CN110513073B - Sectional type activator injection mode for activating microorganisms in oil reservoir to generate plugging effect - Google Patents
Sectional type activator injection mode for activating microorganisms in oil reservoir to generate plugging effect Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 52
- 239000007924 injection Substances 0.000 title claims abstract description 52
- 230000003213 activating effect Effects 0.000 title claims abstract description 27
- 244000005700 microbiome Species 0.000 title abstract description 20
- 230000000694 effects Effects 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910001868 water Inorganic materials 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 18
- 239000011574 phosphorus Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 239000011573 trace mineral Substances 0.000 claims abstract description 15
- 235000013619 trace mineral Nutrition 0.000 claims abstract description 15
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 claims description 15
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 14
- 230000000813 microbial effect Effects 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 229930195712 glutamate Natural products 0.000 claims description 8
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 229920002261 Corn starch Polymers 0.000 claims description 7
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 7
- 240000008042 Zea mays Species 0.000 claims description 7
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 7
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 7
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 7
- 239000001110 calcium chloride Substances 0.000 claims description 7
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 7
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 7
- 235000005822 corn Nutrition 0.000 claims description 7
- 239000008120 corn starch Substances 0.000 claims description 7
- 235000013922 glutamic acid Nutrition 0.000 claims description 7
- 239000004220 glutamic acid Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 7
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 7
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 7
- 239000001488 sodium phosphate Substances 0.000 claims description 7
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 7
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 7
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 6
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 6
- 239000003223 protective agent Substances 0.000 claims description 3
- 229910000358 iron sulfate Inorganic materials 0.000 claims 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 43
- 239000010779 crude oil Substances 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 6
- 235000015097 nutrients Nutrition 0.000 description 6
- 229940049906 glutamate Drugs 0.000 description 5
- 238000013508 migration Methods 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000237858 Gastropoda Species 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- PXEDJBXQKAGXNJ-QTNFYWBSSA-L disodium L-glutamate Chemical compound [Na+].[Na+].[O-]C(=O)[C@@H](N)CCC([O-])=O PXEDJBXQKAGXNJ-QTNFYWBSSA-L 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000013923 monosodium glutamate Nutrition 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 229940073490 sodium glutamate Drugs 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229940041514 candida albicans extract Drugs 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- 239000012138 yeast extract Substances 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Geochemistry & Mineralogy (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Treatment Of Biological Wastes In General (AREA)
Abstract
The invention discloses an injection mode of a sectional type activator for activating microorganisms in an oil reservoir to generate a plugging effect. The invention provides a sectional type activator injection method, which comprises the following steps: injecting segmented activating agents consisting of the following different activating agents into the target stratum of the oil field in a segmented mode according to the following sequence 1) to 4) to form a main slug: 1) a phosphorus source activator; 2) a nitrogen source activator; 3) contains inorganic salt and trace element activator; 4) a carbon source activator; the invention adopts the step injection of the activating agents with different components, so that all the components in the activating agents can reach the preset target position to form a complete activating agent system, thereby successfully activating the microorganisms with the endogenous functions in the oil reservoir and improving the efficiency of the microorganisms gathering to the plugging part, thereby playing the effective water plugging role and improving the crude oil recovery ratio.
Description
Technical Field
The invention belongs to the technical field of biology, and particularly relates to a sectional type activator injection mode for activating microorganisms in an oil reservoir to generate a plugging effect.
Background
With the continuous exploitation of petroleum, most of domestic oil reservoirs enter the exploitation stage of medium and high water-cut period. At present, the traditional method is to use chemical plugging agent to plug the water invasion area in the oil reservoir, however, the chemical plugging agent is expensive, the effect is unstable, and the injection of chemical substances causes serious environmental pollution risk. The plugging method by utilizing microorganisms has the characteristics of good effect, low cost, environmental protection and the like, and is a water plugging method which is worth popularizing in a large area. Specifically, the microbial plugging is to inject exogenous functional microbes with polysaccharide and biomembrane and nutrient substances thereof into a high-permeability part of an oil reservoir to enable the functional microbes to form the biomembrane and the polysaccharide, so that the porosity of the oil reservoir is reduced, water is blocked, and the recovery ratio of crude oil is improved.
