CN113136182A - High-temperature-resistant Pickering emulsion type drilling fluid and preparation method thereof - Google Patents
High-temperature-resistant Pickering emulsion type drilling fluid and preparation method thereof Download PDFInfo
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- CN113136182A CN113136182A CN202110432147.8A CN202110432147A CN113136182A CN 113136182 A CN113136182 A CN 113136182A CN 202110432147 A CN202110432147 A CN 202110432147A CN 113136182 A CN113136182 A CN 113136182A
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Abstract
The invention provides a high-temperature-resistant Pickering emulsion type drilling fluid and a preparation method thereof. The drilling fluid comprises a composition and a water phase, wherein the composition comprises the following components in parts by weight: oil phase: 30-70 parts of a solvent; modified organic soil: 0.5-4 parts; amphiphilic nano-material: 0.1-4 parts; compounding a plugging agent; 0.5-3 parts; weighting material: 0 to 2000 parts. The synergistic effect of the modified organic soil, the amphiphilic nano-particles and the composite plugging agent is utilized to prepare the material with the temperature resistance of 100-240 ℃ and the density of 0.8-2.6 g/cm3The high temperature resistant pickering emulsion drilling fluid. The drilling fluid has simple components, outstanding rheological property, low oil-water ratio, no need of using molecular surfactants, flow pattern regulators and the like, and saves the using amount and the cost of treating agents by 30 to 50 percent; the drilling fluid has stable performance, small filtration loss, outstanding rheological property, good suspension stability, low filtration loss, good acid solubility of filter cakes and outstanding plugging property under the condition of high temperature and high density.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to high-temperature-resistant Pickering emulsion type drilling fluid and a preparation method thereof.
Background
Pickering (Pickering) emulsions refer to emulsions stabilized by solid particles of colloidal size, the stabilization mechanism of which is primarily the adsorption of the solid particles at the oil-water interface and the formation of a monolayer/multilayer film of solid particles, thereby stabilizing the emulsion. Conventional emulsions stabilized with molecular surfactants or amphiphilic polymers are thermodynamically unstable systems, whereas emulsions stabilized with colloidal particles are hyperstable. In recent years, pickering emulsions have received increasing attention from researchers due to their low cost, environmental friendliness, high stability, and the like.
In the prior art, although the nano material can improve the stability of the pickering emulsion, the temperature resistance of the pickering emulsion is generally lower than 150 ℃. The liquid drops are settled and coalesced under the high temperature condition, and the stability of the emulsion is reduced. At the same time, the rheological property of the emulsion is deteriorated under high temperature conditions, which endangers the safety of downhole operation. In addition, to improve the thermal stability of existing pickering emulsions, commercial surfactants (such as modified tall oil fatty acids) are often added to the organoclay stabilized pickering emulsions. However, the toxicity and high cost of commercial surfactants are not negligible. In addition, the Pickering emulsion has large particle size, so that the Pickering emulsion has poor plugging performance on nano-micro level formation cracks, and serious drilling accidents and formation damage can be caused once the Pickering emulsion permeates into the formation. The conventional plugging material has the adaptability problem, even causes the demulsification of the pickering drilling fluid and causes serious downhole accidents. In addition, the plugging agent commonly used for the oil-based drilling fluid at present mainly utilizes the accumulation plugging principle to carry out composite plugging by rigid, soft and elastic solid particle plugging agents or liquid drop plugging agents. Wherein the solid particle plugging agent mainly comprises deformable asphalts, elastic polymers, rigid minerals and the like, and the asphalts and the minerals are easy to tackify and have certain influence on underground friction resistance; and the particle blocking agent can meet the problem of size matching degree only by meeting 2/3 bridging principle and 1/2 filling rule. However, in the field construction process, the pore sizes of the mud cakes formed by different drilling fluid systems or the same drilling fluid system under the conditions of different temperatures, pressures and material addition cannot be effectively measured or distinguished, so that the re-plugging effect of the solid particles on the mud cake net structure is probabilistic. The liquid drop blocking agent mainly forms a Jamin effect in micro cracks of a near well wall of a reservoir by water drops in the emulsion, but the contribution of the blocking agent is limited in a system with high oil-water ratio. Therefore, how to improve the temperature resistance and the blocking performance of the pickering emulsion while maintaining the inherent performance of the pickering emulsion is an urgent problem to be solved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a high-temperature-resistant Pickering emulsion type drilling fluid and a preparation method thereof. The Pickering emulsion type drilling fluid has the density of 0.8-2.6 g/cm at the temperature of 100-240 DEG C3Has good rheological property, suspension stability, filter cake removing property, filtration loss control and environmental protection in the range. The drilling fluid has simple components, outstanding rheological property, low oil-water ratio, no need of using molecular surfactant, flow pattern regulator and the like, saves the using amount and cost of treating agent by 30-50 percent, and has stable performance under the conditions of high temperature and high density. The technical scheme of the invention is as follows:
in a first aspect, the invention provides a composition of a high temperature resistant pickering emulsion type drilling fluid, which comprises the following components in parts by weight: oil phase: 30-70 parts of a solvent; modified organic soil: 0.5-4 parts; amphiphilic nano-material: 0.1-4 parts; compounding a plugging agent; 0.5-3 parts; weighting material: 0 to 2000 parts.
Optionally, the oil phase comprises at least one of diesel, white oil, gas oil, jet fuel, biodiesel.
Further, the modified organic soil is hydrophobic modified organic soil prepared by cation exchange reaction of clay and organic ammonium surfactant.
Optionally, the clay comprises at least one of montmorillonite, bentonite, sepiolite, attapulgite.
Further, the organic ammonium surfactant is at least one of octadecyl trimethyl ammonium bromide, dioctadecylamidopropyl trimethyl ammonium chloride, hexadecylamidopropyl trimethyl ammonium bromide and didodecylamiamidopropyl trimethyl ammonium chloride. Preferably, the organic ammonium surfactant is dioctadecylamidopropyl trimethyl ammonium chloride or dioctadecylamidopropyl trimethyl ammonium bromide.
Further, the amphiphilic nano material comprises at least one of amphiphilic nano silicon dioxide, amphiphilic nano aluminum oxide, amphiphilic nano zinc oxide, amphiphilic nano titanium oxide, amphiphilic nano zirconium oxide, amphiphilic nano magnesium oxide, amphiphilic nano zirconium oxide, amphiphilic nano ferroferric oxide, amphiphilic nano tin oxide and amphiphilic nano manganic oxide. In the present invention, there is no particular requirement for the crystal form of the nanoparticles. And the nanoparticles may be commercially available nanoparticles prepared by a vapor deposition method or a liquid deposition method. The original particle size of the nano-particles is between 10nm and 300 nm.
