CN109653719A - A method of fine and close viscous crude fracturing effect is improved using microorganism in situ - Google Patents
A method of fine and close viscous crude fracturing effect is improved using microorganism in situ Download PDFInfo
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- 238000010276 construction Methods 0.000 claims abstract description 8
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- 238000003825 pressing Methods 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 30
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 28
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 14
- 239000010779 crude oil Substances 0.000 claims description 14
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 14
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- AUNGANRZJHBGPY-UHFFFAOYSA-N D-Lyxoflavin Natural products OCC(O)C(O)C(O)CN1C=2C=C(C)C(C)=CC=2N=C2C1=NC(=O)NC2=O AUNGANRZJHBGPY-UHFFFAOYSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- AUNGANRZJHBGPY-SCRDCRAPSA-N Riboflavin Chemical compound OC[C@@H](O)[C@@H](O)[C@@H](O)CN1C=2C=C(C)C(C)=CC=2N=C2C1=NC(=O)NC2=O AUNGANRZJHBGPY-SCRDCRAPSA-N 0.000 claims description 4
- 229930003779 Vitamin B12 Natural products 0.000 claims description 4
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- FDJOLVPMNUYSCM-WZHZPDAFSA-L cobalt(3+);[(2r,3s,4r,5s)-5-(5,6-dimethylbenzimidazol-1-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl] [(2r)-1-[3-[(1r,2r,3r,4z,7s,9z,12s,13s,14z,17s,18s,19r)-2,13,18-tris(2-amino-2-oxoethyl)-7,12,17-tris(3-amino-3-oxopropyl)-3,5,8,8,13,15,18,19-octamethyl-2 Chemical compound [Co+3].N#[C-].N([C@@H]([C@]1(C)[N-]\C([C@H]([C@@]1(CC(N)=O)C)CCC(N)=O)=C(\C)/C1=N/C([C@H]([C@@]1(CC(N)=O)C)CCC(N)=O)=C\C1=N\C([C@H](C1(C)C)CCC(N)=O)=C/1C)[C@@H]2CC(N)=O)=C\1[C@]2(C)CCC(=O)NC[C@@H](C)OP([O-])(=O)O[C@H]1[C@@H](O)[C@@H](N2C3=CC(C)=C(C)C=C3N=C2)O[C@@H]1CO FDJOLVPMNUYSCM-WZHZPDAFSA-L 0.000 claims description 4
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- 241000305071 Enterobacterales Species 0.000 claims description 3
- 241000187644 Mycobacterium vaccae Species 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 241000193403 Clostridium Species 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 claims description 2
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims description 2
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- JZQKKSLKJUAGIC-UHFFFAOYSA-N pindolol Chemical compound CC(C)NCC(O)COC1=CC=CC2=C1C=CN2 JZQKKSLKJUAGIC-UHFFFAOYSA-N 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
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- 239000007789 gas Substances 0.000 description 1
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- 235000008935 nutritious Nutrition 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- C—CHEMISTRY; METALLURGY
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/582—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of bacteria
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The present invention provides a kind of methods for improving fine and close viscous crude fracturing effect using microorganism in situ.This method comprises the following steps: selecting oil reservoir experiment block, the type of sample detection original position microorganism and picks out the microorganism in situ that can reduce viscosity of crude and interfacial tension from the production fluid of Lin Jing；Configure the fracturing fluid that microorganism in situ can be made to grow and breed under ground environment；It waits for being pumped into fracturing fluid in fractured well to fine and close heavy crude reservoir and carries out pressing crack construction and bored well；Drain and production fluid and Optimum Fracturing liquid are returned in the row's of returning production, monitoring.The present invention reduces oil water interfacial tension and viscosity of crude using microorganism in situ, improve viscous crude mobility, in its fracturing fluid ingredient prepared nutrient solution is cheap, source is wide, environment is not injured, easy to operate using method of the invention, experiment effect is good, it is with strong points, it can be improved crude output, recovery ratio averagely improves 14% or more, can be widely applied in fine and close heavy crude reservoir fracturing reform.
Description
Technical field
It is the invention belongs to Microbial Enhanced Oil Recovery field, in particular to a kind of to improve fine and close viscous crude pressure using microorganism in situ
Split the method for effect.
