CN105038728A - Temperature-sensitive-type intelligent nano particles used in drilling fluid and preparation method thereof - Google Patents
Temperature-sensitive-type intelligent nano particles used in drilling fluid and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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Abstract
The invention relates to a temperature-sensitive-type intelligent nano particles used in a drilling fluid and a preparation method thereof. In the invention, a silane coupling agent is used for performing ultrasound surface modification to nano SiO2 and a vinyl functional group is introduced. With the surface-modified nano SiO2, a temperature-sensitive-type monomer and a hydrophilic monomer are subjected to a polymerization reaction in a water medium with a co-solvent with addition of an initiator, wherein granularity distribution of the temperature-sensitive-type intelligent nano particles is D10 <= 100 nm, D 50 <= 165 nm and D90 <= 260 nm. When the temperature is higher than a sensitive value, the nano particles achieve double functions of both physical blocking and chemical inhibition, so that a continuous compact hydrophobic blocking layer is formed inside shale, thereby achieving effects of preventing and delaying pressure transmission and filtration invasion, and further enhancing stability of a shale well wall.
Description
Technical field:
The present invention relates to drilling fluid responsive to temperature type intelligent nano particle and preparation method thereof in a kind of Process of Oil Well Drilling, in drilling fluid construction, belong to oil-drilling field.
Technical background:
Before the nineties in 20th century, both at home and abroad to the focal point of unconventional gas resources at coal-seam gas and compact sandstone gas.In recent years, under the promotion of the technical progresses such as horizontal well drilling, coiled tubing perforation and waterfrac treatment, the states such as America & Canada take the lead in carrying out commercial development to shale gas, obtain huge success.The final shale gas stock number in the whole world is more than 1000 × 10 according to estimates
12m
3.Surprising in the rate of growth of north America region shale gas output, within 2011, U.S.'s shale gas output has accounted for 15% of its gas production, and the exploratory development of shale gas reservoir is just expanded rapidly to the whole world by North America, likely becomes the new highlight of global Oil Gas exploratory development.
China's shale gas resources technologically recoverable reserves reaches 10.3 × 10
12~ 47 × 10
12m
3, have good fair exploration, current China shale gas resources exploration attention, for the accumulation feature of shale gas, shale gas exploitation is based on extended reach well, cluster horizontal well well spacing.Because shale formation grows microfissure, water sensitivity by force, easily there is serious Wellbore Stability in long horizontal sections drilling well, seriously constrain shale gas exploratory development process.Dark-coloured rich organic shaliness is crisp, matter hard, and bedding, microfracture are extremely grown, and distribute in three-dimensional network shape.Bore after meeting Fractured shale formation, under the motivating force effects such as bottom hole pressure difference, capillary force, difference in chemical potential, it is inner that drilling fluid filtrate preferentially invades shale along microfracture or bed plane, cause nearly borehole wall formation pore pressure to increase, weaken drilling well liquid columnpressure and the Effective Mechanical Properties of the borehole wall is supported; Drilling fluid filtrate invades and changes the original physico-chemical balance in stratum, and hydration occurs, and meanwhile, " wedging " effect of drilling fluid filtrate impels the cracking of microfracture, expansion, bifurcated, expands, until mutually through, finally macroscopic failure occurs.Therefore, the key maintaining wellbore stability strengthens the shutoff to micropore, microfissure, reduces filtrate and invade and pressure transmission effects.
Analyze according to statistics, China's shale gas reservoir pore space size many places are in micro-nano-scale, and aperture main body distribution range is 5-200nm.Conventional drilling fluid-tight blocking agent particle diameter bigger than normal being difficult to such as pitch class, emulsified olefin class, polymerization alcohols form the intrusion of effective mud cake prevention liquid phase at shale surface; only has the pore throat of nano-scale particle ability shutoff shale; stop liquid phase invaded formation, safeguard wellbore stability, protection reservoir.
Over nearly 20 years, the basic theories such as the research of nano material obtains in a lot of fields and develops on a large scale very much, nanocomposite optical material, Nano semiconductor, nano biomedical material, nanoreinforcement material, nano modification surface and application technical research have high level.The multifunction of nano material and high performance become the focus of Material Field research, most study, be that intelligent macromolecule by having environmental stimulus (temperature, pH value, electrolyte concentration, magneticstrength, strength of electric field etc.) respondent behavior is combined with nanoparticle the most widely, realize the intellectuality of nanoparticle.