Preferably, the amphiphilic nano material is amphiphilic nano silicon dioxide.
Optionally, the preparation method of the amphiphilic nano-silica comprises:
(1) silanizing nano silicon dioxide with silane coupling agent, dispersing in paraffin at certain temperature, lowering temperature to fix nano silicon dioxide particles at paraffin-water interface, and drying;
(2) dispersing the dried and solidified paraffin emulsion drops into a hydrophobic monomer solution for reaction, filtering out the paraffin emulsion drops after the reaction is finished, and dissolving off the paraffin after washing to obtain hydrophobic modified nanoparticles;
(3) dispersing the hydrophobic modified nano-particles into hydrophilic monomers for reaction, and obtaining the amphiphilic nano-particles after the reaction is finished.
The silane coupling agent includes, but is not limited to, monomers such as KH570, KH560, APS, and the like. Hydrophobic monomers include, but are not limited to, lauric acid, stearic acid, oleic acid, C8～C22Long chain fatty acids such as alkyl acids. The hydrophilic monomer includes acrylic acid, 2-dimethylolbutyric acid, maleic anhydride, etc. and derivatives thereof.
Further, the composite plugging agent comprises the following components in parts by weight: 10-100 parts of hydrophobic nano particles, 1-50 parts of high-temperature resistant bridging particles, 0.1-10 parts of a cross-linking agent, 1-50 parts of expandable particles, 0-200 parts of a suspension, 1-50 parts of fibrous particles, 1-50 parts of deformable particles, 1-40 parts of rigid sheet materials and 0.01-20 parts of a surfactant.
Preferably: the composite plugging agent comprises the following components in parts by weight: 20-50 parts of hydrophobic nano particles, 10-20 parts of high-temperature resistant bridging particles, 0.1-10 parts of a cross-linking agent, 1-20 parts of expandable particles, 10-100 parts of a suspension, 1-10 parts of fibrous particles, 1-10 parts of deformable particles, 1-10 parts of rigid sheet materials and 0.01-5 parts of a surfactant.
Further, the preparation method of the composite plugging agent comprises the following steps: sequentially adding the deformable particles and the expandable particles into the suspension, uniformly mixing at 120-200 ℃, adding the surfactant, uniformly mixing, sequentially adding the cross-linking agent, the fibrous particles, the hydrophobic nano-particles, the high-temperature-resistant bridging particles and the rigid flaky material, and stirring at constant temperature for 1-6 hours. Standing, layering, filtering, vacuum drying at 150-200 ℃, crushing, and sieving with a 10-50 mesh sieve. And obtaining the composite plugging agent.
Further, the hydrophobic nanoparticles are one or more of Polymethylsilsesquioxane (PMSQ), polyaminopropyl/methylsilsesquioxane nanospheres, polymethyl methacrylate/polymethylsilsesquioxane copolymer microspheres, polymethyl methacrylate/trapezoidal polyphenylsilsesquioxane copolymer microspheres, polymethylsilsesquioxane and blend microspheres of derivatives thereof.
Further, the high-temperature resistant bridging particles are at least one of calcium carbonate, quartz sand, glass powder, ceramic powder, magnesium stearate powder, talcum powder, micro silica gel, calcium hydrogen phosphate powder and graphite powder.
Further, the expandable particles are made of oil-soluble resins such as polyethylene powder, polyoxyethylene resin, polyvinyl chloride resin, polyester resin, and polyamide resin, and have a diameter of 0.1mm to 0.5 cm.
Further, the suspension is: at least one of simethicone, dimethicone chinlon oil, avocado oil, and suspension polyethylene wax emulsion.
Further, the fibrous particles are at least one of plant fibers, viscose fibers, acetate fibers, polyester fibers (terylene), polyamide fibers (polyamide or nylon), polyacrylonitrile fibers (acrylon), polypropylene fibers (polypropylene) and polyvinyl chloride fibers (polyvinyl chloride), and the length of the fibrous particles is 0.1 cm-2 cm.
Further, the deformable particles are at least one of sulfonated asphalt, modified asphalt and rubber particles, and the diameter of the deformable particles is 0.1-0.5 cm.
Further, the rigid sheet material is at least one of shell residues, clam shell residues, sheet resin and waste plastic sheets, and the diameter of the rigid sheet material is 0.1-2 cm.
Further, the cross-linking agent is one or more of organic peroxide (dicumyl peroxide, bis 2, 4-dichlorobenzoyl peroxide), organic silicon (ethyl orthosilicate, methyl orthosilicate and trimethoxy silane) and polyalcohol (polyethylene glycol, polypropylene glycol, trimethylolpropane and trimethylolethane).
Further, the composition further comprises: fluid loss additive: 0.5-5 parts; alkalinity regulator: 0-5 parts; wetting agent: 0 to 3 parts.
Optionally, the fluid loss additive is one of asphalt oxide, humic acid and polymer fluid loss additive.
Further, the alkalinity regulator is calcium oxide.
Further, the wetting agent is one of lecithin, cetyl trimethyl ammonium bromide and imidazoline amphoteric surfactant.
In a second aspect, the present invention provides a high temperature resistant pickering emulsion type drilling fluid comprising the above composition and an aqueous phase.
Preferably, the amphiphilic nanomaterial in the composition is amphiphilic nanosilica.
More preferably, the weight ratio of the modified organic soil to the amphiphilic nano silicon dioxide in the composition is 1: 3.
further, the addition amount of the water phase is 30-70 parts.
Optionally, the aqueous phase is one of pure water, tap water, or an electrolyte solution.
Further, the electrolyte solution is one of a sodium carbonate solution, a sodium chloride solution, a calcium chloride solution or a magnesium chloride solution. Preferably, the electrolyte solution is a calcium chloride solution with a mass percentage concentration of 10-25%.
In a third aspect, the invention provides a preparation method of the high temperature resistant pickering emulsion type drilling fluid, which comprises the following steps: preparing materials according to the formula of the components of the high-temperature-resistant Pickering emulsion type drilling fluid; pouring the modified organic soil into the oil phase, and stirring at 6000-12000 rpm for 10-30 minutes; then adding the amphiphilic nano material, stirring for 10 minutes to 1 hour at the speed of 6000rpm to 12000rpm, and then stirring for 0 hour to 24 hours at the low speed of 100rpm to 1000 rpm; then adding the water phase to emulsify for 30 minutes at the speed of 8000 rpm-12000 rpm, adding the rest components, and uniformly mixing to obtain the finished product.
