CN115074097A - Fluid capable of deep profile control of inorganic particle gel and preparation method and application thereof - Google Patents
Fluid capable of deep profile control of inorganic particle gel and preparation method and application thereof Download PDFInfo
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- CN115074097A CN115074097A CN202210620301.9A CN202210620301A CN115074097A CN 115074097 A CN115074097 A CN 115074097A CN 202210620301 A CN202210620301 A CN 202210620301A CN 115074097 A CN115074097 A CN 115074097A
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- 239000012530 fluid Substances 0.000 title claims abstract description 61
- 239000010954 inorganic particle Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 42
- 238000001879 gelation Methods 0.000 title description 5
- 239000002775 capsule Substances 0.000 claims abstract description 122
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000004202 carbamide Substances 0.000 claims abstract description 31
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920000592 inorganic polymer Polymers 0.000 claims abstract description 24
- 239000007864 aqueous solution Substances 0.000 claims abstract description 12
- 239000003094 microcapsule Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 60
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 48
- 230000005284 excitation Effects 0.000 claims description 47
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 32
- 239000007771 core particle Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 29
- 239000011162 core material Substances 0.000 claims description 23
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 23
- 229920000053 polysorbate 80 Polymers 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 18
- 239000001856 Ethyl cellulose Substances 0.000 claims description 16
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 16
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 16
- 229920001249 ethyl cellulose Polymers 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 14
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 14
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 14
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 14
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims description 13
- 239000008108 microcrystalline cellulose Substances 0.000 claims description 13
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims description 13
- 229940016286 microcrystalline cellulose Drugs 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 10
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 9
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 8
- 235000019441 ethanol Nutrition 0.000 claims description 8
- 239000008399 tap water Substances 0.000 claims description 8
- 235000020679 tap water Nutrition 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 5
- 238000005538 encapsulation Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000008398 formation water Substances 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000005563 spheronization Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000013535 sea water Substances 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 229920003051 synthetic elastomer Polymers 0.000 claims 1
- 239000005061 synthetic rubber Substances 0.000 claims 1
- 230000003111 delayed effect Effects 0.000 abstract description 11
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000000499 gel Substances 0.000 description 66
- 239000003921 oil Substances 0.000 description 23
- 229920002401 polyacrylamide Polymers 0.000 description 16
- 230000000694 effects Effects 0.000 description 13
- 238000011084 recovery Methods 0.000 description 12
- 230000005465 channeling Effects 0.000 description 10
- 238000003889 chemical engineering Methods 0.000 description 8
- 239000000295 fuel oil Substances 0.000 description 8
- 230000035699 permeability Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 125000000129 anionic group Chemical group 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000012190 activator Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229920006037 cross link polymer Polymers 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010049976 Impatience Diseases 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- ABBQHOQBGMUPJH-UHFFFAOYSA-M Sodium salicylate Chemical compound [Na+].OC1=CC=CC=C1C([O-])=O ABBQHOQBGMUPJH-UHFFFAOYSA-M 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920006184 cellulose methylcellulose Polymers 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229960004025 sodium salicylate Drugs 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
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
- C09K8/50—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
-
- 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
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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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
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
The invention discloses a fluid of inorganic particle gel capable of deep profile control and a preparation method and application thereof. The invention can realize the plugging profile control of the stratum by reacting to generate inorganic gel under the alkaline condition, urea or urotropine is decomposed to form alkaline aqueous solution under the stratum temperature condition to promote inorganic polymers to generate inorganic gel, the urea or urotropine is wrapped by capsules, and the release time of the urea or urotropine in water is prolonged by utilizing the slow release performance of the microcapsules, so that the gelling time of the inorganic particle gel is delayed, the fluid has enough time to reach the deep part of the stratum, and the profile control of the inorganic particle gel in the deep part of the stratum is realized.
Description
Technical Field
The invention belongs to the technical field of profile control in the process of the oil reservoir yield increase field, and particularly relates to a fluid of inorganic particle gel capable of deep profile control, and a preparation method and application thereof.
Background
Heavy oil occupies a large proportion in oil and gas resources in the world, and hot water and steam are always the main exploitation modes for heavy oil reservoir thermal recovery. The thick oil can absorb heat after being mixed with hot fluid such as steam and the like, the viscosity of the thick oil is greatly reduced, and the thick oil has good fluidity in the stratum, so that the thick oil is easier to be exploited from the stratum. After long term heat injection (steam, hot water, etc.) development, many high permeability macropores are formed in the formation. Most of the injected steam is broken through the high-permeability pore passages in the production well prematurely, so that the injected heat directly flows out of the steam channeling well, an oil layer cannot be heated sufficiently to displace crude oil, the steam displacement is low in heat efficiency and small in swept volume, and normal exploitation of the production well and a block is affected. In addition, along with the increase of the drainage quantity of the steam channeling well, the temperature difference between injection wells and extraction wells is increased, sand production of an oil well is caused, bottom water is caused to rush in serious conditions, equipment such as a pipe column and the like is damaged besides normal production is influenced, and huge economic loss is caused.
