CN106867497A - A kind of oil displacement system and flooding method for low-permeability oil deposit - Google Patents
A kind of oil displacement system and flooding method for low-permeability oil deposit Download PDFInfo
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- CN106867497A CN106867497A CN201710194024.9A CN201710194024A CN106867497A CN 106867497 A CN106867497 A CN 106867497A CN 201710194024 A CN201710194024 A CN 201710194024A CN 106867497 A CN106867497 A CN 106867497A
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- Prior art keywords
- oil
- oil displacement
- displacement system
- polymer
- surfactant
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims description 13
- 229920000642 polymer Polymers 0.000 claims abstract description 152
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 230000035699 permeability Effects 0.000 claims abstract description 99
- 239000000178 monomer Substances 0.000 claims abstract description 53
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 35
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 198
- 235000019198 oils Nutrition 0.000 claims description 197
- 239000004094 surface-active agent Substances 0.000 claims description 59
- -1 methacrylate Ester Chemical class 0.000 claims description 41
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 22
- 229910052731 fluorine Inorganic materials 0.000 claims description 19
- 239000011737 fluorine Substances 0.000 claims description 18
- 125000001153 fluoro group Chemical group F* 0.000 claims description 18
- 125000005250 alkyl acrylate group Chemical group 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 17
- 238000006467 substitution reaction Methods 0.000 claims description 17
- 239000003513 alkali Substances 0.000 claims description 16
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 14
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 150000003926 acrylamides Chemical class 0.000 claims description 9
- 125000003342 alkenyl group Chemical group 0.000 claims description 9
- 150000002148 esters Chemical class 0.000 claims description 8
- 150000007942 carboxylates Chemical class 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 6
- 150000001412 amines Chemical class 0.000 claims description 5
- 239000002585 base Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 125000000623 heterocyclic group Chemical group 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 4
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 claims description 3
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 229940077388 benzenesulfonate Drugs 0.000 claims description 3
- 239000002736 nonionic surfactant Substances 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 3
- 239000008158 vegetable oil Substances 0.000 claims description 3
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 2
- 239000003945 anionic surfactant Substances 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims 1
- 150000001335 aliphatic alkanes Chemical class 0.000 claims 1
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical class C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims 1
- 150000004040 pyrrolidinones Chemical class 0.000 claims 1
- 125000001273 sulfonato group Chemical class [O-]S(*)(=O)=O 0.000 claims 1
- 229920002554 vinyl polymer Polymers 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 53
- 238000002347 injection Methods 0.000 abstract description 38
- 239000007924 injection Substances 0.000 abstract description 38
- 238000010008 shearing Methods 0.000 abstract description 26
- 230000032683 aging Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 43
- 239000007788 liquid Substances 0.000 description 39
- 239000011435 rock Substances 0.000 description 31
- 239000000203 mixture Substances 0.000 description 25
- 238000011056 performance test Methods 0.000 description 20
- 230000000694 effects Effects 0.000 description 17
- 238000012360 testing method Methods 0.000 description 16
- 238000011049 filling Methods 0.000 description 14
- 230000014759 maintenance of location Effects 0.000 description 14
- 239000011148 porous material Substances 0.000 description 14
- 229910002056 binary alloy Inorganic materials 0.000 description 13
- 229920002401 polyacrylamide Polymers 0.000 description 13
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 12
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 12
- 229910001424 calcium ion Inorganic materials 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 12
- 229910001425 magnesium ion Inorganic materials 0.000 description 12
- 239000004576 sand Substances 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002131 composite material Substances 0.000 description 8
- 239000012530 fluid Substances 0.000 description 8
- 230000002441 reversible effect Effects 0.000 description 8
- 239000010779 crude oil Substances 0.000 description 7
- 241000894007 species Species 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000003708 ampul Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 239000012452 mother liquor Substances 0.000 description 6
- 230000006641 stabilisation Effects 0.000 description 6
- 238000011105 stabilization Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 4
- 230000003213 activating effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 150000003871 sulfonates Chemical class 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- 235000003140 Panax quinquefolius Nutrition 0.000 description 3
- 240000005373 Panax quinquefolius Species 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 150000001408 amides Chemical class 0.000 description 3
- 238000006392 deoxygenation reaction Methods 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- HVBSAKJJOYLTQU-UHFFFAOYSA-N 4-aminobenzenesulfonic acid Chemical compound NC1=CC=C(S(O)(=O)=O)C=C1 HVBSAKJJOYLTQU-UHFFFAOYSA-N 0.000 description 2
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 210000000867 larynx Anatomy 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- SSQCUKBLGVTCOC-UHFFFAOYSA-N 2-methyl-2-(prop-2-enoylamino)dodecane-1-sulfonic acid Chemical class C(C=C)(=O)NC(CS(=O)(=O)O)(CCCCCCCCCC)C SSQCUKBLGVTCOC-UHFFFAOYSA-N 0.000 description 1
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000002511 behenyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- GMSCBRSQMRDRCD-UHFFFAOYSA-N dodecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCOC(=O)C(C)=C GMSCBRSQMRDRCD-UHFFFAOYSA-N 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- JRUSUOGPILMFBM-UHFFFAOYSA-N n,n-dioctylprop-2-enamide Chemical class CCCCCCCCN(C(=O)C=C)CCCCCCCC JRUSUOGPILMFBM-UHFFFAOYSA-N 0.000 description 1
- XQPVIMDDIXCFFS-UHFFFAOYSA-N n-dodecylprop-2-enamide Chemical class CCCCCCCCCCCCNC(=O)C=C XQPVIMDDIXCFFS-UHFFFAOYSA-N 0.000 description 1
- AWGZKFQMWZYCHF-UHFFFAOYSA-N n-octylprop-2-enamide Chemical class CCCCCCCCNC(=O)C=C AWGZKFQMWZYCHF-UHFFFAOYSA-N 0.000 description 1
- GZGWBUJWNXQXKV-UHFFFAOYSA-N n-tetradecan-2-ylprop-2-enamide Chemical class CCCCCCCCCCCCC(C)NC(=O)C=C GZGWBUJWNXQXKV-UHFFFAOYSA-N 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- QLNJFJADRCOGBJ-UHFFFAOYSA-N propionamide Chemical compound CCC(N)=O QLNJFJADRCOGBJ-UHFFFAOYSA-N 0.000 description 1
- 229940080818 propionamide Drugs 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229950000244 sulfanilic acid Drugs 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- ATZHWSYYKQKSSY-UHFFFAOYSA-N tetradecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCOC(=O)C(C)=C ATZHWSYYKQKSSY-UHFFFAOYSA-N 0.000 description 1
- 125000003698 tetramethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- C09K8/58—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
-
- 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
- C09K8/584—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 surfactants
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Include association polymer the invention provides a kind of oil displacement system for LOW PERMEABILITY RESERVOIR；The molecular weight of the association polymer is 101.4~997.5 ten thousand；In mole percent, function monomer of the association polymer by acrylamide, 0.09%~10.2% hydrophobic monomer with 0~15.4% is polymerized and obtains；The concentration of association polymer is 200~3500mg/L in the oil displacement system.Compared with prior art, the present invention uses and the association polymer that a small amount of hydrophobic monomer and function monomer are obtained is introduced on polymer molecular chain, hydrophobic grouping is associated with spacial framework in aqueous, so as to increase substantially system viscosity, set up resistance coefficient and residual resistance factor high high, function monomer is introduced and spacial framework, hence in so that system has good heat and salinity tolerance anti-shearing and ageing stability, having to LOW PERMEABILITY RESERVOIR preferably improve oil and water mobility ratio to act on, improve injection water sweep efficiency, so as to preferably improve LOW PERMEABILITY RESERVOIR recovery ratio.
Description
Technical field
The invention belongs to technical field of petroleum extraction, more particularly to a kind of oil displacement system and the displacement of reservoir oil for low-permeability oil deposit
Method.
