CN108930529A - Oil based on discarded oil/gas well-thermo-electrically co-production - Google Patents
Oil based on discarded oil/gas well-thermo-electrically co-production Download PDFInfo
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- CN108930529A CN108930529A CN201811064611.7A CN201811064611A CN108930529A CN 108930529 A CN108930529 A CN 108930529A CN 201811064611 A CN201811064611 A CN 201811064611A CN 108930529 A CN108930529 A CN 108930529A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention discloses a kind of oil based on discarded oil/gas well-thermo-electrically co-productions, air or oxygen is injected into discarded oil/gas well, oxidation reaction occurs for part crude oil, high temperature exothermic, so that discarded oil/gas well Central Plains to exploit the oil gas utilized and is able to exploitation utilization, and the thermal energy of generation is used, for generating electricity or heating, realize oil-thermo-electrically coproduction of discarded oil/gas well.The present invention makes full use of the abandoned well of oil gas field, can increase oil and gas production and recovery ratio under conditions of without new resource exploration, so that discarded oil gas field is come back to life, not only saved crude oil development cost, but also improve the utilization rate of petroleum resources.
Description
Technical field
The present invention relates to a kind of Integrated Energy production techniques using crude oil oxidation reaction, specifically, being related to a kind of base
In oil-thermo-electrically co-production of discarded oil/gas well.
Background technique
Oil and gas industry field status.Now, petroleum resources play the high speed development of human society indispensable
Effect, however more and more people start to worry the sustainability problem of petroleum resources.Largely statistics are shown, the one of oil field
Secondary and secondary development degree can only be between 20% to 35%, and the average recovery ratio in oil field is usually no more than 50%.Therefore have in oil field
A large amount of crude oil, which also remains in underground, to be extracted, and in the oil field that many has been discarded, these are remained in reservoir
Crude oil saturation degree still up to 30%.These crude oil because technical restriction reason and the reason of the economic benefit is not high will not
Earth's surface is mined to be used by the mankind.
In addition, there is also a large amount of obsolete oil/gas wells in oil field.Shown according to statistical data, 2005 it is Chinese it is total effectively
Well is 164076 mouthfuls, and abandoned well is 76881 mouthfuls, currently, the quantity of abandoned well is in the trend of rapid growth.These are idle discarded
Well cannot not only generate economic benefit, it is also possible to the crude oil in reservoir be made to be deep into other stratum through discarded pit shaft and pollute these
Underground fluid resource in stratum.Existing well workover technology includes casing repairing, except sides such as pitch, paraffin removal and recovery well pressures
Method.These workover costs only account for boring 1/10 to the 1/7 of the new well expense of a bite.Therefore, if these abandoned wells pass through well workover skill
Art re-uses, and will greatly save up-front investment cost.
Geothermal Resources.Geothermal energy resources most ancient one of the energy in the world.According to measuring and calculating, the total heat energy of earth interior
Amount, about the 1.7 hundred million of worldwide coal reserves times.100,000,000,000 barrels of stones are equivalent to through earth's surface dispersed heat from earth interior every year
The heat that oil firing generates.Geothermal energy resources are also a kind of most valuable comprehensive mineral resources simultaneously, and function is more, purposes
Extensively, a kind of energy resources of cleaning are not only, for the utilization such as power generation, heating, but also are a kind of for extraction bromine, iodine, boron
The hot brine resource of the raw materials of industry such as sand, sylvite, ammonium salt and natural rich water resource, while still valuable medical thermal mineral water and drink
With mineral water resource and living water water source.Practice have shown that, the comprehensive development and utilization of geothermal energy resources is social, economical for many years
It is very significant with environmental benefit.The Chinese government have shutting mechanism, the departments such as mine and petroleum, coal attach great importance to surveying for geothermal energy resources
It looks into research and development to utilize, i.e. " three is large stretch of " area with western Zang Nan and the western regions of the Yunnan Province, North China and southeastern coast one with formation, make
The key area utilized is researched and developed for national geothermal prospecting, and is mutually tied with the tentative development and utilization demonstration pilot project of typical geothermal field
It closes, achieves great achievement, pushed the development of national exploitation and utilization of geotherm resources.In terms of global tectonics, Central and Western China
Middle low-temperature geothermal resource is distributed in most area.High-temperature geothermal resource pole is distributed in the western regions of the Yunnan Province, Chuan Xi and Zang Nan.In conclusion
Midwest has the geothermal energy resources of different temperatures, salinity and special chemical ingredient.Existing high-temperature steam resource and in cryogenically
Lower hot water, and have light hot water, high mineralization hot brine and thermal mineral water, resource guarantor is provided for the comprehensive development and utilization of geothermal energy resources
Card.With the implementation for the strategic objective that China is shifted to western part, the underground heat work of central and west regions is gradually strengthened, and
Obtain remarkable break-throughs.In geothermal power generation, heating, greenhouse, cultivation, rehabilitation medical, extract industrial chemicals, tourism and bottled mineral
Water etc. has obtained extensive utilization.
