CN103540305B - Surfactant composition for chemical displacement of reservoir oil and preparation method thereof - Google Patents
Surfactant composition for chemical displacement of reservoir oil and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of Surfactant composition for chemical displacement of reservoir oil and preparation method thereof, mainly solve existing tensio-active agent oil displacement efficiency in tertiary oil recovery process poor, simultaneously because flooding system contains mineral alkali, formation and oil well bring injury, the problem of etching apparatus and pipeline and breakdown of emulsion difficulty.The present invention is by adopting a kind of surfactant composition, comprise cats product and Anionic-nonionic tensio-active agent, its cationic surfactant is selected from least one in quaternary ammonium salt or quaternary amine alkali, Anionic-nonionic tensio-active agent is the tensio-active agent containing oxyethyl group non-ionic group and carboxyl or sulfonic group anionic group, the mol ratio of described cats product and Anionic-nonionic tensio-active agent be 1: 0.01 ~ 1: 100 and preparation method thereof technical scheme solve this problem preferably, can be used in tertiary oil production in oil field process.
Description
Technical field
The present invention relates to a kind of Surfactant composition for chemical displacement of reservoir oil and preparation method thereof.
Background technology
Along with the increase of world energy sources demand, the rational exploitation and utilization of oil has caused the very big attention of people, to the produced quantity of oil and the requirement of production efficiency also more and more higher.Realize the high-efficiency mining of hydrocarbon resources, not only there is realistic meaning for raising crude production rate, have more important strategic importance.1/3 of the general only extraction oil in-place of conventional oil production method (once with secondary method), also have an appointment 2/3 crude oil fail extraction, therefore when energy day is becoming tight, improve the key subjects that tar productivity has become oil production research.Tertiary oil recovery technology is then a kind of method of effective raising tar productivity, can be divided into four large classes: one is that heating power drives, and comprises steam flood, combustion in situ etc.; Two is that mixed phase drives, and comprises CO
2mixed phase, hydrocarbon mixed phase and other rare gas element mixed phases drive; Three is chemical floodings; Four is microbe oil productions, comprises biological polymer, MICROBIAL SURFACTANT is driven.Chemical flooding is extremely important in intensified oil reduction and the extensive technology implemented, and comprises the multiple combination technology of polymer flooding, surfactant flooding, caustic waterflooding etc. and polymkeric substance, alkali, tensio-active agent.The effect of chemical flooding is the result of physical action and chemical action, and what physical action referred to displacing fluid involves effect, and chemical action refers to the microcosmic oil drive effect of displacing fluid.The core of chemical action reduces the interfacial tension of displacing fluid and crude oil.Tensio-active agent is owing to having oleophylic (hydrophobic) and hydrophilic (oleophobic) character concurrently, and when tensio-active agent is water-soluble, molecule is mainly distributed on water-oil interface, significantly can reduce oil water interfacial tension.The reduction of oil water interfacial tension means that surfactant system can overcome the force of cohesion between crude oil, and larger oil droplet is dispersed into little oil droplet, thus improves the percent of pass of crude stream when pore throat.The oil displacement efficiency of tensio-active agent also shows the effects such as the wettability of rock surface making oleophylic reverses, emulsification of crude oil, raising surface charge density and oil droplet coalescence, and this is the reason that tensio-active agent plays very important effect in chemical flooding technology.
Current surface active agent for tertiary oil recovery adopts Recompounded multielement system mostly, comprises nonionic surface active agent and ionogenic surfactant simultaneously, also adds the auxiliary agent such as alkali and alcohol in part formulation.As patent CN101024764A provides a kind of tensio-active agent of oil-field thick-oil well, this promoting agent is made up of water, sheet alkali, ethanol, oleic acid, alkylphenol polyoxyethylene, Sodium dodecylbenzene sulfonate.For another example patent CN1458219A discloses the surfactant polymer pure binary ultra low interfacial tension combination flooding formula of a kind of tertiary oil recovery application, the tensio-active agent wherein used is sulfonated petro-leum or is the complexed surfactant that host adds thinner and other surfactant compound with sulfonated petro-leum, the weight percent of its component is sulfonated petro-leum 50 ~ 100%, alkylsulfonate 0 ~ 50%, carboxylate salt 0 ~ 50%, alkylaryl sulphonate 0 ~ 35%, low-carbon alcohol 0 ~ 20%.And for example patent CN1394935 has invented a kind of chemical oil displacement agent, and it mainly comprises sodium octylbenzene sulfonate anion surfactant, surfactant adjuvant, tensio-active agent synergistic agent, surface active agent solubilization agent.This oil-displacing agent can reduce the structural viscosity of viscous crude significantly, can reduce oil water interfacial tension simultaneously, thus improves oil recovery factor.
