CN107796914A - A kind of method of ultralow interfacial tension between rapid build biology surfactant and crude oil - Google Patents
A kind of method of ultralow interfacial tension between rapid build biology surfactant and crude oil Download PDFInfo
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Abstract
The invention belongs to technical field of tertiary oil recovery, and in particular to the method for ultralow interfacial tension, described construction method specifically include following steps between a kind of rapid build biology surfactant and crude oil：Test field sampling and the water-oil separating of block；Test the measure of the equivalent alkane number of block crude oil；The selection of biosurfactant；The structure of ultralow interfacial tension compound system；The performance evaluation of compound system.The method of the invention can be directed to different blocks crude oil, rapid build biosurfactant compound system, realize ultralow interfacial tension.There is construction method of the present invention method simply, rapidly and efficiently to reduce the blindness of experiment, improve operating efficiency；The compound system of this method structure has the characteristics of interfacial tension is low, and Oil Displacing Capacity is strong, and interfacial tension is less than 10‑3MN/m, indoor logistics organizations improve recovery ratio and are more than 25%.
Description
Technical field
The invention belongs to technical field of tertiary oil recovery, and in particular to ultralow between a kind of rapid build biology surfactant and crude oil
The method of interfacial tension.
Background technology
It is the subject matter that oil field faces to improve recovery ratio, and reasonable development high temperature and high salt water-drive pool is to realize that stable yields increases oil
Important means.The chemical agent of application success in common oil reservoir, for high temperature and high salt water-drive pool, the structure and property of chemical agent
It can easily change, cause existing chemical surfactant not have due effect.Biosurfactant is by micro- life
Thing fermentation produces, and mainly has glycolipid and the major class of lipopeptid two.There is biosurfactant chemical method to be difficult to the function base synthesized
Group, possess that interface efficiency high, temperature-resistant anti-salt are strong, selectivity is good, should cost is low and the advantages that easily biological-degradable.Based on this, closely
Year over biological surfactant increasingly attract people's attention, be expected to the oilfield development process in low oil price period occupy a seat it
Ground.
In field use, generally by biosurfactant and other biological surfactant or chemical surfactant
It is used in combination, using the cooperative effect formed between them, produces ultralow interfacial tension, overcomes oil reservoir hole capillary force, solution
Except formation blockage, mobility of the enhancing crude oil in hole, the flow conductivity for increasing near wellbore zone, so as to improve recovery ratio.Mesh
Before, the construction method of biosurfactant composite oil-displacing system be by by different type biosurfactant it is compound after survey
Interfacial tension between examination and crude oil, answering for ultralow interfacial tension can be produced with crude oil so as to be filtered out from substantial amounts of mixed system
Close oil displacement system.Found through patent and literature search, on compounding structure ultralow interfacial tension between different type surfactant
The research report of system is less, the report such as Zhu Xian " the EACN values of interfacial tension scanning way of equation group measure paraffin " (JSUST
1993,16(2):171-175) on the basis of the interfacial tension scanning method of measure crude oil EACN (equivalent alkane number) value, one is proposed
Kind interfacial tension scanning equation group, tests the EACN values of paraffin, but do not provide the specific of screening ultralow interfacial tension system
Method.Zhu Pengfei etc. reports " rhanolipid as biosurfactant and its compound system interface behavior and the Mesoscopic simulation of property "
(chemical journal 2011,69 (20):2420-2426) utilize Mesoscopic simulation dissipative particle dynamics technique study Bio-surface active
Agent and chemical surfactant compounding study mechanism, give different structure rhamnolipid behavioral characteristic and its with conventional synthesis
The law of compound of chemical surfactant, but the relatively simple molecule of structure can only be used in simulations, it is difficult to the complicated knot of research
Compounding behavior between structure macromolecular, therefore do not have extensive dissemination.
Traditional ultralow interfacial tension construction method workload is very big and efficiency is extremely low, very big blindness be present.This
Outside, different blocks oil property differs greatly, and causes existing achievement in research to be difficult to instruct subsequent construction work so that structure
Biological surfactant ultralow interfacial tension system turns into a repetition and hard work.Therefore, it is necessary to develop a kind of for each
The method of class oil reservoir rapid build biological species surfactant ultralow interfacial tension system.