The high-temperature-resistant Pickering emulsion drilling fluid has the following beneficial effects:
1. the high-temperature resistant pickering emulsion provided by the invention utilizes modified organic soil, an amphiphilic nano material, a composite plugging agent and a synergistic effect, and forms high-temperature resistant pickering emulsion drilling fluid under the condition that a molecular emulsifier is not used, and the high-temperature resistant pickering emulsion drilling fluid can resist the temperature of 100-240 ℃, and maintain good rheological property, filtration performance and plugging performance after being aged at 240 ℃.
2. The high-temperature-resistant Pickering drilling fluid disclosed by the invention can improve the space structure and gel strength of the high-temperature-resistant Pickering drilling fluid by utilizing the synergistic effect of the modified organic soil and the amphiphilic nanoparticles, ensures the suspension capacity of the Pickering drilling fluid on solid phases such as a weighting agent and the like under the condition of not using a molecular cutting agent, improves the density limit of the Pickering drilling fluid, and can increase the density to 0.8-2.6 g/cm3。
3. The high-temperature resistant Pickering drilling fluid has ultrahigh stability, and the drilling fluid is obtained after the emulsion is static for 2-6 monthsThe precipitation amount of the continuous phase is less than 5 percent. The demulsification voltage is more than or equal to 600V before and after high temperature aging, the temperature can be up to 240 ℃, and the density can be increased to 2.6g/cm3The high-temperature and high-pressure filtration loss is less than or equal to 10mL, and the plugging invasion depth of the medium-pressure sand bed is less than or equal to 5 cm; the oil-based drilling fluid system has the advantages of good temperature resistance, small filtration loss, outstanding rheological property, good suspension stability and good emulsion stability.
4. The filter cake prepared by the high-temperature resistant Pickering drilling fluid disclosed by the invention has the main skeleton of nano particles, and the nano particles can be dissolved in acid, so that the filter cake is easy to remove, and the problems that the filter cake of the oil-based drilling fluid is difficult to remove and the like are solved.
5. The composite plugging agent used by the invention is formed by combining hydrophobic particle reinforcement, oil-soluble expanded particles, deformable particles and the like, has good adaptability in Pickering drilling fluid, is wide in particle size distribution, and can effectively plug nano-micron cracks and reduce the leakage of the drilling fluid due to cooperative work of different components.
6. The high-temperature-resistant Pickering drilling fluid prepared by the invention has simple drilling fluid components, outstanding rheological property, low oil-water ratio, no need of using molecular surfactants, flow pattern regulators and the like, and saves the using amount and cost of treating agents by 30-50%; the drilling fluid has stable performance under the conditions of high temperature and high density.
Drawings
FIG. 1 is a FTIR spectrum of original clay and modified organoclay in example 19 of the present invention.
FIG. 2 is a graph showing the particle size distribution of amphiphilic nanoparticles obtained in example 6 of the present invention.
FIG. 3 is a diagram of a Pickering emulsion prepared in example 20 of the present invention.
FIG. 4 shows the stable emulsion properties of the organic soil and the nano-silica with different surface properties in example 20 of the present invention.
FIG. 5 is an optical microscope image of an emulsion of 1 wt% of an organic soil and amphiphilic nanoparticles in example 20 of the present invention.
FIG. 6 is a graph showing the stability of emulsions at different aging temperatures in example 21 of the present invention.
Detailed Description
The preparation of the polymer fluid loss additive for the oil-based drilling fluid adopted by the embodiment of the invention is disclosed in the following reference documents: zhou Ming, Puxialin, Liu Lu, Wan Lei, oil-based drilling fluids used polymer fluid loss additive synthesis and performance evaluation [ J ] Fine chemistry, 2019,36(03): 520-.
The preparation of the polyaminopropyl/methyl silsesquioxane nanosphere adopted in the embodiment of the invention is disclosed in the following reference documents: huolifen, Gaiting, Wangchuanchuan, Yangbeiling, Weiwei, the synthesis and characterization of polyaminopropyl/methyl silsesquioxane nanospheres [ J ] fine chemical engineering, 2016,33(07): 721-.
In the description of the present invention, it is to be noted that those whose specific conditions are not specified in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturers. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The parts of the raw materials in the following examples are all parts by weight.
Examples 1 to 3 are methods for preparing modified organic soils.
Example 1
The embodiment provides a preparation method of modified organic soil, which comprises the following steps:
1 part of sodium bentonite is stirred for 1 hour in 20 parts of deionized water, 0.5 part of dioctadecylamidopropyl trimethyl ammonium chloride is added, the mixture is stirred for 1 hour at 1000rpm under the condition that the temperature is 40 ℃, and the mixture is centrifuged for 30min at 8000 rpm. Then adding 1 part of dioctadecylamidopropyl trimethyl ammonium chloride, stirring for 1h at 1000rpm under the condition that the temperature is 40 ℃, and rotating and centrifuging for 20min at 10000 rpm; and grinding and dispersing the precipitate on the lower layer on a ball mill for 6h, drying at 100 ℃ for 24 h, grinding, and sieving by using a 200-mesh sieve to obtain the modified organic soil.
Example 2
The embodiment provides a preparation method of modified organic soil, which comprises the following steps:
stirring 1 part of sepiolite in 20 parts of deionized water for 30 minutes, adding 1 part of octadecyl trimethyl ammonium bromide, stirring for 30 minutes at 1000rpm under the condition of the temperature of 45 ℃, and centrifuging for 30 minutes at 5000 rpm. Then 2 parts of dioctadecyltrimethylammonium bromide are added, and the mixture is stirred for 6 hours at the temperature of 45 ℃ and 1000rpm and is centrifuged for 30 minutes at 5000 rpm. And grinding and dispersing the precipitate on the lower layer on a ball mill for 6h, drying at 100 ℃ for 24 h, grinding, and sieving by using a 200-mesh sieve to obtain the modified organic soil.
Example 3
The embodiment provides a preparation method of modified organic soil, which comprises the following steps:
stirring 1 part of attapulgite in 30 parts of deionized water for 2 hours, adding 0.5 part of hexadecyl amidopropyl trimethyl ammonium bromide, stirring at 800rpm for 1 hour under the condition of the temperature of 45 ℃, and centrifuging at 8000rpm for 15 minutes. Then adding 0.5 part of didodecylamidopropyl trimethyl ammonium bromide, stirring at the temperature of 45 ℃ and 800rpm for 3 hours, rotating and centrifuging at 8000rpm for 10 minutes, taking the lower modified precipitate, grinding and dispersing on a ball mill for 0.5 hour, drying at 90 ℃ for 12 hours, grinding, and sieving by a 200-mesh sieve to obtain the modified organic soil.
Examples 4 to 7 are methods for preparing amphiphilic nanomaterials.
Example 4
The embodiment provides a preparation method of amphiphilic nano aluminum oxide, which comprises the following steps:
(1) weighing 2 parts of triaminopropyltriethoxysilane in 40 parts of ethanol, and adjusting the pH value to 3-4 by using a citric acid aqueous solution to obtain a silane solution.
