CN115627157A - Application of high-nitrogen-doped graphene nanosheet in oil-based drilling fluid - Google Patents
Application of high-nitrogen-doped graphene nanosheet in oil-based drilling fluid Download PDFInfo
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Abstract
The invention belongs to the technical field of oil and gas field drilling, and particularly relates to an application of high-aza-graphene nanosheets in oil-based drilling fluid, wherein the high-aza-graphene nanosheets are added into the oil-based drilling fluid, and a preparation method of the high-aza-graphene nanosheets comprises the following steps: s1, premixing raw materials of inorganic salt, a carbon-containing compound and a nitrogen-containing organic compound; and S2, carrying out pyrolysis on the premixed raw material to obtain a high nitrogen-doped graphene nanosheet with the nitrogen atom content of about 3.5-8% on the surface of the overall material, wherein the nitrogen atom structure of the high nitrogen-doped graphene material mainly comprises pyridine nitrogen, pyrrole nitrogen, graphitized nitrogen and aminated nitrogen. The field experiment shows that the nitrogen atom content of the graphene and the synergistic lubrication plugging efficiency of the drilling fluid are in positive correlation.
Description
Technical Field
The invention belongs to the technical field of oil and gas field drilling, and particularly relates to an application of high nitrogen-doped graphene nanosheets in an oil-based drilling fluid.
Background
The exploration and development of the conventional oil and gas resources in China are more and more difficult, the resource quality is more and more poor, and the oil and gas resources such as complex oil and gas reservoirs, unconventional oil and gas reservoirs, residual oil and gas potential excavation and deep strata and the like become the key fields of the oil and gas exploration and development in China. Taking the southwest work area developed by the oil and gas division company of the southwest of China petrochemical industry as an example, the mining right area spans provinces such as Sichuan, chongqing, yunnan and Guizhou, the drilling construction faces a plurality of difficulties, the scope is wide, the construction difficulty is high, and the like, so that the main battlefield of exploration and development after 2018 turns to the Weirong shale gas and the West gas field, and the drilling footage of the Weirong shale gas and the West gas field is greatly improved. Meanwhile, horizontal wells, ultra-deep wells and edge exploratory wells are increased year by year, the average drilling depth is gradually increased, and the average drilling depth is over 4000 meters in 2022 years. However, the current state of the art in petroleum engineering greatly limits the efficient exploitation of the above oil and gas resources. Therefore, a new technical idea needs to be found, and the unique mechanical, electrical and optical properties of the graphene and the derivatives thereof enable the graphene and the derivatives thereof to have great potential application values in the aspects of geophysical exploration, well drilling and completion, well cementation, recovery efficiency improvement and the like, so that the new technical idea is provided for efficient development of oil and gas resources.
At present, along with the exploitation of long horizontal wells, deep wells and ultra-deep wells, the requirement on the plugging lubricity of a drilling fluid system is higher and higher, the plugging lubricity of the existing drilling fluid system at home and abroad basically meets the existing drilling requirement, but in the drilling process of some new blocks, the problems of instability of the well wall of a lower stratum, later pressure supporting of the horizontal well and the like still exist by using the oil-based drilling fluid, so that the drilling cycle and the well completion cycle are prolonged, and therefore, a new oil-based drilling fluid technology is needed to be developed to solve the problems of instability of the well wall of the stratum, pressure supporting of the horizontal well, high friction resistance and the like. In view of the above, by developing and applying the graphene plugging lubricant for drilling fluid to an oil-based drilling fluid system, the graphene plugging lubricant can be adsorbed to the surface of a well wall and embedded into formation micro cracks to form an ultra-low permeability sealing layer, so that the lubricating property of the drilling fluid is improved, the graphene drilling fluid plugging lubricating system applied to a complex formation is formed, the occurrence of drilling complex accidents is reduced, the accident handling time is prolonged, the cost reduction and the efficiency improvement are realized, and the graphene plugging lubricant has great significance for stable production and acceleration of gas field development.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an application of a high-nitrogen-doped graphene nanosheet in an oil-based drilling fluid.
The purpose of the invention is realized by the following technical scheme: the application of the high-nitrogen-doped graphene nanosheet in the oil-based drilling fluid is characterized in that the high-nitrogen-doped graphene nanosheet is added into the oil-based drilling fluid, and the nitrogen atom content of the surface of the integral material of the high-nitrogen-doped graphene nanosheet is about 3.5-8%, preferably 4-6%.