Background technique
Fine and close heavy crude reservoir recoverable reserves is abundant, but since fine and close heavy crude reservoir hole infiltration is lower, it usually needs hydraulic fracturing
Technology forms fracture network, provides flow channel for crude oil, horizontal well fracturing has become the main of compact oil reservoir at present
Recovery method.Fine and close heavy crude reservoir viscosity is larger, even if fracture network is formed by hydraulic fracturing, due to the original of viscosity resistance
The fluid ability of cause, crude oil is also restrained, influences ultimate recovery.
Microbe oil production refers to the comprehensive function by microorganism itself and its metabolite and reservoir fluid, rock, drop
Low oil water interfacial tension improves crude oil fluidity, to realize the purpose for improving crude output.Microbe oil production is in routine
Huge effect is played in oil reservoir, is had a extensive future.But it not yet seeps in lower fine and close heavy crude reservoir and applies in hole.
Summary of the invention
Based on defect of the existing technology, densification is improved using microorganism in situ the purpose of the present invention is to provide a kind of
The method of viscous crude fracturing effect, this method is easy to operate, with strong points, can effectively improve fine and close recovery factor of heavy oil reservoir.
The purpose of the present invention is achieved by the following technical programs:
On the one hand, the present invention provides a kind of method for improving fine and close viscous crude fracturing effect using microorganism in situ, including with
Lower step:
Step 1 selects oil reservoir experiment block, and the type of sample detection original position microorganism is simultaneously from the production fluid of Lin Jing
Pick out the microorganism in situ that can reduce viscosity of crude and interfacial tension；
Step 2 configures the fracturing fluid that microorganism in situ can be made to grow and breed under ground environment；
Step 3, Xiang Zhimi heavy crude reservoir wait for being pumped into fracturing fluid in fractured well and carry out pressing crack construction and bored well；
Drain and production fluid and Optimum Fracturing liquid are returned in step 4, the row's of returning production, monitoring.
In above-mentioned method, it is preferable that in step 1, the oil reservoir for selecting oil reservoir experiment block meets following condition:
It preserves and is covering pressure matrix permeability less than 0.1 × 10-3μm2Tight sand and/or dense carbonate reservoir
In, the oil accumulation formed without extensive long-distance migration (nearly source aggregation), and the relative density of crude oil is in 20 DEG C of items
It is greater than 0.92 under part, underground viscosity is greater than the oil reservoir of 50MPa.s.
In above-mentioned method, it is preferable that in step 1, the sample detection original position microorganism from the production fluid of Lin Jing
Type simultaneously picks out the microorganism in situ that can reduce viscosity of crude and interfacial tension method particularly includes:
The Lin Jing flatly to fractured well is chosen, and the production layer position of the well is identical as target well, samples from production fluid,
It is intact to prevent from polluting, using microbial rapid detection instrument, detect the type of the microorganism contained in fluid；
Reducing crude oil viscosity test and interfacial tension test are carried out to the various microorganisms in situ sampled in production fluid, choose energy
Enough reduce the microorganism of viscosity of crude and interfacial tension, selection standard are as follows: it is required that viscosity of crude can be reduced to by microorganism
10MPas is hereinafter, oil water interfacial tension can reduce 0.1mN/m or less.
In above-mentioned method, it is preferable that selection can reduce viscosity of crude and the microorganism in situ of interfacial tension includes
Aerobic microbiological, anaerobe and aerobic-anaerobic microbe.
In above-mentioned method, it is preferable that the original position microorganism includes clostridium, sulfate reducing bacteria, pole
One of bacterium, enterobacteria, pseudomonas putida, green Agrobacterium, hare corynebacteria, mycobacteria and mycobacterium vaccae or
It is a variety of.These microorganisms can be obtained by identifying species and screening and by culture breeding, can also pass through commercially available acquisition.
In above-mentioned method, it is preferable that the fracturing fluid is the vitamin for being added to 0.3%-0.5% in guanidine gum fracturing fluid
With the fracturing fluid of the microelement of 0.08%-0.1%；
It further include the oxygen that 1mg/L is added into the fracturing fluid when containing aerobic microbiological in the microorganism in situ
Gas.
