CN114427398A - Microbial huff and puff method for side-bottom water heavy oil reservoir horizontal well - Google Patents
Microbial huff and puff method for side-bottom water heavy oil reservoir horizontal well Download PDFInfo
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- CN114427398A CN114427398A CN202010996278.4A CN202010996278A CN114427398A CN 114427398 A CN114427398 A CN 114427398A CN 202010996278 A CN202010996278 A CN 202010996278A CN 114427398 A CN114427398 A CN 114427398A
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Classifications
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
The invention belongs to the technical field of microbial oil production, and particularly relates to a microbial huff and puff method for a horizontal well of a side-bottom water heavy oil reservoir. The method comprises the following steps: (1) and in the flooding section mining stage of the horizontal well, the yield of crude oil in the flooding section is improved by utilizing the action of the hydrocarbon-philic bacteria and the crude oil in the flooding section. (2) And in the water plugging stage of the water flooding section of the horizontal well, the water flooding section is plugged by utilizing the biopolymer generated by the metabolism of the biopolymer producing bacteria. (3) In the non-flooding section mining stage of the horizontal well, the yield of the crude oil in the non-flooding section is improved by utilizing the comprehensive action of the biosurfactant generated by metabolism of the biosurfactant-producing bacteria and the crude oil, the stratum water and the rock in the non-flooding section. According to the invention, different functional microorganisms or activators are selected according to the properties and distribution conditions of crude oil in different intervals of the horizontal well, and orderly exploitation is carried out in stages, so that efficient exploitation of the whole well section of the horizontal well is effectively realized. And increasing oil for more than 500t for a single well, wherein the input-output ratio is more than 1: 15.
Description
Technical Field
The invention belongs to the technical field of microbial oil recovery, relates to a microbial huff-puff method for a side-bottom water heavy oil reservoir, and particularly relates to a microbial huff-puff method for a side-bottom water heavy oil reservoir horizontal well.
Background
Along with the deepening of oil field development, the number of horizontal wells is continuously increased, and the main advantages of horizontal well development edge-bottom water oil deposit are as follows: the 'oil extraction point' can be changed into an 'oil extraction line', and the edge bottom water coning is slowed down; the contact area is increased, the utilization degree of a reservoir can be effectively improved, and the productivity is improved compared with that of a straight well; the production pressure difference of the horizontal well is relatively small, and the edge bottom water is not easy to break through. However, once the horizontal well is flooded, the water plugging process is complex, the existing water plugging process mainly uses the particle type and gel type plugging agents for water plugging, and as the oil field development is continuously deepened, the radius of the bottom water for plugging by the conventional particle type and gel type plugging agents is small, the plugging effect is gradually poor, and the problem of flooding of the bottom water and the heavy oil reservoir is still outstanding.
The microorganism huff and puff technology effectively reduces the viscosity of crude oil, improves the fluidity of the crude oil, controls the bottom water coning and finally realizes the effective exploitation of the whole well section of the horizontal well by orderly combining a plurality of microorganisms and injecting the microorganisms into a target layer.
CN107664020B discloses a method for plugging a horizontal well of a bottom water reservoir, which adopts a two-slug composite plugging mode to realize the plugging of a high permeability zone and reduce the water content of an oil well, thereby improving the recovery ratio of the bottom water reservoir. The invention has the following problems: (1) the chemical water plugging method is not easy to control the dosage of the plugging agent, and the plugging radius is smaller; (2) the patent only relates to a simple horizontal well water plugging method, and does not relate to a horizontal well comprehensive exploitation method for reducing viscosity of crude oil and the like.
CN102071903B discloses a heavy oil buried hill side bottom water reservoir water shutoff agent and a water shutoff method, wherein the water shutoff agent comprises nitrogen, a strong gel plugging agent and a high-temperature resistant sealing agent, and can effectively block and inhibit water invasion of an oil well and improve the production effect of the oil well. The invention has the following problems: (1) the water plugging method provided by the patent is not optimized according to the flooding degree; (2) and a horizontal well matched exploitation method for reducing viscosity of crude oil and the like is not involved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a microbial huff and puff method for a horizontal well with a bottom-edge water heavy oil reservoir, which selects different functional microbes or activators according to the properties and distribution conditions of crude oil in different intervals of the horizontal well and carries out ordered exploitation in stages, thereby effectively realizing the efficient exploitation of the whole well section of the horizontal well; the method has the characteristics of pertinence, strong operability, low investment cost and obvious oil increasing effect.
