CN114381246B - High-temperature-resistant modified hexagonal boron nitride nano plugging agent and water-based drilling fluid - Google Patents
High-temperature-resistant modified hexagonal boron nitride nano plugging agent and water-based drilling fluid Download PDFInfo
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Abstract
A high-temperature-resistant modified hexagonal boron nitride nano plugging agent and a water-based drilling fluid belong to the technical field of oil and gas field drilling, and the high-temperature-resistant modified hexagonal boron nitride nano plugging agent takes nano hexagonal boron nitride (80-100 nm), an amino-containing silane coupling agent, a dialkene alcohol compound, a diprimary amine compound and an ethylenic bond-containing sulfonic acid compound as raw materials. The blocking agent prepared from the high-temperature-resistant modified hexagonal boron nitride has the particle size of 150-380nm, the blocking performance is remarkably improved compared with that of the blocking agent of the same type, the external sulfonic acid group has stronger salt resistance besides the blocking performance, the blocking agent can be directly added into a water-based drilling fluid, the compatibility is good, the well wall can be effectively stabilized, and the blocking agent can be applied to deep wells and ultra-deep wells. The plugging agent also has the advantages of easily obtained raw materials, low price and the like, and the provided synthetic method is stable and reliable and is suitable for industrial production.
Description
Technical Field
The invention relates to the technical field of oil and gas field drilling, in particular to a high-temperature-resistant modified hexagonal boron nitride nano plugging agent and a water-based drilling fluid.
Background
At present, in domestic and foreign well drilling, the problem of unstable well walls often exists, and statistics of hundreds of wells at home and abroad shows that the drilled shale stratum accounts for 70% of the total drilled stratum, and more than 90% of well collapse occurs in the shale stratum. The shale has a special micro-nano pore gap structure, belongs to an ultra-low pore and low permeability type, and is mostly a nano-scale pore throat. Aiming at the reservoir forming characteristics of shale gas, horizontal well drilling becomes a main drilling mode for shale gas development. No matter the water-based drilling fluid system or the oil-based drilling fluid system is used for drilling the shale stratum, the phenomenon of well wall collapse can occur, the fundamental reason is the hydraulic fracture effect, the drilling fluid or the filtrate enters the fracture to open the fracture, and meanwhile, the friction force between the fracture surfaces is greatly reduced, and the collapse pressure is greatly increased. If the crack cannot be effectively blocked and the slurry liquid phase is blocked from entering the crack, the collapse cannot be prevented.
The particle size of the sulfonated asphalt or emulsified asphalt commonly used in the drilling fluid is mostly in the micron level, and the sulfonated asphalt or emulsified asphalt can effectively plug micro cracks in the micron level, but for cracks with the size generally between nanometer and micron, the particle size and the shape of the sulfonated asphalt or emulsified asphalt are not matched with the nanometer pores of shale, the particles can only deposit on the surfaces of the cracks, and are easily washed by the drilling fluid, and the particles are damaged by the collision of a drilling tool, and the good plugging effect cannot be achieved. Therefore, effective plugging of the nano-pore gaps which are easy to cause borehole wall instability is the key point for keeping borehole wall stability and is a difficult point which is urgently needed to be solved in drilling engineering.
Disclosure of Invention
Aiming at the problem of borehole wall instability caused by the fact that the conventional plugging agent cannot effectively plug nano cracks in the shale at present, the invention provides the high-temperature-resistant modified hexagonal boron nitride nano plugging agent, the particle size of which is nano, and the high-temperature-resistant modified hexagonal boron nitride nano plugging agent can effectively plug nano cracks in a shale stratum, so that the aim of stabilizing the borehole wall is fulfilled. And the novel nano plugging water-based drilling fluid which can be suitable for shale strata is developed by combining with the high-temperature resistant modified hexagonal boron nitride nano plugging agent to replace an oil-based drilling fluid, so that the problems of well wall stability, reservoir pollution and the like can be solved.