In above-mentioned method, it is preferable that the formula of the guanidine gum fracturing fluid includes guanidine glue, the 0.1%- of 0.4%-0.5%
0.15% drag reducer, the demulsifier of 0.4%-0.5%, the gel breaker of 0.2%-0.3%, 0.2% row drive agent and surplus
Water.In the formula of the guanidine gum fracturing fluid, drag reducer, demulsifier, gel breaker, row's drive agent etc. are this field conventional additives,
This formula guanidine gum fracturing fluid can be used equally for by commercially available acquisition.Drag reducer rubs for reducing fracturing fluid and pit shaft and stratum
Resistance；Demulsifier is emulsified for preventing fracturing fluid from entering reservoir with crude oil；Gel breaker accelerates fracturing liquid rubber-breaking；Row drives agent and helps
Go out stratum in fracturing fluid recovery (backflow).
In above-mentioned method, it is preferable that the vitamin may include in vitamin B2, vitamin B12 and vitamin beta etc.
One or more combinations.
In above-mentioned method, it is preferable that the microelement may include one of sulphur, nitrogen, phosphorus and potassium etc. or a variety of
Combination.
In above-mentioned method, the fracturing fluid configured not only has the function of conventional fracturing fluid, including prop-carrying capacity is strong, rubs
Hinder low, stability is good and compatibility is good etc., and microorganism in situ can also be promoted to grow and breeding, meet environmental requirement.
In above-mentioned method, it is preferable that the pressing crack construction includes first fracturing reform and refracturing transformation.
In above-mentioned method, it is preferable that the bored well period is 1 day to 4 months.
In above-mentioned method, it is preferable that the specific steps of the step 4 are as follows:
The row's of returning production is carried out after bored well, collects the sample of production fluid, records target well yield increasing degree, prison
Microorganism growth and breeding situation in drain are returned in survey, are further accumulated experience for Optimum Fracturing formula of liquid.
In above-mentioned method, it is preferable that influence of the monitoring fracturing fluid to the growth and breeding of microorganism is needed in strata pressure
It is carried out at a temperature of.
Beneficial effects of the present invention:
The present invention reduces oil water interfacial tension and viscosity of crude using microorganism in situ, improves viscous crude mobility, prepares
Fracturing fluid ingredient in nutrient solution is cheap, source is wide, do not injure environment, it is easy to operate using method of the invention, it is real
It is good to test effect, it is with strong points, it can be improved crude output, oil recovery factor averagely improves 14% or more, can be widely applied to cause
In close heavy crude reservoir fracturing reform, to improve fine and close heavy crude reservoir yield.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment 1
The present embodiment provides a kind of methods for improving fine and close viscous crude fracturing effect using microorganism in situ, including following step
It is rapid:
Step 1 selects oil reservoir experiment block, and the oil reservoir experiment block selected is certain domestic fine and close heavy crude reservoir, reservoir
Depth 2300m-3200m, strata pressure 28MPa, 86 DEG C of formation temperature, porosity 11%, in-place permeability 0.1mD, crude oil is viscous
60mpa.s is spent, carries out simulated experiment after block Lin Jing obtains underground rock core and production fluid；
It is sampled from the production fluid of Lin Jing and the type of microorganism in situ is detected by microbial rapid detection instrument and is chosen
Select the microorganism in situ that can reduce viscosity of crude and interfacial tension；It is required that microorganism can be by viscosity of crude from 60MPa.s
It is reduced to 10MPa.s or less, it is desirable that oil water interfacial tension can be reduced to 0.1mN/m or less from 24mN/m.The present embodiment detection
To microbe species include following several: clostruidium, sulfate reducing bacteria, arthrobacterium, enterobacteria.
Step 2 configures the fracturing fluid that microorganism in situ can be made to grow and breed under ground environment；The present embodiment is matched
The fracturing fluid set is different from conventional guanidine gum fracturing fluid, in addition to conventional guanidine gum fracturing fluid need 0.4% guanidine glue to be added, 0.1% subtract
Resist, 0.5% demulsifier, 0.2% gel breaker, 0.2% row drive agent, are furthermore also added into 0.5% vitamin solution (vitamin
B2, vitamin B12, vitamin beta are added by 1:1:1) and 0.1% trace element solution (including the required nitrogen of microorganism growth,
Phosphorus, potassium element are added by 2:1:1) it is used to that microorganism in situ is helped to grow.
