CN112251206A - Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof - Google Patents

Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof Download PDF

Info

Publication number
CN112251206A
CN112251206A CN202011016621.0A CN202011016621A CN112251206A CN 112251206 A CN112251206 A CN 112251206A CN 202011016621 A CN202011016621 A CN 202011016621A CN 112251206 A CN112251206 A CN 112251206A
Authority
CN
China
Prior art keywords
peg
capb
mag
oil
preparation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011016621.0A
Other languages
Chinese (zh)
Inventor
章峻
代勇
莫宏
沈健
何磊
王磊
杨陆涛
张鲁霞
蒋雪峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Normal University
Original Assignee
Nanjing Normal University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Normal University filed Critical Nanjing Normal University
Priority to CN202011016621.0A priority Critical patent/CN112251206A/en
Publication of CN112251206A publication Critical patent/CN112251206A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
    • 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
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Cosmetics (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Abstract

The invention discloses a magnetic nano oil-displacing agent with black phosphorus as a matrix and a preparation method thereof, wherein the oil-displacing agent is represented by MAG-CS/PEG @ BP- (g) -BTS, MAG is a magnetic substance, CS is chitosan, PEG is a polyethylene glycol modifier, BP is a black phosphorus matrix, and BTS is a betaine type surfactant. The magnetic nano oil displacement agent has excellent performance, can realize recycling, has strong emulsifying capacity, has obviously increased emulsifying capacity compared with a simple betaine surfactant in an indoor oil displacement performance test, improves the crude oil recovery ratio to 13.8 percent, and has great application prospect in the field of improving the petroleum recovery ratio.