(2) Adding 1 part of original nano aluminum oxide particles into a silane solution, heating in a water bath at 50 ℃, stirring for 4 hours, centrifuging, washing by using absolute ethyl alcohol, and performing ultrasonic dispersion to obtain the silanized nano silicon dioxide particles.
(3) Pouring 1 part of silanized nano aluminum oxide particles and 3 parts of liquid paraffin into a beaker filled with 20 parts of distilled water, and fully dispersing; stirring for 4h by using a heating magnetic stirrer at the temperature of 60 ℃ and the rotating speed of 1000r/min, cooling to room temperature, washing the surface of a sample in a beaker by using distilled water for 3 times, and performing vacuum drying in a drying box at the temperature of 45 ℃ for 1h to obtain a dried and solidified paraffin-silicon dioxide mixture.
(4) Dissolving 2 parts of lauric acid in 30 parts of dichloromethane solvent, dropwise adding 2 parts of thionyl chloride, stirring and reacting at the reaction temperature of 30 ℃ for 2 hours, and carrying out reduced pressure distillation to obtain a lauroyl chloride solution.
(5) Dispersing the dried and solidified paraffin-silicon dioxide mixture into lauroyl chloride solution, reacting for 3h at 30 ℃, and washing the surface of the paraffin emulsion drop with ethanol for multiple times after the reaction is finished to obtain the hydrophobic modified nano aluminum oxide particles.
(6) And dissolving paraffin in the hydrophobically modified nano aluminum oxide particles by using trichloromethane, centrifugally rinsing, adding 2% acrylic acid, adding a 4A molecular sieve, and reacting at 120 ℃ for 3 hours to obtain the amphiphilic nano aluminum oxide with the particle size of 100-200 nm.
Example 5
The embodiment provides a preparation method of amphiphilic nano magnesium oxide particles, which comprises the following steps:
(1) weighing 1 part by weight of gamma-glycidoxypropyltrimethoxysilane (KH560) and dissolving in ethanol, and adjusting the pH value to 3-4 by using a citric acid aqueous solution to obtain a silane solution.
(2) Adding 3 parts by weight of original nano magnesium oxide particles into a silane solution, heating in a water bath at 40 ℃, stirring for 4 hours, centrifuging, washing by using absolute ethyl alcohol, and performing ultrasonic dispersion to obtain the silanized nano silicon dioxide particles.
(3) Pouring 1 part of silanized nano silicon dioxide and 3-10 parts of liquid paraffin into a beaker filled with 20 parts of distilled water, fully dispersing, stirring for 4 hours at the temperature of 60 ℃ and the rotating speed of 1000r/min by adopting a heating magnetic stirrer, cooling to room temperature, washing the surface of a sample in the beaker by using distilled water for 3-5 times, and drying in a drying oven at the temperature of 45 ℃ for 1 hour in vacuum to obtain a dry and cured paraffin-magnesium oxide mixture.
(4) Dissolving 1 part of eicosyl acid in 20 parts of dichloromethane solvent, dropwise adding 2 parts of thionyl chloride, stirring and reacting at the reaction temperature of 30 ℃ for 4 hours, and carrying out reduced pressure distillation to obtain the eicosyl chloride solution.
(5) Dispersing the dried and solidified paraffin-magnesium oxide mixture into lauroyl chloride solution, reacting at room temperature for 3-6h, and washing the surface of the paraffin emulsion drop with ethanol for multiple times after the reaction is finished to obtain the hydrophobic modified nano silicon dioxide particles.
(6) And dissolving paraffin in the hydrophobically modified nano magnesium oxide particles by using trichloromethane, centrifugally rinsing, adding 1% of acrylic acid and 1% of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) solution, adding a catalyst KOH, and reacting at 120 ℃ for 4 hours to obtain the amphiphilic nano magnesium oxide with the particle size of 50-200 nm.
Example 6
The embodiment provides a preparation method of amphiphilic zinc oxide nanoparticles, which comprises the following steps:
(1) weighing 5 parts of gamma-methacryloxypropyltrimethoxysilane (KH570) and dissolving the gamma-methacryloxypropyltrimethoxysilane (KH570) in 80 parts of ethanol, and adjusting the pH value to 3-4 by using a citric acid aqueous solution to obtain a silane solution.
(2) Adding 2 parts of original nano zinc oxide into a silane solution, heating in a water bath at 30 ℃, stirring for 4 hours, centrifuging, washing by using absolute ethyl alcohol, and performing ultrasonic dispersion to obtain the silanized nano zinc oxide particles.
(3) Pouring 1 part of silanized nano zinc oxide particles and 6 parts of liquid paraffin into a beaker filled with 20 parts of distilled water, fully dispersing, stirring for 6 hours at the temperature of 60 ℃ and the rotating speed of 1000r/min by adopting a heating magnetic stirrer, cooling to room temperature, washing the surface of a sample in the beaker by using distilled water for 4 times, and drying in a drying oven at the temperature of 45 ℃ for 1 hour in vacuum to obtain a dry and cured paraffin-zinc oxide mixture.
(4) Dissolving 2 parts of oleic acid in 40 parts of dichloromethane solvent, dropwise adding 2 parts of thionyl chloride, stirring and reacting at the reaction temperature of 30 ℃ for 2 hours, and performing reduced pressure distillation to obtain an oleic acid acyl chloride solution.
(5) Dispersing the dried and solidified paraffin-zinc oxide mixture into an oleic acid acyl chloride solution, reacting for 6 hours at 30 ℃, and washing the surface of the paraffin emulsion drop for multiple times by using ethanol after the reaction is finished to obtain the hydrophobic modified nano zinc oxide particles.
(6) And dissolving paraffin in the hydrophobically modified nano zinc oxide particles by using trichloromethane, centrifugally rinsing, adding 1% of 2, 2-dimethylolbutyric acid, adding a catalyst KOH, and reacting at 140 ℃ for 5 hours to obtain the amphiphilic nano zinc oxide with the particle size of 100-300 nm.
Example 7
The present embodiment provides a method for preparing amphiphilic nano silica particles, which includes the following steps:
(1) weighing 3 parts of triaminopropyltriethoxysilane, dissolving in 30 parts of ethanol, and adjusting the pH value to 3-4 by using a citric acid aqueous solution to obtain a silane solution.
(2) Adding 2 parts of original nano silicon dioxide into a silane solution, heating in a water bath at 50 ℃, stirring for 4 hours, centrifuging, washing by using absolute ethyl alcohol, and performing ultrasonic dispersion to obtain the silanized nano silicon dioxide particles.
