CN105154055B - A kind of ultralow interfacial tension foam flooding system and its application method - Google Patents

A kind of ultralow interfacial tension foam flooding system and its application method Download PDF

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CN105154055B
CN105154055B CN201510495995.8A CN201510495995A CN105154055B CN 105154055 B CN105154055 B CN 105154055B CN 201510495995 A CN201510495995 A CN 201510495995A CN 105154055 B CN105154055 B CN 105154055B
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foam
interfacial tension
oil
volume
ultralow interfacial
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CN105154055A (en
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杜勇
赵军梅
张蕾
张佩
田波
滕学伟
钱钦
贾耀勤
侯洪涛
宾永锋
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Zhuangxi Oil Extraction Plant
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Zhuangxi Oil Extraction Plant
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/594Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/584Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants

Abstract

The present invention provides a kind of ultralow interfacial tension foam flooding system and its application method, the oil displacement system are mixed by the raw material of following percentage by weight:Foaming agent 0.1 0.3%, inorganic reagent 0.05 0.15%, foam stabilizer 0.01 0.10%, water surplus.Described foaming agent is dodecyldimethylammonium hydroxide inner salt, dodecyl hydroxy sulfo lycine, dodecyl hydroxypropyl sulfobetaines, dodecanamide propyl hydroxy sulfo lycine, lauroylamidopropyl betaine, cocamidopropyl propyl amide amine oxide, Shuangzi tertiary amine oxide, polyoxyethylene lauryl alcohol ether sulfuric ester salt or lauryl sodium sulfate;Described inorganic reagent is sodium hydroxide, natrium carbonicum calcinatum or kodalk;Described foam stabilizer is partially hydrolyzed polyacrylamide (PHPA) HPAM, acrylamide copolymer, carboxymethyl cellulose PACHV or hydroxypropyl methyl cellulose HPMC.

Description

A kind of ultralow interfacial tension foam flooding system and its application method
Technical field
The invention belongs to tertiary oil production in oil field technology, and in particular to a kind of ultralow interfacial tension foam flooding system and its make Use method.
Background technology
For oil reservoir after long-term injecting water is developed, stratum easily forms hypertonic water breakthrough passage, and injection water is easy to along macropore side To unidirectionally advancing by leaps and bounds, channelling phenomenon is caused to occur.Depth profile control must be carried out to expand swept volume, make injection water enter in, it is low Infiltration layer, while play the effect for improving displacement efficiency.Foam is because of its higher apparent viscosity and " the not stifled aperture of stifled macropore, water blockoff are not The characteristic of the selective shut-off of stifled oil ", can adjust intake profile, increase water drive swept volume.In addition, excellent foam system Oil water interfacial tension can be greatly lowered, emulsify remaining oil, improve displacement efficiency.Thus foam flooding technology can be carried significantly High recovery rate.
At present, known foaming compositions and foam flooding method mainly have following several:Patent document 201010562580.5 disclosing a kind of foam enhancing polymer oil-displacing agent and flooding method, wherein surfactant is dodecane Base sodium sulphate, dodecyl sodium sulfate, neopelex etc., polymer are partially hydrolyzed polyacrylamide (PHPA), hydrophobic formed Close polymer, amphiphilic polymers etc..Patent document 201210323309.5 discloses a kind of using foam compound system exploitation oil The method of field residual crude oil, foam compound system are made up of NaOH, surfactant, partially hydrolyzed polyacrylamide (PHPA).Patent text Offer CN201010521953.4 and disclose a kind of temperature-resistant anti-salt low-tension foam flooding finish and preparation method thereof, by alkanolamide, Bipolarity based surfactants and water, continued stirring until at 40-60 DEG C be completely dissolved it is obtained.Patent document 201210191135.1 is a kind of suitable for oil field profile control and foam system and a kind of flooding method of the displacement of reservoir oil, wherein surfactant For perfluoroalkyl ethers alcohol amine salt or double alkylamide APEOs, foam stabilizer is that ammonium stearate or dodecyl dimethyl aoxidize Ammonium, thickener are poly table agent or polyacrylamide, and inorganic salts are sodium chloride, sodium sulphate, sodium acid carbonate, sodium carbonate, potassium chloride, chlorine Change one or more of mixtures of calcium and magnesium chloride.