The preparation method of the high-nitrogen-doped graphene nanosheet comprises the following steps:
s1, premixing raw materials of inorganic salt, a carbon-containing compound and a nitrogen-containing organic compound;
wherein the inorganic salt is one or more of soluble halide, nitrate, sulfate, sodium salt and potassium salt; the carbon-containing compound comprises one or more of phthalic anhydride and derivatives thereof, organic acid anhydride compounds and sugar compounds, wherein the sugar compounds comprise glucose and sucrose; the nitrogen-containing organic compound comprises urea and a nitrogen atom-containing metal organic compound, and the nitrogen atom-containing metal organic compound is a phthalocyanine compound or a porphyrin compound;
further, the phthalic anhydride and the derivatives thereof are preferably phthalic anhydride;
the organic acid anhydride compound is an organic acid anhydride, and is usually carboxylic anhydride, hydroxy acid anhydride or keto acid anhydride, preferably acetic anhydride, phthalic anhydride, lactic anhydride or acetone anhydride;
the phthalocyanine compound is copper phthalocyanine, nickel phthalocyanine, zinc phthalocyanine, cobalt phthalocyanine, iron phthalocyanine, or the like, and preferably copper phthalocyanine or iron phthalocyanine.
The porphyrin compound is a complex nitrogen-containing compound based on the structure of four pyrrole cores which are closed into a ten J six-ring.
S2, carrying out pyrolysis on the premixed raw material to obtain the high nitrogen-doped graphene nanosheet, wherein the pyrolysis temperature range is 600-1200 ℃, and the pyrolysis time is 3-12h.
Further, in step S1, the molar ratio of the inorganic salt, the carbon-containing compound, and the nitrogen-containing organic compound is 10 to 1000:0.1 to 10, preferably 100.
Further, the high aza-graphene nanosheets obtained in step S2 need to be washed and dried to remove inorganic salts in the high aza-graphene nanosheets.
Further, the high aza graphene nano sheet is added into the oil-based drilling fluid after being prepared into high aza graphene nano sheet water-based slurry, and the preparation method of the high aza graphene nano sheet water-based slurry comprises the following steps: and crushing the high nitrogen-doped graphene nanosheets to 7-8 microns, mixing the crushed high nitrogen-doped graphene nanosheets with water, and performing ball milling until the particle size D50 ranges from 100 nm to 500nm.
Further, the device for crushing the high nitrogen-doped graphene nanosheets to 7-8 microns is an airflow crusher.
Furthermore, the mass ratio of the crushed high-nitrogen-doped graphene nanosheets to water is 1.
Further, the ball milling conditions range from: grinding zirconium beads with the particle size of 3-8 mm; the ball milling time is 2 to 8 hours.
Further, the oil-based drilling fluid is a white oil-based drilling fluid.
Further, the formulation of the white oil based drilling fluid is (oil to water ratio, white oil: 25% cacl brine =80: white oil +25% CaCl saline +0.8% Primary emulsion +1.5% auxiliary emulsion +1.0% wetting agent +3.0% organic soil +3.0% CaO +8.0% filtrate reducer +3.0% plugging agent for drilling fluid (FDM-1) + add weight to 2.2g/cm 3 。
Further, the addition amount of the high nitrogen-doped graphene nanosheets accounts for 0.5-2% of the mass of the oil-based drilling fluid.
The beneficial effects of the invention are:
1. according to the invention, compounds such as inorganic salts are added in the graphene preparation process, so that the graphene nanosheet with high nitrogen content is successfully prepared. The nitrogen atom structure of the high-nitrogen-content graphene material mainly comprises pyridine nitrogen, pyrrole nitrogen, graphitized nitrogen and aminated nitrogen. The high nitrogen content means that the nitrogen atom content on the surface of the whole material is about 3.5-8%, and is different from the low nitrogen content of a common aza-graphene material by 1-3%, and the field experiment shows that the nitrogen atom content of the graphene and the synergistic lubrication plugging efficiency of the drilling fluid are in a positive correlation relationship.
2. The high-nitrogen-doped graphene nanosheet water-based slurry prepared by the invention is matched with drilling fluid for use, and is used for shale stratum with high lubricity and strong plugging property. The high lubricity comes from the interlayer slippage of the graphene nanosheet layer; the strong blocking inhibition property comes from the synergistic effect of the electron adsorption property of the high-nitrogen-content aza-graphene material and the drilling fluid, and the nitrogen content, the lamella size and the compounding capability of the aza-graphene and the drilling fluid determine the final blocking and lubricating property of the novel drilling fluid, and the strong blocking inhibition property and the high lubricity are suitable for the requirements of shale gas exploration and development and the like.
