CN114645690A - Composite profile control and flooding process for gel dispersion - Google Patents
Composite profile control and flooding process for gel dispersion Download PDFInfo
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- CN114645690A CN114645690A CN202011517455.2A CN202011517455A CN114645690A CN 114645690 A CN114645690 A CN 114645690A CN 202011517455 A CN202011517455 A CN 202011517455A CN 114645690 A CN114645690 A CN 114645690A
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- 239000006185 dispersion Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 20
- 235000015110 jellies Nutrition 0.000 claims abstract description 76
- 239000008274 jelly Substances 0.000 claims abstract description 76
- 239000007924 injection Substances 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003292 glue Substances 0.000 claims abstract description 28
- 239000000499 gel Substances 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 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 35
- 229920001002 functional polymer Polymers 0.000 claims description 26
- 239000003431 cross linking reagent Substances 0.000 claims description 23
- 229920000642 polymer Polymers 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000012744 reinforcing agent Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 8
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 8
- 229940064958 chromium citrate Drugs 0.000 claims description 7
- 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 7
- 239000003208 petroleum Substances 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
- 229940123973 Oxygen scavenger Drugs 0.000 claims description 5
- 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
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 4
- 239000000178 monomer 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
- 239000000377 silicon dioxide Substances 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
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 2
- 229940077388 benzenesulfonate Drugs 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
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 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 7
- 230000005465 channeling Effects 0.000 abstract description 5
- 239000010779 crude oil Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 13
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 230000018109 developmental process Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 235000019580 granularity Nutrition 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 2
- 239000004576 sand 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
- 208000035126 Facies Diseases 0.000 description 1
- 241000237858 Gastropoda Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 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
- 239000003129 oil well Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention relates to a composite profile control and flooding process for a gel dispersion, and belongs to the technical field of profile control and flooding of oil layers. The process comprises the following steps: sequentially injecting a front slug, a main slug, a first protection slug, a second protection slug and a displacement slug into the stratum; the front section plug, the main section plug and the first protection section plug are all made of jelly glue dispersoid and surfactant, and the second protection section plug is made of functional jelly glue dispersoid, stabilizer and deoxidant; the displacement slug adopts a functional jelly dispersion. The invention adopts a composite oil displacement system of the gel dispersion and the surfactant as a plugging agent, injects the composite oil displacement system of the gel dispersion and the surfactant into the front-located slug, adjusts the water injection displacement profile, inhibits the water channeling of a water injection dominant channel, improves the water displacement wave and volume of an underdeveloped reservoir, and achieves the purposes of improving the water injection efficiency and increasing the crude oil recovery ratio.
Description
Technical Field
The invention belongs to the technical field of oil layer profile control and flooding, and particularly relates to a composite profile control and flooding process for a gel dispersion.
Background
The reservoir permeability of the continental facies sedimentary oil field has large difference and strong heterogeneity. With the development of oil fields, the water drive water content rate is increased, and the water drive efficiency is low. In the later stage of water-drive oil production, 60-70% of original oil is still stored in an oil layer, so that how to improve the recovery ratio of residual oil becomes the key for increasing and stabilizing the yield of the high-water-content oil field.
Reservoir heterogeneity is one of main factors influencing high-temperature high-salt reservoir efficient development, so that the heterogeneity of a stratum needs to be regulated and controlled firstly to improve the water flooding development effect of the high-temperature high-salt reservoir in the middle and later periods. However, high-temperature and high-salinity oil reservoirs have deep burial depth, high temperature and high mineralization degree of formation water, and the complex conditions become technical difficulties facing the improvement of heterogeneity of reservoirs. At present, water flooding development is the main mode of reservoir development, but most reservoirs have unsatisfactory water drive effect, such as the problems of uneven water flooding, easy channeling of large pore canals and uneven effect of oil wells. Particularly, for riverway sand reservoirs, due to the fact that the center of each reservoir is high in permeability and low in permeability, the problems that water injection is easy to flow and the water injection efficiency is low exist, and the reservoir recovery ratio is seriously influenced.
