CN101173166A - Channeling-preventing agent for extra-low permeation oil accumuiation carbonic anhydride oil displacement and application thereof - Google Patents
Channeling-preventing agent for extra-low permeation oil accumuiation carbonic anhydride oil displacement and application thereof Download PDFInfo
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- CN101173166A CN101173166A CNA2007101763274A CN200710176327A CN101173166A CN 101173166 A CN101173166 A CN 101173166A CN A2007101763274 A CNA2007101763274 A CN A2007101763274A CN 200710176327 A CN200710176327 A CN 200710176327A CN 101173166 A CN101173166 A CN 101173166A
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Abstract
The invention provides a fleeing proof agent for the carbon dioxide flooding of oil reservoirs with ultra-low permeability and the application of the fleeing proof agent. The invention is characterized in that: the main agent of the fleeing proof agent is the amine substance of organic compounds; the fleeing proof agent comprises at least one amine substance and a release agent; the release agent is the ethanol comprising a certain amount of water, a hydrocarbon substance or nitrogen; the release agent is used to prevent the chemical reaction caused by the premature contact between the amine and the carbon dioxide. The invention is suitable for the gas channeling inhibition during the carbon dioxide flooding process for oil reservoirs with ultra-low permeability. The invention has the advantages that: the fleeing proof agent mainly block the gas channeling channel by the salt precipitation generated by the reaction between the carbon dioxide and the amine; the generation time of the salt precipitation is controlled by the injection volume of the release agent; the swept volume displaced by the carbon dioxide is enlarged, and the improvement of the economic benefit of carbon dioxide flooding is favored.
Description
Technical field
Enlarge the anti-migration agent that carbonic acid gas involves volume, anti-migration agent when refering in particular to extra-low permeation oil accumuiation carbonic anhydride oil displacement and application thereof when the present invention relates to carbon-dioxide flooding.
Technical background
As everyone knows, contain relatively abundanter crude oil reserve in the extra-low permeability oil reservoirs, still, extra-low permeability oil reservoirs waterflooding difficulty is big, generally relatively is suitable for the carbonic acid gas displacement.Because the nonuniformity of oil reservoir, all exist tangible gas to scurry ease in nearly all carbon-dioxide flooding process, make that the degree of carbonic acid gas expansion swept volume is limited, and common anti-channeling technology application carrier mostly is water, the general denseness of water behind the adding chemical additive increases, bigger than displacement in flooding difficulty, be difficult to realize that deep envelope scurries, cause final carbon-dioxide flooding poor effect.
Also have many oil fields to use swelling agent as agent for anti gassing-out, chemically expansible is arranged, i.e. the lattice dilatation and the expansion of getting angry also have physical expansion, promptly inflate cement.In these two kinds of methods, use the more of chemically expansible at home, and use the more of inflation abroad, see that from construction chemically expansible is easier to, but be easy to generate side effect, existing chemically expansible can not well solve the has channeling problem, and expansion is because the cement shrinkage that aquation produced in order to offset a part, after the counteracting, cement stone does not shrink and expands volume no change, this method, do not solve the problem of gelling weightlessness, grout itself does not shorten the characteristic of excessive time, does not have compensation owing to the pressure-losses that gelling produced, in this process, grout has only played basic effect, gelling weightlessness will inevitably take place, and this method is without any the measure that improves, in the anti-gas channeling process, role of grout own and its factor have not been principal element in whole process, displacement efficiency, well border situation etc. will become the absolute principal element that influences anti-channeling, so existing chemically expansible can not well solve the has channeling problem; There is viewpoint to think, chemically expansible can carry out pressure compensation in early days theing cement solidifies, to preventing that gas channeling from being favourable, but to be body of cement all expand from inside to outside for it, certainly will produce the stress distribution inequality in body of cement inside, and cause cement stone fragility to increase, and just may cause new stress distribution and destroy cement stone body by some variation of the external world, for causing, the new passage of gas entrainment generation scurries groove.Also on the books is that raw material synthesizes a kind of new anti-migration agent with polyethylene polyamine, epoxy chloropropane, Trimethylamine 99 etc., mainly carry out the core anti-channeling, the result shows, the resistance coefficient of rock core most permeable zone is risen, but the throughput ratio of high low permeability layer descends is not suitable for carbon-dioxide flooding in the extra-low permeability oil reservoirs, especially is not suitable for the oil reservoir rate of permeation and is lower than 10 * 10
-3μ m
2Extra-low permeability oil reservoirs in carbon-dioxide flooding.
