WO2024125751A1 - Procédé d'extraction de pétrole - Google Patents
Procédé d'extraction de pétrole Download PDFInfo
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- WO2024125751A1 WO2024125751A1 PCT/EA2023/050009 EA2023050009W WO2024125751A1 WO 2024125751 A1 WO2024125751 A1 WO 2024125751A1 EA 2023050009 W EA2023050009 W EA 2023050009W WO 2024125751 A1 WO2024125751 A1 WO 2024125751A1
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- Prior art keywords
- slug
- formation
- surfactant
- oil
- polymer
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000011084 recovery Methods 0.000 title abstract description 10
- 239000004094 surface-active agent Substances 0.000 claims abstract description 78
- 229920000642 polymer Polymers 0.000 claims abstract description 72
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003112 inhibitor Substances 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims description 53
- 239000007924 injection Substances 0.000 claims description 53
- 239000000243 solution Substances 0.000 claims description 48
- 239000003513 alkali Substances 0.000 claims description 27
- 239000011148 porous material Substances 0.000 claims description 27
- 238000001179 sorption measurement Methods 0.000 claims description 27
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 9
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 229920002401 polyacrylamide Polymers 0.000 description 27
- 241000237858 Gastropoda Species 0.000 description 15
- 239000000126 substance Substances 0.000 description 13
- 239000011435 rock Substances 0.000 description 12
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 11
- 230000007062 hydrolysis Effects 0.000 description 11
- 238000006460 hydrolysis reaction Methods 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 9
- 239000003945 anionic surfactant Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000002736 nonionic surfactant Substances 0.000 description 6
- -1 carbonate anions Chemical class 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 239000006184 cosolvent Substances 0.000 description 5
- 239000008398 formation water Substances 0.000 description 5
- 150000003871 sulfonates Chemical class 0.000 description 5
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011162 core material Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000004711 α-olefin Substances 0.000 description 4
- ABUFMGLVKVVDFW-UHFFFAOYSA-N 2-methylpropane-2-sulfonic acid;prop-2-enamide Chemical compound NC(=O)C=C.CC(C)(C)S(O)(=O)=O ABUFMGLVKVVDFW-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- 150000007942 carboxylates Chemical class 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- ZHCGVAXFRLLEFW-UHFFFAOYSA-N 2-methyl-3-(prop-2-enoylamino)propane-1-sulfonic acid Chemical class OS(=O)(=O)CC(C)CNC(=O)C=C ZHCGVAXFRLLEFW-UHFFFAOYSA-N 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 229920001222 biopolymer Polymers 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920001038 ethylene copolymer Polymers 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004034 viscosity adjusting agent Substances 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- GGQQNYXPYWCUHG-RMTFUQJTSA-N (3e,6e)-deca-3,6-diene Chemical compound CCC\C=C\C\C=C\CC GGQQNYXPYWCUHG-RMTFUQJTSA-N 0.000 description 1
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical class CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 1
- YPFUJZAAZJXMIP-UHFFFAOYSA-N 3-sulfopropanediol Chemical compound OCC(O)CS(O)(=O)=O YPFUJZAAZJXMIP-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical class C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 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 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical class CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical class OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002169 ethanolamines Chemical class 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical class [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 235000012254 magnesium hydroxide Nutrition 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Definitions
- the invention relates to the oil production industry, in particular, to methods of oil production using tertiary methods, namely, to chemical methods for increasing oil recovery, and can be used to produce residual oil in fields at the third and fourth stages of development.
- CMOR enhanced oil recovery
- a preliminary slug (pre-skin) into the formation in front of the main slug, which is a solution of a surfactant-polymer composition.
- a method for developing oil deposits is known from the prior art (RF Patent No. 2592005, published July 20, 2016), which involves pumping into the formation through an injection well a composition in the form of an aqueous solution of a surfactant, an alkaline agent (inorganic alkali) and a polymer.
- a slug of low-mineralized water is preliminarily pumped into the injection well, and the volume of this slug is calculated depending on the initial salinity of water in the formation.