Background technology
With the carrying out of petroleum exploration and development, the shared ratio in new proved reserves of low permeability oil field is increasing.It is low
Infiltration oil reservoir occupies more than half for the oil gas field that China has found, its Productivity Construction scale accounts for total amount more than 70%, hypotonic
Saturating oil gas field has become the main battle ground of oil and gas development construction.LOW PERMEABILITY RESERVOIR is smaller due to its pore throat and flaw size, capillary
Phenomenon is protruded, and oil gas flow resistance is big, causes its development difficulty big, and recovery ratio is low, therefore how preferably it to be developed,
It is the inexorable trend of current research.
For LOW PERMEABILITY RESERVOIR, the polymer flooding in chemical flooding has obtained extensive concern as a kind of important method.With
The addition of polymer, system viscosity rises, vadose zone high or crack that closure has been formed expand water drive swept volume, adjust
Site preparation layer water injection profile, with suitable application potential.Research has shown that, as long as meeting pore throat radius and polymer molecule
The matching of Coil Gyration Radius, polymer would not block oil reservoir.Meanwhile, polymer flooding is compared with surfactant flooding and caustic waterflooding
Easy construction, few consumption, low cost, effect are good, therefore, the polymer of matching LOW PERMEABILITY RESERVOIR is developed to be harvested after improving water drive
Rate is the emphasis of current research.And surfactant or alkali also have suitable advantage in terms of recovery ratio is improved, in polymer
Add surfactant or alkali to be configured to binary, the method for ternary system and carry out reduces cost in oil displacement system, give full play to surface
Activating agent and alkali reduction interfacial tension, improve displacement efficiency, and reduces cost and polymer improve the performance advantage of intake profile,
It is of great interest, with larger potentiality.
For LOW PERMEABILITY RESERVOIR, polymer molecular weight is unsuitable too high, and otherwise easily blocking stratum makes follow-up displacing fluid be difficult to inject.
Natural polymer molecular weight is difficult to control, and a large amount of residues is also easy to produce after decomposition and blocks stratum, is unsuitable for the use of low-permeability oil deposit,
And it is subject to season and territorial restrictions and relatively costly, heat endurance and biological stability are relatively poor, easily degrade, therefore
Application in high temperature and high salt oil deposit is restricted；Polyacrylamide is used as ripe synthesis macromolecule, although can be certain
Solution viscosity is improved in degree, but it is easy to send out molecule long-chain due to the effect of borehole intensive shear in work progress
Raw fracture, causes displacement fluid viscosity irreversibly to lose；It is vulnerable to ground environment (temperature, salinity) influence, there is following asking
Topic：1) when being applied under the conditions of high temperature and high salinity, the hydrolysis of polyacrylamide is serious when temperature is higher；2) formation temperature exceedes
After 75 DEG C, as formation temperature is raised, hydrolyzed polyacrylamide precipitates to form quickening；3) high temperature and high salt is easily caused hydrolysis polypropylene
Acid amides is precipitated out from the aqueous solution, and degree of hydrolysis this phenomenon more high is more notable；4) solution viscosity is non-to temperature and salinity
Often sensitive, the reservation viscosity of solution is very low in high temperature and high salt environment.So polyacrylamide should under slightly harsh reservoir condition
With being extremely restricted.Importantly, due in LOW PERMEABILITY RESERVOIR, polymer molecular weight is unsuitable too high, and polyacrylamide can be compared with
Its polymer viscosity is relatively low after low permeability formation, but molecular weight reduction are matched simply to reduce molecular weight, increases the concentration displacement of reservoir oil,
Cost certainly will increase, and if using the heavy polymer displacement of reservoir oil, its molecular coil size is likely larger than LOW PERMEABILITY RESERVOIR pore throat
Size, easily blocks stratum, causes injection difficult；And it is more single due to determining its molecular coil dimension adjustable parameter, with
LOW PERMEABILITY RESERVOIR pore throat matching is poor, and the resistance coefficient of foundation, residual resistance factor is smaller, it is impossible to preferably plays and effectively expands ripple
And the effect of volume and closure water drive predominant pathway.It is and exhausted when adding surfactant and alkali to be configured to binary (ternary) system
Most of surfactants, alkali act on the reduction (negative coopertive effect) that its viscosity and viscoplasticity all can be different degrees of；And it is low in low concentration
Structure is weak under viscosity, viscoplasticity is poor, the reduction of fluidity control ability.For problem above, plain polypropylene acid amides can only due to it
Molecular regulator amount and degree of hydrolysis and adjustable range is limited, have been difficult further to overcome on the basis of its existing molecular structure,
It is thus impossible to meet the Efficient Development demand of low-permeability oilfield.
The content of the invention
In view of this, the technical problem to be solved in the present invention be provide a kind of oil displacement system for low-permeability oil deposit and
Flooding method, the oil displacement system consumption is small, superior performance, can set up real high resistant force coefficient and residual resistance factor high,
And LOW PERMEABILITY RESERVOIR water drive and poly- drive recovery ratio can be increased substantially.
The invention provides a kind of oil displacement system for LOW PERMEABILITY RESERVOIR, including association polymer；The association polymer
Molecular weight be 101.4~997.5 ten thousand；In mole percent, the association polymer by acrylamide, 0.09%~
10.2% hydrophobic monomer is polymerized with 0~15.4% function monomer and obtains；The concentration of association polymer in the oil displacement system
It is 200~3500mg/L；
The hydrophobic monomer is selected from N- alkyl-substituted acrylamides and its derivative, alkyl acrylate, methacrylic acid
Arrcostab, the alkyl acrylate of fluorine substitution, alkyl methacrylate, allyl alkyl quaternary ammonium salt, the acryloyl of fluorine substitution
One kind or many in amine alkyl sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate and acrylic acid polyxyethylated ester
Kind；
The function monomer is selected from sulfonic acid and its sulfonate derivatives containing end alkenyl and contains end alkenyl
One or more in Hete rocyclic derivatives.
Preferably, the N- alkyl-substituted acrylamides and its derivative, alkyl acrylate, methacrylate
Ester, allyl alkyl quaternary ammonium salt, acrylic acid alkyl sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate, acrylic acid gather
The carbon number of alkyl is each in the alkyl methacrylate of oxygen vinyl alkyl ester, the alkyl acrylate of fluorine substitution and fluorine substitution
From independently being 4~40.
Preferably, the function monomer is selected from 2- acrylamide-2-methylpro panesulfonic acids and its sulfonate, vinyl sulfonic acid
And its one or more in sulfonate, styrene sulfonic acid and its sulfonate and NVP.
Preferably, also including surfactant；The quality of the surfactant is the 0.001% of associtation polymer amount of substance
~0.73%.
Preferably, the surfactant is petroleum sulfonate analog anion surfactants, alkyl benzene sulfonate the moon
Ionic surface active agent, alpha-alkene sulfonate anionoid surfactant, betaines both sexes surfactant, alkanolamide class nonionic
Surfactant, non-ionic gemini surface active agent, anionic gemini surfactant, alkylnaphthalene sulfonate, lignin sulfonic acid
One or more in salt, vegetable oil carboxylate, petroleum carboxylate, biological species surfactant and complexed surfactant.
Preferably, also including alkaline matter；The quality of the alkaline matter for associtation polymer amount of substance 0.09%~
2.17%.
Preferably, the alkaline matter is NaOH, Na2CO3With one or more in amine organic base.
Preferably, it is a, 3mD≤a ＜ 50mD that the water of the LOW PERMEABILITY RESERVOIR surveys permeability.
Present invention also offers a kind of flooding method of LOW PERMEABILITY RESERVOIR, entered using the above-mentioned oil displacement system for LOW PERMEABILITY RESERVOIR
The row displacement of reservoir oil.