Chinese patent application 201610506743.5 discloses a reinforced gel dispersion deep profile control agent suitable for low-permeability high-temperature high-salinity oil reservoirs. The enhanced gel dispersion deep profile control agent suitable for the low-permeability high-temperature high-salinity oil reservoir comprises a functional polymer, a cross-linking agent, an inorganic reinforcing agent and water according to the following mass fractions: 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 enhanced gel dispersion deep profile control agent has the average particle size distribution from nano-scale to micron-scale, can be used for deep profile control of low-permeability oil reservoirs, has good deep migration capacity, good profile improvement effect and obvious effect of improving the recovery ratio; the deep profile control agent can be used for deep profile control operation of high-temperature and high-salinity oil reservoirs.
Chinese patent application 201811229916.9 discloses a profile control agent obtained by reacting raw materials including 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 be fully dissolved, then adding a cross-linking agent, adding a stabilizing agent, and reacting for 6 to 8 hours at a temperature of between 90 and 110 ℃ to obtain jelly; 2) and (3) granulating the jelly to obtain the profile control agent particle 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: step 1, selecting a well; step 2, determining the dosage of the profile control and flooding agent: acquiring relevant parameters of a profile control agent and an oil layer, and calculating to obtain the dosage of the profile control agent and the oil layer; step 3, designing a slug combination: the method mainly comprises the steps of setting a jelly glue dispersion main body slug to carry out deep profile control and drive on a dominant channel, supplementing a post-positioned weak jelly slug according to the injection pressure condition to carry out protection, and then displacing to enable a profile control and drive agent to enter a required position. The invention can realize the consistent water breakthrough time of the production wells in different directions, thereby enlarging the water injection range 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 river sand reservoir water injection and oil displacement process: (1) the dynamic parameter adjusting effects such as pulse water injection, periodic water injection and the like are limited; (2) the prior microspheres and the surfactant have poor pertinence, and the profile control and flooding effects are not ideal; (3) the oil-increasing capacity of the single gel dispersion profile control flooding or the single surfactant flooding technology is limited.
Aiming at the technical problems, the application provides a composite profile control and flooding process for a gel dispersion, which adjusts a water injection displacement profile, inhibits water channeling of a water injection dominant channel, improves water flooding wave and volume of an under-developed reservoir stratum, and achieves the purposes of improving water injection efficiency and increasing crude oil recovery ratio.
Disclosure of Invention
The invention aims to provide a composite profile control and flooding process for a gel dispersion, which adopts a composite flooding system of the gel dispersion and a surfactant as a plugging agent, injects the composite flooding system of the gel dispersion and the surfactant into a front section plug, adjusts a water injection displacement profile, inhibits water channeling of a water injection dominant channel, improves the water flooding wave and volume of an underdeveloped reservoir stratum, and achieves the purposes of improving water injection efficiency and increasing crude oil recovery ratio.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a composite profile control and flooding process for a jelly dispersion comprises the following steps: and sequentially injecting a front section plug, a main body section plug, a first protection section plug, a second protection section plug and a displacement section plug into the stratum.
The front section plug, the main section plug and the first protection section plug are all made of jelly glue dispersoid and surfactant, and the second protection section plug is made of functional jelly glue dispersoid, stabilizer and deoxidant; the displacement slug adopts a functional polymer.
Preferably, the jelly glue dispersion comprises a polymer 1 and a cross-linking agent 1, wherein the polymer 1 is polyacrylamide, and the cross-linking agent 1 is selected from at least one of 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 jelly glue 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 jelly body 1;
and A3, carrying out circular shearing treatment on the jelly body 1 and water to obtain the jelly dispersoid.
Wherein the content of the first and second substances,
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 20-50 min.
In step A2, the heating temperature is 90-100 ℃.
In the step A2, the reaction time is 4-12 h.
In the step A3, the mass ratio of the jelly body 1 to the water is 0.5-2:1, preferably 1: 1.
In step a3, the conditions of the cyclic shearing treatment specifically include:
for the pre-slug jelly dispersion, the cyclic shearing is carried out for 5 to 8 times by adopting a shearing rate of 45 to 60Hz, and the cyclic shearing is preferably carried out for 6 times by adopting a shearing rate of 50 Hz;
for the jelly glue 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 first protective slug of the jelly glue dispersion, with 10-20Hz shear rate cycle shear 1-2 times, with 15Hz shear rate cycle shear 1 times.
Preferably, the surfactant is selected from at least one of alkyl benzene sulfonate, alkyl sulfonate, petroleum sulfonate, and petroleum carboxylate.
