CN103421480A - Oil displacement surfactant composition and preparation method thereof - Google Patents
Oil displacement surfactant composition and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to an oil displacement surfactant composition and a preparation method thereof, wherein problems that the existing surfactant has poor oil displacement efficiency during a tertiary oil recovery process and the oil displacement system contains an inorganic base so as to cause damage on stratum and oil wells, corrode equipment and pipelines, and cause difficult demulsification are mainly solved with the present invention. The technical scheme comprises that: a surfactant composition is adopted, and comprises a cationic surfactant and an anionic-nonionic surfactant, and the preparation method is provided, wherein the cationic surfactant is one selected from a quaternary ammonium salt and a quaternary amine base, the anionic-nonionic surfactant is a surfactant containing an ethoxy nonionic group and a carboxyl or sulfonic acid anionic group, and a molar ratio of the cationic surfactant to the anionic-nonionic surfactant is 1:0.01-1:100. With the technical scheme, the problems are well solved, and the composition can be used for the oil field tertiary oil recovery process.
Description
Technical field
The present invention relates to a kind of surfactant oil displacement composition and method of making the same.
Background technology
Along with the increase of world energy sources demand, the rational exploitation and utilization of oil has caused people's very big attention, also more and more higher to the requirement of the produced quantity of oil and production efficiency.Realize the high-efficiency mining of hydrocarbon resources, for improving crude production rate, not only there is realistic meaning, have more important strategic importance.1/3 of the general only extraction oil in-place of conventional oil production method (once with the secondary method), 2/3 the crude oil of also having an appointment is failed extraction, therefore in the situation that be becoming tight energy day, improves the key subjects that tar productivity has become oil production research.Tertiary oil recovery technology is a kind of method of effective raising tar productivity, can be divided into four large classes: the one, and heating power drives, and comprises steam flood, combustion in situ etc.; The 2nd, mixed phase drives, and comprises CO
2Mixed phase, hydrocarbon mixed phase and other rare gas element mixed phases drive; The 3rd, chemical flooding; The 4th, microbe oil production, comprise that biological polymer, MICROBIAL SURFACTANT drive.Chemical flooding is the technology of extremely important in intensified oil reduction and extensive enforcement, 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 physical action refers to the effect that involves of displacing fluid, and chemical action refers to the microcosmic oil drive effect of displacing fluid.The core of chemical action is to reduce 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 mainly is distributed on water-oil interface, can significantly 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 to little oil droplet, thereby 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 wettability of rock surface reversion, emulsification of crude oil, raising surface charge density and oil droplet coalescence that make oleophylic, and this is the reason that tensio-active agent plays very important effect in the chemical flooding technology.
Surface active agent for tertiary oil recovery adopts the Recompounded multielement system mostly at present, comprises nonionic surface active agent and ionogenic surfactant simultaneously, in the part formula, also adds alkali and alcohol to wait auxiliary agent.As the tensio-active agent that patent CN101024764A provides a kind of oil-field thick-oil well to use, this promoting agent is comprised of water, sheet alkali, ethanol, oleic acid, alkylphenol polyoxyethylene, Sodium dodecylbenzene sulfonate.Patent CN1458219A discloses a kind of pure binary ultra low interfacial tension of surfactant polymer combination flooding formula of tertiary oil recovery application for another example, use therein tensio-active agent is that sulfonated petro-leum or the sulfonated petro-leum of take add the complexed surfactant of thinner and other surfactant compound as host, 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 octyl group benzene sulfonic acid sodium salt 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, thereby improves oil recovery factor simultaneously.
Yet still there is more problem in above-mentioned surface active agent for tertiary oil recovery, be mainly that surfactant activity is poor, oil displacement efficiency is low, simultaneously because surfactant system is too complicated, thereby Produced Liquid breakdown of emulsion difficulty, the sewage disposal difficulty is large; In addition because flooding system contains mineral alkali, injury is brought in stratum and oil well, cause the problems such as etching apparatus and pipeline, and because mineral alkali can seriously reduce the viscosity of polymkeric substance, have to greatly improve the working concentration of polymkeric substance for reaching required viscosity, the comprehensive cost that makes to recover the oil improves; 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 the 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, generally be not used in tertiary oil recovery.While due to cationic and anionic surfactant, approaching the equal proportion mixing, its aqueous solution easily forms precipitation, thereby causes the cationic and anionic surfactant mixed system not only in application, to become incompatibility, and correlation theory research also relatively lags behind.Research is in recent years found, the cationic and anionic surfactant mixed system aqueous solution has a lot of anomalous properties, as existed the interaction between strong electrostatic interaction and hydrophobicity carbochain in the aqueous solution due to cationic and anionic surfactant, promoted two kinds to be with the interionic association of different charged surface promoting agents, be easy to form micella in solution, produce the surfactivity higher than single tensio-active agent.In addition, the cationic and anionic surfactant mixed system can obviously reduce the absorption loss of cats product on rock core, thereby can significantly reduce the inherent defect of cats product.