In order to achieve the aim, the invention provides a microbial huff and puff method for a horizontal well of a bottom-edge water heavy oil reservoir, which comprises the following steps:
(1) horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator or hydrocarbonophile into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
(2) Water plugging stage for water flooding section of horizontal well
After the exploitation stage of the horizontal well water flooded section is completed, injecting an activator for producing biopolymer bacteria or bacteria for producing biopolymer bacteria into the horizontal well water flooded section, and blocking the water flooded section by using the biopolymer produced by the metabolism of the bacteria for producing biopolymer bacteria.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator or biosurfactant-producing bacteria into the non-water flooded section of the horizontal well, and improving the yield of the crude oil of the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by metabolism of the biosurfactant-producing bacteria and the crude oil, formation water and rock of the non-water flooded section.
The invention discloses a microbial huff and puff method for a horizontal well of a side-bottom water heavy oil reservoir, which comprises the steps of firstly, aiming at the characteristics of low abundance and wide distribution of crude oil in a water flooded layer of the horizontal well, selectively injecting a hydrocarbon-philic bacterium activator or hydrocarbon-philic bacterium into the water flooded section of the horizontal well, and actively transporting the hydrocarbon-philic bacterium to a region where residual oil in the water flooded section is distributed by taking the crude oil as a carbon source by utilizing the function of automatically searching the hydrocarbon-philic bacterium, so that the residual oil is ensured to be fully contacted with the residual oil and the crude oil is degraded, thereby reducing the viscosity of the crude oil and improving the yield of the crude oil in the water flooded section; after the crude oil at the water flooded section is fully mined, injecting an activator for producing biopolymer bacteria or bacteria for producing biopolymer bacteria into the water flooded section of the horizontal well, plugging the water flooded section by using the biopolymer produced by the metabolism of the bacteria for producing biopolymer bacteria, wherein the plugging strength is controlled by the injection amount of the activator for producing biopolymer bacteria or the bacteria for producing biopolymer bacteria, the effective plugging of the water flooded section provides a foundation for the subsequent high-efficiency mining stage of the crude oil at the non-water flooded section, and simultaneously, the gravity action of the biopolymer is utilized to make the bottom water fall back and weaken the bottom water coning phenomenon; and finally, aiming at the characteristic that the crude oil in the non-water flooded section is high in abundance and concentrated, injecting a biosurfactant-producing bacterium activating agent or biosurfactant-producing bacterium into the non-water flooded section of the horizontal well, and reducing the oil-water interfacial tension and improving the flowability of the crude oil by utilizing the comprehensive action of the biosurfactant produced by the metabolism of the biosurfactant-producing bacterium and the crude oil, formation water and rocks in the non-water flooded section, so that the yield of the crude oil in the non-water flooded section is improved. The three stages have a sequential order, and the rings are buckled, closely connected and in a layer-by-layer progressive relationship, so that the high-efficiency exploitation of the whole well section of the bottom-edge water heavy oil reservoir horizontal well is realized.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, different functional microorganisms or activators are selected according to the properties and distribution conditions of crude oil in different intervals of the horizontal well, and orderly exploitation is carried out in stages, so that efficient exploitation of the whole well section of the horizontal well is effectively realized;
(2) the method has strong pertinence and operability, the processes at different stages have difference, the injection amount of the functional microorganisms or the activating agents and the well closing time at different stages are different, the injection amount is related to the lengths of a water flooded section and a non-water flooded section, the well closing time is related to the types of the injected functional microorganisms, and scientific basis is provided for determining the injection amount and the well closing time of the test oil well;
(3) the injected functional bacteria and the activator are nontoxic and harmless, do not have any influence on subsequent sewage treatment, and avoid the problem of environmental pollution caused by the injection of a chemical plugging agent;
(4) the invention has the advantages of simple construction process, simple operation, high input-output ratio and good field test effect, the water content of the oil well is reduced by more than 20%, the oil is increased by more than 500t for a single well, and the input-output ratio is more than 1: 15.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
According to the purpose of the invention, the invention provides a microbial huff and puff method for a side-bottom heavy oil reservoir horizontal well, which comprises the following steps:
(1) horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator or hydrocarbonophile into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
(2) Water plugging stage for water flooding section of horizontal well
After the exploitation stage of the horizontal well water flooded section is completed, injecting an activator for producing biopolymer bacteria or bacteria for producing biopolymer bacteria into the horizontal well water flooded section, and blocking the water flooded section by using the biopolymer produced by the metabolism of the bacteria for producing biopolymer bacteria.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator or biosurfactant-producing bacteria into the non-water flooded section of the horizontal well, and improving the yield of the crude oil of the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by metabolism of the biosurfactant-producing bacteria and the crude oil, formation water and rock of the non-water flooded section.
In the invention, the method also comprises the steps of screening the test oil reservoir and evaluating the field test effect.