Compared with prior art, association polymer is included the invention provides a kind of oil displacement system for LOW PERMEABILITY RESERVOIR；
The molecular weight of the association polymer is 101.4~997.5 ten thousand；In mole percent, the association polymer is by acryloyl
The function monomer of amine, 0.09%~10.2% hydrophobic monomer with 0~15.4% is polymerized and obtains；Associated in the oil displacement system poly-
The concentration of compound is 200~3500mg/L；The hydrophobic monomer is selected from N- alkyl-substituted acrylamides and its derivative, acrylic acid
Arrcostab, alkyl methacrylate, the alkyl acrylate of fluorine substitution, alkyl methacrylate, the pi-allyl of fluorine substitution
Alkyl quaternary ammonium salts, acrylamide alkyl sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate and acrylic acid polyoxyethylene
One or more in Arrcostab；The function monomer be selected from containing end alkenyl sulfonic acid and its sulfonate derivatives with
One or more in Hete rocyclic derivatives containing end alkenyl.Compared with prior art, the present invention is using on polymer molecule
Association polymer that a small amount of hydrophobic grouping and function monomer obtain is introduced as oil displacement system, with the introducing of hydrophobic grouping, this
In a little macromoleculars or intermolecular hydrophobic grouping is mutually associated due to hydrophobic effect in aqueous, reversible three dimensions is formed
Dynamic physical cross-linked network, it is cost-effective so as to have viscosity and elasticity higher in lower molecular weight and low concentration,
This reversible construction has the characteristic broken and be able to when shear action reduces or disappears under intensive shear effect and recovered,
Solve the problems, such as traditional polymer by the irreversible loss viscosity of Strong shear effect；Molecular coil aggregation being capable of possibility of reversal
Shape, in the case where the good injection of oil reservoir is ensured, due to the introducing of hydrophobic monomer, sets up real high resistant force coefficient and height is residual
Residual resistance coefficient, effectively reduces Relative High Permeability region permeability, and with preferable profile control effect, improvement is subsequently implanted into ripples
And efficiency；Function monomer is introduced and association spacial framework intensity increases as solution polarity increases so that system has
Good heat and salinity tolerance is anti-shearing and ageing stability；Molecule can be changed by content of hydrophobic monomers, species and the change of molecular weight
Coil dimension, so as to match with LOW PERMEABILITY RESERVOIR pore throat under low-molecular-weight low concentration, it is ensured that polymer injection and energy deep
The conduction displacement of reservoir oil；Having to LOW PERMEABILITY RESERVOIR preferably improve oil and water mobility ratio to act on, and improvement is subsequently implanted into water sweep efficiency；Due to solution
The presence of middle three dimensions dynamic physical cross-linked network, system elasticity is significantly raised, and improves polymer microscopic oil displacement efficiency, so that
Recovery ratio after the water drive of LOW PERMEABILITY RESERVOIR can preferably be improved；When adding surfactant and alkali to be configured to binary (ternary) system,
While association polymer advantage is ensured, the performances such as system viscosity and elasticity can be increased substantially and (produce positive coorperativity effect
Should), and the surfactant and alkali of addition can increase substantially system displacement efficiency, so that in High water cut, recovery percent of reserves high
LOW PERMEABILITY RESERVOIR under the conditions of can increase substantially water drive and poly- drive recovery ratio.
Test result indicate that, provided by the present invention for LOW PERMEABILITY RESERVOIR solution concentration between 200~3500mg/L,
3.2~250.0mPa.s of viscosity, mechanical shearing viscosity retention ratio is 61.43%~97.00%, and aged viscosity retention rate is within 90 days
56.80%~99.50%, resistance coefficient is 84.0~764.2, and residual resistance factor is 23.4~206.0, improves recovery ratio journey
Spend is 8.14%~26.93%.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
The present invention provides a kind of oil displacement system for LOW PERMEABILITY RESERVOIR, including association polymer；The association polymer
Molecular weight is 101.4~997.5 ten thousand；In mole percent, the association polymer is by acrylamide, 0.09%~10.2%
Function monomer of the hydrophobic monomer with 0~15.4% be polymerized and obtain；In the oil displacement system concentration of association polymer be 200~
3500mg/L；The hydrophobic monomer is selected from N- alkyl-substituted acrylamides and its derivative, alkyl acrylate, methacrylic acid
Arrcostab, the alkyl acrylate of fluorine substitution, alkyl methacrylate, allyl alkyl quaternary ammonium salt, the acryloyl of fluorine substitution
One kind or many in amine alkyl sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate and acrylic acid polyxyethylated ester
Kind；The function monomer is selected from sulfonic acid and its sulfonate derivatives containing end alkenyl and spreads out with the heterocycle containing end alkenyl
One or more in biology.
In some embodiments that the present invention is provided, the molecular weight of the association polymer is preferably 103.6 ten thousand；In this hair
In some embodiments of bright offer, the molecular weight of the association polymer is preferably 112.4 ten thousand；In some realities that the present invention is provided
Apply in example, the molecular weight of the association polymer is preferably 201.5 ten thousand；It is described to form in some embodiments that the present invention is provided
The molecular weight for closing polymer is preferably 587.4 ten thousand；In some embodiments that the present invention is provided, the molecule of the association polymer
Amount is preferably 610.2 ten thousand；In other embodiments that the present invention is provided, the molecular weight of the association polymer is preferably
996.7 ten thousand.
In some embodiments that the present invention is provided, the content of the hydrophobic monomer is preferably 0.1%；There is provided in the present invention
Some embodiments in, the content of the hydrophobic monomer is preferably 0.83%；It is described in some embodiments that the present invention is provided
The content of hydrophobic monomer is preferably 3.6%；In some embodiments that the present invention is provided, the content of the hydrophobic monomer is preferably
4.25%；In some embodiments that the present invention is provided, the content of the hydrophobic monomer is preferably 6.24%；There is provided in the present invention
Other embodiments in, the content of the hydrophobic monomer is preferably 9.96%.
The hydrophobic monomer is selected from N- alkyl-substituted acrylamides and its derivative, alkyl acrylate, methacrylic acid
Arrcostab, the alkyl acrylate of fluorine substitution, alkyl methacrylate, allyl alkyl quaternary ammonium salt, the acryloyl of fluorine substitution
One kind or many in amine alkyl sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate and acrylic acid polyxyethylated ester
Kind；Wherein, the N- alkyl-substituted acrylamides and its derivative, alkyl acrylate, alkyl methacrylate, pi-allyl
Alkyl quaternary ammonium salts, acrylic acid alkyl sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate, acrylic acid are polyxyethylated
Alkyl methacrylate, allyl alkyl quaternary ammonium salt, the acrylamide alkane of ester, the alkyl acrylate of fluorine substitution and fluorine substitution
Base sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate or in acrylic acid polyxyethylated ester alkyl carbon number
4~40, more preferably 4~20 are each independently, are further preferably 6~20.
The N- alkyl-substituted acrylamides derivative preferably comprises the derivative of benzene ring structure；The alkyl phenol polyoxy second
The polyoxyethylated degree of polymerization is preferably 7~20 independently of one another in alkene acrylate and acrylic acid polyxyethylated ester, more excellent
Elect 7~16 as；The number of fluorine atom is each in the alkyl methacrylate that the alkyl acrylate of the fluorine substitution replaces with fluorine
From independently be preferably 4~10, more preferably 6~8, most preferably 2- (N- ethylperfluoros sulfanilic acid) EMAs or
2- (N- ethylperfluoros octane) butyl methacrylate；Heretofore described hydrophobic monomer is most preferably dodecyl acrylate, third
Olefin(e) acid hexadecyl ester, lauryl methacrylate, hexadecyl metrhacrylate, N- dodecylacrylamides, N- cetyls third
Acrylamide, N- octyl groups propionamide, 2- acrylamido -2- methyl docosyls sodium sulfonate, N- myristyls acrylamide, N,
N- dioctyl acrylamides, Hexafluorobutyl mathacrylate, tetradecyl methylacrylate, cetyl pi-allyl dibrominated tetramethyl
Base ethylenediamine, 2- acrylamido tetradecanes sodium sulfonate, 2- acrylamido -2- methyl dodecane sulfonic acids sodium, polyoxyethylene nonyl phenyl
Ethylene-acrylate, octyl phenol polyoxyethylene acrylate, dodecyl polyoxyethylene acrylate, octadecyl pi-allyl two
Bromination tetramethylethylenediamine, cetyl polyoxyethylene acrylate, N- cetyls acrylamide, N- octyl acrylamides,
The ammonium of sodium dodecyl allyl base dibrominated tetramethyl fourth two, myristyl pi-allyl dichloride tetramethyl butane diamine and (4- acryloyls
Amido) one or more in phenyl normal-butyl ditallowdimethyl ammonium bromide.
