CN110846003B - Weak magnetic targeting lubricant and water-based drilling fluid containing same - Google Patents

Weak magnetic targeting lubricant and water-based drilling fluid containing same Download PDF

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Publication number
CN110846003B
CN110846003B CN201911146824.9A CN201911146824A CN110846003B CN 110846003 B CN110846003 B CN 110846003B CN 201911146824 A CN201911146824 A CN 201911146824A CN 110846003 B CN110846003 B CN 110846003B
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parts
lubricant
magnetic
polyether
amorphous
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CN110846003A (en
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卢福伟
王静
虞舟
王凯佩
王越支
罗霄
赵世贵
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Jingzhou Xuecheng Industry Co ltd
Yangtze University
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Jingzhou Xuecheng Industry Co ltd
Yangtze University
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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
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers
    • 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
    • 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
    • C09K2208/02—Spotting, i.e. using additives for releasing a stuck drill
    • 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 weak magnetic targeting lubricant and a water-based drilling fluid containing the same, wherein the lubricant comprises 60-80 parts of base oil, 10-20 parts of polyester, 3-6 parts of surfactant and 3-10 parts of magnetic polyether; the magnetic polyether contains amorphous hydroxyl Fe3O4The nano particles are used as an initiator, and the lubricant is different from the traditional oily lubricant in that the lubricant can effectively reduce the surface adsorption probability of solid-phase particles in drilling fluid, most of the solid-phase particles are adsorbed on the surface of a drilling tool, the oil film strength and the hydrophobicity of the surface of the drilling tool are enhanced, the lubricating efficiency of the drilling tool in the long horizontal section of a horizontal well is improved, the torque and the friction resistance are reduced, and the water power transfer efficiency is improved.

Description

Weak magnetic targeting lubricant and water-based drilling fluid containing same
Technical Field
The invention relates to a weak magnetic targeting lubricant and a water-based drilling fluid containing the lubricant, belonging to the technical field of petroleum drilling.
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.
In the patent CN201711091999, a nonionic lubricant is synthesized by carrying out esterification reaction on C10-C18 mono-organic acid and alcohol, so that the interference of ionic components in the drilling fluid on the lubricating performance is effectively avoided.
In patent CN201810754751, alpha-olefin is used as an oily lubricating component, composite nano-silica is used as a high-performance lubricant, and the lubricant is added into drilling fluid, so that the lubricating property of the drilling fluid can be improved, and the friction resistance and torque in the drilling process can be reduced.
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 has the problems that the surface of the solid phase particles of the drilling fluid is preferentially adsorbed, the consumption speed of effective lubricating components is too high and the like in the competitive adsorption and film forming process of the solid phase particles of the drilling tool and the drilling fluid, and the long-horizontal-section continuous lubrication cannot be effectively solved. The lubricant capable of having lasting lubricating performance under high-difficulty complex working conditions is still in a blank state.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a weak magnetic targeting lubricant which can be preferentially adsorbed on the surface of a drilling tool, has good lubricating effect and strong loss resistance and energy consumption resistance, and can greatly reduce the problems of low power transfer efficiency of long horizontal section drilling water and the like.
The weak magnetic targeting lubricant comprises the following components in parts by weight: 60-80 parts of base oil, 10-20 parts of polyester, 3-6 parts of surfactant and 3-10 parts of magnetic polyether;
wherein the base oil is C18～C22Of vegetable oil or C18～C22Any one or mixture of any two or more of the fatty acid methyl esters in any proportion;
wherein the polyester is any one of trimethylolpropane oleate or pentaerythritol oleate or a mixture of two of trimethylolpropane oleate and pentaerythritol oleate in any proportion;
wherein the surfactant is span-80;
the magnetic polyether is prepared from the following raw materials in parts by weight: 300 parts of hydroxylated magnetic nanoparticle initiator 180-.