In order to solve the problem of steam channeling in the process of extracting the heavy oil by injecting steam, a channel in a reservoir layer, which has steam channeling, needs to be effectively plugged, the seepage resistance in a high-permeability channel is increased, steam flows along a low-permeability channel which is not reached in an oil reservoir, the heavy oil in an area which is not reached is reached, and the recovery ratio of heavy oil steam extraction is improved. At present, the main methods for blocking steam channeling comprise two methods, namely mechanical blocking and chemical blocking. Mechanical plugging means plugging a steam channeling part by putting down a downhole tool, a packer and the like, but the operation difficulty is high, and the plugging effect is not ideal. In order to reduce the construction difficulty, realize deep plugging adjustment and reduce the operation cost, a chemical plugging process method is usually adopted on site at present, namely, a chemical plugging agent is injected into a production zone through a production well, the chemical agent can preferentially enter a steam channeling channel with high permeability and small seepage resistance, the steam channeling channel is plugged under the actions of blocking, impatience, adsorption and the like in rock pores and throats, the seepage resistance in the steam channeling channel is increased, the channeling of steam along a high seepage layer is effectively prevented, the steam can enter a low seepage part which is not reached before, unswept oil reservoir thick oil is developed, and the thick oil recovery rate is improved by improving the unswept efficiency.
The deep profile control technology mainly regulates the contradiction between the longitudinal direction and the transverse direction of the deep part of a reservoir by plugging the deep part with a chemical profile control agent, and can enable injected fluid to flow from a high-suction-amount high-permeability layer to a low-suction-amount middle-low-permeability layer in the deep part of a stratum, so that the sweep coefficient of the deep injected fluid is expanded, and residual oil which is not swept and used and is formed due to the difference of the physical properties of the deep part of the stratum is displaced. Generally, the action radius of deep profile control technology is more than 2 times of that of common profile control technology. The temperature in the thick oil thermal recovery process is high, so the requirement on the high temperature resistance of the chemical plugging agent after plugging is high, and the gelling time of the chemical plugging agent needs to be prolonged in order to realize deep profile control. Application publication No. CN102504777A discloses a delayed cross-linked polymer strong gel deep profile control agent and a preparation method thereof, wherein the profile control agent comprises the following raw materials: anionic polyacrylamide 0.3-0.6%, sodium dichromate 0.1-0.3%, sodium sulfite 0.15-0.25%, sodium salicylate 0.02-0.1%, and water in balance; wherein the molecular weight of the anionic polyacrylamide is 400-1000 ten thousand, and the hydrolysis degree is 25-30%. Application publication No. CN102071003A discloses a high-temperature-resistant delayed cross-linked polymer deep profile control agent, which comprises anionic partially hydrolyzed polyacrylamide, phenol, urotropine and thiourea, and the weight ratio of each component is as follows: anionic partially hydrolyzed polyacrylamide (molecular weight of 1600-. In addition to organic polymers, inorganic gels are also used as profile control agents. Application publication No. CN102504777A discloses a delayed precipitation particle gel profile control agent and a production method thereof, and the delayed precipitation particle gel profile control agent for water well profile control or oil well water shutoff is characterized by comprising the following raw materials in percentage by mass: 5 to 30 percent of iron-aluminum metal salt, 1 to 10 percent of urotropin and the balance of water; wherein the iron-aluminum metal salt is one or more of aluminum trichloride, ferric trichloride, aluminum sulfate, ferric sulfate, polymeric aluminum ferric sulfate and polymeric ferric trichloride. Journal "fine petrochemical engineering progress" published in 2017, volume 18, No. 6, a paper "development of inorganic gel deep profile control agent WJ-2 for high-temperature low-permeability reservoir", wherein polyaluminium chloride, activating agent urea and the like are adopted to prepare a temperature-resistant and salt-resistant inorganic gel deep profile control agent, and a formula of a gel system is as follows: 8 percent of polyaluminium chloride, 4 percent of urea and 0.5 percent of auxiliary agent.