In some embodiments that the present invention is provided, the content of the function monomer is preferably 0%；There is provided in the present invention
In some embodiments, the content of the function monomer is preferably 3.8%；In some embodiments that the present invention is provided, the work(
The content of energy monomer is preferably 4.1%；In some embodiments that the present invention is provided, the content of the function monomer is preferably
11.9%；In some embodiments that the present invention is provided, the content of the function monomer is preferably 12.2%；There is provided in the present invention
Some embodiments in, the content of the function monomer is preferably 13.8%；In other embodiments that the present invention is provided, institute
The content for stating function monomer is preferably 14.6%.
The function monomer is selected from sulfonic acid and its sulfonate derivatives containing end alkenyl and contains end alkenyl
One or more in Hete rocyclic derivatives；The carbon number of the function monomer is preferably 2~20, more preferably 2~15, then excellent
Elect 2~10 as；In the present invention, the function monomer is most preferably 2- acrylamide-2-methylpro panesulfonic acids (AMPS) and its sulphur
In hydrochlorate, vinyl sulfonic acid and its sulfonate, styrene sulfonic acid and its sulfonate and NVP (NVP)
One or more.
Provided by the present invention for the oil displacement system of LOW PERMEABILITY RESERVOIR；The LOW PERMEABILITY RESERVOIR is well known to those skilled in the art
LOW PERMEABILITY RESERVOIR, has no special limitation, and it is a, 3mD≤a ＜ 50mD that the water of heretofore described LOW PERMEABILITY RESERVOIR surveys permeability.
The oil displacement system include association polymer, in the oil displacement system concentration of association polymer be 200~
3500mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
400mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably 500mg/ in the oil displacement system
L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably 800mg/L in the oil displacement system；At this
Invent in some embodiments for providing, the concentration of association polymer is preferably 1800mg/L in the oil displacement system；In the present invention
In some embodiments for providing, the concentration of association polymer is preferably 2500mg/L in the oil displacement system；There is provided in the present invention
Some embodiments in, the concentration of association polymer is preferably 700mg/L in the oil displacement system；In some for providing of the invention
In embodiment, the concentration of association polymer is preferably 2800mg/L in the oil displacement system；In some implementations that the present invention is provided
In example, the concentration of association polymer is preferably 3000mg/L in the oil displacement system；In some embodiments that the present invention is provided,
The concentration of association polymer is preferably 2000mg/L in the oil displacement system；It is described in some embodiments that the present invention is provided
The concentration of association polymer is preferably 1000mg/L in oil displacement system；In some embodiments that the present invention is provided, the displacement of reservoir oil
The concentration of association polymer is preferably 1200mg/L in system；In some embodiments that the present invention is provided, the oil displacement system
The concentration of middle association polymer is preferably 1300mg/L；In some embodiments that the present invention is provided, formed in the oil displacement system
The concentration for closing polymer is preferably 2600mg/L；Associated in some embodiments that the present invention is provided, in the oil displacement system poly-
The concentration of compound is preferably 3500mg/L；In some embodiments that the present invention is provided, association polymer in the oil displacement system
Concentration be preferably 600mg/L；In some embodiments that the present invention is provided, the concentration of association polymer in the oil displacement system
Preferably 1600mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferred in the oil displacement system
It is 1500mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
3100mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
800mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
2200mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
2400mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
1100mg/L；In some embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
900mg/L；In other embodiments that the present invention is provided, the concentration of association polymer is preferably in the oil displacement system
3200mg/L。
The present invention uses and the association polymer work that a small amount of hydrophobic grouping and function monomer are obtained is introduced on polymer molecule
It is oil displacement system, with the introducing of hydrophobic grouping, in these macromoleculars or intermolecular hydrophobic grouping is in aqueous due to dredging
Water is acted on and mutually associated, and forms reversible three dimensions dynamic physical cross-linked network, so as in lower molecular weight and low concentration
When can have viscosity and elasticity higher, cost-effective, this reversible construction has is broken and is worked as under intensive shear effect
Shear action reduces or is able to when disappearing the characteristic recovered, and solves traditional polymer viscous by the irreversible loss of Strong shear effect
The problem of degree；Molecular coil aggregation can reversible deformation, ensure the good injection of oil reservoir in the case of, due to hydrophobic monomer
Introducing, set up real high resistant force coefficient and residual resistance factor high, effectively reduce Relative High Permeability region permeability, with compared with
Good profile control effect, improvement is subsequently implanted into water sweep efficiency；Function monomer introduce and association spacial framework intensity with
Solution polarity increases and increases so that system has good heat and salinity tolerance anti-shearing and ageing stability；Can be by hydrophobic
Content of monomer, species and the change of molecular weight change molecular coil size, so as under low-molecular-weight low concentration with LOW PERMEABILITY RESERVOIR hole
Larynx matches, it is ensured that polymer injection and the conduction displacement of reservoir oil of energy deep；Having to LOW PERMEABILITY RESERVOIR preferably improve oil and water mobility ratio to make
With improvement is subsequently implanted into water sweep efficiency；Due to the presence of three dimensions dynamic physical cross-linked network in solution, system elasticity is big
Width is raised, and improves polymer microscopic oil displacement efficiency, so as to recovery ratio after the water drive for preferably improving LOW PERMEABILITY RESERVOIR；Add surface
When activating agent and alkali are configured to binary (ternary) system, while association polymer advantage is ensured, body can be increased substantially
It is the performances such as viscosity and elasticity (generation positive coopertive effect), and the surfactant and alkali of addition can increase substantially system and wash
Oily efficiency, so as to water drive and poly- drive recovery ratio can be increased substantially under the conditions of High water cut, the LOW PERMEABILITY RESERVOIR of recovery percent of reserves high.
Therefore, the oil displacement system that the present invention is provided preferably also includes surfactant, and the quality of the surfactant is
The 0.001%~0.73% of associtation polymer amount of substance；In some embodiments that the present invention is provided, the surfactant is preferred
It is the 0.001% of associtation polymer amount of substance；In some embodiments that the present invention is provided, the surfactant is preferably association
The 0.06% of polymer quality；In some embodiments that the present invention is provided, the surfactant is preferably association polymer
The 0.59% of quality；In some embodiments that the present invention is provided, the surfactant is preferably associtation polymer amount of substance
0.01%；In some embodiments that the present invention is provided, the surfactant is preferably the 0.69% of associtation polymer amount of substance；
In some embodiments that the present invention is provided, the surfactant is preferably the 0.011% of associtation polymer amount of substance；In this hair
In some embodiments of bright offer, the surfactant is preferably the 0.0098% of associtation polymer amount of substance；Carried in the present invention
In some embodiments for supplying, the surfactant is preferably the 0.15% of associtation polymer amount of substance；One provided in the present invention
In a little embodiments, the surfactant is preferably the 0.73% of associtation polymer amount of substance；In some implementations that the present invention is provided
In example, the surfactant is preferably the 0.05% of associtation polymer amount of substance；In some embodiments that the present invention is provided, institute
State the 0.12% of surfactant preferably associtation polymer amount of substance；In some embodiments that the present invention is provided, the surface
Activating agent is preferably the 0.09% of associtation polymer amount of substance；In other embodiments that the present invention is provided, the surface-active
Agent is preferably the 0.096% of associtation polymer amount of substance.
The surfactant is surfactant well known to those skilled in the art, has no special limitation, this
Petroleum sulfonate analog anion surfactants, alkyl benzene sulfonate anion surfactant, α-alkene are preferably in invention
Sulfonated hydrocarbon anionoid surfactant, betaines both sexes surfactant, alkanolamide class non-ionic surfactant, nonionic Shuangzi
Surfactant, anionic gemini surfactant, alkylnaphthalene sulfonate, lignosulfonates, vegetable oil carboxylate, oil
One or more in carboxylate, biological species surfactant and complexed surfactant.
