CN114196391A - Acid liquor system for asphaltene reservoir and preparation method thereof - Google Patents
Acid liquor system for asphaltene reservoir and preparation method thereof Download PDFInfo
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- CN114196391A CN114196391A CN202010988906.4A CN202010988906A CN114196391A CN 114196391 A CN114196391 A CN 114196391A CN 202010988906 A CN202010988906 A CN 202010988906A CN 114196391 A CN114196391 A CN 114196391A
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- asphaltene
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- 239000002253 acid Substances 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 60
- -1 aldehyde ketone amine Chemical class 0.000 claims abstract description 53
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 50
- 239000002270 dispersing agent Substances 0.000 claims abstract description 40
- 239000002562 thickening agent Substances 0.000 claims abstract description 40
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000007797 corrosion Effects 0.000 claims abstract description 31
- 238000005260 corrosion Methods 0.000 claims abstract description 31
- 239000003112 inhibitor Substances 0.000 claims abstract description 31
- 239000003381 stabilizer Substances 0.000 claims abstract description 27
- 239000000654 additive Substances 0.000 claims abstract description 24
- 230000000996 additive effect Effects 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims description 38
- 125000002091 cationic group Chemical group 0.000 claims description 17
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 16
- 238000009833 condensation Methods 0.000 claims description 15
- 230000005494 condensation Effects 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 5
- XJWSAJYUBXQQDR-UHFFFAOYSA-M dodecyltrimethylammonium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)C XJWSAJYUBXQQDR-UHFFFAOYSA-M 0.000 claims description 5
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 3
- CSNHNGDROQRZKT-UHFFFAOYSA-M benzyl-dimethyl-tetradecylazanium;bromide Chemical compound [Br-].CCCCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 CSNHNGDROQRZKT-UHFFFAOYSA-M 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- DLFDEDJIVYYWTB-UHFFFAOYSA-N dodecyl(dimethyl)azanium;bromide Chemical compound Br.CCCCCCCCCCCCN(C)C DLFDEDJIVYYWTB-UHFFFAOYSA-N 0.000 claims description 3
- PGQAXGHQYGXVDC-UHFFFAOYSA-N dodecyl(dimethyl)azanium;chloride Chemical compound Cl.CCCCCCCCCCCCN(C)C PGQAXGHQYGXVDC-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 19
- 230000020477 pH reduction Effects 0.000 abstract description 13
- 239000003921 oil Substances 0.000 abstract description 12
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 230000035699 permeability Effects 0.000 description 7
- 239000010426 asphalt Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000015096 spirit Nutrition 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 3
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- GHOKWGTUZJEAQD-ZETCQYMHSA-N (D)-(+)-Pantothenic acid Chemical compound OCC(C)(C)[C@@H](O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-ZETCQYMHSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- GHOKWGTUZJEAQD-UHFFFAOYSA-N Chick antidermatitis factor Natural products OCC(C)(C)C(O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 229940055726 pantothenic acid Drugs 0.000 description 1
- 235000019161 pantothenic acid Nutrition 0.000 description 1
- 239000011713 pantothenic acid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
- C09K8/78—Eroding chemicals, e.g. acids combined with additives added for specific purposes for preventing sealing
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
Abstract
The invention discloses an acid liquor system for an asphaltene reservoir and a preparation method thereof, and belongs to the field of oil exploitation. The acid liquor system comprises the following components in percentage by mass: 12 to 20 percent of hydrochloric acid, 0.3 to 0.6 percent of polyacrylamide thickening agent, 0.5 to 2 percent of fluorocarbon cleanup additive, 1 to 3 percent of aldehyde ketone amine condensate corrosion inhibitor, 0.5 to 2 percent of iron ion stabilizer, 10 to 30 percent of asphaltene dissolving dispersant and the balance of water. The acid system for the asphaltene reservoir is suitable for acidification of the asphaltene reservoir, particularly for acidification of the asphaltene carbonate reservoir, and can dissolve and disperse the asphaltene in the reservoir to obtain a good acidification effect.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to an acid liquor system for an asphaltene reservoir and a preparation method thereof.