Preferably, the hydroxylated magnetic nanoparticle initiator is amorphous hydroxyl Fe3O4A nanoparticle;
preferably, the basic catalyst is potassium hydroxide;
preferably, the degree of polymerization of the polyether chain segment single chain of the magnetic polyether is 3-12, the length is moderate, and the foaming of impurities in span-80 in a water phase can be effectively inhibited.
Span-80 as a surfactant can be mutually soluble with base oil in any proportion; the span-80 can enable the base oil to form uniform emulsion drops in the water phase of the drilling fluid, so that the oil phase is more effectively adsorbed to a friction surface, and the lubricating effect of the oil phase lubricant is improved; trimethylolpropane oleate or pentaerythritol oleate can be effectively coupled with base oil and span-80 surfactant in the lubricant, so that the oil phase lubricant forms a uniform whole; the magnetic polyether is gray oily liquid at normal temperature and can be mutually dissolved with the base oil in any proportion; after the oil-phase lubricant is carried to the surface of the drilling tool by the magnetic polyether, the amide group of the span-80 can form chemical adsorption on the surface of the metal drilling tool, so that a stable oil film is strengthened, and the lubricating effect is improved.
As a specific embodiment, the invention provides that the amorphous hydroxyl Fe3O4A method for preparing nanoparticles, comprising the steps of:
1) FeCl is added2·4H2O、FeCl3·6H2Reacting O with a certain amount of NaOH solution at a certain temperature to generate a reaction product;
2) solid-liquid separation of the reaction product, washing the solid with deionized water and absolute ethyl alcohol to neutrality, stoving to obtain amorphous Fe hydroxide3O4And (3) nanoparticles.
Optionally, the reaction temperature is 30-40 ℃, and the reaction time is 1-4 hours;
controlling the reaction temperature not to exceed 50 ℃, and sacrificing the magnetism of part to ensure Fe3O4Hydroxyl content on the surface of the nanoparticlesThe surface of the particles can be grafted with propylene oxide or butylene oxide;
optionally, the reaction environment is an alkaline environment, and a certain amount of NaOH solution is added to adjust the pH value of the reaction kettle to 10-12; control of product amorphous hydroxyl Fe3O4The average particle size of the nano particles is between 20 and 40 nm.
In a preferred embodiment of the present invention, the amorphous Fe hydroxide3O4The preparation method of the nano-particles comprises the following steps:
1) firstly, 100-160 parts of FeCl2·4H2O, 20-30 parts of FeCl3·6H2Adding O into a reaction kettle, heating the materials in the reaction kettle to 30-40 ℃ under a stirring state, adjusting the pH value to 10-12 by using a NaOH solution, reacting until the color is gray to black, and stopping stirring to generate a reaction product;
2) the reaction product is dried for solid-liquid separation, the solid is respectively washed by deionized water and absolute ethyl alcohol until the pH value is 7, and the amorphous hydroxyl Fe is obtained after drying at the temperature of 40 DEG C3O4And (3) nanoparticles.
In another aspect of the present invention, a preparation method of the magnetic polyether is provided, which at least comprises the following steps: the magnetic polyether is prepared by reacting hydroxylated magnetic nano-particles serving as an initiator with propylene oxide and butylene oxide under the action of an alkaline catalyst.
Optionally, the reaction conditions are: the reaction temperature is 85-115 ℃, and the reaction time is 12-18 hours;
as a preferred embodiment of the present invention, the preparation method of the magnetic polyether comprises the following steps: 180-300 parts of amorphous hydroxyl Fe3O4Adding 2-30 parts of potassium hydroxide as a catalyst into a nanoparticle initiator, and adding 1800 parts of propylene oxide (300-) -and 1500 parts of butylene oxide (200-) -at the temperature of 85-115 ℃ under the protection of high-purity nitrogen to react for 12-18 hours to obtain the magnetic polyether.