Preferably, the screening of the test oil reservoir has the following specific screening criteria: the oil reservoir temperature is less than 85 ℃, the stratum water mineralization is less than 50000mg/L, the oil layer thickness is more than 1m, the horizontal well section length is less than 200m, and the water flooded layer length is less than 20 m. Preferably, the calculation of the length of the water flooded layer adopts a well logging method and a well testing method, and the well logging method is preferred.
Preferably, the indexes of the field test effect evaluation are oil increment, validity period and input-output ratio.
Preferably, the process of the horizontal well water flooded section mining stage in the step (1) comprises the following steps: the injection speed of the hydrocarbonophile activator or hydrocarbonophile is 10-20m3The injection amount is 20-30m per meter of length of the water flooded layer3And shut-in time is 5-15 d; more preferably, the injection speed of the activating agent for hydrocarbon-philic bacteria or hydrocarbon-philic bacteria is 12-15m3The injection amount is 20-25m per meter of length of the water flooded layer3And closing the well for 5-10 d.
In the present invention, the formulation of the activating agent for the hydrocarbon-philic bacterium is preferably peptone or sodium nitrate, dipotassium hydrogenphosphate or potassium dihydrogenphosphate, and more preferably peptone and dipotassium hydrogenphosphate.
Preferably, the hydrocarbonophile comprises one or more of the genera Pseudomonas, Acinetobacter, Brevibacillus, and more preferably the genus Acinetobacter.
Preferably, the process of the water plugging stage of the horizontal well water flooding section in the step (2) comprises the following steps: the biopolymer-producing bacterial activator or biopolymerThe injection speed of the material bacteria is 5-15m3The injection amount is 10-20m per meter of length of the water flooded layer3And the shut-in time is 10-30 d; more preferably, the injection speed of the biopolymer-producing bacteria activator or biopolymer-producing bacteria is 5-10m3The injection amount is 10-15m per meter of length of the water flooded layer3And the shut-in time is 20-25 d.
In the present invention, preferably, the formulation of the biopolymer producing bacteria activator is sucrose or molasses, corn steep liquor dry powder or potassium nitrate, diammonium hydrogen phosphate or ammonium dihydrogen phosphate, more preferably sucrose, corn steep liquor dry powder and ammonium dihydrogen phosphate.
Preferably, the biopolymer-producing bacteria comprise one or both of the genera xanthomonas, and more preferably the genus xanthomonas.
In the invention, preferably, after the exploitation stage of the horizontal well water flooded section is completed, the water content of the oil well produced liquid reaches 99%.
Preferably, the process of the horizontal well non-water flooded section mining stage in the step (3) comprises the following steps: the injection speed of biosurfactant-producing bacteria activator or biosurfactant-producing bacteria is 15-25m3The injection amount is 30-80m per meter of length of the non-water flooded layer3And the shut-in time is 10-20 d; more preferably, the injection speed of the biosurfactant-producing bacterium activator or biosurfactant-producing bacterium is 15-20m3The injection amount is 40-50m per meter of length of the non-water flooded layer3And the shut-in time is 10-15 d.
In the present invention, preferably, the biosurfactant-producing bacteria activator is formulated with glucose or starch, ammonium nitrate or sodium nitrate, dipotassium hydrogen phosphate or ammonium dihydrogen phosphate, and more preferably glucose, ammonium nitrate and dipotassium hydrogen phosphate.
Preferably, the biosurfactant-producing bacteria are one or more of Serratia, Geobacillus stearothermophilus, Bacillus pumilus and Rhodococcus, more preferably Rhodococcus ruber.
In the present invention, preferably, the method further comprises the step of evaluating the effect of a field test.
In the present invention, the injection manner of the hydrocarbonophile activator or the hydrocarbonophile in the step (1) is preferably a continuous type or a slug type, and more preferably a slug type.
Preferably, the number of slugs in the manner of slug injection of the said activating agent for hydrocarbon-philic bacteria or hydrocarbon-philic bacteria is two or more, more preferably two.
In the present invention, the manner of injecting the biopolymer-producing bacteria activator or the biopolymer-producing bacteria in step (2) is preferably a continuous manner or a slug manner, and more preferably a continuous manner.
In the present invention, the biosurfactant-producing bacteria activator or biosurfactant-producing bacteria injection mode in the step (3) is preferably a continuous mode or a slug mode, and more preferably a slug mode.
Preferably, the number of the slugs in the biosurfactant-producing bacteria activator or biosurfactant-producing bacteria slug injection mode is two or more, and more preferably three.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
The present invention will be further described with reference to specific examples.