From the existing deep profile control technology, the deep profile control technology mainly focuses on polyacrylamide organic gel, and the aim of deep profile control is fulfilled by chelating metal salt and delaying the crosslinking time of the metal salt and polyacrylamide. The shearing damage degree of the polyacrylamide in the blastholes pumped into the stratum and the stratum seepage is large, the molecular weight of the polyacrylamide is greatly reduced after the polyacrylamide reaches the deep part of the stratum, the gelling capability of the polyacrylamide is reduced, and the deep gelling plugging of the high-permeability stratum is not facilitated. Meanwhile, the stratum contains clay and the like, and the molecular structure characteristics of polyacrylamide and a cross-linking agent are easy to be adsorbed on the surface of the clay in the seepage process, so that the effective content of the plugging agent reaching the deep part of the stratum is reduced, and the deep part gelling plugging of the high-permeability stratum is not facilitated. Under the high-salt environmental condition of part of formation water, polyacrylamide is difficult to generate chemical crosslinking reaction with a crosslinking agent to form gel, and a high permeable layer is difficult to block at a deep part. Meanwhile, the temperature resistance of the polyacrylamide gel is poor, and the polyacrylamide gel is easy to break gel and lose the plugging property under the condition that the injection fluid adopted by heavy oil is steam or hot water, so that the application of the polyacrylamide gel in the field of heavy oil thermal recovery is limited.
The plugging profile control of the stratum can be realized by using inorganic gel generated by reacting an inorganic polymer consisting of polyaluminium chloride, or polyferric sulfate or polyaluminium ferric chloride under an alkaline condition, and the inorganic gel has a higher temperature resistance than polyacrylamide gel and is constantly and well applied to the field of heavy oil thermal recovery. The aqueous solution prepared by the inorganic polymer has low viscosity before gelling, is easy to pump, is not influenced by shearing damage and high salt content of formation water, has low price and can be used in large dose, and the use of the inorganic polymer gel is one of profile control development directions in the field of thickened oil thermal recovery. In order to delay the gel formation of the inorganic polymer under the alkaline condition, urea or urotropine is adopted to form alkalinity in an aqueous solution under the formation temperature condition as an excitant, thereby realizing the purpose of profile control, but from the current research and field application, the decomposition speed of urea or urotropine is slower at normal temperature, but after entering the stratum, the decomposition speed is higher and the alkaline environment is quickly formed under the condition of the temperature of the stratum, so the gelling time of the mixed solution formed by inorganic polymers such as polyaluminium chloride or polyferric sulfate or polyaluminium ferric chloride and urea or urotropine is still faster relative to the field engineering requirement, and the method is only suitable for the profile control of a near-wellbore area, how to further reduce the decomposition speed of the excitant such as urea or urotropin under the condition of formation temperature, thus, the delay of the formation time of the alkaline environment is one of the key technologies for realizing the deep profile control of the inorganic polymer gel.
Disclosure of Invention
The invention provides a fluid of inorganic particle gel capable of deep profile control, and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
a fluid for deep profile control of inorganic particle gel comprises an inorganic polymer gel main agent, a capsule-coated excitation system and water.
Wherein, the inorganic polymer gel main agent adopts inorganic polymer, and the inorganic polymer gel main agent comprises one or a mixture of more of polyaluminium chloride, polyferric sulfate or polyaluminium ferric chloride, and the content is 1-30% (by weight) so as to realize the total weight of the inorganic particle gel fluid for deep profile control.
Preferably, the inorganic polymeric gum base is present in an amount of 5% to 20% by weight.
Wherein, the capsule excitation system comprises capsule core particles and capsule wrappings formed by capsule walls, and the content of the capsule excitation system is 0.5 to 15 percent (by weight) so as to realize the total weight of the gel fluid of the inorganic particles for deep profile control.
Preferably, the encapsulated excitation system is present in an amount of 2% to 10% by weight.
Wherein, the capsule core particle comprises a main material, an auxiliary material and deionized water, the main material comprises one or a mixture of urea or urotropine, the content is 10-90% (weight), the auxiliary material comprises microcrystalline cellulose, hydroxypropyl methylcellulose and tween 80, wherein, the content of the microcrystalline cellulose is 5-50% (weight), the content of the hydroxypropyl methylcellulose is 0.2-5% (weight), the content of the tween 80 is 0.2-5%, the content of the deionized water is the residual amount of the main material and the auxiliary material, calculated by the total weight of the materials needed in the preparation process of the capsule core particle;
the capsule wrap formed by the capsule wall comprises main materials and a solvent, wherein the main materials adopt ethyl cellulose, the content of the ethyl cellulose is 2-20 percent (weight), the solvent consists of a mixed solution of absolute ethyl alcohol and toluene, the content of the absolute ethyl alcohol is 50-90 percent (weight), the content of the toluene is 5-30 percent (weight), and the total weight of the materials required in the preparation process of the capsule wall material is calculated
Preferably, the main material content is 20-70 wt%, the microcrystalline cellulose content is 10-40 wt%, the hydroxypropyl methylcellulose content is 0.5-3 wt%, and the tween 80 content is 0.5-3 wt%
Wherein the water comprises tap water, formation water or seawater, and the content is the residual amount of the inorganic polymer gel main agent and the coating capsule excitation system to realize the total weight of the inorganic particle gel fluid for deep profile control.
