CN114805670A - Polymer brush lubricant for water-based drilling fluid, preparation method and application - Google Patents
Polymer brush lubricant for water-based drilling fluid, preparation method and application Download PDFInfo
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
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- C09K2208/34—Lubricant additives
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Abstract
The invention provides a polymer brush lubricant for water-based drilling fluid, a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing short-chain acrylate, long-chain acrylate and polar acrylate, uniformly stirring, dissolving in base oil, and adding a molecular weight regulator; adding an initiator in a nitrogen atmosphere to perform reaction; and after the reaction is finished, naturally cooling to room temperature to obtain the polymer brush lubricant for the water-based drilling fluid. The lubricant disclosed by the invention has an efficient lubricating effect in different drilling fluid systems and well slurries, has good compatibility, can resist the ultrahigh temperature of 220 ℃, and still has an excellent lubricating effect after being aged at the ultrahigh temperature; the lubricant is non-toxic, easy to biodegrade, good in environmental protection performance and beneficial to improving the environmental protection performance of the drilling fluid and the sustainable development level of oil-gas exploration and development.
Description
Technical Field
The invention relates to a polymer brush lubricant for water-based drilling fluid, a preparation method and application thereof, belonging to the field of oilfield chemistry in the petroleum industry.
Background
In the field of oil and gas drilling, compared with conventional wells, unconventional wells such as ultra-long horizontal wells, cluster wells, extended reach wells and the like have higher yield, higher recovery rate and wider applicability, so that the number and the specific gravity of the unconventional wells in the oil and gas drilling are increased year by year. These wells are prone to collapse, sticking, balling up during drilling, etc. The problems of high friction resistance and high torque in the drilling process are solved, and the key of the current drilling process is.
At present, the most effective method for reducing the friction resistance and the torque of the drilling fluid is to add a drilling fluid lubricant into the drilling fluid so as to reduce the friction coefficient between a drill pipe, a casing pipe, a drilling tool and a well wall and improve the lubricating property of the drilling fluid. Many types of lubricants exist today, classified by the type of synthetic monomer, and mainly classified as: esters, alcohols, oils, emulsions, and the like. These monomers include low solubility alcohols, fatty acid esters, bio-oils, vegetable oils, and the like.
Drilling fluid lubricants face downhole complications and must be sufficiently stable at high temperatures and capable of performing their lubricating properties. Chinese patent document CN106833557A discloses a method for preparing a lubricant for drilling fluid, which takes vegetable oleic acid, organic solvent, condensing agent and alcohol amine as main reactants, and performs synthetic reaction at a certain temperature and time, so that the formed amide condensation compound containing alcoholic hydroxyl group has a temperature resistance as high as 200 ℃, but the reaction process is long, the experimental steps are complex, and the lubricating effect is poor in an ultrahigh temperature environment.
The polymer brush is also called polymer molecular brush, and the polymer molecular brush is formed by grafting polymer molecular chains on a polymer main chain at high density, so that a polymer with high grafting degree is formed. When the graft density of the branches is large enough, the branches extend outwards from the main chain of the polymer perpendicularly due to steric hindrance, so that the overlapping of the branches is avoided, and the whole polymer molecule forms a configuration similar to a brush and has a random coil conformation different from that of a common polymer chain, so that the physical and chemical properties of the graft polymer are different from those of the common polymer. Polymer brushes can reduce the surface dynamic coefficient of friction by several orders of magnitude compared to surfaces lubricated with oil. The polymer brush can not only bring improvement of drag reduction efficiency, but also bring remarkable improvement of shear stability, but related researches on the application of the polymer brush lubricant in the field of drilling fluid are not reported.
At present, the existing lubricant agent for water-based drilling fluid has the following defects: (1) the high temperature resistance is insufficient, the degradation and failure are easy to occur under the high temperature condition, and the drilling requirement of deep stratum can not be met. (2) The environment-friendly performance is poor, and the drilling requirement of an environment sensitive area can not be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a polymer brush lubricant for water-based drilling fluid, a preparation method and application thereof. The polymer brush lubricant is prepared by polymerizing the acrylate monomer composition, has good performance in ultrahigh-temperature and high-pressure environments, is nontoxic, harmless and environment-friendly, and overcomes the defect of insufficient high-temperature stability of the conventional lubricant for the water-based drilling fluid.