Example 1
Horizontal well A of certain block of Shengli oil field12The buried depth is 1072 m-1250 m, the oil reservoir temperature is 75 ℃, and the oil reservoir infiltration is carried outRate 700 × 10-3μm2The viscosity of crude oil is 1250mPa.s, the water mineralization degree of a stratum is 12300mg/L, the effective thickness is 7.2m, the length of a horizontal well segment is 180m, the length of a water flooded layer is 18m, and the daily liquid production is 125m398.7 percent of water, and 2.0 multiplied by 10 percent of pseudomonas exists in the output liquid through sampling detection3Xanthogen 1.0X 10 per ml3Peripl ml, Serratia 5.0X 103One per ml. The method for increasing the oil content of the oil well comprises the following specific implementation steps:
horizontal well A12The oil reservoir temperature is 75 ℃, and the oil reservoir permeability is 700 multiplied by 10-3μm2The viscosity of crude oil is 1250mPa.s, the formation water mineralization degree is 12300mg/L, the effective thickness is 7.2m, the length of a horizontal well segment is 180m, the length of a water flooded layer is 18m, the screening standard of the invention is met, and the invention can be implemented.
(1) Horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
The Hydrophilus is pseudomonas, and the formulation of the activating agent for the Hydrophilus is 2.5 wt% of peptone and 1.0 wt% of dipotassium hydrogen phosphate.
The process of the exploitation stage of the water flooded section of the horizontal well comprises the following steps: the injection speed of the hydrocarbonophile activator is 10m3The injection amount is 20m per meter of length of the water flooded layer3The injection amount is 360m3And the shut-in time is 5d, the injection mode is a slug type, and the number of slugs is 2.
(2) Water plugging stage for water flooding section of horizontal well
And after the exploitation stage of the horizontal well water flooded section is finished, injecting an activator for producing biopolymer bacteria into the horizontal well water flooded section, and plugging the water flooded section by using the biopolymer produced by the metabolism of the biopolymer bacteria.
The biopolymer producing bacteria are xanthogen bacteria.
The formula of the biopolymer producing bacteria activator comprises 2.3 wt% of sucrose, 0.5 wt% of corn steep liquor dry powder and 0.2 wt% of diammonium hydrogen phosphate.
The process of the water plugging stage of the water flooding section of the horizontal well comprises the following steps: the injection speed of the biopolymer producing bacteria activatorDegree of 5m3The injection amount is 15m per meter of length of a water flooded layer3The injection amount is 270m3The shut-in time is 25d, and the injection mode is continuous.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator into the non-water flooded section of the horizontal well, and improving the yield of the crude oil in the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by the metabolism of the biosurfactant-producing bacterium and the crude oil, formation water and rocks in the non-water flooded section.
The biosurfactant-producing bacterium is Serratia.
The formula of the biosurfactant-producing bacteria activator comprises 3.2 wt% of glucose, 0.8 wt% of ammonium nitrate and 0.2 wt% of dipotassium hydrogen phosphate.
The process of the horizontal well non-water flooded section mining stage comprises the following steps: the injection speed of the biosurfactant bacteria activator is 15m3The injection amount is 30m per meter of length of the non-water flooded layer3The injection amount is 4860m3The shut-in time is 10d, and the injection mode is continuous.
After the three stages are completed, field test effect analysis and evaluation are carried out, and by 6-30 days in 2020, cumulative oil increase of the oil well is 3250t, the minimum water content reaches 75.2%, the maximum water content is reduced by 23.5%, the validity period reaches 30 months, and the input-output ratio reaches 1: 16.2, the field test effect is good, and the invention has particularly wide popularization and application prospects.
Example 2
Horizontal well A of certain block of Shengli oil field15The depth of burial is 1098 m-1185 m, the temperature of the oil reservoir is 72 ℃, and the permeability of the oil reservoir is 950 multiplied by 10-3μm2Crude oil viscosity of 890mPa.s, formation water mineralization of 18500mg/L, effective thickness of 10m, horizontal well section length of 175m, water flooded layer length of 12m, daily liquid production of 100m398.2% water content, and sampling to detect existence of Acinetobacter in the produced liquid by 1.0 × 10%32.0X 10 Xanthomonas per ml3Geobacillus stearothermophilus 1.0X 10/ml2One per ml. The method for increasing the oil in the oil well comprises the following specific implementation steps:
horizontal well A15At a reservoir temperature of 72 ℃ and a reservoir permeability of 950X 10-3μm2The viscosity of crude oil is 890mPa.s, the salinity of stratum water is 18500mg/L, the effective thickness is 10m, the length of a horizontal well section is 175m, and the length of a water flooded layer is 12m, which meets the screening standard of the invention and can be implemented.
(1) Horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
The Hydrophili bacteria is acinetobacter, and the formulation of the Hydrophili bacteria activator is 1.8 wt% of sodium nitrate and 0.8 wt% of potassium dihydrogen phosphate.
