CN115074097B - Fluid capable of deep profile control of inorganic particle gel, preparation method and application thereof - Google Patents
Fluid capable of deep profile control of inorganic particle gel, preparation method and application thereof Download PDFInfo
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- CN115074097B CN115074097B CN202210620301.9A CN202210620301A CN115074097B CN 115074097 B CN115074097 B CN 115074097B CN 202210620301 A CN202210620301 A CN 202210620301A CN 115074097 B CN115074097 B CN 115074097B
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- 239000012530 fluid Substances 0.000 title claims abstract description 55
- 239000010954 inorganic particle Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 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 61
- 239000000463 material Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 230000005284 excitation Effects 0.000 claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 42
- 239000004202 carbamide Substances 0.000 claims abstract description 33
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 29
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 13
- 229920000592 inorganic polymer Polymers 0.000 claims abstract description 12
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 11
- 239000003094 microcapsule Substances 0.000 claims abstract description 11
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 48
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 32
- 239000007771 core particle Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 28
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 22
- 229920000053 polysorbate 80 Polymers 0.000 claims description 22
- 238000005538 encapsulation Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 21
- 239000011162 core material Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 17
- 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
- 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
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims description 14
- 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
- 239000008108 microcrystalline cellulose Substances 0.000 claims description 14
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims description 14
- 229940016286 microcrystalline cellulose Drugs 0.000 claims description 14
- 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
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 8
- 235000019441 ethanol Nutrition 0.000 claims description 8
- 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 claims description 8
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 8
- 239000008399 tap water Substances 0.000 claims description 8
- 235000020679 tap water Nutrition 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000011148 porous material Substances 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
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 claims description 2
- 239000013535 sea water Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 229920000136 polysorbate Polymers 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 239000007864 aqueous solution Substances 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- 239000000499 gel Substances 0.000 description 81
- 239000003921 oil Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 16
- 229920002401 polyacrylamide Polymers 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000011084 recovery Methods 0.000 description 11
- 230000005465 channeling Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000003111 delayed effect Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000002035 prolonged effect Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 125000000129 anionic group Chemical group 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 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
- 238000004132 cross linking Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 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
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction 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
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 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
- 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
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 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
- 238000011056 performance test Methods 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
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 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
- 239000007921 spray Substances 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
The application discloses a fluid of deep profile control inorganic particle gel, a preparation method and application thereof, wherein the fluid comprises an inorganic polymeric gel main agent and a capsule wrapping excitation system, the polymeric gel main agent comprises one or more of polyaluminum chloride or polyferric sulfate or polyaluminum ferric chloride, the capsule wrapping excitation system comprises one or two of urea or urotropine, and the capsule wrapping material is formed by mixing and processing. The application can realize the blocking and profile control of the stratum by reacting under the alkaline condition to generate inorganic gel, adopts urea or urotropine to decompose under the stratum temperature condition to form alkaline aqueous solution to promote inorganic polymer to generate inorganic gel, adopts the capsule to wrap the urea or urotropine, and prolongs the release time of the urea or urotropine in water by utilizing the slow release property of the microcapsule, thereby delaying the gel forming time of inorganic particle gel, enabling the fluid to have enough time to reach the deep part of the stratum and realizing the deep profile control of the inorganic particle gel in the stratum.
Description
Technical Field
The application belongs to the technical field of profile control in the oil reservoir yield increasing field process, and particularly relates to fluid capable of deep profile control of inorganic particle gel, and a preparation method and application thereof.
Background
Heavy oil occupies a large proportion in world oil and gas resources, and hot water and steam are always main exploitation modes of heavy oil reservoir thermal recovery. The thick oil can absorb heat after being mixed with hot fluid such as steam, 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 extracted from the stratum. After long term heat injection (steam, hot water, etc.) development, many hypertonic macropores are formed in the formation. Most of injected steam breaks through the hypertonic pore canal in the production well too early, so that the injected heat directly flows out of the steam channeling well, and the oil layer cannot be fully heated to displace crude oil, so that the steam flooding has low thermal efficiency and small swept volume, and the normal exploitation of the production well and the blocks is affected. In addition, along with the increase of the liquid discharge amount of the steam channeling well, the temperature difference between the injection well and the production well becomes large, sand production of the oil well is caused, side bottom water can be caused to rush in when serious, equipment such as a pipe column and the like can be damaged besides influencing normal production, and huge economic loss is caused.