At present, the microorganism plugging technology is not well applied to the oil reservoir with high water content, and the reason is mainly to mix nutrient components in various activators together for injection. Although the operation is convenient, the adsorption, consumption and migration of various nutrient components in the injection process are not considered, so that the function of the nutrient substances in the activator cannot be effectively exerted, and the oil deposit microorganisms are fully activated and effectively exert the water plugging function.
Disclosure of Invention
In order to more effectively realize microbial plugging, the invention provides the following technical scheme:
the invention aims to provide a sectional type activating agent injection method.
The invention provides a sectional type activator injection method, which comprises the following steps: injecting segmented activating agents consisting of the following different activating agents into the target stratum of the oil field in a segmented mode according to the following sequence 1) to 4) to form a main slug:
1) a phosphorus source activator; the phosphorus source activator comprises the following solutes: sodium phosphate and sodium hypophosphite;
2) a nitrogen source activator; the nitrogen source activator comprises the following solutes: glutamate and glutamic acid;
3) contains inorganic salt and trace element activator; the activator containing inorganic salt and trace elements comprises the following solutes: calcium chloride, magnesium sulfate, ferric sulfate, copper sulfate;
4) a carbon source activator; the carbon source activator comprises the following solutes: corn steep liquor and corn starch.
The glutamate is specifically sodium glutamate in the embodiment of the present invention, and the company: product number of Beijing Bylendi Biotechnology Ltd: DE 0045.
In the above method, the various activators further comprise a solvent;
the various activators consist of various solutes and solvents;
the segment activator is composed of the phosphorus source activator, the nitrogen source activator, the inorganic salt and trace element-containing activator, and the carbon source activator.
In the above method, the mass-to-volume ratio of each solute in the various activators in the segmented activator is as follows:
the mass volume percentage content of the sodium phosphate in the sectional activator is 0.5 percent,
the mass volume percentage content of the sodium hypophosphite in the sectional activator is 1 percent;
the mass volume percentage content of the glutamate in the sectional activator is 0.02 percent;
the mass volume percentage content of the glutamic acid in the sectional type activator is 0.01 percent;
the mass volume percentage content of the copper sulfate in the sectional type activator is 0.006%;
the mass volume percentage content of the ferric sulfate in the sectional activator is 0.03%;
the mass volume percentage content of the calcium chloride in the sectional activator is 0.03%;
the mass volume percentage content of the magnesium sulfate in the sectional activator is 0.03%.
The mass volume percentage content of the corn steep liquor powder in the sectional type activator is 0.3 percent;
the mass volume percentage content of the corn starch in the sectional activator is 0.5%.
In the above method, before the injecting the phosphorus source activator, the method further comprises the following steps: and injecting clear water serving as a protective agent into the target stratum of the oil field to form a front-mounted slug.
The parts of each activator in the total volume V of the sectional type activator is calculated according to the comprehensive determination (simulation experiment in a microorganism profile control chamber) of the consumption and migration rule of each activator in the stratum, and in the embodiment of the invention, the parts are as follows: the injection amount of the phosphorus source activator is 0.3 times of the volume of the sectional activator; the injection amount of the nitrogen source activator is 0.2 times of the volume of the sectional activator; the injection amount of the activator containing inorganic salt and trace elements is 0.2 times of the volume of the sectional activator; the injection amount of the carbon source activator is 0.3 times of the volume of the sectional activator.
In the above method, after the carbon source activator is injected, the method further comprises the following steps: and injecting produced liquid as displacement liquid into the target stratum of the oil field to form a displacement slug.
In the method, the oil field is a middle-high water-cut oil field;
and/or the water content of the high-water-cut oil field is more than or equal to 40 percent.
The application of the method for improving the microbial plugging effect in the oil reservoir is also within the protection scope of the invention.
It is another object of the invention to provide a product that enhances the microbial plugging of the interior of an oil reservoir.
The invention provides products comprising the various activators packaged separately in the above-described methods.
The application of sectional activator injection in improving the microorganism plugging effect in the oil reservoir is also the protection scope of the invention;
the sectional activator injection is to inject the phosphorus source activator, the nitrogen source activator, the activator containing inorganic salt and trace elements and the carbon source activator in the method in sequence.
The 3 rd object of the invention is to provide a method for improving the microorganism plugging effect in the oil reservoir.
The method provided by the invention comprises the sectional type activating agent injection method, and the microbial plugging effect in the oil reservoir is improved.
The effect of improving the microbial plugging in the oil reservoir is embodied in reducing the water content of crude oil of the oil reservoir and/or improving the oil production of the oil reservoir.