(3) Pouring 2 parts of silanized nano silicon dioxide particles and 5 parts of liquid paraffin into a beaker filled with 20mL of distilled water, fully dispersing, stirring for 6 hours at the temperature of 60 ℃ and the rotating speed of 1000r/min by adopting a heating magnetic stirrer, cooling to room temperature, washing the surface of a sample in the beaker by using distilled water for 4 times, and drying in a drying oven at the temperature of 45 ℃ for 1 hour in vacuum to obtain a dry and cured paraffin-silicon dioxide mixture.
(4) Dissolving 2 parts of palmitic acid in 20 parts of dichloromethane solvent, dropwise adding 2 parts of thionyl chloride, stirring and reacting at the reaction temperature of 30 ℃ for 2 hours, and performing reduced pressure distillation to obtain a palmitoyl chloride solution.
(5) Dispersing the dried and solidified paraffin-silicon dioxide mixture into palmitoyl chloride solution, reacting for 3h at 40 ℃, and washing the surface of the paraffin emulsion drop for multiple times by using ethanol after the reaction is finished to obtain the hydrophobic modified nano magnesium oxide particles.
(6) And dissolving the paraffin in the hydrophobically modified nano magnesium oxide particles by using trichloromethane, centrifugally rinsing, adding 3 percent maleic anhydride, adding a dehydrating agent, and reacting for 5 hours at the temperature of 100 ℃ to obtain the amphiphilic nano silicon dioxide.
Example 8/to example 11 are methods of preparing composite blocking agents.
Example 8
The embodiment provides a preparation method of a composite plugging agent, which specifically comprises the following steps:
3 parts of rubber particles with the diameter of 0.1-0.5 cm and 5 parts of polyamide resin are sequentially added into 60 parts of dimethyl silicone oil suspension, the mixture is uniformly mixed at 180 ℃, a surfactant SPAN80 is added and uniformly mixed, then 3 parts of cross-linking agent ethyl orthosilicate, 2 parts of polyester fiber, 2 parts of viscose fiber, 35 parts of PMSQ, 10 parts of calcium carbonate, 5 parts of talcum powder and 1 part of sheet resin with the diameter of 0.1-2 cm are sequentially added, and the mixture is stirred at constant temperature for 4 hours. Standing, layering, filtering, vacuum drying at 160 deg.C, pulverizing, and sieving with 40 mesh sieve. And obtaining the composite plugging agent.
Example 9
The embodiment provides a preparation method of a composite plugging agent, which specifically comprises the following steps:
sequentially adding 5 parts of sulfonated asphalt and 10 parts of polyoxyethylene resin into 100 parts of polydimethylsiloxane white pool flower seed oil suspension, uniformly mixing at 160 ℃, adding a surfactant Arlacel 80, uniformly mixing, sequentially adding 1 part of cross-linking agent dicumyl peroxide, 5 parts of polyamide fiber, 30 parts of polymethyl methacrylate/polymethyl silsesquioxane copolymer microspheres, 10 parts of superfine silica gel powder and 10 parts of shell residues with the diameter of 0.1-2 cm, and stirring at constant temperature for 4 hours. Standing, layering, filtering, vacuum drying at 200 deg.C, pulverizing, and sieving with 40 mesh sieve. And obtaining the composite plugging agent.
Example 10
The embodiment provides a preparation method of a composite plugging agent, which specifically comprises the following steps:
sequentially adding 10 parts of sulfonated asphalt and 20 parts of polyvinyl chloride resin into 20 parts of polyethylene wax emulsion suspension, uniformly mixing at 120 ℃, adding a surfactant Atmul 67, uniformly mixing, sequentially adding 8 parts of cross-linking agent trimethylolpropane, 3 parts of polyacrylonitrile fiber, 2 parts of acetate fiber, 4 parts of polypropylene fiber, 50 parts of polymethyl methacrylate/trapezoidal polyphenyl silsesquioxane copolymer microspheres, 20 parts of calcium hydrogen phosphate powder and 5 parts of clam shell residues with the diameter of 0.1-2 cm, and stirring at constant temperature for 4 hours. Standing, layering, filtering, vacuum drying at 120 deg.C, pulverizing, and sieving with 40 mesh sieve. And obtaining the composite plugging agent.
Example 11
The embodiment provides a preparation method of a composite plugging agent, which specifically comprises the following steps:
sequentially adding 10 parts of modified asphalt, 10 parts of sulfonated asphalt and 30 parts of polyoxyethylene resin into 100 parts of avocado oil suspension, uniformly mixing at 200 ℃, adding a surfactant Emcol EO, uniformly mixing, sequentially adding 0.5 part of cross-linking agent polyethylene glycol, 2 parts of polyvinyl chloride fiber, 2 parts of plant fiber, 40 parts of PMSQ, 10 parts of polyaminopropyl/methyl silsesquioxane nanospheres, 12 parts of graphite powder and 10 parts of waste plastic sheets with the diameter of 0.1-2 cm, and stirring at constant temperature for 1 hour. Standing, layering, filtering, vacuum drying at 180 deg.C, pulverizing, and sieving with 40 mesh sieve. And obtaining the composite plugging agent.
Examples 12 to 18 are methods of preparing high temperature resistant pickering emulsion drilling fluids.
Example 12
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: adding 1 part of the modified organic soil prepared in the example 1 into 70 parts of diesel oil, stirring for 20 minutes at a stirring speed of 10000rpm, then adding 1 part of the amphiphilic nanoparticles prepared in the example 4, stirring for 20 minutes at a stirring speed of 10000rpm, then magnetically stirring for 2 hours at a low speed of 500rpm, adding 30 parts of deionized water, and emulsifying for 30 minutes at a high speed of 10000 rpm; 5 parts of oxidized asphalt filtrate reducer, and stirring at high speed for 10 min. Adding a weighting material barite, 0.5 part of the composite plugging agent of the example 8, and adjusting the density of the drilling fluid to be 1.6g/cm3。
Example 13
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: 2 parts of the modified organic soil prepared in example 3 was added to 65 parts of diesel oil and stirred at a stirring speed of 12000rpm for 10 minutes; then 3 parts of the amphiphilic nano-silica particles prepared in example 5 are added, the mixture is stirred for 10 minutes at a stirring speed of 12000rpm, the low-speed magnetic stirring is continued for 12 hours, then 35 parts of 25 percent calcium chloride aqueous solution is added, the mixture is emulsified for 30 minutes at a high speed of 12000rpm, 2 parts of oxidized asphalt filtrate reducer, 0.5 part of calcium oxide and 2 parts of lecithin are sequentially added, and the mixture is addedBarite as a weighting material, 1 part of the composite plugging agent of example 9, and the density of the drilling fluid adjusted to 2.0g/cm3And stirring at high speed for 10min every time one treating agent is added.
