CN114645690B - Compound profile control and flooding process for gel dispersion - Google Patents
Compound profile control and flooding process for gel dispersion Download PDFInfo
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- CN114645690B CN114645690B CN202011517455.2A CN202011517455A CN114645690B CN 114645690 B CN114645690 B CN 114645690B CN 202011517455 A CN202011517455 A CN 202011517455A CN 114645690 B CN114645690 B CN 114645690B
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- 239000006185 dispersion Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 22
- 150000001875 compounds Chemical class 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims abstract description 14
- 239000000499 gel Substances 0.000 claims abstract description 67
- 239000007924 injection Substances 0.000 claims abstract description 53
- 238000002347 injection Methods 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 235000015110 jellies Nutrition 0.000 claims abstract description 36
- 239000008274 jelly Substances 0.000 claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 239000004094 surface-active agent Substances 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims abstract description 10
- 238000010008 shearing Methods 0.000 claims description 37
- 229920001002 functional polymer Polymers 0.000 claims description 25
- 239000003431 cross linking reagent Substances 0.000 claims description 24
- 229920000642 polymer Polymers 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000012744 reinforcing agent Substances 0.000 claims description 12
- 125000004122 cyclic group Chemical group 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 229940064958 chromium citrate Drugs 0.000 claims description 8
- SWXXYWDHQDTFSU-UHFFFAOYSA-K chromium(3+);2-hydroxypropane-1,2,3-tricarboxylate Chemical compound [Cr+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O SWXXYWDHQDTFSU-UHFFFAOYSA-K 0.000 claims description 8
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 7
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- XFJRTXJMYXFAEE-UHFFFAOYSA-K [Cr+3].CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O Chemical compound [Cr+3].CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O XFJRTXJMYXFAEE-UHFFFAOYSA-K 0.000 claims description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 4
- PYXSPTLIBJZHQW-UHFFFAOYSA-K chromium(3+);propanoate Chemical compound [Cr+3].CCC([O-])=O.CCC([O-])=O.CCC([O-])=O PYXSPTLIBJZHQW-UHFFFAOYSA-K 0.000 claims description 4
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims description 4
- 229940015043 glyoxal Drugs 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims description 4
- 150000003754 zirconium Chemical class 0.000 claims description 4
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 150000008052 alkyl sulfonates Chemical class 0.000 claims description 3
- 150000007942 carboxylates Chemical class 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 2
- -1 alkylbenzene sulfonate Chemical class 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 28
- 239000003795 chemical substances by application Substances 0.000 abstract description 12
- 238000011084 recovery Methods 0.000 abstract description 8
- 230000005465 channeling Effects 0.000 abstract description 6
- 239000010779 crude oil Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 12
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
- 241000237858 Gastropoda Species 0.000 description 1
- 229940123973 Oxygen scavenger Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Colloid Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention relates to a jelly dispersion compound profile control and flooding process, and belongs to the technical field of oil layer profile control and flooding. The process comprises the following steps: sequentially injecting a front slug, a main body slug, a first protection slug, a second protection slug and a displacement slug into the stratum; wherein, the front slug, the main body slug and the first protection slug are all jelly dispersoids and surfactants, and the second protection slug is a functional jelly dispersoids, a stabilizer and an deoxidizer; the displacement slug adopts a functional jelly dispersion. According to the invention, a compound oil displacement system of the gel dispersion and the surfactant is used as a plugging agent, and the gel dispersion and the surfactant are injected into the compound oil displacement system of the front slug, so that the water injection displacement profile is adjusted, the water channeling of a water injection dominant channel is inhibited, the water flooding wave and volume of an underdeveloped reservoir are improved, and the water injection efficiency and the crude oil recovery rate are improved.
Description
Technical Field
The invention belongs to the technical field of oil layer profile control and displacement, and particularly relates to a jelly dispersion compound profile control and displacement process.
Background
The reservoir of the land-phase sedimentary oilfield has large permeability difference and strong heterogeneity. With the deep development of oil fields, the water content of the water drive increases rapidly, and the water drive efficiency is low. In the later stage of water flooding, 60% -70% of original petroleum is still stored in an oil layer, so how to improve the recovery ratio of residual oil becomes the key of the yield increase and the stable yield of the high-water-content oil field.