In order to achieve the purpose, the technical scheme of the invention is as follows: the high-temperature-resistant modified hexagonal boron nitride nano plugging agent is prepared by mixing modified nano hexagonal boron nitride and water. The high-temperature-resistant modified hexagonal boron nitride nano plugging agent is synthesized by taking nano hexagonal boron nitride (80-100 nm), an amino-containing silane coupling agent, a dialkenol compound, a diprimary amine compound and an ethylenic bond-containing sulfonic acid compound as raw materials through the following steps:
s1, adding 0.5-0.7mol of nano hexagonal boron nitride into 100mL of 5mol/L sodium hydroxide solution, heating to 90-100 ℃, stirring to disperse, introducing nitrogen for 12h, washing the obtained mixture for multiple times until the filtrate is neutral, drying to obtain surface hydroxylated hexagonal boron nitride, adding 0.5-0.6mol of hydroxylated hexagonal boron nitride into 120mL of toluene solution, heating to 80-90 ℃, adding 0.1-0.3mol of amino-containing silane coupling agent while stirring, reacting the hydroxylated hexagonal boron nitride with the amino-containing silane coupling agent for 5h, distilling under reduced pressure for 2h to obtain a crude product, washing with toluene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain modified nano hexagonal boron nitride;
s2, dispersing the modified hexagonal boron nitride prepared in the S1 by using 100-110mL of methylbenzene, adding 0.25-0.3mol of dialkene alcohol compound, reacting for 24h at 60-70 ℃, distilling under reduced pressure for 2h, washing by using methylbenzene, filtering, removing unreacted monomers, drying under vacuum for 2h, adding 0.25-0.3mol of dried product into 100-110mL of methylbenzene, stirring until the product is dispersed, keeping introducing nitrogen for 20-30min, slowly adding 0.25-0.3mol of diamine compound, heating to 10 ℃, reacting for 48h, distilling under reduced pressure, washing by using methylbenzene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain a compound with a terminal functional group of amine;
and S3, dispersing the compound with the amine as the terminal functional group prepared in the S2 by using 100-110mL of toluene, adding 0.25-0.3mol of sulfonic acid compound containing an olefinic bond, reacting at 65-70 ℃ for 48h, distilling under reduced pressure for 2h, washing by using toluene, filtering, removing unreacted monomers, drying in vacuum for 2h, and grinding a dried sample to obtain the modified hexagonal boron nitride polymer (150-380 nm).
The amino-containing silane coupling agent is one of 3-aminopropyltriethoxysilane (KH 550) and 3-aminopropyltrimethoxysilane (KH 540).
The amino-containing silane coupling agent is one of gamma-aminopropyltrimethoxysilane (KH 540), 3-0 aminopropyltriethoxysilane (KH 550) and N-2-aminoethyl-3-aminopropyltrimethoxysilane (KH-792).
The blocking agent is characterized in that the dialkene alcohol compound is 1,4-pentadiene-3-ol or one of 1,5-hexadiene-3,4-diol.
The blocking agent is characterized in that the diamine compound is one of ethylenediamine, 1,2-propanediamine, 1,4-butanediamine and 1,5-pentanediamine.
The blocking agent is characterized in that the ethylenic bond-containing sulfonic acid compound is one of vinyl sulfonic acid, 2-methyl-2-acrylic acid-2-sulfoethyl ester and 2-acrylamide-2-methylpropanesulfonic acid.
The drilling fluid is added with the high-temperature-resistant modified hexagonal boron nitride nano plugging agent as claimed in any one of claims 1 to 6.
The invention also aims to provide a water-based drilling fluid, which is added with the high-temperature-resistant modified hexagonal boron nitride nano plugging agent.