Description

Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof
Technical Field
The invention relates to an oil-displacing agent and a preparation method thereof, in particular to a magnetic nano oil-displacing agent taking black phosphorus as a matrix and a preparation method thereof.
Background
The demand of the rapid development of the world for petroleum increases year by year, a large amount of residual oil remains in the stratum after primary and secondary oil extraction stages, and if the residual oil can be effectively used, the contribution is not inferior to the discovery of new oil fields. Therefore, the development and application of the tertiary oil recovery technology have extremely important significance for further improving the recovery ratio of the existing oil reservoir. In recent years, anionic surfactants represented by petroleum sulfonate are widely applied to tertiary oil displacement for improving recovery efficiency, and a good displacement effect is obtained.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a magnetic nano oil displacement agent taking black phosphorus as a matrix and capable of improving the crude oil recovery ratio and a preparation method thereof.
The technical scheme is as follows: the magnetic nano oil displacement agent is represented by MAG-CS/PEG @ BP- (g) -BTS, wherein MAG is a magnetic substance, CS is chitosan, PEG is a polyethylene glycol modifier, BP is a black phosphorus matrix, and BTS is a betaine type surfactant.
The inventor researches and discovers that demulsification treatment is needed after a common chemical oil displacement agent displaces oil, so that oil-water separation is realized, the problems of difficult demulsification and pollution caused by an added demulsifier exist in surfactant oil displacement, and the common chemical oil displacement agent cannot be recycled and reused after being used, so that the problems of waste of a chemical agent, increase of oil displacement cost, pollution to a water source and the like are urgently solved. Compared with a conventional two-dimensional material, the black phosphorus has more excellent surface property and a more convenient and economic modification mode, is an ideal matrix of the magnetic response surfactant, can realize recycling by endowing the black phosphorus with magnetism, can promote emulsion breaking of emulsion, greatly improves the oil-water separation efficiency, and has a better synergistic yield-increasing effect. In the invention, a magnetic substance is coated by chitosan and loaded on a black phosphorus matrix modified by polyethylene glycol, and the black phosphorus matrix is grafted with a betaine surfactant, wherein MAG is loaded to obtain a magnetically recyclable oil displacement agent, and the chitosan is a nontoxic, cheap and easily grafted substance.
It should be noted that MAG-CS or MAG/CS can be used to indicate the chitosan-coated magnetic substance in the present invention.
Preferably, MAG is Fe3O4、CrO2Or Mn2O3In which Fe is used3O4The effect is optimal.
In the invention, the mass ratio of MAG to chitosan is 1: 1-1: 3, preferably 1: 1.
Further, the BTS is a cocamidopropyl betaine surfactant (CAPB), a lauramidopropyl betaine surfactant (LAB), or a mesoamidopropyl betaine surfactant (EAB).
In the invention, the mass ratio of PEG to BP is 1: 1-5: 1, preferably, the mass ratio of PEG to BP is 2: 1.
Further, the mass ratio of BP to MAG is 1: 1-1: 10, and preferably, the mass ratio of BP to MAG is 1: 5.
Further, the mass ratio of BP to BTS is 1: 1-1: 10, preferably, the mass ratio of BP to BTS is 1: 5.
The preparation method of the magnetic nano oil displacement agent comprises the following steps:
(1) mixing polyethylene glycol and black phosphorus for reaction to prepare PEG @ BP;
(2) mixing magnetic substance with chitosan for reaction to obtain MAG/CS
(3) PEG @ BP, MAG and BTS are mixed for reaction, and MAG-CS/PEG @ BP- (g) -BTS is obtained by centrifugation and collection.
Preferably, in the step (3), the mixing reaction is performed under the ultrasonic condition of 30-60 ℃. Further, the ultrasonic time is 10-60 min, preferably 30 min.
Further, the method for preparing MAG-CS is as follows: mixing magnetic MAG and chitosan CS while performing ultrasonic treatment to obtain a uniform solution, or performing ultrasonic treatment and mixing to obtain a uniform solution, and adding NH dropwise3·H2Adjusting the pH value of the solution to 9-13 by using O or NaOH, continuously stirring for 1-3 h at 60-100 ℃ under the protection of argon or helium, and refluxing the generated black product. Adsorbing MAG-CS by using a magnet and removing supernatant, washing the separated MAG-CS, drying the washed MAG-CS for 2-6 h at the temperature of 60-100 ℃, and carrying out ultrasonic treatment on the obtained MAG-CS in water for 1-3 h to prepare MAG-CS solution.