CN114426813B - High-temperature-resistant gel particle plugging agent while drilling as well as preparation method and application thereof - Google Patents
High-temperature-resistant gel particle plugging agent while drilling as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant gel particle plugging agent while drilling as well as a preparation method and application thereof, and relates to the field of plugging of drilling fluid. The high-temperature-resistant gel particle plugging agent while drilling comprises a component A and a component B, wherein the component A comprises modified silicon dioxide grafted by an allyl cyclodextrin monomer; the component B comprises modified silica grafted with hydrophobic monomers. The high-temperature-resistant gel particle plugging agent while drilling has good temperature and pressure resistance, can be used in a high-temperature environment of 200 ℃, and the components A and B form an enveloping structure through the hydrophobic effect on the grafted polymer groups, so that the synergistic effect is exerted, the structural strength is further improved, and the temperature resistance and the pressure resistance of the plugging agent are further improved.
Description
Technical Field
The invention relates to the field of drilling fluid plugging, in particular to a high-temperature-resistant gel particle plugging agent while drilling as well as a preparation method and application thereof.
Background
The well leakage is a phenomenon that drilling fluid or other mediums (well cementation cement slurry and the like) in a shaft leaks into the space of formation pores, cracks and the like in the well drilling process, and is a common underground complex condition, and the reason for the well leakage is that the liquid column pressure in the shaft is larger than the formation pressure, the formation pores are large, the permeability is good, karst cave, cracks and the like are formed; improper drilling measures can also cause lost circulation, such as excessive pump opening, excessive drill rate, pressure-induced lost circulation formation, etc. The method is easy to occur when drilling complex stratum such as cracking, karst cave and breaking, and is used for treating lost circulation, which is one of the difficulties of drilling technology, and not only is time and labor consumed, but also serious harm such as stuck drilling, blowout, collapse and the like can be caused, and even the well is scrapped.
At present, the lost circulation is mainly treated by adding plugging agent while drilling. There are two general classes of plugging agents: the first type is bridging plugging materials, which are plugged through the actions of bridging, lacing wires, filling and the like, the plugging agents are low in price, large in dosage, and can cause adverse effects on lubrication and rheology of drilling fluid, so that the drilling efficiency is reduced; the second type is a polymer plugging agent, which has the characteristics of water absorption expansion and deformability, can be extruded into a stratum crack to form a strong and tough plugging layer, has higher plugging efficiency, small addition amount and stronger adaptability, but can be degraded or crosslinked under high temperature conditions to lose plugging performance, and simultaneously, is easy to shear and degrade under high pressure conditions to lose stability and flow in pores to lose plugging effect. Therefore, it is the core of this field to improve the high temperature and pressure resistance of polymer plugging agents.
The Chinese patent application CN102603985A discloses a high-temperature-resistant plugging agent while drilling, which is prepared by adding various crosslinking agents through emulsion polymerization of oil-soluble monomers and water-soluble monomers, can expand when meeting water and oil, and can be used for plugging at 180 ℃, but because the high-temperature-resistant plugging agent while drilling is added with more crosslinking agents, the expansion performance and the deformation performance of the plugging agent are reduced while the temperature resistance is improved, so that the plugging adaptability is reduced, and the pressure resistance is reduced.
The literature (Lai Xiaolin, wanghua, deng Huajiang, etc. development of dual-network water-absorbent resin plugging agent [ J ]. Oil drilling technique, 2011 (04): 33-37.) reports a novel water-absorbent resin-dual-network water-absorbent resin plugging agent capable of resisting 150 ℃ for a long time, and the dual-network water-absorbent resin plugging agent DNG is developed aiming at the problems of insufficient temperature resistance, insufficient strength and the like of the existing water-absorbent resin plugging agent in high-temperature stratum plugging operation. DNG has a double-network structure with 'hardness and softness' and greatly improves the strength and the temperature resistance, the compressive strength at 95% deformation reaches 16.2MPa, and the DNG can rebound rapidly and keep a complete form after pressure release; the product still maintains the complete form and has good strength after aging for 30 days at the high temperature of 150 ℃; the water absorption multiple is 4-10 times, and has better salt resistance and pH sensitivity resistance. The high temperature resistance of the material needs to be further improved.