The technical scheme of the invention is as follows:
a preparation method of a polymer brush lubricant for water-based drilling fluid comprises the following steps:
mixing short-chain acrylate, long-chain acrylate and polar acrylate, uniformly stirring, dissolving in base oil, and adding a molecular weight regulator; adding an initiator in a nitrogen atmosphere to perform reaction; and after the reaction is finished, naturally cooling to room temperature to obtain the polymer brush lubricant for the water-based drilling fluid.
According to the invention, the short-chain acrylate is preferably one or the combination of more than two of methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate and propyl-2-methyl-2-acrylate.
According to the invention, the long-chain acrylate is preferably one or a combination of more than two of dodecyl 2-acrylate (LA), octadecyl acrylate and lauryl methacrylate.
According to the invention, the polar acrylate is preferably one or the combination of more than two of hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate and 2-hydroxypropyl methacrylate.
According to the invention, the mass ratio of the short-chain acrylate to the long-chain acrylate to the polar acrylate is preferably 2-10:65-85: 15-35.
According to the invention, the base oil is preferably one or the combination of more than two of mineral oil, synthetic oil and vegetable oil; further preferably, the mineral oil is white oil or liquid paraffin; the synthetic oil is poly alpha olefin or polyester oil; the vegetable oil is coconut oil, soybean oil, cottonseed oil, palm oil or rapeseed oil.
According to the invention, the ratio of the mass of the base oil to the total mass of the short-chain acrylate, the long-chain acrylate and the polar acrylate is preferably 1: 7-9.
Preferably according to the invention, the molecular weight regulator is n-dodecyl mercaptan, diisopropyl xanthogen disulphide or sulphur; the added mass of the molecular weight regulator is 10-20% of the total mass of the short-chain acrylate, the long-chain acrylate and the polar acrylate, and the further optimization is 12-15%.
According to a preferred embodiment of the present invention, the initiator is an azo initiator or a peroxy compound initiator; further preferably, the azo initiator is Azobisisobutyronitrile (AIBN) or azobiscyclohexylcarbonitrile; the peroxide compound initiator is one or more of methyl ethyl ketone peroxide, acetylacetone peroxide, dilauroyl peroxide and tert-butyl isooctanoate peroxide; the adding mass of the initiator is 0.1-1% of the total mass of the short-chain acrylate, the long-chain acrylate and the polar acrylate, and the adding mass is more preferably 0.3-0.5%; the addition temperature of the initiator is 70-75 ℃.
Preferably, according to the invention, the temperature of the reaction is between 70 and 90 ℃; the reaction time is 4-6 h.
The polymer brush lubricant for the water-based drilling fluid is prepared by the preparation method; the number average molecular weight of the polymer brush lubricant for the water-based drilling fluid is 3500-4500.
The invention also provides a water-based drilling fluid, which comprises the polymer brush lubricant for the water-based drilling fluid.
The invention has the following technical characteristics and beneficial effects:
1. the acrylate monomer composition is used for polymerization, the polyacrylate polymer brush lubricant with excellent temperature resistance and high grafting degree is prepared, the introduction of short-chain acrylate enables the obtained lubricant polymer to contain rigid branched chains, the steric hindrance of groups is increased, the temperature resistance of the copolymer can be improved, and the copolymer can have higher stability at high temperature, and experiments prove that the lubricant can resist the high temperature of 220 ℃; the polar acrylate can enhance the adsorption capacity of the copolymer on the surface of the drilling tool and form a polymer film on the surface of the metal; the long chain acrylate can enlarge the adsorption area and provide additional lubricating film strength.
2. The lubricant disclosed by the invention has an excellent lubricating effect, a certain amount of hydroxyl groups are contained in the lubricant molecule, the hydroxyl groups can be effectively adsorbed on the surface of a drilling tool, and a wide and compact film structure is formed on the surface of the drilling tool by combining a polymer brush structure, so that the friction between the drilling tool and rock is effectively reduced, and the excellent lubricating effect is achieved; meanwhile, the long-chain acrylate can enlarge the adsorption area and provide extra lubricating film strength. At normal temperature, 0.5% of the lubricant of the present invention was added to 4% of the base slurry, and the reduction rate of the lubricity coefficient was 90.6%.