The process of the exploitation stage of the water flooded section of the horizontal well comprises the following steps: the injection speed of the hydrocarbonophile activator is 12m3The injection amount is 25m per meter of length of a water flooded layer3The injection amount is 300m3And shut-in time 10d, the injection mode is continuous, and the number of slugs is 2.
(2) Water plugging stage for water flooding section of horizontal well
And after the exploitation stage of the horizontal well water flooded section is finished, injecting an activator for producing biopolymer bacteria into the horizontal well water flooded section, and plugging the water flooded section by using the biopolymer produced by the metabolism of the biopolymer bacteria.
The biopolymer producing bacteria are xanthomonas sp.
The formula of the biopolymer bacteria activator comprises 2.1 wt% of molasses, 0.3 wt% of corn steep liquor dry powder and 0.1 wt% of ammonium dihydrogen phosphate.
The process of the water plugging stage of the water flooding section of the horizontal well comprises the following steps: the injection speed of the biopolymer bacteria activator is 12m3The injection amount is 10m per meter of the length of the water flooded layer3The injection amount is 120m3And the shut-in time is 15d, the injection mode is a slug type, and the number of slugs is 3.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator into the non-water flooded section of the horizontal well, and improving the yield of the crude oil in the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by the metabolism of the biosurfactant-producing bacterium and the crude oil, formation water and rocks in the non-water flooded section.
The biosurfactant-producing bacterium is Geobacillus stearothermophilus.
The formula of the biosurfactant-producing bacteria activator comprises 3.0 wt% of starch, 1.2 wt% of sodium nitrate and 0.3 wt% of ammonium dihydrogen phosphate.
The process of the horizontal well non-water flooded section mining stage comprises the following steps: the injection speed of the biosurfactant bacteria activator is 16m3The injection amount is 50m per meter of length of the non-water flooded layer3Injection quantity is 8150m3And the shut-in time is 12d, the injection mode is a slug type, and the number of slugs is 3.
After the three stages are completed, field test effect analysis and evaluation are carried out, and by 12 months and 30 days in 2019, cumulative oil increase of the oil well is 3852t, the minimum water content reaches 73.0%, the maximum water content is reduced by 25.2%, the effective period reaches 34 months, the input-output ratio reaches 1: 16.8, the field test effect is good, and the invention has particularly wide popularization and application prospects.
Example 3
Horizontal well C for certain block of Shengli oil field10Reservoir temperature 63 deg.C, reservoir permeability 1200X 10-3μm2Crude oil viscosity of 850mPa.s, stratum water mineralization of 21500mg/L, effective thickness of 9.5m, horizontal well section length of 150m, water flooded layer length of 16m, daily liquid production of 120m399.0% water content, and the presence of Bacillus brevis in the obtained liquid by sampling and detecting21.0X 10 of Xanthomonas per ml3Bacillus pumilus 1.0 × 10/ml3One per ml. The method for increasing the oil in the oil well comprises the following specific implementation steps:
horizontal well C10The oil reservoir temperature is 63 ℃, and the oil reservoir permeability is 1200 multiplied by 10-3μm2The viscosity of crude oil is 850mPa.s, the salinity of stratum water is 21500mg/L, the effective thickness is 9.5m, the length of a horizontal well segment is 150m, the length of a water flooded layer is 16m, the screening standard of the method is met, and the method can be implemented.
(1) Horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
The Hydrophilus is Brevibacillus, and the formulation of the activating agent for the Hydrophilus is 2.1 wt% of peptone and 0.6 wt% of dipotassium hydrogen phosphate.
The process of the exploitation stage of the water flooded section of the horizontal well comprises the following steps: the injection speed of the hydrocarbonophile activator is 15m3The injection amount is 22m per meter of length of a water flooded layer3The injection amount is 352m3And shut-in time 12d, the injection mode is a slug type, and the number of slugs is 2.
(2) Water plugging stage for water flooding section of horizontal well
And after the exploitation stage of the horizontal well water flooded section is finished, injecting an activator for producing biopolymer bacteria into the horizontal well water flooded section, and plugging the water flooded section by using the biopolymer produced by the metabolism of the biopolymer bacteria.
The biopolymer producing bacteria are xanthomonas sp.
The formula of the biopolymer producing bacteria activator comprises 1.2 wt% of sucrose, 0.8 wt% of potassium nitrate and 0.3 wt% of diammonium hydrogen phosphate.
The process of the water plugging stage of the water flooding section of the horizontal well comprises the following steps: the injection speed of the biopolymer bacteria activator is 8m3The injection amount is 12m per meter of the length of the water flooded layer3The injection amount is 192m3The shut-in time is 10d, and the injection mode is continuous.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator into the non-water flooded section of the horizontal well, and improving the yield of the crude oil in the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by the metabolism of the biosurfactant-producing bacterium and the crude oil, formation water and rocks in the non-water flooded section.