Reservoir heterogeneity is one of the main factors affecting efficient development of high temperature high salt reservoirs, so to improve the later water flooding effects in high temperature high salt reservoirs requires first to regulate the heterogeneity of the formation. However, the high-temperature and high-salt oil reservoirs are deep in burial, high in temperature and high in formation water mineralization, and these complex conditions become technical difficulties in improving the heterogeneity of reservoirs. At present, water injection development is a main mode of oil reservoir development, but most oil reservoirs are not ideal in water flooding effect, for example, the problems of uneven water injection, easy channeling of large pore canals and uneven oil well efficiency exist. Particularly, for a river sand oil reservoir, because the central hypertonic edge of the river sand oil reservoir is hypotonic, the problems of easy water injection channeling and low water injection efficiency exist, and the oil reservoir recovery ratio is seriously influenced.
Chinese patent application 201610506743.5 discloses a reinforced jelly dispersion deep profile control agent suitable for low-permeability high-temperature high-salt reservoirs. The enhanced jelly dispersion deep profile control agent suitable for the low-permeability high-temperature high-salt oil reservoir consists of a functional polymer, a cross-linking agent, an inorganic reinforcing agent and water according to the following mass fraction: the mass concentration of the functional polymer is 0.4-0.6%; the mass concentration of the cross-linking agent is 0.4-0.8%; inorganic reinforcing agent with mass concentration of 0.2-0.3%; the balance being water. The average particle size of the enhanced jelly dispersion deep profile control agent is distributed from nano level to micro level, can be used for deep profile control of low-permeability oil reservoirs, has good deep migration capacity and good profile improvement effect, and has remarkable recovery ratio improvement effect; the deep profile control agent can be used for deep profile control operation of high-temperature and high-salt oil reservoirs.
Chinese patent application 201811229916.9 discloses a profile control agent which is obtained by reacting raw materials comprising a salt-tolerant polymer, a cross-linking agent, a stabilizer and water. Also provides a preparation method thereof, which comprises the following steps: 1) Adding a salt-resistant polymer into water to fully dissolve the salt-resistant polymer, then adding a cross-linking agent, adding a stabilizing agent, and reacting for 6 to 8 hours at the temperature of between 90 and 110 ℃ to obtain jelly; 2) Granulating the jelly to obtain the profile control and flooding agent granule dispersion liquid.
Chinese patent application 201810029664.9 discloses a method for improving the water flooding effect of an oil reservoir by a multi-scale gel dispersion system, which comprises the following steps: step 1, selecting a well; step 2, determining the dosage of the profile control agent: acquiring relevant parameters of the profile control agent and the oil layer, and calculating to obtain the dosage of the profile control agent; step 3, designing a slug combination: the method mainly comprises the steps of setting a gel dispersion main body slug to perform deep profile control and flooding on an advantageous channel, supplementing a rear weak gel slug to protect according to the injection pressure condition, and then performing displacement to enable a profile control and flooding agent to enter a required position. The invention can realize the consistent water breakthrough time of the production wells in different directions, thereby expanding the water injection scope of the oil reservoir, improving the utilization rate of injected water and improving the development effect of the oil reservoir.
The following problems still exist in the current water injection and oil displacement process of the river sand oil reservoir: (1) Dynamic parameter adjusting effects such as pulse water injection, periodic water injection and the like are limited; (2) The early microspheres and the surfactant have low pertinence and unsatisfactory profile control effect; (3) The oil-increasing capability of a single gel dispersion profile control or a single surfactant oil-displacing technology is limited.
Aiming at the technical problems, the application provides a gel dispersion compound profile control and displacement process, which is used for adjusting a water injection displacement profile, inhibiting water channeling of a water injection dominant channel, improving the water drive wave and volume of an underdeveloped reservoir, and achieving the purposes of improving water injection efficiency and increasing crude oil recovery ratio.