The invention also aims to provide the water-based drilling fluid which can reduce the drilling resistance of a drilling tool in a long horizontal complex well section and effectively transfer water power;
the water-based drilling fluid comprises the following raw materials, by weight, 400 parts of clear water, 2-6 parts of bentonite, 0.4-0.8 part of NaOH, 0.3-0.8 part of tackifier, 0.5-4 parts of fluid loss additive, 0.5-1 part of coating agent, 1-4 parts of amine shale inhibitor, 1-3 parts of soda and 1-6 parts of weak magnetic targeting lubricant;
the weak magnetic targeting lubricant comprises the following components in parts by weight: 60-80 parts of base oil, 10-20 parts of polyester, 3-6 parts of surfactant and 3-10 parts of magnetic polyether; the raw materials are stirred in a stirring tank for 1-3 hours at normal temperature and normal pressure to form the weak magnetic targeting lubricant.
Compared with the prior art, the invention has the following beneficial effects: the mixture of the base oil and the polyester forms an oil film main body adsorbed on the surfaces of a drilling tool and a well wall; the magnetic polyether enables the whole oily lubricant to have magnetism in the oil phase, the lubricant is carried to the surface of the drilling tool, and the lubricant forms a firm oil film on the surface of the drilling tool by virtue of the magnetic adsorption effect; the weak magnetic targeting lubricant can provide enough lubrication at high temperature to reduce frictional resistance, and can effectively inhibit foaming of drilling fluid caused by impurities in synthetic oil and polyester; the weak magnetic targeting lubricant has strong adsorption capacity, and due to the magnetic adsorption effect, the continuous lubricating effect is 3-5 times that of the traditional oil lubricant under the condition of small addition amount, so that the torque and the resistance of a drilling tool during drilling in a long horizontal section can be effectively reduced; the lubricating reduction rate is obviously superior to that of the traditional lubricant, the influence on the rheological property of the drilling fluid is obviously less than that of the traditional lubricant, and the lubricating oil has obvious lubricating effect particularly in deep wells and long horizontal section shale gas wells; the lubricant forms a high-strength protective oil film on the surface of the drilling tool, so that the drilling tool can resist extreme temperature, pressure and weight, and can prevent erosion of foreign matters and damage caused by water, sand and other hard matters; the lubricant is non-toxic and harmless, and the magnetism only plays a role in targeted adsorption without interfering logging work.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
Example 1
The embodiment provides a weak magnetic targeting lubricant, which comprises 60 parts of rapeseed oil, 20 parts of trimethylolpropane oleate, 806 parts of span-4 parts of magnetic polyether, and the code of ML 01;
the preparation method of the magnetic polyether comprises the following steps:
1) 100 parts of FeCl2·4H2O, 20 parts of FeCl3·6H2Adding O into a reaction kettle, mixing and stirring at 30 ℃, dripping 0.1M NaOH solution into the reaction kettle until the pH value is 12, and stopping stirring after reacting for 1 hour to generate a reaction product;
2) the reaction product is dried for solid-liquid separation, the solid black particle precipitate is respectively washed to be neutral by deionized water and absolute ethyl alcohol, and is dried at 40 ℃ to obtain amorphous hydroxyl Fe3O4A nanoparticle;
3) adding 200 parts of amorphous state hydroxyl Fe obtained in the step 2) into a high-pressure reaction kettle3O4Adding 10 parts of potassium hydroxide into the nano particles, and introducing N with the purity of 99.99 percent2And under the stirring state, introducing 1000 parts of propylene oxide and 200 parts of butylene oxide through a pipeline, heating the materials in the reaction kettle to 85 ℃ for reaction for 12 hours, and reacting to light gray transparent oily substances to obtain the magnetic polyether.