For as this seed type geothermal energy resources of hot spring, the mode that heat does not need artificial assistance is brought to earth's surface.And it is right
In basin, type geothermal energy resources need to drill through geothermal well arrival geothermal reservoir then to adopt heat.It again can be in such a way that geothermal well adopts heat
It is divided into: directly extracts underground high temperature fluid to earth's surface；From earth's surface injection fluid to geothermal reservoir, fluid will after geothermal reservoir
Heat is carried to earth's surface；For case type geothermal well, fluid only flows in geothermal well, without influencing geothermal reservoir and stratum
Fluid to carry out " only take heat do not fetch water ".
For the mining method of " heat is only taken not fetch water ", one such implementation, which refers to, seals the borehole wall and shaft bottom
Gu so that not can be carried out fluid communication with country rock and geothermal reservoir in pit shaft.Geothermal well outer layer is generally steel casing, intermediate
Nested one layer of hollow steel pipe again, referred to as extraction well.Produce the annular space position between well and outer layer sleeve in this way as earth's surface injection
The position of fluid, referred to as injection annular space.The effect of extraction well is to produce the fluid of earth's surface injection and be back to earth's surface.Extraction
High temperature fluid for after warming oneself or generating electricity again can again recharge to injecting annular space.Whole process is a closed cyclic system
System.
Some field tests show that the outlet temperature of domestic geothermal well is most of at 100 DEG C or so.Such temperature is not
It is sufficient for large-scale commercial applications power generation to use.If underground crude oil, abandoned well and geothermal energy exploitation sufficiently combine, can not only
The crude oil for solving oil field penetrates into the pollution problem on stratum, moreover it is possible to cannot will directly be exploited to the crude oil of earth's surface and abandoned well and become useless
For treasured, economic benefit is generated.Specific practice are as follows:
After abandoned well is transformed into geothermal well, can extract underground geothermal by geothermal well can and be used, as utilized ground
Thermal energy is for warm power generation.But the temperature of the working medium fluid of common geothermal well extraction is not high enough, deficiency reaches power plant
Inlet temperature requirements and be difficult to generate economic benefit.It in this case, just can be by cannot be direct in subsurface reservoir
The crude oil on extraction ground is used to assist geothermal well heat-collecting system.Concrete principle is: by air injection well directly by oxygen
The property changed gas (such as air) injects reservoir, and oxidizing gas and crude oil is made directly to occur to aoxidize and generate amount of heat in underground,
This process is known as combustion in situ.The amount of heat that combustion in situ generates can be captured by geothermal well and be taken out of to earth's surface.According to
Existing data shows that the reservoir temperature of the combustion in situ of air injection progress light oil, can for heavy crude reservoir up to 400 DEG C
Up to 600 DEG C or more.