Preferably, the mass ratio of the jelly dispersion to the surfactant is 0.5-1.5:1, more preferably 1: 1.
Preferably, the functional jelly dispersion comprises an inorganic reinforcing agent, a functional polymer and a cross-linking agent 2, wherein the inorganic reinforcing agent is at least one selected from micro calcium carbonate, nano silicon dioxide, micro silicon dioxide and nano 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 selected from 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, acrylic acid, N-methylenebisacrylamide and butyl acrylate; the cross-linking agent 2 is selected from at least one of formaldehyde, glyoxal, chromium lactate, chromium citrate, chromium propionate, chromium acetate, aluminum salt and zirconium salt; further preferably, the mass ratio of the added amount of the crosslinking agent to the polymer is 4:1, and the mass ratio of the added amount of the inorganic reinforcing agent to the functional polymer is 1: 3.
Specifically, the functional jelly glue dispersion is prepared according to the following method:
b1, adding a cross-linking agent 2 and an inorganic reinforcing agent into the aqueous solution of the functional polymer, and stirring to obtain a system 2;
b2, heating the system 2, and reacting to obtain a jelly body 2;
b3, performing circulating shearing treatment on the jelly body 2 and water to obtain the functional jelly dispersoid.
Wherein, the first and the second end of the pipe are connected with each other,
in 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 20-50 min.
In step B2, the heating temperature is 90-100 ℃.
In the step B2, the reaction time is 4-12 h.
In the step B3, the mass ratio of the jelly body 2 to the water is 0.5-2:1, preferably 1: 1.
In step B3, the conditions of the cyclic shearing treatment specifically include:
circularly shearing for 8-10 times at a shearing rate of 70-120 Hz, preferably for 8 times at a shearing rate of 90 Hz;
preferably, the stabilizer is at least one selected from thiourea, aluminum sol and sodium thiosulfate.
Preferably, the oxygen scavenger is selected from at least one of sodium sulfite and sodium bisulfite.
Preferably, the mass ratio of the functional jelly dispersoid to the stabilizer to the oxygen scavenger is 100:0.2-0.4: 0.02-0.05.
Preferably, the total injection amount of the jelly glue dispersoid, the functional jelly glue dispersoid and the functional polymer of the front slug, the main slug, the first protective slug, the second protective slug and the displacement slug is 30-50% of the volume of a large pore canal of the stratum;
the injection amount of the front slug jelly dispersion accounts for 2-5% of the total injection amount, the injection amount of the main slug jelly dispersion accounts for 10-20% of the total injection amount, the injection amount of the first protective slug jelly dispersion accounts for 30-40% of the total injection amount, the injection amount of the second protective slug functional jelly dispersion plug accounts for 35-45% of the total injection amount, and the injection amount of the displacement slug functional polymer accounts for 0.5-2% of the total injection amount.
Preferably, the injection amount of the front slug jelly glue dispersoid accounts for 4 percent of the total injection amount, the injection amount of the main slug jelly dispersoid accounts for 16 percent of the total injection amount, the injection amount of the first protective slug jelly dispersoid accounts for 37 percent of the total injection amount, the injection amount of the second protective segment functional jelly dispersoid plug accounts for 42 percent of the total injection amount, and the injection amount of the displacement slug functional polymer accounts for 1 percent of the total injection amount.
The invention has the beneficial effects that:
(1) by injecting a composite oil displacement system of a jelly glue dispersion and a surfactant into the front-mounted slug, water channeling of a water injection dominant channel is inhibited, the water displacement wave and volume of an under-developed reservoir are improved, the water injection efficiency is improved, and the crude oil recovery rate is increased;
(2) the front slug, the main slug and the first protection slug adopt different shearing speeds and shearing cycle times to obtain the jelly dispersoid, so that the granularity of the jelly dispersoid injected by the front slug is finer, and unstable plugging is formed in the stratum, so that the stratum is difficult to form plugging when the front slug is injected, and the injection of the main slug and the first protection slug is not influenced;
(3) the jelly glue dispersoid with stepped granularity is adopted, so that the finally formed stratum plugging performance is stable, the water plugging effect is good, and meanwhile, the jelly glue dispersoids injected by different slugs have different granularities, so that the mutual filling can be realized in the filling process, and the water plugging effect is improved.