Drawings
FIG. 1 is a TEM spectrogram of an aza-graphene material of the invention;
FIG. 2 is an XRD spectrum of aza-graphene at different cracking temperatures.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following descriptions.
1. Experimental equipment
The stirrer: asymmetric cantilever cone mixer model DSH-0.5, volume 0.5m 3 The motor power is 4Kw, and the contact part of the motor and the material is made of stainless steel.
Vibrating a grading screen: the BY800-3S three-dimensional vibrating classifying screen has the screen surface effective diameter of 800 and the motor power of 1.1Kw, and the part in contact with materials is made of stainless steel.
Vacuum atmosphere tube furnace: the model is as follows: LYL-12GL-100/X.
Ball mill: QHJM ultra-fine stirring mill (cylinder volume 500L, motor power 22 Kw). The apparatus can grind the material to 1 micron or finer.
A centrifuge: the ZJ-1000 horizontal spiral discharging settling centrifuge is a continuously operated centrifuge which utilizes the settling principle to separate suspension. Can continuously feed, settle and separate solid and liquid when running at full speed.
Drying equipment: ZKG type vacuum rake dryer is a novel horizontal intermittent vacuum drying equipment, wet material is evaporated by conduction, a scraper stirrer is provided to continuously remove the material on the hot surface and is pushed in a container to form a circulating flow, and the water is pumped out by a vacuum pump after being evaporated.
An airflow crusher: the LQF-100 fluidized bed type airflow crusher has material fluidizing under the action of high speed compressed jet flow after entering the crushing chamber, accelerated material converging and crushing at the meeting point of the nozzles, crushed fine powder moving to the classifying chamber and exhausting the fine powder from the exhaust port.
2. Preparation of high-nitrogen-doped graphene nanosheet and aqueous slurry
Example 1
(1) Preparation of high-nitrogen-doped graphene nanosheet
Adding inorganic salt (industrial-grade sodium chloride), carbon-containing compound (cane sugar) and nitrogen-containing organic compound (phthalocyanine nickel and urea) into a stirrer for premixing, wherein the ratio of the inorganic salt to the carbon-containing compound to the nitrogen-containing organic compound is 100:1:1, after mixing evenly, use the vibration classifying screen to carry out preliminary crushing, pack into the porcelain boat of a certain size with the mixture after smashing and pave, then put into the tube furnace, under the argon atmosphere, the room temperature condition fully exchanges gaseous 2h, then carries out high temperature calcination according to the procedure of rising the temperature as follows: heating to 300 ℃ at the heating rate of 5 ℃/min, then preserving heat for 1h, heating to 350 ℃ at the heating rate of 5 ℃/min, and preserving heat for 1h; then raising the temperature to 400 ℃ at the speed of 5 ℃/min and preserving the heat for 1h, raising the temperature to 500 ℃ at the speed of 3 ℃/min and preserving the heat for 4h, and finally raising the temperature to 600 ℃ at the speed of 2 ℃/min and preserving the heat for 8h. And then cooling to room temperature, closing the tube furnace and the gas valve, taking out the sample, washing and drying (drying at 80 ℃ in drying equipment) to obtain the 600 ℃ aza graphene powder nanosheet, which is named as G600.
(2) Preparation of high-nitrogen-doped graphene nanosheet water-based slurry
Weighing a certain amount of the aza-graphene powder material G600, finely crushing for 1h by using an airflow crusher, enabling the particle size of the crushed graphene nanosheet to be about 7-8 microns, mixing the powder material with distilled water, feeding the mixture according to the mass ratio of 1.
Example 2
(1) Preparation of high-nitrogen-doped graphene nanosheet
Adding inorganic salt (industrial-grade sodium sulfate), a carbon-containing compound (phthalic anhydride) and a nitrogen-containing organic compound (porphyrin and urea) into a stirrer for premixing, wherein the ratio of the inorganic salt to the carbon-containing compound to the nitrogen-containing organic compound is 100:1:1, after mixing evenly, use the vibration classifying screen to carry out preliminary crushing, pack into the porcelain boat of a certain size with the mixture after smashing and pave, then put into the tube furnace, under the argon atmosphere, the room temperature condition fully exchanges gaseous 2h, then carries out high temperature calcination according to the procedure of rising the temperature as follows: heating to 300 ℃ at the heating rate of 5 ℃/min, then preserving heat for 1h, heating to 350 ℃ at the heating rate of 5 ℃/min, and preserving heat for 1h; then raising the temperature to 400 ℃ at the speed of 5 ℃/min and preserving the heat for 1h, raising the temperature to 500 ℃ at the speed of 3 ℃/min and preserving the heat for 4h, and finally raising the temperature to 700 ℃ at the speed of 2 ℃/min and preserving the heat for 8h. And then cooling to room temperature, closing the tube furnace and the gas valve, taking out the sample, washing and drying (drying at 80 ℃ in drying equipment) to obtain the nitrogen-doped graphene powder nanosheet at 700 ℃, which is named as G700.