A preparation method of fluid of inorganic particle gel capable of deep profile control comprises a preparation method of a capsule excitation system and a preparation method of the fluid of the inorganic particle gel;
the preparation method of the encapsulated capsule excitation system comprises the following steps of capsule core particle preparation, capsule wall material preparation and encapsulation:
the method comprises the following steps: preparing capsule core particles: adding Tween 80 into deionized water to form Tween 80 water solution, and stirring to obtain microcrystallineRespectively adding cellulose and hydroxypropyl methylcellulose into Tween 80 aqueous solution, dissolving or dispersing the two components in Tween 80 aqueous solution, and continuously adding one or mixture of urea or urotropine and stirring; preparing capsule core particles by adopting an extrusion spheronization granulation method, namely: 1) extrusion molding: putting the prepared wet material into an extrusion bin, selecting a sieving plate with a sieve pore size of 0.5 mm at a discharge port, starting an extrusion mode, and opening cooling water circulation to reduce the temperature; the obtained strip-shaped object is not only an unshaped capsule core; 2) shaping and briquetting: pouring unformed capsule core materials into a rounding machine, enabling the unformed capsule core materials to pass through a discharge hole and a feed inlet, starting a rounding mode, adjusting the rotation rate of the rounding machine to 700-1100 revolutions per minute, and checking the rounding degree of the capsule cores until the capsule core materials are free from bonding; placing the formed capsule core back into the roller, selecting drying mode, and heating at a temperature of not higher than 120 deg.C and air inlet speed of 1m 3 /h-5m 3 Drying is carried out between hours so that the capsule core is in a dry state;
step two: preparing a capsule wall material: uniformly mixing absolute ethyl alcohol and toluene according to a preset concentration, slowly pouring ethyl cellulose into a toluene/ethanol mixed solution under the condition of stirring, placing the mixture into a constant-temperature water bath kettle at the temperature of 30-40 ℃, and uniformly stirring until the ethyl cellulose is completely dissolved in the mixed solution;
step three: placing the capsule core particles obtained in the step one in a rounding machine, then starting a coating mode, and pouring the capsule wall materials obtained in the step two into a spraying groove; then the temperature of the materials is controlled to be 20-35 ℃, the air inlet temperature is set to be 40-50 ℃, and whether the capsule core particles are uniformly coated or not is observed after the capsule wall materials are used; after preparing the microcapsule, starting a drying mode, setting the temperature to be 30-40 ℃, and taking the surface drying of the microcapsule as a standard in the drying mode; screening the capsules by using a screen mesh with the size of 40-60 meshes to remove the microcapsules with thick coatings, thus obtaining a coated capsule excitation system;
the preparation method of the inorganic particle gel fluid comprises the steps of dissolving the inorganic polymerization gel main agent in water under the stirring condition, adding the coating capsule excitation system obtained in the first step, the second step and the third step after the inorganic polymerization gel main agent is uniformly stirred, and stirring at a low speed to uniformly disperse to form the inorganic particle gel fluid for realizing the deep profile control.
The application of the fluid of the inorganic particle gel capable of deep profile control is that the fluid is sent to the underground stratum according to the method of the conventional profile control construction procedure, the fluid reaches the deep part of the stratum under the action of the displacement fluid, the inorganic particle gel is slowly gelatinized under the condition of the stratum temperature, and after the inorganic particle gel is gelatinized, the oil is extracted from the stratum according to the routine procedure after the conventional profile control construction.
The invention has the following advantages:
the fluid of the inorganic particle gel capable of deep profile control comprises an inorganic polymer gel main agent, a coating capsule excitation system and water. The inorganic polymer gel forming main agent comprises one or more of polyaluminium chloride, polyferric sulfate or polyaluminium ferric chloride, and the inorganic polymer reacts to form inorganic gel under alkaline conditions, so that plugging and profile control of a stratum can be realized, but the reaction is fast under alkaline environment conditions and the speed is difficult to control. In order to realize the gel formation of the inorganic polymer in the stratum, urea or urotropine is used for decomposing under the condition of stratum temperature to form alkaline aqueous solution to promote the inorganic polymer to form inorganic gel, but the method is only suitable for plugging a near wellbore zone. In order to further delay the gelling time of the inorganic particle gel to realize deep profile control, the decomposition speed of urea or urotropine at the temperature of the stratum needs to be prolonged, if the urea or urotropine is wrapped by a capsule, the slow release performance of the microcapsule is utilized to prolong the release time of the urea or urotropine in water, so that the gelling time of the inorganic particle gel is delayed, the fluid has enough time to reach the deep part of the stratum, and the deep profile control of the inorganic particle gel in the stratum is realized.