- the mentioned composition is pumped in, in which nonionic and anionic surfactants are used as surfactants, then a slug of a polymer solution with a viscosity equal to the viscosity of reservoir oil is pumped in an amount from 0.3 to 0.6 pore volumes, after which they switch to conventional flooding.
- a significant drawback of the known technical solution is the composition of the slug, which is low-mineralized water, which is pumped when implementing the method in front of the composition slug in the form of a solution of a surfactant, an alkaline agent and a polymer, since the injection of this slug leads to swelling of the clays, after which the contact area of the surfactant and charged substances increases clay particles, which ultimately leads to an increase in the adsorption of surfactants and, accordingly, to their high losses.
- low-mineralized water as a preliminary slug leads to accelerated clogging of the formation, loss of injectivity, and a decrease in the coverage of the formation by chemical flooding, since the initial salinity of the formation water is the highest compared to the injected low-mineralized water.
- the listed undesirable effects that appear due to the use of low-mineralized water in front of the composition rim in the form of a solution of a surfactant, an alkaline agent and a polymer lead to a decrease in the efficiency of oil production, in particular, to a decrease in sweep and displacement coefficients.
- a significant disadvantage of the known method is the high losses of surfactants caused by the injection of a polymer solution (PAA) as a preliminary slug, during which a redistribution of flows occurs, the so-called leveling of the injectivity profile, which allows reducing the losses of subsequently injected reagents, in particular surfactants, only in highly permeable and washed channels, while due to the large size of the polymer molecules (PAA), adsorption in low-permeability channels is not fully inhibited.
- PAA polymer solution
- the polymer when adsorbed, can partially reduce the adsorption of surfactants, but only with a significant volume of the rim, while shielding residual oil in pinched pores and pore traps, and the polymer adsorbed on the rock does not allow the surfactant to mobilize residual oil, which ultimately leads to low displacement coefficient (K out ).
- this method is characterized by low efficiency of oil production during surfactant-polymer flooding.
- a significant disadvantage of the method is the use of non-surfactants in surfactant-polymer rims, which does not allow to significantly reduce the interfacial tension when implementing the method, which also leads to a low displacement coefficient (K ext ).
- a common disadvantage of the technical solutions described above is the high losses of surfactants when implementing the surfactant-polymer flooding method, due to the unreasonable composition and volume of the slug injected into the formation in front of the main slug.
- a common disadvantage of the above methods, in which inorganic alkali is used at different stages of oil production, is the need for additional water preparation for its softening (removal of hardness cations) and stabilization.
- intensive salt deposition occurs inside the surface equipment, pipelines, bottomhole formation zone and interwell space, including due to geological heterogeneity along the lateral and section, which leads to a decrease in injectivity , failure of submersible pumps, including electric centrifugal pumps, and an increase in the frequency of well repairs.
- the objective of the present invention is to create a method of oil production that ensures the effective involvement of residual oil reserves into development with reduced surfactant consumption.
- the technical result of the invention is to increase the efficiency of using surfactants during surfactant-polymer flooding of the formation, which is expressed in the form of additional oil production per unit mass of the surfactant injected into the formation, and to reduce non-target losses of the surfactant.
- the injection well and at least one production well are in hydrodynamic communication.
- the injection well and at least one production well may be located in the same area of the field.
- oil production can be carried out through at least one production well adjacent to the injection well.
- the first rim can be prepared by mixing a surfactant and organic alkali with a pre-prepared polymer solution.
- the polymer content in the first fringe can be set in the range from 0.05 to 0.25 wt.% of the total mass of the first fringe.
- sodium lignosulfonate can be used as a surfactant in the first slug.
- monoethanolamine, diethanolamine or triethanolamine can be used as an organic alkali in the first slug.
- the second slug can be injected into the formation in an amount from 0.3 to 0.5 parts of the pore volume.
- the third slug can be injected into the formation in an amount from 0.5 to 1 fraction of the pore volume.
- the first fringe (pre-fringe) is pumped into the formation in an amount from 0.05 to 0.2 parts of the pore volume, which is a polymer solution with an adsorption inhibitor, for which a mixture of surfactants is used in an amount of 0. 25 to 0.5 wt. % of the total mass of the first slug and organic alkali in an amount from 0.25 to 2 wt. % of the total mass of the first slug.