But above-mentioned surface active agent for tertiary oil recovery still exists more problem, mainly surfactant activity is poor, oil displacement efficiency is low, simultaneously because surfactant system is too complicated, and thus Produced Liquid breakdown of emulsion difficulty, sewage disposal difficulty is large; In addition because flooding system is containing mineral alkali, formation and oil well bring injury, cause the problem such as etching apparatus and pipeline, and due to the serious viscosity reducing polymkeric substance of mineral alkali meeting, have to greatly improve the working concentration of polymkeric substance for reaching required viscosity, oil recovery comprehensive cost is improved; The high temperature resistance of tensio-active agent, high salt tolerance, anti-high salinity limited in one's ability.
As everyone knows, anion surfactant, as sulfonated petro-leum, petroleum carboxylate, alkylbenzene sulfonate etc. are widely used in tertiary oil recovery process at present, and cats product is easily adsorbed by stratum because of it or produce precipitation, therefore reduce the ability of oil water interfacial tension, be generally not used in tertiary oil recovery.Because when cationic and anionic surfactant mixes close to equal proportion, its aqueous solution easily forms precipitation, thus cause cationic and anionic surfactant mixed system not only to become incompatibility in the application, and correlation theory research is also more delayed.Research in recent years finds, the cationic and anionic surfactant mixed system aqueous solution has a lot of anomalous property, as there is the interaction between strong electrostatic interaction and hydrophobic carbon chain in aqueous due to cationic and anionic surfactant, facilitate the interionic association of two kinds of different charged surfactant of band, be easy in the solution form micella, produce the surfactivity higher than single tensio-active agent.In addition, cationic and anionic surfactant mixed system obviously can reduce the absorption loss of cats product on rock core, thus significantly can reduce the inherent defect of cats product.
Gong Yujun etc. (see volume the 1st phase Northwest University's journal in February the 30th (natural science edition) in 2000,28 ~ 31) research thinks that cetyl trimethylammonium bromide (CTAB) and sodium lauryl sulphate (SDS) mixed system have solublization.In oil production process, utilize solublization can " displacement of reservoir oil ", by under the oil wash that sticks on the sandstone of rock stratum, thus improve oil recovery.Huang Hongdu etc. (see oil and gas journal volume the 4th phase August the 29th in 2007,101 ~ 104) have studied the anion surfactants such as sulfonated petro-leum, petroleum carboxylate, alkylbenzene sulfonate and cetyl trimethylammonium bromide, alkali compound system interfacial tension and draw to draw a conclusion: adding of cats product makes the interfacial activity of petroleum carboxylate, alkylbenzene sulfonate, sulfonated petro-leum improve.
Above-mentioned result of study shows that anions and canons Surfactant Mixing Systems has certain effect for reduction oil water interfacial tension, raising oil displacement efficiency.But the former result of study shows its interface performance still to have much room for improvement, and the latter still have employed alkali in system, thus alkali formation and oil well cannot be avoided to bring injury, etching apparatus and the problem such as pipeline and breakdown of emulsion difficulty.Above-mentioned system ratio is easier to generate precipitation in addition, is unfavorable for practical application.
For this reason, one aspect of the present invention absorbs has used for reference forefathers about anions and canons Surfactants mixed system result of study, Anionic-nonionic tensio-active agent is adopted to replace traditional anion surfactant on the other hand, the shortcoming such as easily to precipitate when overcoming cationic anionic surfactant combination, invented the cats product for the chemical displacement of reservoir oil and Anionic-nonionic surfactant composition.
Summary of the invention
One of technical problem to be solved by this invention is that existing tensio-active agent oil displacement efficiency in tertiary oil recovery process is poor, simultaneously because flooding system contains mineral alkali, formation and oil well bring injury, the problem of etching apparatus and pipeline and breakdown of emulsion difficulty, a kind of new compound surfactant composition is provided, said composition has that interfacial activity is high, washing oil ability is strong, system is simple, formation and oil well can not bring injury, can not etching apparatus and pipeline and can not cause the advantage of breakdown of emulsion difficulty.