Detailed Description
The invention will be further described below using specific examples. However, the present invention is not limited to these specific examples.
Examples
Raw materials and sources thereof:
polyaluminum chloride (PAC): chongqing Aisen chemical Co., Ltd
Polymeric ferric sulfate (PAF): chongqing Aisen chemical Co., Ltd
Polyaluminum ferric chloride (PAFC): chongqing Aisen chemical Co., Ltd
Urea: chengdu Kelong chemical engineering Co Ltd
Urotropin: chengdu Kelong chemical engineering Co Ltd
Microcrystalline cellulose: chengdu Kelong chemical engineering Co Ltd
Hydroxypropyl methylcellulose: chengdu Kelong chemical engineering Co Ltd
Tween 80: chengdu Kelong chemical engineering Co Ltd
Ethyl cellulose: chengdu Kelong chemical engineering Co Ltd
Ethanol: chengdu Kelong chemical engineering Co Ltd
Toluene: chengdu Kelong chemical engineering Co Ltd
Deionized water: laboratory self-control
Tap water
Test performance and test method:
and (3) putting the profile control fluid in the deep part of the oil reservoir into a container at a certain temperature by adopting a test tube inversion method, taking out the fluid regularly for observation, wherein the test tube forms an angle of 45 degrees with the vertical direction, and observing the condition that the gel loses fluidity, namely the gelling time of the inorganic particle gel.
And (3) testing the plugging performance: filling a sand filling pipe with quartz sand of 40-70 meshes to form a porous medium, testing the permeability change of hot water and steam before and after inorganic gel gelling and plugging by adopting a single-pipe displacement experimental device, calculating the hot water plugging rate and the steam plugging rate of the inorganic particle gel plugging agent under different conditions according to the permeability change, wherein the higher the plugging rate is, the better the plugging effect is, and the profile control of hot water and steam for thick oil thermal recovery is facilitated.
In the formula: e w Hot water plugging rate,%; k w0 Permeability, μm, for initial hot water measurement 2 ；K w1 Permeability in μm for hot water after gelation 2 。
In the formula: e g Steam plugging rate,%; k g0 Permeability, μm, for initial hot water measurement 2 ；K g1 Permeability in μm for hot water after gelation 2 。
Example 1 an oil reservoir deep profile control fluid comprises an inorganic polymer synthetic gel main agent and a coating capsule excitation system, wherein the preparation method of the coating capsule excitation system comprises capsule core particle preparation, capsule wall material preparation and a coating process:
step one, preparing capsule core particles: adding tween 80 into deionized water to form tween 80 aqueous solution, respectively adding microcrystalline cellulose and hydroxypropyl methylcellulose into tween 80 aqueous solution under stirring to dissolve or disperse the two components in tween 80 aqueous solution, and continuously adding one or mixture of urea or urotropine and stirring. Preparing capsule core particles by adopting an extrusion spheronization granulation method, namely: 1) extrusion molding: and putting the prepared wet material into an extrusion bin, selecting a sieving plate with a sieve pore size of 0.5 mm at a discharge port, starting an extrusion mode, and opening cooling water circulation to reduce the temperature. The obtained strip-shaped object is not only an unshaped capsule core; 2) shaping and briquetting: the unformed capsule core material is poured into a rounding machine and then passes through a discharge hole and a feed inlet, a rounding mode is started, the rotation speed of the rounding machine is adjusted to 700-1100 revolutions per minute, and the rounding degree of the capsule core is checked at a proper time until the capsule core material is basically free from bonding phenomenon. Placing the formed capsule core back into the roller, selecting drying mode, and heating at a temperature of not higher than 120 deg.C and air inlet speed of 1m 3 H to 5m 3 Drying is carried out for the capsule core to be in a dry state.
Step two, preparing a capsule wall material: mixing anhydrous ethanol and toluene according to a predetermined concentration, slowly pouring ethyl cellulose into the toluene/ethanol mixed solution under stirring, placing in a constant temperature water bath (30-40 ℃) and stirring uniformly until the ethyl cellulose is completely dissolved in the mixed solution.
Step three, the wrapping process: and (3) placing the rounded capsule core into a rounding machine, then starting a coating mode, and pouring the coating liquid into a spraying groove. Then the temperature of the materials is controlled to be 20-35 ℃, the temperature of the air inlet is set to be 40-50 ℃, and whether the capsule core is uniformly coated or not is observed after the coating solution is used. After preparing the microcapsule, starting a drying mode, setting the temperature at 30-40 ℃, and taking the surface drying of the microcapsule as a standard in the drying mode. And screening the capsules by using a screen with the size of 40-60 meshes to remove the microcapsules with thick coatings, thus obtaining a coated capsule excitation system.
