CN110804169A - Water-based drilling fluid lubricant, magnetic polyether used by same and preparation method thereof - Google Patents
Water-based drilling fluid lubricant, magnetic polyether used by same and preparation method thereof Download PDFInfo
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- CN110804169A CN110804169A CN201911147039.5A CN201911147039A CN110804169A CN 110804169 A CN110804169 A CN 110804169A CN 201911147039 A CN201911147039 A CN 201911147039A CN 110804169 A CN110804169 A CN 110804169A
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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
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2603—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
- C08G65/2606—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups
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- 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
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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
- C09K2208/10—Nanoparticle-containing well treatment fluids
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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 invention relates to a magnetic polyether for a water-based drilling fluid lubricant, a preparation method and application thereof, wherein hydroxylated magnetic nanoparticles are used as an initiator, and propylene oxide and butylene oxide are used as structural units for graft copolymerization to obtain the magnetic polyether; the hydroxylated magnetic nanoparticles are hydroxylated Fe3O4The magnetic polyether comprises, by weight, 5% -20% of magnetic nanoparticles, 20% -60% of propylene oxide chain segments and 10% -20% of butylene oxide chain segments. The magnetic polyether for the water-based drilling fluid lubricant provided by the invention shows an excellent targeted lubrication effect, obviously improves the adsorption effect of the lubricant on the surface of a drilling tool, has the advantages of long lubrication duration time, good recycling stability and good compatibility with different water-based drilling fluids, and is particularly suitable for long open hole horizontal wells.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling, particularly relates to the field of high-performance water-based drilling fluid high-efficiency lubricants, and particularly relates to a water-based drilling fluid lubricant and magnetic polyether used by the same.
Background
The water-based drilling fluid still has the technical problems of frequent supporting and pressing, drill sticking and the like and insufficient water power transmission and the like in the construction process of a long horizontal section complex structure well, and the main reason is that the lubricating continuity of a lubricant in the water-based drilling fluid is insufficient. Therefore, research and development on the continuous lubricity of the water-based drilling fluid lubricant and improvement on the continuous lubricity of the oil lubricant are important parts for application of the water-based drilling fluid in a long open hole horizontal well in the future.
Patent CN201711091999 adopted C10-C18The mono-organic acid and the alcohol are subjected to esterification reaction to synthesize the non-ionic lubricant, so that the interference of ionic components in the drilling fluid on the lubricating performance is effectively avoided.
In the patent CN201810754751, α -olefin is used as an oily lubricating component, composite nano-silica is used as a high-performance lubricant, and the lubricating agent added into drilling fluid can improve the lubricating property of the drilling fluid and reduce friction resistance and torque in the drilling process.
In patent CN201810367132, molybdenum dialkyl dithiocarbamate and molybdenum dialkyl dithiophosphate are used as important components of a liquid lubricant, both of which are oil-soluble organic molybdenum compounds, and a secondary structure film is formed on a friction surface under high pressure formed by contact between a drilling tool and a well wall, so that the secondary structure film is not easily damaged and has good lubricating and antifriction effects.
The newly developed lubricant described above has two advantages: (1) the nonionic lubricating active component is adopted to effectively avoid the mutual negative interference between the lubricant and the water-based drilling fluid, so that the overall operation efficiency is improved; (2) the lubricating effect is improved by adopting the rolling friction of nano inorganic materials or adsorbing the drilling tool by organic molybdenum under the limit pressure.
However, the water-based drilling fluid lubricant neglects the problems that the lubricant is preferentially adsorbed to the surface of solid-phase particles in drilling fluid in the competitive adsorption and film formation process of drilling tools and drilling fluid solid-phase particles, and the consumption speed of effective lubricating components is too high after the effective lubricating components are adsorbed by formation minerals such as drill cuttings and the like, and cannot effectively solve the problem of long-horizontal-section continuous lubrication. The magnetic lubricating material capable of having lasting lubricating performance under high-difficulty complex working conditions is still in a blank state.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the magnetic polyether for the water-based drilling fluid lubricant, which has good compatibility with an oily lubricant, high lubricity, high foam inhibition effect and excellent comprehensive performance, and can be widely applied to the high-performance water-based drilling fluid lubricant of a long open hole horizontal well to meet higher use requirements.
