CN105201471A - Microbial enhanced oil recovery method - Google Patents
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- CN105201471A CN105201471A CN201510627563.8A CN201510627563A CN105201471A CN 105201471 A CN105201471 A CN 105201471A CN 201510627563 A CN201510627563 A CN 201510627563A CN 105201471 A CN105201471 A CN 105201471A
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Abstract
The invention discloses a microbial enhanced oil recovery method and belongs to the technical field of tertiary oil recovery. The method is characterized by comprising the following steps: 1, conducting displacement of reservoir oil through biosurfactant; 2, adjusting injection-production patterns; 3, conducting displacement of reservoir oil through indigenous microorganisms; 4, conducting oil recovery through microorganism single well huff-and-puff. According to the method, firstly, the biosurfactant is injected, so that the displacement efficiency of a water-driven oil reservoir is improved; then through adjustment of the injection-production patterns, the swept volume, in the oil reservoir, of the indigenous microorganisms is expanded; finally, through the microorganism single well huff-and-puff treatment, crude oil in the immediate vicinity of an oil well is displaced out, and thereby the purpose of further raising the recovery ratio of the oil reservoir is achieved finally. The method has the advantages that activator has the advantages of being wide in source, low in price and harmless to strata; the method is wide in oil reservoir application range and particularly suitable for an oil reservoir which is exploited in a water-driven mode and is medium and high in permeability; the process is simple, and the pertinence and operability are great; the field test effect is good, and the enhanced oil recovery rate is testified by field tests to be larger than 15.0%. Therefore, the method can be widely applied to the technical field of microbial enhanced oil recovery.
Description
Technical field
The invention belongs to technical field of tertiary oil recovery, be specifically related to a kind of method of microbe oil production.
Background technology
Microbial Enhanced Oil Recovery (MicrobialEnhancedOilRecovery) refers to the technology utilizing microorganism (mainly bacterium, ancient bacterium) and metabolite thereof to improve crude output and recovery ratio, compared with other tertiary oil recovery technologies, Microbial Enhanced Oil Recovery have applied widely, technique is simple, the feature such as good in economic efficiency, pollution-free, have a good application prospect, thus receive increasing concern.
Oil reservoir is developed due to long-period water drive, define local macropore, conventional water drive is difficult to improve recovery ratio further, therefore, implement microbial oil displacement for middle and high infiltration oil reservoir at present and generally first the stifled tune in deep is carried out to oil reservoir, after carry out microbial oil displacement, utilize on the one hand deep profile controlling to improve swept volume, utilize microbial oil displacement to improve displacement efficiency on the other hand.But what call blocked up in the method deep is polymer, because polymer price is high and refractory organics, cost is caused to increase and cause serious impact to follow-up water treatment; Meanwhile, follow-up microbial oil displacement due to oil reservoir deep and adjacent to oil well area sphere of action limited, therefore have impact on to a certain extent and improve recovery ratio amplitude.
Summary of the invention
Main purpose of the present invention is a kind of method providing microbe oil production for the deficiencies in the prior art, and first the method improves the displacement efficiency of water-drive pool by injecting biosurfactant; Then by the adjustment of flooding pattern, the swept volume of endogenous microbes in oil reservoir is expanded; The crude oil of adjacent to oil well area is displaced finally by microbial single well stimulation process; Thus finally reach the object improving oil recovery further.
A method for microbe oil production, is characterized in that specifically comprising the following steps, but is not limited to following steps:
1, the biosurfactant displacement of reservoir oil
Be 0.05% ~ 0.08% with high pressure pump truck by mass concentration, injection rate is that the biosurfactant of 0.05PV ~ 0.10PV injects oil reservoir from water injection well, and injection rate is 30m
3/ d ~ 50m
3/ d.
2, flooding pattern adjustment
Choose the oil well closing well of 20% ~ 40% of target block oil well sum, the oil well of closing well is selected to be choose from high to low from oil well permeability; The oil well choosing 30% ~ 50% of oil well sum improves Liquid output, and the amplitude that Liquid output improves is original Liquid output 10% ~ 50%, and improving Liquid output oil well selection gist is choose from low to high from oil well permeability.
3, the endogenous microbes displacement of reservoir oil
With high-pressure plunger pump, activator soln is injected oil reservoir from injection well, the injection rate of activator is 0.10PV ~ 0.20PV, and injection rate is 80m
3/ d ~ 120m
3/ d, injection mode is inject continuously, and air Injection amount is 1 × 10
5nm
3~ 2 × 10
5nm
3, air Injection speed is 50Nm
3/ h ~ 100Nm
3/ h.