Two of technical problem to be solved by this invention is to provide a kind of preparation method of the surfactant composition corresponding with technical solution problem one.
For one of solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of Surfactant composition for chemical displacement of reservoir oil and preparation method thereof, comprise cats product and Anionic-nonionic tensio-active agent, the mol ratio of described cats product and Anionic-nonionic tensio-active agent is 1: 0.01 ~ 1: 100, its cationic surfactant is selected from least one in quaternary ammonium salt or quaternary amine alkali, and Anionic-nonionic surfactant molecule general formula is:
(A) or
(B)
Wherein M is any one in basic metal, alkaline-earth metal, ammonium radical ion, and m, n are any one integer in 0 ~ 14, and oxyethyl group polymerization degree X is any one integer in 0.1 ~ 100 or decimal.
In technique scheme, described cats product preferred version is selected from least one in tetra-alkyl ammonium chloride or tetra-alkyl ammonium hydroxide; Described Anionic-nonionic tensio-active agent cationic M preferred version is selected from Na, K, Mg, Ca or NH
4 +in any one; For Anionic-nonionic surfactant A, described m+n=10,12,14,16; For Anionic-nonionic surfactant B, described m+n=9,11,13,15; Described oxyethyl group polymerization degree X is any one integer in 1 ~ 20 or decimal; The mol ratio preferable range of described cats product and Anionic-nonionic tensio-active agent is 1: 0.1 ~ 1: 10.
For solve the problems of the technologies described above two, the technical solution used in the present invention is as follows: a kind of preparation method of Surfactant composition for chemical displacement of reservoir oil, comprises the following steps:
A) alkylphenol polyoxyethylene, catalyzer and alkene sulfonate or olefin carboxylic acid's salt are added reactor, 50 ~ 150
oc reaction 1 ~ 20 hour, wherein alkylphenol polyoxyethylene: alkene sulfonate or olefin carboxylic acid's salt mol ratio are 1:0.1 ~ 0.5, then add alkali neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent;
B) be dissolved in the water respectively by cats product and according to the Anionic-nonionic tensio-active agent that step a obtains, then mix according to mol ratio 1: 0.1 ~ 1: 10 and obtain required composition.
In technique scheme, described catalyzer is selected from least one in HF, chlorsulfonic acid or p-methyl benzenesulfonic acid.
Surfactant composition for chemical displacement of reservoir oil of the present invention is on the one hand due to electrostatic attraction effect strong between anions and canons tensio-active agent opposite charges polar group, surfactant molecule is increased in adsorbed on interfaces amount, micelle-forming concentration significantly reduces, thus has the incomparable high surface of single tensio-active agent; Simultaneously due to the interfacial activity of surfactant composition superelevation, its aqueous solution can form ultra low interfacial tension with crude oil, thus effectively overcomes the force of cohesion between crude oil, is conducive to former oil-out, and then significantly improves oil displacement efficiency.Surfactant composition can change oil reservoir wettability of the surface on the other hand, as the cats product in composition by with absorption electronegative Interaction of substituents on a solid surface, its desorption is got off, glossy wet structure is made to change into intermediate wet or water-wet surface, reduce the work of adhesion of crude oil at solid surface, thus be conducive to the stripping of crude oil.Anions and canons tensio-active agent mixing solutions has solublization to crude oil simultaneously, can be washed down by the crude oil sticked on the sandstone of rock stratum further, improves oil recovery factor.
Adopt surfactant composition of the present invention in tertiary oil recovery process, there is interfacial activity high: compound surfactant composition consumption is still can form 10 with underground crude oil under 0.01 ~ 0.05% condition
-3~ 10
-4mN/m ultra low interfacial tension; Washing oil ability is strong: surfactant composition to the washing oil rate of crude oil more than 40%; Surfactant composition system is simple.Because system is not containing mineral alkali, the injury that when thus avoiding rig-site utilization, mineral alkali formation causes, the corrosion caused equipment and the problem of breakdown of emulsion difficulty caused thus, achieve good technique effect.
Below by embodiment, the present invention is further elaborated.