- the first slug is pumped into the formation in order to prepare the bottom-hole zone and inter-well space, passivate the formation rock, shield the rock clays, which subsequently leads to a decrease in the adsorption of reagents, in particular surfactants, when injecting the second (main) slug, which is a solution of a surfactant-polymer composition.
- the polymer solution in the first slug simultaneously serves as a viscosity modifier, allowing uniform injection of an adsorption inhibitor, which is a mixture of surfactants and organic alkali, and evenly distributing their flows, and is also an agent for leveling the injectivity profile, reducing the volume of injection of subsequent reagents into flushed and highly permeable channels.
- an adsorption inhibitor which is a mixture of surfactants and organic alkali
- Any water-soluble high-molecular substance known from the prior art that can equalize the mobility coefficients of oil and the aqueous phase and increase the viscosity of water can be used as a polymer in the first rim, including: polyacrylamides or partially hydrolyzed polyacrylamides or copolymers of acrylamide, acrylic acid, 2-acrylamidomethylpropanesulfonates and n-vinylpyrrolidone in any ratio, polyacrylates, ethylene copolymers, biopolymers, carboxymethylcellulose, polyvinyl alcohols and others.
- a partially hydrolyzed polyacrylamide in particular a copolymer of tert-butylsulfonic acid acrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt, can be used as a polymer solution in the first rim. %.
- the polymer content in the first slug varies from 0.05 to 0.25 wt.% of the total mass of the slug, which is explained by the achievement of a sufficient level of viscosity to equalize the mobility coefficients of oil and aqueous phase, which, in turn, further enhances the achievement of the technical result.
- An adsorption inhibitor which is a mixture of a surfactant and an organic alkali, in the context of the present invention should be understood as a mixture of substances with surfactant properties and substances with basic or alkaline properties.
- the adsorption inhibitor due to the adsorption inhibitor, preliminary inactivation of adsorption points is ensured before the introduction of the second (main) slug, which is a solution of a surfactant-polymer composition.
- the use of an adsorption inhibitor as part of the first slug (pre-skin) is important to achieve the stated technical result.
- the content of the adsorption inhibitor in the first slug can vary from 0.5 to 2.5 wt.%, which is explained by a sufficient increase in the pH relative to the formation water and a sufficient surfactant content to passivate the rock away from the bottomhole zone of the formation.
- a distinctive feature of the proposed method is that a mixture of surfactant and organic alkali is used as an adsorption inhibitor in the first slug, which allows for preliminary inactivation of adsorption points before introducing the second (main) slug.
- a mixture of surfactants in an amount of 0.25 to 0.5 wt. can be used as an adsorption inhibitor. % of the total mass of the first slug and organic alkali in an amount from 0.25 to 2 wt. % of the total mass of the first slug. This is due to the fact that with such a combination, the required pH level and sufficient surfactant concentration are achieved for their adsorption on the rock, which, in turn, further enhances the achievement of the technical result. When the surfactant content is less than 0.25 wt. % of the total mass of the first slug and organic alkali is less than 0.25 wt.
- sodium lignosulfonate is used as a surfactant in the first slug, which, in turn, also ensures the achievement of the technical result. This is explained by the fact that sodium lignosulfonate is, on the one hand, a substance with pronounced surface-active properties, on the other hand, its molecules are large enough to inactivate the active centers of the formation rock.
- Formation waters of oil fields contain hardness cations, such as calcium, barium, strontium and magnesium, as well as bicarbonate and carbonate anions, and when mixed with such formation water, aqueous solutions containing an excess of inorganic alkali, for example, sodium carbonate or its hydroxide, there is an increase in the pH value, a decrease in water stability, precipitation first of calcium carbonates, then, with an increase in pH, magnesium hydroxides and other insoluble salts and compounds of hardness cations, which leads to intense salt deposition inside surface equipment, pipelines, the bottomhole zone of the formation and interwell space.
- hardness cations such as calcium, barium, strontium and magnesium, as well as bicarbonate and carbonate anions
- organic alkali is used in the composition of the first slug, so, in one embodiment of the invention, ethanolamines are used as organic alkalis, in particular monoethanolamine or diethanolamine or triethanolamine, which is explained by the fact that monoethanolamine or diethanolamine or triethanolamine are highly soluble organic substances with basic properties, which, in turn, further enhances the achievement of the technical result.