Summary of the invention
In order to enlarge the swept volume of carbonic acid gas displacement, improve the carbon-dioxide flooding effect, the invention provides the anti-migration agent that a kind of extra-low permeability oil reservoirs carbon-dioxide flooding is used, this anti-migration agent can effectively suppress carbonic acid gas and scurry ease in the stratum, enlarges the swept volume of displacement of reservoir oil carbonic acid gas.
Anti-migration agent when the object of the present invention is to provide a kind of extra-low permeation oil accumuiation carbonic anhydride oil displacement, this anti-migration agent has enlarged the swept volume of the carbonic acid gas displacement of extra-low permeability oil reservoirs, improves the carbon-dioxide flooding effect.
Another object of the present invention effectively suppresses the application method of has channeling when being to provide a kind of extra-low permeation oil accumuiation carbonic anhydride oil displacement.
The object of the present invention is achieved like this:
The anti-migration agent of using during a kind of extra-low permeation oil accumuiation carbonic anhydride oil displacement is characterized in that the major ingredient of this anti-migration agent is: at least a organic amine material, and separant; Described organic amine material comprises fatty amine and their mixture, and described separant is ethanol or hydrocarbons or nitrogen.Scurry the temperature of oil reservoir according to envelope, select the suitable organic amine material of boiling point to scurry host as envelope; The thickness and the envelope of scurrying oil reservoir according to envelope scurried the degree of depth again, adjusts the weight proportion of amine substance and separant.Generally speaking, select the organic amine of boiling point, and control organic amine and separant (mass ratio) are 1: 1～50: 1 near reservoir temperature.
This anti-migration agent can effectively suppress carbonic acid gas and scurry ease in the stratum, has enlarged the swept volume of the carbonic acid gas displacement of extra-low permeability oil reservoirs, improves the carbon-dioxide flooding effect.
The carbochain of above-mentioned fatty amine partly comprises the hydrocarbon chain of straight chain and/or branched structure, and its carbonatoms is C
1-C
10Described carbochain is a saturated hydrocarbon chain.
Described organic amine material comprises monoamine, diamine or its mixture.
The amine groups of described organic amine material comprises primary amine, secondary amine, tertiary amine or its mixture.
Separant of the present invention is the ethanol of moisture 0-95% (weight), the ethanol of preferred concentration 〉=70%, the more preferably ethanol of 75-99.8%; Hydrocarbons is saturated and/or undersaturated aliphatic hydrocarbon, aromatic hydrocarbon, and carbon number is C
1-C
10, also comprise their mixture; Nitrogen wherein is common industrial nitrogen.
The present invention also provides the preparation method of the organic amine (anti-channeling host) that is used for extra-low permeation oil accumuiation carbonic anhydride oil displacement, comprising:
(1) ethamine preparation method: ethanol and liquefied ammonia (liquid amine) are at Al
2O
3Under the catalyst action, carry out aminating reaction, can make ethamine in 350～400 ℃ and 2.5～3.0MPa.
(2) diethylamine preparation method: make monochloroethane and aniline reaction, generate ethylaniline, again with the nitrous acid effect, generate nitrodiethylaniline, reaction can make diethylamine with sodium hydroxide again.
(3) triethylamine preparation method: with ethanol is raw material, in the presence of the Ni-Cu catalyzer, make ethanol and hydrogen, ammonia after the gasification under 195～200 ℃, carry out gas phase catalytic reaction, can make the mixture of monoethylamine, diethylamine, triethylamine, through separation processes such as condensation, distillations, can obtain triethylamine.
(4) quadrol preparation method: with the thanomin is raw material, carries out ammonia and separate and can make quadrol under the Co catalyst action.