The oil displacement system that the present invention is provided preferably also includes alkaline matter, and the quality of the alkaline matter is association polymer
The 0.09%~2.17% of quality.Now, oil displacement system is ASP ternary composite drivings, its main mechanism of oil displacement be alkali with crude oil in
Acidic components effect in-situ generation soaps, with add surfactant synergy, produce ultralow interfacial tension；Live on surface
Property agent/polymeric system in add alkali, alkali produces ion exchange with the mineral of rock surface, and rock surface mineral composition occurs
Change, improves rock particles surface electrical behavior, reduce the absorption on a rock surface of price surfactant and polymer higher,
Damage for Detention, dosage of surfactant needed for can making combination flooding is substantially reduced, cost-effective.
In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.09%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.27%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.83%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
2.17%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.12%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
1.9%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.77%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
1.57%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.15%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
2.17%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.74%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
1.8%；In some embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.1%；In other embodiments that the present invention is provided, the quality of the alkaline matter is preferably association polymer quality
0.31%.
The alkaline matter is alkaline matter well known to those skilled in the art, has no special limitation, the present invention
In be preferably NaOH, Na2CO3With one or more in amine organic base.
The present invention uses and the association polymer work that a small amount of hydrophobic grouping and function monomer are obtained is introduced on polymer molecule
It is oil displacement system, with the introducing of hydrophobic grouping, in these macromoleculars or intermolecular hydrophobic grouping is in aqueous due to dredging
Water is acted on and mutually associated, and forms reversible three dimensions dynamic physical cross-linked network, so as in lower molecular weight and low concentration
When can have viscosity and elasticity higher, cost-effective, this reversible construction has is broken and is worked as under intensive shear effect
Shear action reduces or is able to when disappearing the characteristic recovered, and solves traditional polymer viscous by the irreversible loss of Strong shear effect
The problem of degree；Molecular coil aggregation can reversible deformation, ensure the good injection of oil reservoir in the case of, due to hydrophobic monomer
Introducing, set up real high resistant force coefficient and residual resistance factor high, effectively reduce Relative High Permeability region permeability, with compared with
Good profile control effect, improvement is subsequently implanted into water sweep efficiency；Function monomer introduce and association spacial framework intensity with
Solution polarity increases and increases so that system has good heat and salinity tolerance anti-shearing and ageing stability；Can be by hydrophobic
Content of monomer, species and the change of molecular weight change molecular coil size, so as under low-molecular-weight low concentration with LOW PERMEABILITY RESERVOIR hole
Larynx matches, it is ensured that polymer injection and the conduction displacement of reservoir oil of energy deep；Having to LOW PERMEABILITY RESERVOIR preferably improve oil and water mobility ratio to make
With improvement is subsequently implanted into water sweep efficiency；Due to the presence of three dimensions dynamic physical cross-linked network in solution, system elasticity is big
Width is raised, and improves polymer microscopic oil displacement efficiency, so as to recovery ratio after the water drive for preferably improving LOW PERMEABILITY RESERVOIR；Add surface
When activating agent and alkali are configured to binary (ternary) system, while association polymer advantage is ensured, body can be increased substantially
It is the performances such as viscosity and elasticity (generation positive coopertive effect), and the surfactant and alkali of addition can increase substantially system and wash
Oily efficiency, so as to water drive and poly- drive recovery ratio can be increased substantially under the conditions of High water cut, the LOW PERMEABILITY RESERVOIR of recovery percent of reserves high.
Present invention also offers a kind of flooding method of LOW PERMEABILITY RESERVOIR, entered using the above-mentioned oil displacement system for LOW PERMEABILITY RESERVOIR
The row displacement of reservoir oil.
In order to further illustrate the present invention, what is with reference to embodiments the present invention provided is a kind of for low-permeability oil deposit
Oil displacement system and flooding method are described in detail.
Reagent used is commercially available in following examples.
1st, when oil displacement system only includes association polymer and water, its evaluation rubric standard is as follows：
1.1 prepared polymer mother liquors
Open water-bath and be warming up to demand temperature, the water that amount of calculation is weighed in beaker (need to first use 500 eye mesh screens with water filling
Filtering), and be put into water-bath, vertical stirrer is opened, suitable rotational speed is selected, the water in cup is formed whirlpool and preheated.
The polymer dry powder of amount of calculation is weighed, is uniformly sprinkled into along whirlpool wall, stirring to the mother liquor for being dissolved as required concentration.
1.2 prepare certain density target liquid
As needed, take appropriate polymer mother liquor and add the water of amount of calculation, using vertical stirrer under appropriate rotating speed
Stirring 1h, is diluted to the target liquid of required concentration.
1.3 determination of solution viscosity
From Brookfield viscosimeters, take a certain amount of polymer target solution and be fitted into Sheng sample cylinder, in required temperature
Under preheated.Appropriate rotor and rotating speed are chosen, target fluid viscosity value of obtain of being taken the mean after measure 3,5,8min viscosity numbers.
1.4 mechanical shearing retention rates
Appropriate polymer target liquid is taken, solution viscosity (viscosity before shearing) is determined.It is right under I grades using waring agitators
The solution stands froth breaking at normal temperatures after being stirred shearing 30s.Froth breaking takes clear liquid after finishing, and determines its viscosity and (is glued after shearing
Degree).Mechanical shearing retention rate is the ratio between viscosity and the preceding viscosity of shearing after shearing.
1.5 90 days aged viscosity retention rates
After the logical nitrogen of the polymer target solution for having configured of viscosity will be determined carrying out deoxygenation, packing to multiple ampoule bottles
In and high temperature sintering sealing, ampoule bottle is positioned in the baking oven of relevant temperature, every certain number of days take out one determine its viscosity,
Compare 90 days interpolymer target solution viscosity B coefficents, the ratio of solution viscosity and initial viscosity when its viscosity retention ratio is 90 days
Value.
1.6 resistance coefficients are determined with residual resistance factor
Selection has measured the natural core or artificial core of basic parameter, and puts it into core holding unit,
Plus appropriate ring pressure；Or choose and measured the fill out sand tube of basic parameter, be put into the baking oven for rise to experimental temperature plus
Heat.
Load intermediate receptacle after water used by experiment and the polymer target solution for preparing are filtered.Using precision
Pump is first with appropriate flow velocity to rock core or fill out sand tube saturation water；After saturation water is finished, continue to be filled to pressure stability P1；With with note
Water identical flow velocity injection of polymer target solution is to pressure value stabilization P2, export the viscosity stabilization of efflux；Finally again with phase
The steady P of pressure is filled to speed3。
Resistance coefficient is the ratio of P2 and P1.
Residual resistance factor is the ratio of P3 and P1.
1.7 improve recovery ratio degree
Homogeneous Reservoir oil displacement experiment can fill out sand tube, artificial homogeneous rock core and natural core using homogeneous, below with measure
As a example by artificial side's core oil-displacement test of good parameters：
Device pipeline is connected first, after setting oven temperature, saturation water operation is carried out to rock core using suitable flow rate.Treat
After saturation water terminates, saturation crude oil or simulation oil operation are carried out, collect efflux, record the profit volume of outflow, calculate hole
Gap volume and saturation oil mass；Close fill out sand tube curing certain hour immediately after saturated oils process terminates, be ready for water drive reality
Test.
When water drive is tested, rock core outlet is first opened, discharged in model from oil spout to no longer fuel-displaced, record is from oil spout
Volume, and it is deducted from saturation oil mass.By clamper outlet connection oil water separator, by constant speed pump in rock core according to
It is required that flow velocity carries out water filling, port of export efflux is collected, and pressure, the upper and lower liquid of oil water separator are recorded every certain hour
Face, effluent volume, calculate instantaneous liquid outlet quantity, instantaneous moisture content, instantaneous oil yield, recovery ratio and injection pore volume times
Number；When instantaneous moisture content reaches the poly- condition of requirement metaideophone, metaideophone gathers immediately.
During polymer flooding, stop water filling, using desired flow velocity injection of polymer, and liquid is collected in exit.Often
10min reads pressure, the upper and lower liquid level of oil water separator, an effluent volume, and record calculates instantaneous liquid outlet quantity, instantaneously contains
Water rate, instantaneous oil yield, recovery ratio and injection pore volume multiple；When noting poly-, when accumulative liquid outlet quantity reaches the poly- of requirement of experiment
During compound injection rate, sequent water flooding is turned immediately.
