CN102086389A - Temperature-resistant salt-resistant composite foam oil displacement agent for tertiary oil recovery and preparation method thereof - Google Patents
Temperature-resistant salt-resistant composite foam oil displacement agent for tertiary oil recovery and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a temperature-resistant salt-resistant composite foam oil displacement agent for tertiary oil recovery and a preparation method thereof, belonging to the field of chemical oil displacement for increasing the crude oil recovery ratio of the oil field. The oil displacement agent is compounded by 0.5-1% of alpha-alkene sulfonate as a main surfactant and other auxiliary agents and comprises the following components in percentage by mass:0.1-1.5% of anionic surfactant, 0.2-0.8% of zwitterionic surfactant, 2-10% of organic solvent, 5-12% of stabilizing agent and the balance of a salt solution added to be 100%. Compounds related to the oil displacement agent are industrially produced fine chemical products, the raw materials are easy to obtain, the production cost is low, and the preparation is simple; the oil displacement agent has performances of temperature resistance, salt resistance, ultralow interfacial tension and the like; the persistence of the foam is strong, and the half-life period can be more than 120min at 85 DEG C; the oil displacement age has excellent compatibility with other surfactants, and the comprehensive recovery ratio of the crude oil can be increased by about 10-15%.
Description
Technical field
The present invention relates to improve the chemical displacement of reservoir oil field of crude oil recovery ratio, a kind of specifically temperature resistant antisalt composite foam oil-displacing agent that is applied to tertiary oil recovery and preparation method thereof.
Background technology
From the eighties in 20th century, each elephant of China begins to carry out secondary oil recovery on a large scale, drives etc. as steam stimulation, polymer flooding, biology, and purpose is that the remaining about 60 % crude oil of primary recovery are displaced.So far, the displacement of reservoir oil of 10-20 wheel secondary was carried out to oil well substantially in the higher oil field of some oil recovery techniques.Along with constantly carrying out of oil production, the present main oilfield of China has entered high water-cut stage of secondary oil recovery later stage, and underground crude oil is in discontinuous dispersion state.In order to improve the recovery ratio in oil field, increase can the amount of gathering, and tertiary oil recovery technology more and more is subject to people's attention.
In the method for tertiary oil recovery, mainly contain following several at present: (1) polymer flooding; (2) ternary composite driving; (3) caustic waterflooding.Wherein ternary composite driving (alkali-polymkeric substance-tensio-active agent) grows up on caustic waterflooding and polymer flooding basis, it also is the flooding method that is most widely used at present, though can improve oil recovery factor in a large number, wherein contained a large amount of alkali have all brought huge injury near stratum the oil field and oil well etc.
Therefore, press for the efficient flooding system of development of new cheapness.Foam flooding more and more is subject to people's attention with its unique seepage flow and displacement of reservoir oil performance.System can reduce the interfacial tension between profit, improves well and hides sweep efficiency, good shutoff adjustment performance is arranged again, thereby can improve oil-recovering rate; It is strong that it hides shut-off capacity to well, and the impact of generation is relative less with infringement, can slow down the damage that in the oil displacement process stratum is caused.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of oil displacement efficiency good, be applicable to low pressure and low permeability, with good temperature resistant antisalt composite foam oil-displacing agent of local water compatibleness and preparation method thereof.For achieving the above object, the invention provides following technical scheme:
A kind of temperature resistant antisalt composite foam oil-displacing agent that is used for tertiary oil recovery is characterized in that: comprise following ingredients by weight percent:
Sulfonated 0.5-1%,
Anion surfactant 0.1-0.5%,
Zwitterionics 0.2-0.8%,
Organic solvent 2-10%,
Stablizer 5-12%,
All the other add salt solution to 100%;
Described anion surfactant is one or more a mixture of dodecyl sodium naphthalene sulfonate, lauric alcohol sodium sulfate, monoalky lether phosphoric acid ester triethanolamine salt, Aerosol OT, alkylphenol polyoxyethylene Succinic Acid half ester sodium sulfonate;
Described zwitterionics is one or more a mixture of dodecyl dihydroxy ethyl ammonium oxide, cocamidopropyl propyl amide hydroxyl sulphur trimethyl-glycine, dodecanamide propyl amine oxide, Varion CDG-K;
Described organic solvent is one or more a mixture of ethanol, Virahol, acetone;
Described stablizer is the mixture of a kind of or its any proportioning of lauryl alcohol, polysorbas20;
Described salt solution is the mixing solutions of sodium-chlor, calcium chloride and sal epsom, and its layoutprocedure is: add 27g sodium-chlor, 1.47g Calcium Chloride Powder Anhydrous and 4.12g anhydrous magnesium sulfate in the 1L pure water, stirring then gets final product;
In above-mentioned flooding system, sulfonated is the major surfaces promoting agent, and other all are auxiliary agent, through composite formation oil-displacing agent.This oil-displacing agent Heat stability is good does not have precipitation, not muddy at 85 ℃, need not to add alkali, and is high temperature resistant, saline-alkaline tolerance is strong.