The biosurfactant-producing bacterium is Bacillus pumilus.
The formulation of the biosurfactant-producing bacteria activator comprises 2.2 wt% of glucose, 0.5 wt% of sodium nitrate and 0.1 wt% of ammonium dihydrogen phosphate.
Process for exploiting non-flooded section of horizontal wellThe method comprises the following steps: the injection speed of the biosurfactant bacteria activator is 18m3The injection amount is 60m per meter of length of the non-water flooded layer3The injection amount is 8040m3And the shut-in time is 18d, the injection mode is a slug type, and the number of slugs is 2.
After the three stages are completed, field test effect analysis and evaluation are carried out, by 6-30 days in 2020, the cumulative oil increase of the oil well is 3780t, the water content reaches 74.3% at least, the maximum oil increase is reduced by 24.7%, the validity period reaches 36 months, and the input-output ratio reaches 1: 17.5, the field test effect is good, and the invention has particularly wide popularization and application prospects.
Example 4
Horizontal well C for certain block of Shengli oil field21The oil reservoir temperature is 78 ℃, and the oil reservoir permeability is 1000 multiplied by 10-3μm2The viscosity of crude oil is 2160mPa.s, the salinity of stratum water is 32560mg/L, the effective thickness is 15m, the length of a horizontal well segment is 120m, the length of a water flooded layer is 10m, and the daily yield is 80m399.5% water content, and 5.0 × 10 acinetobacter in the product liquid by sampling detection3Xanthogen bacteria per ml, 5.0X 1022.0X 10 Rhodococcus ruber/ml2One per ml. The method for increasing the oil in the oil well comprises the following specific implementation steps:
horizontal well C21The oil reservoir temperature is 78 ℃, and the oil reservoir permeability is 1000 multiplied by 10-3μm2The viscosity of crude oil is 2160mPa.s, the formation water mineralization is 32560mg/L, the effective thickness is 15m, the length of a horizontal well segment is 120m, the length of a water flooded layer is 10m, the screening standard of the method is met, and the method can be implemented.
(1) Horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
The Hydrophili bacteria is acinetobacter, and the formulation of the Hydrophili bacteria activator is 1.5 wt% of sodium nitrate and 0.5 wt% of potassium dihydrogen phosphate.
The process of the exploitation stage of the water flooded section of the horizontal well comprises the following steps: the injection speed of the hydrocarbonophile activator is 16m3The injection amount is the length of a water flooded layer per meter28m3The injection amount is 280m3And the well closing time is 8d, the injection mode is a slug type, and the number of slugs is 3.
(2) Water plugging stage for water flooding section of horizontal well
And after the exploitation stage of the horizontal well water flooded section is finished, injecting an activator for producing biopolymer bacteria into the horizontal well water flooded section, and plugging the water flooded section by using the biopolymer produced by the metabolism of the biopolymer bacteria.
The biopolymer producing bacteria are xanthogen bacteria.
The formula of the biopolymer bacteria activator comprises 2.0 wt% of molasses, 0.5 wt% of potassium nitrate and 0.2 wt% of ammonium dihydrogen phosphate.
The process of the water plugging stage of the water flooding section of the horizontal well comprises the following steps: the injection speed of the biopolymer bacteria activator is 10m3The injection amount is 18m per meter of the length of the water flooded layer3The injection amount is 180m3The shut-in time is 20d, and the injection mode is continuous.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator into the non-water flooded section of the horizontal well, and improving the yield of the crude oil in the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by the metabolism of the biosurfactant-producing bacterium and the crude oil, formation water and rocks in the non-water flooded section.
The biosurfactant-producing bacteria is Rhodococcus ruber.
The formulation of the biosurfactant-producing bacteria activator comprises 2.5 wt% of starch, 0.7 wt% of ammonium nitrate and 0.2 wt% of dipotassium hydrogen phosphate.
The process of the horizontal well non-water flooded section mining stage comprises the following steps: the injection speed of the biosurfactant bacteria activator is 20m3The injection amount is 40m per meter of length of the non-water flooded layer3The injection amount is 4400m3The shut-in time 15d is continuous.
After the three stages are completed, field test effect analysis and evaluation are carried out, by 2, 15 days in 2020, the cumulative oil increase of the oil well is 4230t, the minimum water content reaches 71.5 percent, the maximum water content is reduced by 28 percent, the validity period reaches 38 months, and the input-output ratio reaches 1: 17.8, the field test effect is good, and the invention has particularly wide popularization and application prospects.