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: firstly, black phosphorus is selected as a matrix of the oil displacement agent, the black phosphorus is a layered crystal, has metallic luster and can conduct electricity, has the outstanding advantages of band gap and high electron mobility, and simultaneously has the excellent performances which are lacked by common two-dimensional materials, such as direct band gap effect and extremely high structural stability, atoms in the black phosphorus layer of a lamellar structure are connected by covalent bonds, and the layers are combined through Van der Waals force, so that the form and thermodynamics are stable, meanwhile, the black phosphorus nanosheet has a large specific surface area, the full contact between the nano oil displacement agent and a gas-liquid interface is facilitated, the stability of foam is improved, and the profile control effect is better played; secondly, magnetic substances are introduced to form the oil displacement agent with magnetic response, and the recovery and the reutilization of the nano oil displacement agent can be realized; the magnetic nano oil displacement agent can change the rheological property of an oil-water interface film, reduce the interface expansion modulus, and avoid the emulsion breaking difficulty and the environmental pollution caused by adding a demulsifier; meanwhile, the coating of the chitosan can enable the magnetic substance to be loaded on the matrix more stably, and meanwhile, betaine surfactants can be grafted to optimize the oil displacement effect, and the chitosan is nontoxic and easy to biodegrade; in addition, the introduction of PEG increases the oil resistance and high salt resistance of the magnetic oil displacement agent and promotes the reduction of the viscosity of crude oil, thereby realizing the improvement of the recovery ratio of the crude oil. In conclusion, the magnetic oil displacement agent using the black phosphorus as the matrix has a huge application prospect in the aspect of displacing crude oil and improving the recovery ratio due to the excellent performance of the magnetic oil displacement agent, and meanwhile, the method can modify the black phosphorus and graft the surfactant under a mild condition, has the advantages of environmental friendliness, cyclic utilization and the like, and provides a new idea for developing a new generation of intelligent surfactant for oil and gas fields.
Drawings
FIG. 1 is a transmission electron microscope image of a magnetic oil displacement agent prepared by taking black phosphorus as a matrix;
FIG. 2 is a Fourier transform infrared spectrogram of a magnetic oil displacement agent prepared by taking black phosphorus as a matrix;
FIG. 3 is an X-ray diffraction spectrum of a magnetic oil-displacing agent prepared by taking black phosphorus as a matrix;
FIG. 4 is a diagram of the emulsifying properties of a magnetic oil-displacing agent prepared with black phosphorus as a matrix;
FIG. 5 is a surface tension performance diagram of a magnetic oil displacement agent prepared by taking black phosphorus as a matrix;
FIG. 6 is a graph showing the variation of recovery ratio and water content in the displacement experiment process of the magnetic oil displacement agent prepared by using black phosphorus as a matrix.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Example 1
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4-CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4CS and removal of the supernatant, Fe isolated3O4washing-CS with distilled water for many times, and drying at 80 ℃ for 4 hours to obtain Fe3O4Carrying out ultrasonic treatment on-CS in 100mL of deionized water for 2h to prepare Fe3O4-a CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4-CS sonicate for 30min separately, add 0.5g CAPB, then stir at 45 ℃ for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 2
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of CrO2-CS: 0.5g of CrO2And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing CrO with magnet2CS and removal of the supernatant, CrO separated2washing-CS with distilled water for many times, and drying at 80 ℃ for 4 hours to obtain CrO2Performing ultrasonic treatment on-CS in 100mL of deionized water for 2h to prepare CrO2a/CS solution.
(3) Preparation of CrO2-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and CrO2-CS sonicate for 30min separately, add 0.5g CAPB, then stir at 45 ℃ for 4 h. The prepared CrO was collected by centrifugation at 5000rpm2-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to produce CrO2-CS/PEG @ BP- (g) -CAPB solution.
Example 3
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Mn2O3CS: 0.5g of CrO2And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Mn with a magnet2O3/CS and removing the supernatant, Mn isolated2O3/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Mn2O3Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Mn2O3a/CS solution.
(3) Preparation of Mn2O3-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Mn2O3/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 45 deg.C for 4 h. The prepared Mn was collected by centrifugal separation at 5000rpm2O3-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to produce Mn2O3-CS/PEG @ BP- (g) -CAPB solution.
Examples 1-3 all of the three magnetic substance-modified materials have better recovery performance, and under the same conditions, Fe3O4-CS/PEG @ BP- (g) -CAPB has better recyclability due to the Fe used3O4The modified black phosphorus is prepared by a chemical precipitation method, the surface of the modified black phosphorus contains a large number of functional groups, the modified black phosphorus is easy to react, and meanwhile, the product is more stable.
Example 4