Disclosure of Invention
The invention aims to provide a gel dispersion compound flooding technology, which adopts a compound flooding system of a gel dispersion and a surfactant as a plugging agent, and injects the gel dispersion and the surfactant into a compound flooding system of a front slug, so as to adjust the flooding section, inhibit the water channeling of a flooding dominant channel, improve the water flooding wave and volume of an underdeveloped reservoir, and achieve the purposes of improving the flooding efficiency and increasing the crude oil recovery ratio.
In order to achieve the above object, the present invention has the following technical scheme:
a gel dispersion compound profile control and flooding process comprises the following steps: and sequentially injecting a front slug, a main body slug, a first protection slug, a second protection slug and a displacement slug into the stratum.
Wherein, the front slug, the main body slug and the first protection slug are all jelly dispersoids and surfactants, and the second protection slug is a functional jelly dispersoids, a stabilizer and an deoxidizer; the displacement slug adopts a functional polymer.
Preferably, the gel dispersion comprises a polymer 1 and a cross-linking agent 1, wherein the polymer 1 is polyacrylamide, and the cross-linking agent 1 is at least one selected from formaldehyde, glyoxal, chromium lactate, chromium citrate, chromium propionate, chromium acetate, aluminum salt and zirconium salt; further preferably, the mass ratio of the polymer 1 to the crosslinking agent 1 is 1:3-4.
Specifically, the gel dispersion is prepared according to the following method:
a1, adding a cross-linking agent 1 into the aqueous solution of the polymer 1, and stirring to obtain a system 1;
a2, heating the system 1, and reacting to obtain a gel body 1;
a3, carrying out cyclic shearing treatment on the gel body 1 and water to obtain the gel dispersion.
Wherein,
in step A1, the mass fraction of the aqueous solution of the polymer 1 is 0.2 to 0.5%, preferably 0.3%.
In the step A1, the stirring time is 20-50min.
In the step A2, the heating temperature is 90-100 ℃.
In the step A2, the reaction time is 4-12h.
In the step A3, the mass ratio of the gel body 1 to water is 0.5-2:1, preferably 1:1.
In the step A3, the conditions of the cyclic shearing treatment are specifically as follows:
for the gel dispersion of the pre-slug, the shearing is circularly sheared for 5 to 8 times by adopting a shearing rate of 45 to 60Hz, preferably for 6 times by adopting a shearing rate of 50 Hz;
for the jelly dispersion of the main body slug, circularly shearing for 3-5 times by adopting a shearing rate of 35-45Hz, and circularly shearing for 4 times by adopting a shearing rate of 40 Hz;
for the jelly dispersion of the first guard plug, 1-2 cycles of shear are performed using a shear rate of 10-20Hz and 1 cycle of shear are performed using a shear rate of 15 Hz.
Preferably, the surfactant is selected from at least one of alkylbenzene sulfonate, alkyl sulfonate, petroleum sulfonate, and petroleum carboxylate.
Preferably, the mass ratio of the gel dispersion to the surfactant is 0.5-1.5:1, and more preferably 1:1.
Preferably, the functional gel dispersion comprises an inorganic reinforcing agent, a functional polymer and a cross-linking agent 2, wherein the inorganic reinforcing agent is at least one of micrometer calcium carbonate, nanometer silicon dioxide, micrometer silicon dioxide and nanometer graphite, the functional polymer is a composite polymer formed by a functional monomer and an acrylamide monomer, and the functional monomer is at least one of 2-acrylamide-2-methylpropanesulfonic acid, sodium p-styrene sulfonate, acrylic acid, N-methylenebisacrylamide and butyl acrylate; the cross-linking agent 2 is at least one selected from formaldehyde, glyoxal, chromium lactate, chromium citrate, chromium propionate, chromium acetate, aluminum salt and zirconium salt; further preferably, the mass ratio of the crosslinking agent to the polymer is 4:1, and the mass ratio of the inorganic reinforcing agent to the functional polymer is 1:3.