Background
For an asphaltene reservoir, the deposition of asphaltene can cause the porosity of the reservoir to be reduced, and the asphalt in the reservoir is dissociated after acidification, so that an oil and gas migration channel can be blocked in the migration of the reservoir, secondary damage can be caused to the reservoir, the acidification effect is reduced, and the asphaltene is required to be treated.
Currently, methods for treating asphaltenes include chemical organic solvent treatment and mechanical treatment, wherein the removal of asphaltenes from the formation is primarily by using chemical organic solvent treatment. At present, asphaltene is usually treated by using an asphalt dispersing agent, wherein the asphalt dispersing agent contains aromatic substances, polar surfactants and aromatic substances to disperse asphaltene deposits, polar molecules of the surfactants penetrate and disperse between colloid and asphaltene flaky molecules by virtue of strong hydrogen bond forming capability, and partially disassemble aggregates formed by plane overlapping and stacking to loosen the structure, reduce the order degree and the space extension degree and play a role in dispersing and stabilizing the asphaltene.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the asphalt dispersant is mainly used for removing the blockage of a shaft or a near-wellbore area in the process of thick oil production, but the decomposition effect on asphaltene sediments in pores of a high-temperature reservoir is not obvious.
Disclosure of Invention
In view of the above, the present invention provides an acid system for asphaltene reservoirs and a preparation method thereof, which can solve the above technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, an embodiment of the present invention provides an acid system for an asphaltene reservoir, where the acid system includes the following components by mass: 12 to 20 percent of hydrochloric acid, 0.3 to 0.6 percent of polyacrylamide thickening agent, 0.5 to 2 percent of fluorocarbon cleanup additive, 1 to 3 percent of aldehyde ketone amine condensate corrosion inhibitor, 0.5 to 2 percent of iron ion stabilizer, 10 to 30 percent of asphaltene dissolving dispersant and the balance of water.
In some possible implementations, the polyacrylamide-based thickener includes: cationic polyacrylamide and/or nonionic polyacrylamide.
In some possible implementations, the cationic polyacrylamide has a molecular weight of 200 to 1000 million.
In some possible implementations, the fluorocarbon-based cleanup additive includes: quaternary ammonium salt cationic fluorocarbon surfactant and/or ethoxy non-ionic fluorocarbon surfactant.
In some possible implementations, the corrosion inhibitor of the aldehyde ketone amine condensate type is formed by condensation of aldehyde ketone amines with a molecular weight of less than 1000 ten thousand.
In some possible implementations, the asphaltene-dissolving dispersant includes the following components in mass percent: 40-70% of ether, 5-15% of synergist, 10-30% of asphaltene stabilizer and the balance of solvent.
In some possible implementations, the ether has the general chemical formula R1-O-R2；
Wherein R is1And R2Is alkyl, and R1And R2The sum of the carbon numbers of (a) and (b) is 4 to 15.
In some possible implementations, the synergist is selected from at least one of mineral spirits No. 6, mineral spirits No. 120, mineral spirits No. 200, and mineral spirits No. 260.
In some possible implementations, the asphaltene stabilizer is selected from at least one of decaalkyltrimethylammonium chloride, decaalkyltrimethylammonium bromide, dodecyltrimethylammonium chloride, dodecyltrimethylammonium bromide, dodecyldimethylammonium chloride, dodecyldimethylammonium bromide, dodecyldimethylbenzylammonium chloride, tetradecyldimethylbenzylammonium bromide, and derivatives thereof.