In order to solve the problem of steam channeling in the process of exploiting thick oil by injecting steam, the channels with the steam channeling in the reservoir are required to be effectively plugged, so that the seepage resistance in the high-permeability channels is increased, steam flows along the unswept low-permeability channels in the oil reservoir, thick oil in the unswept areas is swept, and the recovery ratio of thick oil steam exploitation is improved. At present, the main methods for blocking steam channeling comprise two methods of mechanical blocking and chemical blocking. Mechanical plugging refers to plugging a steam channeling part through a downhole tool, a packer and the like, but has the defects of high operation difficulty and unsatisfactory plugging effect. In order to reduce construction difficulty, realize deep plugging, reduce operation cost, at present, a chemical plugging process is often adopted in the field, namely chemical plugging agents are injected into a production layer through a production well, the chemical agents can preferentially enter a steam channeling channel with high permeability and small seepage resistance, the steam channeling channel is plugged through the actions of plugging, urgency, adsorption and the like in a rock pore and a throat, the seepage resistance in the steam channeling channel is increased, the steam channeling along a high-permeability layer is effectively prevented, the steam can enter a low-permeability part which is not affected before, an unbroken heavy oil reservoir is developed, and the heavy oil recovery rate is improved by improving the sweep efficiency.
The deep profile control technology mainly adjusts the contradiction between the longitudinal direction and the transverse direction of the deep part of a reservoir layer by using a chemical profile control agent to seal the deep part, and can enable injection fluid to flow from a high-suction-capacity high-permeability layer to a low-suction-capacity medium-low-permeability layer in the deep part of a stratum, so that the sweep coefficient of the deep injection fluid is enlarged, and unswept residual oil formed by the physical property difference of the deep stratum is displaced. Generally, the radius of action of deep profile control technology is more than 2 times that of common profile control technology. The temperature of the thick oil thermal recovery process is higher, so that the high-temperature resistance requirement on the chemical plugging agent after plugging is high, and the gel forming time of the chemical plugging agent needs to be prolonged in order to realize deep profile control. The application publication number CN102504777A discloses a deep profile control agent for delaying crosslinking polymer strong gel and a preparation method thereof, wherein the profile control agent comprises the following raw materials: 0.3 to 0.6 percent of anionic polyacrylamide, 0.1 to 0.3 percent of sodium dichromate, 0.15 to 0.25 percent of sodium sulfite, 0.02 to 0.1 percent of sodium salicylate and the balance of water; wherein the molecular weight of the anionic polyacrylamide is 400 to 1000 ten thousand, and the degree of hydrolysis is 25 to 30 percent. The application publication number CN102071003A discloses a high-temperature-resistant delayed crosslinking polymer deep profile control agent, which comprises anionic partially hydrolyzed polyacrylamide, phenol, urotropine and thiourea in a formula in a weight ratio: the anionic partially hydrolyzed polyacrylamide (molecular weight 1600-2500 ten thousand, hydrolysis degree 25-30%) is 0.2% to 0.03% to 0.15% to 0.005-0.02% of phenol, urotropine and thiourea, and the balance is fresh water. In addition to organic polymers, inorganic gels are also used as profile control agents. The application publication number 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 urotropine 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 progress" in 2017, volume 18, 6 release paper "development of inorganic gel deep profile control agent WJ-2 for low-permeability oil reservoirs" prepares a temperature-resistant and salt-resistant inorganic aluminum gel deep profile control agent by adopting polyaluminium chloride, urea as an activating agent and the like, and the formula of a gel system is as follows: 8% of polyaluminum chloride, 4% of urea and 0.5% 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 achieved by chelating metal salt and delaying the crosslinking time of the metal salt and polyacrylamide. Because 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 gel forming capability of the polyacrylamide is reduced, and the deep part gel forming is not beneficial to sealing the high-permeability stratum. Meanwhile, the stratum contains clay and the like, and the molecular structure characteristics of the polyacrylamide and the cross-linking agent are easy to be adsorbed on the clay surface 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 gel formation is not easy to plug the high-permeability stratum. Under the high-salt environment condition of partial formation water, polyacrylamide is difficult to chemically crosslink with a crosslinking agent to form gel, and the high-permeability layer is difficult to be plugged in the deep part. Meanwhile, the temperature resistance of the polyacrylamide gel is poor, and under the condition that the injection fluid adopted by the thickened oil heat is steam or hot water, the polyacrylamide gel is easy to break gel and lose the blocking performance, so that the application of the polyacrylamide gel in the thickened oil heat recovery field is limited.