(5) Isopropylamine preparation method: under the effect of nickel porous Al catalysts, under 195 ℃, 1.7MPa condition, react and make by Virahol and ammonia, hydrogen.
(6) butylamine preparation method: chlorobutane, ethanol, ammoniacal liquor are reacted under 85～95 ℃, 0.54～0.64MPa condition, after hydrochloric acid and sodium hydroxide solution are handled, make again.
The present invention also provides the preparation method of the anti-migration agent that is used for extra-low permeation oil accumuiation carbonic anhydride oil displacement, comprise: according to reservoir temperature, select the suitable anti-channeling host of utilizing method for preparing, again according to the specific requirement of constructing, select aqueous ethanol or hydrocarbons or nitrogen as separant, implement according to following application method again, generate brilliant generation of salt by the carbonic acid gas that injects in reservoir of porous medium and organic amine reaction and stop up, the anti-migration agent that above-mentioned technological process has adopted when promptly having formed carbon-dioxide flooding of the present invention.
The present invention also provides above-mentioned anti-migration agent carbonic acid gas when suppressing extra-low permeation oil accumuiation carbonic anhydride oil displacement to scurry purposes aspect the ease.
The present invention also provides the application method of the anti-migration agent that is used for extra-low permeation oil accumuiation carbonic anhydride oil displacement simultaneously, promptly, enlarge the application method that carbonic acid gas involves the anti-migration agent of volume during carbon-dioxide flooding, the ease of scurrying that suppresses carbonic acid gas when this anti-migration agent is mainly used in extra-low permeation oil accumuiation carbonic anhydride oil displacement, add the separant slug between organic amine and the carbonic acid gas slug, by adjusting the size of separant slug, the degree of depth that the control envelope is scurried.
" slug " as herein described is known professional technique term, is meant the fluid that injects the stratum porous medium, and before not spreading fully, one section fluid of shape approximation is the piston-shaped migration in hole.
In the applied extra-low permeability oil reservoirs of anti-migration agent of the present invention, the criteria for classifying of its rate of permeation meets the general accepted standard of petroleum industry, and promptly the oil reservoir rate of permeation generally is lower than 10 * 10
-3μ m
2, comprise that rate of permeation is low to moderate 0.1-5 * 10
-3μ m
2Oil reservoir.
The major advantage of technique scheme of the present invention:
1. the invention provides a kind of at least by a kind of organic amine be main body constitute with separant again extra-low permeation oil accumuiation carbonic anhydride oil displacement the time effectively suppress the anti-migration agent that carbonic acid gas is scurried ease.Because the organic amine material has very strong alkalescence, can generate corresponding salt with the carbon dioxide reaction that in oil reservoir, injects, in the relatively large duct of extra-low permeability oil reservoirs, produce salt crystal and these bigger ducts of shutoff, thereby the ease of scurrying that suppresses carbonic acid gas realizes enlarging the effect that carbonic acid gas involves volume.For extra-low permeability rate oil reservoir, the water filling difficulty is bigger, and particularly injecting with water is the envelope of carrier when scurrying agent, and difficulty is bigger; And when injecting organic amine substance, can the association clay swelling, and the viscosity ratio of amine is lower, is easier to inject oil reservoir.
2. because involving the anti-migration agent of volume, the expansion carbonic acid gas when injecting, need beat the separant slug, this separant is ethanol or hydrocarbons or nitrogen, these materials can inject oil reservoir more like a cork than water, and effective carbon dioxide sequestration contacts with the amine slug.When isolating slug in oil reservoir gradually to the deep migration and after the attenuation, organic amine just can contact with carbonic acid gas and react and generate the salt crystal, and, isolate the consumption of slug by control and just can control the position that envelope is scurried the crystal generation.Because the oil reservoir rate of permeation is low, moisture in the oil reservoir nearly all is in bound state, the moisture that is in free seepage flow state seldom, therefore, a large amount of amine salt that generate can not dissolve fully, part is trapped in the bigger duct with crystal state and produces plugging action, thereby can suppress the ease of scurrying of carbonic acid gas.