3. The lubricant of the invention has good environmental protection performance and EC 50 ＞30000ppm，BOD 5 /COD Cr More than 25%, indicating that it is non-toxic and easily biodegradable. Therefore, the invention not onlyThe method is suitable for drilling deep ultra-deep oil and gas, geothermal wells and environment sensitive areas.
Detailed Description
The present invention is further illustrated by, but not limited to, the following examples.
Meanwhile, the experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents, materials and equipment are commercially available, unless otherwise specified.
Example 1
A preparation method of a polymer brush lubricant for water-based drilling fluid comprises the following steps:
(1) adding 8.0g of No. 5 white oil into a three-neck flask provided with a rotor, a reflux condenser tube and a nitrogen protection device;
(2) 2.0g of methyl methacrylate, 48.0g of 2-dodecyl acrylate and 12.8g of hydroxyethyl acrylate are mixed, stirred uniformly, dissolved in base oil and stirred to obtain a solution;
(3) adding 8.0g of n-dodecyl mercaptan into the prepared solution, and then bubbling the solution with nitrogen; heating to 75 ℃ under the nitrogen atmosphere at the stirring speed of 350 r/min; adding 0.185g of azobisisobutyronitrile into the system, and then reacting for 4 hours at 85 ℃, wherein the stirring speed is 350r/min in the reaction process; and after the reaction is finished, naturally cooling to room temperature to obtain the polymer brush lubricant for the water-based drilling fluid.
The number average molecular weight of the polymer brush lubricant for water-based drilling fluids prepared in this example was 3900.
Example 2
A preparation method of a polymer brush lubricant for water-based drilling fluid comprises the following steps:
(1) adding 8.0g of No. 5 white oil into a three-neck flask provided with a rotor, a reflux condenser tube and a nitrogen protection device;
(2) uniformly mixing and stirring 3.0g of methyl methacrylate, 40.0g of 2-dodecyl acrylate and 14.0g of hydroxyethyl acrylate, dissolving the mixture in base oil, and stirring to obtain a solution;
(3) adding 8.0g of n-dodecyl mercaptan into the prepared solution, and then bubbling the solution with nitrogen; heating to 75 ℃ under the nitrogen atmosphere at the stirring speed of 350 r/min; adding 0.185g of azobisisobutyronitrile into the system, and then reacting for 4 hours at 85 ℃, wherein the stirring speed is 350r/min in the reaction process; and after the reaction is finished, naturally cooling to room temperature to obtain the polymer brush lubricant for the water-based drilling fluid.
Example 3
A preparation method of a polymer brush lubricant for water-based drilling fluid comprises the following steps:
(1) adding 8.0g of No. 5 white oil into a three-neck flask provided with a rotor, a reflux condenser tube and a nitrogen protection device;
(2) 2.0g of methyl methacrylate, 40.0g of 2-dodecyl acrylate and 20.0g of hydroxyethyl acrylate are mixed, stirred uniformly, dissolved in base oil and stirred to obtain a solution;
(3) adding 8.0g of n-dodecyl mercaptan into the prepared solution, bubbling the solution with nitrogen in a nitrogen atmosphere, and heating the solution to 75 ℃ under the condition that the stirring speed is 350 r/min; adding 0.185g of azobisisobutyronitrile into the system, and then reacting for 4 hours at 85 ℃, wherein the stirring speed is 350r/min in the reaction process; and after the reaction is finished, naturally cooling to room temperature to obtain the polymer brush lubricant for the water-based drilling fluid.
Example 4
A polymer brush lubricant for water-based drilling fluids was prepared as described in example 1, except that: in the step (3), the amount of azobisisobutyronitrile added was 0.365 g.
Example 5
A polymer brush lubricant for water-based drilling fluids was prepared as described in example 1, except that: the amount of n-dodecanethiol added in step (3) was 12.0 g.