In view of the above, the application solves the problems of poor high temperature resistance and low plugging effect on a leakage channel of the plugging agent in the prior art, provides the high temperature resistant gel particle plugging agent while drilling, and the preparation method and application thereof, and has less influence on other properties of drilling fluid and excellent plugging effect.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant gel particle plugging agent while drilling, a preparation method and application thereof, and the high-temperature-resistant gel particle plugging agent has strong high-temperature resistance and pressure bearing capacity, less influence on other properties of drilling fluid and excellent plugging effect.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
firstly, the invention provides a high-temperature-resistant gel particle plugging agent while drilling, which comprises a component A and a component B, wherein the component A comprises modified silicon dioxide grafted by an allyl cyclodextrin monomer; the component B comprises modified silica grafted with hydrophobic monomers.
Secondly, the invention also provides a preparation method of the high-temperature-resistant gel particle plugging agent while drilling, which comprises the following steps:
(1) Modifying the surface of silicon dioxide by using a silane coupling agent to obtain a silicon dioxide modified product;
(2) Preparing a component A: grafting copolymerization of allyl cyclodextrin and the silicon dioxide modified product obtained in the step (1) to obtain a component A,
and (3) preparing a component B: graft copolymerizing a hydrophobic monomer with the silicon dioxide modified product obtained in the step (1) to obtain a component B;
the component A and the component B form the high-temperature-resistant gel particle plugging agent while drilling.
Preferably, the silane coupling agent is at least one selected from gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, methyl triethoxysilane, gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl triethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl trimethyl, oxysilane, N-beta- (aminoethyl) -gamma-aminopropyl methyldimethoxy silane; further preferably at least one of gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, methyl triethoxysilane, gamma-aminopropyl triethoxysilane; most preferred is gamma-aminopropyl triethoxysilane.
Preferably, the mass ratio of the silane coupling agent to the silicon dioxide is 2-3:10.
preferably, the mass ratio of the allyl cyclodextrin to the silica modified product obtained in the step (1) is 2-3:5.
preferably, the hydrophobic monomer is an N-alkyl acrylamide; further preferably, the alkyl group is C 8 -C 20 An alkyl group; most preferred is N-hexadecylacrylamide.
Preferably, the mass ratio of the hydrophobic monomer to the silica modified product obtained in the step (1) is 0.2 to 0.3:5.
preferably, the step (1) specifically comprises:
mixing alcohol, water and silicon dioxide uniformly, regulating pH to 3-5, adding a silane coupling agent, heating to react under stirring, and obtaining a silicon dioxide modified product through centrifugal separation, washing and drying.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
the alcohol is one or more common alcohols such as methanol, ethanol, benzyl alcohol, ethylene glycol, n-propanol, n-octanol, and the like.
Such water includes, but is not limited to, distilled water, purified water, potable water, deionized water, and tap water.
The particle size of the silicon dioxide is matched with the size of the cracks and pores of the leakage stratum, preferably the particle size is 200-5000nm, and more preferably 5000nm.
The pH is preferably 4.
The temperature is raised to 50-80 ℃, preferably 70 ℃.
The washing agent is absolute ethyl alcohol or acetone.
Preferably, in the step (2), the preparation component a specifically includes:
uniformly dispersing the silicon dioxide modified product obtained in the step (1) in water, adding a hydrophilic monomer and a cross-linking agent, stirring and dissolving, heating, introducing nitrogen, adding an initiator for reaction, then adding allyl cyclodextrin for continuous reaction, and obtaining the component A through centrifugal separation, washing and drying.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
such water includes, but is not limited to, distilled water, purified water, potable water, deionized water, and tap water.
The hydrophilic monomers include acrylamide and 2-acrylamide-2-methylpropanesulfonic acid; preferably, the mass ratio of the hydrophilic monomer to the silica modified product is 34-35:5.
the cross-linking agent comprises N, N-methylene bisacrylamide; preferably, the mass ratio of the cross-linking agent to the silica modified product is 0.2-0.3:5.
the temperature rise means that the temperature is raised to 60-90 ℃, preferably 70 ℃.