3. can screen organic amine of the present invention according to concrete reservoir condition, reservoir temperature is a main screening foundation, the boiling point of the organic amine that is screened is more near reservoir temperature, helps organic amine more and scurries the ease passage along carbonic acid gas and enter oil deposit deep part and produce envelope and scurry effect.
Embodiment
Below in conjunction with the beneficial effect that specific embodiment describes implementation process of the present invention in detail and had, understand spirit of the present invention and characteristics better to help the reader, but can not constitute any restriction practical range of the present invention.
Embodiment 1
A kind of effective inhibition carbonic acid gas of the present invention is scurried the anti-migration agent of ease.
Composition: it is quadrol that envelope is scurried host, and separant is ethanol (95% a ethanol).
117 ℃ of the boiling points of quadrol, proportion 0.899 (d
4 20), in reaching oil reservoir more than 100 ℃, temperature has very strong volatility, and its evaporable gas is scurried the passage migration of ease along carbonic acid gas, after carbonic acid gas contacts, can acid-base reaction take place and generates the salt crystal:
H
2NCH
2CH
2NH
2+ CO
2+ H
2O → (H
3NCH
2CH
2NH
3) CO
3XH
2O (crystal)
Ethanol is set as isolating slug between quadrol and carbonic acid gas, ethanol is isolated the delay that slug not only can very thorough removing carbonic acid gas, also can remove quadrol very up hill and dale, avoids the immediate vicinity of wellbore to stop up.Quadrol is scurried host as envelope, and 95% ethanol is made separant, and the ratio of the two total consumption can be quadrol by the controlling quality ratio: ethanol=1: 1～50: 1.For example, 24 tons of host slug consumptions, two separant slugs all are 6 tons (mass ratio is 2: 1), constitute a kind of effective anti-migration agent that carbonic acid gas is scurried ease that suppresses thus.
Embodiment 2
Inhibition carbonic acid gas of the present invention is scurried the application method of the anti-migration agent of ease.
Composition: organic amine is a diethylamine, and separant is a nitrogen.
Injected the carbonic acid gas of for some time in extra-low permeability oil reservoirs after, find to exist carbonic acid gas to scurry the ease phenomenon from withdrawal well, keep same injection technology parameter this moment, and the nitrogen that injects 3 days in oil reservoir is continuously set up first and isolated slug as separant (3 tons of day notes); Be converted into same volume injection speed again, injected diethylamine continuously 5 days (6 tons of day notes), the nitrogen that injects 3 days subsequently is as separant (3 tons of day notes), set up second and isolate slug, mass ratio is 1.67: 1, recovers normal injecting carbon dioxide then, and the centre does not need closing well.Host diethylamine and separant N
2Amount ratio (quality) is controlled in 1: 1～50: 1 scopes.Spread gradually at the nitrogen slug, after the thinning, the diethylamine of gasification contact with the carbonic acid gas of fore-and-aft direction in scurrying the ease passage and acid-base reaction takes place, generation salt crystalline substance is to fluid-channeling channel generation plugging action.
2 (CH
2CH
2)
2NH+CO
2+ H
2O → [(CH
2CH
2)
2NH
3]
2CO
3YH
2O (crystal)
Embodiment 3
Inhibition carbonic acid gas of the present invention is scurried the anti-migration agent sealing characteristics experiment of ease.
Experiment condition:
(1) simulating oil deposit temperature: 60 ℃.
(2) experimental water: the common injection water of taking from the oil field.
(3) carbonic acid gas: purity 99.9%, SILVER REAGENT.
(4) physical model: ( 2.5 * 30cm), rate of permeation 0.5 * 10 for the extra-low permeability model pipe of the fixed sand of appearing
-3μ m
2
(5) anti-migration agent: diethylamine (industrial goods, 55.9 ℃ of boiling points).
(6) separant: the ethanol of content 95%.
(7) pressure measuring system: computer expert's excess pressure transmitter automatic pressure acquisition changing value (homemade).
(8) injection pump: homemade constant speed injection pump.
Experiment purpose: in the physical model of the normal reservoir condition of simulation, investigate the envelope of this anti-migration agent after carbon dioxide injection is scurried ease and scurry effect.
