CN116606117A - Degradable coal ash oil-water interface separator and preparation method and application thereof - Google Patents
Degradable coal ash oil-water interface separator and preparation method and application thereof Download PDFInfo
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- CN116606117A CN116606117A CN202310515009.5A CN202310515009A CN116606117A CN 116606117 A CN116606117 A CN 116606117A CN 202310515009 A CN202310515009 A CN 202310515009A CN 116606117 A CN116606117 A CN 116606117A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 239000010883 coal ash Substances 0.000 title claims description 16
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000010881 fly ash Substances 0.000 claims abstract description 41
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims abstract description 22
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims abstract description 22
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 20
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004202 carbamide Substances 0.000 claims abstract description 17
- 238000005192 partition Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003999 initiator Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 239000002332 oil field water Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000010790 dilution Methods 0.000 abstract description 2
- 239000012895 dilution Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 12
- 239000003921 oil Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000033558 biomineral tissue development Effects 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009974 thixotropic effect Effects 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a degradable fly ash oil-water interface separator, a preparation method and application thereof. The partition board consists of the following raw materials in parts by weight: 10-20 parts of fly ash, 20-30 parts of polyaluminium chloride, 3-5 parts of urea, 2-4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5-1 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100. The water shutoff system of the invention is easy to prepare, has wide sources of raw materials, good injectability and construction workersThe process is simple, the cost is low, and the oil-water interface can be automatically spread; the adhesive has the advantages of high viscosity and dilution resistance before curing, and has the advantage of right-angle curing; the compressive strength of the separator is greatly increased after solidification; meanwhile, the temperature resistance and the salt resistance of the separator are strong, and the density of the separator is 1.05-1.13g/cm 3 Is adjustable and controllable, can be degraded in a strong acid environment, and is beneficial to protecting stratum environment.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a degradable fly ash oil-water interface separator, a preparation method and application thereof.
Background
Karst cave reservoirs are very widely distributed throughout the world. The heterogeneity of the oil reservoir is extremely strong, the occurrence state and the communication relation of oil and water are complex, and the difficulty of the water shutoff technology is far higher than that of the conventional sandstone oil reservoir and other carbonate oil reservoirs. The artificial partition board type water blocking method is probably the most effective water blocking method at present, and the artificial partition board established in the stratum can be used for blocking specific water outlet positions.
At present, the oilfield water shutoff agent is commonly used as polymer gel, precipitation type water shutoff agent and conventional cement. Polymer gel can be dissolved under the stratum conditions of high temperature and high salt, and the solution viscosity is high, and the pumping resistance is high; the strength of the precipitation type water shutoff agent is low; conventional cement is easy to leak, and the water blocking radius is small; so the conventional water shutoff technology is not suitable for fracture-cavity oil reservoirs with high temperature and high mineralization.
CN202010997784.5 discloses a selective water plugging system for karst cave oil reservoir density, which comprises, by mass, 50-75 parts of super absorbent resin, 100-150 parts of ultrafine curable particles, 42-50 parts of micro-silicon, 5-10 parts of dispersing agent, 1-5 parts of retarder and 1000-1200 parts of formation water; the super absorbent resin is a hydrophilic and lipophilic water absorbent resin with volume expansion times larger than a specific threshold value; the overall density of the water shutoff system is 1.05-1.14g/cm 3 . Spreading the oil-water interface in the karst cave, gradually solidifying, forming a baffle plate on the oil-water interface, establishing a shielding, adjusting a flow field, controlling the flow of the lower water body, and achieving precipitation increaseThe purpose of the oil. The system has adjustable density, moderate compressive strength and obvious water shutoff effect. However, in the environment of high temperature and high salt, the water blocking effect is obviously reduced, and the water blocking agent has no degradability. CN201210247170.0 discloses a carbonate oil well density selective water shutoff agent, which comprises, by weight, 100 parts of cement, 60-75 parts of fly ash, 50-58 parts of clay, 52-62 parts of micro silicon, 5-8 parts of early strength agent, 16-28 parts of filtrate reducer, and 1100-1200 parts of water. And a water blocking baffle is built between oil-water interfaces to ensure the solidification effect. The plugging agent has strong compressive strength and obvious water plugging effect, but the water plugging effect is obviously reduced under the environment of high temperature and high salt, and the plugging agent has no degradability. CN201610296608.2 discloses a polysaccharide polymer water-plugging gel, which consists of the following components in percentage by mass: 2.5 to 5 percent of polysaccharide main agent, 1 to 2 percent of cross-linking agent, 1 to 3 percent of cosolvent, 0 to 10 percent of gel modifier and the balance of water, wherein the total of the components is 100 percent. The gel system has wide temperature application range, and can be used for water shutoff operation of high-temperature oil reservoirs and low-temperature oil reservoirs; the final setting strength can reach the grade I of visual code; has good long-term stability; the gel system is biodegradable. But the system has obvious reduction of the environmental effect under the high mineralization degree.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides a degradable fly ash oil-water interface baffle and a preparation method and application thereof, and solves the technical problems that a water shutoff system in the prior art is high in cost, small in shutoff strength, not suitable for an ultrahigh-temperature high-salt oil reservoir and not degradable.