(2) Preparation of high-nitrogen-content graphene nanosheet water system slurry
Weighing a certain amount of the aza-graphene powder material G700, finely crushing for 1h by using an airflow crusher, mixing the crushed graphene nanosheets with 7-8 microns in particle size, feeding the mixture into a ball mill according to the mass ratio of 1.
Example 3
(1) Preparation of high-nitrogen-doped graphene nanosheet
Adding inorganic salt (industrial potassium nitrate), a carbon-containing compound (acetic anhydride) and a nitrogen-containing organic compound (iron phthalocyanine and urea) into a stirrer for premixing, wherein the ratio of the inorganic salt to the carbon-containing compound to the nitrogen-containing organic compound is 100:1:1, after the uniform mixing, primarily crushing by using a vibration classifying screen, filling the crushed mixture into a porcelain boat with a certain size, paving, then putting into a tube furnace, fully exchanging gas for 2h under the room temperature condition in the argon atmosphere, and then carrying out high-temperature calcination according to the following temperature rise program: heating to 300 ℃ at the heating rate of 5 ℃/min, then preserving heat for 1h, heating to 350 ℃ at the heating rate of 5 ℃/min, and preserving heat for 1h; then raising the temperature to 400 ℃ at the speed of 5 ℃/min and preserving heat for 1h, raising the temperature to 500 ℃ at the speed of 3 ℃/min and preserving heat for 4h, and finally raising the temperature to 800 ℃ at the speed of 2 ℃/min and preserving heat for 8h. And then cooling to room temperature, closing the tube furnace and the gas valve, taking out the sample, washing and drying (drying at 80 ℃ in drying equipment) to obtain the 800 ℃ aza graphene powder nanosheet, which is named as G800.
(2) Preparation of high-nitrogen-doped graphene nanosheet water-based slurry
Weighing a certain amount of the aza-graphene powder material G800, finely crushing for 1h by using an airflow crusher, enabling the particle size of the crushed graphene nanosheet to be about 7-8 microns, mixing the powder material with distilled water, feeding the mixture according to the mass ratio of 1.
Example 4
(1) Preparation of high-nitrogen-doped graphene nanosheet
Adding an inorganic salt (industrial-grade potassium chloride), a carbon-containing compound (phthalic anhydride) and a nitrogen-containing organic compound (copper phthalocyanine and urea in a mass ratio of 1: 1:1, after mixing evenly, use the vibration classifying screen to carry out preliminary crushing, pack into the porcelain boat of a certain size with the mixture after smashing and pave, then put into the tube furnace, under the argon atmosphere, the room temperature condition fully exchanges gaseous 2h, then carries out high temperature calcination according to the procedure of rising the temperature as follows: heating to 300 ℃ at the heating rate of 5 ℃/min, then preserving heat for 1h, heating to 350 ℃ at the heating rate of 5 ℃/min, and preserving heat for 1h; then raising the temperature to 400 ℃ at the speed of 5 ℃/min and preserving the heat for 1h, raising the temperature to 500 ℃ at the speed of 3 ℃/min and preserving the heat for 4h, and finally raising the temperature to 900 ℃ at the speed of 2 ℃/min and preserving the heat for 8h. And then cooling to room temperature, closing the tube furnace and the gas valve, taking out the sample, washing and drying (drying at 80 ℃ in drying equipment) to obtain the 900 ℃ aza graphene powder nanosheet, which is named as G900.
(2) Preparation of high-nitrogen-doped graphene nanosheet water-based slurry
Weighing a certain amount of the aza-graphene powder material G900, finely crushing for 1h by using an airflow crusher, mixing the crushed graphene nanosheets with 7-8 microns in particle size, feeding the mixture into a ball mill according to the mass ratio of 1.