Specifically, the functional gel dispersion is prepared according to the following method:
b1, adding a cross-linking agent 2 and an inorganic reinforcing agent into an aqueous solution of a functional polymer, and stirring to obtain a system 2;
b2, heating the system 2, and reacting to obtain a gel body 2;
and B3, performing cyclic shearing treatment on the gel body 2 and water to obtain the functional gel dispersion.
Wherein,
in the step B1, the mass fraction of the aqueous solution of the functional polymer is 0.2-0.5%, preferably 0.3%.
In the step B1, the stirring time is 20-50min.
In the step B2, the heating temperature is 90-100 ℃.
In the step B2, the reaction time is 4-12h.
In the step B3, the mass ratio of the gel body 2 to water is 0.5-2:1, preferably 1:1.
In the step B3, the conditions of the cyclic shearing treatment are specifically as follows:
circularly shearing for 8-10 times by adopting a shearing rate of 70-120 Hz, preferably 8 times by adopting a shearing rate of 90 Hz;
preferably, the stabilizer is at least one selected from thiourea, aluminum sol and sodium thiosulfate.
Preferably, the deoxidizer is at least one selected from sodium sulfite and sodium bisulfite.
Preferably, the mass ratio of the functional gel dispersion to the stabilizer to the deoxidizer is 100:0.2-0.4:0.02-0.05.
Preferably, the total injection amount of the jelly dispersion, the functional jelly dispersion and the functional polymer of the front slug, the main body slug, the first protection slug, the second protection slug and the displacement slug is 30-50% of the large pore volume of the stratum;
wherein the injection amount of the front-end slug jelly dispersoid is 2-5% of the total injection amount, the injection amount of the main body slug jelly dispersoid is 10-20% of the total injection amount, the injection amount of the first protection slug jelly dispersoid is 30-40% of the total injection amount, the injection amount of the second protection slug function jelly dispersoid is 35-45% of the total injection amount, and the injection amount of the displacement slug function polymer is 0.5-2% of the total injection amount.
Preferably, the injection amount of the pre-slug gel dispersion accounts for 4% of the total injection amount, the injection amount of the main body slug gel dispersion accounts for 16% of the total injection amount, the injection amount of the first protection slug gel dispersion accounts for 37% of the total injection amount, the injection amount of the second protection slug functional gel dispersion plug accounts for 42% of the total injection amount, and the injection amount of the displacement slug functional polymer accounts for 1% of the total injection amount.
The beneficial effects of the invention are as follows:
(1) The water channeling of the water injection dominant channel is inhibited through the compound oil displacement system of injecting the gel dispersion and the surfactant into the front slug, the water flooding wave and volume of the underdeveloped reservoir are improved, the water injection efficiency is improved, and the crude oil recovery ratio is increased;
(2) The front-end slug, the main body slug and the first protection slug adopt different shearing speeds and shearing circulation times to obtain a jelly dispersion, so that the granularity of the jelly dispersion injected by the front-end slug is finer, unstable plugs are formed in the stratum, the stratum is not easy to form plugs when the front-end slug is injected, and the injection of the main body slug and the first protection slug is not influenced;
(3) The gel dispersion with stepped granularity is adopted, so that the finally formed stratum is stable in plugging performance and good in water plugging effect, and meanwhile, due to the different granularity of the gel dispersion injected by different slugs, the gel dispersion can be mutually filled in the filling process, and the water plugging effect is improved.
Detailed Description
In order to make the technical means, the creation features, the achievement of the purpose and the effect of the present invention easy to understand, the present invention will be further elucidated with reference to the specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention. In the following examples, unless otherwise specified, the methods of operation used were conventional, and the equipment used was conventional.
In the following examples, the water used for preparing the jelly dispersion and the functional jelly dispersion is clear water, and the content of the water is less than 10g/L.
In the following examples, taking a Y2 well group in a certain northwest region as an example, the oil layer of the well group belongs to sandstone seeping in mesopores, is a water-flooding oil reservoir, has an average effective thickness of 5-10m, has obvious plane heterogeneity, interlayer and in-layer heterogeneity, and has a recovery degree of 15.3%. 226426.2m according to the total volume of pores 3 The macropore volume was estimated to be: 22642.62m 3 The total injection amount is designed to be: 7500m 3 。
Example 1
A gel dispersion compound profile control and flooding process comprises the following steps: and sequentially injecting a front slug, a main slug, a first protection slug, a second protection slug and a displacement slug into the stratum, wherein the total injection amount of each slug gel dispersion, functional gel dispersion or functional polymer is 40% of the volume of a large pore canal of the stratum, and the total injection amount is shown in table 1.