Example 14
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: 4 parts of the organic soil prepared in example 2 was added to 50 parts of white oil and stirred at a stirring speed of 10000rpm for 20 minutes; adding 2 parts of the amphiphilic nanoparticles prepared in example 7, stirring at 10000rpm for 20 minutes, adding 50 parts of 25% calcium chloride aqueous solution, and emulsifying at 10000rpm for 30 minutes; sequentially adding 4 parts of humic acid fluid loss additive, 5 parts of calcium oxide and 3 parts of lecithin, adding 1 part of the composite plugging agent in the embodiment 8, adding micro manganese ore as a weighting material, and adjusting the density of the drilling fluid to be 2.4g/cm3And stirring at high speed for 10min every time one treating agent is added.
Example 15
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: 0.5 part of the organic soil prepared in example 1 was added to 50 parts of gasoline and stirred at a stirring speed of 8000rpm for 30 minutes. 0.1 part of the amphiphilic nanoparticles prepared in example 6 was added. Stirring at 8000rpm for 30 minutes; 50 parts of a 10% aqueous sodium chloride solution was added thereto, and the mixture was emulsified for 30 minutes with high-speed stirring at 80000 rpm. 0.5 part of humic acid fluid loss additive and 1 part of calcium oxide are added, 3 parts of the composite plugging agent in the embodiment 10 are added, calcium carbonate is added to be used as a weighting material, and the density of the drilling fluid is adjusted to be 1.0g/cm3And stirring at high speed for 10min every time one treating agent is added.
Example 16
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: 2 parts of the organic clay prepared in example 2 was added to 30 parts of the gassed oil and stirred at a stirring speed of 10000rpm for 20 minutes. 4 parts of the amphiphilic nanoparticles prepared in example 4 were added. Stirring was carried out at a stirring speed of 10000rpm for 20 minutes. Magnetically stir at 1000rpm for 24 hours. 70 parts of 10% calcium chloride aqueous solution was added thereto, and emulsified for 30 minutes with high-speed stirring at 10000 rpm. Sequential addition of oil-based wells5 parts of polymer fluid loss additive for liquid, 1 part of imidazoline surfactant, 2 parts of composite plugging agent added in the embodiment 11, calcium carbonate added as weighting material and the density of the drilling fluid adjusted to be 1.2g/cm3And stirring at high speed for 10min every time one treating agent is added.
Example 17
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: 1 part of the organic soil prepared in example 3 was added to 65 parts of aviation kerosene, and stirred at a stirring speed of 10000rpm for 30 minutes. 3 parts of the amphiphilic nanoparticles prepared in example 7 were added. Stirring was carried out at 10000rpm for 30 minutes and 200rpm for 6 hours by low-speed magnetic stirring. 35 parts of 25% calcium chloride aqueous solution was added thereto, and emulsified for 30 minutes with high-speed stirring at 10000 rpm. 3 parts of polymer fluid loss additive for oil-based drilling fluid, 3 parts of calcium oxide and 2 parts of hexadecyl trimethyl ammonium bromide are sequentially added, 3 parts of composite plugging agent in the embodiment 10 are added, barite is added to serve as a weighting material, and the density of the drilling fluid is adjusted to be 1.8g/cm3And stirring at high speed for 10min every time one treating agent is added.
Example 18
The embodiment provides a high-temperature-resistant Pickering drilling fluid which is prepared according to the following method: 1 part of the organic clay prepared in example 1 was added to 50 parts of diesel oil, and stirred at a stirring speed of 12000rpm for 30 minutes. 3 parts of the amphiphilic nanoparticles prepared in example 7 were added. Stirring was carried out at 12000rpm for 30 minutes and at 500rpm for 2 hours by magnetic stirring. 50 parts of 25% calcium chloride aqueous solution was added thereto, and emulsified for 30 minutes with high-speed stirring at 10000 rpm. Sequentially adding 2 parts of oil-based drilling fluid oxidized asphalt filtrate reducer, 4 parts of calcium oxide and 3 parts of lecithin, adding 1 part of the composite plugging agent in the embodiment 9, adding micro manganese ore and ultra-micro barite as weighting materials, and adjusting the density of the drilling fluid to be 2.6g/cm3And stirring at high speed for 10min every time one treating agent is added.
Example 19
Interaction mechanism research of modified organic soil, nano material and composite plugging agent
As shown in FIG. 1, the FTIR spectrum of the modified organoclay of example 1 was 2839.41cm-1、2925.55cm-1Two new absorption peaks corresponding to the symmetric and asymmetric stretching oscillations of the methylene group, respectively, which are derived from the hydrocarbon chain of cetylamidopropyltrimethylammonium chloride, confirm the adsorption of the surfactant on the clay surface.
TABLE 1 characterization of 4-7 amphiphilic nanoparticles
| Item | Contact angle (°) | Particle size (. mu.m) |
| Example 4 | 86.3 | 0.169 |
| Example 5 | 72.2 | 0.165 |
| Example 6 | 90.6 | 0.320 |
| Example 7 | 93.4 | 0.372 |
As can be seen from Table 1, the surface of the modified nanoparticles is amphiphilic, and the contact angle with the water phase is close to 90 degrees. The particle size distribution of the modified nano particles is still nano-scale, the particle size is increased compared with that before modification, and the modified nano particles can be better distributed on an oil-water interface. Fig. 2 is a graph showing the particle size distribution of the nanoparticles prepared in example 6, and it can be seen that the particle size distribution of the nanoparticles is relatively uniform.
Further, 1 part of the modified organic soil of example 1 was added to cyclohexane and stirred at a stirring speed of 12000rpm for 10 minutes; then 3 parts of the amphiphilic nano-silica particles prepared in example 7 were added, stirred at a stirring speed of 12000rpm for 10 minutes, followed by low-speed magnetic stirring at 200rpm for 12 hours, centrifuged and dried. The samples before and after the modified organic soil and the amphiphilic nanoparticles are adsorbed: dispersing in diesel oil, measuring its gel forming rate, measuring contact angle and d001 crystal layer spacing
And Zeta potential (mV). The results are shown in Table 2.
TABLE 2 EXAMPLES 1-3 evaluation of the interaction of Organosoil with nanoparticles (example 7)
After the organic soil is modified, the contact angle is increased, the hydrophobicity is enhanced, and the gel forming rate in the oil phase is increased. After the organic soil is adsorbed by the nano particles, the hydrophobicity is further enhanced, the contact angle with a water phase is increased, and the gelling rate is further improved. The modified organoclay is more prone to disperse in the oil phase, where the hydrophobically modified organoclay forms a "card house" structure in a combination of "facing end" and "end-to-end". Because the amphiphilic nano material is successfully embedded into the clay crystal layer and adsorbed on the clay surface which is not completely modified, the stripping of the organic soil is promoted, and thus, the d of the organic soil001The distance between crystal layers is further increased, and the hydrophobicity of the organic soil is enhanced. The interaction of the amphiphilic nano-particles and the organic soil is further proved by the Zeta potential, and the Zeta of the organic soil is further improved by adding the amphiphilic nano-particlesThe potential, hydrophobicity is enhanced, and agglomeration is easier in water.