The content of the invention
A kind of rapid build biology surfactant and crude oil are provided it is an object of the invention to overcome the deficiencies in the prior art
Between ultralow interfacial tension method, this method passes through the equivalent alkane number of determination test block crude oil first；Secondly select different
The biosurfactant of equivalent alkane number；Again, crude oil and biosurfactant system are built；Finally carry out compound system
Performance evaluation.The method of the present invention is simple, structure speed is fast, accuracy is high, can significantly reduce the screening and assessment of interior
Work, and the system for forming ultralow interfacial tension between biological surfactant and crude oil can be built.
The method of ultralow interfacial tension between a kind of rapid build biosurfactant and crude oil, it is characterised in that specific
Comprise the following steps：
(1) field sampling and the water-oil separating of block are tested
(2) measure of the equivalent alkane number of block crude oil is tested
(3) selection of biosurfactant
(4) structure of ultralow interfacial tension compound system
(5) performance evaluation of compound system
Wherein, the field sampling of described experiment block and water-oil separating, are comprised the following steps that：Tested using sample bucket
The well head of block oil well carries out the collection of fluid sample, and the collection capacity of sample is 10~20L, is sent to experiment after the completion of collection in 4h
Indoor carry out water-oil separating and crude oil dewater treatment, obtain the crude oil of 1.0~3.0L experiment blocks.
The described equivalent alkane number N of experiment block crude oil measure, it is comprised the following steps that：
1. preparing crude oil solutions respectively with two kinds of organic solvents of dimethylbenzene and n-hexane, the mol ratio of crude oil is respectively 0,
0.1st, 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 and 1, more than 24h is placed after preparation, makes crude oil fully mixed with solvent
It is even；
2. using mass concentration as 0.1% SDBS (neopelex) solution, test molten with above-mentioned various crude oil
The interfacial tension of liquid；
3. drawing the interfacial tension scanning figure of crude oil-dimethylbenzene and crude oil-hexane solution and SDBS solution, draw respectively
Mol ratio of the crude oil in two kinds of solution when interfacial tension is minimum；
4. calculating the equivalent alkane number N of crude oil, N is determined by following formula：
Wherein, x1For the mol ratio of crude oil-xylene solution and SDBS solution interface tension force crude oil when minimum；x2Crude oil-just
The mol ratio of hexane solution and SDBS solution interface tension force crude oil when minimum.
The selection of described biosurfactant, it is comprised the following steps that：Two kinds of biosurfactants are selected, respectively
For A and B, wherein biosurfactant A equivalent alkane number N1More than the equivalent alkane number of crude oil, biosurfactant B
Equivalent alkane number N2Less than the equivalent alkane number of crude oil.
The structure of described ultralow interfacial tension compound system, specifically includes following steps：
1. the determination of biosurfactant mol ratio
Using equivalent alkane number can additive property, calculate biosurfactant A and B mol ratio, make biological surface
The equivalent alkane number of activating agent compound system is consistent with the equivalent alkane number of crude oil, and A and B mol ratio are true by formula below
It is fixed：
N=N1y1+N2y2
y1+y2=1
In formula：y1For the mol ratio of biological surfactant A；
y2For the mol ratio of biological surfactant B.
2. the preparation of surfactant compound system
According to the mol ratio of above-mentioned determination, the biological surfactant A and B of respective quality is weighed respectively, and is dissolved in water filling
In, biological surfactant A and B total mol concentration is 10mmol/L；Temperature be 30~40 DEG C, stir speed (S.S.) be 800~
Under the conditions of 1000rpm, 12~24h of standing obtains compound system after stirring 2~4h.
The performance evaluation of described compound system, including the evaluation of interfacial tension and the evaluation of Oil Displacing Capacity, specific steps
It is as follows：
1. the evaluation of interfacial tension
Compound system is tested using interfacial tensimeter and tests the interfacial tension between block crude oil, and test temperature is trial zone
The reservoir temperature of block, the rotating speed of rotor is 2000~5000rpm, 3 interfacial tension values of retest, is averaged.