The method that the present invention prepares temperature resistant antisalt composite foam oil-displacing agent may further comprise the steps:
A), at normal temperatures and pressures, 50% of anion surfactant, zwitterionics, organic solvent, stablizer and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
B), stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
Compared with prior art, the present invention has the following advantages:
(1) compound involved in the present invention is the fine chemicals of suitability for industrialized production, and raw material is easy to get, and production cost is low.
(2) alkali-free in the oil-displacing agent of the present invention, thus alkali reduced to the injury that near stratum the oil field and oil well etc. bring, help the sustainable exploitation in oil field.
(3) Heat stability is good of oil-displacing agent of the present invention, not muddy in the time of 85 ℃ on the stratum, there is not precipitation, have stronger anti-salt property.The comprehensive oil extraction rate generally can improve 10%-15%.
(4) the foamy persistence of oil-displacing agent generation of the present invention is strong, and under 85 ℃ condition, the foamy transformation period can reach more than 120 minutes.
(5) oil-displacing agent of the present invention can effectively reduce oil water interfacial tension to 9 * 10 under the condition of 85 ℃ of temperature, salinity 30000mg/L, calcium-magnesium content 800mg/L
-3Below the mN/m.
Embodiment
For a better understanding of the present invention, further illustrate content of the present invention, but content of the present invention not only is confined to the following examples below in conjunction with embodiment.
Embodiment 1:Raw material: sulfonated 50g, lauric alcohol sodium sulfate 12g, dodecyl dihydroxy ethyl ammonium oxide 26g, ethanol 250g, polysorbas20 are 600g, sodium-chlor 270g, Calcium Chloride Powder Anhydrous 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.
Preparation process:
(1) in the 10000g pure water, adds 270g sodium-chlor, 14.7g Calcium Chloride Powder Anhydrous and 41.2g anhydrous magnesium sulfate, stir then, promptly get salt solution.
(2) at normal temperatures and pressures, 50% of lauric alcohol sodium sulfate, dodecyl dihydroxy ethyl ammonium oxide, ethanol, polysorbas20 and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
(3) stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
85 ℃ of temperature, under the salinity 30000mg/L condition, use Luo Shi foam survey meter, recording half foam life period is 136 minutes; Use the rotation of Dataphysics SVT20 video to drip tensiometer, under 10000 rev/mins of conditions of speed of rotation, recording minimum interfacial tension is 1.5 * 10
-3MN/m.
Embodiment 2:Raw material: sulfonated 55g, dodecyl sodium naphthalene sulfonate 20g, cocamidopropyl propyl amide hydroxyl sulphur trimethyl-glycine 35g, Virahol 300g, polysorbas20 are 700g, sodium-chlor 270g, Calcium Chloride Powder Anhydrous 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.
Preparation process:
(1) in the 10000g pure water, adds 270g sodium-chlor, 14.7g Calcium Chloride Powder Anhydrous and 41.2g anhydrous magnesium sulfate, stir then, promptly get salt solution.
(2) at normal temperatures and pressures, 50% of dodecyl sodium naphthalene sulfonate, cocamidopropyl propyl amide hydroxyl sulphur trimethyl-glycine, Virahol, polysorbas20 and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
(3) stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
85 ℃ of temperature, under the salinity 30000mg/L condition, use Luo Shi foam survey meter, recording half foam life period is 152 minutes; Use the rotation of Dataphysics SVT20 video to drip tensiometer, under 10000 rev/mins of conditions of speed of rotation, recording minimum interfacial tension is 4.2 * 10
-3MN/m.
Embodiment 3:Raw material: sulfonated 62g, monoalky lether phosphoric acid ester triethanolamine salt 35g, dodecanamide propyl amine oxide 50g, Virahol 300g, polysorbas20 are 850g, sodium-chlor 270g, Calcium Chloride Powder Anhydrous 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.
Preparation process:
(1) in the 10000g pure water, adds 270g sodium-chlor, 14.7g Calcium Chloride Powder Anhydrous and 41.2g anhydrous magnesium sulfate, stir then, promptly get salt solution.
(2) at normal temperatures and pressures, 50% of monoalky lether phosphoric acid ester triethanolamine salt, dodecanamide propyl amine oxide, Virahol, polysorbas20 and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
(3) stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
85 ℃ of temperature, under the salinity 30000mg/L condition, use Luo Shi foam survey meter, recording half foam life period is 163 minutes; Use the rotation of Dataphysics SVT20 video to drip tensiometer, under 10000 rev/mins of conditions of speed of rotation, recording minimum interfacial tension is 2.7 * 10
-3MN/m.
