CN103089211A - Microbial enhanced oil recovery method - Google Patents
Microbial enhanced oil recovery method Download PDFInfo
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- CN103089211A CN103089211A CN2011103468486A CN201110346848A CN103089211A CN 103089211 A CN103089211 A CN 103089211A CN 2011103468486 A CN2011103468486 A CN 2011103468486A CN 201110346848 A CN201110346848 A CN 201110346848A CN 103089211 A CN103089211 A CN 103089211A
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Abstract
The invention provides a microbial enhanced oil recovery method. The microbial enhanced oil recovery method includes main steps: injecting a microorganism solution containing oxygen sources into an oiliness rock stratum by using a microorganism injection well, then injecting water into the oiliness rock stratum, and obtaining crude oil from a benefited oil production well. The microbial enhanced oil recovery method is characterized in that, the microorganism solution containing the oxygen sources is injected in slug mode, the microorganism injection well is closed for at least 3 days after the microorganism solution is completely injected, then the water is injected after the well is opened, and the crude oil is obtained in the benefited oil production well. Compared with the prior art, the microbial enhanced oil recovery method has the advantages of enabling activity of microorganisms injected into an oil deposit to reach a higher level, furthest developing properties of the microorganisms and the like, and accordingly oil displacement effects of the microorganisms are improved.
Description
Technical field
The present invention relates to improving one's methods of a kind of microbe oil production.
Background technology
The research of microbe oil production starts from the twenties in 20th century, and its dominant mechanism is to utilize microorganism degrading crude oil in oil reservoir to reduce viscosity of crude, improves the mobility of crude oil; Metabolism biological surfactant, metabolism organic solvent improve displacement efficiency; Grow in oil reservoir, peel off the recovery ratio of the effect raising crude oil such as oil film.The microbe oil production method is specially adapted to the later stage oil recovery in oil field.Due to the great attention that this technical costs is low, applied widely, easy construction causes oil circle.
The factor that mainly the microbial oil displacement effect is exerted an influence in the microbe oil production method comprises: the injection mode of microorganism, nutrients and oxygen replenish and oil reservoir in the microbial fermentation time control etc.At present, also do not see when microorganisms in oilfield is used in microorganism and be injected into the patent report that in the oil reservoir process, microbial solution is carried out the design of structuring slug; USP 5163510 has proposed injection HZOZ, NaCIO3, KClo.4, NaNO.The method of increase oil reservoir oxygen in water concentration, cost is high, palpus increases special dissolving and injection device, palpus guarantee that chemical agent and reservoir fluid compatibility, reservoir rocks adsorb the unfavorable factors such as loss is large to chemical agent but exist.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, propose a kind of microbe oil production method that injects microbial solution in the slug mode, thereby improve the microbial oil displacement effect.
Inventive concept:
After microorganism is injected into oil reservoir, the leading edge of microbial solution can contact formation water or nutrient solution in a large number with rear tail, make and inject the microorganism concn decrease, this has reduced the action effect of microorganism on the one hand, has extended on the other hand the time of microbial fermentation to terminal point.Continuous injected water dilution when even normally being produced by follow-up Injection Well again when microorganism does not obtain abundant fermentating breeding and reaches the concentration limit that plays a role, all the time can not set up the microorganism " field " that it plays effectively, can play displacement of reservoir oil effect, mineral products be used ended in failure.Consider this impact, the present invention proposes to inject in the slug mode method of microbial solution (being obtained through the nutrient solution dilution by microbial fermentation solution), the microbial solution that soon injects carries out reasonably configuration formation slug by different concentration, consumption, by frontal slug, main body slug, rear rear plug syllogic injecting structure, microbial solution is injected in oil reservoir by the microorganism Injection Well successively.Guarantee effectively that with this microbial solution still can maintain reasonably, be enough to make the microbial fermentation growth to reach in the concentration range of displacement of reservoir oil effect after being diluted by formation water.In addition, in order to provide microbial reproduction required sufficient nutrient environment, the structure of microorganism slug also is included in the structure of microbial solution front and back injection nutrient solution slug.
Because the microorganism of injecting in the microbe oil production method is the aerobic and/or facultative bacterium of detesting, sufficient oxygen is to guarantee that it has highly active prerequisite.And the amount of stratum oxygen in water is limited, and the dissolved oxygen of this low content becomes the restricted factor of their fermentation growths.For guaranteeing to satisfy the microorganism be injected in oil reservoir to the demand of oxygen, the breeding and the metabolism that stimulate microorganism, the present invention propose to fill the oxygen replenishing method that adds air when injecting microbial solution.
After microbial solution is injected into oil reservoir, the adjustment period that the microorganism in microbial solution needing first through adaptation, then just growth period can be entered.Therefore, on the one hand for guaranteeing that injecting microorganism adapts to the required time of reservoir media, main is to guarantee that injection microbial growth, breeding reach the time that its concentration range with displacement of reservoir oil effect needs, the present invention proposes after entering microbial solution by the microorganism Injection Well to oil reservoir injection, the method for closing well fermentation.