Therefore, one of the objectives of the present invention is to provide a magnetic polyether for a water-based drilling fluid lubricant, wherein the magnetic polyether is a modified magnetic nanoparticle obtained by graft copolymerization of a hydroxylated magnetic nanoparticle and propylene oxide/butylene oxide; in the magnetic polyether structure, hydroxylated magnetic nanoparticles are used as an initiator, and propylene oxide and butylene oxide are used as copolymerization structural units;
optionally, the butylene oxide is 1, 2-butylene oxide.
Optionally, the magnetic polyether comprises a main chain structure represented by the following formula (1):
wherein is a hydroxylated magnetic nanoparticle; n is 5-12, m is 2-5; the molecular weight of the single magnetic polyether main chain is 700-2000.
The hydroxylated magnetic nano-particles are hydroxylated Fe3O4Any one or any two or more than two of Ni-Fe and cobalt oxide nano particles are mixed in any proportion;
wherein the average particle size of the hydroxylated magnetic nanoparticles is between 10 and 50 nm.
Optionally, the magnetic polyether contains, by mass, 5-20% of hydroxylated magnetic nanoparticles, 20-60% of propylene oxide chain segments, and 10-20% of butylene oxide chain segments.
The magnetic polyether enables the polyether chain segment and the magnetic nano-particles to be connected together through chemical bonds, and has good chemical stability; the magnetic polyether has good intersolubility with lubricating oil base oil such as vegetable oil, derivatives thereof, mineral oil and the like, the whole lubricant has magnetism, the magnetic lubricant can be effectively adsorbed on the surface of a drilling tool in the competitive adsorption process of stratum mineral components and an iron drilling tool, and the service life of the lubricant is improved; the oil-soluble magnetic polyether has the function of inhibiting the foaming of a surfactant in a lubricant, effectively inhibits the foaming of the water-based drilling fluid caused by the lubricant, and improves the using effect of the lubricant.
The invention also aims to provide a method for preparing the magnetic polyether for the water-based drilling fluid lubricant, which comprises the following steps:
(1) respectively weighing hydroxylated magnetic nanoparticles and a liquid alkaline catalyst in a weight ratio of 5: 1-10: 1, fully mixing at room temperature, heating a reaction system to 70-90 ℃ under the protection of nitrogen with the purity of 99.99%, keeping the reaction temperature, respectively adding epoxy propane and epoxy butane into the reaction system, mechanically stirring at constant temperature for 12-24 hours, stopping stirring, naturally cooling to room temperature, and slowly adding methanol into the reaction system to terminate polyether chain segments with methyl groups to obtain a magnetic polyether crude product;
(2) and (3) decompressing the crude magnetic polyether product obtained in the step (1) to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of the system to be neutral, washing with deionized water, standing for separating liquid to remove a water phase, and drying to obtain an oil-phase magnetic polyether product, namely the magnetic polyether for the water-based drilling fluid lubricant.
Wherein, the liquid alkaline catalyst used in the step (1) is any one or a mixture of any two or more than two of monomethylamine, dimethylamine and trimethylamine which are mixed according to any proportion.
The invention also aims to provide a water-based drilling fluid lubricant, which comprises an oily lubricating component and a magnetic polyether component, wherein the magnetic polyether is the magnetic polyether for the water-based drilling fluid lubricant or the magnetic polyether prepared by the method.
The invention also aims to provide the application of the magnetic polyether for the water-based drilling fluid lubricant or the magnetic polyether prepared by the method in the water-based drilling fluid lubricant.
The invention also aims to provide a drilling fluid containing the water-based drilling fluid lubricant and application of the drilling fluid in a long open hole section horizontal well.
Compared with the prior art, the technical scheme of the invention has the following advantages and progresses:
the magnetic polyether for the water-based drilling fluid lubricant can enable the whole oily lubricant to have magnetism, and the lubricant can be preferentially adsorbed to the surface of a drilling tool in the competitive adsorption process of a mineral solid phase and an iron drilling tool, so that the reduction of the lubricating effect caused by the fact that drilling cuttings generated continuously and continuously carry effective lubricating components to separate from a drilling fluid system is effectively avoided, and the continuous lubricating effect of the traditional oily lubricant is obviously improved. Meanwhile, the magnetic polyether component also has a good foam inhibition effect, so that the foaming of the drilling fluid caused by the surface active component in the water-based drilling fluid lubricant can be effectively avoided, and the lubricating effect is improved. The water-based drilling fluid lubricant using the magnetic polyether as the functional lubricating component has the advantages of strong extreme pressure lubricating effect of the traditional oily lubricant, long lubricating duration, good recycling stability and good compatibility with different water-based drilling fluids, and is particularly suitable for developing high-performance water-based drilling fluid lubricants for long open hole horizontal wells.