In a first aspect, the invention provides a degradable coal ash oil-water interface baffle which is prepared from the following raw materials in parts by weight: 10-20 parts of fly ash, 20-30 parts of polyaluminium chloride, 3-5 parts of urea, 2-4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5-1 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100.
In a second aspect, the invention provides a preparation method of a degradable fly ash oil-water interface separator, which comprises the following steps:
uniformly mixing fly ash, polyaluminum chloride, urea, N-dimethylacrylamide/acryloylmorpholine binary polymer, silica sol and water, and then solidifying to obtain the degradable fly ash oil-water interface separator.
In a third aspect, the invention provides an application of a degradable coal ash oil-water interface baffle, which is applied to oilfield water shutoff.
Compared with the prior art, the invention has the beneficial effects that:
the invention forms a water shutoff system suspending on an oil-water interface based on a solid-liquid interface diffusion double electric layer theory and by combining methods of complexation control, ion balance and the like; the water shutoff system is easy to prepare, wide in raw material source, good in injectability, simple in construction process and low in cost, can be automatically spread on an oil-water interface, and then is gradually solidified to form a baffle plate on the oil-water interface; the adhesive has the advantages of high viscosity and dilution resistance before curing, and has the advantage of right-angle curing; the compressive strength after solidification is 1.2MPa-6.8MPa, the maximum plugging pressure gradient can reach 86MPa/m, and the compressive strength of the partition plate is greatly increased; meanwhile, the separator has strong temperature resistance and salt resistance, the temperature resistance can reach more than 170 ℃, the salt resistance can reach more than 250000mg/L, and the new breakthrough of the temperature resistance and salt resistance of the particle self-curing plugging agent is realized; the density of the separator is 1.05-1.13g/cm 3 Is adjustable and controllable, can be degraded in a strong acid environment, and is beneficial to protecting stratum environment.
Drawings
FIG. 1 shows the change trend of the mass of the degradable fly ash oil-water interface separator according to the embodiment 1-3 of the invention along with the temperature;
FIG. 2 shows the variation trend of the quality of the degradable fly ash oil-water interface separator according to the mineralization degree in the embodiment 1-3;
FIG. 3 shows the variation trend of the mass of the degradable fly ash oil-water interface separator of the embodiment 1-3 under the condition of strong acid and high temperature;
FIG. 4 is a stress-strain curve of the degradable fly ash oil-water interfacial separator of example 2 and comparative examples 1-3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In a first aspect, the invention provides a degradable coal ash oil-water interface baffle which is prepared from the following raw materials in parts by weight: 10-20 parts of fly ash, 20-30 parts of polyaluminium chloride, 3-5 parts of urea, 2-4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5-1 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100.
In the invention, fly ash is used as a main body, urea and silica sol are used as curing agents. Polyaluminium chloride and urea form gel through hydration; fly ash is charged because of particles, and forms a stable framework material through hydrogen bonding; the N, N-dimethyl acrylamide/acryloylmorpholine binary polymer has high-temperature thixotropic property, and the whole is changed into a thixotropic framework material after being added, so that the separator has excellent salt resistance and temperature resistance, and the compressive strength of the separator is further improved; in addition, the silica sol has a strengthening effect, so that the whole is more stable. The invention can realize the density of the baffle plate of 1.05-1.13g/cm through the selection of the proportion of the raw materials 3 Is adjustable and controllable, and is beneficial to forming a baffle plate on an oil-water interface. In addition, the inventor finds that before the N, N-dimethylacrylamide/acryloylmorpholine binary polymer is added, the mixed solution needs to be heated in an oven at 170 ℃ for 4 hours to form a separator, and the compression strength after solidification is 5.5MPa at the maximum; after the polymer is added, the separator can be formed only by 3 hours, and the maximum curing compressive strength of the separator is 6.8MPa. Therefore, the addition of the N, N-dimethylacrylamide/acryloylmorpholine binary polymer can also shorten the curing time and improve the curing effect.