Detailed Description
The present invention will be further explained with reference to specific examples in order to make the technical means, the technical features, the technical objectives and the effects of the present invention easier to understand, but the following examples are only preferred embodiments of the present invention, and not all embodiments of the present invention. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. In the following examples, unless otherwise specified, all the procedures and equipment used were conventional procedures and equipment used was conventional equipment.
In the following examples, the gel dispersions and the functional gel dispersions were prepared using clear water in an amount of less than 10 g/L.
In the following examples, taking a Y2 well group in northwest as an example, the oil layer of the well group belongs to medium-hole medium-permeability sandstone, is a water-drive oil reservoir, has an effective thickness of 5-10m on average, and has obvious plane heterogeneity, interlayer heterogeneity and intrastratum heterogeneity, and the production degree is 15.3%. 226426.2m according to total pore volume3The macropore volume was estimated as: 22642.62m3And then designing the total injection amount as follows: 7500m3。
Example 1
A composite profile control and flooding process for a jelly dispersion comprises the following steps: and sequentially injecting a front slug, a main slug, a first protective slug, a second protective slug and a displacement slug into the stratum, wherein the total injection amount of the jelly glue dispersoid, the functional jelly dispersoid or the functional polymer of each slug is 40 percent of the volume of the 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: the gel dispersion and the surfactant are mixed according to the mass ratio of 1:1 (the surfactant is obtained by mixing alkyl sulfonate, petroleum sulfonate and petroleum carboxylate according to the mass ratio of 1:1: 0.5);
the second protection slug is: the functional jelly glue dispersion, the stabilizer (thiourea) and the oxygen scavenger (sodium sulfite) in a mass ratio of (100:0.3: 0.04);
the displacement slug adopts a functional polymer (2-acrylamide-2-methyl propane sulfonic acid, a functional polymer formed by sodium p-styrene sulfonate and acrylamide according to the mass ratio of 2: 1:18, and the molecular weight is 200-4500 w).
The jelly dispersion was prepared as follows:
a1: adding a cross-linking agent (obtained by mixing chromium citrate and formaldehyde with the mass ratio of 3:1) into a polymer (polyacrylamide with the molecular weight of 500-800w) water solution with the mass fraction of 0.3%, stirring for 30min, wherein the mass ratio of the chromium citrate to the formaldehyde is 4: 1;
a2: heating the system to 95 ℃, reacting for 8 hours, and aging to form a jelly body;
a3: the gel body was subjected to cyclic shearing under the conditions shown in table 1 to obtain a gel dispersion.
The functional jelly dispersoid is prepared by the following method:
b1: adding a cross-linking agent (prepared by mixing chromium citrate and formaldehyde with the mass ratio of 3:1) and an inorganic reinforcing agent (nano silicon dioxide with the particle diameter of 5-100 nanometers) into a functional polymer (a functional polymer formed by 2-acrylamide-2-methylpropanesulfonic acid, sodium p-styrenesulfonate and acrylamide with the mass ratio of 2: 1:18) aqueous solution with the mass fraction of 0.3%, wherein the mass ratio of the addition amount of the cross-linking agent to the polymer is 4:1, and the mass ratio of the addition amount of the inorganic reinforcing agent to the functional polymer is 1: 3; then stirring for 30 min;
b2: heating the system to 95 ℃, reacting for 8 hours, and aging to form a gel body;
b3: and (3) carrying out cyclic shearing treatment on the jelly body under the shearing conditions shown in the table 2 to obtain the functional jelly dispersoid.
Table 2.
Profile control effect detection
The gel dispersion of the example was added to the Y2 well and the oil gain of two wells, Y5 and Y9, was counted for the cumulative oil gain compared to the oil gain before the gel dispersion profile flooding was performed.
The detection results are as follows:
table 3.
The present invention is not limited to the above-described preferred embodiments, but rather, the present invention is to be construed broadly and cover all modifications, equivalents, and improvements falling within the spirit and scope of the present invention.
Claims (10)
1. The composite profile control and flooding process for the jelly dispersoid is characterized by comprising the following steps of: sequentially injecting a front slug, a main slug, a first protection slug, a second protection slug and a displacement slug into the stratum;
the front section plug, the main section plug and the first protection section plug are all made of jelly glue dispersoid and surfactant, and the second protection section plug is made of functional jelly glue dispersoid, stabilizer and deoxidant; the displacement slug adopts a functional polymer.