Known foam system, first two foam system only have preferable foaming properties, but not up to ultralow interfacial tension, It is relatively low that it improves the effect of oil displacement efficiency;Latter two foam system is not evaluated the oil resistance of foam.Thus, it there is no comprehensive Close the foam flooding system formulation of function admirable.
The content of the invention
It is contemplated that overcome the deficiencies in the prior art, the first purpose is to provide a kind of ultralow interfacial tension foam flooding oil body System, the foam flooding system have ultralow interfacial tension, oil resistance good.In addition, with preferable frothing capacity, emulsibility Energy, stability, displacement section can be adjusted, increase swept volume, reduce oil water interfacial tension, improved displacement efficiency, enter one Step improves recovery ratio;The second purpose is to provide the application method of the ultralow interfacial tension foam flooding system.
An object of the present invention can be achieved by the following technical measures:
The ultralow interfacial tension foam flooding system is mixed by the raw material of following percentage by weight:
Foaming agent 0.1-0.3% inorganic reagents 0.05-0.15%
Foam stabilizer 0.01-0.10% water surplus;
Described foaming agent is dodecyldimethylammonium hydroxide inner salt (amphoteric), dodecyl hydroxy sulfo lycine (both sexes Type), dodecyl hydroxypropyl sulfobetaines (amphoteric), dodecanamide propyl hydroxy sulfo lycine (amphoteric), lauroyl Amine CAB (amphoteric), cocamidopropyl propyl amide amine oxide (amphoteric), Shuangzi tertiary amine oxide (double type), polyoxyethylene Lauryl alcohol ether sulfuric ester salt (anion-nonionic type) or lauryl sodium sulfate (anionic);
Described inorganic reagent is sodium hydroxide, natrium carbonicum calcinatum or kodalk;
Described foam stabilizer is partially hydrolyzed polyacrylamide (PHPA) HPAM, acrylamide copolymer, carboxymethyl cellulose PACHV Or hydroxypropyl methyl cellulose HPMC.
An object of the present invention can be also achieved by the following technical measures:
Further, described foaming agent is dodecyl hydroxypropyl sulfobetaines DSB-12.
Further, described inorganic reagent is kodalk NaBO2
Further, described foam stabilizer is hydroxypropyl methyl cellulose HPMC.
The second object of the present invention can be achieved by the following technical measures:
Above-mentioned ultralow interfacial tension foam flooding system and gas are taken, according to ultralow interfacial tension foam flooding system: Gas=1~2:2~1 volume ratios are injected into stratum simultaneously;Described gas is nitrogen, carbon dioxide, air or flue gas, The volume of the gas presses formation pressure calculation;The ultralow interfacial tension foam flooding system of injection and the cumulative volume of gas are oil reservoir The 5%~50% of total pore size volume.
The second object of the present invention can be also achieved by the following technical measures:
Further, described gas is nitrogen.
Further, described ultralow interfacial tension foam flooding system and the volume ratio of gas are 1.4~1.6:1.6~ 1.4。
Further, the cumulative volume of the ultralow interfacial tension foam flooding system of described injection and gas is oil reservoir total pore space The 10%~30% of volume.