- organic alkalis monoethanolamine or diethanolamine or triethanolamine in the first slug does not imply an increase in the pH value, which, in turn, results in intense precipitation of salts or a decrease in water stability.
- the volume of the first fringe can be from 0.05 to 0.2 parts of the pore volume, which, in turn, also ensures the achievement of the technical result.
- the given volume is due to the fact that the first slug should have a smaller volume than the second (main) slug, since the mobilization of residual oil occurs precisely by injecting the second (main) slug, which is a solution of a surfactant-polymer composition.
- the volume of the first slug is less than 0.05 of the pore volume, sufficient propagation of such a slug from the injection well deep into the interwell space is not ensured, and injection of more than 0.2 of the pore volume is not advisable.
- the corresponding surfactant and organic alkali are mixed with a pre-prepared polymer solution.
- the importance of correct preparation of the first slug is due to the fact that when preparing a polymer solution in water that already contains a surfactant, intense foaming occurs during mixing, which can lead to the failure of mixing and other equipment, and will also lead to difficulty injecting the first slug into the formation.
- a second slug which is a solution of a surfactant-polymer composition
- the second slug is injected into the formation in order to mobilize residual oil and transport it from the injection well to the production well, while the surfactant mixture mobilizes the residual oil, washing it from the walls of pores and channels, including in pinched pores and trap pores. Oil mobilization occurs due to a decrease in interfacial tension at the interface between water and oil, so the surfactant mixture is selected based on the ability to achieve the required value.
- An individual anionic surfactant or a mixture of anionic and nonionic surfactants which are sulfonates, sulfates, carboxylates, phosphates of compounds based on alpha-olefins, internal olefins, benzenesulfonate compounds with a branched alkyl chain, can be used as an anionic surfactant in the second rim.
- the content of the surfactant mixture in the second slug can vary from 0.3 to 1 wt.%. In one of the variants of using the method, the content of anionic surfactant is 0.5 wt.%, since at this concentration the optimal interfacial tension and solubilization coefficient are achieved.
- a solution of a surfactant-polymer composition containing a mixture of a nonionic surfactant, an anionic surfactant, and a cosolvent in a concentration of 0.3 to 0.6 wt. can be used as a second rim. % based on the active substance, and partially hydrolyzed polyacrylamide.
- the co-solvent in the composition of the second rim acts as an agent that increases the solubility and stability of the surfactant mixture; in particular, it lowers the freezing point of the surfactant mixture.
- Ethanol, butanol, isobutanol and propanol, as well as their derivatives, can be used as a co-solvent according to the invention.
- Partially hydrolyzed polyacrylamide in the second slug acts as a viscosity modifier and an agent that equalizes the mobility of oil and the injected aqueous solution. It can be represented by partially hydrolyzed sulfonated polyacrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt. %, with a concentration of 0.15 wt.%. The content of partially hydrolyzed polyacrylamide in the second slug can vary from 0.05 to 0.25%.
- the second slug is injected into the formation in an amount of 0.3 to 0.5 percent of the pore volume, which is sufficient volume to mobilize residual oil in the formation.
- a third slug which is a polymer solution, is pumped into the formation through the same injection well.
- the third slug is injected into the formation for the purpose of efficient transport of the first (preliminary) and second (main) slugs and their uniform advancement from the injection well to the production well, which are in hydrodynamic communication.
- the volume of the third slug that is injected into the formation may be from 0.5 to 1 fraction of the pore volume. The specified volume is sufficient for efficient transport of the first slug and the second slug towards the production well.
- Any water-soluble high-molecular substance known from the prior art can be used as a polymer in the third rim, including: polyacrylamides or partially hydrolyzed polyacrylamides or copolymers of acrylamide, acrylic acid, 2-acrylamidomethylpropanesulfonates and n-vinylpyrrolidone in any ratio, polyacrylates, ethylene copolymers, biopolymers, carboxymethylcelluloses, polyvinyl alcohols and others.