During sequent water flooding, stop injection of polymer, flow velocity water filling as requested collects liquid in the port of export；Read per 10min
Pressure, the upper and lower liquid level of oil water separator, an effluent volume, and record and calculate instantaneous liquid outlet quantity, instantaneous moisture content, instantaneous
Oil yield, recovery ratio and injection pore volume multiple；When displacement to oil-free output or moisture content reaches requirement, terminate experiment.
It is well mixed during certain density demulsifier is added into oil water separator, reading point after 24h is stood under experimental temperature
From the upper and lower fluid value of device, and raising recovery ratio value (now overall recovery factor subtracts early stage waterflood recovery efficiency factor) now is calculated, with reality
Raising recovery ratio at the end of testing just compares, and amendment may caused recovery ratio error due to emulsification of crude oil.
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 3mD, the performance of oil displacement system is surveyed
Test result is shown in Table 2, and the composition of polymer is shown in Table 1 in oil displacement system, and using polyacrylamide that molecular weight is 3,000,000 as comparing
Example 1.
Experimental condition：
Temperature：72℃；TDS：50000mg/L；Calcium ions and magnesium ions：8000mg/L；Viscosity of crude：100mPa.s；Rock core specification：
4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d, is carried
Recovery ratio amplitude after water drive high, continues water drive to moisture content 98% after the poly- 0.3PV of metaideophone during moisture content 98%.
The composition of polymer in the oil displacement system of table 1
The performance test results of oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 2 is 3mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 12mD, the performance of oil displacement system
Test result is shown in Table 4, and the composition of polymer is shown in Table 3 in oil displacement system, and using polyacrylamide that molecular weight is 6,000,000 as than
Compared with example 2.
Experimental condition：
Temperature：70℃；TDS：65000mg/L；Calcium ions and magnesium ions：10000mg/L；Viscosity of crude：120mPa.s；Rock core is advised
Lattice：4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d,
Recovery ratio amplitude after water drive is improved, continues water drive to moisture content 98% during moisture content 98% after the poly- 0.3PV of metaideophone.
The composition of polymer in the oil displacement system of table 3
The performance test results of oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 4 is 12mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 23mD, the performance of oil displacement system
Test result is shown in Table 6, and the composition of polymer is shown in Table 5 in oil displacement system, and using polyacrylamide that molecular weight is 8,000,000 as than
Compared with example 3.
Experimental condition：
Temperature：85℃；TDS：68000mg/L；Calcium ions and magnesium ions：8000mg/L；Viscosity of crude：150mPa.s；Rock core specification：
4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d, is carried
Recovery ratio amplitude after water drive high, continues water drive to moisture content 98% after the poly- 0.3PV of metaideophone during moisture content 98%.
The composition of polymer in the oil displacement system of table 5
The performance test results of oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 6 is 23mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 49mD, the performance of oil displacement system
Test result is shown in Table 8, and polymer composition is shown in Table 7 in oil displacement system, and using polyacrylamide that molecular weight is 10,000,000 as than
Compared with example 4.
Experimental condition：
Temperature：78℃；TDS：72000mg/L；Calcium ions and magnesium ions：15000mg/L；Viscosity of crude：200mPa.s；Rock core is advised
Lattice：4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d,
Recovery ratio amplitude after water drive is improved, continues water drive to moisture content 98% during moisture content 98% after the poly- 0.3PV of metaideophone.
The composition of polymer in the oil displacement system of table 7
The performance test results of oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 8 is 49mD
2nd, when oil displacement system include association polymer and surfactant when, as binary combination flooding when, evaluation criterion is such as
Under：
2.1 prepared polymer mother liquors
Open water-bath and be warming up to demand temperature, the water that amount of calculation is weighed in beaker (need to first use 500 eye mesh screens with water filling
Filtering), and be put into water-bath, vertical stirrer is opened, suitable rotational speed is selected, the water in cup is formed whirlpool and preheated.
The polymer dry powder of amount of calculation is weighed, is uniformly sprinkled into along whirlpool wall, stirring to the mother liquor for being dissolved as required concentration.
2.2 prepare certain density target liquid
As needed, take amount of calculation polymer mother liquor and add the corresponding species surfactant solution and water of amount of calculation,
1h is stirred under appropriate rotating speed using vertical stirrer, the binary system target liquid of required concentration is configured to.
2.3 determination of solution viscosity
From Brookfield viscosimeters, take a certain amount of binary system target solution and be fitted into Sheng sample cylinder, in required temperature
Preheated under degree.Appropriate rotor and rotating speed are chosen, target fluid viscosity of obtain of being taken the mean after measure 3,5,8min viscosity numbers
Value.
2.4 mechanical shearing retention rates
Appropriate binary system target liquid is taken, solution viscosity (viscosity before shearing) is determined.Using waring agitators under I grades
Froth breaking is stood at normal temperatures after shearing 30s is stirred to the solution.Froth breaking takes clear liquid after finishing, and determines its viscosity (after shearing
Viscosity).Mechanical shearing retention rate is the ratio between viscosity and the preceding viscosity of shearing after shearing.
2.5 90 days aged viscosity retention rates
After the logical nitrogen of the binary system target solution for having configured of viscosity (initial viscosity) will be determined carrying out deoxygenation, packing
The simultaneously high temperature sintering sealing into multiple ampoule bottles, ampoule bottle is positioned in the baking oven of relevant temperature, and one is taken out every certain number of days
Branch determines its viscosity, compares binary system target solution viscosity B coefficent in 90 days, and solution glues when its viscosity retention ratio is 90 days
The ratio of degree and initial viscosity.
2.6 resistance coefficients are determined with residual resistance factor
Selection has measured the natural core or artificial core of basic parameter, and puts it into core holding unit,
Plus appropriate ring pressure；Or choose and measured the fill out sand tube of basic parameter, be put into the baking oven for rise to experimental temperature plus
Heat.
Load intermediate receptacle after water used by experiment and the binary system target solution for preparing are filtered.Using essence
Close pump is first with appropriate flow velocity to rock core or fill out sand tube saturation water；After saturation water is finished, continue to be filled to pressure stability P1；With with
Water filling identical flow velocity injects binary system target solution to pressure value stabilization P2, export the viscosity stabilization of efflux；Again finally
The steady P of pressure is filled to identical speed3。
Resistance coefficient is the ratio of P2 and P1.
Residual resistance factor is the ratio of P3 and P1.
2.7 improve recovery ratio degree
Homogeneous Reservoir oil displacement experiment can fill out sand tube, artificial homogeneous rock core and natural core using homogeneous, below with measure
As a example by artificial side's core oil-displacement test of good parameters：
Device pipeline is connected first, after setting oven temperature, saturation water operation is carried out to rock core using suitable flow rate.Treat
After saturation water terminates, saturation crude oil or simulation oil operation are carried out, collect efflux, record the profit volume of outflow, calculate hole
Gap volume and saturation oil mass；Close fill out sand tube curing certain hour immediately after saturated oils process terminates, be ready for water drive reality
Test.
When water drive is tested, rock core outlet is first opened, discharged in model from oil spout to no longer fuel-displaced, record is from oil spout
Volume, and it is deducted from saturation oil mass.By clamper outlet connection oil water separator, by constant speed pump in rock core according to
It is required that flow velocity carries out water filling, port of export efflux is collected, and pressure, the upper and lower liquid of oil water separator are recorded every certain hour
Face, effluent volume, calculate instantaneous liquid outlet quantity, instantaneous moisture content, instantaneous oil yield, recovery ratio and injection pore volume times
Number；When instantaneous moisture content reaches the poly- condition of requirement metaideophone metaideophone binary system immediately.
During metaideophone binary system, stop water filling, binary system is injected using desired flow velocity, and in exit collection liquid
Body.Per 10min read pressure, the upper and lower liquid level of oil water separator, an effluent volume, and record calculate instantaneous liquid outlet quantity,
Instantaneous moisture content, instantaneous oil yield, recovery ratio and injection pore volume multiple；During note binary system, when accumulative liquid outlet quantity reaches
During the binary system injection rate of requirement of experiment, sequent water flooding is turned immediately.