Example 2
The embodiment provides a weak magnetic targeting lubricant comprising C1860 parts of fatty acid methyl ester, 20 parts of pentaerythritol oleate, 5 parts of span-805 and 5 parts of magnetic polyether, wherein the code is ML 02;
the preparation method of the magnetic polyether comprises the following steps:
1) 100 parts of FeCl2·4H2O, 25 parts of FeCl3·6H2Adding O into a reaction kettle, mixing and stirring at 40 ℃, dripping 0.1M NaOH solution into the reaction kettle until the pH value is 10, and reacting for 1 hour to generate a reaction product;
2) the reaction product is dried for solid-liquid separation, the solid black particle precipitate is respectively washed to be neutral by deionized water and absolute ethyl alcohol, and is dried at 40 ℃ to obtain amorphous hydroxyl Fe3O4A nanoparticle;
3) adding 180 parts of the amorphous hydroxyl obtained in the step 2) into a high-pressure reaction kettleRadical Fe3O4Adding 9 parts of potassium hydroxide into the nano particles, and introducing N with the purity of 99.99 percent2And under the stirring state, introducing 1200 parts of propylene oxide and 200 parts of butylene oxide through a pipeline, heating the materials in the reaction kettle to 100 ℃ for reaction for 14 hours, and reacting to light gray transparent oily substances to obtain the magnetic polyether.
Example 3
The embodiment provides a weak magnetic targeting lubricant, which comprises 70 parts of cottonseed oil, 15 parts of pentaerythritol oleate, 15 parts of span-8010 and 7 parts of magnetic polyether, wherein the code is ML 03;
the preparation method of the magnetic polyether comprises the following steps:
1) 100 parts of FeCl2·4H2O, 30 parts of FeCl3·6H2Adding O into a reaction kettle, mixing and stirring at 40 ℃, dripping 0.1M NaOH solution into the reaction kettle until the pH value is 10, and reacting for 1 hour to generate a reaction product;
2) the reaction product is dried for solid-liquid separation, the solid black particle precipitate is respectively washed to be neutral by deionized water and absolute ethyl alcohol, and is dried at 40 ℃ to obtain amorphous hydroxyl Fe3O4A nanoparticle;
3) adding 250 parts of amorphous state hydroxyl Fe obtained in the step 2) into a high-pressure reaction kettle3O4Adding 11 parts of potassium hydroxide into the nano particles, and introducing N with the purity of 99.99 percent2And under the stirring state, 1500 parts of propylene oxide and 300 parts of butylene oxide are introduced through a pipeline, the materials in the reaction kettle are heated to 110 ℃ for reaction for 18 hours, and the reaction is carried out until light gray transparent oily substances are obtained.
Comparative example:
commercially available water-based drilling fluid lubricants KD-21C and KD-51 (samples taken from 8-2X well construction sites in the Zhongpetrochemical Jiangsu oil district).
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.
And (3) carrying out lubrication coefficient measurement on the base slurry and the base slurry containing the lubricant: 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.
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 wt% of lubricant and 99.5 wt% 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 Lubricant extreme pressure lubrication reduction test
Serial number Reduction rate of extreme pressure lubrication coefficient% Percentage reduction of extreme pressure lubrication coefficient after replacement of slurry
ML01 95 82
ML02 95 83
ML03 97 85
KD-21C 91.1 45
KD-51 92 20
As can be seen from the table 1, the three weak magnetic targeting lubricants prepared in the embodiments 1 to 3 of the invention have higher lubricating effect before washing than that of the traditional lubricant KD-21C, KD-51, but have little difference, and have the same lubricating action principle, that is, the surfactant emulsifies and disperses the lubricant in the water phase drilling fluid, and oil drops are transferred to the friction surface to form oil film lubrication; after the friction surface is washed by the base slurry, the lubricating effect of KD-21C, KD-51 is reduced rapidly because the quantity of the lubricant on the friction surface is reduced as the oil film adsorbed on the friction surface is transferred into the base slurry by washing. Adding oil-soluble magnetic lubricating component nano Fe3O4After the polyether is adopted, the adsorption capacity of an oil film on a friction surface is obviously enhanced, the reduction rate of extreme pressure lubrication after washing is still kept above 80%, and the lubricating effect of the oil lubricant can be obviously improved.
Test example 2:
the weak magnetic targeting lubricant in the embodiment of the invention is evaluated for the continuous wear resistance and wear reduction effect, the basic slurry preparation method refers to the embodiment 1, the continuous wear resistance experiment adopts an MMW-1 type vertical universal friction wear testing machine, a steel ball with the diameter of 6.3mm, and a steel disc with the diameter of 48mm to test the change rule of the friction coefficient along with the time and the wear rate under the condition of soaking the drilling fluid. The test conditions were: load 100N, temperature 120 ℃ and rotation speed 350 rpm.