And (3) respectively measuring the particle size, the nitrogen content and the thickness of the graphene sheet layer in the product by using the prepared high-nitrogen-doped graphene nanosheet water system slurry, wherein the measuring methods are methods such as a laser particle size analyzer, an EDS (electronic EDS) method, a scanning electron microscope method and the like.
The experimental results are given in the following table:
| item | Nitrogen content (%) | Thickness (nm) | Particle size D50 (nm) |
| Example 1 | 4.0 | 42.4 | 496 |
| Example 2 | 3.8 | 31.5 | 316 |
| Example 3 | 4.2 | 12.7 | 302 |
| Example 4 | 3.9 | 21.4 | 352 |
3. Influence of high-nitrogen-doped graphene nanosheet water-based slurry on oil-based drilling fluid
Oil-based drilling fluid (oil-to-water ratio, white oil: 25% cacl brine = 80) base slurry formulation: white oil +25% CaCl brine +0.8% Primary milk +1.5% Secondary milk +1.0% wetting agent +3.0% organic soil +3.0% CaO +8.0% Filter loss additive +3.0% plugging agent for drilling fluids (FDM-1) + add up to 2.2g/cm 3 。
(1) Evaluation of conventional Properties
Testing the second part of the oil and gas industry drilling fluid on site according to GB/T16783.1-2014/ISO10414-1: according to the testing method in the oil-based drilling fluid, graphene with different proportions is added into the base slurry of the oil-based drilling fluid, the performance of the drilling fluid before and after aging for 16 hours at 150 ℃ is tested (conventional performance test 65 ℃), and the experimental results are shown in Table 1.
Formula 1: base slurry +0.5% aza-graphene (high aza-graphene prepared according to inventive example 3)
And (2) a formula: base slurry +1% aza-graphene (high aza-graphene prepared according to inventive example 3)
And (3) formula: base slurry +0.5% unmodified graphene (ordinary graphene)
Table 1 impact of nano-graphene on conventional performance of oil-based drilling fluids
Note: wherein FL API Is water loss at normal temperature and pressure, FL HTHP For water loss at high temperature and high pressure, gel is static shear, AV is apparent viscosity, PV is plastic viscosity, and YP is dynamic shear.
From the table it follows: compared with the formula 1 and the formula 3, the drilling fluid rheological property of the aza-graphene is superior to that of unmodified graphene, the high-temperature and high-pressure filtration loss is reduced more, the demulsification voltage is stable, and the static shear Gel data show that the drilling fluid still has a stronger structure after aging, so that the gelation force of the oil-based drilling fluid can be enhanced after the graphene is aged for 16 hours at the high temperature of 150 ℃, and the temperature resistance is good; compared with the formula 2, the formula 1 has no influence on the rheological property of the drilling fluid along with the increase of the addition of the aza-graphene, the high-temperature and high-pressure filtration loss is gradually reduced, the filtration loss of 1 percent of the aza-graphene is the lowest and is 2.6ml, and the demulsification voltage is stable.
(2) Evaluation of lubricity
According to a method specified by SY/T6094-94 & ltevaluation procedure of lubricants for drilling fluids & gt, an EP extreme pressure lubrication instrument is adopted to test the lubrication coefficient K before and after the drilling fluid is added with the lubricants, and the calculation formula is as follows:
in the formula: dz, ds are readings of drilling fluid and water on the instrument tray, respectively.
The graphene with different proportions is added into the oil-based drilling fluid base slurry, the lubricating performance after aging for 16 hours at 150 ℃ is tested (the conventional performance test is 65 ℃), and the experimental results are shown in table 2.
Table 2 effect of nano graphene on lubricating performance of oil-based drilling fluids
| Formulation(s) | Conditions of the experiment | Coefficient of lubricity |
| Base pulp | Aging at 150 deg.C for 16h | 0.161 |
| Base slurry +0.5% aza-graphene | Aging at 150 deg.C for 16h | 0.148 |
| Base slurry +1% aza-graphene | Aging at 150 deg.C for 16h | 0.0845 |
| Base slurry +0.5% unmodified graphene | Aging at 150 deg.C for 16h | 0.152 |
As can be seen from table 2, compared with unmodified graphene, the aza-graphene has a lower lubrication coefficient and a higher lubrication performance than unmodified graphene, and with the increase of the amount of the aza-graphene, 1% of the aza-graphene has the best lubrication performance, and the lubrication coefficient is reduced by about 50%, which indicates that the graphene has excellent lubrication performance, and can solve the problems of pressure holding and borehole wall instability of the oil-based drilling fluid during the construction process.
