CN104314540A - Method for controlling steam channeling of steam-injected oil reservoir - Google Patents
Method for controlling steam channeling of steam-injected oil reservoir Download PDFInfo
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- CN104314540A CN104314540A CN201410409126.4A CN201410409126A CN104314540A CN 104314540 A CN104314540 A CN 104314540A CN 201410409126 A CN201410409126 A CN 201410409126A CN 104314540 A CN104314540 A CN 104314540A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention provides a method for controlling steam channeling of a steam-injected oil reservoir. The method comprises the following steps: injecting fiber solution into an injection well in which the steam channeling occurs to form a fiber section plug; injecting nano-particle solution into the injection well in which the steam channeling occurs to form a nanoparticle section plug; when the injection pressure is higher than the average steam injection pressure of a steam channeling section by 3-5MPa, the water content of a steam channeling production well is reduced to below 60 percent, and when the temperature of a wellhead of the production well is reduced to below 100DEG C, injecting the steam again, and finishing the control over the steam channeling of the steam-injected oil reservoir. According to the method for controlling the steam channeling of the steam-injected oil reservoir, provided by the invention, the porosity space of a reservoir with a high permeability zone can be effectively reduced, the permeability of the reservoir is reduced, the high permeability zone is blocked, and the action of controlling the steam channeling is achieved.
Description
Technical field
The present invention relates to a kind of exploitation method of oil reservoir, particularly relate to a kind of steam injection oil reservoir control vapour and alter method, belong to technical field of petroleum extraction.
Background technology
For the heavy crude reservoir of underground viscosity of crude higher than 1000MPas, usually adopt steam injection heating exploitation, steam injection heating exploitation comprises steam flooding exploitation method, cyclic steam stimulation method and SAGD exploitation method.
In steam drive development process, because oil reservoir has non-homogeneity, usually crack and high permeable strip is there is in reservoir, inject steam easily alter along crack and high permeable strip into, all show, in steam-drive process with the neat 40 pieces of steam flooding field tests in Liaohe Oil Field and Xinjiang Oilfield shallow super heavy oil steam flooding field test, steam vapour is altered frequently, steam flooding swept volume is little, and gas oil ratio is low, and economic benefit is poor.
In steam soak development process, owing to being generally high speed short-term steam injection, and be subject to the quantitative limitation of on-site steam boiler number, may accomplish that the oil well of a production zone concentrates steam injection simultaneously hardly, therefore between adjacent well during steam injection Time Inconsistency, under Reservoir Fracture and heterogeneous conditions, high speed steam injection often causes the offset well vapour produced to alter, make to inject steam to be difficult to effectively heat the reservoir near well of handling up and crude oil, cause the effective production time of the steam soak recovery phase of each round short, production per cycle is low.Especially handle up the stage in high round, due to Reservoir Fracture and heterogeneous existence, add thermal communication between well, vapour in steam injection process is altered and now often occurs, this is also the poor main cause of high round throughput prediction.
Steam assisted gravity drainage techniques (being called for short: SAGD technology) the usually vertical distance of vertical upper stacked, the horizontal segment mutually of employing is two mouthfuls of water horizontal wells of about 5 meters, as a SAGD injection-production well group, utilize reservoir upper water horizontal well steam injection, utilize the onlap effect of steam, the crude oil of heating oil reservoir middle and upper part, and the mode flowing into the horizontal well producing well of reservoir bottom is under gravity developed.Above-mentioned SAGD technology is only applicable to reservoir heterogeneity more weak (layer intrinsic permeability is differential is less than 3), without obvious fracture developing zone and continuously core intersection be greater than the oil reservoir of 15m, for non-homogeneity comparatively strong (layer intrinsic permeability is differential is greater than 3), there is local high permeable strip and fracture developing zone, or core intersection is less than the heavy crude reservoir of 15m continuously, be then not suitable for using SAGD technology to develop.