It is with the immediate underground heat production technique of this method at present: drills through a bite geothermal well to geothermal reservoirs from earth's surface first
Then layer carries out Completion measures to geothermal well, such as add in underground heat extraction pipe periphery plus insulating layer, between the borehole wall and geothermal well
Cementing sealing is to ensure the stability of geothermal well and country rock.In geothermal well after the completion of drilling through with well completion work, by geothermal well
Working medium fluid (such as water, organic media etc.) injects into well from peripheral annular space.Fluid meeting and borehole wall during injection
And the amount of heat in heat exchange absorption country rock occurs for country rock, then backflows from shaft bottom by producing pipe to earth's surface.It is returning
Due to being with insulating layer protection outside extraction tube wall during stream, so the thermal Finite of loss, the work for being back to earth's surface is situated between
Mass flow body will be the fluid for carrying amount of heat.These fluids can be used for subsequent utilization, be such as directly used in resident heating,
Carry out geothermal power generation etc..
The shortcomings that prior art:
1, the exploration cost of geothermal energy resources and risk are higher.Since the geological condition on stratum is extremely complex, earth object at this stage
The detection means such as reason can't accurately predict orientation and depth information containing abundant geothermal energy resources, it is also difficult to grasp from earth's surface
The geological informations such as the formation lithology occurrence among to geothermal reservoir.
2, the drilling risk of geothermal well is high.During creeping into geothermal well, technological means is almost impossible at this stage is employed
Large-scale monitoring device and means to understand the drilling situation in subsurface formations in real time.The experience of drilling engineer can only generally be passed through
And only drilling data carries out the deduction of stratum condition.
3, the complete well risk of geothermal well is high.It is subsequent if having been completed the position from earth drilling to geothermal reservoir
Total completion time is still it cannot be guaranteed that new geothermal well has and adopts thermal effect well, for example cementing quality difference leads to hole instability pit shaft
The problems such as being extruded.
4, the drilling cost of geothermal well is too high.It is counted and is shown according to European Union's GeoElec project, newly drilled through a bite geothermal well and exist
Expense can account for more than half of up-front investment cost in terms of drilling well.It will lead to serious extension cost of investment payoff period in this way, and
And gross profit is not still high after exploiting certain time limit.
5, conventional geothermal well outlet temperature is not high.Under normal circumstances, if geothermal reservoir is not located at geothermal energy resources extremely
Area abundant, the heat that geothermal well is drawn mostly come from heat provided by entire Sidewall Surrounding Rock geothermal gradient field.And only
It only relies on heat provided by geothermal gradient field and is not sufficient to provide higher outlet temperature.When outlet temperature is not high, work
Making medium fluid cannot be subsequent underground heat technology utilization well, and such as hot power plant needs higher input terminal temperature.
Summary of the invention
The present invention is precisely in order to a kind of oil based on discarded oil/gas well for solving above-mentioned technical problem and designing-thermo-electrically connection
Production method.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of oil based on discarded oil/gas well-thermo-electrically co-production injects empty for discarded oil/gas well into discarded oil/gas well
Gas or oxygen, oxidation reaction, high temperature exothermic occur for part crude oil, so that cannot exploit the original utilized originally in discarded oil/gas well
Oil is able to exploitation and utilizes, and the thermal energy of generation is used, and for generating electricity or heating, realizes oil-thermo-electrically of discarded oil/gas well
Coproduction, the improved producing well of abandoned well are oil-thermo-electrically coproduction well.
Oil based on the discarded oil/gas well-thermo-electrically co-production is injected before gas injection and is carried for highly aqueous gas-bearing formation
There is the aqueous solution for the catalyst that can promote crude oil oxidation reaction.
Oil based on the discarded oil/gas well-thermo-electrically co-production, after injecting air, in later period recovery process alternately
Air and aqueous solution are injected, suitably to reduce the temperature of oil reservoir after oxidation reaction.
Oil based on the discarded oil/gas well-thermo-electrically co-production, catalyst are the high price gold that can promote oxidation reaction
Belong to ion-oxygen compound or nano-sized carbon, generally iron oxide.
Oil based on the discarded oil/gas well-thermo-electrically co-production, aqueous solution be in water be added preservative with prevent it is swollen
Agent, preservative and expansion-resisting agent can be the substance of the same or like performance of sodium chloride.
Oil based on the discarded oil/gas well-thermo-electrically co-production, well are straight well, horizontal well, inclined shaft, multi-lateral well, well
Bottom cavity body, or be individual well, to well, multiple spot well pattern.