(3) Evaluation of plugging Property
Simulating the underground static filtration condition by using a drilling fluid hypotonic sand table plugging performance evaluation instrument (TCH-PPA) under a high-temperature and high-pressure state to predict the capability of the drilling fluid for forming a semipermeable filter cake, and obtaining the plugging performance of the drilling fluid by observing the aging time of a sample in the drilling fluid and the filtration loss in a certain time. A sand plate with a pore size of 40 μm was selected and the density was examined at 150 ℃ and 1014psi (6 MPa) to 2.2g/cm 3 The plugging performance of the drilling fluid within 30min is measured after aging at 150 ℃/16h under the condition that the addition of graphene is 0.5% and 1%, and the experimental results are shown in table 3.
TABLE 3 evaluation of drilling fluid plugging Performance (PPA sand disc)
As can be seen from the table, the fluid loss of the oil-based drilling fluids increased gradually with increasing assay time after aging at 150 ℃/16 h. The filtration loss is reduced by adding the graphene into the base slurry, and in addition, compared with unmodified graphene, the filtration loss of the aza-graphene is lower, which shows that the blocking performance of the aza-graphene is superior to that of the unmodified graphene.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and is not to be construed as limited to the exclusion of other embodiments, and that various other combinations, modifications, and environments may be used and modifications may be made within the scope of the concepts described herein, either by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The application of the high nitrogen-doped graphene nanosheets in the oil-based drilling fluid is characterized in that the high nitrogen-doped graphene nanosheets are added into the oil-based drilling fluid, and the nitrogen atom content of the surface of the integral material of the high nitrogen-doped graphene nanosheets is 3.5-8%.
2. The use according to claim 1, wherein the preparation method of the high aza graphene nanoplatelets comprises the following steps:
s1, premixing raw materials of inorganic salt, a carbon-containing compound and a nitrogen-containing organic compound;
wherein the inorganic salt is one or more of soluble halide, nitrate, sulfate, sodium salt and potassium salt; the carbon-containing compound comprises one or more of phthalic anhydride and derivatives thereof, organic acid anhydride compounds and saccharide compounds; the nitrogen-containing organic compound comprises urea and a nitrogen atom-containing metal organic compound, and the nitrogen atom-containing metal organic compound is a phthalocyanine compound or a porphyrin compound;
s2, carrying out pyrolysis on the premixed raw material to obtain the high-nitrogen-doped graphene nanosheet, wherein the pyrolysis temperature range is 600-1200 ℃, and the pyrolysis time is 3-12h.
3. The use according to claim 2, wherein in step S1, the molar ratio of the inorganic salt to the carbon-containing compound to the nitrogen-containing organic compound is 10 to 1000: 0.1-10 parts by weight.
4. The use of any one of claims 1 to 3, wherein the high aza graphene nanoplatelets are prepared as an aqueous slurry of high aza graphene nanoplatelets and then added to the oil-based drilling fluid, and the aqueous slurry of high aza graphene nanoplatelets is prepared by: and crushing the high nitrogen-doped graphene nanosheets to 7-8 microns, mixing the crushed high nitrogen-doped graphene nanosheets with water, and performing ball milling until the particle size D50 ranges from 100 nm to 500nm.
5. The use according to claim 4, wherein the equipment used to crush the high aza graphene nanoplatelets to 7-8 microns is a jet mill.
6. The use of claim 4, wherein the mass ratio of the crushed high-nitrogen-doped graphene nano sheets to water is 1.
7. The use according to claim 4, wherein the ball milling conditions are in the range of: grinding zirconium beads with the particle size of 3-8 mm; the ball milling time is 2 to 8 hours.
8. The use of claim 1, wherein the oil-based drilling fluid is a white oil-based drilling fluid.
9. The use of claim 8 wherein the formulation of the white oil-based drilling fluid is (oil to water ratio, white oil: 25% CaCl brine =80: white oil +25% CaCl saline +0.8% Primary emulsion +1.5% auxiliary emulsion +1.0% wetting agent +3.0% organic soil +3.0% CaO +8.0% filtrate reducer +3.0% plugging agent for drilling fluid (FDM-1) + add weight to 2.2g/cm 3 。
10. The use of claim 1, wherein the amount of the high aza graphene nanoplatelets added is 0.5-2% of the oil-based drilling fluid mass.
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| CN114214047A (en) * | 2022-01-24 | 2022-03-22 | 西南石油大学 | Outer-soft inner-rigid multi-walled carbon nanotube nano plugging agent and oil-based drilling fluid |
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