2. the evaluation of Oil Displacing Capacity
Load and experiment block permeability identical back-up sand rock core；The stratum water of rock core vacuumizing, saturation testing block, meter
Calculate the PV (pore volume) of rock core；Saturated oils experiment block dehydration degassed crude, calculates the initial oil of rock core, stands 7d；Rock
Water drive of the heart, a water drive to rock core production fluid moisture content is with untill testing block oil well average moisture content, calculating a water
Drive recovery percent of reserves；Secondary water drive is carried out after injecting 0.3PV compound system, compound system is calculated and improves recovery ratio value.
Described biosurfactant is two kinds in rhamnolipid, lipopeptid and sophorolipid.
The present invention has the following advantages that compared with prior art and beneficial effect：
(1) existing surfactant ultralow interfacial tension system screening operation complexity is heavy, and efficiency is low, structure of the invention
Method can substantially reduce the lab screening time, improve operating efficiency；
(2) the characteristics of method of the invention is simple, workable, and accuracy is high；
(3) compound system of this method structure has the characteristics of interfacial tension is low, and Oil Displacing Capacity is strong, and interfacial tension is less than
10-3MN/m, indoor logistics organizations improve recovery ratio and are more than 25%；
(4) biological species surfactant used herein, there is biodegradable feature, chemical synthesis surface can be substituted
Activating agent is applied to oil field development, reduces pollution of the chemical agent to environment.
Brief description of the drawings
Fig. 1 is the interfacial tension scanning figure of experiment block H crude oil-dimethylbenzene and SDBS solution；
Fig. 2 is the interfacial tension scanning figure of experiment block H crude oil-hexane solution and SDBS solution；
Fig. 3 is the interfacial tension scanning figure of experiment block G crude oil-dimethylbenzene and SDBS solution；
Fig. 4 is the interfacial tension scanning figure of experiment block G crude oil-hexane solution and SDBS solution；
Fig. 5 is the interfacial tension scanning figure of experiment block L crude oil-dimethylbenzene and SDBS solution；
Fig. 6 is the interfacial tension scanning figure of experiment block L crude oil-hexane solution and SDBS solution.
Embodiment
Technical scheme is further described with reference to example.
Embodiment 1
Dong Xin oil recovery factories block H, 75 DEG C of reservoir temperature, permeability 650 × 10-3μm2, crude oil ground viscosity is
8761mPas, output water salinity are 55920mg/L, Ca2+/Mg2+Ion concentration is 3278mg/L, recoverable reserves 2.5 ×
104T, oil well average moisture content are 95.2%.Main development contradiction is the block at this stage：Viscosity of crude is big, and side water enlivens, oil
Water mobility ratio difference is big, and waterflood efficiency is low.Rise for the well water of the block, the produce reality of yield reduction, utilize this
The method structure biosurfactant composite oil-displacing system of invention, reduces the interfacial tension between crude oil and displacing fluid, reduces oil
Water mobility ratio, so as to effectively reduce the composite water cut of oil reservoir, improve oil recovery factor.Specific construction step is as follows：
1st, field sampling and the water-oil separating of block are tested
The collection of fluid sample is carried out in the well head of the block oil well using sample bucket, the collection capacity of sample is 10L, is adopted
It is sent to after the completion of collection in 4h in laboratory and carries out water-oil separating and crude oil dewater treatment, obtains the crude oil of the about 1.0L blocks.
2nd, the measure of the equivalent alkane number of block crude oil is tested
Respectively crude oil solutions are prepared with two kinds of organic solvents of dimethylbenzene and n-hexane, the mol ratio of crude oil is respectively 0,
0.1st, 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 and 1, more than 24h is placed after preparation, makes crude oil fully mixed with solvent
It is even；Using mass concentration as 0.1% SDBS solution, the interfacial tension with above-mentioned various crude oil solutions is tested；Draw crude oil-diformazan
The interfacial tension scanning figure of benzene and crude oil-hexane solution and SDBS solution, show that crude oil exists when interfacial tension is minimum respectively
Mol ratio in two kinds of solution.Test result is shown in attached Fig. 1 and 2.