During sequent water flooding, stop injection binary system, flow velocity water filling as requested collects liquid in the port of export；Per 10min
Read pressure, the upper and lower liquid level of oil water separator, an effluent volume, and record calculates instantaneous liquid outlet quantity, instantaneous moisture content, wink
When oil yield, recovery ratio and injection pore volume multiple；When displacement to oil-free output or moisture content reaches requirement, terminate real
Test.
It is well mixed during certain density demulsifier is added into oil water separator, reading point after 24h is stood under experimental temperature
From the upper and lower fluid value of device, and raising recovery ratio value (now overall recovery factor subtracts early stage waterflood recovery efficiency factor) now is calculated, with reality
Raising recovery ratio at the end of testing just compares, and amendment may caused recovery ratio error due to emulsification of crude oil.
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 3mD, binary combination flooding displacement of reservoir oil body
The performance test results of system are shown in Table 10, and the composition of polymer is shown in Table 9 in oil displacement system, and with polypropylene that molecular weight is 3,000,000
Acid amides is used as comparative example 5.
Experimental condition：
Temperature：72℃；TDS：50000mg/L；Calcium ions and magnesium ions：8000mg/L；Viscosity of crude：100mPa.s；Rock core specification：
4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d, is carried
Recovery ratio amplitude after water drive high, continues water drive to moisture content 98% after the poly- 0.3PV of metaideophone during moisture content 98%.
The composition of polymer in the oil displacement system of table 9
The performance test results of binary combination flooding oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 10 is 3mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 12mD, the binary combination flooding displacement of reservoir oil
The performance test results of system are shown in Table 12, and the composition of polymer is shown in Table 11 in oil displacement system, and so that molecular weight is 6,000,000 poly- third
Acrylamide is used as comparative example 6.
Experimental condition：
Temperature：70℃；TDS：65000mg/L；Calcium ions and magnesium ions：10000mg/L；Viscosity of crude：120mPa.s；Rock core is advised
Lattice：4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d,
Recovery ratio amplitude after water drive is improved, continues water drive to moisture content 98% during moisture content 98% after the poly- 0.3PV of metaideophone.
The composition of polymer in the oil displacement system of table 11
The performance test results of binary combination flooding oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 12 is 12mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 23mD, the binary combination flooding displacement of reservoir oil
The performance test results of system are shown in Table 14, and the composition of polymer is shown in Table 13 in oil displacement system, and so that molecular weight is 8,000,000 poly- third
Acrylamide is used as comparative example 7.
Experimental condition：
Temperature：85℃；TDS：68000mg/L；Calcium ions and magnesium ions：8000mg/L；Viscosity of crude：150mPa.s；Rock core specification：
4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d, is carried
Recovery ratio amplitude after water drive high, continues water drive to moisture content 98% after the poly- 0.3PV of metaideophone during moisture content 98%.
The composition of polymer in the oil displacement system of table 13
The performance test results of binary combination flooding oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 14 is 23mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 49mD, the binary combination flooding displacement of reservoir oil
The performance test results of system are shown in Table 16, and the composition of polymer is shown in Table 15 in oil displacement system, and with molecular weight be 10,000,000 it is poly-
Acrylamide is used as comparative example 8.
Experimental condition：
Temperature：78℃；TDS：72000mg/L；Calcium ions and magnesium ions：15000mg/L；Viscosity of crude：200mPa.s；Rock core is advised
Lattice：4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d,
Recovery ratio amplitude after water drive is improved, continues water drive to moisture content 98% during moisture content 98% after the poly- 0.3PV of metaideophone.
The composition of polymer in the oil displacement system of table 15
The performance test results of binary combination flooding oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 16 is 49mD
3rd, when oil displacement system include association polymer, surfactant and alkaline matter when, as ternary composite driving when, comment
Price card is accurate as follows：
3.1 prepared polymer mother liquors
Open water-bath and be warming up to demand temperature, the water that amount of calculation is weighed in beaker (need to first use 500 eye mesh screens with water filling
Filtering), and be put into water-bath, vertical stirrer is opened, suitable rotational speed is selected, the water in cup is formed whirlpool and preheated.
The polymer dry powder of amount of calculation is weighed, is uniformly sprinkled into along whirlpool wall, stirring to the mother liquor for being dissolved as required concentration.
3.2 prepare certain density target liquid
As needed, take amount of calculation polymer mother liquor and add corresponding species surfactant and the mixing of alkali of amount of calculation
The water of solution, amount of calculation, 1h is stirred using vertical stirrer under appropriate rotating speed, is configured to the ternary system target of required concentration
Liquid.
3.3 determination of solution viscosity
From Brookfield viscosimeters, take a certain amount of ternary system target solution and be fitted into Sheng sample cylinder, in required temperature
Preheated under degree.Appropriate rotor and rotating speed are chosen, target fluid viscosity of obtain of being taken the mean after measure 3,5,8min viscosity numbers
Value.
3.4 mechanical shearing retention rates
Appropriate ternary system target liquid is taken, solution viscosity (viscosity before shearing) is determined.Using waring agitators under I grades
Froth breaking is stood at normal temperatures after shearing 30s is stirred to the solution.Froth breaking takes clear liquid after finishing, and determines its viscosity (after shearing
Viscosity).Mechanical shearing retention rate is the ratio between viscosity and the preceding viscosity of shearing after shearing.
3.5 90 days aged viscosity retention rates
After the logical nitrogen of the ternary system target solution for having configured of viscosity (initial viscosity) will be determined carrying out deoxygenation, packing
The simultaneously high temperature sintering sealing into multiple ampoule bottles, ampoule bottle is positioned in the baking oven of relevant temperature, and one is taken out every certain number of days
Branch determines its viscosity, compares ternary system target solution viscosity B coefficent in 90 days, and solution glues when its viscosity retention ratio is 90 days
The ratio of degree and initial viscosity.
3.6 resistance coefficients are determined with residual resistance factor
Selection has measured the artificial core or natural core of basic parameter, and puts it into core holding unit,
Plus appropriate ring pressure；Or choose and measured the fill out sand tube of basic parameter, be put into the baking oven for rise to experimental temperature plus
Heat.
Load intermediate receptacle after water used by experiment and the ternary system target solution for preparing are filtered.Using essence
Close pump is first with appropriate flow velocity to rock core or fill out sand tube saturation water；After saturation water is finished, continue to be filled to pressure stability P1；With with
Water filling identical flow velocity injects ternary system target solution to pressure value stabilization P2, export the viscosity stabilization of efflux；Again finally
The steady P of pressure is filled to identical speed3。
Resistance coefficient is the ratio of P2 and P1.
Residual resistance factor is the ratio of P3 and P1.
3.7 improve recovery ratio degree
Homogeneous Reservoir oil displacement experiment can fill out sand tube, artificial homogeneous rock core and natural core using homogeneous, below with measure
As a example by artificial side's core oil-displacement test of good parameters：
Device pipeline is connected first, after setting oven temperature, saturation water operation is carried out to rock core using suitable flow rate.Treat
After saturation water terminates, saturation crude oil or simulation oil operation are carried out, collect efflux, record the profit volume of outflow, calculate hole
Gap volume and saturation oil mass；Close fill out sand tube curing certain hour immediately after saturated oils process terminates, be ready for water drive reality
Test.
When water drive is tested, rock core outlet is first opened, discharged in model from oil spout to no longer fuel-displaced, record is from oil spout
Volume, and it is deducted from saturation oil mass.By clamper outlet connection oil water separator, by constant speed pump in rock core according to
It is required that flow velocity carries out water filling, port of export efflux is collected, and pressure, the upper and lower liquid of oil water separator are recorded every certain hour
Face, effluent volume, calculate instantaneous liquid outlet quantity, instantaneous moisture content, instantaneous oil yield, recovery ratio and injection pore volume times
Number；When instantaneous moisture content reaches the poly- condition of requirement metaideophone metaideophone ternary system immediately.