(1) Preparation of PEG @ BP: 0.1g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. 40 deg.CStirring for 15min to obtain a uniform solution, and dropwise adding NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 5
(1) Preparation of PEG @ BP: 0.3g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS respectivelySonicate for 30min, add 0.5g CAPB, and stir at 45 ℃ for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 6
(1) Preparation of PEG @ BP: 0.5g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Examples 4-6 are directed to the effect of the change in the quality of the polyethylene glycol on the results, and the results of the experiments of examples 4-6 were combined to change the quality of the polyethylene glycol, so that when the amount of PEG added was small, the sites providing grafting were small, and when the amount of PEG was too large, the black phosphorus nanoparticles were deactivated, and the best effect was obtained when PEG BP was 2: 1.
Example 7
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 6. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 8
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 9. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 9
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 13. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treating for 30min, adding 0.5g CAPB, and heating at 45 deg.CStirred for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Examples 7 to 9 are directed to the effect of pH change on the results, and combining the results of the experiments of examples 7 to 9, the results were best when the pH was 11, by changing the pH conditions. The chitosan structure is easy to damage due to the low pH value, which is not favorable for fully wrapping Fe by chitosan3O4(ii) a At too high a pH, Fe3O4The surface zeta potential is lowered, resulting in Fe3O4The particles are not uniformly aggregated and dispersed, which affects the exertion of the magnetic response function.
Example 10
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -LAB: the prepared PEG @ BP and Fe3O4Respectively sonicating for 30min in/CS, adding 0.5g LAB, and then stirring at 45 ℃ for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -LAB, washed 3 times with deionized water and redispersed in 100ml of deionized waterIn water to obtain Fe3O4-CS/PEG @ BP- (g) -LAB solution.
Example 11
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -EAB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g EAB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -EAB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -EAB solution.
Examples 10-11 are directed to the effect of different betaine surfactants on the results, and the different betaine surfactants of examples 10-11 all have certain emulsification effects, and the grafted cocamidopropyl betaine surfactant (CAPB) has the best emulsification effect, probably because the CAPB has a smaller molecular weight and a higher amount of CAPB-containing substances under the same mass condition, and the CAPB is grafted with the modified black phosphorus more completely, and the emulsification effect is better.
Example 12
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS for 30min, respectively, adding 0.1g CAPB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 13
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon gas, 80Stirring was continued at C for 2h and the resulting black product was refluxed. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 1g CAPB, and stirring at 45 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Examples 12-13 are directed to the effect of varying the quality of betaine surfactant on the results, and the results of the experiments of examples 12-13 were combined to vary the quality of the surfactant CAPB, which was best when BP: CAPB was 1: 10. Too little CAPB will result in incomplete grafting, too much CAPB will result in less action of the excess surfactant and will increase the cost of oil displacement after the grafting sites are fully utilized.
Example 14
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 30 deg.C for 4 h. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Example 15
(1) Preparation of PEG @ BP: 0.2g of polyethylene glycol and 0.1g of black phosphorus powder are weighed and dissolved in 100mL of deionized water, and the mixed solution is subjected to ultrasonic treatment for 30 minutes and then stirred vigorously in a dark bubbling manner for reaction for 4 hours. The resulting solution was then centrifuged at 8000rpm for 20 minutes to remove excess polyethylene glycol and washed twice with deionized water. Vacuum freezing, drying, sealing and storing.
(2) Preparation of Fe3O4CS: 0.5g of Fe3O4And 0.5g of chitosan are respectively ultrasonically treated for 2 hours, mixed and dissolved in a three-neck flask. Stirring at 40 deg.C for 15min to obtain uniform solution, and adding dropwise NH3·H2O adjust the solution pH to 11. Under the protection of argon, stirring is continuously carried out for 2h at the temperature of 80 ℃, and the generated black product flows back. Adsorbing Fe by magnet3O4/CS and removing the supernatant, Fe isolated3O4/CS washing with distilled water for several times, and drying at 80 deg.C for 4 hr to obtain Fe3O4Performing ultrasonic treatment on/CS in 100mL deionized water for 2h to prepare Fe3O4a/CS solution.