Comparative example 1
A lubricant for water-based drilling fluids was prepared as described in example 1, except that: in the step (3), n-dodecyl mercaptan is not added.
Comparative example 2
A lubricant for water-based drilling fluids was prepared as described in example 1, except that: the amount of n-dodecylmercaptan added in step (3) was 4.0 g.
Comparative example 3
A lubricant for water-based drilling fluids was prepared as described in example 1, except that: methyl methacrylate is not added in the step (1).
Comparative example 4
A lubricant for water-based drilling fluids was prepared as described in example 1, except that: in the step (1), hydroxyethyl acrylate is not added.
Comparative example 5
A lubricant for water-based drilling fluids was prepared as described in example 1, except that: the amount of dodecyl 2-acrylate added in step (1) was 20.0 g.
Test examples
The lubricants prepared in the examples and comparative examples were evaluated for the following properties:
(1) effect of Polymer Brush Lubricants on the lubricity coefficient of drilling fluids
Preparing bentonite-based slurry: slowly adding 16g of bentonite into 400mL of distilled water while stirring, and then aging for 24h at room temperature to prepare bentonite-based slurry with the mass volume percentage content of 4%.
Preparing a drilling fluid sample: 400mL of the base slurry was taken, 4g of the lubricant product prepared in example and comparative example was added, and stirred at 3000r/min for 20 min.
And (3) performance testing: according to the line standard SY/T6094-94, an extreme pressure lubrication instrument is adopted to determine the lubrication coefficient of the drilling fluid, and the calculation formula is as follows: f ═ N1 × 34)/(100 × N2; in the formula: f is the lubrication coefficient; n1 is the lubrication reading for the drilling fluid; n2 is the clean water lubrication reading and 34 is the correction factor. Then calculating the reduction rate of the lubrication coefficient, wherein the formula is as follows: r ═ f0-f1)/f0 × 100%; in the formula: r is the reduction rate of the lubricating coefficient, f0 is the lubricating coefficient of the drilling fluid before adding the lubricant, and f1 is the lubricating coefficient of the drilling fluid after adding the lubricant. The results are shown in Table 1.
TABLE 1 reduction of lubricity coefficient of drilling fluid lubricants in bentonite-based slurries
As can be seen from Table 1, the samples of the examples have little influence on the viscosity of the base slurry when added thereto, and have high reduction rate of the lubricating coefficient and obvious lubricating effect. The effect on viscosity is slightly less and the lubricating effect is more pronounced than in the comparative examples. Comparing example 1, example 2, example 3 and comparative example 5, it can be seen that when the long-chain acrylate content is higher, the reduction rate of the lubricating coefficient of the sample is slightly higher, the lubricating effect is better, and when the long-chain acrylate content is lower, the performance of the obtained lubricant is poorer; as can be seen from example 4, increasing the amount of initiator added did not improve the lubricity, indicating that the amount of initiator added had less effect on the performance of the lubricant; from comparative examples 1 and 2, it can be seen that the molecular weight of the polymer is too high due to no or too little addition of the molecular weight regulator, resulting in the cross-linking of the reactants and the formation of a gel, and from example 5, it can be seen that the lubricating performance of the sample is slightly lower due to the addition of the molecular weight regulator, rather than that of example 1, indicating that the performance of the lubricant obtained when the molecular weight regulator is added in the preferred range of the present invention is excellent; as can be seen from comparative examples 3 and 4, the lack of short-chain acrylate or polar acrylate causes the great reduction of the lubricating property of the copolymer, indicating that three different acrylates play a key role in improving the lubricating property.
(2) Evaluation results of temperature resistance of lubricant for drilling fluid
Aging treatment of drilling fluid: the reduction rate of the lubricating coefficient of the system after hot rolling at 140 ℃, 180 ℃ and 220 ℃ for 16 hours was measured using a roller heating furnace.
And (3) testing the performance after aging: after aging, stirring for 20min under 3000r/min, testing the reduction rate of the lubrication coefficient according to the standard SY/T6094-94, and the experimental results are shown in Table 2.