Crude oil when can be seen that crude oil-xylene solution and minimum SDBS solution interface tension force from accompanying drawing 1 and accompanying drawing 2
Mol ratio x1For 0.4, the mol ratio x of crude oil-hexane solution and SDBS solution interface tension force crude oil when minimum2For 0.2.According to
FormulaThe equivalent alkane number N that crude oil is calculated is 18.
3rd, the selection of biosurfactant
Two kinds of biosurfactants of rhamnolipid and sophorolipid are selected, wherein, the equivalent alkane of rhamnolipid and sophorolipid
Hydrocarbon number N1、N2Respectively 24 and 14.
4th, the structure of ultralow interfacial tension compound system
According to formula N=N1y1+N2y2, the mol ratio for calculating rhamnolipid and sophorolipid is 4:6；Weigh respectively
0.2016g rhamnolipids and 0.387g sophorolipids, being prepared with deionized water makes the total mol concentration of rhamnolipid and sophorolipid be
10mmol/L；It it is 30 DEG C in temperature, under the conditions of stir speed (S.S.) is 800rpm, standing 12h obtains compound system F after stirring 2h1。
5th, the performance evaluation of compound system
(1) evaluation of interfacial tension
The interfacial tension tested using interfacial tensimeter between above-mentioned compound system and experiment block H crude oil, test temperature are
75 DEG C, rotor speed 5000rpm, 3 interfacial tension values of retest, average.Test result is as shown in table 1.
Interface tension test result between the different biosurfactant systems of table 1 and crude oil
As it can be seen from table 1 the interfacial tension between rhamnolipid or sophorose lipoprotein solution and crude oil is 10-2The mN/m orders of magnitude,
Respectively 3.7 × 10-2mN/m、2.6×10-2MN/m, illustrate to be used alone a kind of biosurfactant and be difficult to and crude oil
Between produce ultralow interfacial tension；And compound system F1Interfacial tension reach ultralow 10-3The mN/m orders of magnitude, it is 4.5 × 10-3mN/
m。
(2) evaluation of Oil Displacing Capacity
It is 650 × 10 to load permeability-3μm2Back-up sand rock core；The stratum water of rock core vacuumizing, saturation testing block H, meter
Calculate the PV of rock core；Saturation testing block H is dehydrated degassed crude, calculates the initial oil of rock core, stands 7d；Water drive of rock core,
Water drive calculates a water drive and adopted untill rock core production fluid moisture content is with experiment block H oil wells average moisture content 95.2%
Go out degree；Inject 0.3PV compound system F1Secondary water drive is carried out afterwards, is calculated compound system and is improved recovery ratio value.It the results are shown in Table
2。
The Physical simulation experiment of the different biosurfactant systems of table 2
From table 2 it can be seen that compound system F1It is 26.1% to improve recovery ratio value, hence it is evident that higher than rhamnolipid and sophorolipid
Raising recovery ratio value be 8.5% and 11.0%.Illustrate the compound system F built using the method for the invention1Not only have
Ultralow interfacial tension reaches 10-3The mN/m orders of magnitude, and oil displacement efficiency is good, and physical simulation experiment improves recovery ratio value and reached
26.1%.
Utilize the compound system F of the structure of the present invention1Field test is carried out in block H since in March, 2013, by the end of
In December, 2015, block oil well average moisture content drop-out value 82.3%, 12.9% is reduced, add up to increase oily 3912t, improve harvesting
Rate is 15.6%.
Embodiment 2
Bin Nan oil recovery factories block G, 82 DEG C of reservoir temperature, permeability 900 × 10-3μm2, crude oil ground viscosity is
3456mPas, output water salinity are 10538mg/L, recoverable reserves 7.5 × 104T, oil well average moisture content are 96.5%.