In another aspect, an embodiment of the present invention provides a preparation method of any one of the acid liquid systems for an asphaltene reservoir, where the preparation method includes:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor in hydrochloric acid, stirring uniformly, then adding a polyacrylamide thickening agent, a fluorocarbon cleanup additive and an iron ion stabilizer, continuing stirring, and then sequentially adding an asphaltene dissolving dispersant and water to obtain the acid solution system for the asphaltene reservoir.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the acid liquor system provided by the embodiment of the invention can be suitable for acidification of an asphaltene reservoir, particularly for acidification of an asphaltene carbonate reservoir, through synergistic compounding of the components in the mass ratio, can dissolve and disperse asphaltenes in the reservoir, and obtains a good acidification effect. Dissolving an asphaltene reservoir by hydrochloric acid to strip out undissolved asphaltene in the reservoir; the polyacrylamide thickening agent, the fluorocarbon cleanup additive, the aldehyde ketone amine condensate corrosion inhibitor and the iron ion stabilizer are used for carrying out composite action with asphaltene molecules, so that the mutual repulsion action among the asphaltene molecules is increased, and the formation of aggregates is avoided; the asphaltene dissolves the dispersant to ensure that the asphaltene molecule of separation disperses in the liquid phase steadily, discharges the stratum along with the raffinate of flowing acidizing fluid system, has avoided causing secondary jam or injury to the stratum.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clear, embodiments of the present invention will be described in further detail below.
In one aspect, an embodiment of the present invention provides an acid system for an asphaltene reservoir, where the acid system includes the following components by mass: 12 to 20 percent of hydrochloric acid, 0.3 to 0.6 percent of polyacrylamide thickening agent, 0.5 to 2 percent of fluorocarbon cleanup additive, 1 to 3 percent of aldehyde ketone amine condensate corrosion inhibitor, 0.5 to 2 percent of iron ion stabilizer, 10 to 30 percent of asphaltene dissolving dispersant and the balance of water.
The acid liquor system provided by the embodiment of the invention can be suitable for acidification of an asphaltene reservoir, particularly for acidification of an asphaltene carbonate reservoir, through synergistic compounding of the components in the mass ratio, can dissolve and disperse asphaltenes in the reservoir, and obtains a good acidification effect. Dissolving an asphaltene reservoir by hydrochloric acid to strip out undissolved asphaltene in the reservoir; the polyacrylamide thickening agent, the fluorocarbon cleanup additive, the aldehyde ketone amine condensate corrosion inhibitor and the iron ion stabilizer are used for carrying out composite action with asphaltene molecules, so that the mutual repulsion action among the asphaltene molecules is increased, and the formation of aggregates is avoided; the asphaltene dissolves the dispersant to ensure that the asphaltene molecule of separation disperses in the liquid phase steadily, discharges the stratum along with the raffinate of flowing acidizing fluid system, has avoided causing secondary jam or injury to the stratum.
The acid solution system capable of dissolving and dispersing the reservoir asphaltene provided by the embodiment of the invention has a good transformation effect on the reservoir containing asphaltene, is safe and stable, is suitable for transformation of the reservoir containing asphaltene, and can be used for removing the blockage in the near-wellbore area.
The following description is provided for each component and its effect in the acid system provided by the embodiment of the present invention:
(1) for hydrochloric acid
In the embodiment of the invention, the asphaltene carbonate reservoir is acidified and dissolved by hydrochloric acid so as to strip out the asphaltene contained in the asphaltene carbonate reservoir.
As an example, the hydrochloric acid is selected from industrial hydrochloric acid (for example, 30%, 31%, or 36% by mass), and has an advantage of low cost while satisfying the above effects.
(2) For polyacrylamide type thickeners
The polyacrylamide thickener is also called polyacrylamide thickener, and can improve the viscosity of the acid liquor system so as to ensure that the acid liquor system can fully penetrate into the reservoir and deep in the reservoir, thereby ensuring the transformation effect of the acid liquor system on the asphaltene reservoir.
In order to optimize the above effects, the polyacrylamide thickening agents used in the embodiments of the present invention are cationic polyacrylamide and/or nonionic polyacrylamide.
Further, the molecular weight of the cationic polyacrylamide is 200 to 1000 ten thousand, for example 300 to 900 ten thousand.