Gong Yujun etc. (seeing volume the 1st phase Northwest University's journal (natural science edition) February the 30th in 2000,28～31) research thinks that cetyl trimethylammonium bromide (CTAB) and sodium lauryl sulphate (SDS) mixed system have solublization.In the oil production process, utilize the solublization can " displacement of reservoir oil ", by under the oil wash sticked on the sandstone of rock stratum, thereby improve oil recovery.Huang Hongdu etc. (seeing oil and gas journal the 29th the 4th phase of volume of August in 2007,101～104) have studied the interfacial tension of the anion surfactant such as sulfonated petro-leum, petroleum carboxylate, alkylbenzene sulfonate and cetyl trimethylammonium bromide, alkali compound system and drawn to draw a conclusion: adding of cats product improves the interfacial activity of petroleum carboxylate, alkylbenzene sulfonate, sulfonated petro-leum.
Above-mentioned result of study shows that yin, yang ionic surface active agent compound system has certain effect for reduction oil water interfacial tension, raising oil displacement efficiency.But the former result of study shows its interface performance and still have much room for improvement, the latter has still adopted alkali in system, thereby can't avoid alkali to bring injury to stratum and oil well, the problems such as etching apparatus and 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 yin, yang ionic surface active agent mixed system result of study, adopt on the other hand the Anionic-nonionic tensio-active agent to replace traditional anion surfactant, the easy shortcoming such as precipitation while having overcome cationic anionic surfactant combination, invented cats product and the Anionic-nonionic surfactant composition used for the displacement of reservoir oil.
Summary of the invention
One of technical problem to be solved by this invention is that existing tensio-active agent oil displacement efficiency in the tertiary oil recovery process is poor, simultaneously because flooding system contains mineral alkali, injury is brought in stratum and oil well, the problem of etching apparatus and pipeline and breakdown of emulsion difficulty, a kind of new surfactant oil displacement composition is provided, said composition has that interfacial activity is high, the washing oil ability is strong, system is simple, can not bring injury to stratum and oil well, can 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 oil displacement composition and method of making the same, 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, wherein cats product is selected from least one in quaternary ammonium salt or quaternary amine alkali, and Anionic-nonionic surfactant molecule general formula is:
Wherein M is any one in basic metal, alkaline-earth metal or ammonium radical ion, and R is H, C
1～C
20Alkyl, aryl, COOM or SO
3Any one in M, R ' is C
1～C
10Alkyl, n is any one integer in 0～15, m is any one integer in 0～15, oxyethyl group polymerization degree X is any one integer or the decimal in 0.1～100.
In technique scheme, described cats product preferred version is selected from least one in tetra-alkyl ammonium chloride or tetra-alkyl ammonium hydroxide; In described Anionic-nonionic tensio-active agent, positively charged ion M preferred version is selected from Na, K, Mg, Ca or NH
4 +In any one; Described substituent R preferred version is H, C
5～C
15Alkyl, aryl, COOM or SO
3Any one in M; Described spacer R ' preferred version is C
1～C
5Alkyl; Described m, n preferred version are any one integer in 0～10; Oxyethyl group polymerization degree X preferred version is any one integer or the decimal in 1～20; The mol ratio preferred version 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: the preparation method of surfactant composition for a kind of chemical displacement of reservoir oil comprises the following steps:
A) pure ether sulfonate or alcohol ether carboxylate and halogeno-benzene derivative, catalyzer are added to reactor, 80～200
oC reaction 1～20 hour, wherein pure ether sulfonate or alcohol ether carboxylate and halogeno-benzene derivative mol ratio are 1:2～5, then thin up with, and carry out oily water separation, water obtains the Anionic-nonionic tensio-active agent.
B) cats product is reached to the Anionic-nonionic tensio-active agent obtained according to step a and be dissolved in the water respectively, then within 1: 0.1～1: 10, mix according to mol ratio.
In technique scheme, described catalyzer preferred version is selected from least one in NaOH or KOH.