4, microbial single well stimulation recovers the oil
After endogenous microbes activator injection completes 6 ~ 12 months, the oil well function of injecting bacterium of closing well in step 2 and nutrients is selected to carry out single well stimulation oil recovery.
Wherein, described biosurfactant is the one in rhamnolipid, sophorolipid, lipopeptid, soybean lecithin and algae albumen glycolipid.
The composition of described activator and component glucose 10g/L ~ 15g/L, K
2hPO
43H
2o1g/L ~ 2g/L, Dried Corn Steep Liquor Powder 0.5g/L ~ 0.8g/L, NaCl0.2g/L ~ 0.3g/L.
Described function bacterium is the one in pseudomonad, bacillus subtilis, ground bacillus and acinetobacter calcoaceticus.
Described nutraceutical composition and component are starch 5g/L ~ 8g/L, peptone 1g/L ~ 3g/L, K
2hPO
43H
2o1g/L ~ 2g/L, NaNO
30.2g/L ~ 0.5g/L.
Described function bacterium and nutraceutical injection rate are every rice bran oil layer thickness 5m
3~ 8m
3.
Described function bacterium and nutraceutical injection mode are inject from the oil jacket annular space of oil well.
Described reservoir condition is 30 DEG C of < reservoir temperature < 90 DEG C, reservoir pressure < 15MPa, formation water salinity < 120000mg/L, in-place permeability > 500 × 10
-3μm
2, ground viscosity of crude is lower than 1000mPas.
The present invention first by injecting biosurfactant in oil reservoir, and because biosurfactant has, interfacial tension is low and displacement efficiency is high, therefore, can improve the recovery ratio of water-drive pool further; Simultaneously, flooding pattern is adjusted by the mode of the oil well of closed portion high permeability and the Liquid output of raising part low-permeability oil well, the macropore indirectly plugging oil reservoir reaches the object of water plugging and profile controlling, thus expand the swept volume of endogenous microbes, the comprehensive function of the organic acid produced by endogenous microbes metabolism, biosurfactant and biogas and oil reservoir, and then the recovery ratio improving water-drive pool further; Finally, because injection biosurfactant and activator are in oil reservoir constantly dilution and consumption, actual reach oil deposit deep part especially the activator of adjacent to oil well area and biosurfactant amount seldom or concentration very low, therefore, the remaining oil of oil deposit deep part especially adjacent to oil well area compares enrichment, by the crude oil of the enrichment of microbial single well stimulation process displacement of reservoir oil adjacent to oil well area, well yield can be improved largely; Oil recovery factor and the recovery percent of reserves of water-drive pool can be increased substantially by above aggregate measures.
The present invention compared with prior art tool has the following advantages and beneficial effect:
(1) it is wide, cheap and do not injure the advantage on stratum that the activator that the present invention adopts has source;
(2) oil reservoir of this invention is applied widely, is particularly suitable for the medium to high permeable rate oil reservoir of waterflooding development;
(3) this invention have that technique is simple, specific aim and workable;
(4) field test results is good, and field trial improves recovery ratio and is greater than 15.0%.
Four, detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further, but protection scope of the present invention is not limited in this:
Embodiment 1:
Shengli Oil Field block L is the loose sand oil accumulation of high salinity, medium to high permeable rate, medium-high viscosity, buried depth 1253m ~ 1327m, reservoir temperature 53 DEG C, reservoir pressure 11.2MPa, degree of porosity 32.5%, voids volume 2.8 × 10
4m
3, permeability 1200 × 10
-3μm
2, recoverable reserves 6.9 × 10
4t, formation water salinity is 12350mg/L, oil well sum 10 mouthfuls, and oil well permeability, Liquid output and core intersection statistics is in table 1.
Table 1 block L oil well permeability, Liquid output and core intersection statistical form
| Sequence number | Pound sign | Permeability, 10 -3μm 2 | Daily fluid production rate, m 3 | Core intersection, m |
| 1 | L-1 | 1500 | 98 | 12.5 |
| 2 | L-2 | 1100 | 80 | 9.8 |
| 3 | L-3 | 950 | 72 | 15.6 |
| 4 | L-4 | 1200 | 95 | 13.3 |
| 5 | L-5 | 800 | 65 | 8.3 |
| 6 | L-6 | 1800 | 102 | 5.6 |
| 7 | L-7 | 1300 | 83 | 7.8 |
| 8 | L-8 | 2100 | 115 | 6.5 |
| 9 | L-9 | 750 | 60 | 14.6 |
| 10 | L-10 | 2500 | 120 | 9.2 |
Implementing specific embodiment of the invention step at this block is:
(1) the biosurfactant displacement of reservoir oil
Be 0.05% with high pressure pump truck by mass concentration, injection rate is that the rhamnolipid of 0.05PV injects oil reservoir from water injection well, and injection rate is 30m
3/ d.