The invention adopts the step injection of the activating agents with different components, so that all the components in the activating agents can reach the preset target position to form a complete activating agent system, thereby successfully activating the microorganisms with the endogenous functions in the oil reservoir and improving the efficiency of the microorganisms gathering to the plugging part, thereby playing the effective water plugging role and improving the crude oil recovery ratio.
Drawings
FIG. 1 shows that sectional type activator injection obviously reduces water content of an oil field and has obvious oil increasing effect.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The selection criteria for the wells in the following examples (see table 1) were in accordance with the criteria for microbial oil recovery, while selecting a moderately high water reservoir.
TABLE 1
Embodiment 1, a method for injecting a segmented activator in microbial oil recovery
Components of a one-stage or segmented activator
The segmented activator consists of 4 kinds of activators as follows:
a nitrogen source activator comprising the following solutes: 0.02% of glutamate (specifically sodium glutamate, product number: DE0045 of Beijing Bayer Biotechnology Co., Ltd.), 0.01% of glutamic acid, and the balance of water;
a phosphorus source activator comprising the following solutes: 0.5% sodium phosphate (Shanghai Tantake Techno. Co., Ltd.: 01220500), 1% sodium hypophosphite, and the balance water;
a carbon-source activator comprising the following solutes: 0.3% of corn steep liquor (the product number of the military science and Hongkong (Beijing) biotechnology limited company: FA0100), 0.5% of corn starch (the product number of the Bai Ying Chuang biotechnology (Beijing) limited company: S11149), and the balance of water;
contains inorganic salt and trace element activator, which comprises the following solutes: 0.006% of copper sulfate, 0.03% of ferric sulfate, 0.03% of calcium chloride, 0.03% of magnesium sulfate and the balance of water;
the percentage of each component in each activator is the mass volume ratio of each component to the total volume of the sectional activator, and the unit is g/l.
Each of the above activators consists of a respective concentration of solute and solvent water;
second, calculation of injection amount of each activator in segmented activator
The total volume V of the segmented activator was calculated according to the following calculation formula.
The total volume V of the segmented activator is related to the treatment radius, effective thickness and porosity of the reservoir, and the effective thickness of the reservoir has a fixed value for each specific reservoir:
V＝(π/2)*r2*h*φ
v-total volume of activator, m3
r-treatment radius, m, taking 15 meters for a vertical well and 3 meters for a horizontal well;
h-the effective thickness of the reservoir, m,
phi-reservoir porosity,%,
calculating the mass of each component in each activator according to the mass volume percentage content of each component in each activator in the total volume V of the sectional activators; and then, calculating the parts of each activator in the total volume V of the sectional type activators according to the consumption and migration rule of each activator in the stratum (simulation experiment in a microorganism profile control chamber), wherein the parts are as follows:
the injection amount of the phosphorus source activator is 0.3 time of the volume;
the injection amount of the nitrogen source activator is 0.2 time of the volume;
the injection amount of the activating agent containing inorganic salt and trace elements is 0.2 times of the volume;
the amount of the carbon source activator injected was 0.3 times by volume.
Thirdly, segmented injection of the activating agent
The activator is injected into the same formation and the different components are injected into different radial positions of the formation.
The injection process of the activating agent adopts a fixed pipe column, the oil casing such as the activating agent, the protective liquid and the like is injected annularly and idly by ground equipment (tank cars and pump trucks) through an injection pump, and the whole injection is divided into 3 slugs for injection in sequence: a front slug, a main slug, and a displacement slug. The specific injection steps are as follows:
1. and thoroughly hot washing the oil well before construction to completely remove dead oil in the shaft until the well washing is qualified.
2. In order to facilitate construction and compare test effects, the test well is constructed in a mode of not operating, not starting a pump and injecting from a casing.
3. And closing the water injection gate of the water injection well, stopping pumping the production well, and then closing the production gate.
4. And (4) emptying residual pressure in the pipeline, and connecting the pipeline according to the operation rules.
5. And respectively and fully stirring the components in different activators in different liquid preparation tanks to uniformly mix the solutes.
6. And opening a gate of the well mouth and a gate of the liquid distribution tank.
7. The pump is started, the pressure is tested by clear water, the pipeline is not punctured and leak-proof, and the injection pressure is stable and qualified.