- a partially hydrolyzed polyacrylamide in particular a copolymer of tert-butylsulfonic acid acrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt, can be used as a polymer solution in the third rim. %.
- the content of partially hydrolyzed polyacrylamide in the third rim can vary from 0.05 wt.% to 0.25 wt. %.
- water is pumped into the formation through the same injection well and then oil is produced through at least one production well, and the duration of production is determined depending on the profitability of the well.
- formation water or water from the reservoir pressure maintenance system can be used. Water injection ensures transport of previously injected slugs and their uniform advancement from the injection well to the production well.
- the volume of injected water is regulated by the geological and physical characteristics of the formation of a particular field and the need for additional displacement of oil and pre-injected rims.
- three slugs of a given composition and water are sequentially injected into the formation through an injection well, after which oil is produced through one or more production wells.
- injection of slugs and water into the formation can be carried out both in a continuous mode and with maintenance of technological pauses.
- Example 1 Simulation of the method of oil production according to the proposed invention in laboratory conditions.
- the proposed method was tested on a bulk reservoir model prepared from crushed core material taken from the Kholmogory field, characterized by the following set of geological and physical characteristics: the oil content of the field is associated with chalk deposits, the initial oil reserves are 70 million tons, the target terrigenous object located on the fourth development phase, lies at a depth of 2432 m, the type of deposit of the field is strata-vault, the type of reservoir corresponds to terrigenous.
- the first slug was pumped into the bulk model in the amount of 0.2 parts of the pore volume, which is a polymer solution with an adsorption inhibitor, which was used as a mixture of surfactants, in particular, sodium lignosulfonate, in an amount of 0.25 wt. % of the total mass of the first slug and organic alkali, in particular monoethanolamine, in an amount of 0.25% of the total mass of the first slug.
- the polymer used was partially hydrolyzed polyacrylamide, in particular a copolymer of tert-butylsulfonic acid acrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt%.
- the polymer content in the first slug was 0.25 wt.% of the total mass of the first slug.
- the first slug was prepared by mixing sodium lignosulfonate and monoethanolamine with a pre-prepared polymer solution of partially hydrolyzed sulfonated polyacrylamide.
- the second rim was pumped into the bulk reservoir model, which was a solution of a surfactant-polymer composition containing a mixture of a nonionic surfactant in an amount of 0.3 wt.%, an anionic surfactant, in particular a mixture of sodium alkylbenzene sulfonates and sodium salts of alpha olefin sulfonates, in an amount of 0.5 wt.%, co-solvent, in particular 2-(2-butoxyethoxy)-ethanol, in an amount of 0.3 wt. % in terms of active substance and 0.15 wt.
- a surfactant-polymer composition containing a mixture of a nonionic surfactant in an amount of 0.3 wt.%, an anionic surfactant, in particular a mixture of sodium alkylbenzene sulfonates and sodium salts of alpha olefin sulfonates, in an amount of 0.5 wt.%, co-solvent
- a third slug which is a polymer solution
- a third slug was pumped into the bulk reservoir model, in particular a solution of partially hydrolyzed sulfonated polyacrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt. .%.
- the polymer content in the third rim was 0.25 wt. % of the total mass of the selvedge.
- the size of the third rim was 1 fraction of the pore volume.
- water was pumped into the bulk model for filtration in order to simulate the process of oil displacement (oil production) in field conditions. Filtration was carried out at a constant filtration rate of 250 ⁇ l/min, with an injection volume of 3.0 units. pore volume. After that, oil was sampled from the bulk reservoir model through core material and the amount of oil at the outlet and the concentration of surfactants from the second slug in the resulting filtrate were measured.
- a comparative experiment was also presented, the conditions of which coincided with the conditions described above.
- the difference was in the composition of the first rim, namely, a polymer solution was used as the first rim, in particular, partially hydrolyzed sulfonated polyacrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt.%.
- oil was withdrawn from the bulk reservoir model through core material. Measurements were made of the amount of oil at the outlet and the concentration of surfactants from the second slug in the resulting filtrate. The results obtained were used to construct a graph reflecting the dependence of the ratio of the concentration of the extracted surfactant from the second slug to its initial concentration on the pumped volume of the slugs ( , curve 1).