Step 3 simulates pressing crack construction, is pumped into the fracturing fluid of above-mentioned configuration, and bored well；
After the filtering of fracturing liquid rubber-breaking liquid, it is packed into intermediate receptacle, intact underground rock core is saturated crude oil, on stratum
Test original permeability is just being driven using crude oil under the conditions of temperature, is then using termination of pumping after the fracturing fluid reverse displacement 0.3PV of configuration,
Simulate pressure break and bored well 7 days.
Drain and production fluid and Optimum Fracturing liquid are returned in step 4, the row's of returning production, monitoring；
It after bored well, is just being driven using crude oil, is simulating the row's of returning production, stopping experiment after rate to be infiltrated is constant, using same batch
Secondary rock core compares experiment using conventional fracturing fluid, comparing result shows permeability wound under same experimental conditions and step
Evil value reduces 10.5%, improves recovery ratio 16%.
Embodiment 2
The present embodiment provides a kind of methods for improving fine and close viscous crude fracturing effect using microorganism in situ, including following step
It is rapid:
Step 1 selects oil reservoir experiment block, and it is fine and close thick that the oil reservoir experiment block selected, which is certain domestic oil field B block,
Oil reservoir, depth of reservoirs 3200m~4500m, strata pressure 35MPa, 90 DEG C of formation temperature, porosity 10%, in-place permeability
0.05mD, viscosity of crude 55mpa.s carry out simulated experiment after block Lin Jing obtains underground rock core and production fluid；
The Lin Jing flatly to fractured well is chosen, and the production layer position of the well is identical as target well, well spacing 500m, is flowed from production
It is sampled in body, it is intact to prevent pollution-free, to contain in microbial rapid detection instrument detection fluid microbe species.It will production
The various microorganisms in situ of fluid carry out reducing crude oil viscosities test and interfacial tension test, it is desirable that microorganism can by viscosity of crude from
55mpa.s is reduced to 8mpa.s or less, it is desirable that oil water interfacial tension can be reduced to 0.1mN/m from 24mN/m hereinafter, obtaining energy
The microorganism of viscosity of crude and interfacial tension is enough reduced, the microbe species that the present embodiment detects include following several: stench
Pseudomonad, green Agrobacterium, hare corynebacteria, mycobacteria, mycobacterium vaccae.
Step 2 configures the fracturing fluid that microorganism in situ can be made to grow and breed under ground environment；The present embodiment is matched
The fracturing fluid set is different from conventional guanidine gum fracturing fluid, in addition to conventional guanidine gum fracturing fluid need 0.5% guanidine glue to be added, 0.15% subtract
Resist, 0.4% demulsifier, 0.3% gel breaker, 0.2% row drive agent, are furthermore also added into 0.3% vitamin solution (vitamin
B2, vitamin B12, vitamin beta are added by 2:1:1) and 0.08% trace element solution it is (required including microorganism growth
Sulphur, nitrogen, phosphorus, potassium element are added by 1:1:1:1) it is used to that microorganism in situ is helped to grow, due to having detected part aerobic bacteria,
Therefore the oxygen of 1mg/L need to be added.
Step 3, pressing crack construction are pumped into the fracturing fluid of above-mentioned configuration, and bored well；
Fracturing reform construction, and bored well 20 days are carried out containing nutritious fracturing fluid using above-mentioned preparation, to promote
Microorganism can growth and breeding, reduce interfacial tension, improve crude oil fluidity.
Drain and production fluid and Optimum Fracturing liquid are returned in step 4, the row's of returning production, monitoring；
The row's of returning production is carried out after bored well, collects the sample for returning drain and producing liquid, carries out yield data with Lin Jing
Comparison, daily output amplification 14%.
In conclusion the present invention reduces oil water interfacial tension and viscosity of crude using microorganism in situ, viscous crude flowing is improved
Property, the nutrient solution in fracturing fluid ingredient prepared is cheap, source is wide, does not injure environment, is grasped using method of the invention
To make simply, experiment effect is good, and it is with strong points, it can be improved crude output, oil recovery factor averagely improves 15%, can be widely applied
In fine and close heavy crude reservoir fracturing reform, to improve fine and close heavy crude reservoir yield.