Detailed Description
Embodiments of the present invention will be described in detail with reference to examples, which do not indicate specific conditions, according to conventional conditions or conditions recommended by manufacturers. The reagents or instruments used are conventional products which are commercially available.
Example 1
Preparation of magnetic polyether: weighing 6g of hydroxylated nano Fe3O4Fully mixing magnetic particles and 1g of monomethylamine at room temperature, heating a reaction system to 70 ℃ under the protection of nitrogen with the purity of 99.99%, keeping the reaction temperature, respectively adding epoxy propane and 1, 2-epoxybutane into the reaction system, mechanically stirring at constant temperature for 12-24 h, stopping stirring, naturally cooling to room temperature, slowly adding methanol into the reaction system to enable polyether chain segments to be blocked by methyl to obtain magnetic Fe3O4A crude polyether product;
and decompressing the crude product of the magnetic polyether to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of the system to be neutral, washing with deionized water, standing, separating liquid to remove a water phase, and drying to obtain the oil-phase magnetic polyether product.
The weight fraction of the inorganic magnetic particles in the magnetic polyether is 10 percent and the polyether chain segment is 90 percent through thermogravimetry determination.
Preparation of the lubricant: 6 parts of the magnetic polyether obtained in example 1, 40 parts of 5# white oil (oil refinery), 40 parts of rapeseed oil (bioscience, source of good, su) and 16 parts of pentaerythritol oleate (bioscience, inc. in anse) were stirred in a stirring tank at normal temperature and pressure for 1 hour to form a lubricant Lub-01.
Example 2
Preparation of magnetic polyether: weighing 8g of hydroxylated nano Ni-Fe magnetic particles and 1.5g of dimethylamine, fully mixing at room temperature, heating a reaction system to 80 ℃ under the protection of nitrogen with the purity of 99.99%, keeping the reaction temperature, respectively adding 40g of propylene oxide and 30g of 1, 2-butylene oxide into the reaction system, mechanically stirring at the constant temperature of 80 ℃ for 24 hours, stopping stirring, naturally cooling to room temperature, and slowly adding 10g of methanol into the reaction system to seal the polyether chain segment with methyl to obtain a magnetic Ni-Fe polyether crude product;
decompressing the crude product of the magnetic polyether to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of a system to be neutral, washing with deionized water, standing for separating liquid to remove a water phase, and drying to obtain an oil phase magnetic polyether product;
the weight fraction of the inorganic magnetic particles in the magnetic polyether is 12 percent and the polyether chain segment is 88 percent through thermogravimetry determination.
Preparation of the lubricant: 6 parts of the magnetic polyether obtained in example 2, 40 parts of 5# white oil (oil refinery), 40 parts of rapeseed oil (bioscience, source of good, su) and 16 parts of pentaerythritol oleate (bioscience, ltd, in ansqing) were stirred in a stirring tank at normal temperature and pressure for 1 hour to form a lubricant Lub-02.
Example 3
Weighing 14g of hydroxylated nano cobalt oxide magnetic particles and 2g of liquid basic catalyst trimethylamine, fully mixing at room temperature, heating a reaction system to 90 ℃ under the protection of nitrogen with the purity of 99.99%, keeping the reaction temperature, respectively adding 30g of propylene oxide and 30g of 1, 2-butylene oxide into the reaction system, mechanically stirring at the constant temperature of 90 ℃ for 24 hours, stopping stirring, naturally cooling to room temperature, and slowly adding 10g of methanol into the reaction system to seal the polyether chain segment with methyl to obtain a crude magnetic polyether product;
decompressing the crude product of the magnetic polyether to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of a system to be neutral, washing with deionized water, standing for separating liquid to remove a water phase, and drying to obtain an oil phase magnetic polyether product;
the weight fraction of the inorganic magnetic particles in the magnetic polyether is 15 percent and the polyether chain segment is 85 percent through thermogravimetry determination.
Preparation of the lubricant: 6 parts of the magnetic polyether obtained in example 3, 40 parts of 5# white oil (oil refinery), 40 parts of rapeseed oil (bioscience, source of good, su) and 16 parts of pentaerythritol oleate (bioscience, ltd, in ansqing) were stirred in a stirring tank at normal temperature and pressure for 1 hour to form a lubricant Lub-03.