The inorganic gel is generated by utilizing inorganic polymers composed of polyaluminium chloride or polymeric ferric sulfate or polymeric aluminum ferric chloride to react under alkaline conditions, so that the plugging profile control of the stratum can be realized, and the inorganic gel has better temperature resistance than polyacrylamide gel and has constant and good application in the field of thickened oil thermal recovery. The aqueous solution prepared from the inorganic polymer has low viscosity and is easy to pump before gel formation, is not affected by shear damage and high salt content of formation water, and can be used in large dose at low price. In order to delay the inorganic polymer from generating gel under the alkaline condition, urea or urotropine is adopted to form alkaline in aqueous solution under the formation temperature condition as an exciting agent, so that the aim of profile control is fulfilled, but from the current research and field application, the urea or urotropine is slower in decomposition speed at normal temperature, but the urea or urotropine is faster in decomposition speed under the formation temperature condition after entering the formation and forms an alkaline environment rapidly, so that the gel forming time of a mixed solution formed by the inorganic polymer such as polyaluminum chloride or polyaluminum ferric sulfate or polyaluminum ferric chloride and urea or urotropine is still faster than the field engineering requirement, and the method is only suitable for profile control of near well zones, and how to further reduce the decomposition speed of the exciting agent such as urea or urotropine under the formation temperature condition, so that the formation time delay of the alkaline environment is one of key technologies for realizing deep profile control of the inorganic polymer gel.
Disclosure of Invention
The application provides a fluid of deep profile control inorganic particle gel, a preparation method and application thereof.
The technical scheme adopted by the application is as follows:
a fluid capable of deep profile control of inorganic particle gel comprises an inorganic polymeric gel main agent, a capsule-coated excitation system and water.
Wherein, the inorganic polymeric binder is an inorganic polymer, and comprises one or a mixture of polyaluminum chloride, polymeric ferric sulfate or polymeric aluminum ferric chloride with the content of 1-30 percent (by weight) so as to realize the total weight of the deep profile control inorganic particle gel fluid.
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 wrappers formed by capsule walls, and the content of the capsule excitation system is 0.5-15% (weight) so as to realize the total weight of the deep profile control inorganic particle gel fluid.
Preferably, the encapsulated activation system is present in an amount of 2% to 10% by weight.
Wherein the capsule core particles comprise 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 percent (weight), the auxiliary material comprises microcrystalline cellulose, hydroxypropyl methyl cellulose and tween 80, wherein the microcrystalline cellulose content is 5-50 percent (weight), the hydroxypropyl methyl cellulose content is 0.2-5 percent (weight), the tween 80 content is 0.2-5 percent, and the deionized water content is the total weight of the materials required in the preparation process of the capsule core particles except the residual amount of the main material and the auxiliary material;
the capsule wrapping material 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 percent), the solvent consists of a mixed solution of absolute ethanol and toluene, the content of the absolute ethanol is 50-90 percent (weight percent), and the content of the toluene is 5-30 percent (weight percent), based on the total weight of materials required in the preparation process of the capsule wall materials
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, stratum water or sea water, and the content is the residual amount of the inorganic polymeric binder main agent and the capsule-coated excitation system, so as to realize the total weight of the deep profile control inorganic particle gel fluid.