Therefore, for heterogeneous body comparatively strong (layer intrinsic permeability is differential is greater than 3), the heavy crude reservoir that there is local high permeable strip and fracture developing zone, main exploitation method is steam soak and steam driving exploitation mode at present, and adopt in steam soak and steam driving exploitation process, it is very serious that vapour alters phenomenon, therefore, how preventing and treating vapour and alter, is a Pinch technology difficult problem for these two kinds of mining types of restriction.
At present, high temperature resistant water base poly-attached dose, polymer and the clay stabilizer etc. such as special thickener be used to shutoff vapour and drive high permeable strip, and seen good mining site effect, but due to consumption large, expensive, limit it and use on a large scale.
In sum, seek a kind of effective, consumption is few, and economically viable control vapour alters method, is the key improving steam flooding reservoirs development effectiveness.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of steam injection oil reservoir to prevent and treat vapour and alter method, the method can reduce the permeability of high permeable strip, can play the effect preventing and treating vapour and alter to steam injection oil reservoir.
In order to achieve the above object, the invention provides a kind of steam injection oil reservoir control vapour and alter method, the method comprises the following steps:
Step one: inject fiber solution in the Injection Well that generation vapour is altered, form fiber slug; Wherein, described fiber solution is made up of fiber, cellulose thickener and formation water, and the mass ratio of described cellulose thickener and formation water is 0.01:1-0.1:1, and described fiber accounts for the 1%-50% of fiber solution gross mass; Cellulose thickener and the composite viscous water of formation water are as the carrier solution in fiber solution, and composite conveniently composite operation is carried out;
Step 2: the solution injecting nano particle in the Injection Well that generation vapour is altered, forms nano particle slug; Wherein, the solution of the nano particle of employing is made up of nano particle, dispersing agent and formation water, and the mass ratio of dispersing agent and formation water is 0.01:1-0.1:1, and described nano particle accounts for the 1%-50% of the gross mass of the solution of nano particle; The carrier solution of the solution of dispersing agent and the composite formation nano particle of formation water, composite conveniently composite operation is carried out;
Step 3: when the injection pressure in step 2 alters the average steam injection pressure height 3MPa-5MPa in stage than vapour, the moisture content that vapour alters producing well drops to less than 60%, and the temperature of producing well well head is when dropping to below 100 DEG C, refills steam, complete the control that steam injection oil reservoir vapour is altered.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, preferably, the cellulose thickener of employing comprises the combination of one or more in sodium carboxymethylcellulose, carboxymethyl 2-sodium hydroxyethlcellulose, carboxyethyl cellulose, methylcellulose, 2-carboxylic propyl methocel, 2-carboxyethylmethylcellulose, 2-carboxylic butyl methyl cellulose, 2-carboxyethyl ethyl cellulose and 2-carboxy-propyl cellulose.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, and preferably, the salinity of the formation water of employing is 1000-100000ppm.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, preferably, the fiber adopted is formed by one or both in resistant to elevated temperatures polyester fiber and resistant to elevated temperatures polyacrylonitrile fibre and carbon fibers, and the mass content of described carbon fiber in described fiber is greater than 50%.
Steam injection oil reservoir provided by the present invention control vapour is altered in method, and preferably, the molecular weight of the polyester fiber of employing is 18000-25000, and most high-temperature resistant temperature (fusing point) is 300 DEG C; The molecular weight of described polyacrylonitrile fibre is 50000-150000, and most high-temperature resistant temperature (fusing point) is 320 DEG C.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, preferably, the nano particle of employing comprises the combination of one or more in aluminum oxide nanoparticle, magnesium oxide nanoparticle, ferric oxide nanometer particle, nickel oxide nanoparticle, Zinc oxide nanoparticle, Zirconium oxide nano grain, the monox nanometer particle of siloxane treated, Hydrophobic silica nano particle, antimony oxide nano particle and calcium oxide nano particle.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, and preferably, the particle diameter of the nano particle of employing is 1nm-1000nm.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, preferably, the dispersing agent adopted is combined by one or more in triethyl group hexyl phosphoric acid, lauryl sodium sulfate, methyl anyl alcohol and guar gum and PAMC, wherein, the mass content of PAMC in dispersing agent is greater than 20%; More preferably, the molecular weight of the PAMC of employing is 8,000,000-1,200 ten thousand.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, and preferably, in step one, the injection rate of described fiber solution is 100-1000 ton, and injection rate is 10-100 ton/sky.