A capsule-encapsulating excitation system I:
the capsule core particle comprises the following components in percentage by weight: the urea content was 50 wt%, the microcrystalline cellulose content was 10 wt%, the hydroxypropylmethylcellulose content was 1.5 wt%, the tween 80 content was 1.5 wt%, and the deionized water content was 37 wt%. Based on the total weight of material required during the preparation of the core particles.
The capsule wall material comprises the following components in percentage by weight: the ethyl cellulose content was 10 wt%, the ethanol content was 75 wt%, and the toluene content was 15 wt%. Based on the total weight of the materials required during the preparation process of the capsule wall material.
And (3) preparing the mixture ratio in the encapsulated capsule excitation system I according to the operation methods of S1 capsule core particle preparation, S2 capsule wall material preparation and S3 encapsulation process to obtain the encapsulated capsule excitation system I.
And (3) coating a capsule excitation system II:
the capsule core particle comprises the following components in percentage by weight: the urea content was 60 wt%, the microcrystalline cellulose content was 15 wt%, the hydroxypropylmethylcellulose content was 1.5 wt%, the tween 80 content was 1.5 wt%, and the deionized water content was 22 wt%. Based on the total weight of material required during the preparation of the core particles.
The capsule wall material comprises the following components in percentage by weight: the ethyl cellulose content was 12 wt%, the ethanol content was 73 wt%, and the toluene content was 15 wt%. Based on the total weight of the materials required during the preparation process of the capsule wall material.
And (3) preparing the mixture ratio in the encapsulated capsule excitation system II according to the operation methods of S1 capsule core particle preparation, S2 capsule wall material preparation and S3 encapsulation process to obtain the encapsulated capsule excitation system II.
A capsule-encapsulating excitation system III:
the capsule core particle comprises the following components in percentage by weight: the content of urotropin was 65 wt%, the content of microcrystalline cellulose was 10 wt%, the content of hydroxypropylmethyl cellulose was 2.0 wt%, the content of tween 80 was 2.0 wt%, and the content of deionized water was 21 wt%. Based on the total weight of material required during the preparation of the core particles.
The capsule wall material comprises the following components in percentage by weight: the ethyl cellulose content was 15 wt%, the ethanol content was 70 wt%, and the toluene content was 15 wt%. Based on the total weight of the materials required during the preparation process of the capsule wall material.
And (3) preparing the mixture ratio in the encapsulated capsule excitation system III according to the operation methods of S1 capsule core particle preparation, S2 capsule wall material preparation and S3 encapsulation process to obtain the encapsulated capsule excitation system III.
A capsule-encapsulating excitation system IV:
the capsule core particle comprises the following components in percentage by weight: the content of urotropin is 20 wt%, the content of urea is 25 wt%, the content of microcrystalline cellulose is 10 wt%, the content of hydroxypropyl methylcellulose is 1.5 wt%, the content of tween 80 is 1.5 wt%, and the content of deionized water is 21 wt%. Based on the total weight of material required during the preparation of the core particles.
The capsule wall material comprises the following components in percentage by weight: the ethyl cellulose content was 15 wt%, the ethanol content was 70 wt%, and the toluene content was 15 wt%. Based on the total weight of the materials required during the preparation process of the capsule wall material.
And (3) preparing the coating capsule excitation system IV according to the mixture ratio in the S1 capsule core particle preparation, the S2 capsule wall material preparation and the S3 coating process operation method to obtain the coating capsule excitation system IV.
Example 2: 10g of polymeric aluminum is dissolved in 83g of tap water under the stirring condition, 7g of encapsulated capsule excitation system I is added after the polymeric aluminum is uniformly stirred, and the mixture is uniformly dispersed by low-speed stirring to form the oil reservoir deep profile control fluid. To compare the effect of delayed inorganic particle gels, a control was made with the same amount of urea as the activator in the encapsulated excitation system I. The capsule-wrapped excitation system I serving as an excitant can prolong the gelling time of the inorganic polyaluminium particle gel under the high-temperature condition, and the plugging effect on hot water and steam in a porous medium is better and close to that of profile control fluid using urea with the same content as the excitant.