A preparation method of fluid of deep profile control inorganic particle gel comprises a preparation method of a capsule-encapsulated excitation system and a preparation method of inorganic particle gel fluid;
the preparation method of the encapsulated excitation system comprises the steps of preparing capsule core particles, preparing capsule wall materials and encapsulating:
step one: preparing capsule core particles: adding tween 80 into deionized water to form tween 80 water solution, adding microcrystalline cellulose and hydroxypropyl methylcellulose into tween 80 water solution under stirring to dissolve or disperse the two components in tween 80 water solution, and continuously adding urea or urotropine or mixture thereof, and stirring; preparing capsule core particles by adopting an extrusion spheronization granulation method, namely: 1) Extrusion molding: putting the prepared wet materials into an extrusion bin, selecting a sieving plate with a sieve pore diameter of 0.5 mm at a discharge hole, starting an extrusion mode, and opening cooling water circulation to reduce the temperature; the obtained strip is not only an unshaped capsule core; 2) Shaping into a group: pouring the unshaped capsule core material into a rounding machine, passing through a discharge hole and a feed hole, starting a rounding mode, adjusting the rotation speed of the rounding machine to 700-1100 revolutions per minute, and checking the rounding degree of the capsule core until no bonding phenomenon occurs in the capsule core material; to be formed intoIs put back into the roller again, the drying mode is selected, and the temperature and the air inlet speed are not higher than 120 ℃ and 1m 3 /h-5m 3 Drying is carried out between/h, 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 a stirring condition, placing the mixed solution in a constant-temperature water bath kettle at 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 first step into a rounding machine, starting a coating mode, and pouring the capsule wall material obtained in the second step into a spraying groove; then the material control temperature is set at 20-35 ℃, the air inlet temperature is set at 40-50 ℃, and whether the capsule core particles are uniformly wrapped is observed after the use of the capsule wall material is finished; after the microcapsule is prepared, a drying mode is started, the temperature is set to be 30-40 ℃, and the drying mode takes the surface drying of the microcapsule as a standard; screening the capsules by adopting a screen with the size of 40-60 meshes to remove the microcapsules with the coating being too thick, thus obtaining a capsule-coating excitation system;
the preparation method of the inorganic particle gel fluid comprises the steps of dissolving an inorganic polymerization gel main agent in water under the stirring condition, adding the coated 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 and dispersing at a low speed uniformly to form the inorganic particle gel fluid for realizing deep profile control.
The fluid is delivered to underground stratum according to routine profile control construction procedure, and after reaching the stratum deep part under the action of displacing liquid, inorganic particle gel forms gel slowly under stratum temperature condition, after inorganic particle gel forms gel, petroleum is extracted from stratum according to routine profile control construction procedure.
The application has the following advantages:
the fluid of the deep profile control inorganic particle gel comprises an inorganic polymeric gel main agent, a capsule-coated excitation system and water. The inorganic polymeric binder main agent comprises polyaluminum chloride or polyferric sulfate or one or more mixtures of polyaluminum ferric chloride, and the inorganic gel generated by the reaction of the inorganic polymer under alkaline conditions can realize the plugging profile control of the stratum, but the reaction is faster and difficult to control under alkaline environment conditions. In order to realize the gel formation of inorganic polymerization in the stratum, urea or urotropine is decomposed to form alkaline aqueous solution under the condition of the stratum temperature to promote the inorganic polymer to generate inorganic gel, but the method is only suitable for plugging near well areas. In order to further delay the gel forming time of the inorganic particle gel to realize deep profile control, the decomposition speed of urea or urotropine under the formation temperature condition needs to be prolonged, if the urea or urotropine is wrapped by a capsule, the release time of the urea or urotropine in water is prolonged by utilizing the slow release performance of the microcapsule, so that the gel forming time of the inorganic particle gel is delayed, the fluid has enough time to reach the deep part of the formation, and the deep profile control of the inorganic particle gel in the formation is realized.
Detailed Description
The application will be further described with reference to specific examples. However, the present application 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 Co., ltd
Urotropin: chengdu Kelong chemical Co., ltd
Microcrystalline cellulose: chengdu Kelong chemical Co., ltd
Hydroxypropyl methylcellulose: chengdu Kelong chemical Co., ltd
Tween 80: chengdu Kelong chemical Co., ltd
Ethyl cellulose: chengdu Kelong chemical Co., ltd
Ethanol: chengdu Kelong chemical Co., ltd
Toluene: chengdu Kelong chemical Co., ltd
Deionized water: self-made laboratory
Tap water
Test performance and test method:
and (3) placing the fluid subjected to deep profile control of the oil reservoir into a container with a certain temperature by adopting a test tube inversion method, taking out the fluid periodically for observation, and observing the condition that the gel loses fluidity by 45 degrees between the test tube and the vertical direction, namely the gel forming time of the inorganic particle gel.