Following experiment has been done in the foam flooding system sampling of the present invention:
The crude oil of Shengli Oil Field oil-producing region is taken, oil-producing region stratum sewage, the salinity 9842mg/L, experimental temperature 70 ℃。
Experimental example 1:The frothing capacity of foaming agent
Using the performance of Waring-Blender methods evaluation foam.Waring-Blender paddling process is in certain rotating speed Under the bubbling system of certain volume is stirred, produce foam and simultaneously determine frothing capacity, this method is easy to operate, experimental result It is frothing capacity evaluation method more conventional in current laboratory with preferable repeatability.Specific behaviour in experimentation It is as follows to make step:It is molten with waste water concentration 0.2wt% foaming agent that 100mL is added into Waring-Blender jars Liquid, 60s is stirred with constant speed (2000r/min) during experiment, caused foam is poured into rapidly in 1000mL graduated cylinders, record is just Beginning foam volume is the foaming volume of foaming agent.With the passage of time, defoaming and coalescence due to foam, liquid constantly separates out, The time required for discharge 50mL liquid in foam is recorded, to weigh the analysis liquid half-life period of foam stability, 70 DEG C of experimental temperature.
The frothing capacity of 1 different foaming agents of table
As can be seen from Table 1, when concentration is 0.2wt%, the frothing capacity of dodecyl hydroxypropyl sulfobetaines is most Good, foaming volume 580mL, analysis liquid half-life period is 183s.It is preferred that foaming agent is dodecyl hydroxypropyl sulfobetaines.
Determine foaming volume, the analysis liquid half-life period of various concentrations foaming agent dodecyl hydroxypropyl sulfobetaines, knot Fruit is shown in Table 2.As can be seen that the foaming, foam stability energy when concentration is 0.2wt% are best, preferably foaming agent concentration is 0.2wt%.
The foaming of the various concentrations foaming agent dodecyl hydroxypropyl sulfobetaines of table 2, foam stability energy
Experimental example 2:The oil resistance of foam flooding system
Scheme one (miscella foaming):By the dodecyl hydroxypropyl sulfobetaines aqueous slkali that 100mL concentration is 0.2wt% In plus different volumes kerosene after, using Waring Blender agitators constant speed stir 1 minute, move into 1000mL graduated cylinders in, Graduated cylinder is placed in 70 DEG C of cleansing bath tubs, records foaming volume, analyses liquid half-life period.
3 different oil contents of table bubble to foaming agent, the influence of foam stability energy
Addition kerosene is analogous to foam and-reproduction condition is generated-vanished in formation core before stirring.As can be seen from Table 3, After adding 10mL kerosene, the foaming volume of foaming agent dodecyl hydroxypropyl sulfobetaines reduces by 1.72%, and foaming volume becomes Change is smaller, shows that the oil resistivity of the foaming agent is preferable.Liquid Increased Plasma Half-life 12.02% is analysed, this is due to breast of the foaming agent to oil Change effect is good, and it is oil droplet to make oil dispersed, is gathered in Plateau borders, forms pseudo-emulsion film, thickness of liquid film increase, and stability increases By force, half-life period increases.
Scheme two (foam meets oil):The dodecyl hydroxypropyl sulfobetaines aqueous slkali that 100mL concentration is 0.2wt% is adopted Stirred 1 minute, moved into 1000mL graduated cylinders with Waring Blender agitators constant speed, then be placed in 70 DEG C of cleansing bath tubs, rapidly The kerosene 20mL got ready is added, reads foaming volume, measurement analysis liquid half-life period.
Foaming, stability after the foam of table 4 chance oil
Kerosene is added after stirring and is analogous to stability of the injection foam in stratum chance oil.As can be seen from Table 4, the method is surveyed Fixed all foaming agents, foaming volume and analysis liquid half-life period change are little, and half foam life period has a great influence.Mainly due to kerosene It is not emulsified well, the oil for being seeped into gas-liquid interface is sprawled rapidly on liquid film surface, is caused foam to be vanished rapidly, is shown as steeping Foam half-life period reduces.
Comprehensive two schemes, the foam of preferable dodecyl hydroxypropyl sulfobetaines generation have preferable oil resistant Property.