The initiator is selected from one or two of potassium persulfate and ammonium persulfate.
The washing agent is absolute ethyl alcohol or acetone.
Preferably, in the step (2), the preparation component B specifically includes:
dissolving an emulsifier, alcohol and a hydrophobic monomer in an oil phase solvent, adding a hydrophilic monomer, a cross-linking agent and the mixed aqueous solution of the modified silicon dioxide obtained in the step (1), stirring to prepare a microemulsion, adding an initiator, heating for reaction, precipitating, and centrifugally separating, washing and drying to obtain the component B.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
the emulsifier is an oily emulsifier, preferably sorbitan oleate (span 80).
The alcohol is one or more common alcohols such as methanol, ethanol, benzyl alcohol, ethylene glycol, n-propanol, n-octanol, and the like.
The oil phase solvent is at least one of cyclohexane, white oil, kerosene and liquid paraffin.
The hydrophilic monomers include acrylamide and 2-acrylamide-2-methylpropanesulfonic acid.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is selected from one or two of potassium persulfate and ammonium persulfate.
The temperature rise means that the temperature is raised to 60-90 ℃, preferably 70 ℃.
The precipitation refers to ethanol precipitation.
The washing agent is absolute ethyl alcohol or acetone.
Finally, the invention provides application of the high-temperature-resistant gel particle plugging agent while drilling in plugging drilling fluid.
Preferably, the mass ratio of the component A to the component B is 1:1.
preferably, in application, the high-temperature-resistant gel particle plugging agent while drilling is added into a base fluid for use, and further preferably, the high-temperature-resistant gel particle plugging agent while drilling is 2% relative to the base fluid by weight.
Compared with the prior art, the invention has the following beneficial effects:
(1) The plugging agent has a multi-layer structure, wherein the inner layer is silicon dioxide particles, the secondary outer layer is a cross-linked structure, and the outermost layer is a diffusion layer with functional monomers. Has rigidity and deformation performance, improves the temperature resistance and the bearing capacity, the method can be suitable for well drilling plugging operation within 200 ℃;
(2) The plugging agent disclosed by the invention consists of two grafted modified silicon dioxide, wherein polymer chain segments at the outermost layers of the two grafted silicon dioxide are provided with different functional monomers, and cyclodextrin groups serving as functional groups and hydrophobic chain segments have a hydrophobic effect to form an envelope structure, so that the structural strength of the plugging agent can be further increased, and the bearing capacity of the plugging agent is further improved.
Drawings
FIG. 1 is an appearance of component A prepared according to the present invention;
FIG. 2 is an appearance of component B prepared according to the present invention.
Detailed Description
In order that the manner in which the above recited features and advantages of the present invention are obtained, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention.
The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents, etc. used in the following examples are commercially available unless otherwise specified.
In the embodiments described in the following description of the embodiments,
gamma-aminopropyl triethoxysilane is available from Shanghai microphone Biochemical technology Co., ltd,
gamma-methacryloxypropyl trimethoxysilane was purchased from Shanghai Meilin Biochemical technologies Co., ltd,
vinyl triethoxysilane is available from Shanghai Meilin Biochemical technologies Co., ltd., product number T818810,
the silicon dioxide is purchased from Shanghai microphone Biochemical technology Co., ltd, the product number is Shanghai microphone Biochemical technology Co., ltd, the particle size is 5000nm,
acrylamide was purchased from Shanghai Meilin Biochemical technologies Co., ltd., product number A800656,
2-acrylamide-2-methylpropanesulfonic acid was purchased from Shanghai Meilin Biochemical technology Co., ltd., product number A821820,
n, N-methylenebisacrylamide was purchased from Shanghai Meilin Biochemical technologies Co., ltd., product number M6024,
n-tetradecylacrylamide was purchased from Shanghai Meilin Biochemical technologies Co., ltd,
n-hexadecylacrylamide was purchased from Shanghai microphone Biochemical technology Co., ltd,
n-octadecyl acrylamide was purchased from Shanghai Michlin Biochemical technologies Co.