Plugging performance test: and (3) filling the sand filling pipe with 40-70 meshes of quartz sand to form a porous medium, testing the permeability change of hot water and steam before and after the inorganic gel forming plugging by adopting a single-pipe displacement experimental device, and calculating the hot water plugging rate and the steam plugging rate of inorganic particle gel plugging agents under different conditions according to the permeability change, wherein the plugging effect is better when the plugging rate is higher, so that the profile control of the hot water and the steam of the thickened oil thermal recovery is facilitated.
Wherein: e (E) w The hot water plugging rate,%; k (K) w0 To measure permeability in initial Hot Water, μm 2 ；K w1 To determine permeability in hot water after gelation, μm 2 。
Wherein: e (E) g Steam blocking rate,%; k (K) g0 To measure permeability in initial Hot Water, μm 2 ；K g1 To determine permeability in hot water after gelation, μm 2 。
Example 1 reservoir deep profile control fluid comprises an inorganic polymeric binder matrix and a encapsulated capsule excitation system, wherein the preparation method of the encapsulated capsule excitation system comprises the steps of capsule core particle preparation and capsule wall material preparation and an encapsulation process:
step one, preparing capsule core particles: adding tween 80 into deionized water to form tween 80 water solution, adding microcrystalline cellulose and hydroxypropyl methylcellulose into tween 80 water solution under stirring to dissolve or disperse the two components in tween 80 water solution, and continuously adding urea or urotropine or mixture thereof, and stirring. Preparing capsule core particles by adopting an extrusion spheronization granulation method, namely: 1) Extrusion molding: the prepared wet materials are put into an extrusion bin, a sieving plate with the sieve aperture of a discharge hole of 0.5 mm is selected, an extrusion mode is started, and cooling water circulation is started to reduce the temperature. The obtained strip is not only an unshaped capsule core; 2) Shaping into a group: pouring the unshaped capsule core material into a rounding machine, passing through a discharge hole and a feed hole, starting a rounding mode, adjusting the rotation speed of the rounding machine to 700-1100 revolutions per minute, and checking the rounding degree of the capsule core at proper time until the bonding phenomenon does not occur in the capsule core material basically. The formed capsule core is put back into the roller again, the drying mode is selected, and the temperature and the air inlet speed are not higher than 120 ℃ and 1m 3 /h to 5m 3 And/h, drying to enable the capsule core to be in a dry state.
Preparing a capsule wall material: mixing anhydrous ethanol and toluene according to a preset 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, a wrapping process: and (3) placing the capsule core after rounding into a rounding machine, starting a coating mode, and pouring coating liquid into a spray tank. And then the material control temperature is set at 20-35 ℃, the air inlet temperature is set at 40-50 ℃, and whether the capsule core is uniformly wrapped is observed after the coating liquid is used. After the microcapsule is prepared, a drying mode is started, the temperature is set to be 30-40 ℃, and the drying mode is based on the surface drying of the microcapsule. And screening the capsules by adopting a screen with the size of 40 to 60 meshes to remove the microcapsules with the coating being too thick, thus obtaining the encapsulated capsule excitation system.
Encapsulation capsule excitation system I:
the capsule core particle comprises the following components: the urea content was 50 wt%, the microcrystalline cellulose content was 10 wt%, the hydroxypropyl methylcellulose 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 the materials required during the preparation of the core particle.
The components of the capsule wall material are as follows: the ethylcellulose content was 10 wt.%, the ethanol content was 75 wt.%, and the toluene content was 15 wt.%. Based on the total weight of the material required during the preparation of the wall material.
And (3) preparing the mixture ratio in the encapsulation capsule excitation system I according to the operation method of the S1 capsule core particle preparation, the S2 capsule wall material preparation and the S3 encapsulation process to obtain the encapsulation capsule excitation system I.