Experimental example 3:The interfacial tension performance of foaming agent
Experiment uses U.S. TX500C type rotating interfacial tensimeters, and is gathered at interval of certain time by camera Oil droplet picture, is recorded and is calculated with special-purpose software, so as to obtain the data of real-time interfacial tension.
By calculating, the interfacial tension of independent 0.2wt% dodecyls hydroxypropyl sulfobetaines is 0.02mN/m, is added 0.1wt% kodalks (NaBO2) afterwards the interfacial tension of foaming agent solution be 0.008mN/m, reach ultralow interfacial tension.Mainly It is because kodalk reacts with crude oil, cooperative effect occurs for product and the dodecyl hydroxypropyl sulfobetaines of generation, enters One step reduces interfacial tension.
Experimental example 4:The emulsifiability of foaming agent
Compound concentration is the foaming agent solution of 0.1wt%, 0.2wt% dodecyl hydroxypropyl sulfobetaines, and 10mL has Fill in and add 5mL foaming agent solutions, 5mL oil fields oil sample in test tube;After preheating 5min in 70 DEG C of water-baths of reservoir temperature, uniformly firmly up and down Under concussion 50, about half a minute, then be placed in water-bath, point water of different time is recorded, calculates diversion ratio.
Experimental example 5:Foam flooding stable system performance
The stability of foam is the key whether relation foam can produce good sealing characteristics in the earth formation.Independent ten Though dialkyl group hydroxypropyl sulfobetaines is with higher foamability, foam stability is relatively low at the formation temperature, it is necessary to Go out while have the compound system of preferable foamability and foam stabilizing ability by compound screening, this can be by adding foam stabilizer reality It is existing.
Influences of the various concentrations hydroxypropyl methyl cellulose HPMC of table 5 to foaming agent stability
As can be seen from Table 5, after adding foam stabilizer hydroxypropyl methyl cellulose HPMC, the stability of foam system increases By force.With the rise of foam stabilizer mass fraction, analysis liquid half-life period rise, the foaming volume of system declines.Because to foaming agent After middle addition polymer, the increase of compound system viscosity, so as to reduce the loss of liquid in bubble film, it is strong to add liquid film Degree, and solubility of the gas in liquid film is greatly reduced, so as to reduce the gas permeability of liquid film so that compound system it is steady It is qualitative to greatly increase.But polymer quality fraction is excessive so that system viscosity is excessive, foaming difficulty increase.Consider, select Concentration be 0.05wt% foam stabilizer it is more suitable, now the foaming volume of foam system be 550mL, analyse liquid half-life period be 230s。
It is dodecyl hydroxypropyl sulfobetaines by the preferred ultralow interfacial tension foam systems of experimental example 1-5 0.2wt%+ kodalk 0.1wt%+ hydroxypropyl methyl celluloses 0.05wt%.
Experimental example 6:The closure of foam flooding system, anti-gas channeling performance
Using the closure of fill out sand tube experimental evaluation foam, anti-gas channeling performance.The resistance coefficient of foam is directed to core model Middle note foam system, the foam system ratio of core both ends pressure difference with aqueous vapor with pressure difference when noting when core migration reaches balance (water now is free from the stratum water of surfactant).The resistance factor of foam is directed to note foam system in core model, The ratio of foam system core both ends pressure difference and pressure difference during straight waterflooding when core migration reaches balance.By resistance coefficient, resistance Measurement of the big I of the power factor as the anti-gas channeling ability of foam in pore media, resistance coefficient, the resistance factor of foam are bigger, It is blocked, anti-gas channeling ability is about strong, and sweep efficiency is bigger.
Experiment flow is that wet method prepares fill out sand tube first, and liquid surveys its permeability, is added into intermediate receptacle tank using stake west The foaming agent solution that oilfield sewage is prepared, it is fully warmed-up in the baking oven of 70 DEG C of reservoir temperature of setting, saturation stratum water, measure ground Pressure difference layer water and gas different proportion inject simultaneously when, then pressure when determining foaming agent solution and gas different proportion while injecting Difference.(back pressure is 2MPa, flow velocity 1mL/min.) the experiment 201- that Parker Hannifin companies of the U.S. produce FKASVBAA gas mass flows gauge controls gas flow.