Oil based on the discarded oil/gas well-thermo-electrically co-production, the discarded oil/gas well include thoroughly discarded oil
Gas well closes on discarded oil/gas well and low yield oil/gas well.
Oxygen is installed in oil based on the discarded oil/gas well-thermo-electrically co-production, the oil-thermo-electrically coproduction well shaft bottom
Gas content determination sensor or device, for measuring oil-thermo-electrically coproduction well high temperature high-pressure fluid in the oxygen content in shaft bottom；
The control and related production process for injecting air capacity with the determination in relation to parameter are zero for target with its oxygen content, to ensure
It is not oxygenous in the oil pipe of producing well；If the high temperature fluid containing crude oil and natural gas in the oil pipe of producing well contains oxygen,
The safety of production is not can guarantee then.
Oil based on the discarded oil/gas well-thermo-electrically co-production is transformed into using the abandoned well of oil gas field and is suitble to adopt
The geothermal well of heat, technical solution is specifically:
1. carrying out well workover measure to abandoned well, such as the pullover that can more renew after wellhead assembly damage, remove in well due to original
Wax, asphalitine, metal rust, the inorganic mineral salt crust etc. for recovering the oil and generating；
2. air is injected downwardly into oil reservoir by annular space, closing well for a period of time after, crude oil that oil reservoir inner part is contacted with oxygen
The oxidation reaction of generation oxidation reaction, this crude oil and oxygen is exothermic reaction, a large amount of thermal energy is generated in reaction process, simultaneously
Generate multiple gases, such as carbon monoxide, carbon dioxide；Due to the generation of high temperature and multiple gases, height will be generated in oil reservoir
Pressure, the final fluid for generating high temperature and pressure, the crude oil including gas and liquid；
3. air is injected downwardly into oil reservoir by annular space, the time of closing well depends on the property and oil reservoir original temperature of crude oil,
From several days to some months etc., the specific time can be determined using the methods of numerical simulation；Main principle is to ensure that in air
Oxygen can be completely consumed in oil reservoir by oxidation reaction, without oxygen in oil pipe when ensuring high temperature fluid output,
So that it is guaranteed that the safety of oily cogeneration of heat and power process；
4. the high-temperature, high pressure fluid generated after crude oil is reacted with oxygen in oil reservoir enters from oil reservoir is located at packer lower part annular space, envelope
It forces high-temperature, high pressure fluid not enter the annular space positioned at packer top every device but enters oil pipe；High-temperature, high pressure fluid passes through
The upward output of oil pipe is to ground；Thermal energy is given heat exchanger other end by heat exchanger on ground by the high-temperature, high pressure fluid of output
Working medium fluid, the high temperature fluid of output cools down since energy is converted, and fluid after cooling carries out water-oil separating, crude oil
It can sell, water can recycle after the processing such as filtering；
5. working medium fluid temperature after heat exchanger increases, generate electricity subsequently into electricity generation system；After power generation, working media stream
Body flows back to heat exchanger again.
It is transformed into oily cogeneration of heat and power well by the oil/gas well for having discarded oil field, is then joined using the oily thermoelectricity being transformed into
It produces huge entrained by the high temperature fluid and high temperature fluid that well exploits the residual oil discarded in oil reservoir and crude oil oxidation reaction generates
Big thermal energy, these thermal energy can be used to generate electricity and heat.
The beneficial effects of the present invention are:
1. realize individual well while developing various energy resources.After abandoned well is transformed using this technology, can simultaneously oil-producing, produce
Heat and power generation, realize comprehensive mining and the utilization of petroleum resources.
2. not needing drilling new well.It can use the prior art and abandoned well be transformed into oily cogeneration of heat and power well, in this way, just not
Need to bore new well.
3. making full use of existing infrastructure.Due to have passed through the exploration and development stage before abandoned well, so,
Through having built up required road, electric power facility, well site etc., these infrastructure abandoned originally are transformed by abandoned well
It can be reused after oily cogeneration of heat and power well.