Different temperature gelatinizing time comparison and plugging performance
Example 3: under the condition of stirring, 15g of polymeric ferric sulfate is dissolved in 75g of tap water, 10g of encapsulated capsule excitation system II is added after the polymeric aluminum is uniformly stirred, and the mixture is uniformly stirred at a low speed and dispersed to form the thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid. To compare the effect of delayed inorganic particle gels, a profile control fluid with the same amount of urea as the activator in encapsulated excitation system II was used for comparison. The capsule-wrapped excitation system II serving as an excitant can prolong the gelling time of the inorganic polyaluminium particle gel under the high-temperature condition, and the plugging effect on hot water and steam in a porous medium is better and close to that of profile control fluid using urea with the same content as the excitant.
Different temperature gelatinizing time comparison and plugging performance
Example 4: 8g of polyaluminum ferric chloride is dissolved in 75g of tap water under the stirring condition, 5g of encapsulated capsule excitation system III is added after the polyaluminum is uniformly stirred, and the mixture is uniformly stirred at low speed and dispersed to form the thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid. To compare the effect of delayed inorganic particle gels, a profile control fluid encapsulating the same amount of urotropin in capsule challenge system III as the challenge agent was used for comparison. The capsule-wrapped excitation system III serving as an excitant can prolong the gelling time of inorganic polyaluminium particle gel under a high-temperature condition, and the plugging effect on hot water and steam in a porous medium is better and close to that of profile control fluid using urotropine with the same content as the excitant.
Different temperature gelatinizing time comparison and plugging performance
Example 5: 10g of polyaluminium chloride is dissolved in 82g of tap water under the stirring condition, 8g of encapsulated capsule excitation system IV is added after the polyaluminium chloride is uniformly stirred, and the mixture is uniformly stirred at a low speed and dispersed to form the thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid. To compare the effect of delayed inorganic particle gelation, a profile control fluid encapsulating the same amount of urea and urotropine mixture in capsule challenge system IV as the challenge was used for comparison. The capsule-wrapped excitation system IV serving as an excitant can prolong the gelling time of the inorganic polyaluminium particle gel under the high-temperature condition, and the plugging effect on hot water and steam in a porous medium is better and close to the plugging effect of profile control fluid with the same content of a mixture of urea and urotropine serving as the excitant.
Different temperature gelatinizing time comparison and plugging performance
Example 6: dissolving 12g of polyaluminum ferric chloride in 75g of tap water under the condition of stirring, adding 8g of encapsulated capsule excitation system II after the polyaluminum is uniformly stirred, and uniformly stirring and dispersing at low speed to form the thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid. To compare the effect of delayed inorganic particle gels, a profile control fluid with the same amount of urea as the activator in encapsulated excitation system II was used for comparison. The capsule-wrapped excitation system II serving as an excitant can prolong the gelling time of the inorganic polyaluminium particle gel under the high-temperature condition, and the plugging effect on hot water and steam in a porous medium is better and close to that of profile control fluid using urea with the same content as the excitant.
Different temperature gelatinizing time comparison and plugging performance
It is noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A fluid capable of deep profile control of inorganic particle gel is characterized in that: comprises inorganic polymer synthetic glue main agent, a coating capsule excitation system and water.
2. The fluid of claim 1, wherein the inorganic particulate gel is deep-tailorable: the inorganic polymer gel forming main agent adopts inorganic polymer, and the inorganic polymer gel forming main agent comprises one or more of polyaluminium chloride, polyferric sulfate or polyaluminium ferric chloride, and the content is 1-30% (by weight) so as to realize the total weight of the inorganic particle gel fluid for deep profile control.
3. The fluid of claim 2, wherein the inorganic particulate gel is deep-profile-adjustable: the content of the inorganic polymer synthetic rubber main agent is 5 to 20 percent (weight).
4. The fluid of claim 1, wherein the inorganic particulate gel is deep-tailorable: the capsule-coated excitation system comprises capsule cores and capsule coatings formed by capsule walls, and the content of the capsule-coated excitation system is 0.5-15% (by weight) so as to realize the total weight of the deep profile control inorganic particle gel fluid.
5. The fluid of claim 4, wherein the inorganic particulate gel is deep-profile-adjustable: the content of the encapsulated capsule excitation system is 2-10% (by weight).
6. The fluid of claim 4, wherein the inorganic particulate gel is deep-profile-adjustable: the capsule core particles comprise main materials, auxiliary materials and deionized water, wherein the main materials comprise one or a mixture of urea or urotropine, the content of the urea or the urotropine is 10-90 percent (weight), the auxiliary materials comprise microcrystalline cellulose, hydroxypropyl methylcellulose and tween 80, the content of the microcrystalline cellulose is 5-50 percent (weight), the content of the hydroxypropyl methylcellulose is 0.2-5 percent (weight), the content of the tween 80 is 0.2-5 percent, the content of the deionized water is the residual amount of the main materials and the auxiliary materials, and the total weight of the materials required in the preparation process of the capsule core particles is calculated;
the capsule wrap formed by the capsule wall comprises main materials and a solvent, wherein the main materials adopt ethyl cellulose, the content of the ethyl cellulose is 2-20% (by weight), the solvent consists of a mixed solution of absolute ethyl alcohol and toluene, the content of the absolute ethyl alcohol is 50-90% (by weight), the content of the toluene is 5-30% (by weight), and the total weight of the materials required in the preparation process of the capsule wall material is calculated.
