CN101407777B - Potsdam Bacillus brevis and use thereof - Google Patents
Potsdam Bacillus brevis and use thereof Download PDFInfo
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- CN101407777B CN101407777B CN2008102278603A CN200810227860A CN101407777B CN 101407777 B CN101407777 B CN 101407777B CN 2008102278603 A CN2008102278603 A CN 2008102278603A CN 200810227860 A CN200810227860 A CN 200810227860A CN 101407777 B CN101407777 B CN 101407777B
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- bacillus brevis
- brevibacillus borstelensis
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 45
- 239000002068 microbial inoculum Substances 0.000 claims abstract description 12
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- Micro-Organisms Or Cultivation Processes Thereof (AREA)
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Abstract
The invention discloses a Brevibacillus borstelensis Po CGMCC No. of 2441 and the application thereof. A microbial inoculum that contains the brevibacillus borstelensis Po CGMCC No. of 2441 also belongs to the extent of protection of the invention. Model oil displacing experiment results indicate that after the oil displacement with polymers, the brevibacillus borstelensis oil displacement can be used for raising the recovery factor by 3 to 5 percent (OOIP), the brevibacillus borstelensis oil displacement combined with a polymer protecting slug can be used for raising the recovery factor by about 7 percent (OOIP), and a brevibacillus borstelensis oil displacing method that is combined with chemical oil displacement can be used for raising the recovery factor by 6 to 13 percent (OOIP). The experiment results indicate that the strain can be widely applied into the field of oil exploiting industries and particularly into the field of enhanced microorganism oil exploiting, and is applicable to large-area popularization and application.
Description
Technical field
The present invention relates to the microbe oil production field, be specifically related to strain Potsdam bacillus brevis (Brevibacillusborstelensis) Po and the application in petroleum production engineering thereof.
Background technology
Oil is a kind of Nonrenewable energy resources, and in order to effectively utilize petroleum resources, the high efficiency method of recovery ratio is being sought to improve in countries in the world, is stranded in the crude oil that the stratum is difficult to exploit with conventional oil production method to exploit those.From the eighties in last century, a lot of countries have carried out with microbial process improves the oil recovery factor Study on Technology, and through the effort of two more than ten years, this technology has obtained very big progress.
The Daqing oil field polymer flooding is by country " eight or five ", " 95 " emphasis tackling of key scientific and technical problems, obtained breakthrough progress, enter into the industrialness application stage by pilot field test, recovery ratio improves about 10% than water drive, and annual production reaches more than 1,000 ten thousand tons.By the end of the year 2007,43 of polymer industry blocks are employed area and are reached 365.97Km
2, employ 5.95 hundred million tons of geologic reserve, become the great technical measures that Daqing oil field prolongs stable production period.However, still have nearly half crude oil not by extraction behind the polymer flooding in the oil reservoir.
According to above-mentioned situation, the researchist has proposed to utilize microorganism to combine with chemical flooding behind the polymer flooding, with further raising recovery ratio, so that the surplus oil to greatest extent behind the extraction polymer flooding, further increase the workable reserve in oil field, improve the ultimate recovery factor in oil field.As everyone knows, when polymkeric substance process reservoir, a part is adsorbed and is trapped on blowhole and the surface, and according to document announcement, the polymkeric substance of every cubic feet of reservoir delay reaches 22.7-45.4Kg.
Microorganism is injected the oil reservoir contain polymkeric substance, and microorganism can be at underground metabolic exhaustion polymkeric substance, and in the microflora of an external source of underground formation.Therefore, oil reservoir injection microorganism at polymer flooding has two advantages, the one, the process of microbiological degradation polymkeric substance can be removed effectively and stop up the oil bodying thing, the 2nd, after injection can utilize the microorganism of polymkeric substance, because microbial growth and metabolic process can produce organic acid, active substance and raising acid value for crude oil etc. and all help the material of the displacement of reservoir oil, and can discharge crude oil increase output.Therefore, this features on project is that microorganism has utilized the polymkeric substance in the oil reservoir to breed, and the material of the generation displacement of reservoir oil is to reach the purpose that improves recovery ratio.
Through update search and gathering information, U.S. Pat 4450908 (" reducing the biodegradable technology of polymer flooding ") has been introduced and has been driven the back at biological polymer and inject various microorganisms, and its defective is a mobility control difficulty of injecting microorganism; Another one is that the Phillips oil company has carried out the guiding test that microorganism is improved zone permeability in North Burbank development area, Oklahoma Osage county, and this oil field bottom temperature is 45 ℃.One of reason of selecting this oil field is that the eighties was once successfully implemented polyacrylamide/citric acid polymer treatment in this oil field, and its units increased in production is 9%.It is to utilize the interior indigenous microorganism of oil reservoir to inject nutrition agent continuously to make its activation that the microorganism of Pillips oil company is improved crude production patent technology, but its result does not report.
The example that utilizes the microbial flooding field test behind the domestic polymer flooding has only carried out the pilot field test of microbial flooding for the well group after 7 polymer floodings of adopting are annotated in Xisi, port district 3 during Dagang Oilfield year March October to 1999 nineteen ninety-five, homemade bacterium (Dagang Oilfield microbial oil displacement exploratory development development of projects reinjects behind i.e. elder generation's injection Micro-Bia bacterial classification BB, Liu Jinfeng, leading company of Dagang Oilfield group, 1997.8).
Analyze investigation data both domestic and external, discovery microbe oil production technology has been passed through the development of over half a century so far from nineteen twenty-six, but, after driving, polymerization utilize microorganism/chemical flooding further to improve the cutting edge technology that the recovery ratio exploratory development is the comparison tip, no matter desk research or test in place, only be to carry out preliminary exploration, the method for also not studying rule and can following.
Summary of the invention
The purpose of this invention is to provide a strain can utilize viscous crude behind the polymer flooding to improve Potsdam bacillus brevis of oil recovery factor.
Potsdam provided by the present invention bacillus brevis strain is (Brevibacillus borstelensis,) Po, this bacterial strain was preserved in the China Committee for Culture Collection of Microorganisms common micro-organisms center that is positioned at Da Tun road, Chaoyang District, BeiJing, China on 06 06th, 2008, and deposit number is CGMCC No.2441.
Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 is a Gram-positive bacillus, and cell dia≤1 μ m forms gemma, and gemma expands, and non-circular; Bacterium colony is creamy white, diameter 0.8-1.2 μ m; This bacterium grows under the amphimicrobian condition, growth temperature range: 45-50 ℃, and optimum growth temperature: 45 ℃; Growth potential of hydrogen scope: pH=6.4-7.8, optimal pH=7.0; The part biochemical characteristic is as shown in table 1:
The part biochemical characteristic of table 1 Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441
Annotate: "+" expression reacting positive; "-" expression reaction negative.
The microbial inoculum that contains Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 also belongs to protection scope of the present invention.
Described microbial inoculum contains Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 and nutrition base, and described nutrition base is by KH
2PO
40.5-1.0%, K
2HPO
40.75-1.5%, Na
2HPO
40.1-0.5%, (NH
4)
2SO
40.1-0.5%, CaCl
20.001% and FeSO
40.001% assembly forms.