Embodiment 4:Raw material: sulfonated 75g, alkylphenol polyoxyethylene Succinic Acid half ester sodium sulfonate 42g, Varion CDG-K 65g, acetone 400g, lauryl alcohol are 960g, sodium-chlor 270g, Calcium Chloride Powder Anhydrous 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.
Preparation process:
(1) in the 10000g pure water, adds 270g sodium-chlor, 14.7g Calcium Chloride Powder Anhydrous and 41.2g anhydrous magnesium sulfate, stir then, promptly get salt solution.
(2) at normal temperatures and pressures, 50% of alkylphenol polyoxyethylene Succinic Acid half ester sodium sulfonate, Varion CDG-K, acetone, lauryl alcohol and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
(3) stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
85 ℃ of temperature, under the salinity 30000mg/L condition, use Luo Shi foam survey meter, recording half foam life period is 181 minutes; Use the rotation of Dataphysics SVT20 video to drip tensiometer, under 10000 rev/mins of conditions of speed of rotation, recording minimum interfacial tension is 8.9 * 10
-3MN/m.
Embodiment 5:Raw material: sulfonated 80g, lauric alcohol sodium sulfate 45g, Varion CDG-K 80g, acetone 650g, polysorbas20 are 840g, sodium-chlor 270g, Calcium Chloride Powder Anhydrous 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.
Preparation process:
(1) in the 10000g pure water, adds 270g sodium-chlor, 14.7g Calcium Chloride Powder Anhydrous and 41.2g anhydrous magnesium sulfate, stir then, promptly get salt solution.
(2) at normal temperatures and pressures, 50% of lauric alcohol sodium sulfate, Varion CDG-K, acetone, polysorbas20 and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
(3) stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
85 ℃ of temperature, under the salinity 30000mg/L condition, use Luo Shi foam survey meter, recording half foam life period is 149 minutes; Use the rotation of Dataphysics SVT20 video to drip tensiometer, under 10000 rev/mins of conditions of speed of rotation, recording minimum interfacial tension is 1.9 * 10
-3MN/m.
Embodiment 6:Raw material: sulfonated 95g, monoalky lether phosphoric acid ester triethanolamine salt 50g, Varion CDG-K 75g, Virahol 740g, polysorbas20 are 900g, sodium-chlor 270g, Calcium Chloride Powder Anhydrous 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.
Preparation process:
(1) in the 10000g pure water, adds 270g sodium-chlor, 14.7g Calcium Chloride Powder Anhydrous and 41.2g anhydrous magnesium sulfate, stir then, promptly get salt solution.
(2) at normal temperatures and pressures, 50% of monoalky lether phosphoric acid ester triethanolamine salt, Varion CDG-K, Virahol, polysorbas20 and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
(3) stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
85 ℃ of temperature, under the salinity 30000mg/L condition, use Luo Shi foam survey meter, recording half foam life period is 153 minutes; Use the rotation of Dataphysics SVT20 video to drip tensiometer, under 10000 rev/mins of conditions of speed of rotation, recording minimum interfacial tension is 3.6 * 10
-3MN/m.
Claims (2)
1. temperature resistant antisalt composite foam oil-displacing agent that is used for tertiary oil recovery is characterized in that: comprise following ingredients by weight percent:
Sulfonated 0.5-1%,
Anion surfactant 0.1-0.5%,
Zwitterionics 0.2-0.8%,
Organic solvent 2-10%,
Stablizer 5-12%,
The salt water surplus;
Described anion surfactant is one or more a mixture of dodecyl sodium naphthalene sulfonate, lauric alcohol sodium sulfate, monoalky lether phosphoric acid ester triethanolamine salt, Aerosol OT, alkylphenol polyoxyethylene Succinic Acid half ester sodium sulfonate;
Described zwitterionics is one or more a mixture of dodecyl dihydroxy ethyl ammonium oxide, cocamidopropyl propyl amide hydroxyl sulphur trimethyl-glycine, dodecanamide propyl amine oxide, Varion CDG-K;
Described organic solvent is one or more a mixture of ethanol, Virahol, acetone;
Described stablizer is the mixture of a kind of or its any proportioning of lauryl alcohol, polysorbas20;
Described salt solution is the mixing solutions of sodium-chlor, calcium chloride and sal epsom; Its layoutprocedure is: add 27g sodium-chlor, 1.47g Calcium Chloride Powder Anhydrous and 4.12g anhydrous magnesium sulfate in the 1L pure water, stirring then gets final product.
2. the preparation method who is used for the temperature resistant antisalt composite foam oil-displacing agent of tertiary oil recovery as claimed in claim 1 is characterized in that this method may further comprise the steps:
A), at normal temperatures and pressures, 50% of anion surfactant, zwitterionics, organic solvent, stablizer and total salt water yield added reactor, fully stir 1-2h, till dissolving fully;
B), stir after, sulfonated added stirs 0.5-1h in the reactor, add remaining salt solution then and promptly get the oil-displacing agent finished product.
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