7. The fluid of claim 6, wherein the inorganic particulate gel for deep profile control comprises: the main material content is 20-70 wt%, the microcrystalline cellulose content is 10-40 wt%, the hydroxypropyl methyl cellulose content is 0.5-3 wt%, and the Tween 80 content is 0.5-3 wt%;
the ethyl cellulose content is 5-15 wt%, the absolute ethyl alcohol content is 60-85 wt%, and the toluene content is 10-20 wt%.
8. The fluid of claim 1, wherein the fluid is selected from the group consisting of: the water comprises tap water, formation water or seawater, and the content is the residual amount of the inorganic polymer gel main agent and the coating capsule excitation system, so as to realize the total weight of the deep profile control inorganic particle gel fluid.
9. A method for preparing a fluid of an inorganic particle gel capable of deep profile control is characterized by comprising the following steps: comprises a preparation method of a capsule-wrapping excitation system and a preparation method of inorganic particle gel fluid;
the preparation method of the encapsulated capsule excitation system comprises the following steps of capsule core particle preparation, capsule wall material preparation and encapsulation:
the method comprises the following steps: preparing capsule core particles: adding tween 80 into deionized water to form tween 80 aqueous solution, respectively adding microcrystalline cellulose and hydroxypropyl methylcellulose into tween 80 aqueous solution under stirring to dissolve or disperse the two components in tween 80 aqueous solution, and continuously adding one or mixture of urea or urotropine and stirring; preparing capsule core particles by adopting an extrusion spheronization granulation method, namely: 1) extrusion molding: putting the prepared wet material into an extrusion bin, selecting a sieving plate with a sieve pore size of 0.5 mm at a discharge port, starting an extrusion mode, and opening cooling water circulation to reduce the temperature; the obtained strip-shaped object is not the capsule core which is not formed; 2) shaping and briquetting: pouring unformed capsule core materials into a rounding machine, enabling the unformed capsule core materials to pass through a discharge hole and a feed inlet, starting a rounding mode, adjusting the rotation rate of the rounding machine to 700-1100 revolutions per minute, and checking the rounding degree of the capsule cores until the capsule core materials are free from bonding; placing the formed capsule core back into the roller, selecting drying mode, and heating at a temperature of not higher than 120 deg.C and air inlet speed of 1m 3 /h-5m 3 Drying is carried out between hours so that the capsule core is in a dry state;
step two: preparing a capsule wall material: uniformly mixing absolute ethyl alcohol and toluene according to a preset concentration, slowly pouring ethyl cellulose into a toluene/ethanol mixed solution under the condition of stirring, placing the mixture into a constant-temperature water bath kettle at the temperature of 30-40 ℃, and uniformly stirring until the ethyl cellulose is completely dissolved in the mixed solution;
step three: placing the capsule core particles obtained in the step one in a rounding machine, then starting a coating mode, and pouring the capsule wall materials obtained in the step two into a spraying groove; then the temperature of the materials is controlled to be 20-35 ℃, the air inlet temperature is set to be 40-50 ℃, and whether the capsule core particles are uniformly coated or not is observed after the capsule wall materials are used; after preparing the microcapsule, starting a drying mode, setting the temperature to be 30-40 ℃, and taking the surface drying of the microcapsule as a standard in the drying mode; screening the capsules by using a screen mesh with the size of 40-60 meshes to remove the microcapsules with thick coatings, thus obtaining a coated capsule excitation system;
the preparation method of the inorganic particle gel fluid comprises the steps of dissolving the inorganic polymerization gel main agent in water under the stirring condition, adding the coating capsule excitation system obtained in the first step, the second step and the third step after the inorganic polymerization gel main agent is uniformly stirred, and stirring at a low speed to uniformly disperse to form the inorganic particle gel fluid for realizing the deep profile control.
10. The application of the fluid of the inorganic particle gel capable of deep profile control is characterized in that: and (3) conveying the fluid into an underground stratum according to a method of a conventional profile control construction procedure, slowly gelatinizing the inorganic particle gel under the condition of stratum temperature after the fluid reaches the deep part of the stratum under the action of a displacement fluid, and after the inorganic particle gel is gelatinized, extracting oil from the stratum according to the routine after the conventional profile control construction.
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