Technical scheme: microbe oil production method key step of the present invention is as follows:
successively inject nutrient solution to petroliferous bed in the slug mode by the microorganism Injection Well, volumetric concentration is 4%-10%, consumption is frontal slug microbial solution and the air of the 20-30% of total microbial solution volume, volumetric concentration is 2%-6%, is consumption 50 of total microbial solution volume? 70% main body slug microbial solution and air, volumetric concentration is 4 rank 8%, consumption is rear rear plug microbial solution and the air of the 10-20% of total microbial solution volume, closed the microorganism Injection Well at least 3 days, skilful day of preferred 3-, then drive a well and annotate nutrient solution and water, obtain crude oil (microbial fermentation solution concentration is by 100%) at benefited producing well.
Wherein: described nutrient solution contains the nutritional labelings such as the required yeast extract of growth of microorganism, arteries and veins, nitrogen, phosphorus, potassium.For example adopt yeast extract 50-sooppm; Albumen arteries and veins: o-40oppm; NHoCL:100-600ppm; KZ is that 04:50-300pPm can meet the demands.Injecting the nutrient solution consumption before microbial solution is the 1/10-1/5 of total microbial solution volume; The nutrient solution consumption that injects after microbial solution is total microbial solution volume 1/5-1/1;
Described microbial solution is obtained through the nutrient solution dilution by microbial fermentation solution, and total microbial solution consumption is for controlling 1 eight 000-1 8 00 of reservoir pore volume.
The volume ratio of microbial solution and air is 1: 5-foretells 10;
Described microorganism is the aerobic and/or facultative bacterium of detesting.
Advantage of the present invention: compared with prior art have and to make the activity that is injected into the microorganism in oil reservoir reach higher level, bring into play to greatest extent the advantages such as performance of microorganism, thereby improve the microbial oil displacement effect.
Claims (6)
1. microbe oil production method, its key step contains oxygen source microbial solution and then injected water for first being injected to petroliferous bed by the microorganism Injection Well, obtain crude oil by benefited producing well, it is characterized in that, the described oxygen source microbial solution that contains injects in the slug mode, closed the microorganism Injection Well after microbial solution has been annotated at least 3 days, the water filling that then drives a well obtains crude oil at benefited producing well.
2. the method for claim 1, is characterized in that, wherein said microorganism is the aerobic and/or facultative bacterium of detesting.
3. the method for claim 1, is characterized in that, wherein said oxygen source is dissolved oxygen and the air that replenishes in the oil reservoir in microbial solution under normal pressure.
4. the method for claim 1, is characterized in that, the time of wherein closing the microorganism Injection Well is skilful day of 3-.
5. the method for claim 1, is characterized in that, wherein said microbial solution is obtained through the nutrient solution dilution by microbial fermentation solution.
6. any one method as described in claim 1-5, it is characterized in that, described method key step is: successively inject nutrient solution to petroliferous bed in the slug mode by the microorganism Injection Well, volumetric concentration is 4 ten 10%, consumption is frontal slug microbial solution and the air of the 20-30% of total microbial solution volume, volumetric concentration is 2 ten 6%, consumption is main body slug microbial solution and the air of the 50-70% of total microbial solution volume, volumetric concentration is 4%-8%, consumption is rear rear plug microbial solution and the air of the 10-20% of total microbial solution volume, closed microorganism Injection Well 3-skilful day, then drive a well and annotate nutrient solution and water, obtain crude oil (microbial fermentation solution concentration is by 100%) at benefited producing well,
Wherein: described nutrient solution contains yeast extract 50-500PPm, peptone: 0-400PPm, NH4CL:100-600ppm, KZHPO4:50-300ppm: total microbial solution consumption is for controlling the 1/1000-1/100 of reservoir pore volume; Injecting the nutrient solution consumption before microbial solution is the 1/10-1/5 of total microbial solution volume, and the nutrient solution consumption that injects after microbial solution is the 1/5-1/1 of total microbial solution volume; The volume ratio of microbial solution and air is 1: 5-1: 10.
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| CN2011103468486A CN103089211A (en) | 2011-11-07 | 2011-11-07 | Microbial enhanced oil recovery method |
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| CN2011103468486A CN103089211A (en) | 2011-11-07 | 2011-11-07 | Microbial enhanced oil recovery method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626015A (en) * | 2015-07-29 | 2016-06-01 | 中国石油化工股份有限公司 | Method for improving steam stimulation effect of microorganism single well |
| CN106121606B (en) * | 2016-08-18 | 2018-04-10 | 克拉玛依新科澳石油天然气技术股份有限公司 | Keep the method for implanting of microbial activity |
-
2011
- 2011-11-07 CN CN2011103468486A patent/CN103089211A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626015A (en) * | 2015-07-29 | 2016-06-01 | 中国石油化工股份有限公司 | Method for improving steam stimulation effect of microorganism single well |
| CN105626015B (en) * | 2015-07-29 | 2018-07-27 | 中国石油化工股份有限公司 | A method of improving microbial single well stimulation effect |
| CN106121606B (en) * | 2016-08-18 | 2018-04-10 | 克拉玛依新科澳石油天然气技术股份有限公司 | Keep the method for implanting of microbial activity |
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Application publication date: 20130508 |