Main development contradiction is the block at this stage：Viscosity of crude is big, and oil and water mobility ratio difference is big, and waterflood efficiency is low.For the block
Well water rise, the produce reality of yield reduction, utilize the present invention method structure biosurfactant complex oil displacing
System, the interfacial tension between crude oil and displacing fluid is reduced, reduce oil and water mobility ratio, so as to effectively reduce the comprehensive water cut of oil reservoir
Rate, improve oil recovery factor.Specific construction step is as follows：
1st, field sampling and the water-oil separating of block are tested
The collection of fluid sample is carried out in the well head of the block oil well using sample bucket, the collection capacity of sample is 15L, is adopted
It is sent to after the completion of collection in 4h in laboratory and carries out water-oil separating and crude oil dewater treatment, obtains the crude oil of the about 3.0L blocks.
2nd, the measure of the equivalent alkane number of block crude oil is tested
Respectively crude oil solutions are prepared with two kinds of organic solvents of dimethylbenzene and n-hexane, the mol ratio of crude oil is respectively 0,
0.1st, 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 and 1, more than 24h is placed after preparation, makes crude oil fully mixed with solvent
It is even.Using mass concentration as 0.1% SDBS solution, the interfacial tension with above-mentioned various crude oil solutions is tested.Draw crude oil-diformazan
The interfacial tension scanning figure of benzene and crude oil-hexane solution and SDBS solution, show that crude oil exists when interfacial tension is minimum respectively
Mol ratio in two kinds of solution.Test result is shown in accompanying drawing 3 and 4.
From accompanying drawing 3 and 4 as can be seen that mole of crude oil-xylene solution and SDBS solution interface tension force crude oil when minimum
Compare x1For 0.5, the mol ratio x of crude oil-hexane solution and SDBS solution interface tension force crude oil when minimum2For 0.3.According to formulaThe equivalent alkane number N that crude oil is calculated is 16.
3rd, the selection of biosurfactant
Two kinds of biosurfactants of rhamnolipid and sophorolipid are selected, wherein, the equivalent alkane of rhamnolipid and sophorolipid
Hydrocarbon number N1、N2Respectively 24 and 14.
4th, the structure of ultralow interfacial tension compound system
According to formula N=N1y1+N2y2, the mol ratio for calculating rhamnolipid and sophorolipid is 2:8.Weigh respectively
0.1008g rhamnolipids and 0.516g sophorolipids, being prepared with deionized water makes the total mol concentration of rhamnolipid and sophorolipid be
10mmol/L；It it is 35 DEG C in temperature, under the conditions of stir speed (S.S.) is 900rpm, standing 24h obtains compound system F after stirring 2h2。
5th, the performance evaluation of compound system
(1) evaluation of interfacial tension
Compound system to be tested using interfacial tensimeter and tests the interfacial tension between block crude oil, test temperature is 82 DEG C,
Rotor speed is 3000rpm, 3 interfacial tension values of retest, is averaged.Test result is shown in Table 3.
Interface tension test result between the different biosurfactant systems of table 3 and crude oil
From table 3 it can be seen that the interfacial tension between rhamnolipid or sophorose lipoprotein solution and crude oil is 10-2The mN/m orders of magnitude,
Respectively 6.1 × 10-2mN/m、1.4×10-2MN/m, illustrate to be used alone a kind of biosurfactant and be difficult to and crude oil
Between produce ultralow interfacial tension；And compound system F2Interfacial tension reach ultralow 3.7 × 10-3mN/m。
(2) evaluation of Oil Displacing Capacity
It is 900 × 10 to load permeability-3μm2Back-up sand rock core；The stratum water of rock core vacuumizing, saturation testing block G, meter
Calculate the PV of rock core；Saturation testing block G is dehydrated degassed crude, calculates the initial oil of rock core, stands 7d；Water drive of rock core,
Water drive calculates a water drive and adopted untill rock core production fluid moisture content is with experiment block G oil wells average moisture content 96.5%
Go out degree；Inject 0.3PV compound system F2Secondary water drive is carried out afterwards, is calculated compound system and is improved recovery ratio value.It the results are shown in Table
4。
The Physical simulation experiment of the different biosurfactant systems of table 4
From table 4, it can be seen that compound system F2It is 28.3% to improve recovery ratio value, hence it is evident that higher than rhamnolipid and sophorolipid
Raising recovery ratio value be 11.4% and 9.3%.Illustrate the compound system F built using the method for the invention2Not only have
Ultralow interfacial tension reaches 10-3The mN/m orders of magnitude, and oil displacement efficiency is good, and physical simulation experiment improves recovery ratio value and is
28.3%.