TABLE 2 evaluation results of temperature resistance of lubricants for drilling fluids
The temperature resistance test of examples 1, 3 and 4 shows that the reduction rate of the lubrication coefficient is reduced with the increase of the temperature, but all the reduction rates are higher than 70 percent. It can be seen that the example has better lubricating properties at high temperatures, while the best results are example 1. The invention has remarkable effect on resisting the ultra-high temperature lubrication.
(3) Lubricating performance of lubricant for drilling fluid under high density condition
Preparing high-density base slurry: adding 1.5g of low-viscosity carboxymethyl cellulose, 3g of high-temperature resistant modified starch and 580g of barite into 300mL of bentonite-based slurry under stirring, and stirring at high speed (11000r/min) for 30min to obtain the bentonite-based slurry with the density of 2.0g/cm 3 The base slurry of (1).
400mL of the above high-density base slurry was taken, and the lubricants prepared in examples 1 to 5 and comparative examples 2 to 3 were added to the high-density base slurry so that the mass volume percentage content of the lubricant in the high-density base slurry was 1% (4 g of the lubricant was added), and the density and the reduction rate of the lubrication coefficient of the system were measured, and the results are shown in Table 3.
TABLE 3 lubricity coefficient and rate of reduction of lubricity coefficient in high density base slurries with drilling fluid lubricants
The high density resistance tests of examples 1-5 and comparative examples 2-3 were conducted, and it can be seen from Table 3 that the examples had a smaller effect on density when added to a high density base slurry, and the reduction rate of the lubricity coefficient in the high density base slurry was much higher than the standard of not less than 35% for drilling fluid requirements.
(4) Lubricating performance of lubricant for drilling fluid under high-salt condition
Preparing high-salt base slurry: slowly adding 16g of bentonite into 400mL of distilled water while stirring, and then aging for 24h at room temperature to prepare bentonite-based slurry with the mass volume percentage content of 4%; adding NaCl with the mass volume percentage of 5 percent (20g), 15 percent (60g), 25 percent (100g) and 35 percent (140) into the bentonite base slurry with the concentration of 4 percent respectively, and then stirring to obtain base slurries with different concentrations.
The lubricant (8g) prepared in examples 1, 3 and 4 was added to the high-salt-content base slurry, and the mass volume percentage content of the lubricant in the high-salt-content base slurry was 2%, and the density and the reduction rate of the lubrication coefficient of the system were measured, and the results are shown in table 4.
TABLE 4 lubricity coefficient and rate of reduction of lubricity coefficient of drilling fluid lubricants in high salt base slurries
Salt resistance test is carried out on examples 1, 3 and 4, and table 4 shows that the reduction rate of the lubricating coefficient of the sample in the high-salt environment is reduced along with the increase of the salt concentration, and the reduction rate of the lubricating coefficient in 35% high-salt base slurry is still higher, which indicates that the sample has better lubricating effect in the high-salt environment.
(5) Evaluation of biotoxicity
Evaluation of biotoxicity: according to the bio-toxicity tolerance of the oilfield chemical agent and the drilling fluid, if the bio-toxicity test result is not less than 20000mg/L, the bio-toxicity requirement is met. The lubricants prepared in examples 1-5 were subjected to a photobacterium biotoxicity test, and the results are shown in table 5.
TABLE 5 biological Performance test results for drilling fluid lubricants
| Lubricant agent | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| EC50/ppm | 48960 | 45670 | 47820 | 41430 | 40610 |
| Grade of toxicity | Is non-toxic | Is non-toxic | Is non-toxic | Is non-toxic | Is non-toxic |
| BOD5/CODCr | 30.9％ | 29.8％ | 30.5％ | 26.3％ | 27.9％ |
| Degradability | Is easy to degrade | Is easy to degrade | Is easy to degrade | Is easy to degrade | Is easy to degrade |
The EC50 of the products of each example is more than 30000ppm, and BOD5/CODCr is more than 25 percent, which shows that the products are nontoxic, easy to biodegrade and good in environmental protection performance.