The water-based drilling fluid is characterized in that the addition of the bentonite is 2-4 parts by weight based on 100 parts by weight of water, and the anhydrous NaCO is 3 The addition amount of the anti-seize lubricant (FK-10) is 0.3-0.5 part by weight, the addition amount of the NaOH is 0.1-0.3 part by weight, the addition amount of the coating agent (KPAM) is 0.01-0.03 part by weight, the addition amount of the fluid loss additive (SMP-1) is 5-6 parts by weight, the addition amount of the anti-sloughing agent (FRH) is 3-5 parts by weight, the addition amount of the anti-seize lubricant (FK-10) is 4-5 parts by weight, the addition amount of the CaO is 0.3-0.5 part by weight, the addition amount of the blocking agent (high temperature modified hexagonal boron nitride nano blocking agent) is 1-5 parts by weight, the addition amount of the shear promoter (NH-1) is 1-2 parts by weight, and the addition amount of the weighting agent (nano barite) is 0-220 parts by weight.
The invention has the following beneficial effects:
1. the synthesis method is simple, and the compound needed by synthesis is low in price and easy to produce.
2. The shale plugging agent provided by the invention has stable performance and strong adaptability, has good salt resistance besides high temperature resistance and excellent plugging performance, and can meet the drilling requirements of various complex well conditions.
3. The shale plugging agent provided by the invention has the particle size of 150-380nm, can plug nano-pores in a shale stratum, is not easy to agglomerate, can keep good dispersibility, and has excellent plugging rate performance.
Drawings
FIG. 1 is a particle size distribution diagram of a high temperature resistant modified hexagonal boron nitride nano plugging agent in example one;
FIG. 2 is a particle size distribution diagram of the high temperature resistant modified hexagonal boron nitride nano plugging agent in example two.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 the present examples, the parts are all parts by weight unless otherwise specified.
1. Synthesizing the high-temperature-resistant modified hexagonal boron nitride nano plugging agent:
example 1:
(1) Modification of hexagonal boron nitride
Adding 0.5mol of nano hexagonal boron nitride into 100mL of 5mol/L sodium hydroxide solution, heating to 90 ℃, stirring to disperse, introducing nitrogen for 12h, washing the obtained mixture for multiple times until the filtrate is neutral, drying to obtain surface hydroxylated hexagonal boron nitride, adding 0.5mol of hydroxylated hexagonal boron nitride into 120mL of toluene solution, heating to 80 ℃, adding 0.1mol of gamma-aminopropyltrimethoxysilane (KH 540) while stirring, reacting the hydroxylated hexagonal boron nitride with the gamma-aminopropyltrimethoxysilane (KH 540) for 5h, distilling under reduced pressure for 2h to obtain a crude product, washing with toluene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain the modified nano hexagonal boron nitride.
(2) Synthesis of hexagonal boron nitride grafted amino compound
Dispersing the modified hexagonal boron nitride prepared in the step (1) by using 100mL of methylbenzene, adding 0.25mol of 1, 4-pentadiene-3-alcohol, reacting for 24 hours at 60 ℃, distilling under reduced pressure for 2 hours, washing by using methylbenzene, filtering, removing unreacted monomers, drying under vacuum for 2 hours, adding 0.25-0.3mol of dried products into 100mL of methylbenzene, stirring until the mixture is dispersed, keeping introducing nitrogen for 20 minutes, slowly adding 0.25mol of ethylenediamine, heating to 10 ℃, reacting for 48 hours, distilling under reduced pressure, washing by using methylbenzene, filtering, removing the unreacted monomers, and drying under vacuum for 2 hours to obtain the compound of which the terminal functional group is amine.
(3) Synthesis of hexagonal boron nitride grafted sulfonic compound
And (3) dispersing the compound with the amine as the terminal functional group prepared in the step (2) by using 100mL of toluene, adding 0.25mol of vinyl sulfonic acid, reacting for 48h at 65 ℃, distilling under reduced pressure for 2h, washing with toluene, filtering, removing unreacted monomers, drying in vacuum for 2h, and grinding a dried sample to obtain the modified hexagonal boron nitride polymer.