(3) For fluorocarbon-based cleanup additive
The fluorocarbon cleanup additive has high surface activity and stability, can improve and improve the wettability, permeability and diffusivity of the acid liquor system to stratum rocks and the fluidity of crude oil, effectively reduces the surface tension of an oil-water interface, has little damage to the stratum, and can maintain stable performance under severe environments with high temperature, acidity and mineralization degree.
In the embodiment of the invention, the used fluorocarbon cleanup additive comprises: quaternary ammonium salt cationic fluorocarbon surfactant and/or ethoxy non-ionic fluorocarbon surfactant.
The fluorocarbon cleanup additive has better synergistic compounding effect with other components in the acid liquor system, and can further optimize the effect.
(4) Corrosion inhibitors for aldehyde ketone amine condensates
According to the embodiment of the invention, the aldehyde ketone amine condensate corrosion inhibitor is used for preventing the acid liquor system from corroding equipment, wherein the aldehyde ketone amine condensate corrosion inhibitor is suitable for high-concentration acid, low in damage and high in corrosion inhibition rate.
For example, in the embodiment of the present invention, the aldehyde ketone amine condensate corrosion inhibitor is prepared by condensing aldehyde ketone amine with a molecular weight of less than 1000 ten thousand.
(5) Stabilizing agent for iron ion
The iron ion stabilizer is formed by combining an iron complexing agent, an iron reducing agent and the like, and the main components are organic acid and salt, so that the effect of stabilizing iron ions in a stratum under the pH value of pantothenic acid can be realized.
(6) For asphaltene dissolving dispersant
According to the embodiment of the invention, the asphaltene is dissolved with the dispersing agent to ensure that the separated asphaltene molecules are stably dispersed in the liquid phase, so that the asphaltene is discharged out of the stratum along with the residual liquid of the flowing acid system, and secondary blockage or damage to the stratum is avoided.
In some possible implementations, the asphaltene-dissolving dispersant provided by the embodiments of the present invention includes the following components in percentage by mass: 40-70% of ether, 5-15% of synergist, 10-30% of asphaltene stabilizer and the balance of solvent.
The content of the ether is preferably 45% to 65% based on the total mass of the asphaltene-dissolving dispersant.
The content of the synergist is preferably 10% to 15% based on the total mass of the asphaltene-dissolving dispersant.
The content of the asphaltene stabilizer is preferably 15% to 25% based on the total mass of the asphaltene-dissolving dispersant.
The asphaltene dissolving dispersant of the components has better synergistic compounding effect with other components in an acid liquor system, and is beneficial to further optimizing the dispersing effect on asphaltene molecules.
Wherein the above ether has a chemical formula of R1-O-R2；R1And R2Is alkyl, and R1And R2The sum of the carbon numbers of (a) and (b) is 4 to 15.
R1、R2May be the same or different, R1And R2Each independently is a straight chain alkyl or branched alkyl, further, R1、R2Preferably a straight chain alkyl group.
The above ether may be, for example, butyl ether, ethylene glycol butyl ether, or the like.
The synergist is used for further enhancing the solubility and dispersibility of the asphaltene, and in the embodiment of the invention, the synergist is selected from at least one of No. 6 solvent oil, No. 120 solvent oil, No. 200 solvent oil and No. 260 solvent oil.
The stabilizer can be better dissolved in an acid system and prevent the re-aggregation of the dispersed asphalt, and in the embodiment of the invention, the asphaltene stabilizer is selected from at least one of dodecyl trimethyl ammonium chloride, dodecyl trimethyl ammonium bromide, dodecyl dimethyl ammonium chloride, dodecyl dimethyl ammonium bromide, dodecyl dimethyl benzyl ammonium chloride, tetradecyl dimethyl benzyl ammonium bromide and derivatives thereof.
Solvents included in the asphaltene-dissolving dispersant include, but are not limited to: methanol, ethanol, propanol, and the like.