Experimental arrangement and result: first water filling in the physical model of saturated local water, the steady pressure that test is injected, carbonic acid gas reinjects, measure outlet and bring out the steady pressure that injects when existing carbonic acid gas is scurried ease, inject 95% ethanol of 10ml and isolate the steady pressure of slug and record injection as first, inject the host diethylamine of 25ml and the steady pressure that record injects, 95% ethanol that injects 10ml is as second steady pressure of isolating slug and record injection, the steady pressure that normal injecting carbon dioxide and record inject.Experimental result sees Table 1.
Table 1
| Slug injection order | The injection project | Injection mode or injection rate | Injection pressure | Injection pressure changing value during than water filling |
| 1 | The physical model water filling of saturated local water | Continuously | 19 | / |
| 2 | Injecting carbon dioxide | Continuously | 4.8 | -74.7 |
| 3 | Inject first and isolate slug ethanol | 10ml | 5.6 | -70.5 |
| 4 | Inject diethylamine host slug | 25ml | 9.8 | -48.4 |
| 5 | Inject second and isolate slug ethanol | 10ml | 10.2 | -46.3 |
| 6 | Normal injecting carbon dioxide | Continuously | 35 | +84.2 |
Interpretation:
In rate of permeation is 0.5 * 10
-3μ m
2Extra-low permeability rate physical model in, almost can't water filling, water injection pressure is up to 19MPa in the model of 30cm; Begin injecting carbon dioxide this moment, scurry ease when taking place when exit end, injection pressure is stabilized in 4.8MPa, has descended 74.8% than the water filling stage, the extra-low permeability oil reservoirs that the water filling difficulty is described is more suitable for gas injection, scurries the ease phenomenon and back pressure occurs and obviously reduce but also can regard as; Begin to inject first and isolate slug, injection pressure rises to some extent, because of injection rate seldom, so resulting pressure is still very low, only reach 5.6MPa, than the water filling stage low 70.5%; Then inject anti-channeling host quadrol slug, this moment, injection pressure continued to rise to some extent, reached 9.8MPa, but still than water filling stage reduction by 48.4%; Slug is isolated in follow-up injection second, and injection pressure remains unchanged substantially; Recover injecting carbon dioxide, this moment, injection pressure rapidly increased to 35MPa, and the pressure during considerably beyond the early stage water filling reaches 84.2%, illustrate that the anti-migration agent of injection has been brought into play effect, has produced powerful plugging effect.
Embodiment 4
Inhibition carbonic acid gas of the present invention is scurried the anti-migration agent sealing characteristics experiment of ease.
Experiment condition:
(1) simulating oil deposit temperature: 105 ℃.
(2) experimental water: the common injection water of taking from the oil field.
(3) carbonic acid gas: purity 99.9%, SILVER REAGENT.
(4) physical model: ( 2.5 * 100cm), rate of permeation 3.3 * 10 for the extra-low permeability model pipe of the fixed sand of appearing
-3μ m
2
(5) anti-migration agent: quadrol (industrial goods, 117 ℃ of boiling points).
(6) separant: 95% ethanol.
(7) pressure measuring system: computer automatic pressure acquisition changing value (homemade).
(8) injection pump: homemade constant speed injection pump.
Experiment purpose: in the physical model of the normal reservoir condition of simulation, the envelope that the investigation carbon dioxide injection is scurried after the ease is scurried effect.
Experimental arrangement and result: first water filling in the physical model of saturated local water, the steady pressure that test is injected, again with fast injecting carbon dioxide, measure outlet and bring out the steady pressure that injects when existing carbonic acid gas is scurried ease, inject 95% ethanol of 25ml under the identical speed and isolate the steady pressure of slug and record injection as first, inject the host quadrol of 60ml and the steady pressure that record injects with speed, 95% ethanol with the fast 25ml of injection is isolated the also steady pressure of record injection of slug as second, and last normal injecting carbon dioxide is the steady pressure of record injection also.Experimental result sees Table 2.