Table 1.
Wherein, leading slug, main part slug and first protection slug are: a gel dispersion with a mass ratio of 1:1 and a surfactant (the surfactant is obtained by mixing alkyl sulfonate, petroleum sulfonate and petroleum carboxylate according to a mass ratio of 1:1:0.5);
the second protection slug is: a functional gel dispersion, a stabilizer (thiourea) and an oxygen scavenger (sodium sulfite) in a mass ratio of (100:0.3:0.04);
the displacement slug adopts a functional polymer (the functional polymer formed by 2-acrylamide-2-methylpropanesulfonic acid, sodium p-styrenesulfonate and acrylamide according to the mass ratio of 2:1:18, and the molecular weight is 200-4500 w).
The gel dispersion is prepared according to the following method:
a1: adding a cross-linking agent (obtained by mixing chromium citrate and formaldehyde, wherein the mass ratio of the chromium citrate to the formaldehyde is 3:1) into a polymer (polyacrylamide, the molecular weight of which is 500-800 w) aqueous solution with the mass fraction of 0.3%, and stirring for 30min, wherein the mass ratio of the cross-linking agent to the polymer is 4:1;
a2: heating the system to 95 ℃, reacting for 8 hours, and aging to form a gel body;
a3: the gel body was subjected to cyclic shearing treatment under shearing conditions shown in table 1 to obtain a gel dispersion.
The functional gel dispersion is prepared according to the following method:
b1: adding a cross-linking agent (obtained by mixing chromium citrate with formaldehyde, wherein the mass ratio of the chromium citrate to the formaldehyde is 3:1) and an inorganic reinforcing agent (nano silicon dioxide, the particle size is 5-100 nanometers) into an aqueous solution of 0.3% of functional polymer (the functional polymer formed by 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate and acrylamide, and the mass ratio of the cross-linking agent to the polymer is 4:1, and the mass ratio of the inorganic reinforcing agent to the functional polymer is 1:3); then stirring for 30min;
b2: heating the system to 95 ℃, reacting for 8 hours, and aging to form a gel body;
b3: the gel body is subjected to cyclic shearing treatment, and the shearing conditions are shown in table 2, so that the functional gel dispersion is obtained.
Table 2.
Detection of profile control and flooding effect
And adding the gel dispersion in the embodiment into the Y2 well, and counting the oil increasing effects of two wells, namely Y5 and Y9, of the adjacent wells, wherein the accumulated oil increasing amount is compared with that before the flooding of the gel dispersion is implemented.