Described Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 and nutrition basic weight amount portion rate are 1-10:100.
Especially, the nutrition base in the described microbial inoculum is the aqueous solution, pH 5.0-9.0.
Another object of the present invention is that Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 is applied in the petroleum production engineering field.Concrete application is:
Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 bacterium liquid can directly inject after polymer flooding, water drive and carry out the biological displacement of reservoir oil; Or
After polymkeric substance, water drive, directly inject Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 bacterium liquid, and carry out the biological displacement of reservoir oil with polymkeric substance protection slug; Or
After polymkeric substance, water drive, directly inject Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 bacterium liquid, and combine with chemical flooding, carry out the biological displacement of reservoir oil with polymkeric substance protection slug again.
In addition, the application of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 bacterium liquid reducing thick oil viscosity in the petroleum production engineering field also belongs to protection scope of the present invention.
Potsdam provided by the invention bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441.This bacterium is from grand celebration oil recovery factory polymer flooding piece sampling, and through repeatedly shaking table experiment, plate streaking separates, and again bacterial classification is carried out the utilized polymkeric substance that performance evaluation therefrom optimizes and the bacterial classification of crude oil.The principle that this bacterium is applied to the biological displacement of reservoir oil is: this bacterium can be under the condition that polymkeric substance and crude oil exist growth and breeding, and be the energy and the carbon source of growth with crude oil and polymkeric substance, utilize the self-replacation of bacterium and metabolic organic acid, organic solvent, tensio-active agent etc. to change the character of crude oil simultaneously, increase crude production rate.Have under the condition that polymkeric substance and crude oil exists in the oil reservoir anaerobism by simulation, this bacterial classification has been carried out 18 assays experiments, experimental result shows: 1) this bacterial classification can utilize polymkeric substance and crude oil to breed for carbon source for growth, and under reservoir condition well-grown; 2) by performances such as the interfacial tension of this strain fermentating liquid, fermented liquid organic acid content are estimated, determine this bacterial classification energy oxidative degradation crude oil and polymkeric substance, the ability that has the acid of producing and produce tensio-active agent, and make its viscosity degradation, variation has taken place in oil property after this bacterial classification effect, the stratographic analysis result proves that light component increases, and heavy component reduces relatively, ∑ C
21/ ∑ C
22Ratio has increased by 40.7%, C
21+ C
22/ C
28+ C
29Ratio has increased by 33.2%, interfacial tension between profit is reduced to 11.71mN/m by the 35.38mN/m of blank sample, the metabolic organic acid content of bacterial classification rises to 895mg/L by 300mg/L, the acid number of crude oil is increased to 0.073mg (KOH)/g by 0.015mg (KOH)/g after the bacterial classification effect, acid number has improved 3.9 times, wax content has reduced by 37.7%, gel content has reduced by 2.34%, depression of the freezing point 36.59%, Engler distillation just flow point has reduced by 76 ℃; 3) with newton index, viscosity variable quantity, the characteristic of this bacterial classification that improved the recovery ratio index assessment, the result shows that this bacterial classification has changed oil property, particularly changed the flowing property of crude oil effectively, make the character of the crude oil after the bacterial classification effect shift to newton's colloid, viscosity variable quantity parameter is higher, relative raising recovery ratio index is also higher, can think that this bacterial classification utilizes the better performances of crude oil; 4) be the characteristic that this bacterial classification of comprehensive evaluation adapts to oil reservoir, also carried out compatibility, pH value and toxicity test with oil reservoir origin bacterium, this bacterial classification is under the condition of polymkeric substance existence as a result, and viable count reaches 10
9-11Individual/mL, and the viscosity of polymkeric substance reduced to 11.4mPas by 18.6mPas; 5) model oil displacement experiment result shows, behind polymer flooding, improve the recovery ratio amplitude and reach 3-5% (OOIP) with this bacterium displacement of reservoir oil, behind polymer flooding, drive addition polymerization compound protection slug displacement of reservoir oil raising recovery ratio amplitude and reach 7% (OOIP) approximately with this bacterium, organic acid and tensio-active agent and the composite method of chemical surfactant-alkali of utilizing this bacterium to produce, can obtain lower interfacial tension, therefore the method for utilizing microbial flooding and chemical flooding to combine has proposed a new way for probing polymer drives back raising recovery ratio, and further verify by physical simulation experiment and to utilize behind the polymer flooding microorganism to combine the amplitude that further improves recovery ratio with chemical flooding, Physical simulation experiment adopts suitable microbial oil displacement can reach the purpose that improves recovery ratio after showing polymer flooding, the method displacement of reservoir oil that utilizes this bacterium to combine with chemical flooding behind polymer flooding improves the recovery ratio amplitude can reach 6-13% (OOIP), and model experiment shows better repeatability; 6) the expansion fermenting experiment result of this bacterial classification has proved that this bacterial classification can reach the productive capacity of design, can guarantee the batch process of this bacterial classification.Above-mentioned experimental result shows that this bacterial strain can be widely used in particularly microbial enhanced oil recovery field, petroleum production engineering field, suits large area to popularize and uses.
Below in conjunction with specific embodiment the present invention is described in further details.
Description of drawings
Figure 1A is the Electronic Speculum picture of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441
Figure 1B is the forward and backward crude oil color atlas of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Fig. 1 is the distribution situation of normal alkane carbon number in the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Fig. 2 is the changing conditions of the forward and backward former oil freezing point of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Fig. 2 A is the Engler distillation experimental result of each fraction oil-contg changing conditions of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Fig. 2 B is stable hydrocarbon, the aromatic hydrocarbons chromaticness analytical results of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect back crude oil
Fig. 3 is the changing conditions of the apparent viscosity of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect with shearing rate
Fig. 3 A is the bacteria concentration curve of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 under above-mentioned different carbon source conditions
Fig. 3 B is the forward and backward influence to polymer viscosity of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Fig. 4 is for injecting Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 in the flow curve figure of the crude oil of the forward and backward oil displacement experiment of artificial consolidated core model
Fig. 4 A is the oil displacement efficiency figure of microorganism behind the polymer flooding of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441
Embodiment
Method therefor is ordinary method if no special instructions among the following embodiment, and all percentage concentrations are mass percent concentration, and if no special instructions, water refers to distilled water or tap water.
Screening, cultivation and the preservation of embodiment 1, Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441.
Bacterium enrichment medium (g/L, the substratum that inorganic salt are composite): inorganic salt (KH
2PO
40.5-1.0%, K
2HPO
40.75-1.5%, Na
2HPO
40.1-0.5%, (NH4)
2SO
40.1-0.5%, CaCl
20.001% and FeSO
40.001%, crude oil 1-10%; Polymkeric substance (molecular weight 1,500 ten thousand) 0.05-0.1%, pH 6.8-7.5,121 ℃, sterilization 15-20min.45 ℃ of 120rpm shaking tables were cultivated 5-7 days.
Oil plate culture medium (g/L): KH
2PO
40.5-1.0%, K
2HPO
40.75-1.5%, Na
2HPO
40.1-0.5%, (NH
4)
2SO
40.1-0.5%, CaCl
20.001% and FeSO
40.001%, crude oil 1-10%; Polymkeric substance (molecular weight 1,500 ten thousand) 0.05-0.1%, agar 1.5-2.0%, pH6.8-7.5,121 ℃, sterilization 15-20min.