Propose the method for temperature sensitive type intelligent macromolecule by surface chemical modification herein, modify nanoparticle surface, be prepared in the medium-term and long-term stable dispersion of water-base drilling fluid, and have the intelligent nano particle of physics shutoff and Chemical Inhibition dual-use function concurrently, also regulate and control the phase transition temperature of temperature sensitive type intelligent macromolecule by the introducing of parent/hydrophobic monomer, the intelligent nano particle of parent/hydrophobic transformation is occurred at different temperatures to adapt to the stratum of differing temps.This research is by the research and development for shale formation high performance water-based drilling fluid, and shale formation wellbore stability and reservoir protection, provide new thinking and countermeasure.
Summary of the invention:
For solving problems of the prior art, the invention provides a kind of drilling fluid responsive to temperature type intelligent nano particle and preparation method thereof.The ability that the slow pressure of drilling fluid resistance transmits can be improved, the ability that drilling fluid improves mud stone semi-permeable membranes character can also be increased substantially, be beneficial to and keep shale wellbore stability, reduce drilling cost.
An object of the present invention is to provide a kind of drilling fluid responsive to temperature type intelligent nano particle.
Two of object of the present invention is to provide a kind of preparation method of drilling fluid responsive to temperature type intelligent nano particle.
Technical solution of the present invention is as follows:
A preparation method for drilling fluid responsive to temperature type intelligent nano particle, comprises step as follows:
(1) Nano-meter SiO_2
2the surface modification of powder
By Nano-meter SiO_2
2powder is 120 DEG C of dry 24h in vacuum drying oven, take a certain amount of SiO
2be scattered in dehydrated alcohol, ultrasonic disperse 0.5-1h under certain power, separately get appropriate coupling agent and be dissolved in dehydrated alcohol, both are mixed, proceed in four-hole boiling flask after continuing supersound process 1-2h, N
2react 2-4h under sonic oscillation condition at atmosphere, uniform stirring and 85 DEG C, after completion of the reaction that product is centrifugal, with absolute ethanol washing for several times, be placed in 60 DEG C of vacuum drying oven dry for standby.
(2) preparation of responsive to temperature type intelligent nano particle
Responsive to temperature type monomer, hydrophilic monomer, solubility promoter being added is equipped with in the reactor of water, adds appropriate surface-modified nano SiO
2, high-speed stirring forms stable dispersion, and heating in water bath closed reactor, adds initiator initiated polymerization, and described initiator dosage is the 0.2-0.8% of monomer total mass; Control reaction times 2-4 hour, after reaction terminates, product is centrifugal, with absolute ethanol washing several, be placed in 60 DEG C of vacuum drying ovens and dry.
Described responsive to temperature type intelligent nano particles size distribution is D
10≤ 100nm, D
50≤ 165nm, D
90≤ 260nm.
Described Nano-meter SiO_2
2powder is industrial goods, and particle diameter is 20-80nm.
Described ultrasonic disperse adopts cell disruptor, and power 50-1200W is adjustable.
Described coupling agent is any one or a few in Silane coupling agent KH550, KH560, KH570, Si-69, A-151, A-171.
Described responsive to temperature type monomer be NIPA, N,N-DMAA, N, N-diethyl alcohol radical acrylamide, PDMAEMA, in any one or a few.
Described hydrophilic monomer is any one or a few in vinylformic acid, methacrylic acid, methyl acrylate, methylene-succinic acid, vinyl acetate.
Described solubility promoter is any one or a few in methyl alcohol, ethanol, acetone, glycerol, Virahol.
Described initiator is any one or a few in Potassium Persulphate, Diisopropyl azodicarboxylate, 2,2'-Azobis(2,4-dimethylvaleronitrile), isopropyl benzene hydroperoxide, benzoyl peroxide.
Described water is preferably distilled water.
According to drilling fluid responsive to temperature type intelligent nano particle preparation method of the present invention, preferred water bath heating temperature is 70-100 DEG C.Further preferably, water bath heating temperature is 70-90 DEG C.
According to drilling fluid responsive to temperature type intelligent nano particle preparation method of the present invention, the preferred reaction time is 2.5-3.5 hour.
According to drilling fluid responsive to temperature type intelligent nano particle preparation method of the present invention, preferred high-speed stirring speed is 1000-3000r/min.Preferably high-speed stirring speed is 1200-2000r/min further.