Table 2
| Slug injection order | The injection project | Injection mode or injection rate (ml) | CIP MPa | Injection pressure changing value rate (%) during than water filling |
| 1 | The physical model water filling of saturated local water | Continuously | 13 | / |
| 2 | Injecting carbon dioxide | Continuously | 3.4 | -73.8 |
| 3 | Inject first and isolate slug ethanol | 25 | 3.8 | -70.7 |
| 4 | Inject quadrol host slug | 60 | 6.6 | -49 |
| 5 | Inject second and isolate slug ethanol | 25 | 6.6 | -49 |
| 6 | Normal injecting carbon dioxide | Continuously | 25 | +92 |
Interpretation:
In rate of permeation is 3.3 * 10
-3μ m
2Extra-low permeability rate physical model in water filling, injection pressure is very high, reaches 13MPa; Begin injecting carbon dioxide this moment, scurries ease when taking place when exit end, and injection pressure is stabilized in 3.4MPa, descended 73.8% than the water filling stage, illustrates that extra-low permeability oil reservoirs is suitable for gas injection, but it is very serious to scurry ease; Begin to inject first and isolate slug, injection pressure slightly rises, because of injection rate seldom, so resulting pressure is still very low, only reach 3.8MPa, than the water filling stage low 70.7%; Then inject anti-channeling host quadrol slug, this moment, injection pressure continued to rise to some extent, reached 6.6MPa, but still than water filling stage reduction by 49.0%; Slug is isolated in follow-up injection second, and injection pressure remains unchanged substantially; Recover injecting carbon dioxide, this moment, injection pressure rapidly increased to 25MPa, and the pressure during considerably beyond the early stage water filling reaches 92%, illustrate that the anti-migration agent of injection has been brought into play effect, has produced powerful plugging effect.
Embodiment 5
Inhibition carbonic acid gas of the present invention is scurried the anti-migration agent sealing characteristics experiment of ease.
Experiment condition:
(1) simulating oil deposit temperature: 78 ℃.
(2) experimental water: the common injection water of taking from the oil field.
(3) carbonic acid gas: purity 99.9%, SILVER REAGENT.
(4) physical model: ( 2.5 * 200cm), rate of permeation 5.6 * 10 for the extra-low permeability model pipe of the fixed sand of appearing
-3μ m
2
(5) anti-migration agent: butylamine (industrial goods, 77 ℃ of boiling points).
(6) separant: industrial nitrogen (95% purity).
(7) pressure measuring system: computer automatic pressure acquisition changing value (homemade).
(8) injection pump: homemade constant speed injection pump.
Experiment purpose: in the physical model of the normal reservoir condition of simulation, the envelope that the investigation carbon dioxide injection is scurried after the ease is scurried effect.
Experimental arrangement and result: first water filling in the physical model of saturated local water, the steady pressure of test water filling injects CO with speed again
2, measure exit end and find to inject when carbonic acid gas is scurried ease CO
2Steady pressure; Under identical speed, inject the N of 30ml earlier
2Isolate slug and write down pressure as first, the steady pressure that the host benzene methanamine of the 100ml that reinjects and record inject, the N of the 25ml that reinjects
2As second steady pressure of isolating slug and record injection, the steady pressure of last normal injecting carbon dioxide and record injection.Experimental result sees Table 3.
Table 3
| Slug injection order | The injection project | Injection mode or injection rate (ml) | CIP MPa | Injection pressure changing value rate (%) during than water filling |
| 1 | The physical model water filling of saturated local water | Continuously | 18.7 | / |
| 2 | Injecting carbon dioxide | Continuously | 5.2 | -72.2 |
| 3 | Inject first and isolate slug N 2 | 30 | 5.1 | -72.7 |
| 4 | Inject butylamine host slug | 100 | 8.1 | -56.7 |
| 5 | Inject second and isolate slug N 2 | 25 | 7.2 | -61.5 |
| 6 | Normal injecting carbon dioxide | Continuously | 35.8 | +90.4 |
Interpretation:
In rate of permeation is 5.6 * 10
-3μ m
2Extra-low permeability rate physical model in water filling, injection pressure is very high, reaches 18.7MPa; Begin injecting carbon dioxide this moment, scurries ease when taking place when exit end, and injection pressure is stabilized in 5.2MPa, descended 72.2% than the water filling stage, illustrates that extra-low permeability oil reservoirs is suitable for gas injection, but it is very serious to scurry ease; Begin to inject first and isolate slug N
2, injection pressure slightly descends, because of injection rate seldom, so resulting pressure is still very low, only reach 5.1MPa, lower by 72.7% than the water filling stage; Then inject anti-channeling host benzene methanamine slug, this moment, injection pressure rose to some extent, reached 8.1MPa, but still than water filling stage reduction by 56.7%; Slug N is isolated in follow-up injection second
2, injection pressure slightly descends, and reaches 7.2MPa; Recover injecting carbon dioxide, this moment, injection pressure rapidly increased to 35.8MPa, the pressure 90.4% during considerably beyond the early stage water filling.Obviously, the anti-migration agent benzene methanamine of injection with CO
2Reaction also generates the solid tamper, has brought into play powerful plugging action.