The experimental results are combined to show that the ultrahigh temperature resistant lubricant has the remarkable advantages that: firstly, the indoor temperature resistance, salt resistance and high-density effect evaluation are carried out, the lubricating oil has high-efficiency lubricating effect and good compatibility in different drilling fluid systems and well slurry, can resist the ultrahigh temperature of 220 ℃, and still has excellent lubricating effect after being aged at the ultrahigh temperature; secondly, the drilling fluid is non-toxic, easy to biodegrade and good in environmental protection performance, and is beneficial to improving the environmental protection performance of the drilling fluid and the sustainable development level of oil-gas exploration and development.
Claims (10)
1. A preparation method of a polymer brush lubricant for water-based drilling fluid comprises the following steps:
mixing short-chain acrylate, long-chain acrylate and polar acrylate, uniformly stirring, dissolving in base oil, and adding a molecular weight regulator; adding an initiator in a nitrogen atmosphere to perform reaction; and after the reaction is finished, naturally cooling to room temperature to obtain the polymer brush lubricant for the water-based drilling fluid.
2. The method for preparing the polymer brush lubricant for the water-based drilling fluid according to claim 1, wherein the short-chain acrylate is one or a combination of more than two of methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate and propyl-2-methyl-2-acrylate.
3. The method for preparing the polymer brush lubricant for the water-based drilling fluid according to claim 1, wherein the long-chain acrylate is one or a combination of more than two of dodecyl 2-acrylate, octadecyl acrylate and lauryl methacrylate.
4. The method of claim 1, wherein the polar acrylate is one or a combination of more than two of hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate and 2-hydroxypropyl methacrylate.
5. The preparation method of the polymer brush lubricant for the water-based drilling fluid, according to claim 1, is characterized in that the mass ratio of the short-chain acrylate to the long-chain acrylate to the polar acrylate is 2-10:65-85: 15-35.
6. The method for preparing the polymer brush lubricant for the water-based drilling fluid according to claim 1, wherein the base oil is one or a combination of more than two of mineral oil, synthetic oil and vegetable oil; the ratio of the mass of the base oil to the total mass of the short-chain acrylate, the long-chain acrylate and the polar acrylate is 1: 7-9.
7. The method of claim 1, wherein the molecular weight regulator is n-dodecyl mercaptan, diisopropyl xanthogen disulfide, or sulfur; the added mass of the molecular weight regulator is 10-20% of the total mass of the short-chain acrylate, the long-chain acrylate and the polar acrylate, and is preferably 12-15%.
8. The method of preparing a polymer brush lubricant for water-based drilling fluids according to claim 1, wherein the initiator is an azo-based initiator or a peroxy compound-based initiator; preferably, the azo initiator is azobisisobutyronitrile or azobiscyclohexylcarbonitrile; the peroxide compound initiator is one or more of methyl ethyl ketone peroxide, acetylacetone peroxide, dilauroyl peroxide and tert-butyl isooctanoate peroxide; the adding mass of the initiator is 0.1-1% of the total mass of the short-chain acrylate, the long-chain acrylate and the polar acrylate, and preferably 0.3-0.5%; the adding temperature of the initiator is 70-75 ℃;
the reaction temperature is 70-90 ℃; the reaction time is 4-6 h.
9. A polymer brush lubricant for water-based drilling fluid, which is prepared by the preparation method of claim 1.
10. A water-based drilling fluid comprising the polymer brush lubricant for water-based drilling fluids of claim 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115197679A (en) * | 2022-08-26 | 2022-10-18 | 中国石油大学(华东) | High-temperature-resistant fast drilling agent, preparation method thereof and application thereof in water-based drilling fluid |
| CN116426255A (en) * | 2023-04-17 | 2023-07-14 | 中国石油大学(华东) | Microcapsule lubricant and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115197679A (en) * | 2022-08-26 | 2022-10-18 | 中国石油大学(华东) | High-temperature-resistant fast drilling agent, preparation method thereof and application thereof in water-based drilling fluid |
| CN115197679B (en) * | 2022-08-26 | 2024-01-19 | 中国石油大学(华东) | High-temperature-resistant quick drilling agent, preparation method thereof and application thereof in water-based drilling fluid |
| CN116426255A (en) * | 2023-04-17 | 2023-07-14 | 中国石油大学(华东) | Microcapsule lubricant and preparation method and application thereof |
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| CN114805670B (en) | 2023-10-13 |
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