Drilling fluid responsive to temperature type intelligent nano particle preparation method of the present invention, further preferably water, solubility promoter, surface-modified nano SiO
2, temperature sensitive type monomer, hydrophilic monomer mass ratio be 200-300:80-150:40-50:20-35:5-15, described initiator is the 0.3-0.6% of monomer total mass.
Drilling fluid responsive to temperature type intelligent nano particle of the present invention directly adds in drilling fluid base slurry when applying, plugging agent consumption is the 2wt% of drilling fluid base slurry weight.
The present invention adopts silane coupling agent to Nano-meter SiO_2
2carry out ultrasonic surface modification, introduce vinyl functional group.Theory of chemical bonds thinks that the effect of organo silane coupling agent moisture first in atmosphere issues unboiled water solution, then dehydrating condensation forms oligopolymer, this oligopolymer forms hydrogen bond with the hydroxyl of silica sphere again, by heat drying generation dehydration reaction generating portion covalent linkage, thus silica sphere is covered by silane coupling agent.
The present invention adopts emulsifier-free emulsion polymerization method, the responsive to temperature type intelligent nano particle prepared, and its latex particle has good monodispersity and water tolerance, and clean surface; In addition, the more important thing is that the inventive method is avoided using emulsifying agent (tensio-active agent), prepared responsive to temperature type intelligent nano particle joins among water-base drilling fluid, avoid the bubble problem of water-base drilling fluid, therefore, the responsive to temperature type intelligent nano particle of gained of the present invention is specially adapted to water-base drilling fluid, also can be used for oil base drilling fluid.And the micro-nano plugging agent of shale that conventional art conventional emulsion polymerization method prepares exists the problem easily rising and bubble in water-base drilling fluid, be only applicable to oil base drilling fluid.
The drilling fluid responsive to temperature type intelligent nano particle obtained according to preparation method of the present invention has good monodispersity, average particle size distribution is at about 240nm, stability is strong, fresh water can be dispersed in, fresh water increases the weight of, in salt-water drilling fluid, deformable shutoff shale nanoaperture and microfracture, play the effect that the slow pressure transmission of resistance invades with filtrate, enhancing shale borehole wall stability.In addition, described drilling fluid responsive to temperature type intelligent nano particle is little on the impact of drilling fluid rheology performance, and is conducive to reducing drilling fluid filtration.The mechanism of action is as follows: temperature sensitive type intelligent nano particle is a kind of deformable polymer/inorganic materials composite particles of micro-nano-scale, under differential pressure action, nanoparticle is pressed in borehole wall hole and microfracture, by absorption, build bridge and deformable filling effect, continuous sedimentation, filling, compacting, fine and close physics plugged zone is formed on rock of borehole surface, simultaneously along with formation temperature raises, the temperature sensing polymer of nanoparticle surface is hydrophobic state from hydrophilic state, form hydrophobic layer at the borehole wall, play the function of Chemical Inhibition.Therefore, this intelligent nano particle can play the dual-use function of physics shutoff and Chemical Inhibition simultaneously, shows excellent sealing characteristics, plays the effect that the slow pressure transmission of resistance invades with filtrate, enhancing shale borehole wall stability.
The present invention compared with prior art tool has the following advantages:
1, drilling fluid responsive to temperature type intelligent nano particle preparation method provided by the invention is at airtight heating condition lower surface modified Nano SiO
2, temperature sensitive type monomer, hydrophilic monomer emulsifier-free emulsion polymerization reaction, this preparation method is easy and simple to handle, and technique is simple;
2, drilling fluid responsive to temperature type intelligent nano particle provided by the invention is a kind of deformable polymer/inorganic materials compounded latex particle of micro-nano-scale, can by absorption, bridge formation and deformable filling effect, the fine and close plugged zone of continuous print is formed in shale inside, simultaneously along with formation temperature raises, the temperature sensing polymer of nanoparticle surface is hydrophobic state from hydrophilic state, form hydrophobic layer at the borehole wall, play the function of Chemical Inhibition.Therefore, this intelligent nano particle plays the dual-use function of physics shutoff and Chemical Inhibition simultaneously, plays the effect that the slow pressure transmission of resistance invades with filtrate, enhancing shale borehole wall stability.
3, drilling fluid responsive to temperature type intelligent nano particle provided by the invention can directly add in water-base drilling fluid, easy to use, and can not affect the performance of drilling fluid system because of problems such as drilling fluid foamings.
Accompanying drawing illustrates:
Fig. 1 is the transmission electron microscope photo of drilling fluid responsive to temperature type intelligent nano particle prepared by embodiment 1.