Example 4
Weighing 16g of hydroxylated nano Fe3O4Fully mixing the mixture of the magnetic particles and the hydroxylated nano cobalt oxide magnetic particles with 2g of liquid basic catalyst trimethylamine at room temperature, heating the reaction system to 80 ℃ under the protection of nitrogen with the purity of 99.99 percent, keeping the reaction temperature, and respectively adding 30g of propylene oxide and 30g of 1, 2-butylene oxideAdding the mixture into a reaction system, mechanically stirring at a constant temperature of 80 ℃ for 24 hours, stopping stirring, naturally cooling to room temperature, and slowly adding 10g of methanol into the reaction system to terminate polyether chain segments with methyl groups to obtain a crude magnetic polyether product;
decompressing the crude product of the magnetic polyether to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of a system to be neutral, washing with deionized water, standing for separating liquid to remove a water phase, and drying to obtain an oil phase magnetic polyether product;
the weight fraction of the inorganic magnetic particles in the magnetic polyether is 19 percent and the polyether chain segment is 81 percent through thermogravimetry determination.
Preparation of the lubricant: 6 parts of the magnetic polyether obtained in example 4, 40 parts of 5# white oil (oil refinery), 40 parts of rapeseed oil (bioscience, source of good, su) and 16 parts of pentaerythritol oleate (bioscience, inc. in anse) were stirred in a stirring tank at normal temperature and pressure for 1 hour to form a lubricant Lub-04.
Comparative example
Weighing 30g of propylene oxide, 30g of 1, 2-butylene oxide and 2g of liquid basic catalyst trimethylamine, fully mixing at room temperature, heating the reaction system to 90 ℃ under the protection of nitrogen with the purity of 99.99%, mechanically stirring at the constant temperature of 90 ℃ for 24 hours, stopping stirring, naturally cooling to room temperature, and slowly adding 10g of methanol into the reaction system to ensure that a polyether chain segment is terminated with methyl to obtain a crude polyether product;
decompressing the crude polyether product to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of the system to be neutral, washing with deionized water, standing, separating liquid to remove a water phase, and drying to obtain an oil phase polyether product;
preparation of the lubricant: 6 parts of the oil-soluble polyether prepared in the comparative example, 40 parts of 5# white oil (a petrochemical refinery), 40 parts of rapeseed oil (a source of Fu Suzhou, Biotech limited) and 16 parts of pentaerythritol oleate (a source of Bio-technology limited in Anqing) were stirred in a stirring tank at normal temperature and pressure for 1 hour to form a lubricant Lub-05.
Test example 1
Preparing base slurry: adding 3 parts by weight of anhydrous sodium carbonate and 40 parts by weight of bentonite (standard calcium bentonite of middle petroleum Bohai sea drilling engineering company) into 1000 parts by weight of water while stirring, continuously stirring for 12h after adding, and sealing and standing for 16h to obtain the base slurry.
The base stock and the base stock containing the lubricant (diesel oil is 0# diesel oil from a petrochemical refinery of winners, and white oil is 5# white oil from a petrochemical refinery of winners) were subjected to the determination of the lubricity coefficient: and (3) selecting an FANN212 type extreme pressure lubrication instrument to measure the extreme pressure lubrication coefficient of the unaged liquid to be measured, and calculating the reduction rate of the lubrication coefficient.
(1) Testing density change value and apparent viscosity change value:
adding 0.5 wt% lubricant into the two base slurries, stirring at high speed for 10min, standing for 1min, and measuring the density and apparent viscosity of the base slurry and the sample after loading according to the specification of GB/T16783.1.
The calculation method of the density variation value is shown as formula (1).
Δρ＝|ρ1-ρ0|................................................(1)
In the formula: Δ ρ - -Density change in grams per cubic centimeter (g/cm)3)；ρ1- -the density after loading in grams per cubic centimeter (g/cm)3)；ρ0Density of the base stock in grams per cubic centimeter (g/cm)3)。
The apparent viscosity change value is shown in the formula (2).
ΔAV＝AV1-AV0....................................................(2)
In the formula: Δ AV-the value of the increase in apparent viscosity in units of millipascal-seconds (mPa · s); AV (Audio video)1-apparent viscosity after sample application in millipascal-seconds (mPa · s); AV (Audio video)0The apparent viscosity of the base slurry in units of millipascal-seconds (mpa · s).