Slant medium (g/L): peptone 10, extractum carnis 3, sodium-chlor 5, water 1000mL, pH7.0-7.2.
The bacterial classification that screens not only must adapt to temperature, pressure, PH, the salinity of oil reservoir and detest envrionment conditionss such as foster, also must have outstanding degradation polymer and the ability of utilizing crude oil, with following method to Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 screen, cultivation and preservation, concrete grammar may further comprise the steps:
1, the screening of bacterial strain
Take a sample 256 from each oil recovery factory's polymer flooding piece of Daqing oil field, measure bacterial classification with method such as eliminate and utilized in the ability of crude oil and polymkeric substance and the oil-reservoir water characteristics such as origin bacterium compatibility, last optimization can be survived under the reservoir condition of polymers soln and crude oil existence, growth and breeding, and but metabolism produces organic acid, active substance, degrading crude oil is to improve the bacterial strain of recovery ratio, concrete grammar is: carry out enrichment culture with enrichment medium earlier, cultivated 7 days down at 45 ℃, utilize the characteristic that microorganism can emulsified crude oil then, the enrichment culture thing is inoculated on the oily flat board with the isolating method of line, under 45 ℃, place Switzerland's 400 type anaerobic box to cultivate 3-5 days, observe the form of bacterium colony then, select single bacterium colony of molten oil and do further research, the result tests through more than 300 shaking tables, initial gross separation goes out 142 strain bacterium behind the plate streaking, the single colony inoculation that to select from oily flat board is on slant medium then, under 45 ℃, place Switzerland concept400 type anaerobism incubator to cultivate 3-5 days, filter out the purpose bacterial strain, all belong to facultative anaerobe.A strain called after Po wherein, through identifying, its 16S rDNA has the nucleotide sequence of sequence 1 in the sequence table, prove that this bacterial strain is Potsdam bacillus brevis (Brevibacillus borstelensis), be Gram-positive bacillus, electron microscopic observation the results are shown in Figure 1A, cell dia≤1 μ m, form gemma, and non-circular; Its bacterium colony is creamy white, diameter 0.8-1.2 μ m; This bacterium grows under the amphimicrobian condition, growth temperature range: 45-50 ℃, and optimum growth temperature: 45 ℃; Growth potential of hydrogen scope: pH=6.4-7.8, optimal pH=7.0; The part biochemical characteristic is as shown in table 1.
2, cultivation and the preservation of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441
The shake-flask culture base of Potsdam bacillus brevis (Brevibacillus borstelensis) Po is identical with enrichment medium, and culture condition is shaking table shaking culture 7-15 days under 45 ℃, 150rpm.To the triangular flask of substratum be housed after aseptic preparation, in cultivating, shaking table can adopt two kinds of methods, a kind of is to observe the growing state of bacterium and the degree of emulsified crude oil in the shaking table shaking culture, another kind is nutrient solution to be put into the anaerobism incubator regularly allow bacterium fully contact with crude oil with the hand vibration every day, observes the colour-change situation of bacteriological action crude oil and fermented liquid simultaneously.This bacterial classification can be grown under above-mentioned two kinds of cultural methods as a result, proves that further Potsdam bacillus brevis (Brevibacillus borstelensis) the Po bacterial strain that is screened belongs to facultative anaerobe.
This bacterial strain was preserved in the China Committee for Culture Collection of Microorganisms common micro-organisms center that is positioned at Da Tun road, Chaoyang District, BeiJing, China on 06 06th, 2008, and deposit number is CGMCC No.2441.
The performance evaluation of embodiment 2, Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441
From following several respects the performance of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 of embodiment 1 acquisition is estimated:
1, the surfactivity of strain fermentating liquid is measured
With following method the oil extraction activity of the bio-surfactant of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 generation is measured: get culture dish, add water, add the 0.1-0.2mL normal alkane on the water surface and form oil film (under 45 ℃, carrying out), add the fermented liquid of the acquisition in embodiment 1 step 2 then at the oil film center.Form a circle around the center oil film is pressed against as a result, the diameter of circle is directly proportional with the content of tensio-active agent and activity, circle diameter through measuring this bacterial strain effect generation illustrates that greater than 3cm the fermented liquid after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 and crude oil, the polymkeric substance effect has higher surface activity.
2, the interfacial tension of strain fermentating liquid is measured
The TVT2 drop volume tonometer that adopts LAUDAR company to produce detects the interfacial tension of Potsdam short gemma bar (Brevibacillusborstelensis) Po CGMCC No.2441 fermented liquid.The result is as shown in table 2, assay surface tensile data, compare with the sample before the effect, after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, the interfacial tension lowering that profit is alternate, interfacial tension drops to 11.71mN/m by the preceding sample 35.38mN/m of effect, reduced rate 66.90%, the interfacial tension lowering amplitude of above-mentioned experimental result explanation Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 fermented liquid is bigger.
The interfacial tension of table 2 Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 fermented liquid
| Sequence number | The bacterium name | Density difference (g/mL) | Interfacial tension (mN/m) | Reduced rate (%) |
| 1 | Sample before the effect | 0.146 | 35.38 | |
| 2 | After the Po effect | 0.146 | 11.71 | 66.90 |
3, the organic acid content analysis of strain fermentating liquid
The capillary electrophoresis apparatus that adopts U.S. Hewlett-Packard Corporation to produce detects the organic acid content of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 fermented liquid.After Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, organic acid content rises to 895mg/L from minimum 300mg/L, proves through Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 oxidation crude oil to form various low molecular organic acidses.
The effect that embodiment 3, Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 form crude oil alkane
Detect the effect that Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 forms crude oil alkane, method: get the 250mL triangular flask earlier, adding oil sample 5-10g, Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 bacterium liquid 10mL (bacterial content〉10
7Cfu/mL) and behind the enrichment culture liquid 150mL, under 45-50 ℃, 150rpm, shake training 7-15 days, after cultivating end, collect fermented liquid, the centrifugal 15min dehydration of 3500rpm is carried out total hydrocarbon stratographic analysis (parallel detection 3 times) with Potsdam weak point method (the Gas Industry standard SY/T 5779-1995 of People's Republic of China (PRC) crude oil total hydrocarbon gas chromatography analysis method) to the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 effect.