Fig. 2 is the laser particle distribution curve of drilling fluid responsive to temperature type intelligent nano particle prepared by embodiment 1.
Embodiment:
Below the present invention is described further, but embodiments of the present invention are not limited thereto.
Embodiment 1
(1) Nano-meter SiO_2
2the surface modification of powder
By Nano-meter SiO_2
2powder is 120 DEG C of dry 24h in vacuum drying oven, take the SiO of 20g
2be scattered in 50mL dehydrated alcohol, ultrasonic disperse 1h under 600W power, separately get 0.96g silane coupling agent KH570 and be dissolved in dehydrated alcohol, both are mixed, proceed in four-hole boiling flask after continuing supersound process 1-2h, N
2react 2-4h under sonic oscillation condition at atmosphere, uniform stirring and 85 DEG C, after completion of the reaction that product is centrifugal, with absolute ethanol washing for several times, be placed in 60 DEG C of vacuum drying oven dry for standby.
(2) preparation of responsive to temperature type intelligent nano particle
To in the reactor that agitator, thermometer and heating unit are housed, add 200mL distilled water, add acetone 100mL, surface-modified nano SiO while stirring
220g, NIPA 12.3g, vinylformic acid 9.6g, 1500r/min high-speed stirring forms stable dispersion, heating in water bath to temperature is 70 DEG C, add Potassium Persulphate 0.08g, reaction 2.5h, after reaction terminates, product is centrifugal, with absolute ethanol washing several, be placed in 60 DEG C of vacuum drying ovens and dry.
Embodiment 2
(1) Nano-meter SiO_2
2the surface modification of powder
By Nano-meter SiO_2
2powder is 120 DEG C of dry 24h in vacuum drying oven, take the SiO of 15g
2be scattered in 50mL dehydrated alcohol, ultrasonic disperse 1h under 900W power, separately get 1.32g Silane coupling agent KH550 and be dissolved in dehydrated alcohol, both are mixed, proceed in four-hole boiling flask after continuing supersound process 2-3h, N
2react 2-4h under sonic oscillation condition at atmosphere, uniform stirring and 85 DEG C, after completion of the reaction that product is centrifugal, with absolute ethanol washing for several times, be placed in 60 DEG C of vacuum drying oven dry for standby.
(2) preparation of responsive to temperature type intelligent nano particle
To in the reactor that agitator, thermometer and heating unit are housed, add 300mL distilled water, add acetone 150mL, surface-modified nano SiO while stirring
225g, N, N-DMAA 16.7g, methacrylic acid 11.2g, 1000r/min high-speed stirring forms stable dispersion, heating in water bath to temperature is 85 DEG C, add 2,2'-Azobis(2,4-dimethylvaleronitrile) 0.12g, reaction 3.5h, after reaction terminates, product is centrifugal, with absolute ethanol washing several, be placed in 60 DEG C of vacuum drying ovens and dry.
Embodiment 3
(1) Nano-meter SiO_2
2the surface modification of powder
By Nano-meter SiO_2
2powder is 120 DEG C of dry 24h in vacuum drying oven, take the SiO of 25g
2be scattered in 80mL dehydrated alcohol, ultrasonic disperse 1.2h under 1000W power, separately get 2.1g silane coupling A-151 and be dissolved in dehydrated alcohol, both are mixed, proceed in four-hole boiling flask after continuing supersound process 2-3.5h, N
2react 3-4h under sonic oscillation condition at atmosphere, uniform stirring and 75 DEG C, after completion of the reaction that product is centrifugal, with absolute ethanol washing for several times, be placed in 60 DEG C of vacuum drying oven dry for standby.
(2) preparation of responsive to temperature type intelligent nano particle
To in the reactor that agitator, thermometer and heating unit are housed, add 250mL distilled water, add Virahol 130mL, surface-modified nano SiO while stirring
226.1g, NIPA 12.3g, methyl acrylate, vinylbenzene 9.6g, 2000r/min high-speed stirring forms stable dispersion, heating in water bath to temperature is 90 DEG C, add Diisopropyl azodicarboxylate 0.10g, reaction 2.0h, after completion of the reaction that product is centrifugal, with absolute ethanol washing several, be placed in 60 DEG C of vacuum drying ovens and dry.
Below the product performance of embodiment and effect are described.
1, the Size Distribution of shale micro-nano granules plugging agent
Utilize laser granularity distribution tester, test the particle size distribution characteristic of the responsive to temperature type intelligent nano particle of above-mentioned different embodiment.