Embodiment 6
Inhibition carbonic acid gas of the present invention is scurried the anti-migration agent sealing characteristics experiment of ease.
Experiment condition:
(1) simulating oil deposit temperature: 35 ℃.
(2) experimental water: the common injection water of taking from the oil field.
(3) carbonic acid gas: purity 99.9%, SILVER REAGENT.
(4) physical model: ( 2.5 * 200cm), rate of permeation 4.8 * 10 for the extra-low permeability model pipe of the fixed sand of appearing
-3μ m
2
(5) anti-migration agent: Isopropylamine (industrial goods, 33 ℃ of boiling points).
(6) separant: Sweet natural gas (95% purity).
(7) pressure measuring system: computer automatic pressure acquisition changing value (homemade).
(8) injection pump: homemade constant speed injection pump.
Experiment purpose: in the physical model of the normal reservoir condition of simulation, the envelope that the investigation carbon dioxide injection is scurried after the ease is scurried effect.
Experimental arrangement and result: first water filling in the physical model of saturated local water, the steady pressure of test water filling injects CO with speed again
2, measure exit end and find to inject when carbonic acid gas is scurried ease CO
2Steady pressure; Under identical speed, injecting the Sweet natural gas of 30ml earlier isolates slug and writes down injection pressure as first, the host Isopropylamine of 150ml and the steady pressure that record injects reinject, the Sweet natural gas of 30ml of reinjecting is isolated the steady pressure that slug and record inject, the steady pressure that last normal injecting carbon dioxide and record inject as second.Experimental result sees Table 4.
Table 4
| Slug injection order | The injection project | Injection mode or injection rate (ml) | CIP MPa | Injection pressure changing value rate (%) during than water filling |
| 1 | The physical model water filling of saturated local water | Continuously | 20.6 | / |
| 2 | Injecting carbon dioxide | Continuously | 6.1 | -70.4 |
| 3 | Inject first and isolate slug | 30 | 6.2 | -69.9 |
| 4 | Inject Isopropylamine host slug | 150 | 9.0 | -56.3 |
| 5 | Inject second and isolate slug | 30 | 8.1 | -60.7 |
| 6 | Normal injecting carbon dioxide | Continuously | 39.6 | +92.2 |
Interpretation:
In rate of permeation is 4.8 * 10
-3μ m
2Extra-low permeability rate physical model in water filling, injection pressure is very high, reaches 20.6MPa; Begin injecting carbon dioxide this moment, scurries ease when taking place when exit end, and injection pressure is stabilized in 6.1MPa, descended 70.4% than the water filling stage, illustrate that extra-low permeability oil reservoirs is suitable for gas injection, but the ease problem scurried in existence; Begin to inject first this moment and isolate the slug Sweet natural gas, injection pressure slightly rises, because of injection rate seldom, so resulting pressure is still very low, only reach 6.2MPa, than the water filling stage low 69.9%; Then inject anti-channeling host Isopropylamine slug, this moment, injection pressure rose to some extent, reached 9.0MPa, but still than water filling stage reduction by 56.3%; The slug Sweet natural gas is isolated in follow-up injection second, and injection pressure slightly descends, and reaches 8.1MPa; Recover injecting carbon dioxide, this moment, injection pressure rapidly increased to 39.6MPa, the pressure 92.2% during considerably beyond the early stage water filling.Obviously, the anti-migration agent Isopropylamine of injection with CO
2Reaction, and in rock core, generate the solid salt crystalline substance, produce ponding, bring into play powerful envelope and scurried effect.