Encapsulation capsule excitation system II:
the capsule core particle comprises the following components: the urea content was 60 wt%, the microcrystalline cellulose content was 15 wt%, the hydroxypropyl methylcellulose 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 the materials required during the preparation of the core particle.
The components of the capsule wall material are as follows: the ethylcellulose content was 12 wt.%, the ethanol content was 73 wt.%, and the toluene content was 15 wt.%. Based on the total weight of the material required during the preparation of the wall material.
And (3) preparing the mixture ratio in the encapsulation capsule excitation system II according to the operation method of the S1 capsule core particle preparation, the S2 capsule wall material preparation and the S3 encapsulation process to obtain the encapsulation capsule excitation system II.
Encapsulation capsule excitation system III:
the capsule core particle comprises the following components: the urotropine content was 65 wt%, the microcrystalline cellulose content was 10 wt%, the hydroxypropyl methylcellulose content was 2.0 wt%, the tween 80 content was 2.0 wt%, and the deionized water content was 21 wt%. Based on the total weight of the materials required during the preparation of the core particle.
The components of the capsule wall material are as follows: the ethylcellulose content was 15 wt.%, the ethanol content was 70 wt.%, and the toluene content was 15 wt.%. Based on the total weight of the material required during the preparation of the wall material.
And (3) preparing the mixture ratio in the encapsulation capsule excitation system III according to the operation method of the S1 capsule core particle preparation, the S2 capsule wall material preparation and the S3 encapsulation process to obtain the encapsulation capsule excitation system III.
Encapsulation capsule excitation system IV:
the capsule core particle comprises the following components: the urotropine content is 20 wt%, urea content is 25 wt%, microcrystalline cellulose content is 10 wt%, hydroxypropyl methylcellulose content is 1.5 wt%, tween 80 content is 1.5 wt%, and deionized water content is 21 wt%. Based on the total weight of the materials required during the preparation of the core particle.
The components of the capsule wall material are as follows: the ethylcellulose content was 15 wt.%, the ethanol content was 70 wt.%, and the toluene content was 15 wt.%. Based on the total weight of the material required during the preparation of the wall material.
And (3) preparing the encapsulated capsule excitation system IV according to the proportion in the encapsulated capsule excitation system IV according to the operation method of the S1 capsule core particle preparation, the S2 capsule wall material preparation and the S3 encapsulation process.
Example 2: under the stirring condition, 10g of polyaluminium chloride is dissolved in 83g of tap water, 7g of encapsulated capsule excitation system I is added after the polyaluminium chloride is uniformly stirred, and the mixture is uniformly stirred and dispersed at a low speed, so that the oil reservoir deep profile control fluid is formed. For comparison of the effect of the delayed inorganic particle gel, the same amount of urea in the encapsulated excitation system I was used as an activator for comparison. The encapsulation capsule excitation system I is used as an exciting agent, the gel forming time of inorganic aluminum polymer particle gel under the high temperature condition can be prolonged, and the plugging effect on hot water and steam in a porous medium is better close to the plugging effect of profile control fluid with the same content of urea as the exciting agent.
Gel forming time contrast and plugging performance at different temperatures
Example 3: and (3) under the stirring condition, 15g of polymeric ferric sulfate is dissolved in 75g of tap water, after the polymeric aluminum is uniformly stirred, 10g of a coated capsule excitation system II is added, and the mixture is uniformly stirred and dispersed at a low speed, so that the thick oil thermal recovery steam or the hot water flooding deep profile control inorganic particle gel fluid is formed. For the comparison of the effect of the delayed inorganic particle gel, the profile control fluid, which takes urea with the same content as the activator in the capsule excitation system II, is used for comparison. The encapsulation capsule excitation system II is used as an exciting agent, the gel forming time of inorganic aluminum polymer particle gel under the high temperature condition can be prolonged, and the plugging effect on hot water and steam in a porous medium is better close to the plugging effect of profile control fluid with the same content of urea as the exciting agent.