Example 1
The preparation method of the high-temperature-resistant gel particle plugging agent while drilling comprises the following steps:
(1) Sequentially adding 300ml of ethanol, 100ml of deionized water and 10g of silicon dioxide into a 500ml three-neck flask, regulating the pH to 4, uniformly stirring, adding 3g of gamma-aminopropyl triethoxysilane, heating to 70 ℃ under the stirring condition of 50 ℃, reacting for 3 hours, centrifugally separating the product by a high-speed centrifugal machine (the centrifugal speed is 6000r/min and the time is 20 min), washing for 2 times by absolute ethyl alcohol, and drying to obtain a silicon dioxide modified product;
(2) Preparing a component A:
uniformly dispersing 5g of the silica modified product prepared in the step (1) in 300ml of deionized water, adding 30g of acrylamide, 5g of 2-acrylamide-2-methylpropanesulfonic acid and 0.2g of N, N-methylenebisacrylamide, stirring for dissolving, heating to 70 ℃, introducing nitrogen for 30min, adding 0.1g of ammonium persulfate, reacting for 0.5h, then adding 2g of allyl cyclodextrin (prepared by the method of China patent CN 2007100490388), continuing to react for 4h, centrifugally separating the product by a high-speed centrifuge (the centrifugal speed is 6000r/min, the time is 20 min), washing for 2 times by absolute ethyl alcohol, drying and crushing to obtain a light yellow solid component A1;
and (3) preparing a component B:
dissolving 150ml of white oil, 5g of span80 and 4g of n-octanol, 0.2g g N-hexadecylacrylamide in a 500ml three-neck flask, adding 150ml of a mixed aqueous solution of 30g of acrylamide, 5g of 2-acrylamide-2-methylpropanesulfonic acid, 0.2g of N, N-methylenebisacrylamide and 5g of modified silicon dioxide prepared in the step (1) into the three-neck flask, stirring to prepare a microemulsion, finally adding 0.1g of ammonium persulfate, heating to 70 ℃, carrying out polymerization for 2 hours, adding 2 liters of ethanol for precipitation, carrying out centrifugal separation by a high-speed centrifuge (the centrifugal rotation speed is 6000r/min, the time is 20 min), washing 2 times by absolute ethanol, and drying to obtain a white powder component B1;
the obtained component A1 and the component B1 form the high temperature resistant gel particle plugging agent while drilling in the embodiment.
Example 2
The preparation method of the high-temperature-resistant gel particle plugging agent while drilling comprises the following steps:
(1) 300ml of ethanol, 100ml of deionized water and 10g of silicon dioxide are sequentially added into a 500ml three-neck flask, the pH value is regulated to 4, after the mixture is uniformly stirred, 2g of gamma-methacryloxypropyl trimethoxy silane is added, the temperature is raised to 70 ℃ under the stirring condition of 50 ℃, the reaction is carried out for 3 hours, then the product is centrifugally separated by a high-speed centrifugal machine (the centrifugal speed is 6000r/min and the time is 20 min), and the product is washed by acetone for 2 times and dried, thus obtaining the silicon dioxide modified product.
(2) Preparing a component A:
taking 5g of the silicon dioxide modified product prepared in the step (1), uniformly dispersing in 300ml of deionized water, adding 30g of acrylamide, 4g of 2-acrylamide-2-methylpropanesulfonic acid and 0.3g of N, N-methylenebisacrylamide, stirring for dissolving, heating to 70 ℃, introducing nitrogen for 30min, adding 0.1g of ammonium persulfate, reacting for 0.5h, then adding 2.5g of allyl cyclodextrin (prepared according to the method of Chinese patent CN 2007100490388), continuing reacting for 4h, adding 2L of ethanol into the product for precipitation, centrifuging by a high-speed centrifuge (the centrifugal speed is 6000r/min for 20 min), washing for 2 times by acetone, drying and crushing to obtain a light yellow solid component A2.