Example 2:
(1) Modification of hexagonal boron nitride
Adding 0.5mol of nano hexagonal boron nitride into 100mL of 5mol/L sodium hydroxide solution, heating to 90 ℃, stirring until the mixture is dispersed, introducing nitrogen for 12h, washing the obtained mixture for multiple times until the filtrate is neutral, drying to obtain surface hydroxylated hexagonal boron nitride, adding 0.5mol of hydroxylated hexagonal boron nitride into 120mL of toluene solution, heating to 80 ℃, adding 0.1mol of 3-0 aminopropyltriethoxysilane (KH 550) while stirring, reacting the hydroxylated hexagonal boron nitride with 3-0 aminopropyltriethoxysilane (KH 550) for 5h, distilling under reduced pressure for 2h to obtain a crude product, washing with toluene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain the modified nano hexagonal boron nitride.
(2) Synthesis of hexagonal boron nitride grafted amino compound
Dispersing the modified hexagonal boron nitride prepared in the step (1) by using 100mL of toluene, adding 0.25mol of 1, 5-hexadiene-3,4-diol, reacting for 24h at 60 ℃, distilling under reduced pressure for 2h, washing by using toluene, filtering, removing unreacted monomers, drying under vacuum for 2h, adding 0.25-0.3mol of dried product into 100mL of toluene, stirring until the product is dispersed, keeping introducing nitrogen for 20min, slowly adding 0.25mol of 1, 2-propanediamine, heating to 10 ℃, reacting for 48h, distilling under reduced pressure, washing by using toluene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain the compound of which the terminal functional group can be amine.
(3) Synthesis of hexagonal boron nitride grafted sulfonic compound
And (3) dispersing the compound with the amine as the terminal functional group prepared in the step (2) by using 100mL of toluene, adding 0.25mol of 2-methyl-2-acrylic acid-2-sulfoethyl ester, reacting for 48h at 65 ℃, distilling under reduced pressure for 2h, washing by using toluene, filtering, removing unreacted monomers, drying for 2h in vacuum, and grinding a dried sample to obtain the modified hexagonal boron nitride polymer.
To further illustrate the effect of the environmentally friendly blocking agent of the present invention, the blocking agents of examples 1 and 2 were tested for their performance.
2. Performance test
1. Particle size test of high-temperature-resistant modified hexagonal boron nitride nano plugging agent
Particle size tests of the high temperature resistant modified hexagonal boron nitride nano plugging agent were performed by using a BI-200SM laser scattering instrument manufactured by brueck hein instruments, and the results of the particle size tests of the high temperature resistant modified hexagonal boron nitride nano plugging agent prepared in the four examples are shown in fig. 1 and fig. 2, respectively. The particle size range of the high-temperature-resistant modified hexagonal boron nitride nano plugging agent is 150-380nm, and the high-temperature-resistant modified hexagonal boron nitride nano plugging agent can be used for nano plugging.
2. Drilling fluid rheological property and water loss wall-building property test
The invention is mainly illustrated by the following specific formula of application mode of the hexagonal boron nitride nano plugging agent for resisting high temperature modification. Based on 100 parts by weight of fresh water, the formulation of the water-based drilling fluid is described in the following manner, and the specific formulation of the water-based drilling fluid is as follows: 100 parts by weight of water, 3 parts by weight of bentonite and 0.3 part by weight of anhydrous NaCO 3 +0.2 part by weight of NaOH +0.02 part by weight of coating agent (KPAM) +5 parts by weight of fluid loss additive (SMP-1) +5 parts by weight of anti-collapse agent (FRH) +4 parts by weight of anti-seize lubricant (FK-10) +0.4 part by weight of CaO +1-5 parts by weight of high temperature resistant modified hexagonal boron nitride nano plugging agent +1 part by weight of shear promoter (NH-1) +46 parts by weight of weighting agent (nano-barite).