Example 20
Synergistically stabilized emulsions of modified organoclays (example 1) and nanosilicas (example 7)
The organoclay prepared in example 1 and the nanoparticle prepared in example 7 were used as examples.
The amphiphilic nano silica particles prepared in example 7, 1 part of the modified organic clay prepared in example 1, and both were mixed according to a ratio of 1: 1, compounding and respectively adding the mixture into 50 parts of diesel oil, wherein the specific method comprises the following steps:
(1) after the single amphiphilic nano silicon dioxide particles or the modified organic soil are added into diesel oil, the mixture is stirred for 10 minutes at a stirring speed of 12000rpm, then stirred for 10 minutes at a stirring speed of 12000rpm, and then stirred for 6 hours at a low speed of 100rpm by magnetic force, and then 50 parts of 25% calcium chloride aqueous solution is added, and emulsified for 30 minutes at a high speed of 12000 rpm.
(2) For the compounding of the two, the modified organic soil is added into diesel oil, stirred for 10 minutes at the stirring speed of 12000rpm, added with the amphiphilic nano material, stirred for 10 minutes at the stirring speed of 12000rpm, continuously stirred for 6 hours at the low speed of 100rpm by magnetic force, then added with 50 parts of 25 percent calcium chloride aqueous solution, stirred at high speed of 12000rpm and emulsified for 30 minutes.
The results are shown in FIG. 3, where FIG. 3(a) illustrates that 1 wt% amphiphilic nano-silica does not form a stable emulsion. FIG. 3(b) shows that the emulsion stability of the clay alone is not high and the oil phase is precipitated much. FIG. 3(c) shows that the water-in-oil emulsion formed by 1 wt% of organic soil and 1 wt% of amphiphilic nano-silica is high in stability, and the oil phase separation rate is lower than 10% after 48 hours.
FIG. 4 is a graph showing the stability of the emulsion prepared from the modified organic clay of example 1 and nano-silica having different surface properties (commercially available hydrophobic nano-silica, amphiphilic nano-silica of example 7, and commercially available hydrophilic nano-silica) according to the above method (same as the method of FIG. 3) after standing for 48 h. As can be found from FIG. 4, the synergistic stability effect of the amphiphilic nano silica particles and the organic soil is the best, the precipitation rate of the oil phase is the lowest (< 10%), and the demulsification voltage value is the highest. The emulsion breaking voltage of the emulsion stabilized by the hydrophilic nano silicon dioxide (original nano particles, contact angle less than 40 ℃) and the organic soil is lower than 400V, the precipitation rate is more than 20%, and the stability of the emulsion is poor. The emulsion breaking voltage of the emulsion stabilized by the Hydrophobic nano-silica (commercially available Hydrophobic gas phase nano-silica Hydrophobic-260 type Aradin with the contact angle more than or equal to 150 ℃) and organic soil is lower than 400V, the precipitation rate is more than 20%, and the stability of the emulsion is poor.
The optical microscope of the emulsion formed in the step (2) of this example after aging at 200 ℃ shows that the droplet size is smaller and more uniform, and the emulsion stability is significant, as shown in fig. 5.
Example 21
Research on temperature resistance of organic soil, nano-silicon dioxide and composite plugging agent synergistically stabilized emulsion
The inventor researches to find that the amphiphilic silica nanoparticles (example 7) and the modified organic soil (example 1) are adopted according to the following formula 2: 1, and the Pickering water-in-oil emulsion prepared by the oil-water ratio of 60:40 has good thermal stability.
As shown in figure 6, after the Pickering emulsion is aged at the temperature of 150-240 ℃ and hot-rolled for 16 hours, the precipitation rate of the oil phase is lower than 25%, and the precipitated oil phase can disappear by simple shaking. The demulsification voltage values of the emulsion are all higher than 400V, which indicates that the Pickering emulsion still has good thermal stability under the high-temperature condition. And the emulsion is independently stabilized by the organic soil, the precipitation rate of an oil phase after aging exceeds 30 percent, the demulsification voltage after aging is lower than 300V, and the emulsion has poor emulsification stability. Therefore, the synergistic stabilizing effect of the organic soil and the amphiphilic nano silicon dioxide is shown, and the temperature resistance of the emulsion is improved. Under the synergistic effect of the organic soil, the amphiphilic nano-silica and the composite plugging agent, the precipitation rate of the oil phase of the drilling fluid is lower, the demulsification voltage is higher, and the emulsifying performance of the emulsion is improved.
TABLE 3 rheological parameters of 3 wt% nanoparticles synergistically stabilized emulsions with 1 wt% organoclay at different aging temperatures
From table 3, it can be seen that the yield stress and consistency index of the drilling fluid are reduced before aging after the pickering emulsion prepared from the modified organic soil and the hydrophobic nanoparticles is aged at 200 ℃, which indicates that the rheological property of the drilling fluid is reduced after aging at 200 ℃. After the Pickering emulsion prepared from the modified organic soil and the amphiphilic nanoparticles is aged for 16 hours at the temperature of 120-240 ℃, the yield stress and the consistency index are increased along with the increase of the temperature, and the flow pattern index n value is reduced, which indicates that the shearing dilutability of the emulsion is stronger. It shows that under the condition of high temperature, the nano silicon dioxide particles are mixed with the organic soil to form a rigid film to prevent the coalescence of liquid drops. And the interaction between the particle emulsifier and the oil phase medium is enhanced by the synergistic effect of the amphiphilic nano silicon dioxide particles and the organic soil, and the stronger the spatial network structure strength is (the higher the yield stress is). Under the action of the modified organic soil, the amphiphilic nano-particles and the composite plugging agent, the yield stress and the consistency index of the drilling fluid are higher, and the reduction of the aging rheological parameter is small, so that the drilling fluid has a stronger space network structure and better temperature resistance under the synergistic action of the modified organic soil, the amphiphilic nano-particles and the composite plugging agent.
Therefore, in the emulsion of the invention, the organic soil forms a stronger space network structure in the continuous phase due to the excellent swelling and peeling of the organic soil in the oil phase, and the amphiphilic nanoparticles and the composite blocking agent further promote the strength of the space network structure. Therefore, the emulsion still has good rheological property even after being hot rolled at 240 ℃. The preparation and high temperature resistance of the pickering emulsion without any surfactant lays a foundation for the application of the pickering emulsion in the drilling fluid of high-temperature deep wells.