And (3) preparing a component B:
dissolving 150ml of kerosene, 5g of span80 and 4g of n-octanol, 0.25g of g N-octadecylacrylamide in a 500ml three-neck flask, adding 150ml of a mixed aqueous solution of 30g of acrylamide, 4g of 2-acrylamide-2-methylpropanesulfonic acid, 0.1g of N, N-methylenebisacrylamide and 5g of modified silicon dioxide prepared in the step (1) into the three-neck flask , stirring for a certain time to prepare a microemulsion, adding 0.1g of ammonium persulfate, heating to 70 ℃, carrying out polymerization reaction for 2 hours, adding 2 liters of ethanol for precipitation, carrying out centrifugal separation by a high-speed centrifuge (the centrifugal speed is 6000r/min, the time is 20 min), washing 2 times by acetone, and drying to obtain a white powder component B2;
the component A2 and the component B2 form the high-temperature-resistant gel particle plugging agent while drilling.
Example 3
The preparation method of the high-temperature-resistant gel particle plugging agent while drilling comprises the following steps:
(1) 300ml of ethanol, 100ml of deionized water and 10g of silicon dioxide are sequentially added into a 500ml three-neck flask, the pH is adjusted to 4, after uniform stirring, 2.5g of vinyltriethoxysilane is added, the temperature is raised to 70 ℃ under the stirring condition of 50 ℃ for 3 hours of reaction, then the product is centrifugally separated by a high-speed centrifuge (the centrifugal speed is 6000r/min and the time is 20 min), and the product is washed for 2 times by acetone and dried, thus obtaining the silicon dioxide modified product.
(2) Preparing a component A:
uniformly dispersing 5g of the silica modified product prepared in the step (1) in 300ml of deionized water, adding 30g of acrylamide, 4.5g of 2-acrylamide-2-methylpropanesulfonic acid and 0.2g of N, N-methylenebisacrylamide, stirring for dissolving, heating to 70 ℃, introducing nitrogen for 30min, adding 0.1g of potassium persulfate, reacting for 0.5h, then adding 3g of allyl cyclodextrin (prepared according to the method of Chinese patent CN 2007100490388), continuing reacting for 4h, centrifugally separating the product by a high-speed centrifuge (the centrifugal speed is 6000r/min for 20 min), washing for 2 times by acetone, drying and crushing to obtain a light yellow solid component A3;
and (3) preparing a component B:
150m cyclohexane, 5g span80 and 4g n-octanol, 0.3-g N-tetradecylacrylamide are dissolved in a 500ml three-neck flask, then a mixed aqueous solution of 30g acrylamide, 4.5g 2-acrylamide-2-methylpropanesulfonic acid, 0.1g N, N-methylenebisacrylamide and 5g modified silica prepared according to the step (1) is added into the three-neck flask, stirred to prepare a microemulsion, finally 0.1g ammonium persulfate is added, the temperature is raised to 70 ℃, the polymerization reaction is carried out for 2 hours, 2 liters of ethanol is added for precipitation, centrifugal separation is carried out by a high-speed centrifuge (the centrifugal rotation speed is 6000r/min, the time is 20 min), and acetone is used for washing 2 times and drying is carried out to obtain a white powder product B3.
The component A3 and the component B3 form the high-temperature-resistant gel particle plugging agent while drilling.
Performance testing
Preparing a base solution which comprises the following components in percentage by mass: 4% bentonite, 1% zwitterionic polymer coating (FA 367), 1% NaCO 3 As blanks, 3% kcl, 2% polyamine, 1.5% lignite resin, 2% sulfonated asphalt, 1% emulsified asphalt and balance barite.
Components A1-3 and B1-3 of the high temperature resistant gel particle plugging while drilling agent prepared in examples 1-3 are respectively added into base fluid, the specific addition amounts are shown in tables 1-6, and meanwhile, 2% of unmodified silicon dioxide and 2% of crosslinked polyacrylamide (with the particle size of 1-3 μm) are added for comparison, so that plugging performance testing is carried out.