Steam injection oil reservoir control vapour provided by the present invention is altered in method, and preferably, in step 2, the injection rate of the solution of described nano particle is 100-1000 ton, and injection rate is 10-100 ton/sky.
Steam injection oil reservoir control vapour provided by the invention alters method, has the following advantages:
1, alter in method at above-mentioned steam injection oil reservoir control vapour, first fiber solution is injected, utilize viscous water as the carrier solution of fiber solution, higher fluid viscosity can realize the stable suspersion of fiber, after the fiber based on carbon fiber injects oil reservoir, because each root carbon fiber is made up of thousands of more small carbon fibers, there is huge specific area; Meanwhile, because carbon fiber is not crystal structure, interlayer links extremely irregular, be conducive to like this fiber high permeable strip and vapour alter in passage formed stable netted mutual around structure.In addition, the viscous water adopted is by cellulose thickener and formation water is composite forms, and the fiber of cellulose thickener and injection has good compatibility, effectively can suppress the degraded of injecting fiber, strengthen its stability, adopt formation water to maintain the compatibility of itself and formation fluid conditions simultaneously.
2, in the above-mentioned methods, the nano particle injected has larger specific area and higher energy of adsorption, porous media space rock surface and reticular fibre surface is adsorbed in the high permeable strip of reservoir, and the fixing reservoir particulate suspending or loosen, the high flow rate because of steam injection process medium to high permeable band is stoped to cause the migration of formation fines, and stop cancellated fiber to break in high speed steam injection process, thus guarantee to realize stable plugging effect.
3, the carrier solution that uses of the solution of nano particle is by dispersing agent and formation water is composite forms, the dispersing agent adopted forms adsorption layer on the surface of nano particle, the electric charge of nano grain surface is increased, improve the reaction force between the nano particle forming steric hindrance, therefore, stable nanoparticulate dispersed and suspension system can be formed, prevent nanoparticle aggregate in injection process from causing the problem injecting difficulty.Because high permeable strip resistance is little, the solution of nano particle preferentially enters high permeable strip, nano particle in solution adsorbs and is attached to rock particles surface and reticular fibre surface, form the nanometer film that progressive additive adsorbs layer by layer, thus effectively reduce the reservoir pore space of high permeable strip, reduce its permeability, thus reach the object of preventing and treating vapour and altering.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
Present embodiments provide a kind of steam injection oil reservoir control vapour being applied to certain steam flooding heavy crude reservoir and alter method, comprise the following steps:
Step one: alter in Injection Well to vapour and inject fiber solution 100 tons, form fiber slug, injection rate is 10 tons/day;
Wherein, the formation water that the fiber solution adopted is 3000ppm by fiber, cellulose thickener (sodium carboxymethylcellulose) and salinity forms, cellulose thickener and the composite viscous water of formation water are as the carrier solution of fiber solution, the mass ratio of cellulose thickener and formation water is 0.01:1, fiber is made up of carbon fiber and resistant to elevated temperatures polyester fiber, fiber accounts for 1% of fiber solution gross mass, and carbon fiber accounts for 60% of total fiber mass; The molecular weight of resistant to elevated temperatures polyester fiber is 20,000, and most high-temperature resistant temperature is 300 DEG C.