4. making full use of the existing exploration and development data in field area.Due to have passed through exploration and development rank before abandoned well
Section, so, required related data are acquired using various methods and apparatus, as oil-gas reservoir geologic information and data,
Rock, characterisitic parameter of fluid etc., these data and data can obtain after abandoned well to be transformed into oily cogeneration of heat and power well
It is effective to utilize.
5. the resource utilization of discarded oil gas.Abandoned well is transformed into oily cogeneration of heat and power well, discarded oil reservoir can be produced
The residual oil that middle script cannot produce, in this way, can increase oil and gas production under conditions of without new resource exploration and adopt
Yield makes discarded oil gas field come back to life, has not only saved crude oil development cost, but also improve the utilization rate of petroleum resources.
6. small investment, quick.Abandoned well is transformed into oily cogeneration of heat and power well, due to not needing drilling new well, can be saved
A large amount of drilling cost.The period that abandoned well is transformed is also shorter, therefore, can quickly generate economic benefit.
Detailed description of the invention
Fig. 1 is that the present invention is based on the oil of discarded oil/gas well-thermo-electrically co-production flow charts.
Fig. 2 is that the present invention is based on the oil of discarded oil/gas well-thermo-electrically co-production individual well straight well schematic diagrames.
Fig. 3 is that the present invention is based on the oil of the discarded oil/gas well with bottom water-thermo-electrically co-production individual well straight well schematic diagrames.
Fig. 4 is that the present invention is based on the oil of discarded oil/gas well-thermo-electrically co-production individual well horizontal well schematic diagrames.
Fig. 5 is that the present invention is based on the oil of discarded oil/gas well-thermo-electrically co-productions to well straight well schematic diagram.
Fig. 6 is that the present invention is based on the oil of discarded oil/gas well-thermo-electrically co-productions to well water horizontal well schematic diagram.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
A kind of oil based on discarded oil/gas well-thermo-electrically co-production of the present invention, for discarded oil/gas well, toward discarded oil gas
Air or oxygen is injected in well, oxidation reaction, high temperature exothermic, so that cannot open in discarded oil/gas well originally occur for part crude oil
It adopts the crude oil utilized and is able to exploitation utilization, and the thermal energy of generation is used, for generating electricity or heating, realize discarded oil/gas well
Oil-thermo-electrically coproduction, the improved producing well of abandoned well be oil-thermo-electrically coproduction well.
Oil based on the discarded oil/gas well-thermo-electrically co-production is injected before gas injection and is carried for highly aqueous gas-bearing formation
There is the aqueous solution for the catalyst that can promote crude oil oxidation reaction.
Oil based on the discarded oil/gas well-thermo-electrically co-production, after injecting air, in later period recovery process alternately
Air and aqueous solution are injected, suitably to reduce the temperature of oil reservoir after oxidation reaction.
Oil based on the discarded oil/gas well-thermo-electrically co-production, catalyst are the high price gold that can promote oxidation reaction
Belong to ion-oxygen compound or nano-sized carbon, generally iron oxide.
Oil based on the discarded oil/gas well-thermo-electrically co-production, aqueous solution be in water be added preservative with prevent it is swollen
Agent, preservative and expansion-resisting agent can be the substance of the same or like performance of sodium chloride.
Oil based on the discarded oil/gas well-thermo-electrically co-production, as shown in the picture, well can be straight well (Fig. 2, figure
3 and Fig. 5), inclined shaft, horizontal well (Fig. 4 and Fig. 6), multi-lateral well, shaft bottom cavity, or for individual well (Fig. 2, Fig. 3 and Fig. 4), to well (Fig. 5
And Fig. 6), multiple spot well pattern.
Oil based on the discarded oil/gas well-thermo-electrically co-production, the discarded oil/gas well include thoroughly discarded oil
Gas well closes on discarded oil/gas well and low yield oil/gas well.
Oxygen is installed in oil based on the discarded oil/gas well-thermo-electrically co-production, the oil-thermo-electrically coproduction well shaft bottom
Gas content determination sensor or device, for measuring oil-thermo-electrically coproduction well high temperature high-pressure fluid in the oxygen content in shaft bottom；
The control and related production process for injecting air capacity with the determination in relation to parameter are zero for target with its oxygen content, to ensure
It is not oxygenous in the oil pipe of producing well；If the high temperature fluid containing crude oil and natural gas in the oil pipe of producing well contains oxygen,
The safety of production is not can guarantee then.