Surfactant oil displacement composition of the present invention is on the one hand due to strong electrostatic attraction effect between yin, yang ionic surface active agent opposite charges polar group, make surfactant molecule adsorptive capacity on interface increase, micelle-forming concentration significantly reduces, thereby has the incomparable high surface of single tensio-active agent; Due to the interfacial activity of surfactant composition superelevation, its aqueous solution can form ultra low interfacial tension with crude oil, thereby effectively overcomes the force of cohesion between crude oil, is conducive to the outflow of crude oil, and then significantly improves oil displacement efficiency simultaneously.Surfactant composition can change the oil reservoir wettability of the surface on the other hand, as the cats product in composition by the electronegative Interaction of substituents with being adsorbed on solid surface, its desorption is got off, making glossy wet surface modification is intermediate wet or water-wet surface, reduce the work of adhesion of crude oil at solid surface, thereby be conducive to peeling off of crude oil.Yin, yang ionic surface active agent mixing solutions has solublization to crude oil simultaneously, can, further by under the former oil wash sticked on the sandstone of rock stratum, improve oil recovery factor.
Adopt surfactant composition of the present invention in the tertiary oil recovery process, have 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; The washing oil ability is strong: surfactant composition surpasses 40% to the washing oil rate of crude oil; The surfactant composition system is simple.Due to system, containing mineral alkali, thereby the problem of mineral alkali causes stratum while having avoided rig-site utilization injury, the corrosion that equipment is caused and the breakdown of emulsion difficulty that causes thus, obtained technique effect preferably.
Below by embodiment, the present invention is further elaborated.
Embodiment
[embodiment 1]
By CH
3(CH
2)
11(OCH
2CH
2)
0.1CH
2SO
3Na and 4-pentadecyl-chlorobenzene, NaOH add reactor, pass into N
2To pressure be 15kg/cm
2, in 200
oC reaction 1 hour, wherein CH
3(CH
2)
11(OCH
2CH
2)
0.1CH
2SO
3Na:4-pentadecyl-chlorobenzene: the NaOH mol ratio is 1:5:2, then is diluted with water to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by etamon chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 0.1, obtain surfactant composition 1, its composition, structure are in Table 1.
[embodiment 2]
By CH
3(CH
2)
9(OCH
2CH
2)
1CH
2CH
2SO
3Na and 2-octyl group-bromobenzene, KOH add reactor, pass into N
2To pressure be 20kg/cm
2, in 160
oC reaction 4 hours, wherein CH
3(CH
2)
9(OCH
2CH
2)
1CH
2CH
2SO
3Na:2-octyl group-bromobenzene: the KOH mol ratio is 1:2:1.5, then adds ammoniacal liquor and is diluted to dissolving, and carry out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by palmityl trimethyl ammonium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 0.5, obtain surfactant composition 2, its composition, structure are in Table 1.
[embodiment 3]
By CH
3(CH
2)
10(OCH
2CH
2)
2.5(CH
2)
5SO
3Na and 3-isopentyl-chlorobenzene, KOH add reactor, pass into N
2To pressure be 20kg/cm
2, in 140
oC reaction 6 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
2.5(CH
2)
5SO
3Na:3-isopentyl-chlorobenzene: the KOH mol ratio is 1:3:1.5, then is diluted with water to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by phenyl trimethyl ammonium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 1.5, obtain surfactant composition 3, its composition, structure are in Table 1.
[embodiment 4]
By CH
3(CH
2)
12(OCH
2CH
2)
20(CH
2)
3SO
3Na and p-chloro-phenylformic acid, KOH add reactor, pass into N
2To pressure be 20kg/cm
2, in 120
oC reaction 10 hours, wherein CH
3(CH
2)
12(OCH
2CH
2)
20(CH
2)
3SO
3Na: p-chloro-phenylformic acid: the KOH mol ratio is 1:2:2.5, then is diluted with water to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by stearyl dimethyl benzyl ammonium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 10, obtain surfactant composition 4, its composition, structure are in Table 1.
[embodiment 5]
By CH
3(CH
2)
10(OCH
2CH
2)
7(CH
2)
4SO
3Na and chlorobenzene, KOH add reactor, pass into N
2To pressure be 20kg/cm
2, in 100
oC reaction 15 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
7(CH
2)
4SO
3Na: chlorobenzene: the KOH mol ratio is 1:2:1.5, then adds 1%Mg (HCO
3)
2The aqueous solution is diluted to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by decyl triethyl ammonium hydroxide and the present invention 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 tensio-active agent mol ratio mixes at 1: 1.3, obtain surfactant composition 5, its composition, structure are in Table 1.