The present invention adopts the Different concentrations of alcohol of 75%-99.8% as separant, and other parameter conditions and embodiment 1 have obtained identical or similar good result together.
Claims (10)
1. anti-migration agent, it is characterized in that, the composition of this anti-migration agent is organic amine material and separant, wherein, described organic amine material comprises fatty amine or its mixture, described separant is ethanol, hydrocarbons or nitrogen, and the mass ratio of organic amine material and separant is 1: 1～50: 1.
2. anti-migration agent as claimed in claim 1 is characterized in that, the hydrocarbon chain carbonatoms of described fatty amine is C
1-C
10
3. anti-migration agent as claimed in claim 2 is characterized in that, described organic amine material comprises monoamine, diamine or its mixture.
4. anti-migration agent as claimed in claim 3 is characterized in that, the amine groups of described organic amine material comprises primary amine, secondary amine, tertiary amine or its mixture.
5. anti-migration agent as claimed in claim 1 is characterized in that, described separant is an ethanol, and this concentration of ethanol is at least 5%.
6. anti-migration agent as claimed in claim 1 is characterized in that, described separant is a hydrocarbons, and it is carbon number C
1-C
10Saturated hydro carbons, aromatic hydrocarbon or its mixture.
7. anti-migration agent as claimed in claim 1 is characterized in that, described separant is a nitrogen.
8. the described anti-migration agent of claim 1 carbonic acid gas when suppressing extra-low permeation oil accumuiation carbonic anhydride oil displacement is scurried the purposes aspect the ease.
9. purposes as claimed in claim 8 is characterized in that the rate of permeation of described extra-low permeability oil reservoirs is lower than 10 * 10
-3μ m
2
10. the application method of anti-migration agent as claimed in claim 1, it is characterized in that, when being used for extra-low permeation oil accumuiation carbonic anhydride oil displacement, suppresses this anti-migration agent scurrying when escaping of carbonic acid gas, between organic amine slug and carbonic acid gas, add the separant slug, by adjusting the size of separant slug, the degree of depth that the control envelope is scurried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101763274A CN100519688C (en) | 2007-10-25 | 2007-10-25 | Channeling-preventing agent for extra-low permeation oil accumuiation carbonic anhydride oil displacement and application thereof |
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| CN105003234A (en) * | 2014-04-17 | 2015-10-28 | 中国石油化工股份有限公司 | Novel method for judging gas channeling of carbon dioxide drive reservoir |
| CN105484697A (en) * | 2015-12-22 | 2016-04-13 | 中国石油天然气股份有限公司 | Profile control channeling sealing method for super heavy oil reservoir |
| CN107435532A (en) * | 2016-05-27 | 2017-12-05 | 中国石油化工股份有限公司 | One kind utilizes CO2Response surface activating agent controls CO2The method that purging is altered |
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| CN116376532A (en) * | 2023-01-31 | 2023-07-04 | 西南石油大学 | Carbon dioxide foam flooding channeling-preventing agent suitable for fractured ultralow permeability reservoir and application thereof |
| CN116285934B (en) * | 2023-01-31 | 2024-05-28 | 西南石油大学 | Gel channeling inhibitor suitable for expanding sweep volume of carbon dioxide flooding of ultralow permeability reservoir and application thereof |
| CN116376532B (en) * | 2023-01-31 | 2024-06-07 | 西南石油大学 | Carbon dioxide foam flooding channeling-preventing agent suitable for fractured ultralow permeability reservoir and application thereof |
| CN118029954A (en) * | 2024-03-19 | 2024-05-14 | 中国石油大学(华东) | Channeling sealing method for inter-well channeling channels in gas-drive oil reservoir |
| CN118029954B (en) * | 2024-03-19 | 2024-09-06 | 中国石油大学(华东) | Channeling sealing method for inter-well channeling channels in gas-drive oil reservoir |
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