2. The composite profile control process according to claim 1, wherein the surfactant is selected from at least one of alkyl benzene sulfonate, alkyl sulfonate, petroleum sulfonate, and petroleum carboxylate; the jelly glue dispersion comprises a polymer 1 and a cross-linking agent 1, wherein the polymer 1 is polyacrylamide, and the cross-linking agent 1 is selected from at least one of 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.
3. The composite profile control flooding process according to claim 2, characterized in that said 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 jelly body 1;
a3, subjecting the jelly body 1 and water to circulating shearing treatment to obtain the jelly dispersoid.
4. The composite profile control and flooding process according to claim 3, wherein in step A3, the mass ratio of the jelly body 1 to water is 0.5-2:1, and the conditions of the circulating shearing treatment specifically are as follows:
for the pre-slug jelly dispersion, the cyclic shearing is carried out for 5 to 8 times by adopting a shearing rate of 45 to 60Hz, and the cyclic shearing is preferably carried out for 6 times by adopting a shearing rate of 50 Hz;
for the jelly glue dispersion of the main body slug, circularly shearing for 3-5 times by adopting a shearing rate of 35-45Hz, and preferably circularly shearing for 4 times by adopting a shearing rate of 40 Hz;
for the first protective slug of the jelly glue dispersion, the shear is cycled 1-2 times with a shear rate of 10-20Hz, preferably 1 time with a shear rate of 15 Hz.
5. The composite profile control flooding process according to claim 1, characterized in that the mass ratio of the jelly glue dispersion to the surfactant is 0.5-1.5: 1.
6. The composite profile control and flooding process according to claim 1, characterized in that said stabilizer is selected from at least one of thiourea, alumina sol, sodium thiosulfate; the oxygen scavenger is selected from at least one of sodium sulfite and sodium bisulfite; the functional jelly dispersion comprises an inorganic reinforcing agent, a functional polymer and a cross-linking agent 2, wherein the inorganic reinforcing agent is at least one selected from 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 selected from 2-acrylamide-2-methyl propane sulfonic acid, sodium p-styrene sulfonate, acrylic acid, N-methylene-bisacrylamide 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 addition amount of the cross-linking agent to the functional polymer is 4:1, and the mass ratio of the addition amount of the inorganic reinforcing agent to the functional polymer is 1: 3.
7. The composite profile control flooding process according to claim 6, characterized in that said functional jelly dispersion is prepared according to the following method:
b1, adding a cross-linking agent 2 and an inorganic reinforcing agent into the aqueous solution of the functional polymer, and stirring to obtain a system 2;
b2, heating the system 2, and reacting to obtain a jelly body 2;
b3, performing circulating shearing treatment on the jelly body 2 and water to obtain the functional jelly dispersoid.
8. The composite profile control and flooding process according to claim 7, characterized in that in step B1, the mass fraction of the aqueous solution of the functional polymer is 0.2-0.5%, and the stirring time is 20-50 min;
in the step B2, the heating temperature is 90-100, and the reaction time is 4-12 h;
in the step B3, the mass ratio of the jelly body 2 to the water is 0.5-2:1, and the conditions of the circulating shearing treatment are as follows:
and circularly shearing 8-10 times at a shearing rate of 70-120 Hz, preferably 8 times at a shearing rate of 90 Hz.
9. The composite profile control and flooding process according to claim 1, characterized in that the mass ratio of the functional jelly dispersion to the stabilizer to the oxygen scavenger is 100:0.2-0.4: 0.02-0.05.
10. The composite profile control and flooding process according to claim 1, wherein the total injection amount of the jelly glue dispersoids, the functional jelly glue dispersoids and the functional polymers of the front slug, the main slug, the first protective slug, the second protective slug and the displacement slug is 30-50% of the volume of the large pore canal of the stratum, wherein the injection amount of the jelly glue dispersoids of the front slug accounts for 2-5% of the total injection amount, the injection amount of the jelly dispersoids of the main slug accounts for 10-20% of the total injection amount, the injection amount of the jelly glue dispersoids of the first protective slug accounts for 30-40% of the total injection amount, the injection amount of the functional jelly dispersoids of the second protective slug accounts for 35-45% of the total injection amount, and the injection amount of the functional polymers of the displacement slug accounts for 0.5-2% of the total injection amount.
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