen atmosphere, centrifuging and filtering the obtained product, washing 3-5 times by using deionized water and ethanol, and then drying in vacuum to obtain the cellulose-based hyperbranched polymer.
Preferably, in the step 2), the mass ratio of chlorosulfonic acid to chloroform is 2-3: 1; the mass ratio of the sodium cellulose sulfonate to the maleic anhydride to the perchloric acid is 1-5: 10: 0.1-0.2.
Preferably, in the step 3), the concentration of the amino-terminated hyperbranched polymer dissolved in ethanol is 20g/L, the mass ratio of the carboxylated cellulose to the amino-terminated hyperbranched polymer is 0.05:1, and the reflux condition is that the mixture is refluxed for 12 hours at 80-90 ℃.
Further, adding a potassium persulfate aqueous solution into a reaction bottle containing humic acid, placing the reaction bottle in an environment of 80 ℃, slowly dropwise adding a mixed monomer aqueous solution of sodium p-styrenesulfonate and 2-acrylamide-2-methylpropanesulfonic acid under a stirring condition, and after dropwise adding, keeping the temperature and reacting for 3 hours to obtain the modified humic acid.
Preferably, the mass ratio of the humic acid to the sodium p-styrene sulfonate to the 2-acrylamide-2-methylpropanesulfonic acid is 2:0.5:1, and the amount of the potassium persulfate is 2-4%.
And further, adding chitosan and isopropanol into a reaction bottle, stirring for 15min at 65 ℃, then heating to 85 ℃, slowly dropwise adding an epoxypropyltrimethylammonium chloride solution, reacting for 12h at constant temperature, filtering after the reaction is finished, washing, and drying to obtain the quaternized chitosan.
Preferably, the concentration of the chitosan in the isopropanol is 0.1g/ml, and the volume ratio of the epoxypropyltrimethylammonium chloride solution to the isopropanol is 1-1.5: 1.
Further, the lubricant is preferably sulfonated castor oil; the weighting agent is preferably one or more of iron ore powder, barite, calcium carbonate powder and hematite powder; the rigid blocking agent is preferably ZD-1 blocking agent.
The invention further provides a preparation method of the petroleum drilling fluid, which comprises the steps of uniformly stirring and mixing water and bentonite at the stirring speed of 2500-3500r/min, and standing for 24 hours in a closed manner; then adding the modified fluid loss additive, the lubricant, the rigid plugging agent and the weighting agent, and uniformly stirring at the stirring speed of 7000-9000r/min to prepare the petroleum drilling fluid.
The invention has the beneficial effects that: compared with the prior art, the invention selects three natural polymer materials for chemical modification, the hyperbranched polymer grafted cellulose containing amido bonds has the filtrate loss reducing performance and can be used in common drilling operation, but the high temperature resistance and the salt tolerance are poorer, so the modified humic acid and the quaternized chitosan are compounded in the invention to improve the high temperature resistance, the salt resistance and the calcium resistance of the filtrate loss reducer; the high temperature resistance and salt resistance of the drilling fluid are improved by the graft copolymerization of humic acid, sodium p-styrenesulfonate and 2-acrylamide-2-methylpropanesulfonic acid, the salt resistance and calcium resistance of the drilling fluid are further improved by the quaternized chitosan, and the fluid loss agent prepared by matching with a surfactant and a silane coupling agent can be used in complex drilling operation; the three natural polymers are used as matrix materials of the fluid loss additive, and after the modification of various natural polymers, the natural polymers can be uniformly dispersed in a water phase together with auxiliary agents such as a lubricant, a plugging agent and the like, so that the fluid loss performance of the fluid loss additive is fully exerted; the drilling fluid is environment-friendly and pollution-free, has good rheological property, inhibitive property, plugging property and filtrate loss reduction property under the condition of coal-containing stratum, and has high economic value.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Firstly, the method comprises the following steps: preparation of cellulose-based hyperbranched polymer:
1) preparation of amino-terminated hyperbranched polymers: adding diethylenetriamine into a reaction bottle, placing the reaction bottle in an ice-water bath environment, continuously introducing nitrogen into the reaction bottle, mixing equimolar methyl acrylate and methanol, dropwise adding the mixture into the reaction, stirring the mixture for 4 hours at room temperature after the dropwise addition is finished, removing the methanol by rotary evaporation, and then placing the reaction bottle in an oil bath kettle for condensation polymerization to obtain an amino-terminated hyperbranched polymer;
2) preparation of carboxylated cellulose: adding the cellulose alkalized by sodium hydroxide into a reaction bottle, and adding prepared chlorosulfonic acid and chloroform (m: m is 2.5:1) to perform sulfonation reaction under the condition of a constant-temperature water bath at 40 ℃ to obtain sodium cellulose sulfonate; adding catalyst perchloric acid (10ml), sodium cellulose sulfonate (100mg) and maleic anhydride (1g) into a reaction bottle, adding ethyl acetate as a (100ml) solvent, stirring and refluxing for 4h at 60 ℃, and removing the solvent by reduced pressure distillation to obtain carboxylated cellulose;
3) preparation of cellulose-based hyperbranched polymer: dissolving 10g of the amino-terminated hyperbranched polymer in 500ml of ethanol, subsequently adding the 0.5g of the carboxylated cellulose, stirring the mixture under nitrogen atmosphere, refluxing at 80-90 ℃ for 12h, centrifuging and filtering the obtained product, washing 3-5 times with deionized water and ethanol, and then drying in vacuum to obtain the cellulose-based hyperbranched polymer.