(2) flooding pattern adjustment
Choose oil well totally 2 mouthfuls of oil well closing wells of 20% of oil well sum, oil well L-10 and L-8 respectively of closing well; Choose oil well totally 4 mouthfuls of raising Liquid output of 40% of oil well sum, be respectively L-9, L-5, L-3 and L-2 oil well, the amplitude that Liquid output improves is respectively original Liquid output 50%, 40%, 30% and 10%, and the oilwell produced fluid amount improved after Liquid output is respectively 90m
3, 91m
3, 93.6m
3and 88m
3.
(3) the endogenous microbes displacement of reservoir oil
Will by glucose, K with high-pressure plunger pump
2hPO
43H
2the activator soln of O, Dried Corn Steep Liquor Powder and NaCl composition injects oil reservoir, glucose, K from injection well
2hPO
43H
2o, Dried Corn Steep Liquor Powder and NaCl mass concentration are respectively 10g/L, 1.5g/L, 0.8g/L and 0.2g/L, and the injection rate of activator is that 0.20PV adds up to 0.56 × 10
4m
3, injection rate is 80m
3/ d, injection mode is inject continuously, and air Injection amount is 1 × 10
5nm
3, air Injection speed is 50Nm
3/ h.
(4) microbial single well stimulation recovers the oil
Endogenous microbes activator injection completed after 6 months selects L-10 and L-8 oil well function of injecting bacterium and nutrients to carry out single well stimulation oil recovery, and the function bacterium wherein injected is pseudomonad, and nutraceutical composition and component are starch 5g/L, peptone 2g/L, K
2hPO
43H
2o2g/L, NaNO
3pseudomonad and the nutraceutical injection rate of 0.4g/L, L-10 and L-8 oil well are respectively 46m
3and 52m
3, injection mode is inject from the oil jacket annular space of oil well.
Site test results: field trial period of validity, more than 32 months, adds up to increase oil 1.23 × 10
4t, improves oil recovery factor 17.8%.
Embodiment 2:
Shengli Oil Field block M is the water drive sandstone reservoirs of high salinity, high permeability, buried depth 1528m ~ 1672m, reservoir temperature 75 DEG C, reservoir pressure 13.5MPa, degree of porosity 33.2%, voids volume 9.2 × 10
5m
3, permeability 1500 × 10
-3μm
2, recoverable reserves 7.5 × 10
5t, formation water salinity is 14570mg/L, oil well sum 12 mouthfuls, and oil well permeability, Liquid output and core intersection statistics is in table 2.
Table 2 block M oil well permeability, Liquid output and core intersection statistical form
| Sequence number | Pound sign | Permeability, 10 -3μm 2 | Daily fluid production rate, m 3 | Core intersection, m |
| 1 | M-1 | 1300 | 83 | 9.5 |
| 2 | M-2 | 1800 | 98 | 10.3 |
| 3 | M-3 | 2200 | 105 | 12.8 |
| 4 | M-4 | 1500 | 102 | 10.9 |
| 5 | M-5 | 1000 | 75 | 6.2 |
| 6 | M-6 | 1700 | 95 | 8.4 |
| 7 | M-7 | 2500 | 125 | 7.3 |
| 8 | M-8 | 2100 | 108 | 13.7 |
| 9 | M-9 | 850 | 78 | 13.8 |
| 10 | M-10 | 2300 | 122 | 9.9 |
| 11 | M-11 | 700 | 96 | 7.3 |
| 12 | M-12 | 1600 | 86 | 6.5 |
Implementing specific embodiment of the invention step at this block is:
(1) the biosurfactant displacement of reservoir oil
Be 0.08% with high pressure pump truck by mass concentration, injection rate is that the sophorolipid of 0.08PV injects oil reservoir from water injection well, and injection rate is 40m
3/ d.