The result shown in Figure 1B and table 3, by in the parameters of the total hydrocarbon stratographic analysis of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 effect of table 3 as can be seen, pristane/nC
17, phytane/nC
18It is the parameter of weighing biological degradation crude oil.Learn angle often pr/nC from oil generation
17, ph/nC
18Two ratio can be differentiated the degree of oil degradation as the important indicator of the biological degradation crude oil factor.These two ratios increase, and to be transformed into the amount of isoparaffin many more for normal paraffin in the crude oil, illustrate that crude oil has been increased flowability by the degraded of moderate range.According to professor Mei Bowen: " pr/ph ratio has reflected that also crude oil degrades under microbial process, redox reaction has taken place.Following the rule of chemical thermodynamics simultaneously.This is because C
19, C
20Under heat effect, can further degrade and form C
18, C
16Even C
15, this expresses high carbon number isoparaffin downward trend " and (plum blog article, New Advance in Reservoir Geochemistry, 1992).∑ C
21/ ∑ C
22Increased by 40.7%, C
21+ C
22/ C
28+ C
29Increased by 33.2%.In addition, from the forward and backward crude oil contrast color spectrogram Figure 1B of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect as can be seen, the main peak carbon number all shifts to the low carbon number scope owing to the thermal destruction of high-molecular weight hydrocarbon, and color atlas gradually becomes preceding high cutting edge of a knife or a sword type.Detected result shows that Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 has produced tangible oxidative degradation to the experiment oil sample, the content of the normal paraffin in the crude oil is reduced, isoparaffin (particularly low carbon number isoparaffin) content increases, this is to improving crude oil fluidity, reduce oil water interfacial tension and play an important role, have good displacement of reservoir oil effect.
The parameters of the total hydrocarbon stratographic analysis of the forward and backward crude oil of table 3 Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 effect
| Numbering | Sample | Pr/nC17 | Ph/nc18 | Pr/P h | OEP | ∑C 21----- ∑C 22 | Increment rate (%) | C 21+C 22------- C 28+C 29 | Increment rate (%) |
| 1 | Before the effect | 0.21 | 0.17 | 1.23 | 1.06 | 0.81 | / | 1.48 | / |
| 2 | After the Po effect | 0.20 | 0.18 | 1.16 | 1.10 | 1.14 | 40.7 | 1.97 | 33.2 |
1, detects the changing conditions of normal alkane carbon number in the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Detect the above-mentioned variation of normal alkane carbon number in the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, method is: normal paraffin parameter " ∑ C
21/ ∑ C
22" and " C
21+ C
22/ C
28+ C
29" be the parameter of describing oil-gas migration, also be to weigh the important indicator of microorganism to the crude oil effect.Generally from oil-gas migration parameter ∑ C
21/ ∑ C
22And C
21+ C
22/ C
28+ C
29Analyze, in the alkane parameter, determine C
21Be light constituent in the past, C
22Be heavy constituent, ∑ C so later on
21/ ∑ C
22And C
21+ C
22/ C
28+ C
29Ratio increase, the direction of expression oil migration is that macromolecular compound content reduces relatively, the light constituent compounds content increases relatively.As seen from Figure 1, with the effect before compare, after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 effect, the carbon number of normal alkane is from C in the crude oil
6-C
17Beginning in the past increases ∑ C
21/ ∑ C
22This value is 0.81 before the effect, is increased to 1.20 after the effect, C
21+ C
22/ C
28 +C
29This value is 1.48 before the effect, is increased to 1.93 after the effect, shows that long chain hydrocarbon content reduces relatively in the crude oil, and short hydrocarbon or low chain hydrocarbon content increase relatively, and this reduces oil water interfacial tension and play an important role improving crude oil fluidity, has good displacement of reservoir oil effect.
The carbon number distribution situation of the forward and backward crude oil normal alkane of table 4 Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 effect
| The carbon component | Oil sample content % before the effect | Effect back bacterial classification Po content % |
| C6 | / | / |
| C7 | / | 0.35 |
| C8 | / | 1.27 |
| C9 | / | 1.60 |
| C10 | 0.13 | 2.28 |
| C11 | 0.60 | 2.75 |
| C12 | 1.43 | 2.82 |
| C13 | 2.37 | 3.20 |
| C14 | 3.42 | 3.42 |
| C15 | 3.96 | 4.48 |
| C16 | 4.37 | 4.79 |
| C17 | 5.13 | 5.20 |
| C18 | 5.07 | 5.40 |
| C19 | 6.46 | 6.17 |
| C20 | 5.90 | 6.00 |
| C21 | 5.99 | 6.20 |
| C22 | 5.79 | 6.35 |
| C23 | 6.50 | 6.56 |
| C24 | 5.28 | 5.42 |
| C25 | 5.99 | 5.56 |
| C26 | 4.60 | 3.64 |
| C27 | 4.77 | 3.57 |
| C28 | 4.04 | 2.40 |
| C29 | 3.91 | 2.53 |
| ∑C 21/∑C 22 | 0.81 | 1.39 |
| C 21+C 22/C 28+C 29 | 1.48 | 2.45 |
2, detect the content of wax in the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, contain the glue changing conditions
With the post tswett's chromatography methods detect (by wax, colloid, asphalt content assay method in the oil and gas industry standard SY/T 7550-2000 of the People's Republic of China (PRC) crude oil) above-mentioned in the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 effect the content of wax, contain the glue changing conditions.The result is as shown in table 5, the wax content of crude oil reduces by 44% after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, in addition, the gel content of crude oil reduces by 38.7% after Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 effect, show that the Degradation of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 has not only changed the component and the structure of crude oil, the effect that also has reducing thick oil viscosity, and the reducing viscosity by emulsifying effect of its various meta-bolitess generations helps the exploitation and the conveying of oil.
The content of wax of table 5 in the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 effect, contain the glue situation
| Wax content % | Reduce % | Gel content % | Reduce % |
| Act on preceding 24.5 | / | Act on preceding 34.1 | / |
| Effect back Po 13.6 | 44.4 | Effect back 20.9 | 38.7 |
3, detection is through the changing conditions of the forward and backward former oil freezing point of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Detect (the Gas Industry standard SY/T 0541-1994 of People's Republic of China (PRC) condensation point of crude oil assay method) before Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect with the cold test method, the flow capacity of back crude oil, because the light component of crude oil increases after this bacterium effect, the flowability of the crude oil after this bacterial classification effect also will increase accordingly, detect before Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect for proving this result, the zero pour of back crude oil.The result as shown in Figure 2, the zero pour of crude oil is 41 ℃ before Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, zero pour after this bacterial classification effect is 26 ℃, depression of the freezing point 15 ℃, reducing percentage is 36.59%, shows that the flowability of crude oil after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect increases.
4, detection is through the changing conditions of each fraction oil-contg of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
With the changing conditions of Engler distillation method (State Standard of the People's Republic of China GB6536-86) detection through each fraction oil-contg of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect.The Engler distillation experimental result is shown in table 6 and Fig. 2 A, and when the temperature of flow process during at 100-160 ℃, the crude oil before the bacterial classification effect does not have fraction oil to distill, and tightly has the fraction oil of 0.4% volume to distill when temperature is raised to 180 ℃; But the crude oil after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect just has the fraction oil of 0.6% volume to distill since 100 ℃, and the initial distillation temperature of the fraction oil after this bacterial classification effect reduces by 80 ℃ by contrast.According to the regulation of refining of petroleum fraction oil, it is C that boiling point steams the cut that comes at 100-300 ℃
17Composition in the past, C
20-C
30It is solid paraffin, above-mentioned Engler distillation experimental result shows that the light component of crude oil after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect has increased, this experimental result conforms to above-mentioned stratographic analysis result, further long chain hydrocarbon content reduces relatively in the crude oil of proof after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, short hydrocarbon or low chain hydrocarbon content increase relatively, this is to improving crude oil fluidity, reduce oil water interfacial tension and play an important role, have good displacement of reservoir oil effect.