During metaideophone ternary system, stop water filling, ternary system is injected using desired flow velocity, and in exit collection liquid
Body.Per 10min read pressure, the upper and lower liquid level of oil water separator, an effluent volume, and record calculate instantaneous liquid outlet quantity,
Instantaneous moisture content, instantaneous oil yield, recovery ratio and injection pore volume multiple；During note ternary system, when accumulative liquid outlet quantity reaches
During the ternary system injection rate of requirement of experiment, sequent water flooding is turned immediately.
During sequent water flooding, stop injection ternary system, flow velocity water filling as requested collects liquid in the port of export；Per 10min
Read pressure, the upper and lower liquid level of oil water separator, an effluent volume, and record calculates instantaneous liquid outlet quantity, instantaneous moisture content, wink
When oil yield, recovery ratio and injection pore volume multiple；When displacement to oil-free output or moisture content reaches requirement, terminate real
Test.
It is well mixed during certain density demulsifier is added into oil water separator, reading point after 24h is stood under experimental temperature
From the upper and lower fluid value of device, and raising recovery ratio value (now overall recovery factor subtracts early stage waterflood recovery efficiency factor) now is calculated, with reality
Raising recovery ratio at the end of testing just compares, and amendment may caused recovery ratio error due to emulsification of crude oil.
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 3mD, ternary built composite reservoir oil displacement body
The performance test results of system are shown in Table 18, and the composition of oil displacement system is shown in Table 17, and using polyacrylamide that molecular weight is 3,000,000 as
Comparative example 9, solution concentration is 3500mg/L.
Experimental condition：
Temperature：72℃；TDS：50000mg/L；Calcium ions and magnesium ions：8000mg/L；Viscosity of crude：100mPa.s；Rock core specification：
4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d, is carried
Recovery ratio amplitude after water drive high, continues water drive to moisture content 98% after the poly- 0.3PV of metaideophone during moisture content 98%.
The composition of the oil displacement system of table 17
The performance test results of ternary built composite reservoir oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 18 is 3mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 12mD, ternary built composite reservoir oil displacement
The performance test results of system are shown in Table 20, and the composition of oil displacement system is shown in Table 19, and is made with the polyacrylamide that molecular weight is 6,000,000
It is comparative example 10, solution concentration is 3500mg/L.
Experimental condition：
Temperature：70℃；TDS：65000mg/L；Calcium ions and magnesium ions：10000mg/L；Viscosity of crude：120mPa.s；Rock core is advised
Lattice：4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d,
Recovery ratio amplitude after water drive is improved, continues water drive to moisture content 98% during moisture content 98% after the poly- 0.3PV of metaideophone.
The composition of the oil displacement system of table 19
The performance test results of ternary built composite reservoir oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 20 is 12mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 23mD, ternary built composite reservoir oil displacement
The performance test results of system are shown in Table 22, and the composition of oil displacement system is shown in Table 21, and is made with the polyacrylamide that molecular weight is 8,000,000
It is comparative example 11, solution concentration is 3300mg/L.
Experimental condition：
Temperature：85℃；TDS：68000mg/L；Calcium ions and magnesium ions：8000mg/L；Viscosity of crude：150mPa.s；Rock core specification：
4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d, is carried
Recovery ratio amplitude after water drive high, continues water drive to moisture content 98% after the poly- 0.3PV of metaideophone during moisture content 98%.
The composition of the oil displacement system of table 21
The performance test results of ternary built composite reservoir oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 22 is 23mD
Oil displacement system is evaluated according to this standard, when obtaining evaluating LOW PERMEABILITY RESERVOIR permeability for 49mD, ternary built composite reservoir oil displacement
The performance test results of system are shown in Table 24, and the composition of oil displacement system is shown in Table 23, and with polyacrylamide that molecular weight is 10,000,000
Used as comparative example 12, solution concentration is 3500mg/L.
Experimental condition：
Temperature：78℃；TDS：72000mg/L；Calcium ions and magnesium ions：15000mg/L；Viscosity of crude：200mPa.s；Rock core is advised
Lattice：4.5 × 4.5 × 30cm artificial cores；The resistance coefficient RF of system, residual resistance factor RRF are measured under injection rate 3m/d,
Recovery ratio amplitude after water drive is improved, continues water drive to moisture content 98% during moisture content 98% after the poly- 0.3PV of metaideophone.
The composition of the oil displacement system of table 23
The performance test results of ternary built composite reservoir oil displacement system when the LOW PERMEABILITY RESERVOIR permeability of table 24 is 49mD
Claims (9)
1. a kind of oil displacement system for LOW PERMEABILITY RESERVOIR, it is characterised in that including association polymer；The association polymer point
Son amount is 101.4~997.5 ten thousand；In mole percent, the association polymer is by acrylamide, 0.09%~10.2%
Function monomer of the hydrophobic monomer with 0~15.4% is polymerized and obtains；In the oil displacement system concentration of association polymer be 200~
3500mg/L；
The hydrophobic monomer is selected from N- alkyl-substituted acrylamides and its derivative, alkyl acrylate, methacrylate
Ester, the alkyl acrylate of fluorine substitution, alkyl methacrylate, allyl alkyl quaternary ammonium salt, the acrylamide alkane of fluorine substitution
One or more in base sulfonic acid and its sulfonate, alkylphenol-polyethenoxy acrylate and acrylic acid polyxyethylated ester；
The function monomer is selected from sulfonic acid and its sulfonate derivatives containing end alkenyl and the heterocycle containing end alkenyl
One or more in derivative.
2. oil displacement system according to claim 1, it is characterised in that the N- alkyl-substituted acrylamides and its derivative
Thing, alkyl acrylate, alkyl methacrylate, allyl alkyl quaternary ammonium salt, acrylic acid alkyl sulfonic acid and its sulfonate, alkane
The methyl of base phenol polyethenoxy acrylate, acrylic acid polyxyethylated ester, the alkyl acrylate of fluorine substitution and fluorine substitution
The carbon number of alkyl is each independently 4~40 in alkyl acrylate.
3. oil displacement system according to claim 1, it is characterised in that the function monomer is selected from 2- acrylamidos -2-
Methyl propane sulfonic acid and its sulfonate, vinyl sulfonic acid and its sulfonate, styrene sulfonic acid and its sulfonate and N- vinyl -2-
One or more in pyrrolidones.
4. oil displacement system according to claim 1, it is characterised in that also including surfactant；The surfactant
Quality for associtation polymer amount of substance 0.001%~0.73%.
5. oil displacement system according to claim 4, it is characterised in that the surfactant be petroleum-sulfonate it is cloudy from
Sub- surfactant, alkyl benzene sulfonate anion surfactant, alpha-alkene sulfonate anionoid surfactant, glycine betaine
Class both sexes surfactant, alkanolamide class non-ionic surfactant, non-ionic gemini surface active agent, anionic Shuangzi surface are lived
Property agent, alkylnaphthalene sulfonate, lignosulfonates, vegetable oil carboxylate, petroleum carboxylate, biological species surfactant with it is compound
One or more in surfactant.
6. oil displacement system according to claim 4, it is characterised in that also including alkaline matter；The matter of the alkaline matter
Measure is the 0.09%~2.17% of associtation polymer amount of substance.
7. oil displacement system according to claim 6, it is characterised in that the alkaline matter is NaOH, Na2CO3Have with amine
One or more in machine alkali.
8. oil displacement system according to claim 1, it is characterised in that it is a, 3mD that the water of the LOW PERMEABILITY RESERVOIR surveys permeability
≤ a ＜ 50mD.
9. a kind of flooding method of LOW PERMEABILITY RESERVOIR, it is characterised in that using described in claim 1~8 any one for low
The oil displacement system that permeability is hidden carries out the displacement of reservoir oil.
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| CN109135710A (en) * | 2018-10-09 | 2019-01-04 | 西南石油大学 | The identical association polymer compound oil displacement agent of monomer charge and single hop plug flooding method |
| CN112592699A (en) * | 2021-01-27 | 2021-04-02 | 陕西延长石油（集团）有限责任公司 | Low-damage drilling fluid suitable for ultra-low permeability reservoir and preparation method thereof |
| CN112943192A (en) * | 2021-02-03 | 2021-06-11 | 中国石油天然气股份有限公司 | Mining method suitable for low-permeability conglomerate oil reservoir |
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