[embodiment 6]
By CH
3(CH
2)
7(OCH
2CH
2)
16CH
2SO
3The chloro-Phenylsulfonic acid of Na and 3-, KOH add reactor, pass into N
2To pressure be 20kg/cm
2, in 80
oC reaction 20 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
2.5(CH
2)
5SO
3Na:3-isopentyl-chlorobenzene: the KOH mol ratio is 1:2:3.0, then adds 1%Ca (HCO
3)
2The aqueous solution is diluted to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by Dodecyl trimethyl ammonium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 6, obtain surfactant composition 6, its composition, structure are in Table 1.
[embodiment 7]
By CH
3(CH
2)
10(OCH
2CH
2)
12CH
2SO
3Na and 4-phenyl-chlorobenzene, NaOH add reactor, pass into N
2To pressure be 30kg/cm
2, in 160
oC reaction 6 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
12CH
2SO
3Na:4-phenyl-chlorobenzene: the NaOH mol ratio is 1:4:2.5, then adds 1%Mg (HCO
3)
2The aqueous solution is diluted to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by tetrabutylammonium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 2, obtain surfactant composition 7, its composition, structure are in Table 1.
[embodiment 8]
By CH
3CH
2(OCH
2CH
2)
4(CH
2)
2SO
3Na with the chloro-Phenylsulfonic acid of 3-, NaOH are added to reactor, pass into N
2To pressure be 30kg/cm
2, in 120
oC reaction 12 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
2.5(CH
2)
5SO
3Na:3-isopentyl-chlorobenzene: the NaOH mol ratio is 1:4:3, then is diluted with water to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by distearyl dimethyl ammonium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 4, obtain surfactant composition 8, its composition, structure are in Table 1.
[embodiment 9]
By CH
3(CH
2)
10(OCH
2CH
2)
8CH
2SO
3Na and p-chloro-phenylformic acid, NaOH add reactor, pass into N
2To pressure be 30kg/cm
2, in 140
oC reaction 6 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
8CH
2SO
3Na: p-chloro-phenylformic acid: the NaOH mol ratio is 1:3:3, then is diluted with water to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by four octyl group ammonium chlorides and the present invention 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 tensio-active agent mol ratio mixes at 1: 8, obtain surfactant composition 9, its composition, structure are in Table 1.
[embodiment 10]
By CH
3(CH
2)
10(OCH
2CH
2)
7(CH
2)
2SO
3Na and 4-nonyl-chlorobenzene, NaOH add reactor, pass into N
2To pressure be 30kg/cm
2, in 100
oC reaction 15 hours, wherein CH
3(CH
2)
10(OCH
2CH
2)
7(CH
2)
2SO
3Na:4-nonyl-chlorobenzene: the NaOH mol ratio is 1:3:2, then is diluted with water to dissolving, and carries out oily water separation, and water obtains the Anionic-nonionic tensio-active agent.
Anionic-nonionic tensio-active agent prepared by benzyltriethylammoinium chloride and the present invention 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 tensio-active agent mol ratio mixes at 1: 1.5, obtain surfactant composition 10, its composition, structure are in Table 1.
[embodiment 11]
0.30wt% surfactant composition and 0.15wt% polyacrylamide (the molecular weight 2,600 ten thousand) aqueous solution of embodiment 5 preparations is even, obtain a kind of Polymer Used For Oil Displacement-surfactant complex.
Table 1 surfactant oil displacement composition forms and structure
[embodiment 12] surfactant interface performance test
Drip interfacial tensimeter with the TX-500C rotation and measure 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 2002 mg/L, Ca
2+Content 20 mg/L, Mg
2+Content 12.2 mg/L, the surfactant composition consumption is 0.3%.
Table 2 surfactant oil displacement composition and Shuan He oil field
5-11 series of strata oil water interfacial tension result
| Embodiment | Interfacial tension (mN/m) |
| 1 | 0.0095 |
| 2 | 0.0088 |
| 3 | 0.0055 |
| 4 | 0.0093 |
| 5 | 0.0002 |
| 6 | 0.0075 |
| 7 | 0.0021 |
| 8 | 0.0064 |
| 9 | 0.0005 |
| 10 | 0.0006 |
| 11 | 0.0040 |
As shown in Table 2, the compound surfactant of embodiment 1～10 preparation has good interface performance for Henan Oil Field.Embodiment 11 shows, after tensio-active agent prepared by the present invention and polymkeric substance are composite, its interface performance is still good.