The concrete preparation process is as follows
(1) Prehydrated bentonite slurry
Adding 45 parts by weight of bentonite into 1500 parts by weight of tap water with the temperature of 70 ℃, stirring uniformly at room temperature, and adding 4.5 parts by weight of anhydrous NaCO 3 After fully stirring for 30min, sealing, standing and hydrating for 24h.
(2) Preparation of drilling fluid
Respectively taking 5 parts of 300mL of prehydrated bentonite slurry, sequentially adding 0.06 part of coating agent (KPAM), 0.6 part of anhydrous NaOH,15 parts of fluid loss additive (SMP-1), 15 parts of anti-collapse agent (FRH), 12 parts of anti-seize lubricant (FK-10), 1.2 parts of CaO and 3 parts of cutting agent (NH-1), and adjusting the density to 1.46g/cm by using weighting agent (nano-barite) 3 . Each time one substance is added, stirring is needed for 10-15 min.
After uniform stirring, one part of drilling fluid without the modified titanium dioxide nano plugging agent is taken as drilling fluid base slurry, and 3 parts by weight, 6 parts by weight, 9 parts by weight and 12 parts by weight of the plugging agent of the example 1 prepared in the above manner are added into the remaining 4 parts of drilling fluid, so that four kinds of drilling fluids with different addition amounts of the example 1 are prepared.
According to the standard GB/T16783.1-2014 part 1 of the field test of the drilling fluid in the oil and gas industry: the water-based drilling fluid, the rheological property and the water loss wall-building property of the drilling fluid prepared in the steps are respectively tested before and after aging, and the results are recorded in Table 1.
From the results shown in table 1, it can be seen that, compared with the drilling fluid without the drilling fluid of example 1 and example 2, when the drilling fluid is added in an amount of 3 to 12 parts by weight in example 1 and example 2, the performance of the drilling fluid is not significantly affected, indicating that the drilling fluid plugging agent has good compatibility. With the increase of the addition amount of the embodiment 1 and the embodiment 2, the apparent viscosity and the plastic viscosity of the drilling fluid are gradually increased under the same experimental condition, and the influence on the shearing force is small. With the increase of the addition of the embodiment 1 and the embodiment 2, the normal temperature and pressure filtration loss and the high temperature and pressure filtration loss are gradually reduced, and the high temperature and pressure filtration loss is minimum when the addition is 12 parts by weight, which shows that the embodiment 1 and the embodiment 2 have good rheological property and water loss wall-building property, can effectively reduce the high temperature and pressure filtration loss of the drilling fluid, can provide good plugging property even in a high temperature environment, effectively prevent the filtrate from entering the stratum and improve the stability of the well wall.
TABLE 1 drilling fluid rheological Properties and fluid loss Properties Table
AV-apparent viscosity, unit is mPas; PV-plastic viscosity, unit is mPas; YP-dynamic shear force, in Pa; API-filtration loss at normal temperature and medium pressure, the unit is mL; HTHP-high temperature and high pressure fluid loss in mL.
3. Drilling fluid plugging performance test
The mud cake with certain size, thickness and permeability is prepared by using the drilling fluid system and a GGS-71 type high-temperature high-pressure filtration loss instrument and is used as a simulated stratum of a micro-fractured stratum, 0-5% of high-temperature-resistant modified hexagonal boron nitride nano plugging agent is added to carry out a high-temperature high-pressure filtration loss experiment to simulate the high-temperature high-pressure water loss amount of the plugging agent in the stratum, the permeability of the plugging agent is calculated by using the water loss amount to evaluate the plugging effect of the plugging agent in the drilling fluid system, and the smaller the high-temperature high-pressure filtration loss amount is under the condition that other factors are the same, the smaller the permeability of the drilling fluid in the stratum is, the more difficult the drilling fluid is to be immersed in the stratum, and the better the plugging effect is.