In the invention, the cellulose-based hyperbranched polymer is obtained by directly grafting the hyperbranched polymer to the surface of cellulose in a grafting-to mode by utilizing the reaction of carboxyl at the tail end of the cellulose and amino at the tail end of the hyperbranched polymer, a huge network structure is formed on the surface of the cellulose, and the polymer chain contains abundant amido bonds. Compared with a linear structure, the highly branched polymer chain has smaller size and no winding of intra-molecular chain or inter-chain bonds, so that the viscosity of the highly branched polymer chain is lower than that of a linear polymer macroscopically, the highly branched polymer chain has strong fluidity and is not easy to aggregate, the fluid loss reduction performance of the highly branched polymer chain is ensured, meanwhile, the drilling speed in drilling operation is not influenced, and the highly branched polymer chain has better economic benefit; the clay particles are adsorbed to the reticular polymer chains through amido bonds, so that the dispersibility of the clay is improved, the clay particles are kept stable and are not easy to agglomerate; the polymer chain is relatively small in size, so that gaps of filter cakes can be effectively blocked, compact filter cakes are formed, and the filtration loss of the drilling fluid is reduced; meanwhile, the cellulose grafted by the hyperbranched polymer changes the space structure of the cellulose and improves the heat resistance of the polymer. The cellulose-based hyperbranched polymer can be used as a fluid loss additive in general drilling operation. However, certain defects still exist in a high-temperature and high-salt environment, so that the heat resistance, salt tolerance and stability of the modified humic acid and quaternized chitosan are further improved by compounding the modified humic acid and the quaternized chitosan.
II, secondly: preparation of modified humic acid
The humic acid macromolecular complex mixture does not have a specific structure and a chemical configuration, each structural unit for forming the humic acid is mainly an aromatic ring and a reactive functional group, the reactive functional group comprises hydroxyl, carboxyl, amino, carbonyl and the like, one structural unit of the humic acid (R represents other structural units containing different reactive functional groups) is given in the following formula, and in-situ free radical copolymerization of vinyl monomers can be carried out by utilizing the hydroxyl. Adding a 4% potassium persulfate aqueous solution into a reaction bottle containing 10g of humic acid, placing the reaction bottle in an environment of 80 ℃, slowly dropwise adding a mixed monomer aqueous solution of 2.5g of sodium p-styrenesulfonate and 5g of 2-acrylamide-2-methylpropanesulfonic acid under the stirring condition, and after dropwise adding, carrying out heat preservation reaction for 3 hours to obtain the modified humic acid.
The surface of humic acid has rich groups such as hydroxyl, carboxyl and the like, but the heat resistance and salt resistance are poor when the humic acid is directly applied to a filtrate reducer, and the polymer chain contains benzene rings, amido bonds and sulfonic acid groups through chemical grafting modification, so that the stability of the polymer and clay particles can be effectively improved, and the introduced benzene rings can effectively improve the bonding strength of the modified humic acid at high temperature, thereby improving the heat resistance of the modified humic acid; the amide group can improve the adsorption capacity of the polymer at high temperature, and the sulfonic acid group is not sensitive to salt, so that the salt resistance of the polymer is further improved. In addition, the monomers selected in the invention have certain regularity after polymerization, certain gaps are formed among benzene rings, amido bonds and sulfonic acid groups, the performance reduction caused by the steric hindrance effect is effectively avoided, and meanwhile, the sulfonic acid groups are arranged at the tail ends of the side chains, so that the sulfonic acid groups can enter into hyperbranched polymer chains and can firmly adsorb cellulose-based hyperbranched polymers, thereby improving the heat resistance and salt resistance of the cellulose-based hyperbranched polymers.
Thirdly, the method comprises the following steps: preparation of quaternized chitosan
Adding 5g of chitosan and 50ml of isopropanol into a reaction bottle, stirring for 15min at 65 ℃, then heating to 85 ℃, slowly dropwise adding 60ml of epoxypropyl trimethyl ammonium chloride solution (the mass fraction is 40%), reacting for 12h at constant temperature, filtering after the reaction is finished, washing and drying to obtain the quaternized chitosan.