8. The injection of the activator was performed according to the following designed injection scheme:
the injection of the activator is divided into three slugs, a front slug, a main slug, and a displacement slug, which are injected in sequence:
1) front-mounted slug
First 30m of implantation3Clear water is used as a protective agent; the main body section plug is protected, and the anti-channeling and main body section plug is protected;
2) main slug
Sequentially injecting activators of different compositions into the formation in stages through injection pipes (note: this depth is the depth of the reservoir, this depth is different each, the target position is determined generally by the reach)
(1) Injecting 0.3 times volume of phosphorus source activator (the volume is comprehensively determined according to the consumption and migration rule of the phosphorus source in the stratum) to reach 0.3 times mileage of the target position;
(2) after staying for 1 hour, injecting a nitrogen source activator with 0.2 times volume to reach 0.2 time mileage of a target position;
(3) injecting 0.2 times of inorganic salt and trace element activator into the sample without staying to reach 0.2 time of mileage of the target position;
(4) then injecting 0.3 times of carbon deposition source activator to reach 0.3 time of mileage of the target position;
parameters of the above-mentioned injection of the activator:
the injection mode is as follows: injecting through the annulus;
injection speed: the injection speed is 20-30m3/h；
Injection pressure: according to the single well working fluid level condition, the pressure is less than 3Mpa in principle, and the maximum pressure is not more than the stratum fracture pressure.
3) Displacing slug
The produced fluid with 0.7 times volume (the produced fluid is water extracted from underground after water flooding) is used as a displacement fluid to displace the activator to the deep part of the stratum to reach a target water-bearing area, so that the endogenous microorganisms of the oil reservoir are effectively activated, the microorganisms are propagated in a large amount in a high permeable zone, and the effect of water plugging can be realized.
Example 2 staged activation of reservoir internal microorganisms with staged activation
2 oil wells of a certain oil field in inner Mongolia belong to common high-water-content heavy oil reservoirs, water injection development is adopted, the high-water-content fingering phenomenon is serious, and specific reservoir information is shown in the following table 2.
TABLE 2
First, each component of the activator
Components of a one-stage or segmented activator
The segmented activator consists of 4 kinds of activators as follows:
a nitrogen source activator comprising the following solutes: 0.02% of glutamate, 0.01% of glutamic acid and the balance of water;
a phosphorus source activator comprising the following solutes: 0.5% of sodium phosphate, 1% of sodium hypophosphite and the balance of water;
a carbon-source activator comprising the following solutes: 0.3 percent of corn steep liquor, 0.5 percent of corn starch and the balance of water;
contains inorganic salt and trace element activator, which comprises the following solutes: 0.006% of copper sulfate, 0.03% of ferric sulfate, 0.03% of calcium chloride, 0.03% of magnesium sulfate and the balance of water;
the percentage of each component in each activator is the mass volume ratio of each component to the total volume of the sectional activator, and the unit is g/l.
Second, calculation of injection amount of each activator in segmented activator
The total volume V of the segmented activator was calculated according to the following calculation formula.
The total volume V of the segmented activator is related to the treatment radius, effective thickness and porosity of the reservoir, and the effective thickness of the reservoir has a fixed value for each specific reservoir:
V＝(π/2)*r2*h*φ
v-total volume of activator, m3
r-treatment radius, m, taking 15 meters for a vertical well and 3 meters for a horizontal well;
h-the effective thickness of the reservoir, m,
phi-reservoir porosity,%,
calculating the mass of each component in each activator according to the mass volume percentage content of each component in each activator in the total volume V of the sectional activators; and then, calculating the parts of each activator in the total volume V of the sectional type activators according to the consumption and migration rule of each activator in the stratum (simulation experiment in a microorganism profile control chamber), wherein the parts are as follows:
the injection amount of the phosphorus source activator is 0.3 time of the volume;
the injection amount of the nitrogen source activator is 0.2 time of the volume;
the injection amount of the activating agent containing inorganic salt and trace elements is 0.2 times of the volume;
the amount of the carbon source activator injected was 0.3 times by volume.
Thirdly, segmented injection of the activating agent
Experimental groups: in accordance with the procedure of example 1.