(3) Preparation of Fe3O4-CS/PEG @ BP- (g) -CAPB: the prepared PEG @ BP and Fe3O4/CS ultrasonic treatment for 30min, respectively, adding 0.5g CAPB, and stirring at 60 deg.C for 4 hr. The prepared Fe was collected by centrifugal separation at 5000rpm3O4-CS/PEG @ BP- (g) -CAPB, washed 3 times with deionized water and redispersed in 100ml of deionized water to yield Fe3O4-CS/PEG @ BP- (g) -CAPB solution.
Examples 14 to 15 are directed to the effect of the change in reaction temperature on the results, and combining the experimental results of examples 14 to 15 and comparative example, the effect was best when the temperature was 45 ℃.
Example 1 preparation of oil displacing agent Fe, as shown in FIG. 13O4A transmission electron microscope image of-CS/PEG @ BP- (g) -CAPB, wherein black phosphorus nanosheets in the image are thin and transparent, have a good lamellar structure and are 1-3 layers, black spherical particles which are uniformly distributed can be seen, the black spherical particles have a good crystal structure, the particle size is about 1nm, and the black spherical particles are loaded with Fe3O4Particles, but Fe3O4The particles are fuzzy and are covered with a transparent coating layer, which is caused by that the macromolecular PEG modifies the BP surface and simultaneously grafts the surfactant CAPB.
Example 1 preparation of oil displacing agent Fe, as shown in FIG. 23O4Fourier transform Infrared Spectroscopy of-CS/PEG @ BP- (g) -CAPB, in which 3433cm-1The strong infrared absorption peak is caused by-OH stretching vibration and is 1049cm-1Infrared absorption peak at position (588 cm) is caused by-C-O-C-stretching vibration-1Is Fe3O4The vibration peak of medium Fe-O is 1375cm-1Is CH in chitosan2Has a bending vibration absorption peak at 2868cm-1Infrared absorption peak at (B) is-CH in grafted PEG2-induced by stretching vibrations, proof of magnetic oil-displacing agent Fe3O4Successful preparation of CS/PEG @ BP- (g) -CAPB.
Example 1 preparation of oil displacing agent Fe, as shown in FIG. 33O4X-ray diffraction spectrum of-CS/PEG @ BP- (g) -CAPB, Fe can be seen3O4-CS/PEG @ BP- (g) -CAPB showed distinct diffraction peaks at 35 °, 43 °, 57 °, 62 ° 2 θ, respectively corresponding to Fe3O4The characteristic diffraction peaks of (311), (400), (422) and (440) planes of (1) and (422) correspond to (Fe)3O4Standard card Jade #65-3107) and no significant impurity peaks were present, indicating successful preparation of the displacement agent.
Example 16
The oil displacement agent Fe prepared in example 13O4the-CS/PEG @ BP- (g) -CAPB is applied to indoor oil displacement performance tests.
(1) Emulsification performance test process and experimental method
Collecting LAPB and Fe 01%, 0.2%, 0.3%, 0.4%, and 0.5%3O4-CS/PEG @ BP- (g) -CAPB was added to a mixed solution of ionic water (50mL) and white oil (50 mL). Stirring with an IKARW model 16 electromechanical stirrer at 1500rpm for 2min, and standing for 2h to calculate the volume percentage of the emulsion in the total volume.
As shown in FIG. 4, the emulsifying property of the oil displacement agent is shown, and CAPB and Fe can be seen3O4The emulsifying capacity of-CS/PEG @ BP- (g) -CAPB all increased with increasing concentration, but the magnitude of increase decreased after 0.3 w%, with 0.3 w% Fe being chosen in view of the production costs3O4-CS/PEG @ BP- (g) -CAPB addition.
(2) Surface tension performance testing process and experimental method
With Fe3O4-CS/PEG @ BP- (g) -CAPB is used as an oil displacement agent and is prepared into a displacement fluid with the concentration of 5 multiplied by 10 respectively with oil field water-3、1×10-3、5×10-4、1×10-4、5×10-5、1×10-5、5×10-6、1×10-6g/L, surface tension measurements were performed using a JYW-200B model surface tension meter, and the average was taken three times for each concentration measurement.
FIG. 5 is a surface tension performance graph of the oil displacement agent, and analysis of data in the graph shows that the critical micelle concentration of the displacement fluid of CAPB is 1.82 multiplied by 10-4g/L，Fe3O4The critical micelle concentration of the displacement fluid of the-CS/PEG @ BP- (g) -CAPB configuration is 1.45 multiplied by 10-4g/L, effectively reduces the critical micelle concentration and reduces the using amount of the displacing agent.
Example 17
The oil displacement agent Fe prepared in example 13O4the-CS/PEG @ BP- (g) -CAPB is applied to indoor oil displacement experiments.
FIG. 6 shows the addition of Fe3O4-CS/PEG @ BP- (g) -CAPB enhanced oil recovery data plot, added at 0.3 w%. As can be seen, when the injection volume reaches 0.8PV, the water content of the produced fluid reaches more than 98%, and the recovery rate of the crude oil is 50.1%, which shows that most of the crude oil is still in the rock core and is not yet in the rock coreAnd is displaced out. As is evident from the figure, Fe3O4After the-CS/PEG @ BP- (g) -CAPB is injected as a displacing agent, almost no crude oil flows out of the outlet end of the rock core when the injection volume of the subsequent water flooding reaches 1.8PV, the total crude oil recovery rate is 63.9 percent, and the chemical flooding improves the crude oil recovery rate to 13.8 percent compared with the first water flooding, which indicates that a magnetic oil displacing agent Fe3O4-CS/PEG @ BP- (g) -CAPB contributes significantly to enhanced oil recovery.