In another aspect, embodiments of the present invention further provide a preparation method of any one of the above acid systems for an asphaltene reservoir, where the preparation method includes:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor in hydrochloric acid, stirring uniformly, then adding a polyacrylamide thickening agent, a fluorocarbon cleanup additive and an iron ion stabilizer, continuing stirring, and then sequentially adding an asphaltene dissolving dispersant and water to obtain an acid solution system for the asphaltene reservoir.
For example, the aldehyde ketone amine condensate corrosion inhibitor is dissolved into 31% by mass of industrial hydrochloric acid (the aldehyde ketone amine condensate corrosion inhibitor must be added into concentrated acid to ensure that the corrosion inhibitor is fully dissolved), the mixture is stirred at the rotating speed of 500rpm to 800rpm, the polyacrylamide thickener is slowly added while the mixture is stirred, the mixture is continuously stirred for half an hour until the polyacrylamide thickener is fully dissolved, then the fluorocarbon cleanup additive and the asphaltene dissolving and dispersing agent are added, and the mixture is continuously stirred uniformly to obtain the acid solution system for the asphaltene reservoir, which is expected by the embodiment of the invention.
The invention will be further described by the following specific examples:
example 1
The embodiment provides an acid system for an asphaltene reservoir, which comprises the following components in percentage by mass: 18 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 0.4 percent of cationic polyacrylamide thickening agent with the molecular weight of 800 ten thousand, 1 percent of quaternary ammonium salt cationic fluorocarbon surfactant, 2 percent of aldehyde ketone amine condensation compound corrosion inhibitor, 1 percent of iron ion stabilizer, 20 percent of asphaltene dissolving dispersant and the balance of water.
Wherein the asphaltene dissolving and dispersing agent comprises the following components in percentage by mass: 60% of butyl ether, 10% of No. 6 solvent oil, 15% of dodecyl trimethyl ammonium bromide and the balance of methanol.
The preparation of the acid system for asphaltene reservoirs of example 1 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at 700rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon cleanup additive and the asphaltene dissolving and dispersing agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid solution system for the asphaltene reservoir in the embodiment.
Example 2
The embodiment provides an acid system for an asphaltene reservoir, which comprises the following components in percentage by mass: 12 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 0.6 percent of nonionic polyacrylamide thickening agent, 1.5 percent of ethoxy nonionic fluorocarbon cleanup additive, 1 percent of aldehyde ketone amine condensate corrosion inhibitor, 1.5 percent of iron ion stabilizer, 10 percent of asphaltene dissolving dispersant and the balance of water.
Wherein the asphaltene dissolving and dispersing agent comprises the following components in percentage by mass: 70% of ethylene glycol butyl ether, 5% of No. 260 solvent oil, 20% of dodecyl trimethyl ammonium chloride and the balance of methanol.
The preparation of the acid system for asphaltene reservoirs of this example 2 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at the rotating speed of 500rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon cleanup additive and the asphaltene dissolving and dispersing agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid liquid system for the asphaltene reservoir in the embodiment.
Example 3
The embodiment provides an acid system for an asphaltene reservoir, which comprises the following components in percentage by mass: 20 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 0.3 percent of cationic polyacrylamide thickening agent, 1.2 percent of quaternary ammonium salt cationic fluorocarbon surfactant, DW-33 percent of aldehyde ketone amine condensation compound corrosion inhibitor, 2 percent of iron ion stabilizer, 15 percent of asphaltene dissolving dispersant and the balance of water.
Wherein the asphaltene dissolving and dispersing agent comprises the following components in percentage by mass: 40% of ethylene glycol butyl ether, 15% of No. 200 solvent oil, 10% of dodecyl trimethyl ammonium bromide and the balance of propanol.
The preparation method of the acid system for asphaltene reservoirs of example 3 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at the rotating speed of 800rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon cleanup additive and the asphaltene dissolving and dispersing agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid liquid system for the asphaltene reservoir in the embodiment.