- Example 2 Testing of the method according to the invention in field conditions at the Kholmogory field, characterized by a set of geological and physical characteristics described above.
- the first slug was injected into the formation through an injection well in the amount of 0.05 of the pore volume, which is a polymer solution with an adsorption inhibitor, for which a mixture of surfactants was used, in particular, sodium lignosulfonate, in an amount of 0. 5 wt. % of the total mass of the first slug and organic alkali, in particular monoethanolamine, in an amount of 2 wt. % of the total mass of the first slug.
- the pore volume which is a polymer solution with an adsorption inhibitor, for which a mixture of surfactants was used, in particular, sodium lignosulfonate
- organic alkali in particular monoethanolamine
- the polymer used was partially hydrolyzed sulfonated polyacrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5-10 wt%.
- the polymer content in the first slug was 0.05 wt.% of the total weight of the first slug.
- the first slug was prepared by mixing sodium lignosulfonate and monoethanolamine with a pre-prepared polymer solution of partially hydrolyzed sulfonated polyacrylamide.
- a second slug was injected into the formation through the same injection well, which was a solution of a surfactant-polymer composition containing a mixture of nonionic surfactant in an amount of 0.3 wt.%, anionic surfactant, in particular a mixture of sodium and sodium alkylbenzene sulfonates salts of alpha-olefin sulfonates, in an amount of 0.5 wt.%, co-solvent, in particular 2-(2-butoxyethoxy)-ethanol, in an amount of 0.3 wt. % in terms of active substance and 0.15 wt.
- anionic surfactant in particular a mixture of sodium and sodium alkylbenzene sulfonates salts of alpha-olefin sulfonates
- co-solvent in particular 2-(2-butoxyethoxy)-ethanol
- a third slug was injected into the formation through the same injection well, which was a polymer solution, in particular a solution of partially hydrolyzed sulfonated polyacrylamide with a molecular weight of 6-8 MDa, a degree of hydrolysis of 20-38% and a sulfonic acid content of 5 -10 wt.%.
- the polymer content in the third rim was 0.25 wt. % of the total mass of the selvedge.
- the size of the third slug was 0.5 of the pore volume.
- water was injected into the formation through the same injection well, after which oil was produced through production wells that were in hydrodynamic connection with the injection wells.
- the experimental studies described in the examples confirm the industrial applicability of the claimed invention.
- the data presented indicate that the proposed method ensures the achievement of a technical result, which consists in increasing the efficiency of surfactant use during surfactant-polymer flooding of the formation, which is expressed in the form of additional oil production per unit mass of surfactant injected into the formation, and reducing non-target surfactant losses.
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Abstract
L'invention se rapporte à l'industrie d'extraction du pétrole, notamment à des procédés d'extraction de pétrole selon des procédés de récupération assistée, et peut être utilisée pour extraire du pétrole dans des gisements aux troisième et quatrième stades de développement. Le résultat technique de l'invention consiste en une augmentation de l'utilisation efficace de STA lors de l'inondation par une STA polymère de la strate qui se traduit par une extraction supplémentaire du pétrole par unité de poids de la STA pompée dans la strate, ainsi qu'une diminution des pertes de STA inutiles. Ce procédé d'extraction de pétrole comprend les étapes suivantes: pomper dans la strate un premier anneau consistant en une solution polymère avec un inhibiteur d'adsorption; pomper dans la strate un deuxième anneau consistant en une solution de composition polymère de STA; pomper dans la strate un troisième anneau consistant en une solution polymère; pomper de l'eau dans la strate; et extraire le pétrole.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EA202293304 EA044722B1 (ru) | 2022-12-12 | Способ добычи нефти | |
EA202293304 | 2022-12-12 |
Publications (1)
Publication Number | Publication Date |
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WO2024125751A1 true WO2024125751A1 (fr) | 2024-06-20 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/EA2023/050009 WO2024125751A1 (fr) | 2022-12-12 | 2023-12-07 | Procédé d'extraction de pétrole |
Country Status (1)
Country | Link |
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WO (1) | WO2024125751A1 (fr) |
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2023
- 2023-12-07 WO PCT/EA2023/050009 patent/WO2024125751A1/fr unknown
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