Utilize the compound system F of the structure of the present invention2Field test is carried out in block G since in January, 2014, by the end of
In December, 2015, block oil well average moisture content drop-out value 81.0%, 15.5% is reduced, add up to increase oily 10125t, raising is adopted
Yield has reached 13.5%.
Embodiment 3
River mouth oil recovery factory block L, 80 DEG C of reservoir temperature, permeability 1200 × 10-3μm2, crude oil ground viscosity is
8756mPas, output water salinity are 9794mg/L, recoverable reserves 4.0 × 104T, oil well average moisture content are 97.2%.Should
Main development contradiction is block at this stage：Reservoir Permeability is high, and oil and water mobility ratio difference is big, and waterflood efficiency is low.For the block
Well water rise, the produce reality of yield reduction, utilize the present invention method structure biosurfactant complex oil displacing
System, the interfacial tension between crude oil and displacing fluid is reduced, reduce oil and water mobility ratio, so as to effectively reduce the comprehensive water cut of oil reservoir
Rate, improve oil recovery factor.Specific construction step is as follows：
1st, field sampling and the water-oil separating of block are tested
The collection of fluid sample is carried out in the well head of the block oil well using sample bucket, the collection capacity of sample is 20L, is adopted
It is sent to after the completion of collection in 4h in laboratory and carries out water-oil separating and crude oil dewater treatment, obtains the crude oil of the about 2.0L blocks.
2nd, the measure of the equivalent alkane number of block crude oil is tested
Respectively crude oil solutions are prepared with two kinds of organic solvents of dimethylbenzene and n-hexane, the mol ratio of crude oil is respectively 0,
0.1st, 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 and 1, more than 24h is placed after preparation, makes crude oil fully mixed with solvent
It is even.SDBS, solution using mass concentration as 0.1%, test and the interfacial tension of above-mentioned various crude oil solutions.Draw crude oil-two
The interfacial tension scanning figure of toluene and crude oil-hexane solution and SDBS solution, crude oil when interfacial tension is minimum is drawn respectively
Mol ratio in two kinds of solution.Test result is shown in accompanying drawing 5 and 6.
From accompanying drawing 5 and 6 as can be seen that mole of crude oil-xylene solution and SDBS solution interface tension force crude oil when minimum
Compare x1For 0.7, the mol ratio x of crude oil-hexane solution and SDBS solution interface tension force crude oil when minimum2For 0.4.According to formulaThe equivalent alkane number N that crude oil is calculated is 10.
3rd, the selection of biosurfactant
Two kinds of biosurfactants of sophorolipid and lipopeptid are selected, wherein, the equivalent alkane number N of sophorolipid and lipopeptid1、N2
Respectively 14 and 8.
4th, the structure of ultralow interfacial tension compound system
According to formula N=N1y1+N2y2The mol ratio for calculating sophorolipid and lipopeptid is 1:2.0.2150g is weighed respectively
Sophorolipid and 0.6906g lipopeptids, being prepared with deionized water makes the total mol concentration of sophorolipid and lipopeptid be 10mmol/L；In temperature
For 40 DEG C, under the conditions of stir speed (S.S.) is 1000rpm, standing 18h obtains compound system F after stirring 4h3。
5th, the performance evaluation of compound system
(1) evaluation of interfacial tension
Compound system to be tested using interfacial tensimeter and tests the interfacial tension between block crude oil, test temperature is 80 DEG C,
Rotor speed is 2000rpm, 3 interfacial tension values of retest, is averaged.Test result is shown in Table 5.