Example 5
Horizontal well D for certain block of Shengli oil field35The oil reservoir temperature is 80 ℃, and the oil reservoir permeability is 850 multiplied by 10-3μm2Crude oil viscosity 1865mPa.s, stratum water mineralization 17650mg/L, effective thickness 21m, horizontal well section length 175m, water flooded layer length 15m, daily liquid production 150m398.5% water content, 2.0X 10 Bacillus brevis in the output liquid by sampling detection21.0X 10 of Xanthomonas per ml2Each ml, Rhodococcus ruber 1.0X 103One per ml. The method for increasing the oil in the oil well comprises the following specific implementation steps:
horizontal well D35The oil reservoir temperature is 80 ℃, and the oil reservoir permeability is 850 multiplied by 10-3μm2The crude oil viscosity is 1865mPa.s, the formation water mineralization is 17650mg/L, the effective thickness is 21m, the horizontal well section length is 175m, the length of a water flooded layer is 15m, the screening standard of the method is met, and the method can be implemented.
(1) Horizontal well water flooded section mining stage
And (3) injecting a hydrocarbonophile activator into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section.
The formula of the activating agent for the hydrocarbon-philic bacteria is 2.7 wt% of peptone and 0.6 wt% of potassium dihydrogen phosphate.
The process of the exploitation stage of the water flooded section of the horizontal well comprises the following steps: the injection speed of the hydrocarbonophile activator is 20m3The injection amount is 30m per meter of length of a water flooded layer3The injection amount is 450m3And the well closing time is 8d, the injection mode is a continuous mode, and the number of the slugs is 3.
(2) Water plugging stage for water flooding section of horizontal well
And after the exploitation stage of the horizontal well water flooded section is finished, injecting an activator for producing biopolymer bacteria into the horizontal well water flooded section, and plugging the water flooded section by using the biopolymer produced by the metabolism of the biopolymer bacteria.
The biopolymer producing bacteria are xanthomonas sp.
The formula of the biopolymer producing bacteria activator comprises 2.5 wt% of sucrose, 0.6 wt% of potassium nitrate and 0.1 wt% of diammonium hydrogen phosphate.
The process of the water plugging stage of the water flooding section of the horizontal well comprises the following steps: the injection speed of the biopolymer bacteria activator is 15m3The injection amount is 20m per meter of length of the water flooded layer3The injection amount is 300m3The shut-in time is 30d, and the injection mode is continuous.
(3) Horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator into the non-water flooded section of the horizontal well, and improving the yield of the crude oil in the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by the metabolism of the biosurfactant-producing bacterium and the crude oil, formation water and rocks in the non-water flooded section.
The biosurfactant-producing bacteria is Rhodococcus ruber.
The formulation of the biosurfactant-producing bacteria activator comprises 2.0 wt% of glucose, 1.0 wt% of sodium nitrate and 0.3 wt% of ammonium dihydrogen phosphate.
The process of the horizontal well non-water flooded section mining stage comprises the following steps: the injection speed of the biosurfactant bacteria activator is 25m3The injection amount is 80m per meter of length of the non-water flooded layer3The injection amount is 12800m3And the shut-in time is 20d, the injection mode is a slug type, and the number of slugs is 3.
After the three stages are completed, field test effect analysis and evaluation are carried out, and by 5-11 days of 2020, the cumulative oil increase of the oil well is 5360t, the minimum water content reaches 70.1%, the maximum oil increase is reduced by 28.4%, the validity period reaches 45 months, the input-output ratio reaches 1: 19.2, the field test effect is good, and the invention has particularly wide popularization and application prospects.
Claims (19)
1. A microbial huff and puff method for a horizontal well of a bottom-edge water heavy oil reservoir is characterized by comprising the following steps:
(1) horizontal well water flooded section mining stage
Injecting a hydrocarbonophile activator or hydrocarbonophile into the flooding section of the horizontal well, and improving the yield of crude oil in the flooding section by utilizing the action of the hydrocarbonophile and the crude oil in the flooding section;
(2) water plugging stage for water flooding section of horizontal well
After the exploitation stage of the horizontal well water flooded section is finished, injecting an activator of the biopolymer producing bacteria or the biopolymer producing bacteria into the horizontal well water flooded section, and blocking the water flooded section by using the biopolymer produced by the metabolism of the biopolymer producing bacteria;
(3) horizontal well non-flooded section mining stage
And after the water flooded section is blocked, injecting a biosurfactant-producing bacterium activator or biosurfactant-producing bacteria into the non-water flooded section of the horizontal well, and improving the yield of the crude oil of the non-water flooded section by utilizing the comprehensive action of the biosurfactant produced by metabolism of the biosurfactant-producing bacteria and the crude oil, formation water and rock of the non-water flooded section.
2. The microbial throughput method of the bottom water heavy oil reservoir horizontal well according to claim 1, characterized by further comprising screening of test reservoirs and field test effect evaluation.