(1) Preparation of the Filter cake
(1) Preparing soil slurry, putting 3300mL of purified water with the temperature of 70 ℃ into a container, adding 198 parts by weight of bentonite by using a stirrer at the rotation speed of 1000r/min while stirring, then adding 9.9 parts by weight of anhydrous sodium carbonate, stirring at the rotation speed of 800r/min for 3 hours, and then taking out the solution for prehydration for 24 hours.
(2) 3300mL of 6% slurry was taken out of a vessel, and 0.66 part by weight of a coating agent (KPAM), 165 parts by weight of a fluid loss additive (SMP-1), 165 parts by weight of an anti-collapse agent (FRH), 132 parts by weight of an anti-seize lubricant (FK-10), 13.2 parts by weight of CaO,33 parts by weight of a shear strength agent (NH-1), and 1320 parts by weight of a weighting agent (nano-barite) were sequentially added thereto, stirred in a stirrer rotating at 1400r/min for 3 hours, and then added to a hot roller at 150 ℃ for aging for 16 hours.
(3) And (3) draining the aged drilling fluid in the step (2) by using a glass rod, slowly pouring the drilling fluid into a high-temperature high-pressure fluid loss filter, filtering for 30min under the conditions that the temperature is 150 ℃ and the pressure is 3.5MPa, then taking out the precipitate in the high-temperature high-pressure fluid loss filter, and washing out a mud cake in clear water at the temperature of 50 ℃.
(2) Evaluation of plugging Properties
Preparing filter cakes according to the method, selecting filter cakes with approximately same permeability, preparing drilling fluid base slurry and different addition amounts of the example 1 and the example 2 into 300mL solutions with different concentration gradients, performing ultrasonic dispersion for 10min, transferring the solutions into a high-temperature and high-pressure water loss instrument filled with the filter cakes, sequentially testing the solutions under the same conditions of 150 ℃ and 3.5MPa, recording the reading every 5min, measuring for 30min, taking out mud cakes, and calculating the permeability of the example 1 and the example 2 with different addition amounts according to a formula after drying by a blower, wherein the results are shown in Table 2.
From the data in table 2, it can be seen that the plugging performance of example 1 and example 2 is excellent, the average water loss and the mud cake permeability calculated by the high-temperature high-pressure water loss test of the mud cake of example 1 and example 2 are much smaller than those of clear water in the mud cake, and the plugging effect is better with the increase of the addition of example 1 and example 2, the maximum plugging rate can reach 92.39% with the increase of the addition of example 1, and the maximum plugging rate can reach 92.52% with the increase of the addition of example 2. The plugging agent of the invention can plug the nano-pore gaps.
Table 2 evaluation of plugging effect at different addition amounts of example 1 and example 2
In conclusion, the preparation method of the high-temperature-resistant modified hexagonal boron nitride nano plugging agent is stable and reliable, the synthetic product is low in price, and the prepared polymer plugging agent is good in plugging property, rheological property, water solubility, dispersibility and adsorbability, greatly improved compared with similar products, and excellent in well wall stabilizing effect. The plugging agent can achieve excellent plugging effect only by a small amount, and is an effective way for solving the problems of well wall stability and drilling fluid loss.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The high-temperature-resistant modified hexagonal boron nitride nano plugging agent is characterized in that the high-temperature-resistant modified hexagonal boron nitride nano plugging agent is synthesized by the following raw materials of nano hexagonal boron nitride with the particle size of 80-100nm, an amino-containing silane coupling agent, a dialkene alcohol compound, a diprimary amine compound and an ethylenic bond-containing sulfonic acid compound through the following steps:
s1, adding 0.5-0.7mol of nano hexagonal boron nitride into 100mL of 5mol/L sodium hydroxide solution, heating to 90-100 ℃, stirring to disperse, introducing nitrogen for 12h, washing the obtained mixture for multiple times until the filtrate is neutral, drying to obtain surface hydroxylated hexagonal boron nitride, adding 0.5-0.6mol of hydroxylated hexagonal boron nitride into 120mL of toluene solution, heating to 80-90 ℃, adding 0.1-0.2mol of amino-containing silane coupling agent while stirring, reacting the hydroxylated hexagonal boron nitride with the amino-containing silane coupling agent for 5h, distilling under reduced pressure for 2h to obtain a crude product, washing with toluene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain modified nano hexagonal boron nitride;
s2, dispersing the modified hexagonal boron nitride prepared in the S1 by using 100-110mL of methylbenzene, adding 0.25-0.3mol of dialkene alcohol compound, reacting for 24h at 60-70 ℃, distilling under reduced pressure for 2h, washing by using methylbenzene, filtering, removing unreacted monomers, drying under vacuum for 2h, adding 0.25-0.3mol of dried product into 100-110mL of methylbenzene, stirring until the product is dispersed, keeping introducing nitrogen for 20-30min, slowly adding 0.25-0.3mol of diamine compound, heating to 10 ℃, reacting for 48h, distilling under reduced pressure, washing by using methylbenzene, filtering, removing unreacted monomers, and drying under vacuum for 2h to obtain a compound with a terminal functional group of amine;
s3, dispersing the compound with the amine as the terminal functional group prepared in the step S2 by using 100-110mL of toluene, adding 0.25-0.3mol of sulfonic acid compound containing an olefinic bond, reacting for 48h at 65-70 ℃, distilling under reduced pressure for 2h, washing by using toluene, filtering, removing unreacted monomers, drying for 2h in vacuum, and grinding a dried sample to obtain a modified hexagonal boron nitride polymer with the particle size of 150-380 nm;
in the above step, the amino-containing silane coupling agent is one of gamma-aminopropyltrimethoxysilane KH540, gamma-aminopropyltriethoxysilane KH550, N-2-aminoethyl-3-aminopropyltrimethoxysilane KH-792; the dialkene alcohol compound is one of 1,4-pentadiene-3-alcohol, 1,5-hexadiene-3,4-diol; the diamine compound is one of ethylenediamine, 1,2-propanediamine, 1,4-butanediamine and 1,5-pentanediamine; the sulfonic acid compound containing olefinic bond is one of vinyl sulfonic acid, 2-methyl-2-acrylic acid-2-sulfoethyl ester and 2-acrylamide-2-methylpropanesulfonic acid.
2. A water-based drilling fluid, which is characterized in that the high-temperature-resistant modified hexagonal boron nitride nano plugging agent as claimed in claim 1 is added in the drilling fluid.
3. The water-based drilling fluid of claim 2, wherein the drilling fluid comprises the following components: water, bentonite, anhydrous NaCO 3 NaOH, caO, a coating agent KPAM, a fluid loss additive SMP-1, an anti-collapse agent FRH, an anti-seize lubricant FK-10, the high temperature resistant modified hexagonal boron nitride nano plugging agent of claim 1, a shear strength improving agent NH-1 and a weighting agent nano barite.
4. The water-based drilling fluid of claim 3, wherein the water-based drilling fluid is based on 100 parts by weight of waterThe addition amount of the bentonite is 2-4 parts by weight, and the anhydrous NaCO is 3 The addition amount of the high-temperature-resistant modified hexagonal boron nitride nano plugging agent is 0.3-0.5 part by weight, the addition amount of NaOH is 0.1-0.3 part by weight, the addition amount of CaO is 0.3-0.5 part by weight, the addition amount of the coating agent KPAM is 0.01-0.03 part by weight, the addition amount of the fluid loss additive SMP-1 is 5-6 parts by weight, the addition amount of the anti-collapse agent FRH is 3-5 parts by weight, the addition amount of the anti-seize lubricant FK-10 is 4-5 parts by weight, the addition amount of the high-temperature-resistant modified hexagonal boron nitride nano plugging agent in claim 1 is 1-5 parts by weight, the addition amount of the shear agent NH-1 is 1-2 parts by weight, and the addition amount of the weighting agent nano spar is 0-220 parts by weight.
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