In the invention, the fly ash is a main byproduct of coal resource utilization, and the fly ash can be subjected to impurity removal, cleaning and drying treatment sequentially as required before use.
In this embodiment, the N, N-dimethylacrylamide/acryloylmorpholine binary polymer is obtained by mixing N, N-dimethylacrylamide with acryloylmorpholine and reacting under the action of an initiator. Wherein, the mass ratio of the N, N-dimethylacrylamide to the acryloylmorpholine is 1: (0.5-2), further 1:1, a step of; the initiator is ammonium persulfate, and the addition amount of the initiator accounts for 0.05-0.1% of the mass of the monomer; the reaction temperature is 40-55 ℃ and the reaction time is 2-3h.
In this embodiment, the silica content in the silica sol is 20 to 40%; the alkalization degree of the polyaluminum chloride is 40-90%, and the content of the alumina is 10-32%.
In some embodiments of the invention, the degradable fly ash oil-water interface separator consists of the following raw materials in parts by weight: 15 parts of fly ash, 25 parts of polyaluminum chloride, 4 parts of urea, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100.
In a second aspect, the invention provides a preparation method of a degradable fly ash oil-water interface separator, which comprises the following steps:
uniformly mixing fly ash, polyaluminum chloride, urea, N-dimethylacrylamide/acryloylmorpholine binary polymer, silica sol and water, and then solidifying to obtain the degradable fly ash oil-water interface separator.
In this embodiment, the curing temperature is 150-200deg.C, further 170 deg.C; the curing time is 2-6 hours, and further 3 hours.
In a third aspect, the invention provides an application of a degradable coal ash oil-water interface baffle, which is applied to oilfield water shutoff.
In the following embodiments of the present invention, for avoiding redundancy, some raw materials are summarized as follows:
polyaluminum chloride: high-purity polyaluminium chloride produced by Airfok has an alkalization degree of 90% and an alumina content of 30%;
silica sol: the silicon dioxide content is 30% of Shandong Baite New Material Co., ltd;
n, N-dimethylacrylamide/acryloylmorpholine binary polymer: mixing N, N-dimethyl acrylamide and acryloylmorpholine in a mass ratio of 1:1, adding ammonium persulfate accounting for 0.08% of the mass of the monomer, stirring and heating to 50 ℃, reacting for 2 hours, and cooling to obtain the product.
Example 1
(1) Mixing 20 parts of fly ash, 30 parts of polyaluminium chloride, 4 parts of urea, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100;
(2) And after the mixture is fully dissolved, placing the mixture into a baking oven at 170 ℃, and heating for 3 hours to form the degradable coal ash oil-water interface partition plate.
Example 2
(1) Mixing 15 parts of fly ash, 25 parts of polyaluminium chloride, 4 parts of urea, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100;
(2) And after the mixture is fully dissolved, placing the mixture into a baking oven at 170 ℃, and heating for 3 hours to form the degradable coal ash oil-water interface partition plate.
Example 3
(1) Mixing 10 parts of fly ash, 20 parts of polyaluminium chloride, 4 parts of urea, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100;
(2) And after the mixture is fully dissolved, placing the mixture into a baking oven at 170 ℃, and heating for 3 hours to form the degradable coal ash oil-water interface partition plate.
Comparative example 1
(1) Mixing 15 parts of fly ash, 25 parts of polyaluminium chloride, 4 parts of urea, 0.5 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100;
(2) And after the mixture is fully dissolved, placing the mixture into a baking oven at 170 ℃ and heating for 4 hours to form the degradable coal ash oil-water interface partition board.
Comparative example 2
(1) Mixing 15 parts of fly ash, 25 parts of polyaluminum chloride, 4.5 parts of urea, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer and the balance of water, wherein the sum of the parts by weight of the components is 100;
(2) And after the mixture is fully dissolved, placing the mixture into a baking oven at 170 ℃, and heating for 3 hours to form the degradable coal ash oil-water interface partition plate.
Comparative example 3
(1) Mixing 15 parts of fly ash, 25 parts of polyaluminium chloride, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 4.5 parts of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100;
(2) And after the mixture is fully dissolved, placing the mixture into a baking oven at 170 ℃, and heating for 3 hours to form the degradable coal ash oil-water interface partition plate.