The quaternized chitosan is beneficial to the stretching of macromolecules such as cellulose-based hyperbranched polymers and modified humic acid, so that a spatial network structure can be formed in a system; meanwhile, the quaternized chitosan also has certain salt resistance and calcium resistance, and the performance of the filtrate reducer is further improved.
The cellulose-based hyperbranched polymer, the modified humic acid, the quaternized chitosan, the silane coupling agent, the surfactant and the water are mixed and then dispersed at a high speed to prepare the modified fluid loss additive, and the modified fluid loss additive can be used for drilling fluid to obtain the following application examples.
Application example 1:
uniformly stirring and mixing 100 parts of water and 5 parts of bentonite at a stirring speed of 2500r/min, and standing for 24 hours in a closed manner; and then adding 1 part of modified fluid loss additive, 0.5 part of lubricant, 2 parts of rigid plugging agent and 20 parts of weighting agent, and uniformly stirring at the stirring speed of 7000r/min to prepare the petroleum drilling fluid. The modified fluid loss additive is prepared by dispersing 30% of cellulose-based hyperbranched polymer, 20% of modified humic acid, 10% of quaternized chitosan, 5% of silane coupling agent, 1% of surfactant and the balance of water at high speed.
Application example 2:
uniformly stirring and mixing 100 parts of water and 8 parts of bentonite at a stirring speed of 3000r/min, and standing for 24 hours in a closed manner; and then adding 3 parts of modified fluid loss additive, 0.7 part of lubricant, 3 parts of rigid plugging agent and 25 parts of weighting agent, and uniformly stirring at a stirring speed of 8000r/min to obtain the petroleum drilling fluid. The modified fluid loss additive is prepared by dispersing 40% of cellulose-based hyperbranched polymer, 25% of modified humic acid, 15% of quaternized chitosan, 8% of silane coupling agent, 2% of surfactant and the balance of water at high speed.
Application example 3:
uniformly stirring and mixing 100 parts of water and 10 parts of bentonite at a stirring speed of 3500r/min, and sealing and standing for 24 hours; and then adding 5 parts of modified fluid loss additive, 1 part of lubricant, 4 parts of rigid plugging agent and 30 parts of weighting agent, and uniformly stirring at a stirring speed of 9000r/min to obtain the petroleum drilling fluid. The modified fluid loss additive is prepared by dispersing 50% of cellulose-based hyperbranched polymer, 30% of modified humic acid, 20% of quaternized chitosan, 10% of silane coupling agent, 3% of surfactant and the balance of water at high speed.
The properties of the petroleum drilling fluid prepared in application examples 1-3 are measured, the results are shown in Table 1, the apparent viscosity, the plastic viscosity and the high-temperature high-pressure filtration loss are measured according to a GB/T16783 method, and the aging condition is 260 ℃ and 16 hours. The data in the following table show that the drilling fluid provided by the invention has good rheological property, good static shear force and low filtration loss under high-salt, high-temperature and high-pressure conditions, and the petroleum drilling fluid provided by the invention has excellent performance.
TABLE 1
| Base pulp | Application example 1 | Application example 2 | Application example 3 | |
| Apparent viscosity/mPa.s | 13.8 | 17.9 | 18.3 | 18.8 |
| Plastic viscosity/mPa.s | 9.5 | 10.9 | 11.8 | 12.4 |
| Dynamic shear force/Pa | 4.6 | 5.6 | 6.1 | 6.9 |
| High temperature high pressure fluid loss/ml | 80.6 | 24.5 | 23.7 | 22.8 |
| After aging | - | Stable dispersion of | Stable dispersion of | Stable dispersion of |
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (10)
1. The petroleum drilling fluid is characterized by comprising the following components in parts by weight: 1-5 parts of modified fluid loss additive, 5-10 parts of bentonite, 0.5-1 part of lubricant, 20-30 parts of weighting agent, 2-4 parts of rigid plugging agent and 100 parts of water; the modified fluid loss additive is prepared by compounding a cellulose-based hyperbranched polymer, modified humic acid, quaternized chitosan, a silane coupling agent and a surfactant.
2. The oil drilling fluid according to claim 1, wherein the modified fluid loss additive is prepared by dispersing 30-50% of cellulose-based hyperbranched polymer, 20-30% of modified humic acid, 10-20% of quaternized chitosan, 5-10% of silane coupling agent, 1-3% of surfactant and the balance of water at a high speed, and obtaining the modified fluid loss additive after the dispersion is finished.