Step 2: alter in Injection Well the solution 100 tons injecting nano particle to vapour, form nano particle slug, injection rate is 10 tons/day;
Wherein, the solution of the nano particle of employing is made up of nano particle, dispersing agent and formation water; Dispersing agent and formation water receive the carrier solution of solution of wooden particle with the composite formation of the mass ratio of 0.01:1; The nano particle adopted accounts for 1% of the solution gross mass of nano particle, and the particle diameter of nano particle is 1nm;
The nano particle adopted by etc. the aluminum oxide nanoparticle of quality, magnesium oxide nanoparticle, ferric oxide nanometer particle, nickel oxide nanoparticle, Zinc oxide nanoparticle, Zirconium oxide nano grain, the monox nanometer particle of siloxane treated, Hydrophobic silica nano particle, antimony oxide nano particle and calcium oxide nano particle proportioning form;
The dispersing agent adopted by PAMC (molecular weight is 8,000,000) with etc. the triethyl group hexyl phosphoric acid of quality, lauryl sodium sulfate, methyl anyl alcohol and guar gum form, wherein, the mass content of PAMC in dispersing agent is 30%.
Step 3: when the injection pressure of step 2 to alter the average steam injection pressure height 3MPa in stage than vapour, vapour is altered producing well moisture content and dropped to 55%, and when producing well wellhead temperature drops to 90 DEG C, refills steam, completes the control of altering steam injection oil reservoir vapour.
Continue steam flooding after adopting said method process gassed-out well, this well group daily average oil production improves 3 times, and gas oil ratio brings up to 0.3 by 0.1, estimates finally can improve recovery ratio 5%, improves steam drive development successful.
Embodiment 2
Present embodiments provide a kind of steam injection oil reservoir control vapour being applied to certain steam flooding heavy crude reservoir and alter method, comprise the following steps:
Step one: alter in Injection Well to vapour and inject fiber solution 500 tons, form fiber slug, injection rate is 50 tons/day;
Wherein, the formation water that the fiber solution adopted is 10000ppm by fiber, cellulose thickener (carboxymethyl 2-sodium hydroxyethlcellulose) and salinity forms, cellulose thickener and the composite viscous water of formation water are as the carrier solution of fiber solution, the mass ratio of cellulose thickener and formation water is 0.05:1, adopt fiber by carbon fiber with etc. resistant to elevated temperatures polyester fiber form, fiber accounts for 10% of fiber solution gross mass, and carbon fiber accounts for 80% of total fiber mass; The molecular weight of resistant to elevated temperatures polyester fiber is 18000, and most high-temperature resistant temperature is 300 DEG C.Step 2: alter in Injection Well the solution 500 tons injecting nano particle to vapour, form nano particle slug, injection rate is 50 tons/day;
Wherein, the solution of the nano particle of employing is made up of nano particle, dispersing agent and formation water; Dispersing agent and formation water receive the carrier solution of solution of wooden particle with the composite formation of the mass ratio of 0.05:1; Nano particle accounts for 25% of the solution gross mass of nano particle; The particle diameter of nano particle is 500nm;
The nano particle adopted by etc. the aluminum oxide nanoparticle of quality, magnesium oxide nanoparticle, ferric oxide nanometer particle, nickel oxide nanoparticle, Zinc oxide nanoparticle, Zirconium oxide nano grain, the monox nanometer particle of siloxane treated, Hydrophobic silica nano particle, antimony oxide nano particle and calcium oxide nano particle proportioning form;
The dispersing agent adopted by PAMC (molecular weight is 9,000,000) with etc. the triethyl group hexyl phosphoric acid of quality, lauryl sodium sulfate, methyl anyl alcohol and guar gum form, wherein, the mass content of PAMC in dispersing agent is 50%.
Step 3: when the injection pressure of step 2 to alter the average steam injection pressure height 4MPa in stage than vapour, vapour is altered producing well moisture content and dropped to 50%, and when producing well wellhead temperature drops to 80 DEG C, refills steam, completes the control of altering steam injection oil reservoir vapour.