3. The horizontal well microorganism huff and puff method for the bottom-edge water heavy oil reservoir according to claim 2, characterized in that the screening of the test reservoir has the following specific screening criteria: the oil reservoir temperature is less than 85 ℃, the stratum water mineralization is less than 50000mg/L, the oil layer thickness is more than 1m, the horizontal well section length is less than 200m, and the water flooded layer length is less than 20 m.
4. The microbial throughput method for the horizontal well of the bottom-edge water heavy oil reservoir of claim 2, wherein the indexes of the field test effect evaluation are oil increment, validity period and input-output ratio.
5. The microbial throughput method for the bottom-edge heavy oil reservoir horizontal well according to claim 1, wherein the step (1) of the horizontal well water flooded section mining stage process comprises the following steps: the injection speed of the hydrocarbonophile activator or hydrocarbonophile is 10-20m3H, injection quantity ofInjecting water to the depth of 20-30 m/m3And closing the well for 5-15 d.
6. The microbial stimulation method for the bottom-edge heavy oil reservoir horizontal well according to claim 1 or 5, wherein the formula of the hydrocarbon-philic bacteria activator is peptone or sodium nitrate, dipotassium hydrogen phosphate or potassium dihydrogen phosphate.
7. The microbial stimulation method for the bottom-edge heavy oil reservoir horizontal well according to claim 1 or 5, wherein the hydrocarbon-philic bacteria comprise one or more of pseudomonas, acinetobacter and brevibacillus.
8. The microbial throughput method for the bottom-edge heavy oil reservoir horizontal well according to claim 1, wherein the process of the water plugging stage of the water flooding section of the horizontal well in the step (2) comprises the following steps: the injection speed of the biopolymer-producing bacteria activator or biopolymer-producing bacteria is 5-15m3The injection amount is 10-20m per meter of length of the water flooded layer3And the shut-in time is 10-30 d.
9. The microbial huff and puff method for the horizontal well of the bottom-edge heavy oil reservoir of the claim 1 or 8, wherein the formula of the biopolymer-producing bacteria activator is sucrose or molasses, corn steep liquor dry powder or potassium nitrate, diammonium hydrogen phosphate or ammonium dihydrogen phosphate.
10. The method for horizontal well microorganism stimulation of the bottom water heavy oil reservoir according to claim 1 or 8, wherein the biopolymer producing bacteria comprise one or two of xanthomonas, xanthomonas.
11. The microbial huff and puff method for the bottom-edge heavy oil reservoir horizontal well according to claim 1, wherein the step (3) of the process of the non-flooded section exploitation stage of the horizontal well comprises the following steps: the injection speed of the biosurfactant-producing bacteria activator or biosurfactant-producing bacteria is 15-25m3The injection amount is 30-80m per meter of length of the non-water flooded layer3And the shut-in time is 10-20 d.
12. The method for horizontal well microorganism stimulation of bottom-edge heavy oil reservoirs according to claim 1 or 11, wherein the formulation of the biosurfactant-producing bacteria activator is glucose or starch, ammonium nitrate or sodium nitrate, dipotassium phosphate or ammonium dihydrogen phosphate.
13. The microbial huff-puff method for the horizontal well of the bottom-edge heavy oil reservoir of claim 1, wherein the biosurfactant-producing bacteria is one or more of Serratia, Geobacillus stearothermophilus, Bacillus pumilus and Rhodococcus ruber.
14. The microbial huff-and-puff method for the bottom-edge heavy oil reservoir horizontal well according to claim 1, wherein the injection mode of the hydrocarbonophile activator or the hydrocarbonophile in the step (1) is continuous or segmented.
15. The microbial huff-and-puff method for the horizontal well of the bottom-edge water heavy oil reservoir of claim 14, wherein the number of slugs in the manner of the slug-type injection of the hydrocarbonophile activator or the hydrocarbonophile is two or more.
16. The microbial huff and puff method for the bottom-edge water heavy oil reservoir horizontal well according to claim 1, wherein the injection mode of the biopolymer-producing bacteria activator or the biopolymer-producing bacteria in the step (2) is continuous or segmented.
17. The microbial huff-and-puff method for the bottom-edge heavy oil reservoir horizontal well according to claim 1, wherein the biosurfactant-producing bacteria activator or the biosurfactant-producing bacteria injection mode in the step (3) is a continuous mode or a slug mode.
18. The microbial huff-and-puff method for the bottom-edge heavy oil reservoir horizontal well according to claim 17, wherein the number of slugs in the biosurfactant-producing bacteria activator or biosurfactant-producing bacteria slug injection mode is two or more.
19. The microbial huff and puff method for the horizontal well of the bottom-edge water heavy oil reservoir of the claim 1, wherein the completion of the exploitation stage of the water flooded section of the horizontal well means that the water content of the produced liquid of the oil well reaches 99%.
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