As shown in Table 1, the main peak distributed area of the nano particle diameter distribution of the above embodiments 1, embodiment 2, embodiment 3 is between 90-200nm, match with the micro-nano-scale hole of shale formation, crack, the fine and close plugged zone of continuous print can be formed in shale formation inside, play the effect that the slow pressure transmission of resistance invades with filtrate, enhancing shale borehole wall stability.
The particle size distribution characteristic of table 1 shale responsive to temperature type intelligent nano particle
2, shale micro-nano granules plugging agent affects property of drilling fluid
Testing method: adopt GB/T16783-1997: water-base drilling fluid On-Site Test Procedure.
Base slurry preparation: stir in cup at height and add 4% prehydration bentonite slurry 350mL, add 0.8g xanthan gum, 1.2g Polyanionic Cellulose and 4.0g treated starch successively, stir 30 minutes under constantly stirring, is base slurry.
The preparation of experiment slurry and test: add the assess sample of 1wt% respectively in experiment base slurry, high-speed stirring is even, utilize six fast viscometers and middle press filtration to commit a breach of etiquette rheological that test experiments starches and leak-off.Loaded in high temperature ageing tank by experiment slurry, at 150 DEG C, heat rolls aging 16h, tests its rheological and leak-off with same method.
As shown in Table 2, the rheological property of drilling fluid responsive to temperature type intelligent nano particle of the present invention on drilling fluid does not affect substantially, but can improve the leak-off of drilling fluid significantly, reduces the API filtration (more than 50%) of drilling fluid.
Table 2 drilling fluid rheology filtration property test result
Note: AV is drilling fluid apparent viscosity; PV is drilling fluid plastic viscosity; YP is drilling fluid yield value; API presses fluid loss in drilling fluid.
3, the sealing characteristics evaluation of responsive to temperature type intelligent nano particle
By High Temperature High Pressure borehole wall mud shale/drilling fluid effect simulates experimental installation, choose Sichuan Basin Longma small stream group shale core, utilize pressure transportation experiment to evaluate drilling fluid responsive to temperature type intelligent nano particle sealing characteristics of the present invention.Experimental technique is as follows: shale core is placed in rock core and accommodates device, apply axial compression and confined pressure, be heated to specify experiment condition, fully to simulate actual formation temperature, pressure environment; Selected rock core upstream, downstream test solution, set up the initial differential pressure in rock core upstream, downstream, keep upstream pressure constant, the dynamic pressure change of rock core lower end closed fluid is detected in real time by pressure transmitter and differential pressure pick-up, and test front and back core permeability to carry out evaluation temperature sensitive intelligent nanoparticle sealing characteristics as technical indicator.
As shown in Table 3, after adding embodiment 1, embodiment 2, the upstream test solution of embodiment 3 and rock core effect, can significantly reduce shale rate of permeation, permeability reduction rate all reaches more than 95%, the slow pressure transmission of resistance and filtrate invade, and strengthen crack shale formation borehole wall stability.
Table 3 shale micro-nano granules plugging agent sealing characteristics test result
Claims (11)
1. drilling fluid responsive to temperature type intelligent nano particle and preparation method thereof, comprises step as follows:
Adopt silane coupling agent to Nano-meter SiO_2
2carry out ultrasonic surface modification, introduce vinyl functional group, by surface-modified nano SiO
2, responsive to temperature type monomer, hydrophilic monomer, solubility promoter add and be equipped with in the reactor of water, high-speed stirring forms stable dispersion, described water, solubility promoter, surface-modified nano SiO
2, temperature sensitive type monomer, hydrophilic monomer mass ratio be 200-300:80-150:40-50:20-35:5-15, heating in water bath closed reactor, adds initiator initiated polymerization, and described initiator is the 0.3-0.6% of monomer total mass; Control reaction times 2-4 hour, after reaction terminates, product is centrifugal, with absolute ethanol washing several, be placed in 60 DEG C of vacuum drying ovens and dry.
2. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, is characterized in that described nanoparticle size-grade distribution be size-grade distribution is D
10≤ 100nm, D
50≤ 165nm, D
90≤ 260nm.
3. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, is characterized in that described coupling agent is any one or a few in Silane coupling agent KH550, KH560, KH570, Si-69, A-151, A-171.
4. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, it is characterized in that described responsive to temperature type monomer is NIPA, N, N-DMAA, N, N-diethyl alcohol radical acrylamide, PDMAEMA, in any one or a few.
5. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, is characterized in that described hydrophilic monomer is any one or a few in vinylformic acid, methacrylic acid, methyl acrylate, methylene-succinic acid, vinyl acetate.
6. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, is characterized in that described solubility promoter is any one or a few in methyl alcohol, ethanol, acetone, glycerol, Virahol.
7. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, is characterized in that described initiator is any one or a few in Potassium Persulphate, Diisopropyl azodicarboxylate, 2,2'-Azobis(2,4-dimethylvaleronitrile), isopropyl benzene hydroperoxide, benzoyl peroxide.
8. responsive to temperature type intelligent nano particle as claimed in claim 1 and preparation method thereof, is characterized in that described water is preferably distilled water.
9. responsive to temperature type intelligent nano particle as claimed in claim 8 and preparation method thereof, is characterized in that water bath heating temperature is 70-100 DEG C.Further preferably, water bath heating temperature is 70-90 DEG C.
10. responsive to temperature type intelligent nano particle as claimed in claim 8 and preparation method thereof, is characterized in that high-speed stirring speed is 1000-3000r/min.Preferably high-speed stirring speed is 1200-2000r/min further.
11. responsive to temperature type intelligent nano particles as claimed in claim 8 and preparation method thereof, is characterized in that described water, solubility promoter, surface-modified nano SiO
2, temperature sensitive type monomer, hydrophilic monomer mass ratio be 200-300:80-150:40-50:20-35:5-15.
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| CN107915798A (en) * | 2017-12-05 | 2018-04-17 | 西南石油大学 | A kind of water-base drilling fluid polymer nanocomposite sealing agent and preparation method thereof |
| CN108192107A (en) * | 2017-12-29 | 2018-06-22 | 中国石油大学(华东) | A kind of shale stability agent and preparation method thereof |
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| CN114957571A (en) * | 2022-05-10 | 2022-08-30 | 中国石油大学(华东) | Nano spherical amphoteric polyelectrolyte brush plugging agent for water-based drilling fluid and preparation method and application thereof |
| CN115725275A (en) * | 2021-08-27 | 2023-03-03 | 中国石油天然气集团有限公司 | Preparation method and application of modified nano-silica plugging agent for water-based drilling fluid |
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| CN108192107B (en) * | 2017-12-29 | 2019-06-04 | 中国石油大学(华东) | A kind of shale stability agent and preparation method thereof |
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| CN110387016A (en) * | 2019-07-10 | 2019-10-29 | 黑龙江益瑞化工有限公司 | A kind of drilling fluid nanometer polymer sealing agent and preparation method thereof |
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| CN114426813A (en) * | 2020-10-29 | 2022-05-03 | 中国石油化工股份有限公司 | High-temperature-resistant gel particle while-drilling plugging agent and preparation method and application thereof |
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| CN113403042A (en) * | 2021-06-22 | 2021-09-17 | 西南石油大学 | Organic-inorganic nano composite hydrogel and water-based drilling fluid |
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| CN113801643B (en) * | 2021-09-18 | 2023-02-17 | 中国石油化工集团有限公司 | Temporary plugging agent for pH-sensitive drilling fluid and preparation and use methods thereof |
| CN113801643A (en) * | 2021-09-18 | 2021-12-17 | 中国石油化工集团有限公司 | Temporary plugging agent for pH-sensitive drilling fluid and preparation and use methods thereof |
| CN113773440A (en) * | 2021-10-12 | 2021-12-10 | 中国石油大学(华东) | Water-based drilling fluid filtrate reducer capable of inhibiting natural gas hydrate decomposition and preparation method and application thereof |
| CN114957571A (en) * | 2022-05-10 | 2022-08-30 | 中国石油大学(华东) | Nano spherical amphoteric polyelectrolyte brush plugging agent for water-based drilling fluid and preparation method and application thereof |
| CN114957571B (en) * | 2022-05-10 | 2023-08-11 | 中国石油大学(华东) | Nanometer spherical amphoteric polyelectrolyte brush plugging agent for water-based drilling fluid and preparation method and application thereof |
| CN114891168A (en) * | 2022-05-12 | 2022-08-12 | 中国石油大学(华东) | Water-based drilling fluid plugging inhibitor for improving integrity of shaft and preparation method and application thereof |
| CN116218487A (en) * | 2022-12-26 | 2023-06-06 | 中石化石油工程技术服务有限公司 | Preparation method and application of temperature-sensitive phase-change plugging agent |
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