Continue steam flooding after adopting said method process gassed-out well, this well group daily average oil production improves 2.5 times, and gas oil ratio brings up to 0.2 by 0.12, estimates finally can improve recovery ratio 4%, improves steam drive development successful.
Embodiment 3
Present embodiments provide a kind of steam injection oil reservoir control vapour being applied to certain steam flooding heavy crude reservoir and alter method, comprise the following steps:
Step one: alter in Injection Well to vapour and inject fiber solution 1000 tons, form fiber slug, injection rate is 100 tons/day;
Wherein, the formation water that the fiber solution adopted is 80000ppm by fiber, cellulose thickener (2-carboxylic butyl methyl cellulose) and salinity forms, cellulose thickener and the composite viscous water of formation water are as the carrier solution of fiber solution, the mass ratio of cellulose thickener and formation water is 0.1:1, the fiber adopted is made up of carbon fiber and resistant to elevated temperatures polyacrylonitrile fibre, carbon fiber accounts for 90% of total fiber mass, and fiber accounts for 50% of fiber solution gross mass; The molecular weight of resistant to elevated temperatures polyacrylonitrile fibre is 50000, and most high-temperature resistant temperature is 320 DEG C.
Step 2: alter in Injection Well the solution 1000 tons injecting nano particle to vapour, form nano particle slug, injection rate is 100 tons/day;
Wherein, the solution of the nano particle of employing is made up of nano particle, dispersing agent and formation water; Dispersing agent and formation water receive the carrier solution of solution of wooden particle with the composite formation of the mass ratio of 0.1:1; Nano particle accounts for 50% of the solution gross mass of nano particle; The particle diameter of nano particle is 1000nm, nano particle by etc. the aluminum oxide nanoparticle of quality, magnesium oxide nanoparticle, ferric oxide nanometer particle, nickel oxide nanoparticle, Zinc oxide nanoparticle, Zirconium oxide nano grain, the monox nanometer particle of siloxane treated, Hydrophobic silica nano particle, antimony oxide nano particle and calcium oxide nano particle proportioning form;
The dispersing agent adopted by PAMC (molecular weight is 1,200 ten thousand) with etc. the triethyl group hexyl phosphoric acid of quality, lauryl sodium sulfate, methyl anyl alcohol and guar gum form, wherein, the content of PAMC in dispersing agent is 80%.
Step 3: when the injection pressure of step 2 to alter the average steam injection pressure height 5MPa in stage than vapour, vapour is altered producing well moisture content and dropped to 40%, and when producing well wellhead temperature drops to 70 DEG C, refills steam, completes the control of altering steam injection oil reservoir vapour.
Continue steam flooding after taking said method process gassed-out well, this well group daily average oil production improves 5 times, and gas oil ratio brings up to 0.3 by 0.12, estimates finally can improve recovery ratio 7%, improves steam drive development successful.
In sum, when the control vapour method of altering provided by the invention is applied to steam flooding heavy crude reservoir, effectively can reduces the reservoir pore space of high permeable strip, reduce its permeability, shutoff high permeable strip, the effect well preventing vapour from altering can be played.
Claims (10)
1. steam injection oil reservoir control vapour alters a method, and the method comprises the following steps:
Step one: inject fiber solution in the Injection Well that generation vapour is altered, form fiber slug; Wherein, described fiber solution is made up of fiber, cellulose thickener and formation water, and the mass ratio of described cellulose thickener and formation water is 0.01:1-0.1:1, and described fiber accounts for the 1%-50% of fiber solution gross mass;
Step 2: the solution injecting nano particle in the Injection Well that generation vapour is altered, forms nano particle slug; The solution of described nano particle is made up of nano particle, dispersing agent and formation water, and the mass ratio of described dispersing agent and formation water is 0.01:1-0.1:1, and described nano particle accounts for the 1%-50% of the gross mass of the solution of nano particle;
Step 3: when the injection pressure in step 2 alters the average steam injection pressure height 3MPa-5MPa in stage than vapour, the moisture content that vapour alters producing well drops to less than 60%, and the temperature of producing well well head is when dropping to below 100 DEG C, refills steam, complete the control that steam injection oil reservoir vapour is altered.