The wear rate is calculated as shown in equation (1).
I＝ΔM/(ρ×F×D) (1)
In the formula (1), I is the wear rate in mm3V (N · m); delta M is the steel plate mass change value g; rho is the density of the steel disc, g/cm3(ii) a F is the load, N; d is the sliding friction distance, m.
The effect of different lubricants on wear is shown in table 2.
TABLE 2 Effect of lubricants on coefficient of friction and wear rate
Figure BDA0002282431200000061
Figure BDA0002282431200000071
As can be seen from table 2, the base slurry to which the lubricant was added had a significant lubricating effect as compared with the original base slurry; the friction coefficient of a traditional lubricant KD-21C, KD-51 in a stable period is between 0.06 and 0.08, and the anti-wear time is less than 2300s, while the friction coefficients of three weak magnetic targeting lubricants in the embodiments 1 to 3 of the invention in the stable period are less than 0.05, and the anti-wear time is more than 3600s, which is obviously better than KD-21C, KD-51; and the wear rate of the three weak magnetic targeting lubricants in examples 1 to 3 is lower than 5.5 multiplied by 10-13mm3And (N.m) has a long-acting lubricating effect and high loss resistance and energy consumption, so that the weak magnetic targeting lubricant provided by the invention has an obvious lubricating effect compared with a common oil lubricant.
Test example 3:
preparing a drilling fluid system:
adding 2 wt% of bentonite (meeting the requirement of GB 5005-2010) and 2 wt% of Na into 300 parts by weight of water while stirring at intervals of 10 minutes2CO3(analytically pure), 0.5 wt% of NaOH (analytically pure), 0.4 wt% of tackifier (HE 150 type tackifier from Chevrolet Philippines chemical engineering (China)), 3 wt% of fluid loss additive (Dristemp type fluid loss additive from Chevrolet Philippines chemical engineering (China)), 0.6 wt% of coating agent (polyacrylamide potassium salt KPAM coating agent from quintuplet chemical plant of Jiangxi Pingxiang), 1 wt% of amine shale inhibitor (Ultrahib type shale inhibitor from Pasteur oilfield chemical department), and 1 wt% of lubricant, wherein after being uniformly stirred, the lubricant is weighted to a drill by bariteThe density of the well fluid is 2.0g/cm3。
And the drilling fluid system described above without added lubricant as a blank control.
(1) And (3) viscosity testing: and measuring and calculating the viscosity, the dynamic shear force, the dynamic-plastic ratio and the like of the drilling fluid system before aging and after aging for 16 hours at 150 ℃ by using an electric six-speed viscometer (ZNN-D6B).
Wherein: apparent viscosity AV 0.5Nφ600(ii) a Plastic viscosity PV ═ Nφ600-Nφ300(ii) a Dynamic shear force YP is 0.511 (N)φ300-PV); dynamic plastic ratio YP/PV.
(2) And (3) testing the filtration loss: measuring the filtration loss of the drilling fluid system before aging and after aging for 16 hours at 150 ℃ by using a six-unit API water loss instrument and a high-temperature high-pressure water loss instrument; the results are shown in Table 3.
TABLE 3
Figure BDA0002282431200000072
Figure BDA0002282431200000081
The data in table 3 show that the weak magnetic targeting lubricant has a good viscosity reduction effect, improves the rheological property of a drilling fluid system, and reduces the fluid loss of the system.
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 weak magnetic targeting lubricant is characterized by comprising the following raw material components in parts by weight:
base oil: 60 to 80 portions of,
Polyester: 10 to 20 parts of,
Surfactant (b): 3 to 6 parts of,
Magnetic polyether: 3-10 parts.