Filtration loss test: the drilling fluid is heated and rolled for 16 hours at 180 ℃ to measure the API filtration loss, and the high-temperature high-pressure filtration loss is measured at 180 ℃.
And (3) carrying out bearing capacity test: placing a core model with a seam of 20-40 μm in a holder, circularly pressing 10MPa, saturating water, then injecting plugging agent liquid with a mass concentration of 2% and a volume of 0.1PV (core pore volume multiple), then injecting drilling fluid, recording injection pressure and leakage condition at the outlet of the core holder, taking the pressure value at the outlet when leakage begins to occur as the highest bearing capacity of the plugging agent, and testing the retention temperature at 180 ℃.
And (3) testing temperature resistance, namely testing the fluid loss and pressure bearing capacity within the range of 140-200 ℃ by using base fluid +111111B1 as an experimental object (the percentages of the components A and B are weight ratio relative to the base fluid, for example, 2% A1 is that the added mass of A1 is 2% of the mass of the base fluid).
TABLE 1 Performance test data for example 1
TABLE 2 temperature resistance test data for example 1
| Base solution +1% A1+1% B1 | 140℃ | 160℃ | 180℃ | 200℃ |
| API(ml) | 1.7 | 1.9 | 2.2 | 3.5 |
| High temperature high pressure fluid loss (ml) | 14.4 | 14.5 | 15.6 | 20.4 |
| Pressure bearing capacity (MPa) | 5.4 | 5.5 | 4.8 | 4.5 |
TABLE 3 Performance test data for example 2
| API(ml) | High temperature high pressure fluid loss (ml) | Bearing capacity MPa | |
| Base solution +2% A2 | 10.3 | 34.2 | 2.1 |
| Base solution +2% B2 | 10.4 | 36.2 | 2.5 |
| Base+1% A2+1% B2 | 3.7 | 14.2 | 4.7 |
TABLE 4 temperature resistance test data for example 2
| Base solution +1% A2+1% B2 | 140℃ | 160℃ | 180℃ | 200℃ |
| API(ml) | 1.9 | 2.2 | 2.4 | 3.9 |
| High temperature high pressure fluid loss (ml) | 15.2 | 15.3 | 16.4 | 22.3 |
| Pressure bearing capacity (MPa) | 5.7 | 5.6 | 5.2 | 4.8 |
TABLE 5 Performance test data for example 3
TABLE 6 example 3 temperature resistance test data
| Base solution +1% A3+1% B3 | 140℃ | 160℃ | 180℃ | 200℃ |
| API(ml) | 1.6 | 1.8 | 2.0 | 2.7 |
| High temperature high pressure fluid loss (ml) | 13.4 | 14.1 | 14.9 | 17.4 |
| Pressure bearing capacity (MPa) | 5.2 | 5.3 | 4.6 | 4.6 |
It can be seen that the plugging agent prepared by the invention has good temperature and pressure resistance, and can be used in a high-temperature environment of 200 ℃, and the components A and B of the plugging agent form an enveloping structure through the hydrophobic effect on the grafted polymer groups, so that the synergistic effect is exerted, the structural strength is further improved, and the temperature and pressure resistance of the plugging agent is further improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The high temperature resistant gel particle plugging agent while drilling is characterized by comprising a component A and a component B, wherein the component A comprises modified silicon dioxide grafted by an allyl cyclodextrin monomer; the component B comprises modified silicon dioxide grafted by hydrophobic monomer;
the preparation method comprises the following steps:
(1) Modifying the surface of silicon dioxide by using a silane coupling agent to obtain a silicon dioxide modified product;
(2) Preparing a component A: grafting copolymerization of allyl cyclodextrin and the silicon dioxide modified product obtained in the step (1) to obtain a component A,
and (3) preparing a component B: graft copolymerizing a hydrophobic monomer with the silicon dioxide modified product obtained in the step (1) to obtain a component B;
the component A and the component B form the high-temperature-resistant gel particle plugging agent while drilling,
in the step (2), the mass ratio of the allyl cyclodextrin to the silicon dioxide modified product obtained in the step (1) is 2-3:5, a step of; the hydrophobic monomer is N-alkyl acrylamide, and the mass ratio of the hydrophobic monomer to the silicon dioxide modified product obtained in the step (1) is 0.2-0.3:5, a step of;
in the step (2), the preparation component A specifically comprises the following steps: uniformly dispersing the silicon dioxide modified product obtained in the step (1) in water, adding a hydrophilic monomer and a cross-linking agent, stirring and dissolving, heating, introducing nitrogen, adding an initiator for reaction, then adding allyl cyclodextrin for continuous reaction, and obtaining a component A through centrifugal separation, washing and drying;
in the step (2), the preparation component B specifically comprises the following steps: dissolving an emulsifier, alcohol and a hydrophobic monomer in an oil phase solvent, adding a hydrophilic monomer, a cross-linking agent and the mixed aqueous solution of the modified silicon dioxide obtained in the step (1), stirring to prepare a microemulsion, adding an initiator, heating for reaction, precipitating, and centrifugally separating, washing and drying to obtain the component B.