The fill out sand tube back-up sand data of table 6
The resistance factor measurement result of table 7
Pass through experiment, gas liquid ratio 1:When 1, the resistance coefficient of preferable foam system can reach 20.9, and resistance factor is reachable To 478, foam can produce good shut-off capacity, improve the swept volume of sequent water flooding.
Experimental example 7:The Oil Displacing Capacity of foam flooding system
Using the Oil Displacing Capacity of fill out sand tube physical simulation experiment evaluation foam.
Experimental procedure is as follows:
(1) for sand-filling tube model (back-up sand length of tube 30cm), after first filling up sand with the wet method of filling out, then displacement in flooding at a slow speed, Until being weighed after pressure is steady, subtract model weight and insert sand and produce out pore volume again;
(2) at 70 DEG C, rock core 2PV is replaced with simulated formation water drive;
(3) at 70 DEG C, constant temperature saturated oils, initial oil saturation is calculated;
(4) with simulated formation water drive for fill out sand tube until production fluid moisture content is more than 98%, calculate water drive cumulative oil recovery factor, Stage moisture content and corresponding pressure change;
(5) by foam system solution (dodecyl hydroxypropyl sulfobetaines 0.2wt%+ kodalk 0.1wt%+ hydroxyls Propyl methocel 0.05wt%) and certain flow gas (gas liquid ratio 1:1) while foam maker is injected, opens emptying Pipeline valve, under certain back pressure emptying to foam it is uniform after reinject model, continue thereafter with simulated formation water drive to output Liquid moisture content is more than 98% (with production fluid volume metering);
(6) experiment production fluid is demulsified, and calculates the cumulative oil recovery factor of oil displacement experiment, stage moisture content etc..
The fill out sand tube back-up sand data of table 8
The invention has the advantages that:
(1) the foam flooding system can make the interfacial tension of viscous crude be down to 0.008mN/m, reach ultralow interfacial tension, With higher displacement efficiency.
(2) the foam flooding system oil resistance is preferable, and foam is relatively stablized after meeting oil, and frothing capacity is substantially unaffected.
(3) the foam flooding system emulsifiability is good, it is possible to increase the swept volume of subsequent fluid.
The foam flooding system of the present invention has ultralow interfacial tension, preferable frothing capacity, emulsifiability, oil resistivity Energy, stability, the resistance factor of foam is larger, can produce good shut-off capacity, improves the swept volume of sequent water flooding And displacement efficiency.
Brief description of the drawings
Fig. 1 is the emulsifiability schematic diagram of 0.1wt%, 0.2wt% foam and emulsification of crude oil;
As seen from Figure 1,0.1wt%, 0.2wt% foam and emulsification of crude oil effect are preferable, with the extension of time, rising The solution concentration of infusion reduces, and divides water speed very fast, and demulsification processing follow-up on Produced Liquid influences smaller.
Fig. 2 is the Oil Displacing Capacity schematic device using fill out sand tube physical simulation experiment evaluation foam;
Wherein:(1) gas cylinder (2) booster pump (3) high pressure storage tank (4) gas mass flow amount control system (5) constant-flux pump (6) insulating box (7) oil tank (8) water pot (9) foam maker (10) atmospheric valve (11) fill out sand tube (12) back-pressure valve (13) Production fluid metering system (14) pressure acquisition system (15) hand force (forcing) pump
The Oil Displacing Capacity of Fig. 3 foam systems.
As seen from Figure 3, after adding foam system, foam blocking effect is preferable, and the rise of displacement pressure difference is more apparent, subsequently Water drive power raises, and production fluid moisture content declines, and foam flooding recovery ratio improves 16.81%, and oil displacement efficiency is preferable.