The surfactant composition of embodiment 10 preparations is mixed with to 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 10 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 | 0.007 | 0.005 | 0.002 | 0.0009 | 0.0006 |
The above results shows, surfactant oil displacement composition of the present invention has very high interfacial activity for Henan Oil Field crude oil.
Drip interfacial tensimeter with TX-500C rotation and again measure the surfactant composition of embodiment 5 preparations and the Zhongyuan Oil Field three factory's oil water interfacial tensions that recover the oil.Measuring temperature is 80
oC, formation water salinity is 79439mg/L, Ca
2+Content 592 mg/L, Mg
2+Content 2871mg/L, dosage of surfactant is 0.3%.Oil water interfacial tension is 0.004mN/m, shows that tensio-active agent of the present invention is not only for the low mineralization oil reservoir, still has good interface performance for high temperature and high salt oil deposit, has advantages of that the scope of application is wide simultaneously.
[embodiment 13] surfactant composition washing oil aptitude tests
Get Shuanghe Oil Field
5-11 series of strata oil-sand, according to oil: sand=1:4 (weight ratio) 81
oAging 7 days of C, stir 5 minutes in every 2 hours; Then take out above-mentioned oil-sand 5g after aging, 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 | 65.3 |
| 2 | 63.9 |
| 3 | 47.6 |
| 4 | 60.3 |
| 5 | 46.2 |
| 6 | 54.4 |
| 7 | 48.5 |
| 8 | 61.3 |
| 9 | 55.1 |
| 10 | 52.2 |
The research of [embodiment 14] surfactant composition Oil Displacing Capacity
In length, be 30 centimetres, 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%, improve oil recovery factor and the results are shown in Table 5.
Table 5 surfactant composition oil displacement test result
| Embodiment | Improve recovery ratio % |
| 1 | 7.2 |
| 2 | 6.0 |
| 3 | 5.6 |
| 4 | 5.3 |
| 5 | 6.6 |
| 6 | 5.8 |
| 7 | 5.5 |
| 8 | 6.2 |
| 9 | 6.5 |
| 10 | 6.3 |
[comparative example 1]
According to Northwest University's journal (natural science edition) the 30th the 1st phase of volume of February in 2000, the methods such as 28～31 Gong Yu armies are mixed with mixed system (mol ratio 1:1.5) by cetyl trimethylammonium bromide (CTAB) and sodium lauryl sulphate (SDS), test respectively it 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 the 29th the 4th phase of volume of August 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 respectively it 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 (8)
1. a surfactant oil displacement composition, 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, wherein cats product is selected from least one in quaternary ammonium salt or quaternary amine alkali, and Anionic-nonionic surfactant molecule general formula is:
Wherein M is any one in basic metal, alkaline-earth metal, ammonium radical ion, and R is H, C
1～C
20Alkyl, aryl, COOM or SO
3Any one in M, R ' is C
1～C
10Alkyl, n is any one integer in 0～10, m is any one integer in 0～10, oxyethyl group polymerization degree X is any one integer or the decimal in 0.1～100.
2. surfactant oil displacement composition according to claim 1, is characterized in that described cats product is selected from least one in tetra-alkyl ammonium chloride or tetra-alkyl ammonium hydroxide.
3. surfactant oil displacement composition according to claim 1, is characterized in that in described Anionic-nonionic tensio-active agent, positively charged ion M is selected from Na, K, Mg, Ca or NH
4 +In any one.
4. surfactant oil displacement composition according to claim 1, is characterized in that described substituent R is H, C
5～C
15Alkyl, aryl, COOM or SO
3M.
5. surfactant oil displacement composition according to claim 1, is characterized in that described spacer R ' is C
1～C
5Alkyl.
6. surfactant oil displacement composition according to claim 1, is characterized in that described oxyethyl group polymerization degree X is any one integer or the decimal in 1～20.
7. the preparation method of the described surfactant oil displacement composition of claim 1 comprises following steps:
A) pure ether sulfonate or alcohol ether carboxylate and halogeno-benzene derivative, catalyzer are added to reactor, 80～200
oC reaction 1～20 hour, wherein pure ether sulfonate or alcohol ether carboxylate and halogeno-benzene derivative mol ratio are 1: 2～5, then add water or buck dilution, and carry out oily water separation, water obtains the Anionic-nonionic tensio-active agent;
B) cats product is reached to Anionic-nonionic tensio-active agent a) obtained according to step and be dissolved in the water respectively, then within 1: 0.1～1: 10, mix according to mol ratio.
8. the preparation method of surfactant oil displacement composition according to claim 7, is characterized in that described catalyzer is selected from least one in NaOH or KOH.
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