2. The weak magnetic targeting lubricant as claimed in claim 1, wherein the base oil is C18～C22Of vegetable oil or C18～C22Any one or a mixture of any two or more of the fatty acid methyl esters in any proportion;
the polyester is any one or a mixture of two of trimethylolpropane oleate or pentaerythritol oleate in any proportion;
the surfactant is span-80.
3. The weak magnetic targeting lubricant as claimed in claim 1, wherein the magnetic polyether is prepared from the following raw materials in parts by weight:
hydroxylated magnetic nanoparticle initiator: 180 portions of 300 portions,
Basic catalyst: 2-30 parts of,
Propylene oxide: 300 portions of 1800 portions,
Butylene oxide: 200-1500 parts.
4. The weakly magnetic targeting lubricant according to claim 3 wherein the hydroxylated magnetic nanoparticle initiator is amorphous hydroxyFe3O4A nanoparticle;
the alkaline catalyst is potassium hydroxide.
5. The weak magnetic targeting lubricant of claim 4 wherein said amorphous hydroxyl Fe3O4The average particle size of the nanoparticles is 20-40 nm, and the polymerization degree of a polyether chain segment single chain of the magnetic polyether is 3-12.
6. The preparation method of the magnetic polyether is characterized by at least comprising the following steps: the magnetic polyether is prepared by reacting hydroxylated magnetic nano-particles serving as an initiator with propylene oxide and butylene oxide under the action of an alkaline catalyst.
7. The method for preparing magnetic polyether in claim 6, wherein 180-300 parts of amorphous Fe hydroxide3O4Adding 2-30 parts of potassium hydroxide as a catalyst into a nanoparticle initiator, and adding 1800 parts of propylene oxide (300-) -and 1500 parts of butylene oxide (200-) -at the temperature of 85-115 ℃ under the protection of high-purity nitrogen to react for 12-18 hours to obtain the magnetic polyether.
8. The method of claim 7, wherein the amorphous hydroxy group is Fe3O4The nanoparticle initiator is prepared by the following steps:
1) FeCl is added2∙4H2O、FeCl3∙6H2Reacting O and NaOH solution at a certain temperature to generate a reaction product;
2) solid-liquid separation of the reaction product, washing the solid with deionized water and absolute ethyl alcohol to neutrality, stoving to obtain amorphous Fe hydroxide3O4And (3) nanoparticles.
9. The method for preparing magnetic polyether according to claim 8,
1) firstly, 100-160 parts of FeCl2∙4H2O, 20-30 parts of FeCl3∙6H2Adding O into a reaction kettle, heating the materials in the reaction kettle to 30-40 ℃ under a stirring state, adjusting the pH value to 10-12 by using a NaOH solution, reacting for 1-4 hours until the color is gray to black, and stopping stirring to generate a reaction product;
2) the reaction product is dried for solid-liquid separation, the solid is respectively washed by deionized water and absolute ethyl alcohol until the pH value is 7, and the amorphous hydroxyl Fe is obtained after drying at the temperature of 40 DEG C3O4And (3) nanoparticles.
10. The water-based drilling fluid is characterized by comprising the following raw materials, by weight, 400 parts of clear water, 2-6 parts of bentonite, 0.4-0.8 part of NaOH, 0.3-0.8 part of tackifier, 0.5-4 parts of fluid loss additive, 0.5-1 part of coating agent, 1-4 parts of amine shale inhibitor, 1-3 parts of soda ash and 1-6 parts of lubricant;
wherein the lubricant is the weak magnetic targeting lubricant as claimed in any one of claims 1 to 5.
CN201911146824.9A 2019-11-21 2019-11-21 Weak magnetic targeting lubricant and water-based drilling fluid containing same Active CN110846003B (en)

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Title
共沉淀制备不同粒径Fe_3O_4纳米颗粒及磁性能的研究;邵晓萍等;《功能材料》;20110120;第42卷(第01期);178-181 *
基于正交法的磁性Fe_3O_4纳米颗粒制备工艺选择;崔红超等;《北京交通大学学报》;20110615;第35卷(第03期);7-10 *

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