Interface tension test result between the different biosurfactant systems of table 5 and crude oil
As can be seen from Table 5, the interfacial tension between sophorolipid and lipopeptide solution and crude oil is 10-2The mN/m orders of magnitude, respectively
For 2.5 × 10-2mN/m、1.3×10-2MN/m, illustrate that a kind of biosurfactant, which is used alone, to be difficult to produce between crude oil
Raw ultralow interfacial tension；And compound system F3Interfacial tension reach ultralow 2.9 × 10-3mN/m。
(2) evaluation of Oil Displacing Capacity
It is 1200 × 10 to load permeability-3μm2Back-up sand rock core；The stratum water of rock core vacuumizing, saturation testing block L,
Calculate the PV of rock core；Saturation testing block L is dehydrated degassed crude, calculates the initial oil of rock core, stands 7d；Water of rock core
Drive, a water drive to rock core production fluid moisture content is with untill testing block L oil wells average moisture content 97.2%, calculating a water drive
Recovery percent of reserves；Inject 0.3PV compound system F3Secondary water drive is carried out afterwards, is calculated compound system and is improved recovery ratio value.As a result see
Table 6.
The Physical simulation experiment of the different biosurfactant systems of table 6
As can be seen from Table 6, compound system F3It is 29.2% to improve recovery ratio value, hence it is evident that higher than carrying for sophorolipid and lipopeptid
High recovery rate value is 10.8% and 12.7%.Illustrate the compound system F built using the method for the invention3Not only have ultralow
Interfacial tension reaches 10-3The mN/m orders of magnitude, and oil displacement efficiency is good, and it is 29.2% that physical simulation experiment, which improves recovery ratio value,.
Utilize the compound system F of the structure of the present invention3Field test is carried out in block L since in June, 2014, by the end of
In December, 2015, block oil well average moisture content drop-out value 85.6%, 11.6% is reduced, add up to increase oily 4920t, improve harvesting
Rate has reached 12.3%.
Claims (9)
1. a kind of method of ultralow interfacial tension between rapid build biosurfactant and crude oil, it is characterised in that specific bag
Include following steps：
(1) field sampling and the water-oil separating of block are tested；
(2) measure of the equivalent alkane number of block crude oil is tested；
(3) selection of biosurfactant；
(4) structure of ultralow interfacial tension compound system；
(5) performance evaluation of compound system.
2. the method for ultralow interfacial tension between rapid build biosurfactant according to claim 1 and crude oil, its
It is characterised by, the field sampling of described experiment block and water-oil separating, comprises the following steps that：Using sample bucket in experiment block
The well head of oil well carries out the collection of fluid sample, and the collection capacity of sample is 10~20L, is sent to after the completion of collection in 4h in laboratory
Water-oil separating and crude oil dewater treatment are carried out, obtains the crude oil of 1.0~3.0L experiment blocks.
3. the method for ultralow interfacial tension between rapid build biosurfactant according to claim 1 or 2 and crude oil,
Characterized in that, the described equivalent alkane number N of experiment block crude oil measure, it is comprised the following steps that：
(1) crude oil solutions are prepared with two kinds of organic solvents of dimethylbenzene and n-hexane respectively, the mol ratio of crude oil is respectively 0,
0.1st, 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 and 1, more than 24h is placed after preparation, makes crude oil fully mixed with solvent
It is even；
(2) using mass concentration as 0.1% SDBS solution, the interfacial tension with above-mentioned various crude oil solutions is tested；
(3) the interfacial tension scanning figure of crude oil-dimethylbenzene and crude oil-hexane solution and SDBS solution is drawn, obtains out-of-bounds respectively
Mol ratio of the crude oil in two kinds of solution when face tension force is minimum；
(4) the equivalent alkane number N of crude oil is calculated, N is determined by following formula：
<mrow>
<mi>N</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>4</mn>
<mo>+</mo>
<mn>2</mn>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<mn>6</mn>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
</mrow>
<mrow>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein, x1For the mol ratio of crude oil-xylene solution and SDBS solution interface tension force crude oil when minimum；
x2For the mol ratio of crude oil-hexane solution and SDBS solution interface tension force crude oil when minimum.