Example 4
The embodiment provides an acid system for an asphaltene reservoir, which comprises the following components in percentage by mass: 15 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 24 to 90.5 percent of polyacrylamide thickening agent CT1 to 120.5 percent of fluorocarbon cleanup additive CT5 to 120.5 percent, 0.5 percent of aldehyde ketone amine condensate corrosion inhibitor CT1 to 31.5 percent, 0.5 percent of iron ion stabilizer, 30 percent of asphaltene dissolving dispersant and the balance of water.
Wherein the asphaltene dissolving and dispersing agent comprises the following components in percentage by mass: 55% of butyl ether, 12% of No. 120 solvent oil, 25% of dodecyl trimethyl ammonium chloride and the balance of ethanol.
The preparation of the acid system for asphaltene reservoirs of this example 4 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at 600rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon cleanup additive and the asphaltene dissolving and dispersing agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid solution system for the asphaltene reservoir in the embodiment.
Comparative example 1
The comparative example provides a gelling acid comprising the following components in mass percent: 18 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 2.4 percent of cationic polyacrylamide thickening agent with the molecular weight of 800 ten thousand, 1 percent of quaternary ammonium salt cationic fluorocarbon surfactant, 2 percent of aldehyde ketone amine condensate corrosion inhibitor, 1 percent of iron ion stabilizer, 20 percent of asphaltene dissolving dispersant and the balance of water.
The preparation method of the acid system for asphaltene reservoirs provided in this comparative example 1 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at 700rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon auxiliary agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid liquid system for the asphaltene reservoir.
Comparative example 2
The comparative example provides a gelling acid comprising the following components in mass percent: 12 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 1.6 percent of nonionic polyacrylamide thickening agent, 1.5 percent of ethoxy nonionic fluorocarbon cleanup additive, 1.5 percent of iron ion stabilizer, 10 percent of asphaltene dissolving dispersant and the balance of water.
The preparation method of the acid system for asphaltene reservoirs provided in this comparative example 2 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at the rotating speed of 500rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon auxiliary agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid liquid system for the asphaltene reservoir.
Comparative example 3
The comparative example provides a gelling acid comprising the following components in mass percent: 20% of industrial hydrochloric acid with the mass concentration of 31%, 3.3% of cationic polyacrylamide thickening agent, 1.2% of quaternary ammonium salt cationic fluorocarbon surfactant, 2% of iron ion stabilizer, 15% of asphaltene dissolving dispersant and the balance of water.
The preparation method of the acid system for asphaltene reservoirs provided in this comparative example 3 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at 800rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon auxiliary agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid liquid system for the asphaltene reservoir.
Comparative example 4
The comparative example provides a gelling acid comprising the following components in mass percent: 15 percent of industrial hydrochloric acid with the mass concentration of 31 percent, 1-92 percent of polyacrylamide thickening agent CT, 5-120.5 percent of fluorocarbon cleanup additive CT, 0.5 percent of iron ion stabilizer, 30 percent of asphaltene dissolving dispersant and the balance of water.
The preparation method of the acid system for asphaltene reservoirs provided in this comparative example 4 is as follows:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor into 31% of industrial hydrochloric acid, stirring at the rotating speed of 600rpm for half an hour, slowly adding the polyacrylamide thickening agent while stirring, continuously stirring for half an hour, adding the fluorocarbon auxiliary agent after the polyacrylamide thickening agent is completely dissolved, and continuously stirring uniformly to obtain the acid liquid system for the asphaltene reservoir in the embodiment.
Test examples
Taking two standard marble rock cores A1 and A2 with the diameter of 25mm and the length of 40mm, making an artificial crack on a bisection seam, smearing 2g of asphalt in the seam, overlapping rock plates, and sticking the rock plates for later use to obtain test rock plates B1 and B2.
The initial permeabilities K1, K2 of the two test panels B1, B2, respectively, were tested with brine using a core flow tester.