Table 6 is through the Engler distillation experimental result of the changing conditions of each fraction oil-contg of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 effect
| Temperature ℃ | Effect foreshot volume % | Effect after cut volume % | Increase |
| 100 | 0.6 | 0.6 | |
| 120 | 1.8 | 1.8 | |
| 140 | 2.5 | 2.5 | |
| 160 | 3.2 | 3.2 | |
| 180 | 0.4 | 4.8 | 4.4 |
| 200 | 2.0 | 6.5 | 4.5 |
| 220 | 4.5 | 7.8 | 3.3 |
| 240 | 7.1 | 8.9 | 1.8 |
| 260 | 10.0 | 11.6 | 1.6 |
| 280 | 12.8 | 13.5 | 0.7 |
| 300 | 17.5 | 17.7 | 0.2 |
| The total amount of heating up in a steamer | 20.4 | 20.7 | 0.3 |
5, through the changing conditions of the forward and backward acid value for crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
Change the ability of acid value for crude oil for observing acidic substance that Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 oxidation crude oil produces, adopt the changing conditions of the forward and backward acid value for crude oil of determination of acid-basetitration Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect.The result is as shown in table 7, the acid number of crude oil is 0.015mg (KOH)/g before Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 effect, acid number obviously improves after this bacterial classification effect, can reach 0.073mg (KOH)/g, show that the acid number of crude oil after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 effect is significantly improved.
Table 7 is through the measurement result of the forward and backward acid number of Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 effect
| Numbering | The sample title | Acid number mg (KOH)/ |
| 1 | Crude oil before the effect | 0.015 |
| 2 | After the Po effect | 0.073 |
6, through stable hydrocarbon, the analysis of aromatic hydrocarbons chromaticness of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC forward and backward crude oil of No.2441 effect
Form changes of chemical structures for the forward and backward crude oil of qualitative understanding Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, will after Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 effect, carry out the chromaticness analysis by stable hydrocarbon, the aromatic hydrocarbons of crude oil.The result is shown in Fig. 2 B, change has taken place in the crude oil structure after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, transformed other product by alkane, oxidizing reaction has taken place in the stable hydrocarbon after this bacterial classification effect, has produced propionic acid CH at retention time 438min
3CH
2COOH has produced octadecadienoic acid C at retention time 373min
17H
31COOH has produced hexadecanoic acid C at retention time 328min
15H
31COOH has analyzed the ethanamide CH in the degradation polymer simultaneously
3CONH
3The chromaticness analytical results of the aromatic hydrocarbons after this bacterial classification effect shows, has produced cyclohexadiene 1,4 diketone C at retention time 868min
14H
2OO
2, 898min has produced 3a in retention time, and the 7-methanogen has produced carbonic acid C at retention time 978min
6H
5OH, n-Hexadecane is as follows by the approach of bacterial metabolism:
H
3C-(CH2)
14-CH
3-→ H
3C-(CH
2)
14-CH
2OOH-→ H
3C-(CH
2)
14-CH
2OH-→ H
3C-(CH
2)
14-CHO-→ H
3C-(CH
2)
14-COOH ↓ hexadecanoic acid
Above-mentioned experimental result shows that change has taken place the crude oil structure after short bud genus bacillus (Brevibacillus borstelensis) the PoCGMCC No.2441 effect of Potsdam, has transformed other product by alkane.
7, through the changing conditions of the forward and backward crude oil group composition of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC forward and backward crude oil of No.2441 effect
Be the effect situation of quantitative understanding Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441, detect the percentage composition of each component of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC forward and backward crude oil of No.2441 effect family the stable hydrocarbon in the crude oil, aromatic hydrocarbons, nonhydrocarbon and bituminous matter component.The result is as shown in table 8, very big variation has taken place in Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect back group composition in crude oil as a result, saturated hydrocarbon content increases relatively, the content of aromatic hydrocarbons fluctuates, nonhydrocarbon is relative with asphalt content to be reduced, illustrate that this bacterial strain can change every component of crude oil, promptly produced tangible oxidative degradation, the bitum content of heavy constituent in the crude oil is reduced, oxide content in the non-hydrocarbon component increases, and these oxide compounds that increase mostly are the organic acid that molecular weight varies in size, pure and mild esters etc. have surface-active material, and this plays crucial effect to crude oil mobile in porous medium.
Table 8 is through the changing conditions of the forward and backward crude oil group composition of Potsdam bacillus brevis (Brevibacillus borstelensis) forward and backward crude oil of PoCGMCC No.2441 effect
| Numbering | The sample title | Stable hydrocarbon (%) | Aromatic hydrocarbons (%) | Nonhydrocarbon (%) | Bituminous matter (%) |
| 1 | Crude oil before the effect | 61.57 | 17.82 | 17.00 | 3.62 |
| 2 | After the Po effect | 78.06 | 13.32 | 8.07 | 0.55 |
8, through the forward and backward viscosity of crude of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC forward and backward crude oil of No.2441 effect, newton's index, viscosity variable quantity, raising recovery ratio index variation situation
8.1 Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect is forward and backward to the changing conditions of viscosity of crude with shearing rate
With the German HAAKE RS150 of company type rheometer measurement at range of shear rate 0.01-1000s
-1, rotor C35/2
0, temperature is forward and backward to the changing conditions of crude oil apparent viscosity with shearing rate through Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect under 45 ℃ of conditions, parallel detection three times.The result as shown in Figure 3, before Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 effect, the apparent viscosity (μ=KD of crude oil
N-1) show as the characteristic of pseudoplastic fluid, after this bacterium was handled, the apparent viscosity of crude oil then was tending towards the Newtonian fuid characteristic.
8.2 through the forward and backward crude oil newton of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC forward and backward crude oil of No.2441 effect index, viscosity variable quantity, raising recovery ratio index variation situation
Shearing rate from step 1 and viscograph are as can be seen, the flowing property of crude oil and viscosity are along with shearing rate changes, under identical temperature, the viscosity of crude of handling through Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 improves, viscosity of crude reduces with the increase of shearing rate, when shearing rate reaches certain numerical value, viscosity of crude after this bacterial classification effect is tending towards a straight line, belong to false fluid, not to water and kerosene during when shear rate change viscosity be constant.After Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, reduced the content of long chain molecule in the crude oil, make crude oil thinning, viscosity degradation has been shifted to Newtonian fuid with crude oil.Simultaneously, when long chain molecule was degraded in the crude oil, the volume of crude oil increased, and has formed water-in-oil or oil-in-water state, made newton's index, viscosity variable quantity, the raising recovery ratio index of crude oil that variation take place.According to (Alejandro Maure etal:Waterflooding Optimization Using Biotechnology:2-Year Field Test such as Alejandro Maure, LaVentana Field Argentina, SPE69650, method p34.) is estimated Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 to improving the contribution index (EOR) of oil recovery.This method is with the foundation of viscosity reducing effect as experimental strain performance evaluation, minimum and maximum apparent viscosity value by being determined in the given shearing rate interval, and to whole apparent viscosity data of recording in given shearing rate interval statistics of suing for peace, use newton's index, viscosity variable quantity and raising recovery ratio index this bacterial classification is carried out comprehensive evaluation, three parameter lists are understood the feature that crude oil changes, and calculation formula is as follows:
Newton's index: Newtonian Inde *=fn{Viscosity of the Control/Viscosity of theInoculate}=(control vis.@min.shear rate-control vis.@ma * .shear rate)/(inoculate vis.@min.shear rate-inoculate vis.@ma * .shear rate)
Annotate: it indicates the quality of the Newtonian fuid of handling back crude oil, generally this index〉1.5 for well.