Test group 1
The separators formed in examples 1 to 3 above were placed in equal parts in a drying oven at 25℃at 50℃at 70℃at 90℃at 110℃at 130℃at 150℃at 170℃for 24 hours, and the mass of the separator was measured as shown in FIG. 1.
Referring to fig. 1, it can be seen from fig. 1 that the separator formed in example 2 has moderate quality, and the separator formed in examples 1-3 has substantially unchanged quality along with the increase of temperature, which indicates that the oil-water interface separator provided by the invention has good temperature resistance.
Test group 2
The separators formed in examples 1 to 3 above were respectively put in equal parts into aqueous solutions having mineralizations of 100000mg/L, 150000mg/L, 200000mg/L, 250000mg/L, respectively, and after the whole was put in a drying oven at 90℃for 12 hours, the final separator mass was measured, as shown in FIG. 2.
Referring to fig. 2, it can be seen from fig. 2 that the quality of the separator formed in example 2 is moderate, and the quality of the separator formed in examples 1-3 remains unchanged along with the increase of mineralization, which indicates that the oil-water interface separator provided by the invention has good salt tolerance.
Test group 3
The separators formed in examples 1-3 above were each mixed with a sufficient amount of a conventional earth acid solution (3% hf+12% hcl), heated in an oil bath at 110 ℃ for 8 hours, and the final separator mass was measured as shown in fig. 3.
Referring to fig. 3, it can be seen from fig. 3 that the separators formed in examples 1-3 are easily degraded under the action of strong acid at high temperature, which indicates that the oil-water interface separator provided by the invention has significant degradation capability under the action of strong acid in stratum environment.
Test group 4
The separators formed in example 2 and comparative examples 1 to 3, respectively, were placed in a compressive strength tester, and the stress-strain curves of the separators were recorded, as shown in fig. 4.
Referring to fig. 4, it can be seen from fig. 4 that the compressive strength of the separator formed after omitting the binary copolymer (comparative example 1), omitting the silica sol (comparative example 2) and omitting the urea (comparative example 3) is reduced to different degrees, which indicates that the binary copolymer, the silica sol and the urea can exert their synergistic effect in the system of the present invention, and the compressive strength of the separator is significantly improved.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (10)
1. The degradable coal ash oil-water interface partition board is characterized by comprising the following raw materials in parts by weight: 10-20 parts of fly ash, 20-30 parts of polyaluminium chloride, 3-5 parts of urea, 2-4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5-1 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100.
2. The degradable fly ash oil-water interface separator of claim 1 wherein the silica content of the silica sol is 20-40%.
3. The degradable fly ash oil-water interface separator according to claim 1, wherein the basification degree of the polyaluminum chloride is 40-90%, and the alumina content is 10-32%.
4. The degradable fly ash oil-water interface separator of claim 1 wherein the N, N-dimethylacrylamide/acryloylmorpholine binary polymer is obtained by mixing N, N-dimethylacrylamide with acryloylmorpholine and reacting under the action of an initiator.
5. The degradable fly ash oil-water interface separator according to claim 4, wherein the mass ratio of the N, N-dimethylacrylamide to the acryloylmorpholine is 1: (0.5-2); the initiator is ammonium persulfate, and the addition amount of the initiator accounts for 0.05-0.1% of the mass of the monomer; the temperature of the reaction is 40-55 ℃, and the reaction time is 2-3h.
6. The degradable fly ash oil-water interface baffle according to claim 1, wherein the degradable fly ash oil-water interface baffle is composed of the following raw materials in parts by weight: 15 parts of fly ash, 25 parts of polyaluminum chloride, 4 parts of urea, 4 parts of N, N-dimethylacrylamide/acryloylmorpholine binary polymer, 0.5 part of silica sol and the balance of water, wherein the sum of the parts by weight of the components is 100.
7. A method for preparing the degradable coal ash oil-water interface separator according to any one of claims 1-6, comprising the following steps:
uniformly mixing fly ash, polyaluminum chloride, urea, N-dimethylacrylamide/acryloylmorpholine binary polymer, silica sol and water, and then solidifying to obtain the degradable fly ash oil-water interface separator.
8. The method for preparing the degradable coal ash oil-water interface separator according to claim 7, wherein the curing temperature is 150-200 ℃, and the curing time is 2-6h.
9. The method for preparing the degradable coal ash oil-water interface separator according to claim 7, wherein the curing temperature is 170 ℃, and the curing time is 3 hours.
10. Use of a degradable fly ash oil water interface separator according to any of claims 1-6, wherein the degradable fly ash oil water interface separator is used for oilfield water shutoff.
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