Embodiment
[embodiment 1]
By alkylphenol polyoxyethylene (1), CH
3cH=CH (CH
2)
9sO
3na and 5wt%HF adds reactor, in 50
oc reacts 20 hours, wherein alkylphenol polyoxyethylene (1): CH
3cH=CH (CH
2)
9sO
3na mol ratio is 1:0.1, and then add 30%NaOH neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl sodium sulfonate of ethoxylated tensio-active agent benzyltriethylammoinium chloride and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 0.1 mixes, obtain surfactant composition 1, its composition, structure are in table 1.
[embodiment 2]
By alkylphenol polyoxyethylene (4), CH
3cH
2cH=CH (CH
2)
10sO
3na and 2wt%ClSO
3h adds reactor, in 150
oc reacts 1 hour, wherein alkylphenol polyoxyethylene (4): CH
3cH=CH (CH
2)
10sO
3na mol ratio is 1:0.2, then adds ammonia neutralization, and carries out oily water separation, and aqueous phase obtains Anionic-nonionic tensio-active agent.
The alkylaryl sodium sulfonate of ethoxylated tensio-active agent four octyl group ammonium chlorides and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 0.7 mixes, obtain surfactant composition 2, its composition, structure are in table 1.
[embodiment 3]
By alkylphenol polyoxyethylene (7.3), CH
3(CH
2)
8cH=CH (CH
2)
5sO
3na and 4wt% p-methyl benzenesulfonic acid adds reactor, in 80
oc reacts 12 hours, wherein alkylphenol polyoxyethylene (7.3): CH
3(CH
2)
8cH=CH (CH
2)
5sO
3na mol ratio is 1:0.4, then adds 10%Ca (HCO
3)
2neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl sodium sulfonate of ethoxylated tensio-active agent phenyl trimethicone ammonium chloride and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 1.4 mixes, obtain surfactant composition 3, its composition, structure are in table 1.
[embodiment 4]
By alkylphenol polyoxyethylene (20), CH
3(CH
2)
15cH=CHSO
3na and 3wt% p-methyl benzenesulfonic acid adds reactor, in 120
oc reacts 4 hours, wherein alkylphenol polyoxyethylene (20): CH
3(CH
2)
15cH=CHSO
3na mol ratio is 1:0.5, then adds 10%Mg (HCO
3)
2neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl sodium sulfonate of ethoxylated tensio-active agent stearyl dimethyl benzyl ammonium chloride and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 10 mixes, obtain surfactant composition 4, its composition, structure are in table 1.
[embodiment 5]
By alkylphenol polyoxyethylene (12), CH
3(CH
2)
3cH=CH (CH
2)
7cOONa and 5wt%HF adds reactor, in 100
oc reacts 8 hours, wherein alkylphenol polyoxyethylene (12): CH
3(CH
2)
3cH=CH (CH
2)
7cOONa mol ratio is 1:0.5, and then add 30%NaOH neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl Soxylat A 25-7 carboxyl acid natrium surfactant distearyl dimethyl ammonium chloride and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 1.8 mixes, obtain surfactant composition 5, its composition, structure are in table 1.
[embodiment 6]
By alkylphenol polyoxyethylene (16), CH
3(CH
2)
7cH=CH (CH
2)
7cOONa and 4wt%ClSO
3h adds reactor, in 70
oc reacts 15 hours, wherein alkylphenol polyoxyethylene (16): CH
3(CH
2)
7cH=CH (CH
2)
7cOONa mol ratio is 1:0.4, and then add 30%KOH neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl Soxylat A 25-7 carboxyl acid natrium surfactant Dodecyl trimethyl ammonium chloride and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 6 mixes, obtain surfactant composition 6, its composition, structure are in table 1.
[embodiment 7]
By alkylphenol polyoxyethylene (9), CH
3(CH
2)
4cH=CH (CH
2)
4cOONa and 5wt% p-methyl benzenesulfonic acid adds reactor, in 80
oc reacts 10 hours, wherein alkylphenol polyoxyethylene (9): CH
3(CH
2)
4cH=CH (CH
2)
4cOONa mol ratio is 1:0.3, and then add 30%NaOH neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl Soxylat A 25-7 carboxyl acid natrium surfactant palmityl trimethyl ammonium chloride and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 4 mixes, obtain surfactant composition 7, its composition, structure are in table 1.
[embodiment 8]
By alkylphenol polyoxyethylene (5), CH
3(CH
2)
6cH=CH (CH
2)
6cOONa and 4wt%ClSO
3h adds reactor, in 90
oc reacts 8 hours, wherein alkylphenol polyoxyethylene (5): CH
3(CH
2)
6cH=CH (CH
2)
6cOONa mol ratio is 1:0.4, and then add 30%KOH neutralization, and carry out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent.