Example 22
High temperature resistant Pickering emulsion drilling fluid.
Experiments are carried out on the high-temperature resistant Pickering drilling fluid prepared by the embodiment of the invention, and the experimental method and the experimental results are as follows.
Example 13 was formulated to have a density of 2.0g/cm3The performance of the high-temperature resistant Pickering drilling fluid is measured by roll aging for 16h at 220 ℃ and is shown in Table 4.
Table 4 performance of the high temperature resistant pickering drilling fluid of example 13 before and after aging at 220 ℃
Example 14 was formulated to have a density of 2.4g/cm3The performance of the high-temperature resistant Pickering drilling fluid is measured by roll aging for 16h at 240 ℃ and is shown in Table 5.
TABLE 5 Performance of the high temperature resistant Pickering drilling fluid of example 14 before and after aging at 240 deg.C
Example 15 was formulated to have a density of 1.0g/cm3The performance of the high-temperature resistant Pickering drilling fluid after being subjected to hot rolling aging for 16 hours at the temperature of 100 ℃ is shown in Table 6.
TABLE 6 Performance of the high temperature resistant Pickering drilling fluid of example 15 before and after aging at 100 ℃
Example 12 was formulated to have a density of 1.6g/cm3The performance of the high temperature resistant Pickering drilling fluid after being subjected to hot rolling aging for 16h at 180 ℃ is shown in Table 7.
TABLE 7 Performance of the high temperature resistant Pickering drilling fluid of example 12 before and after aging at 180 ℃
Example 18 was formulated to have a density of 2.6g/cm3The performance of the high temperature resistant Pickering drilling fluid after being subjected to hot rolling aging for 16h at the temperature of 240 ℃ is shown in Table 8.
TABLE 8 Performance of the high temperature resistant Pickering drilling fluid of example 18 before and after aging at 240 deg.C
The tests show that the density of the prepared polymer is 1.0-2.6 g/cm under the conditions of no molecular emulsifier and no shear agent3The Pickering emulsion type high-temperature-resistant drilling fluid has outstanding performance. After 100-240 ℃ hot rolling aging, the drilling fluid meets the drilling fluid requirement of a high-temperature deep well, the rheological property is outstanding, the filtration loss is low, and the acid solubility of a filter cake is good.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The composition of the high-temperature-resistant Pickering emulsion drilling fluid is characterized in that: the composition comprises the following components in parts by weight: oil phase: 30-70 parts of a solvent; modified organic soil: 0.5-4 parts; amphiphilic nano-material: 0.1-4 parts; compounding a plugging agent; 0.5-3 parts; weighting material: 0 to 2000 parts.
2. The composition of claim 1, wherein the high temperature resistant pickering emulsion drilling fluid comprises: the modified organic soil is hydrophobic modified organic soil prepared by the cation exchange reaction of clay and organic ammonium surfactant.
3. The composition of high temperature resistant pickering emulsion drilling fluid of claim 1 or 2, wherein: the amphiphilic nano material comprises at least one of amphiphilic nano silicon dioxide, amphiphilic nano aluminum oxide, amphiphilic nano zinc oxide, amphiphilic nano titanium oxide, amphiphilic nano zirconium oxide, amphiphilic nano magnesium oxide, amphiphilic nano zirconium oxide, amphiphilic nano ferroferric oxide, amphiphilic nano tin oxide and amphiphilic nano manganic manganous oxide.
4. The composition of claim 3, wherein the high temperature resistant Pickering emulsion drilling fluid comprises: the amphiphilic nano material is amphiphilic nano silicon dioxide.
5. The composition of claim 4, wherein the high temperature resistant Pickering emulsion drilling fluid comprises: the preparation method of the amphiphilic nano-silica comprises the following steps:
(1) silanizing nano silicon dioxide with silane coupling agent, dispersing in paraffin at certain temperature, lowering temperature to fix nano silicon dioxide particles at paraffin-water interface, and drying;
(2) dispersing the dried and solidified paraffin emulsion drops into a hydrophobic monomer solution for reaction, filtering out the paraffin emulsion drops after the reaction is finished, and dissolving off the paraffin after washing to obtain hydrophobic modified nanoparticles;
(3) dispersing the hydrophobic modified nano-particles into hydrophilic monomers for reaction, and obtaining the amphiphilic nano-particles after the reaction is finished.
6. The composition of claim 1, wherein the high temperature resistant pickering emulsion drilling fluid comprises: the composite plugging agent comprises the following components in parts by weight: 10-100 parts of hydrophobic nano particles, 1-50 parts of high-temperature resistant bridging particles, 0.1-10 parts of a cross-linking agent, 1-50 parts of expandable particles, 0-200 parts of a suspension, 1-50 parts of fibrous particles, 1-50 parts of deformable particles, 1-40 parts of rigid sheet materials and 0.01-20 parts of a surfactant.
7. The composition of claim 6, wherein the high temperature resistant Pickering emulsion drilling fluid comprises: the preparation method of the composite plugging agent comprises the following steps: sequentially adding the deformable particles and the expandable particles into the suspension, uniformly mixing at 120-200 ℃, adding the surfactant, uniformly mixing, sequentially adding the cross-linking agent, the fibrous particles, the hydrophobic nano-particles, the high-temperature-resistant bridging particles and the rigid flaky material, and stirring at constant temperature for 1-6 hours. Standing, layering, filtering, vacuum drying at 150-200 ℃, crushing, and sieving with a 10-50 mesh sieve.
8. The composition of the high temperature resistant pickering emulsion type drilling fluid according to any one of claims 1 to 7, wherein: the composition further comprises: fluid loss additive: 0.5-5 parts; alkalinity regulator: 0-5 parts; wetting agent: 0 to 3 parts.
9. The high-temperature-resistant Pickering emulsion type drilling fluid is characterized by comprising the following components in parts by weight: comprising a composition according to any one of claims 1 to 8 and an aqueous phase.
10. The preparation method of the high temperature resistant Pickering emulsion type drilling fluid of claim 9, which is characterized in that: the method comprises the following steps: preparing materials according to the formula of the components of the high-temperature-resistant Pickering emulsion type drilling fluid; pouring the modified organic soil into the oil phase, and stirring at 6000-12000 rpm for 10-30 minutes; then adding the amphiphilic nano material, stirring for 10 minutes to 1 hour at the speed of 6000rpm to 12000rpm, and then stirring for 0 hour to 24 hours at the low speed of 100rpm to 1000 rpm; then adding the water phase to emulsify for 30 minutes at the speed of 8000 rpm-12000 rpm, adding the rest components, and uniformly mixing to obtain the finished product.
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