Embodiment
Embodiment 1:
The ultralow interfacial tension foam flooding system of the present invention is mixed by the raw material of following percentage by weight:
The sodium hydroxide 0.15% of dodecyldimethylammonium hydroxide inner salt (amphoteric) 0.1%
The water surplus of acrylamide copolymer 0.01%.
Ultralow interfacial tension foam flooding system and carbon dioxide are taken, according to ultralow interfacial tension foam flooding system:Two Carbonoxide=1:2 volume ratios are injected into stratum simultaneously;The volume of described carbon dioxide presses formation pressure calculation;Injection Ultralow interfacial tension foam flooding system and carbon dioxide cumulative volume be oil reservoir total pore size volume 5%.
Embodiment 2:
The ultralow interfacial tension foam flooding system of the present invention is mixed by the raw material of following percentage by weight:
The sodium hydroxide 0.05% of dodecyldimethylammonium hydroxide inner salt (amphoteric) 0.3%
The water surplus of acrylamide copolymer 0.10%.
Ultralow interfacial tension foam flooding system and carbon dioxide are taken, according to ultralow interfacial tension foam flooding system:Two Carbonoxide=2:1 volume ratio is injected into stratum simultaneously;The volume of described carbon dioxide presses formation pressure calculation;Injection Ultralow interfacial tension foam flooding system and carbon dioxide cumulative volume be oil reservoir total pore size volume 50%.
Embodiment 3:
The ultralow interfacial tension foam flooding system of the present invention is mixed by the raw material of following percentage by weight:
The sodium hydroxide 0.05% of dodecyldimethylammonium hydroxide inner salt (amphoteric) 0.3%
The water surplus of acrylamide copolymer 0.10%.
Ultralow interfacial tension foam flooding system and carbon dioxide are taken, according to ultralow interfacial tension foam flooding system:Two Carbonoxide=1.4:1.6 volume ratios are injected into stratum simultaneously;The volume of described carbon dioxide presses formation pressure calculation; The ultralow interfacial tension foam flooding system of injection and the cumulative volume of carbon dioxide are the 30% of oil reservoir total pore size volume.
Embodiment 4:
The ultralow interfacial tension foam flooding system of the present invention is mixed by the raw material of following percentage by weight:
The sodium hydroxide 0.15% of dodecyldimethylammonium hydroxide inner salt (amphoteric) 0.2%
The water surplus of acrylamide copolymer 0.01%.
Ultralow interfacial tension foam flooding system and carbon dioxide are taken, according to ultralow interfacial tension foam flooding system:Two Carbonoxide=1.6:1.4 volume ratios are injected into stratum simultaneously;The volume of described carbon dioxide presses formation pressure calculation; The ultralow interfacial tension foam flooding system of injection and the cumulative volume of carbon dioxide are the 20% of oil reservoir total pore size volume.
Embodiment 5:
Dodecyldimethylammonium hydroxide inner salt (amphoteric), Qi Tafen are substituted with dodecyl hydroxy sulfo lycine (amphoteric) Not with embodiment 1-4.
Embodiment 6:
Dodecyldimethylammonium hydroxide inner salt (amphoteric) is substituted with dodecyl hydroxypropyl sulfobetaines (amphoteric), its It is respectively the same as embodiment 1-4.
Embodiment 7:
Dodecyldimethylammonium hydroxide inner salt (amphoteric) is substituted with dodecanamide propyl hydroxy sulfo lycine (amphoteric), its It is respectively the same as embodiment 1-4.
Embodiment 8:
Dodecyldimethylammonium hydroxide inner salt (amphoteric), other difference are substituted with lauroylamidopropyl betaine (amphoteric) With embodiment 1-4.
Embodiment 9:
Dodecyldimethylammonium hydroxide inner salt (amphoteric), Qi Tafen are substituted with cocamidopropyl propyl amide amine oxide (cationic) Not with embodiment 1-4.