Alkylaryl Soxylat A 25-7 carboxyl acid natrium surfactant decyl triethylammonium hydroxide and the present invention prepared is dissolved in the water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, then by above-mentioned tensio-active agent according to positively charged ion: Anionic-nonionic surfactant molar ratio 1: 4 mixes, obtain surfactant composition 6, its composition, structure are in table 1.
[embodiment 9]
0.30wt% surfactant composition embodiment 5 prepared and 0.15wt% polyacrylamide (molecular weight 2,600 ten thousand) aqueous solution evenly, obtain a kind of Polymer Used For Oil Displacement-surfactant complex.
Table 1 surfactant composition composition and structure
[embodiment 10] surfactant interface performance test
Rotate with TX-500C and drip interfacial tensimeter mensuration surfactant oil displacement composition and Shuanghe Oil Field
5-11 series of strata oil water interfacial tension.Measuring temperature is 81
oc, local water is NaHCO
3type, salinity is 7947mg/L, chloride ion content 2002mg/L, Ca
2+content 20mg/L, Mg
2+content 12.2mg/L, surfactant composition consumption is 0.3%.
Table 2 surfactant composition and Shuan He oil field
5-11 series of strata oil water interfacial tension result
| Embodiment | Interfacial tension (mN/m) |
| 1 | 0.0082 |
| 2 | 0.0076 |
| 3 | 0.0005 |
| 4 | 0.0088 |
| 5 | 0.0003 |
| 6 | 0.0024 |
| 7 | 0.0022 |
| 8 | 0.0066 |
| 9 | 0.0020 |
As shown in Table 2, the compound surfactant that prepared by embodiment 1 ~ 8 has good interface performance for Henan Oil Field.Embodiment 9 shows, tensio-active agent prepared by the present invention and polymkeric substance composite after, its interface performance is still good.
Surfactant composition prepared by embodiment 5 is mixed with different concns, respectively test and Shuanghe Oil Field
5-11 series of strata oil water interfacial tension, the results are shown in Table 3.
Table 3 different concns surfactant composition 5 and Shuanghe Oil Field
5-11 series of strata oil water interfacial tension
| Dosage of surfactant (%) | 0.01 | 0.02 | 0.05 | 0.1 | 0.2 | 0.3 |
| Interfacial tension (MN/m) | 0.009 | 0.008 | 0.007 | 0.001 | 0.0006 | 0.0003 |
The above results shows, surfactant composition of the present invention has very high interfacial activity for Henan Oil Field crude oil.
Rotate with TX-500C and drip interfacial tensimeter and again measure surfactant composition prepared by embodiment 4 and recover the oil three factory's oil water interfacial tensions in Zhongyuan Oil Field.Measuring temperature is 80
oc, formation water salinity is 79439mg/L, Ca
2+content 592mg/L, Mg
2+content 2871mg/L, dosage of surfactant is 0.3%.Oil water interfacial tension is 0.002mN/m, shows tensio-active agent of the present invention not only for low mineralization oil reservoir, still has good interface performance simultaneously, have the advantage that the scope of application is wide for high temperature and high salt oil deposit.
The aptitude tests of [embodiment 11] tensio-active agent washing oil
Get Shuanghe Oil Field
5-11 series of strata oil-sand, according to oil: sand=1:4 (weight ratio) is 81
oaging 7 days of C, stirs 5 minutes for every 2 hours; Then take out above-mentioned aging after oil-sand 5g, with 0.3% surfactant soln by oil-sand: solution=1:10 mixes, under reservoir temperature after aging 48 hours, with the crude oil in petroleum ether extraction solution, with 50ml colorimetric cylinder constant volume, spectrophotometer is in wavelength 430nm place's colorimetric analysis.Utilize typical curve gauging surface activator solution Crude Oil concentration.
Table 4 tensio-active agent washing oil result
| Embodiment | Washing oil rate % |
| 1 | 52.3 |
| 2 | 48.7 |
| 3 | 69.6 |
| 4 | 62.5 |
| 5 | 65.4 |
| 6 | 55.3 |
| 7 | 57.9 |
| 8 | 49.5 |
[embodiment 12] surfactant composition Oil Displacing Capacity is studied
Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out oil displacement test.First use Shuanghe Oil Field
5-11 series of strata local water is driven to moisture 92%, and after the surfactant composition of metaideophone 0.3pv (rock pore volume), water drive, to moisture 100%, improves oil recovery factor and the results are shown in Table 5.