Viscosity variable quantity: delta Viscosity=(∑ control vis.-∑ microbe inoculated vis.)/∑ control vis.
Annotate: the viscosity intensity of variation of crude oil before and after its mark is being levied and handled, generally with 〉=0.01 for well.
Improve the recovery ratio index: EOR Inde *=1/ (1-delta Viscosity)
Annotate: it shows that potential increases the size of recovery ratio, generally with 〉=1.15 for well.
The result is as shown in table 9, after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 effect, newton's index of crude oil is significantly improved, the relative viscosity variable quantity also is improved, show that improving the recovery ratio index also is largely increased, can think that this bacterial classification utilizes the better performances of crude oil, further specify the character that after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect, has changed crude oil effectively, increased the flow capacity of crude oil.
Table 9 is through newton's index, viscosity variable quantity, the raising recovery ratio index variation situation of the forward and backward crude oil of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 effect
| Numbering | Title | Newton's index NewtonianInde * | Viscosity variable quantity deltaViscosity | Raising recovery ratio index E ORInde * |
| 1 | Oil before the |
1 | 0.00 | 1 |
| 2 | After the Po effect | 4.09 | 0.68 | 3.13 |
9, the compatibility of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 and oil reservoir origin bacterium experiment
The ability that adapts to oil reservoir for comprehensive evaluation Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441, carried out the compatibility experiment of this bacterium and oil reservoir origin bacterium, method is: take a sample respectively from each test site (factory, two factories, three factories, four factories, six factories) of oil field polymer injection, with the screening purpose bacterium-Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 bacterium liquid 10mL (bacterial content〉10
7Cfu/mL) carry out the compatibility experiment, observe the growing state of purpose bacterium.The result is as shown in table 10, cultivate altogether after microscopic examination, Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 is a dominant bacteria, well-grown, this is from oil reservoir output water, so can be compatible mutually with the origin bacterium in the oil reservoir because of this bacterial screening.In addition, from experimental result as can be seen, the external source bacterium of injecting in reservoir media has formed stable microorganism system, and at the interface bacterial oxidation crude oil of profit contact, this oxidizing reaction has produced low-molecular-weight organism, and anerobe can then utilize organism growth, breeding, metabolism to form the round-robin biologic chain, so the viable count of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 generally can reach 10
8-9Individual/mL.
The compatibleness experiment of table 10 Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 and local water
| Sequence number | The water sample title | Bacterium several/mL | pH | Purpose bacterium title | Bacterium several/mL | Salinity mg/ | pH | |
| 1 | One |
10 2 | 8-9 | |
10 9 | 3965 | 6 | |
| 2 | Two |
10 2 | 11-12 | |
10 8 | 4968 | 8-9 | |
| 3 | Three |
10 2 | 8 | |
10 8 | 3722 | 5.5 | |
| 4 | Four |
10 2 | 8 | |
10 9 | 3509 | 6.5 | |
| 5 | Six |
10 2 | 8 | |
10 8 | 3610 | 6 |
10, detect the chemical experiment that Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 is subjected to pH value and toxic effect
In influencing microorganism growth and more metabolic biochemical parameters, the pH value influences the most serious, and growth and metabolic optimal ph are 4-9, secondly is the concentration of heavy metal.The pH value not only directly has influence on the growth and the metabolism of bacterial classification, the most important thing is also to have influenced the lyotropy of heavy metal.If the content of heavy metal arsenic, mercury, nickel, selenium substantially exceeds 10-15mg/L nutrition aequum, then heavy metal is very big to the toxicity of microorganism, is unfavorable for growth and the metabolism of bacterium.Any microorganism is improved oil recovery factor method and all requires available a large amount of nutrition, normally grows and carries out metabolism for bacterium.The Analysis Results of Water Quality of Daqing oil field is as shown in table 11, the concentration of the various heavy metal ion in the Daqing oil field oil-reservoir water all in the category of microorganism growth condition, therefore Potsdam of the present invention bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 can be in oil-reservoir water growth and breeding.
Table 11 joint station underwater gold belongs to ion content survey report (mg/L)
| Potassium ion | 2.69 | Iron ion | 2.8×10 -1 | Zine ion | 1.1×10 -1 |
| Sodium ion | 3.83×10 2 | Mn ion | 1.40×10 -1 | Strontium ion | 4.7×10 -1 |
| Calcium ion | 2.14×10 | The tweezer ion | / | Cupric ion | 2.0×10 -2 |
| Magnesium ion | 4.30×10 | Chromium ion | / | Chlorion | 2.0×10 -2 |
11, detect under the existence condition of polymkeric substance influence to Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 growth velocity
State rate for comparing the growth of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 under carbon water, hydro carbons, polymkeric substance condition, carried out the contrast experiment.The proliferative speed of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 in carbohydrate is very fast as a result, and the bacterium number density just reached 10 in 1 day
10-12Individual/mL; Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 in the substratum of crude oil and inorganic salt growth and breeding after 3 days the bacterium number density reach 10
9-12Individual/mL; Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 speed of growth in the substratum of polymkeric substance is slower, and the bacterium number density is 10 after 3 days
8-11Individual/mL.
Then, Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 was placed 3 months after the 3rd day in the substratum of polymkeric substance, detect the growth velocity of this bacterial classification, the bacterium number density reaches 10 as a result
6-7Individual/mL, illustrate that this bacterial classification in the polymkeric substance substratum, can also survive under the promptly nonnutritive condition; Again Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 is activated the bacterium number density with crude oil again and reach 10
8-12Individual/mL.This experimental result shows, in oil reservoir after Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 is carbon source with the polymkeric substance with polymkeric substance utilization fully, up to not degrading, when microbial nutrition was not enough, they were shifted to new food source crude oil and continue the breeding growth in other words.The bacteria concentration curve of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 under above-mentioned different carbon source conditions as shown in Figure 3A.
In addition, carried out this bacterial classification and tested for considering influence that different polymer concentrations are stated rate to Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 growth with the coupling of different polymer concentrations, its objective is and observe the growth velocity of this bacterial classification under different polymer concentration conditions, method is: with bacterial classification Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 add crude oil respectively, polymers soln (among 200-2000mg/L), is observed the variation of its growth rate.The result is as shown in table 12, and polymer concentration growth to this bacterium in the 200-600mg/L scope there is not influence, and viable count reaches 10
10-11Individual/mL, when polymer concentration reached 1600-2000mg/L, viable count reached 10
8Individual/mL, show owing to polymer concentration is too high to have produced shielding effect that this bacterium breeds slowly with this understanding, but can both decomposing copolymer, the just problem of time.