(2) flooding pattern adjustment
Choose oil well totally 5 mouthfuls of oil well closing wells of 40% of oil well sum, oil well M-7, M-10, M-3, M-8 and M-2 respectively of closing well; Choose oil well totally 6 mouthfuls of raising Liquid output of 50% of oil well sum, be respectively M-11, M-9, M-5, M-1, M-4 and M-12 oil well, the amplitude that Liquid output improves is respectively original Liquid output 50%, 40%, 30%, 25%, 20% and 10%, and the oilwell produced fluid amount improved after Liquid output is respectively 144m
3, 109.2m
3, 97.5m
3, 103.8m
3, 122.4m
3and 94.6m
3.
(3) the endogenous microbes displacement of reservoir oil
Will by glucose, K with high-pressure plunger pump
2hPO
43H
2the activator soln of O, Dried Corn Steep Liquor Powder and NaCl composition injects oil reservoir, glucose, K from injection well
2hPO
43H
2o, Dried Corn Steep Liquor Powder and NaCl mass concentration are respectively 15g/L, 1.0g/L, 0.5g/L and 0.25g/L, and the injection rate of activator is that 0.10PV adds up to 0.92 × 10
5m
3, injection rate is 100m
3/ d, injection mode is inject continuously, and air Injection amount is 1.5 × 10
5nm
3, air Injection speed is 80Nm
3/ h.
(4) microbial single well stimulation recovers the oil
Endogenous microbes activator injection completed after 10 months selects M-7, M-10, M-3, M-8 and M-2 oil well function of injecting bacterium and nutrients to carry out single well stimulation oil recovery, the function bacterium wherein injected is ground bacillus, and nutraceutical composition and component are starch 6g/L, peptone 3g/L, K
2hPO
43H
2o1g/L, NaNO
30.2g/L, M-7, M-10, M-3, M-8 and M-2 oil well ground bacillus and nutraceutical injection rate are respectively 58.4m
3, 59.4m
3, 64m
3, 95.9m
3and 61.8m
3, injection mode is inject from the oil jacket annular space of oil well.
Site test results: field trial period of validity, more than 42 months, adds up to increase oil 1.4 × 10
5t, improves oil recovery factor 18.7%.
Embodiment 3:
Shengli Oil Field block P is the sandstone oil reservoir of medium salinity, high permeability, buried depth 985m ~ 1178m, reservoir temperature 65 DEG C, reservoir pressure 9.0MPa, degree of porosity 34.2%, voids volume 4.5 × 10
5m
3, permeability 1800 × 10
-3μm
2, recoverable reserves 9.6 × 10
4t, formation water salinity is 5630mg/L, and oil well sum 8 mouthfuls, block P oil well permeability, Liquid output and core intersection are in table 3.
Table 3 block P oil well permeability, Liquid output and core intersection statistical form
| Sequence number | Pound sign | Permeability, 10 -3μm 2 | Daily fluid production rate, m 3 | Core intersection, m |
| 1 | P-1 | 3200 | 156 | 12.3 |
| 2 | P-2 | 1900 | 98 | 8.5 |
| 3 | P-3 | 1200 | 82 | 7.6 |
| 4 | P-4 | 1000 | 75 | 13.5 |
| 5 | P-5 | 2500 | 128 | 11.4 |
| 6 | P-6 | 2800 | 135 | 10.5 |
| 7 | P-7 | 1500 | 86 | 8.9 |
| 8 | P-8 | 2100 | 105 | 5.4 |
Implementing specific embodiment of the invention step at this block is:
(1) the biosurfactant displacement of reservoir oil
Be 0.06% with high pressure pump truck by mass concentration, injection rate is that the lipopeptid of 0.10PV injects oil reservoir from water injection well, and injection rate is 50m
3/ d.
(2) flooding pattern adjustment
Choose oil well totally 2 mouthfuls of oil well closing wells of 30% of oil well sum, oil well P-1 and P-6 respectively of closing well; Choose oil well totally 2 mouthfuls of raising Liquid output of 30% of oil well sum, be respectively P-4 and P-3 oil well, the amplitude that Liquid output improves is respectively original Liquid output 50% and 40%, and the oilwell produced fluid amount improved after Liquid output is respectively 112.5m
3and 114.8m
3.
(3) the endogenous microbes displacement of reservoir oil
Will by glucose, K with high-pressure plunger pump
2hPO
43H
2the activator soln of O, Dried Corn Steep Liquor Powder and NaCl composition injects oil reservoir, glucose, K from injection well
2hPO
43H
2o, Dried Corn Steep Liquor Powder and NaC mass concentration are respectively 12g/L, 2.0g/L, 0.6g/L and 0.3g/L, and the injection rate of activator is that 0.15PV adds up to 0.675 × 10
5m
3, injection rate is 120m
3/ d, injection mode is inject continuously, and air Injection amount is 2 × 10
5nm
3, air Injection speed is 100Nm
3/ h.