Gel forming time contrast and plugging performance at different temperatures
Example 4: under the stirring condition, 8g of polyaluminum ferric chloride is dissolved in 75g of tap water, 5g of a coated capsule excitation system III is added after the polyaluminum is uniformly stirred, and the mixture is uniformly stirred and dispersed at a low speed, so that thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid is formed. In order to compare the effect of the delayed inorganic particle gel, the profile control fluid which takes urotropine with the same content in the capsule excitation system III as an exciting agent is used for comparison. The encapsulation capsule excitation system III is used as an exciting agent, the gel forming time of inorganic polymer aluminum particle gel under the high temperature condition can be prolonged, and the plugging effect on hot water and steam in a porous medium is better close to the plugging effect of profile control fluid with the same content of urotropine as the exciting agent.
Gel forming time contrast and plugging performance at different temperatures
Example 5: under the stirring condition, 10g of polyaluminium chloride is dissolved in 82g of tap water, after the polyaluminium chloride is uniformly stirred, 8g of a capsule excitation system IV is added, and after the mixture is uniformly stirred and dispersed at a low speed, thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid is formed. For the purpose of comparing the effect of the delayed inorganic particle gel, the profile control fluid which takes the urea and urotropine mixture with the same content in the capsule excitation system IV as the excitation agent is used for comparison. The encapsulation capsule excitation system IV is used as an exciting agent, the gel forming time of inorganic polymer aluminum particle gel under the high temperature condition can be prolonged, and the plugging effect on hot water and steam in a porous medium is better close to that of a profile control fluid with the same content of urea and urotropine mixture as the exciting agent.
Gel forming time contrast and plugging performance at different temperatures
Example 6: under the stirring condition, 12g of polyaluminum ferric chloride is dissolved in 75g of tap water, after the polyaluminum is uniformly stirred, 8g of a capsule excitation system II is added, and after the mixture is uniformly stirred and dispersed at a low speed, thick oil thermal recovery steam or hot water flooding deep profile control inorganic particle gel fluid is formed. For the comparison of the effect of the delayed inorganic particle gel, the profile control fluid, which takes urea with the same content as the activator in the capsule excitation system II, is used for comparison. The encapsulation capsule excitation system II is used as an exciting agent, the gel forming time of inorganic aluminum polymer particle gel under the high temperature condition can be prolonged, and the plugging effect on hot water and steam in a porous medium is better close to the plugging effect of profile control fluid with the same content of urea as the exciting agent.
Gel forming time contrast and plugging performance at different temperatures
It is pointed out that several variations and modifications can be made by a person skilled in the art without departing from the inventive concept, which fall within the scope of the application.
Claims (7)
1. A fluid of deep profile control inorganic particle gel, which is characterized in that: comprises inorganic polymeric gum as main agent, capsule excitation system and water;
the inorganic polymeric binder is prepared from inorganic polymer, wherein the inorganic polymeric binder comprises one or more of polyaluminum chloride, polymeric ferric sulfate or polymeric aluminum ferric chloride, and the content of the inorganic polymeric binder is 1-30 wt%, based on the total weight of the deep profile control inorganic particle gel fluid;
the capsule excitation system comprises capsule core particles and capsule wrappers formed by capsule walls, wherein the content of the capsule excitation system is 0.5-15% (weight) so as to realize the total weight of the deep profile control inorganic particle gel fluid;
the capsule core particle comprises a main material, an auxiliary material and deionized water, wherein the main material comprises one or a mixture of urea or urotropine, the content is 10-90 percent (weight), the auxiliary material comprises microcrystalline cellulose, hydroxypropyl methyl cellulose and tween 80, the microcrystalline cellulose content is 5-50 percent (weight), the hydroxypropyl methyl cellulose content is 0.2-5 percent (weight), the tween 80 content is 0.2-5 percent, and the deionized water content is the total weight of materials required in the preparation process of the capsule core particle, wherein the residual amounts of the main material and the auxiliary material are removed;
the capsule wrapping formed by the capsule wall comprises a main material and a solvent, wherein the main material adopts ethyl cellulose, the content of the ethyl cellulose is 2-20 percent (weight), the solvent consists of a mixed solution of absolute ethanol and toluene, the content of the absolute ethanol is 50-90 percent (weight), and the content of the toluene is 5-30 percent (weight), based on the total weight of the materials required in the preparation process of the capsule wall material.