Control group: the current non-segmented injection is to directly inject all the nutrients of the activating agent into the ground after mixing, and at present, the total length is generally 15m first3Clean water, then injecting 5% molassesAdding proper amount (20-300 mg/L) of yeast extract, citrate, weakly alkaline phosphate, nitrate, low-mineralization degree (30000 mg/L) and low-concentration (1-20 mg/L) of Ca into the nutrient solution2+、Mg2+、Fe2+、Al3+、Cr3+、Co3+And the like (the concrete method is described in the following documents: Lvzhen, Wanglifeng, Junhejie, et al. Fuyu oilfield microbial water shutoff and profile control mine field test [ J]Daqing petroleum geology and development, 2002(5):48-50), and finally, the displacement injection is carried out for 15m3And (4) clear water.
And closing the well for 3 months.
Fourth, detection
After 3 months, the well is opened for oil production according to the method of raw oil water content determination-distillation
(GB/T8929-1988) the national standard method detects the water content of the crude oil (because the water blockage is at the position of thousands of meters underground, direct observation and detection cannot be carried out, and only the water content of the crude oil and the oil increasing effect can be indirectly reflected).
The results are shown in FIG. 1:
experimental groups:
the comprehensive water content of the well 1 is reduced from 98% to 60%, and the daily average oil yield is 2.7 tons. The comprehensive water content of the well 2 is reduced from 98 percent to 75 percent, the daily average oil production is 4.5 tons, and the period average single-well oil production is 903 tons.
Control group: the maximum yield of crude oil of a single well is 647 tons, and the average yield of the oil of the single well is 129.2 tons.
The results show that the injection of the sectional activator enables the microorganisms to fully play a plugging role, the water content is obviously reduced, and the oil increasing effect is obvious.
Claims (5)
1. A method of segmented activator injection for microbial throughput, comprising the steps of: injecting segmented activating agents consisting of the following different activating agents into the target stratum of the oil field in a segmented mode according to the following sequence 1) to 4) to form a main slug:
1) a phosphorus source activator; the phosphorus source activator comprises the following solutes: sodium phosphate and sodium hypophosphite;
2) a nitrogen source activator; the nitrogen source activator comprises the following solutes: glutamate and glutamic acid;
3) contains inorganic salt and trace element activator; the activator containing inorganic salt and trace elements comprises the following solutes: copper sulfate, iron sulfate, calcium chloride, and magnesium sulfate;
4) a carbon source activator; the carbon source activator comprises the following solutes: corn steep liquor and corn starch;
before the phosphorus source activator is injected, the method also comprises the following steps: injecting clear water serving as a protective agent into the target stratum of the oil field to form a front-mounted slug;
after the carbon source activator is injected, the method further comprises the following steps: and injecting produced liquid as displacement liquid into the target stratum of the oil field to form a displacement slug.
2. The method of claim 1, wherein:
the phosphorus source activator consists of sodium phosphate, sodium hypophosphite and water;
the nitrogen source activator consists of glutamate, glutamic acid and water;
the activator containing inorganic salt and trace elements consists of copper sulfate, ferric sulfate, calcium chloride, magnesium sulfate and water;
the carbon source activator consists of corn steep liquor, corn starch and water;
the segment activator is composed of the phosphorus source activator, the nitrogen source activator, the inorganic salt and trace element-containing activator, and the carbon source activator.
3. The method according to claim 1 or 2, characterized in that:
the mass-to-volume ratio of the segmented activator is as follows:
the mass volume percentage content of the sodium phosphate in the sectional activator is 0.5 percent,
the mass volume percentage content of the sodium hypophosphite in the sectional activator is 1 percent;
the mass volume percentage content of the glutamate in the sectional activator is 0.02 percent;
the mass volume percentage content of the glutamic acid in the sectional type activator is 0.01 percent;
the mass volume percentage content of the copper sulfate in the sectional type activator is 0.006%;
the mass volume percentage content of the ferric sulfate in the sectional activator is 0.03%;
the mass volume percentage content of the calcium chloride in the sectional activator is 0.03%;
the mass volume percentage content of the magnesium sulfate in the sectional activator is 0.03 percent;
the mass volume percentage content of the corn steep liquor in the sectional type activator is 0.3 percent;
the mass volume percentage content of the corn starch in the sectional activator is 0.5%.
4. The method according to claim 1 or 2, characterized in that: the oil field is a middle and high water-cut oil field, and the water content of the middle and high water-cut oil field is more than or equal to 40%.
5. Use of the method of any one of claims 1 to 4 to improve microbial plugging within an oil reservoir.
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