4. the method for ultralow interfacial tension between rapid build biosurfactant according to claim 3 and crude oil, its
It is characterised by, the selection of described biosurfactant, it is comprised the following steps that：Two kinds of biosurfactants are selected, point
Wei not A and B, wherein biosurfactant A equivalent alkane number N1More than the equivalent alkane number of crude oil, biosurfactant
B equivalent alkane number N2Less than the equivalent alkane number of crude oil.
5. the method for ultralow interfacial tension between rapid build biosurfactant according to claim 4 and crude oil, its
It is characterised by, the structure of described ultralow interfacial tension compound system, specifically includes following steps：
(1) determination of biosurfactant mol ratio
Using equivalent alkane number can additive property, calculate biosurfactant A and B mol ratio, make Bio-surface active
The equivalent alkane number of agent compound system is consistent with the equivalent alkane number of crude oil, and A and B mol ratio are determined by formula below：
N=N1y1+N2y2
y1+y2=1
In formula：y1For the mol ratio of biological surfactant A；
y2For the mol ratio of biological surfactant B；
(2) preparation of surfactant compound system
According to the mol ratio of above-mentioned determination, the biological surfactant A and B of respective quality is weighed respectively, and is dissolved in in water filling, is given birth to
Thing surfactant A and B total mol concentration are 10mmol/L；It it is 30~40 DEG C in temperature, stir speed (S.S.) is 800~1000rpm bars
Under part, 12~24h of standing obtains compound system after stirring 2~4h.
6. according to claim 1 or 5 between rapid build biosurfactant and crude oil ultralow interfacial tension method,
Characterized in that, the performance evaluation of described compound system, including the evaluation of interfacial tension and the evaluation of Oil Displacing Capacity.
7. the method for ultralow interfacial tension between rapid build biosurfactant according to claim 6 and crude oil, its
It is characterised by, the evaluation of the interfacial tension, comprises the following steps that：Utilize interfacial tensimeter test compound system and experiment block
Interfacial tension between crude oil, test temperature are the reservoir temperature of experiment block, and the rotating speed of rotor is 2000~5000rpm, are repeated
3 interfacial tension values are tested, are averaged.
8. the method for ultralow interfacial tension between the rapid build biosurfactant and crude oil according to claim 6 or 7,
Characterized in that, the evaluation of described Oil Displacing Capacity, is comprised the following steps that：Load and experiment block permeability identical back-up sand rock
The heart；The stratum water of rock core vacuumizing, saturation testing block, calculate the PV of rock core；Saturated oils experiment block dehydration degassed crude, meter
The initial oil of rock core is calculated, stands 7d；Water drive of rock core, a water drive to rock core production fluid moisture content and experiment block oil well
Untill average moisture content, a water drive recovery percent of reserves is calculated；Secondary water drive is carried out after injecting 0.3PV compound system, is calculated multiple
Recovery ratio value is improved with system.
9. the method for ultralow interfacial tension between rapid build biosurfactant according to claim 1 and crude oil, its
It is characterised by, described biosurfactant is two kinds in rhamnolipid, lipopeptid and sophorolipid.
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| CN114324692A (en) * | 2022-01-11 | 2022-04-12 | 中国科学院兰州化学物理研究所 | Separation method of crude oil characteristic components capable of generating ultralow interfacial tension with lauramidopropyl betaine |
| CN114836188A (en) * | 2022-04-21 | 2022-08-02 | 大庆华理生物技术股份有限公司 | Biological compound oil displacement system and application thereof |
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| CN114324692A (en) * | 2022-01-11 | 2022-04-12 | 中国科学院兰州化学物理研究所 | Separation method of crude oil characteristic components capable of generating ultralow interfacial tension with lauramidopropyl betaine |
| CN114324692B (en) * | 2022-01-11 | 2022-09-30 | 中国科学院兰州化学物理研究所 | Separation method of crude oil characteristic components capable of generating ultralow interfacial tension with lauramidopropyl betaine |
| CN114836188A (en) * | 2022-04-21 | 2022-08-02 | 大庆华理生物技术股份有限公司 | Biological compound oil displacement system and application thereof |
| CN114836188B (en) * | 2022-04-21 | 2023-11-07 | 大庆华理生物技术股份有限公司 | Biological composite oil displacement system and application thereof |
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