(2) And (3) testing the lubrication coefficient: and (4) determining the extreme pressure lubrication coefficient of the liquid to be detected by using a Fann212 type extreme pressure lubrication instrument, and calculating the reduction rate of the lubrication coefficient. The liquid to be tested is 0.5 percent of lubricant and 99.5 percent of base slurry.
The reduction rate of the lubrication coefficient is (extreme pressure lubrication coefficient of base slurry-extreme pressure lubrication coefficient of base slurry containing lubricant)/extreme pressure lubrication coefficient of base slurry is 100%.
And after the reduction rate of the lubrication coefficient of the liquid to be tested is measured, replacing the base slurry containing 0.5% of the lubricant with the base slurry containing no lubricant, retesting the reduction rate of the extreme pressure lubrication of the slide block, and inspecting the directional adsorption lubrication effect of the lubricant on the metal surface.
The measured values of the examples and comparative examples are shown in table 1.
TABLE 1
| Sample name | △ρ(g/cm3) | ΔAV(mPa·s) | Reduction ratio of lubricity coefficient (%) | Rate of reduction of lubricating coefficient after replacement of slurry |
| Index (I) | ≤0.08 | ≤5 | ≥80 | -- |
| Base pulp | 0 | 0 | -- | -- |
| Lub-01 | 0.025 | 2.0 | 83 | 63 |
| Lub-02 | 0.015 | 2.5 | 86 | 65 |
| Lub-03 | 0.015 | 2.0 | 91 | 72 |
| Lub-04 | 0.020 | 2.0 | 85 | 64 |
| Lub-05 | 0.025 | 1.5 | 58 | 36 |
| Diesel oil | 0.010 | 1.5 | 30 | 10 |
| White oil | 0.015 | 2.0 | 35 | 8 |
As can be seen from Table 1, the density change value and the apparent viscosity change value of the base pulp by Lub-01-04 can be controlled within the index range, which shows that the lubricant has good compatibility with the base pulp, does not foam and has little influence on the viscosity of the base pulp; the reduction rate of the extreme pressure lubrication coefficient of Lub-01-04 is higher than the index value, which shows that the lubricant has a good lubricating effect, wherein the reduction rate of the extreme pressure lubrication coefficient of Lub-03 is obviously higher than the index value. Although the density change value and the apparent viscosity change value of the comparative example Lub-05, the diesel oil and the white oil are controlled within the index range, the difference between the extreme pressure lubrication reduction rate and the index value is large. After the blank base pulp without the lubricant is used for replacing the pulp, the extreme pressure lubrication reduction rate of the Lub-01-04 can reach more than 60%, wherein the extreme pressure lubrication reduction rate of the Lub-03 can still reach more than 70%; and the reduction rate of extreme pressure lubrication of the comparative example Lub-05, diesel oil and white oil is not more than 40%, which shows that the retention rate of the oily lubricant containing magnetic polyether on the metal surface is higher than that of the lubricant without magnetic material, and the magnetic lubricating product has a targeted adsorption effect on ferrous metal.
Test example 2:
a base slurry was prepared according to test example 1, and a lubricant was mixed with the base slurry in an amount of 0.5 wt% with stirring. Testing the friction coefficient of the base slurry containing the lubricant by using a constant Asahi SGW four-ball friction wear testing machine under the test conditions of 150N, the rotating speed of 100rmp, the test temperature of 25 ℃ and the time of 20 min; after the results were obtained, the base slurry containing the lubricant in the test cup was replaced with the base slurry containing no lubricant, the four-ball friction position was changed, and the friction coefficient was measured again, and the results are shown in table 2.
The effect of different lubricants on friction is shown in table 2.
TABLE 2 Effect of lubricants on coefficient of friction
As can be seen from Table 2, the friction coefficient of Lub-01-04 is obviously reduced, the friction coefficient is still kept low after slurry replacement, wherein two lubricants containing magnetic polyether, namely Lub-02 and Lub-03, can provide a better lubricating effect in the base slurry, and the friction coefficient can be kept low after slurry replacement, so that the lubricants have enhanced retention capacity on the friction surfaces and still have a stronger lubricating effect when the base slurry does not contain the lubricants.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The magnetic polyether for the water-based drilling fluid lubricant is characterized by being a magnetic nanoparticle modifier formed by graft copolymerization of hydroxylated magnetic nanoparticles, epoxypropane and epoxybutane.