The gelled acid provided in comparative examples 1-4 was tested using B1 and the final permeability of B1 after acidification with a gelled acid was tested at formation temperature and pressure.
The acid systems provided in examples 1-4 were tested using B2 to test the final permeability of B2 after acidizing each of the acid systems described above at formation temperature and pressure.
The initial permeability and final permeability of the test panels B1, B2 were compared to evaluate the effect of each acid system and gelled acid on the recovery of the original permeability.
The test results are shown in table 1 below:
TABLE 1
As can be seen from table 1, the acid solution systems provided in embodiments 1 to 4 of the present invention can be used for acidifying an asphaltene carbonate reservoir, dissolving and dispersing asphaltenes in the reservoir, and obtaining a good acidifying effect. Compared with comparative examples 1-4 without asphaltene dissolving dispersants, the acid system provided in examples 1-4 has better acidification effect on the asphaltene carbonate reservoir.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An acid system for an asphaltene reservoir, characterized in that the acid system comprises the following components in percentage by mass: 12 to 20 percent of hydrochloric acid, 0.3 to 0.6 percent of polyacrylamide thickening agent, 0.5 to 2 percent of fluorocarbon cleanup additive, 1 to 3 percent of aldehyde ketone amine condensate corrosion inhibitor, 0.5 to 2 percent of iron ion stabilizer, 10 to 30 percent of asphaltene dissolving dispersant and the balance of water.
2. Acid system for asphaltene reservoirs according to claim 1, characterized in that the polyacrylamide-based viscosifier comprises: cationic polyacrylamide and/or nonionic polyacrylamide.
3. Acid system for asphaltene reservoirs according to claim 2, characterized in that the cationic polyacrylamide has a molecular weight of 200-1000 ten thousand.
4. The acid system for asphaltene reservoirs according to claim 1, wherein the fluorocarbon-based cleanup additive comprises: quaternary ammonium salt cationic fluorocarbon surfactant and/or ethoxy non-ionic fluorocarbon surfactant.
5. The acid system for asphaltene reservoirs according to claim 1, wherein the inhibitor of the class of aldehyde ketone amine condensates is formed by condensation of aldehyde ketone amines having a molecular weight of less than 1000 ten thousand.
6. The acid system for asphaltene reservoirs according to claim 1, wherein the asphaltene dissolution dispersant comprises the following components in mass percent: 40-70% of ether, 5-15% of synergist, 10-30% of asphaltene stabilizer and the balance of solvent.
7. Acid system for asphaltene reservoirs according to claim 6, characterized in that the ether has the general chemical formula R1-O-R2；
Wherein R is1And R2Is alkyl, and R1And R2The sum of the carbon numbers of (a) and (b) is 4 to 15.
8. The acid system for an asphaltene reservoir of claim 6, wherein the synergist is selected from at least one of mineral spirit No. 6, mineral spirit No. 120, mineral spirit No. 200, and mineral spirit No. 260.
9. The acid system for an asphaltene reservoir of claim 6, wherein the asphaltene stabilizer is selected from at least one of the group consisting of decaalkyltrimethylammonium chloride, decaalkyltrimethylammonium bromide, dodecyltrimethylammonium chloride, dodecyltrimethylammonium bromide, dodecyldimethylammonium chloride, dodecyldimethylammonium bromide, dodecyldimethylbenzylammonium chloride, tetradecyldimethylbenzylammonium bromide, and derivatives thereof.
10. Process for the preparation of an acid system for asphaltene reservoirs according to any of claims 1 to 9, characterized in that it comprises:
dissolving the aldehyde ketone amine condensation compound corrosion inhibitor in hydrochloric acid, stirring uniformly, then adding a polyacrylamide thickening agent, a fluorocarbon cleanup additive and an iron ion stabilizer, continuing stirring, and then sequentially adding an asphaltene dissolving dispersant and water to obtain the acid solution system for the asphaltene reservoir.
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