Embodiment described above is merely to illustrate technical idea and feature of the invention, in the art its object is to make
Technical staff it will be appreciated that the contents of the present invention and implement accordingly, patent of the invention only cannot be limited with the present embodiment
It encloses, i.e., same changes or modifications made by all disclosed spirit are still fallen in the scope of the patents of the invention.
Claims (10)
1. a kind of method for improving fine and close viscous crude fracturing effect using microorganism in situ, which comprises the following steps:
Step 1 is selected oil reservoir experiment block, the type of sample detection original position microorganism and is selected from the production fluid of Lin Jing
It can reduce the microorganism in situ of viscosity of crude and interfacial tension out；
Step 2 configures the fracturing fluid that microorganism in situ can be made to grow and breed under ground environment；
Step 3, Xiang Zhimi heavy crude reservoir wait for being pumped into fracturing fluid in fractured well and carry out pressing crack construction and bored well；
Drain and production fluid and Optimum Fracturing liquid are returned in step 4, the row's of returning production, monitoring.
2. the method according to claim 1, wherein the oil reservoir for selecting oil reservoir experiment block is full in step 1
The following condition of foot:
It preserves and is covering pressure matrix permeability less than 0.1 × 10-3μm2Tight sand and/or dense carbonate reservoir in, not
The oil accumulation formed by extensive long-distance migration, and the relative density of crude oil is greater than 0.92 at 20 °C, ground
Lower viscosity is greater than the oil reservoir of 50MPa.s.
3. the method according to claim 1, wherein sampling inspection from the production fluid of Lin Jing in step 1
It surveys the type of microorganism in situ and picks out the microorganism in situ that can reduce viscosity of crude and interfacial tension method particularly includes:
The Lin Jing flatly to fractured well is chosen, and the production layer position of the well is identical as target well, samples from production fluid, saved
It is intact to prevent from polluting, using microbial rapid detection instrument, detect the type of the microorganism contained in fluid；
Reducing crude oil viscosity test and interfacial tension test are carried out to the various microorganisms in situ sampled in production fluid, selection can drop
The microorganism of low viscosity of crude and interfacial tension, selection standard are as follows: it is required that viscosity of crude can be reduced to 10MPa by microorganism
S is hereinafter, oil water interfacial tension can reduce 0.1mN/m or less.
4. according to the method described in claim 3, it is characterized by: the original that can reduce viscosity of crude and interfacial tension chosen
Microorganism includes aerobic microbiological, anaerobe and aerobic-anaerobic microbe for position；
Preferably, the microorganism in situ includes clostridium, sulfate reducing bacteria, arthrobacterium, enterobacteria, the false list of stench
One of born of the same parents bacterium, green Agrobacterium, hare corynebacteria, mycobacteria and mycobacterium vaccae are a variety of.
5. according to the method described in claim 1, it is characterized by: the fracturing fluid is to be added to 0.3%- in guanidine gum fracturing fluid
The fracturing fluid of the microelement of 0.5% vitamin and 0.08%-0.1%；
It further include the oxygen that 1mg/L is added into the fracturing fluid when containing aerobic microbiological in the microorganism in situ.
6. according to the method described in claim 5, it is characterized by: the formula of the guanidine gum fracturing fluid includes 0.4%-0.5%
Guanidine glue, the drag reducer of 0.1%-0.15%, the demulsifier of 0.4%-0.5%, the gel breaker of 0.2%-0.3%, 0.2% row
Drive the water of agent and surplus.
7. according to the method described in claim 5, it is characterized by: the vitamin includes vitamin B2, vitamin B12 and dimension
One of raw element β or a variety of combinations.
8. according to the method described in claim 5, it is characterized by: the microelement includes one of sulphur, nitrogen, phosphorus and potassium
Or a variety of combination.
9. according to the method described in claim 1, it is characterized by: the pressing crack construction includes first fracturing reform and repeats to press
Split transformation；
Preferably, the bored well period is 1 day to 4 months.
10. the method according to claim 1, wherein the specific steps of the step 4 are as follows:
The row's of returning production is carried out after bored well, collects the sample of production fluid, records target well yield increasing degree, and monitoring is returned
Microorganism growth and breeding situation, further accumulate experience for Optimum Fracturing formula of liquid in drain；
Preferably, influence of the monitoring fracturing fluid to the growth and breeding of microorganism need strata pressure and at a temperature of carry out.
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