2. steam injection oil reservoir control vapour according to claim 1 alters method, it is characterized in that, described cellulose thickener comprises the combination of one or more in sodium carboxymethylcellulose, carboxymethyl 2-sodium hydroxyethlcellulose, carboxyethyl cellulose, methylcellulose, 2-carboxylic propyl methocel, 2-carboxyethylmethylcellulose, 2-carboxylic butyl methyl cellulose, 2-carboxyethyl ethyl cellulose and 2-carboxy-propyl cellulose.
3. steam injection oil reservoir control vapour according to claim 1 alters method, and it is characterized in that, the salinity of described formation water is 1000-100000ppm.
4. steam injection oil reservoir control vapour according to claim 1 alters method, it is characterized in that, described fiber is formed by one or both in polyester fiber and polyacrylonitrile fibre and carbon fibers, and the mass content of described carbon fiber in described fiber is greater than 50%.
5. steam injection oil reservoir according to claim 4 control vapour alters method, and it is characterized in that, wherein, the molecular weight of described polyester fiber is 18000-25000, and most high-temperature resistant temperature is 300 DEG C; The molecular weight of described polyacrylonitrile fibre is 50000-150000, and most high-temperature resistant temperature is 320 DEG C.
6. steam injection oil reservoir control vapour according to claim 1 alters method, it is characterized in that, described nano particle comprises the combination of one or more in aluminum oxide nanoparticle, magnesium oxide nanoparticle, ferric oxide nanometer particle, nickel oxide nanoparticle, Zinc oxide nanoparticle, Zirconium oxide nano grain, the monox nanometer particle of siloxane treated, Hydrophobic silica nano particle, antimony oxide nano particle and calcium oxide nano particle.
7. the steam injection oil reservoir control vapour according to claim 1 or 6 alters method, and it is characterized in that, the particle diameter of described nano particle is 1nm-1000nm.
8. steam injection oil reservoir control vapour according to claim 1 alters method, it is characterized in that, described dispersing agent is combined by one or more in triethyl group hexyl phosphoric acid, lauryl sodium sulfate, methyl anyl alcohol and guar gum and PAMC, wherein, the mass content of PAMC in described dispersing agent is greater than 20%; The molecular weight of described PAMC is 8,000,000-1,200 ten thousand.
9. steam injection oil reservoir control vapour according to claim 1 alters method, and it is characterized in that, in step one, the injection rate of described fiber solution is 100-1000 ton, and injection rate is 10-100 ton/sky.
10. steam injection oil reservoir control vapour according to claim 1 alters method, and it is characterized in that, in step 2, the injection rate of the solution of described nano particle is 100-1000 ton, and injection rate is 10-100 ton/sky.
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CN106547973A (en) * | 2016-11-02 | 2017-03-29 | 中海石油(中国)有限公司 | A kind of quantitative description of injection for heavy oil reservoir steam course channeling passage |
CN106547973B (en) * | 2016-11-02 | 2019-12-10 | 中海石油(中国)有限公司 | Quantitative description method for steam channeling channel in steam injection process of heavy oil reservoir |
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CN110305651B (en) * | 2018-03-27 | 2021-10-29 | 中国石油化工股份有限公司 | Nano particle crosslinked polymer oil displacement agent and preparation method and application thereof |
CN112943162A (en) * | 2021-03-19 | 2021-06-11 | 西南石油大学 | Method for rapidly densifying artificial partition plate of gas-water interface of bottom-edge water gas reservoir |
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