Table 12 polymer concentration is to the influence of Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 bacterium number
| Polymer concentration (ppm, mg/mL) | The bacterium number (individual/mL) |
| 200 | 2.7×10 11 |
| 400 | 2.1×10 11 |
| 600 | 1.4×10 11 |
| 800 | 2.1×10 10 |
| 1000 | 5.5×10 10 |
| 1200 | 6.7×10 9 |
| 1400 | 9.2×10 9 |
| 1600 | 2.3×10 9 |
| 1800 | 7.5×10 8 |
| 2000 | 4.2×10 8 |
Also detected the influence of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 to polymkeric substance (concentration 1800ppm) viscosity simultaneously, the result is shown in table 13 and Fig. 3 B, and viscosity is degraded to 1.10mPas by 18.6mPas.
Table 13 Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 is to the influence of polymer viscosity
Experiment one: direct water drive+notes microbial flooding model oil displacement experiment behind the polymer injection
Model: research vehicle is artificial inhomogeneous consolidated core, variation coefficient Vk=0.72, the long cm=31.1-31.3 of model, sectional area cm
2=12.38-12.46.
Experimental water, oil: the saturation water of experiment usefulness is that (prescription is: NaCl0.3977% CaCl by the artificial salt solution of preparing of the average local water of Daqing oil field
20.0028%, MgCl
26H2O 0.0046%, Na
2SO
40.0093%, NaHCO
30.2634%), salinity is 6778mg/L.Experiment is a crude oil of taking from the Bei2Qu of three factories-J5--P25 well with oil, and the viscosity of crude oil is 47.2mPas after dewatering.Injecting water is the injection water of three factory's polymkeric substance injection stations.
Bacterium liquid is used in experiment: be single bacterium Potsdam bacillus brevis (Brevibacillus borstelensis) PoCGMCC No.2441 bacterium liquid.
The experiment polymkeric substance: polyacrylamide, molecular weight 1,400 ten thousand, solid content 0.88%, degree of hydrolysis 23mol%, viscosity is 50.2mPas.
Experimentation: rock core is found time, and saturated local water → saturated oil → water drive is moisture to reach that 100% → polymer injection (1000mg/L) 0.57PV → water drive is moisture to reach 100% → with the bacterium dense 10 of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 original bacteria liquid
9-10Individual/mL is diluted to 10
6-7Individual/mL, annotate then that bacterium liquid 0.2PV → 7 days → water drive of 45 ℃ of constant temperature culture is moisture reaches 100%, finish experiment.
Oil displacement experiment carries out on 4 blocks of rock cores, and per two is one group of parallel sample, has done two group model oil displacement experiments altogether, and bacterium liquid has used Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441.In addition, (M * Y) done the rheological analysis displaces the viscosity variation between next crude oil in crude oil before the observation injection model and the model will to displace next crude oil centrifuge dehydration and the crude oil before the injection model from the microbial oil displacement model.
The microbial oil displacement effect is shown in Fig. 4 A behind the polymer flooding, water drive and microbial oil displacement model data are as shown in table 14 behind the polymer flooding, by the model experiment data as can be seen, the amplitude that two parallel samples of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 improve recovery ratio is 3.84-4.09%, analyzing polymers drives and moisturely drops to 80% by 100% from model curve figure, microbial flooding is moisture to be dropped to about 90% by 100%, enough make moisture reduction after showing the effect of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 fermented liquid, recovery ratio improves.
Experimental result is analyzed, and the pH value of injecting water is 8, and the pH value of output water is 5-6 from model; When the follow-up water drive of model, observed the growth conditions of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 bacterial classification in model: viable count is 10 when model outlet output liquid 10mL
8Individual/mL, viable count is 10 during output liquid 45mL (0.5PV)
9Individual/mL, viable count is 10 during the terminal output liquid 90mL of model (1PV)
8Individual/mL.Viable count explanation bacterial migration from rock core output liquid is to whole rock core, because model is annotated bacterium liquid 0.2PV, in fact bacterium liquid only enters 1/5 place of model inlet, shifts to new food polymer carbon source behind near the nutrition bacterial classification consumes and carries out growth metabolism.
The rheological analytical results is shown in Fig. 4 and table 15, crude oil after Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 effect is viscosity degradation along with the increase of shearing rate, viscosity break ratio reaches more than 50%, shows that Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 has oil displacement efficiency preferably.
Microbial oil displacement model data summary sheet behind table 14 polymer flooding
| Numbering | The bacterium liquid formula | Volume of voids mL | Porosity % | Rate of permeation * 10 -3μm 2 | Oil saturation % | Waterflood recovery efficiency factor % | Polymkeric substance EOR | MEOR％ | |
| 1 | Po | 96.09 | 24.07 | 1189 | 69.52 | 46.73 | 14.79 | 3.84 | |
| 2 | Po | 101.74 | 25.79 | 1256 | 66.98 | 40.56 | 14.99 | 4.09 | |
| 1 | Water drive | 95.05 | 24.56 | 1338 | 74.69 | 40.85 | 11.26 | 0.00 |
The relation of table 15 Potsdam bacillus brevis (Brevibacillus borstelensis) forward and backward viscosity of crude of PoCGMCC No.2441 injection model and shearing rate
| Shearing |
Oil viscosity (mPa.s) before the injection model | Model extraction oil viscosity (mPa.s) after the bacterial classification effect | Viscosity |
| 1 | 535 | 270 | 49.53 |
| 2 | 405 | 188 | 53.58 |
| 3 | 350 | 113 | 67.71 |
| 4 | 314 | 97 | 69.11 |
| 5 | 294 | 87 | 70.41 |
| 6 | 282 | 80 | 71.63 |
| 7 | 262 | 80 | 69.47 |
| 8 | 246 | 72 | 70.73 |
| 9 | 220 | 72 | 67.27 |
| 10 | 200 | 68 | 66.00 |
| 11 | 188 | 68 | 63.83 |
| 12 | 177 | 64 | 63.84 |
| 13 | 167 | 64 | 61.68 |
| 13 | 155 | 64 | 58.71 |
| 14 | 147 | 64 | 5646 |
| 15 | 143 | 64 | 55.24 |
| 16 | 131 | 63.1 | 51.83 |
| 17 | 131 | 61.8 | 52.82 |
| 18 | 127 | 59 | 53.54 |
| 19 | 125 | 57.1 | 54.32 |
| 20 | 124 | 55.6 | 55.16 |
Experiment two: directly water drive+notes microbial flooding model displacement of reservoir oil behind the polymer injection+polymkeric substance protection slug experiment
Model: identical with experiment one.
Experimental water, oil, bacterium liquid: identical with experiment one.
Polymkeric substance: polyacrylamide, the molecular weight 1,400 ten thousand of polymkeric substance, solid content 0.88%, degree of hydrolysis 23mol%, viscosity is 50.2mPas or 22.4mPas.
Experimentation: (1) rock core moisture 100% → polymer injection (1000mg/L) 0.57PV (molecular weight 14,000,000 of polymkeric substance that reaches of saturated local water → saturated oil → water drive of finding time, solid content 0.88%, degree of hydrolysis 23mol%, viscosity is 50.2mPas) → water drive is moisture to reach 100% → with the bacterium dense 10 of Potsdam bacillus brevis (Brevibacillusborstelensis) Po CGMCC No.2441 original bacteria liquid
9-10Individual/mL is diluted to 10
6-7Individual/mL, annotate bacterium liquid 0.2PV → notes 0.2PV polymer viscosity (50.2mPas) protection slug then to drive → 7 days → water drive of 45 ℃ of constant temperature culture is moisture to reach 100%, finishes experiment.