2. The method for preparing the high-temperature-resistant gel particle plugging agent while drilling as claimed in claim 1, which is characterized by comprising the following steps:
(1) Modifying the surface of silicon dioxide by using a silane coupling agent to obtain a silicon dioxide modified product;
(2) Preparing a component A: grafting copolymerization of allyl cyclodextrin and the silicon dioxide modified product obtained in the step (1) to obtain a component A,
and (3) preparing a component B: graft copolymerizing a hydrophobic monomer with the silicon dioxide modified product obtained in the step (1) to obtain a component B;
the component A and the component B form the high-temperature-resistant gel particle plugging agent while drilling;
in the step (2), the mass ratio of the allyl cyclodextrin to the silicon dioxide modified product obtained in the step (1) is 2-3:5, a step of; the hydrophobic monomer is N-alkyl acrylamide, and the mass ratio of the hydrophobic monomer to the silicon dioxide modified product obtained in the step (1) is 0.2-0.3:5, a step of;
in the step (2), the preparation component A specifically comprises the following steps: uniformly dispersing the silicon dioxide modified product obtained in the step (1) in water, adding a hydrophilic monomer and a cross-linking agent, stirring and dissolving, heating, introducing nitrogen, adding an initiator for reaction, then adding allyl cyclodextrin for continuous reaction, and obtaining a component A through centrifugal separation, washing and drying;
in the step (2), the preparation component B specifically comprises the following steps: dissolving an emulsifier, alcohol and a hydrophobic monomer in an oil phase solvent, adding a hydrophilic monomer, a cross-linking agent and the mixed aqueous solution of the modified silicon dioxide obtained in the step (1), stirring to prepare a microemulsion, adding an initiator, heating for reaction, precipitating, and centrifugally separating, washing and drying to obtain the component B.
3. The method according to claim 2, wherein in the step (1), the silane coupling agent is at least one selected from the group consisting of γ -methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, methyl triethoxysilane, γ -aminopropyl triethoxysilane, γ -glycidol ether oxypropyl trimethoxysilane, N- (β -aminoethyl) - γ -aminopropyl triethoxysilane, N- β - (aminoethyl) - γ -aminopropyl methyldimethoxysilane.
4. The method according to claim 3, wherein the silane coupling agent is at least one selected from the group consisting of gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, methyl triethoxysilane, and gamma-aminopropyl triethoxysilane.
5. The method according to claim 2, wherein in the step (1), the mass ratio of the silane coupling agent to the silica is 2 to 3:10.
6. the preparation method according to claim 2, wherein the step (1) is specifically: mixing alcohol, water and silicon dioxide uniformly, regulating pH to 3-5, adding a silane coupling agent, heating to react under stirring, and obtaining a silicon dioxide modified product through centrifugal separation, washing and drying.
7. Use of the high temperature resistant gel particle plugging agent of claim 1 or prepared according to the preparation method of any one of claims 2-6 in plugging of drilling fluids.
8. The use according to claim 7, wherein the mass ratio of the component a to the component B in the high temperature resistant gel particle plugging while drilling agent is 1:1.
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