2. The magnetic polyether for a water-based drilling fluid lubricant according to claim 1, wherein the magnetic polyether has a main chain structure represented by the following formula (1):
wherein is the surface of the magnetic nanoparticles; n is 5-12, m is 2-5; the molecular weight of the single magnetic polyether main chain is 700-2000.
3. The magnetic polyether for water-based drilling fluid lubricant as claimed in claims 1-2, wherein the hydroxylated magnetic nanoparticles are hydroxylatedFe (b) of3O4Any one or any two or more than two of Ni-Fe and cobalt oxide nano particles are mixed in any proportion; the average particle size of the hydroxylated magnetic nanoparticles is 10-50 nm.
4. The magnetic polyether for the water-based drilling fluid lubricant as claimed in claim 3, wherein the magnetic polyether comprises 5-20% of hydroxylated magnetic nanoparticles, 20-60% of propylene oxide segments and 10-20% of butylene oxide segments by mass fraction.
5. A process for preparing the magnetic polyether for a water-based drilling fluid lubricant according to any one of claims 1-4, comprising the steps of:
(1) respectively weighing hydroxylated nano magnetic particles and a liquid alkaline catalyst in a weight ratio of 5: 1-10: 1, fully mixing at room temperature, heating a reaction system to 70-90 ℃ under the protection of nitrogen with the purity of 99.99%, keeping the reaction temperature, respectively adding epoxy propane and epoxy butane into the reaction system, mechanically stirring at constant temperature for 12-24 hours, stopping stirring, naturally cooling to room temperature, and slowly adding methanol into the reaction system to terminate polyether chain segments with methyl groups to obtain a magnetic polyether crude product;
(2) and (3) decompressing the crude magnetic polyether product obtained in the step (1) to remove unreacted raw materials and methanol, adding concentrated hydrochloric acid to neutralize the pH value of the system to be neutral, washing with deionized water, standing, separating liquid to remove a water phase, and drying to obtain an oil-phase magnetic polyether product.
6. The method of claim 5, wherein the liquid alkaline catalyst used in step (1) is one or a mixture of two or more of monomethylamine, dimethylamine and trimethylamine in any ratio.
7. A water-based drilling fluid lubricant comprising an oil-based lubricating component and a magnetic polyether component, wherein the magnetic polyether component is the magnetic polyether of any one of claims 1-4 or the magnetic polyether prepared by the method of any one of claims 5-6.
8. Use of a magnetic polyether for a water-based drilling fluid lubricant according to any one of claims 1 to 4 or a magnetic polyether for a water-based drilling fluid lubricant prepared by a method according to any one of claims 5 to 6 in a water-based drilling fluid lubricant.
9. A drilling fluid comprising the water-based drilling fluid lubricant of claim 7.
10. Use of the drilling fluid of claim 9 in long open hole horizontal wells.
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| WO2022025949A1 (en) * | 2020-07-30 | 2022-02-03 | Saudi Arabian Oil Company | Epoxidized alpha olefin based anti-bit balling additive for water-based drilling fluids |
| CN116396491A (en) * | 2023-03-30 | 2023-07-07 | 任丘市鸿运石油化工有限公司 | Modified lubricant and preparation method and application thereof |
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| US20180223153A1 (en) * | 2017-02-03 | 2018-08-09 | Saudi Arabian Oil Company | Lubricants for water-based drilling fluids |
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| US11214724B1 (en) | 2020-07-30 | 2022-01-04 | Saudi Arabian Oil Company | Epoxidized alpha olefin based lubricant for water-based drilling fluids |
| WO2022025948A1 (en) * | 2020-07-30 | 2022-02-03 | Saudi Arabian Oil Company | Epoxidized alpha olefin based lubricant for water-based drilling fluids |
| WO2022025949A1 (en) * | 2020-07-30 | 2022-02-03 | Saudi Arabian Oil Company | Epoxidized alpha olefin based anti-bit balling additive for water-based drilling fluids |
| US11396620B2 (en) | 2020-07-30 | 2022-07-26 | Saudi Arabian Oil Company | Epoxidized alpha olefin based anti-bit balling additive for water-based drilling fluids |
| CN116396491A (en) * | 2023-03-30 | 2023-07-07 | 任丘市鸿运石油化工有限公司 | Modified lubricant and preparation method and application thereof |
| CN116396491B (en) * | 2023-03-30 | 2023-11-03 | 任丘市鸿运石油化工有限公司 | Modified lubricant and preparation method and application thereof |
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