Embodiment 10:
Dodecyldimethylammonium hydroxide inner salt (amphoteric) is substituted with Shuangzi tertiary amine oxide (double type), it is other respectively with implementation Example 1-4.
Embodiment 11:
Dodecyldimethylammonium hydroxide inner salt (amphoteric) is substituted with polyoxyethylene lauryl alcohol ether sulfuric ester salt (cationic), It is other respectively with embodiment 1-4.
Embodiment 12:
Dodecyldimethylammonium hydroxide inner salt (amphoteric) is substituted with lauryl sodium sulfate (cationic), it is other same respectively Embodiment 1-4.
Embodiment 13:
Sodium hydroxide is substituted with natrium carbonicum calcinatum, it is other respectively with embodiment 1-12.
Embodiment 14:
With kodalk NaBO2Sodium hydroxide is substituted, it is other respectively with embodiment 1-12.
Embodiment 15:
Acrylamide copolymer is substituted with carboxymethyl cellulose PACHV, it is other respectively with embodiment 1-14.
Embodiment 16:
Acrylamide copolymer is substituted with partially hydrolyzed polyacrylamide (PHPA) HPAM, it is other respectively with embodiment 1-14.
Embodiment 17:
Acrylamide copolymer is substituted with hydroxypropyl methyl cellulose HPMC, it is other respectively with embodiment 1-14.
Embodiment 18:
Carbon dioxide is substituted with nitrogen, it is other respectively with embodiment 1-17.
Embodiment 19:
Carbon dioxide is substituted with nitrogen, it is other respectively with embodiment 1-17.
Embodiment 20:
Carbon dioxide is substituted with air, it is other respectively with embodiment 1-17.
Embodiment 21:
Carbon dioxide is substituted with empty flue gas, it is other respectively with embodiment 1-17.
Embodiment 22:
The ultralow interfacial tension foam flooding system of the present invention is mixed by the raw material of following percentage by weight:
The kodalk NaBO of dodecyl hydroxypropyl sulfobetaines (amphoteric) 0.2%20.1%
The water surplus of hydroxypropyl methyl cellulose HPMC 0.05%.
Ultralow interfacial tension foam flooding system and carbon dioxide are taken, according to ultralow interfacial tension foam flooding system:Nitrogen Gas=1:1 volume ratio is injected into stratum simultaneously;The volume of described nitrogen gas presses formation pressure calculation;The ultralow boundary of injection The cumulative volume of face tension force foam flooding system and nitrogen gas is the 30% of oil reservoir total pore size volume.

Claims (2)

  1. A kind of 1. ultralow interfacial tension foam flooding system, it is characterised in that it by following percentage by weight raw material mixing and Into:
    Foaming agent 0.1-0.3% inorganic reagents 0.05-0.15%
    Foam stabilizer 0.01-0.10% water surplus;
    Described foaming agent is dodecyl hydroxypropyl sulfobetaines, and described inorganic reagent is kodalk, and described is steady Infusion is hydroxypropyl methyl cellulose.
  2. 2. the application method of a kind of ultralow interfacial tension foam flooding system described in claim 1, it is characterised in that take ultralow Interfacial tension foam flooding system and nitrogen, according to ultralow interfacial tension foam flooding system:Nitrogen=1.4~1.6:1.6~ 1.4 volume ratios are injected into stratum simultaneously;The volume of the nitrogen presses formation pressure calculation;The ultralow interfacial tension foam flooding of injection The cumulative volume of oil systems and gas is the 10%~30% of oil reservoir total pore size volume.
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CN109777393B (en) * 2019-03-19 2020-04-14 中国石油化工股份有限公司 Foam oil displacement agent
CN110862809B (en) * 2019-12-03 2022-01-21 中国石油化工股份有限公司 Solid foam profile control composition, solid foam profile control slurry, preparation method of solid foam profile control slurry and profile control method
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