Table 5 surfactant flooding test-results
| Embodiment | Improve recovery ratio % |
| 1 | 5.0 |
| 2 | 4.6 |
| 3 | 6.9 |
| 4 | 5.8 |
| 5 | 6.7 |
| 6 | 6.3 |
| 7 | 6.2 |
| 8 | 5.5 |
[comparative example 1]
According to Northwest University's journal (natural science edition) volume the 1st phase February the 30th in 2000, cetyl trimethylammonium bromide (CTAB) and sodium lauryl sulphate (SDS) are mixed with mixed system (mol ratio 1:1.5) by the methods such as 28 ~ 31 Gong Yu armies, test it respectively when 0.3% consumption and Shuanghe Oil Field
5-11 series of strata crude oil oil water interfacial tension, washing oil rate and Oil Displacing Capacity, result is as follows:
Table 6 reference oil-displacing agent performance
| Interfacial tension (MN/m) | Washing oil rate % | Improve recovery ratio % |
| 0.03 | 45.6 | 2.8 |
[comparative example 2]
According to oil and gas journal volume the 4th phase August the 29th in 2007, Huang Hongdu etc. (101 ~ 104) method etc. are by 0.01% cetyl trimethylammonium bromide and 0.02% anion surfactant sulfonated petro-leum and 1.8%Na
2cO
3be mixed with mixed system, test it respectively when 0.3% consumption and Shuanghe Oil Field
5-11 series of strata crude oil oil water interfacial tension, washing oil rate and Oil Displacing Capacity, result is as follows:
Table 7 reference oil-displacing agent performance
| Interfacial tension (MN/m) | Washing oil rate % | Improve recovery ratio % |
| 0.008 | 56.3 | 4.2 |
Claims (5)
1. a Surfactant composition for chemical displacement of reservoir oil, comprise cats product and Anionic-nonionic tensio-active agent, the mol ratio of described cats product and Anionic-nonionic tensio-active agent is 1: 0.01 ~ 1: 100, described cats product is selected from least one in tetra-alkyl ammonium chloride or tetra-alkyl ammonium hydroxide, and Anionic-nonionic surfactant molecule general formula is:
Wherein M is any one in basic metal, alkaline-earth metal, ammonium radical ion, and m, n are any one integer in 0 ~ 14, and oxyethyl group polymerization degree X is any one integer in 1 ~ 20 or decimal.
2. Surfactant composition for chemical displacement of reservoir oil according to claim 1, is characterized in that described Anionic-nonionic tensio-active agent cationic M is selected from Na
+, K
+, Mg
2+, Ca
2+or NH
4 +in any one.
3. Surfactant composition for chemical displacement of reservoir oil according to claim 1, is characterized in that for Anionic-nonionic surfactant A, described m+n=10,12,14,16; For Anionic-nonionic surfactant B, described m+n=9,11,13,15.
4. the preparation method of Surfactant composition for chemical displacement of reservoir oil described in claim 1, comprises following steps:
A) alkylphenol polyoxyethylene, catalyzer and alkene sulfonate or olefin carboxylic acid's salt are added reactor, 50 ~ 150 DEG C of reactions 1 ~ 20 hour, wherein alkylphenol polyoxyethylene: alkene sulfonate or olefin carboxylic acid's salt mol ratio are 1:0.1 ~ 0.5, then add alkali neutralization, and carrying out oily water separation, aqueous phase obtains Anionic-nonionic tensio-active agent;
B) be dissolved in the water respectively by cats product and according to the Anionic-nonionic tensio-active agent that step a) obtains, then mix according to mol ratio 1: 0.1 ~ 1: 10.
5. the preparation method of chemical displacement of reservoir oil tensio-active agent according to claim 4, is characterized in that described catalyzer is selected from least one in HF, chlorsulfonic acid or p-methyl benzenesulfonic acid.
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| CN106590581B (en) * | 2015-10-20 | 2019-06-11 | 中国石油化工股份有限公司 | Salt tolerant displacement composition and preparation method thereof |
| CN106590582B (en) * | 2015-10-20 | 2019-05-14 | 中国石油化工股份有限公司 | Salt tolerant oil displacement surfactant and preparation method thereof |
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