The detection results are as follows:
table 3.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The compound profile control and flooding process of the gel dispersion is characterized by comprising the following steps of: sequentially injecting a front slug, a main body slug, a first protection slug, a second protection slug and a displacement slug into the stratum;
wherein, the front slug, the main body slug and the first protection slug are all jelly dispersoids and surfactants, and the second protection slug is a functional jelly dispersoids, a stabilizer and an deoxidizer; the displacement slug adopts a functional polymer;
the surfactant is at least one selected from alkylbenzene sulfonate, alkyl sulfonate, petroleum sulfonate and petroleum carboxylate; the gel dispersion comprises a polymer 1 and a cross-linking agent 1, wherein the polymer 1 is polyacrylamide, and the cross-linking agent 1 is at least one selected from formaldehyde, glyoxal, chromium lactate, chromium citrate, chromium propionate, chromium acetate, aluminum salt and zirconium salt; the mass ratio of the polymer 1 to the cross-linking agent 1 is 1:3-4;
the gel dispersion is prepared according to the following steps:
a1, adding a cross-linking agent 1 into the aqueous solution of the polymer 1, and stirring to obtain a system 1;
a2, heating the system 1, and reacting to obtain a gel body 1;
a3, carrying out cyclic shearing treatment on the gel body 1 and water to obtain the gel dispersion;
in the step A3, the mass ratio of the gel body 1 to water is 0.5-2:1, and the conditions of the cyclic shearing treatment are specifically as follows: circularly shearing the gel dispersion of the front slug for 5-8 times by adopting a shearing rate of 45-60 Hz; circularly shearing the jelly dispersion of the main body slug for 3-5 times by adopting a shearing rate of 35-45 Hz; circularly shearing the jelly dispersion of the first protection slug for 1-2 times by adopting a shearing rate of 10-20 Hz;
the stabilizer is at least one selected from thiourea, aluminum sol and sodium thiosulfate; the deoxidizer is at least one of sodium sulfite and sodium bisulfite; the functional gel dispersion comprises an inorganic reinforcing agent, a functional polymer and a cross-linking agent 2, wherein the inorganic reinforcing agent is at least one of micrometer calcium carbonate, nanometer silicon dioxide, micrometer silicon dioxide and nanometer graphite, the functional polymer is a composite polymer formed by a functional monomer and an acrylamide monomer, and the functional monomer is at least one of 2-acrylamide-2 methylpropanesulfonic acid, sodium p-styrenesulfonate, acrylic acid, N-methylenebisacrylamide and butyl acrylate; the cross-linking agent 2 is at least one selected from formaldehyde, glyoxal, chromium lactate, chromium citrate, chromium propionate, chromium acetate, aluminum salt and zirconium salt; the mass ratio of the adding amount of the cross-linking agent to the functional polymer is 4:1, and the mass ratio of the adding amount of the inorganic reinforcing agent to the functional polymer is 1:3;
the functional gel dispersion is prepared according to the following method:
b1, adding a cross-linking agent 2 and an inorganic reinforcing agent into an aqueous solution of a functional polymer, and stirring to obtain a system 2;
b2, heating the system 2, and reacting to obtain a gel body 2;
b3, carrying out cyclic shearing treatment on the gel body 2 and water to obtain the functional gel dispersion;
in the step B1, the mass fraction of the aqueous solution of the functional polymer is 0.2-0.5%, and the stirring time is 20-50min;
in the step B2, the heating temperature is 90-100, and the reaction time is 4-12h;
in the step B3, the mass ratio of the gel body 2 to water is 0.5-2:1, and the conditions of the cyclic shearing treatment are specifically as follows:
circularly shearing for 8-10 times by adopting a shearing rate of 70-120 Hz;
the total injection amount of the jelly dispersion, the functional jelly dispersion and the functional polymer of the front-end section plug, the main body section plug, the first protection section plug, the second protection section plug and the displacement section plug is 30% -50% of the large pore volume of the stratum, wherein the injection amount of the front-end section plug jelly dispersion is 2% -5% of the total injection amount, the injection amount of the main body section plug jelly dispersion is 10% -20% of the total injection amount, the injection amount of the first protection section plug jelly dispersion is 30% -40% of the total injection amount, the injection amount of the second protection section plug functional jelly dispersion is 35% -45% of the total injection amount, and the injection amount of the displacement section plug functional polymer is 0.5% -2% of the total injection amount.
2. The compound profile control process according to claim 1, wherein for the pre-slug gel dispersion, a shear rate of 50Hz is used for 6 cycles of shearing;
for the jelly dispersion of the main body slug, circularly shearing for 4 times by adopting a shearing rate of 40 Hz;
for the jelly dispersion of the first protection slug, 1 cycle of shear was performed using a shear rate of 15 Hz.
3. The compound profile control process according to claim 1, wherein the mass ratio of the gel dispersion to the surfactant is 0.5-1.5:1.
4. The compound profile control process according to claim 1, wherein in step B3, the conditions of the cyclic shearing treatment are specifically: the shearing was cycled 8 times with a shear rate of 90 Hz.
5. The compound profile control and flooding process according to claim 1, wherein the mass ratio of the functional gel dispersion to the stabilizer to the deoxidizer is 100:0.2-0.4:0.02-0.05.
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