2. The deep-profile-adjustable inorganic particle gel fluid of claim 1, wherein: the content of the inorganic polymeric synthetic gum main agent is 5-20% (weight).
3. The deep-profile-adjustable inorganic particle gel fluid of claim 1, wherein: the content of the excitation system of the encapsulation capsule is 2-10% (weight).
4. The deep-profile-adjustable inorganic particle gel fluid of claim 1, wherein: the urea or urotropine is 20-70 wt%, microcrystalline cellulose is 10-40 wt%, hydroxypropyl methylcellulose is 0.5-3 wt%, and Tween 80 is 0.5-3 wt%;
the content of the ethyl cellulose is 5-15 percent (weight), the content of the absolute ethyl alcohol is 60-85 percent (weight), and the content of the toluene is 10-20 percent (weight).
5. The deep-profile-adjustable inorganic particle gel fluid of claim 1, wherein: the water comprises tap water, stratum water or seawater, and the content is the residual amount of the inorganic polymeric binder main agent and the capsule-wrapping excitation system, so that the total weight of the deep profile control inorganic particle gel fluid is realized.
6. A method for preparing a fluid of the deep profile control inorganic particle gel of claim 1, wherein the method comprises the steps of: comprises a preparation method of a capsule-encapsulated excitation system and a preparation method of inorganic particle gel fluid;
the preparation method of the encapsulated excitation system comprises the steps of preparing capsule core particles, preparing capsule wall materials and encapsulating:
step one: preparing capsule core particles: adding Tween 80 into deionized water to form Tween 80 water solution, adding microcrystalline cellulose and hydroxypropyl methylcellulose into Tween 80 water solution under stirring to dissolve or disperse the two components in Tween 8080 water solution, continuously adding one or a mixture of urea and urotropine, and uniformly stirring; preparing capsule core particles by adopting an extrusion spheronization granulation method, namely: 1) Extrusion molding: putting the prepared wet materials into an extrusion bin, selecting a sieving plate with a sieve pore diameter of 0.5 mm at a discharge hole, starting an extrusion mode, and opening cooling water circulation to reduce the temperature; the obtained strip is not only an unshaped capsule core; 2) Shaping into a group: pouring the unshaped capsule core material into a rounding machine, passing through a discharge hole and a feed hole, starting a rounding mode, adjusting the rotation speed of the rounding machine to 700-1100 revolutions per minute, and checking the rounding degree of the capsule core until no bonding phenomenon occurs in the capsule core material; the formed capsule core is put back into the roller again, the drying mode is selected, and the temperature and the air inlet speed are not higher than 120 ℃ and 1m 3 /h-5m 3 Drying is carried out between/h, 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 a stirring condition, placing the mixed solution in a constant-temperature water bath kettle at 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 first step into a rounding machine, starting a coating mode, and pouring the capsule wall material obtained in the second step into a spraying groove; then the material control temperature is set at 20-35 ℃, the air inlet temperature is set at 40-50 ℃, and whether the capsule core particles are uniformly wrapped is observed after the use of the capsule wall material is finished; after the microcapsule is prepared, a drying mode is started, the temperature is set to be 30-40 ℃, and the drying mode takes the surface drying of the microcapsule as a standard; screening the capsules by adopting a screen with the size of 40-60 meshes to remove the microcapsules with the coating being too thick, thus obtaining a capsule-coating excitation system;
the preparation method of the inorganic particle gel fluid comprises the steps of dissolving an inorganic polymerization gel main agent in water under the stirring condition, adding the coated 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 and dispersing at a low speed uniformly to form the inorganic particle gel fluid for realizing deep profile control.
7. Use of the fluid of deep-profile-adjustable inorganic particulate gel of claim 1, wherein: and (3) delivering the fluid to the underground stratum according to a conventional profile control construction procedure, slowly gelling inorganic particle gel under the stratum temperature condition after the fluid reaches the deep part of the stratum under the action of displacement fluid, and extracting petroleum from the stratum according to the procedure after conventional profile control construction after gelling the inorganic particle gel.
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