3. The oil drilling fluid of claim 1, wherein the cellulose-based hyperbranched polymer is prepared by:
1) adding diethylenetriamine into a reaction bottle, placing the reaction bottle in an ice-water bath environment, continuously introducing nitrogen into the reaction bottle, mixing equimolar methyl acrylate and methanol, dropwise adding the mixture into the reaction, stirring the mixture for 4 hours at room temperature after the dropwise addition is finished, removing the methanol by rotary evaporation, and then placing the reaction bottle in an oil bath kettle for condensation polymerization to obtain an amino-terminated hyperbranched polymer;
2) adding the cellulose alkalized by sodium hydroxide into a reaction bottle, and adding prepared chlorosulfonic acid and chloroform for sulfonation reaction under the condition of constant-temperature water bath to obtain sodium cellulose sulfonate; adding catalyst perchloric acid, sodium cellulose sulfonate and maleic anhydride into a reaction bottle, adding ethyl acetate as a solvent, stirring and refluxing for 4 hours at 60 ℃, and removing the solvent by reduced pressure distillation to obtain carboxylated cellulose;
3) preparation of cellulose-based hyperbranched polymer: dissolving the amino-terminated hyperbranched polymer in ethanol, then adding the carboxylated cellulose, then stirring and refluxing the mixture under the nitrogen atmosphere, centrifuging and filtering the obtained product, washing 3-5 times by using deionized water and ethanol, and then drying in vacuum to obtain the cellulose-based hyperbranched polymer.
4. The oil drilling fluid according to claim 3, wherein in the step 2), the mass ratio of chlorosulfonic acid to chloroform is 2-3: 1; the mass ratio of the sodium cellulose sulfonate to the maleic anhydride to the perchloric acid is 1-5: 10: 0.1-0.2.
5. The oil drilling fluid according to claim 3, wherein in the step 3), the concentration of the amino-terminated hyperbranched polymer dissolved in ethanol is 20g/L, the mass ratio of the carboxylated cellulose to the amino-terminated hyperbranched polymer is 0.05:1, and the reflux condition is reflux at 80-90 ℃ for 12 h.
6. The oil drilling fluid according to claim 1, wherein the modified humic acid is prepared by adding an aqueous solution of potassium persulfate into a reaction flask containing humic acid, placing the reaction flask in an environment of 80 ℃, slowly dropwise adding an aqueous solution of a mixed monomer of sodium p-styrenesulfonate and 2-acrylamide-2-methylpropanesulfonic acid under stirring, and after dropwise adding, carrying out heat preservation reaction for 3 hours.
7. The oil drilling fluid according to claim 6, wherein the mass ratio of the humic acid to the sodium p-styrene sulfonate to the 2-acrylamide-2-methylpropanesulfonic acid is 2:0.5:1, and the amount of the potassium persulfate is 2-4%.
8. The oil drilling fluid according to claim 1, wherein the quaternized chitosan is prepared by adding chitosan and isopropanol into a reaction flask, stirring for 15min at 65 ℃, then heating to 85 ℃, slowly adding a solution of epoxypropyltrimethylammonium chloride dropwise, reacting for 12h at constant temperature, filtering after the reaction is finished, washing, and drying.
9. The oil drilling fluid according to claim 8, wherein the concentration of chitosan in isopropanol is 0.1g/ml, and the volume ratio of the solution of epoxypropyltrimethylammonium chloride to isopropanol is 1-1.5: 1.
10. The preparation method of the petroleum drilling fluid as claimed in any one of claims 1 to 9, wherein water and bentonite are uniformly stirred and mixed at a stirring speed of 2500-; then adding the modified fluid loss additive, the lubricant, the rigid plugging agent and the weighting agent, and uniformly stirring at the stirring speed of 7000-9000r/min to prepare the petroleum drilling fluid.
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Cited By (5)
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| CN112898955A (en) * | 2021-01-15 | 2021-06-04 | 西安通源正合石油工程有限公司 | High temperature high pressure oil-based mud system |
| CN113736435A (en) * | 2021-10-08 | 2021-12-03 | 扬州工业职业技术学院 | Nano microemulsion plugging agent for drilling fluid and preparation method thereof |
| CN114591719A (en) * | 2022-04-18 | 2022-06-07 | 安徽陆海石油助剂科技有限公司 | Filtrate reducer for oil-based drilling fluid |
| CN115572585A (en) * | 2022-10-08 | 2023-01-06 | 北京远东联创科技有限责任公司 | High-temperature-resistant oil-based drilling fluid emulsifier and preparation method thereof |
| CN115260404B (en) * | 2022-09-02 | 2023-11-03 | 中国石油大学(华东) | High-temperature-resistant hydrophobic nano plugging agent for water-based drilling fluid and preparation method and application thereof |
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| CN115572585A (en) * | 2022-10-08 | 2023-01-06 | 北京远东联创科技有限责任公司 | High-temperature-resistant oil-based drilling fluid emulsifier and preparation method thereof |
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Application publication date: 20210427 |