(4) microbial single well stimulation recovers the oil
Endogenous microbes activator injection completed after 12 months selects P-1 and P-6 oil well function of injecting bacterium and nutrients to carry out single well stimulation oil recovery, the function bacterium wherein injected is bacillus subtilis, and nutraceutical composition and component are starch 8g/L, peptone 1g/L, K
2hPO
43H
2o1.5g/L, NaNO
30.5g/L, P-1 and P-6 oil well bacillus subtilis and nutraceutical injection rate are respectively 61.5m
3and 84m
3, injection mode is inject from the oil jacket annular space of oil well.
Site test results: field trial period of validity was more than 35 months, and accumulative increasing oil 1.56 × 104t, improves oil recovery factor 16.3%.
Claims (8)
1. a method for microbe oil production, is characterized in that, specifically comprises the following steps, but is not limited to following steps:
(1) the biosurfactant displacement of reservoir oil
Be 0.05% ~ 0.08% with high pressure pump truck by mass concentration, injection rate is that the biosurfactant of 0.05PV ~ 0.10PV injects oil reservoir from water injection well, and injection rate is 30m
3/ d ~ 50m
3/ d;
(2) flooding pattern adjustment
Choose the oil well closing well of 20% ~ 40% of target block oil well sum, the oil well of closing well is selected to be choose from high to low from oil well permeability; The oil well choosing 30% ~ 50% of oil well sum improves Liquid output, and the amplitude that Liquid output improves is original Liquid output 10% ~ 50%, and improving Liquid output oil well selection gist is choose from low to high from oil well permeability;
(3) the endogenous microbes displacement of reservoir oil
With high-pressure plunger pump, activator is injected oil reservoir from injection well, the injection rate of activator is 0.10PV ~ 0.20PV, and injection rate is 80m
3/ d ~ 120m
3/ d, injection mode is inject continuously, and air Injection amount is 1 × 10
5nm
3~ 2 × 10
5nm
3, air Injection speed is 50Nm
3/ h ~ 100Nm
3/ h;
(4) microbial single well stimulation recovers the oil
After endogenous microbes activator injection completes 6 ~ 12 months, the oil well function of injecting bacterium of closing well in step (2) and nutrients is selected to carry out single well stimulation oil recovery.
2. the method for microbe oil production according to claim 1, is characterized in that described biosurfactant is the one in rhamnolipid, sophorolipid, lipopeptid, soybean lecithin and algae albumen glycolipid.
3. the method for microbe oil production according to claim 1 and 2, is characterized in that described activator composition and component are glucose 10g/L ~ 15g/L, K
2hPO
43H
2o1g/L ~ 2g/L, Dried Corn Steep Liquor Powder 0.5g/L ~ 0.8g/L, NaCl0.2g/L ~ 0.3g/L.
4. the method for microbe oil production according to claim 1, is characterized in that described function bacterium is the one in pseudomonad, bacillus subtilis, ground bacillus and acinetobacter calcoaceticus.
5. the method for the microbe oil production according to claim 1 or 4, is characterized in that described nutraceutical composition and component are starch 5g/L ~ 8g/L, peptone 1g/L ~ 3g/L, K
2hPO
43H
2o1g/L ~ 2g/L, NaNO
30.2g/L ~ 0.5g/L.
6. the method for microbe oil production according to claim 5, is characterized in that described function bacterium and nutraceutical injection rate are every rice bran oil layer thickness 5m
3~ 8m
3.
7. the method for microbe oil production according to claim 6, its feature is inject from the oil jacket annular space of oil well in described function bacterium and nutraceutical injection mode.
8. the method for microbe oil production according to claim 1, its feature is 30 DEG C of < reservoir temperature < 90 DEG C at described reservoir condition, reservoir pressure < 15MPa, formation water salinity < 120000mg/L, in-place permeability > 500 × 10
-3μm
2, ground viscosity of crude is lower than 1000mPas.
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| CN105781510A (en) * | 2016-02-29 | 2016-07-20 | 烟台智本知识产权运营管理有限公司 | Method for increasing crude oil recovery rate through indigenous microbial drive |
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| CN107558972A (en) * | 2016-07-01 | 2018-01-09 | 中国石油化工股份有限公司 | A kind of method that microbial single well stimulation improves oil well output |
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