Claims (10)

1. A magnetic nano oil displacement agent taking black phosphorus as a matrix is characterized in that: the oil displacement agent is represented by MAG-CS/PEG @ BP- (g) -BTS, wherein MAG is a magnetic substance, CS is chitosan, PEG is a polyethylene glycol modifier, BP is a black phosphorus matrix, and BTS is a betaine type surfactant.
2. The magnetic nano oil-displacing agent according to claim 1, characterized in that: MAG is Fe3O4、CrO2Or Mn2O3。
3. The magnetic nano oil-displacing agent according to claim 1, characterized in that: the mass ratio of the MAG to the chitosan is 1: 1-1: 3.
4. The magnetic nano oil-displacing agent according to claim 1 or 2, characterized in that: the BTS is a cocamidopropyl betaine surfactant, a lauramidopropyl betaine surfactant or a mesonic acid amidopropyl betaine surfactant.
5. The magnetic nano oil-displacing agent according to claim 1, characterized in that: the mass ratio of the PEG to the BP is 1: 1-5: 1.
6. The magnetic nano oil-displacing agent according to claim 1, characterized in that: the mass ratio of BP to MAG is 1: 1-1: 10.
7. The magnetic nano oil-displacing agent according to claim 1, characterized in that: the mass ratio of BP to BTS is 1: 1-1: 10.
8. A method for preparing the magnetic nano oil-displacing agent according to claim 1, which is characterized by comprising the following steps:
(1) mixing polyethylene glycol and black phosphorus for reaction to prepare PEG @ BP;
(2) mixing the magnetic substance with chitosan for reaction to prepare MAG-CS;
(3) PEG @ BP, MAG-CS and BTS are mixed for reaction, and MAG-CS/PEG @ BP- (g) -BTS is obtained by centrifugation and collection.
9. The method of claim 8, wherein: in the step (3), the mixing reaction is carried out under the ultrasonic condition of 30-60 ℃.
10. The method of claim 9, wherein: the ultrasonic time is 10-60 min.
CN202011016621.0A 2020-09-24 2020-09-24 Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof Pending CN112251206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011016621.0A CN112251206A (en) 2020-09-24 2020-09-24 Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011016621.0A CN112251206A (en) 2020-09-24 2020-09-24 Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof

Publications (1)

Publication Number Publication Date
CN112251206A true CN112251206A (en) 2021-01-22

Family

ID=74231210

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011016621.0A Pending CN112251206A (en) 2020-09-24 2020-09-24 Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof

Country Status (1)

Country Link
CN (1) CN112251206A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108384573A (en) * 2018-01-31 2018-08-10 天津大学 A kind of preparation method and application of hydrophilic magnetic Nano material
CN109251741A (en) * 2017-07-12 2019-01-22 中国石油化工股份有限公司 A kind of magnetic Nano oil displacement agent and preparation method thereof
CN110760297A (en) * 2019-07-11 2020-02-07 浙江海洋大学 Preparation method of magnetic nanoparticles for stabilizing emulsion
CN111253926A (en) * 2020-02-27 2020-06-09 中国石油天然气股份有限公司 Nano-magnetic fluid oil displacement fracturing fluid and preparation and use methods thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109251741A (en) * 2017-07-12 2019-01-22 中国石油化工股份有限公司 A kind of magnetic Nano oil displacement agent and preparation method thereof
CN108384573A (en) * 2018-01-31 2018-08-10 天津大学 A kind of preparation method and application of hydrophilic magnetic Nano material
CN110760297A (en) * 2019-07-11 2020-02-07 浙江海洋大学 Preparation method of magnetic nanoparticles for stabilizing emulsion
CN111253926A (en) * 2020-02-27 2020-06-09 中国石油天然气股份有限公司 Nano-magnetic fluid oil displacement fracturing fluid and preparation and use methods thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
付磊等: "改性黑磷驱油剂的制备及其性能研究", 《南京师大学报（自然科学版）》 *

Similar Documents

Publication Publication Date Title
Divandari et al. Integrating synthesized citric acid-coated magnetite nanoparticles with magnetic fields for enhanced oil recovery: Experimental study and mechanistic understanding
Chen et al. Synthesis of magnetically responsive hyperbranched polyamidoamine based on the graphene oxide: application as demulsifier for oil‐in‐water emulsions
Khoramian et al. The development of novel nanofluid for enhanced oil recovery application
CN106832159B (en) Hybrid nano particle with pH and magnetic responsiveness, preparation method thereof and application thereof in nano oil-water emulsion separation
WO2017015120A1 (en) Surfactant for enhanced oil recovery
CN113122217B (en) Carbon-based amphiphilic nano-flow for oil displacement and preparation method thereof
CN110182894B (en) Preparation method and application of magnetic carbon nanotube demulsifier
CN111978944A (en) Application of modified nano graphene oxide as chemical agent for improving recovery ratio of low-permeability reservoir
Mrlik et al. Surface-initiated atom transfer radical polymerization from graphene oxide: A way towards fine tuning of electric conductivity and electro-responsive capabilities
Duan et al. Core-shell composite nanoparticles with magnetic and temperature dual stimuli-responsive properties for removing emulsified oil
Liu et al. Experimental and molecular dynamic studies of amphiphilic graphene oxide for promising nanofluid flooding
Mu et al. Preparation and demulsification performance of modified attapulgite nanoparticle demulsifier
Gu et al. Synthesis of PPEGMEA-g-PMAA densely grafted double hydrophilic copolymer and its use as a template for the preparation of size-controlled superparamagnetic Fe 3 O 4/polymer nano-composites
Damavandi et al. Polystyrene magnetic nanocomposite blend: an effective, facile, and economical alternative in oil spill removal applications
CN112251206A (en) Magnetic nano oil displacement agent with black phosphorus as matrix and preparation method thereof
He et al. Anti-swelling mechanism of DMDACC on weathered crust elution-deposited rare earth ore
Liu et al. CO2-switchable nanohybrids for enhancing CO2 flooding in tight reservoirs: From stable colloids to a relevant viscoelastic fluid
Chen et al. Synthesis and characterization of copolymer grafted magnetic nanoparticles via surface‐initiated nitroxide‐mediated radical polymerization
Sun et al. Recovery of Au (CN) 2− with magnetic reduced graphene oxide hydrogel in aqueous leach solution
CN109455807A (en) A kind of sulfur method of high sulfur content oilfield sewage
Hosny et al. Nanotechnology Impact on Chemical-Enhanced Oil Recovery: A Review and Bibliometric Analysis of Recent Developments
CN116083066B (en) Composite flooding composition of two-dimensional nano particles and preparation method of two-dimensional nano particles
CN110105978B (en) Two-sided magnetic response particle and preparation method and application thereof
Nguyen et al. Synthesis of polymer-coated magnetic nanoparticles from red mud waste for enhanced oil recovery in offshore reservoirs
CN104014163A (en) Preparation method and application of aminoethyl aminopropyl modified ferroferric oxide

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210122

RJ01 Rejection of invention patent application after publication