(2) rock core moisture 100% → polymer injection (1000mg/L) 0.57PV (molecular weight 14,000,000 of polymkeric substance that reaches of saturated local water → saturated oil → water drive of finding time, solid content 0.88%, degree of hydrolysis 23mol%, viscosity is 22.4mPas) → water drive is moisture to reach 100% → with the bacterium dense 10 of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCCNo.2441 original bacteria liquid
9-10Individual/mL is diluted to 10
6-7Individual/mL, annotate bacterium liquid 0.2PV → notes 0.2PV polymer viscosity (22.4mPas) protection slug then to drive → 7 days → water drive of 45 ℃ of constant temperature culture is moisture to reach 100%, finishes experiment.
Use (1) and respectively carried out two parallel oil displacement experiments of synthetic core with (2), experimental technique is identical with experiment one.Experimental result is shown in table 16.By testing two oil displacement efficiency more as can be seen greater than experiment one with experiment one table 14 data; major cause is to have added polymkeric substance protection slug after annotating microorganism (Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441); crude oil behind microbial process can both be aggregated thing and evenly advance; crude oil behind the microbial process is displaced in the rich productive set; improve swept volume, thereby increased displacement of reservoir oil amplitude.
In the process of experiment, also detected the viscosity of the forward and backward polymers soln of injection model.The original viscosity that the result tests two (1) the preflood polymers solns of model is 50.2mPas, slug is that to connect the viscosity that from model output liquid 0.5PV detects polymkeric substance with the 50mL graduated cylinder in the process of injection model be 16.5mPas to 0.57PV, polymers soln has filtered the back viscosity degradation more than 3 times by porous medium, viscosity when displacing 1PV is 2.0mPas, viscosity when continuing to displace 1.5-2PV is 0.0mPas, shows that polymkeric substance has been produced absorption and delay by rock and pore throat in oil reservoir.
To test two (1) and the experimental data of (2) compare, (1) the oil recovery amplitude of EOR% and MEOR% all is higher than (2), be that injection viscosity 50.6mPas because of the polymers soln of (1) is higher than due to the injection viscosity 22.4mPas of polymers soln of (2), (2) oil displacement experiment result deducts 0.68% of blank oil displacement experiment, and the displacement of reservoir oil amplitude that improve (2) is 11.29-9.4%.
Table 16 experiment two polymkeric substance drive back microorganism+polymkeric substance protection model experiment data
| Sample | Volume of voids mL | Porosity % | Rate of permeation * 10 -3μm 2 | Oil saturation ratio % | Waterflood recovery efficiency factor % | Polymkeric substance EOR % | Slug % behind the MEOR+ |
| (1) | 93.86 | 23.90 | 1329 | 75.6 | 40.14 | 16.91 | 11.97 |
| (2) | 93.86 | 23.90 | 1329 | 75.6 | 38.21 | 14.31 | 10.08 |
Experiment three: the directly water drive+notes microbial flooding model displacement of reservoir oil+chemical flooding+polymkeric substance protection slug experiment behind the polymer injection
Model, experimental water, oil, bacterium liquid are identical with experiment one.
Polymkeric substance: polyacrylamide, molecular weight 1,400 ten thousand, solid content 0.88%, degree of hydrolysis 23mol%, viscosity is 50.2mPas.
The prescription of ternary system: table agent sodium alkyl benzene sulfonate 0.1% alive, NaOH1.0%, polymer poly acrylamide 0.25%
Experimentation: rock core is found time, and saturated local water → saturated oil → water drive is moisture to reach that 100% → polymer injection (1000mg/L) 0.57PV → water drive is moisture to reach 100% → with the bacterium dense 10 of Potsdam bacillus brevis (Byevibacillusborstelensis) Po CGMCC No.2441 original bacteria liquid
9-10Individual/mL is diluted to 10
6-7Individual/mL, annotate bacterium liquid 0.2PV → notes ternary system 0.3PV → notes 0.2PV polymer viscosity (50.2mPas) protection slug then to drive → 7 days → water drive of 45 ℃ of constant temperature culture is moisture to reach 100%, finishes experiment.
For the amplitude of Microbial Model oil displacement experiment relatively, done the poly-back of driving with artificial heterogeneous core and directly annotated the .3PV ternary system and carry out the displacement of reservoir oil, after annotate the displacement of reservoir oil controlled trial that the 0.2PV polymkeric substance is protected slug again, experimental result is shown in table 17.
Behind table 17 polymer flooding+microorganism+chemical flooding+polymkeric substance protection slug model experiment data sheet
| Sample | Volume of voids ml | Porosity % | Rate of permeation * 10 -3μm 2 | Oil saturation ratio % | Waterflood recovery efficiency factor % | Polymkeric substance EOR% | MEOR+ ternary+back slug % |
| Po | 78.28 | 18.69 | 1368 | 66.90 | 40.34 | 10.66 | 16.90 |
| Contrast | 105.96 | 22.43 | 1345 | 77.38 | 41.46 | 10.36 | 3.66 |
See that from above-mentioned experimental data the poly-back of driving annotated and continue the notes chemical flooding behind the microorganism and deduct 3.66% of controlled trial.Improving the recovery ratio amplitude is 13.24%.
Sequence table
<160>1
<210>1
<211>1437
<212>DNA
＜213〉Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441
<400>1
Claims (10)
1. Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441.
2. the microbial inoculum that contains Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441.
3. microbial inoculum according to claim 2 is characterized in that, contains Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 and nutrition base, and described nutrition base is by KH
2PO
40.5-1.0%, K
2HPO
40.75-1.5%, Na
2HPO
40.1-0.5%, (NH
4)
2SO
40.1-0.5%, CaCl
20.001% and FeSO
40.001% assembly forms.
4. microbial inoculum according to claim 3 is characterized in that, described Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 and nutrition basic weight amount portion rate are 1-10: 100.
5. according to claim 2 or 3 or 4 described microbial inoculums, it is characterized in that be the aqueous solution of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441, its pH value is 5.0-9.0.
6. Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 is in the petroleum production engineering Application for Field, be in oilfield exploitation after the direct water drive of polymkeric substance, the microbial inoculum that contains Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 that reinjects carries out microbial oil displacement.
7. application according to claim 6 is characterized in that: described microbial inoculum directly carries out microbial oil displacement after injecting.
8. application according to claim 6 is characterized in that: after described microbial inoculum injected, polymer injection protection slug carried out microbial oil displacement then again.
9. application according to claim 6 is characterized in that: described microbial inoculum is annotated ternary chemical flooding system after injecting again, and polymer injection protection slug carries out microbial oil displacement then again.
10. the application of Potsdam bacillus brevis (Brevibacillus borstelensis) Po CGMCC No.2441 reducing thick oil viscosity in the petroleum production engineering field.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108004166A (en) * | 2017-12-14 | 2018-05-08 | 中国科学院天津工业生物技术研究所 | A kind of microorganism species of efficient degradation PBAT plastic films |
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