Oil based on the discarded oil/gas well-thermo-electrically co-production is transformed into using the abandoned well of oil gas field and is suitble to adopt
The geothermal well of heat, technical solution is specifically:
1. carrying out well workover measure to abandoned well, such as the pullover that can more renew after wellhead assembly damage, remove in well due to original
Wax, asphalitine, metal rust, the inorganic mineral salt crust etc. for recovering the oil and generating；
2. air is injected downwardly into oil reservoir by annular space, closing well for a period of time after, crude oil that oil reservoir inner part is contacted with oxygen
The oxidation reaction of generation oxidation reaction, this crude oil and oxygen is exothermic reaction, a large amount of thermal energy is generated in reaction process, simultaneously
Generate multiple gases, such as carbon monoxide, carbon dioxide；Due to the generation of high temperature and multiple gases, height will be generated in oil reservoir
Pressure, the final fluid for generating high temperature and pressure, the crude oil including gas and liquid；
3. air is injected downwardly into oil reservoir 5 by annular space, the time of closing well depends on the property and oil reservoir original temperature of crude oil,
From several days to some months etc., the specific time can be determined using the methods of numerical simulation；Main principle is to ensure that in air
Oxygen can be completely consumed in oil reservoir by oxidation reaction, without oxygen in oil pipe 1 when ensuring high temperature fluid output,
So that it is guaranteed that the safety of oily cogeneration of heat and power process；
4. the high-temperature, high pressure fluid generated after crude oil is reacted with oxygen in oil reservoir enters from oil reservoir is located at packer lower part annular space, envelope
It forces high-temperature, high pressure fluid not enter the annular space positioned at packer top every device but enters oil pipe；High-temperature, high pressure fluid passes through
The upward output of oil pipe is to ground；Thermal energy is given heat exchanger other end by heat exchanger on ground by the high-temperature, high pressure fluid of output
Working medium fluid, the high temperature fluid of output cools down since energy is converted, and fluid after cooling carries out water-oil separating, crude oil
It can sell, water can recycle after the processing such as filtering；
5. working medium fluid temperature after heat exchanger increases, generate electricity subsequently into electricity generation system；After power generation, working media stream
Body flows back to heat exchanger again.
Embodiment 1
As shown in Figure 1, a kind of oil based on discarded oil/gas well-thermo-electrically co-production of the present invention, past useless for discarded oil/gas well
It abandons in oil/gas well and injects air, oxidation reaction, high temperature exothermic, so that cannot exploit in discarded oil/gas well originally utilized occurs
Crude oil is able to exploitation and utilizes, and the thermal resource of generation is used, and for generating electricity and/or heating, realizes discarded oil/gas well
Oil-thermo-electrically coproduction.
For highly aqueous gas-bearing formation, injection carries the water-soluble of the catalyst that can promote crude oil oxidation reaction before gas injection
Liquid.
After injection air, air and aqueous solution are alternately injected in later period recovery process, suitably to reduce oxidation reaction
The temperature of oil reservoir afterwards.
Catalyst is the high volence metal ion oxide or nano-sized carbon that can promote oxidation reaction, generally iron oxide.
Aqueous solution is that preservative and expansion-resisting agent are added in water, and preservative and expansion-resisting agent can be that sodium chloride is same or class
Like the substance of performance.
As shown in the picture, well can for straight well (Fig. 2, Fig. 3 and Fig. 5), inclined shaft, horizontal well (Fig. 4 and Fig. 6), multi-lateral well,
Shaft bottom cavity, or be individual well (Fig. 2, Fig. 3 and Fig. 4), to well (Fig. 5 and Fig. 6), multiple spot well pattern.
Discarded oil/gas well includes thoroughly discarded oil/gas well, closes on discarded oil/gas well and low yield oil/gas well.
Its detailed process are as follows:
1. the abandoned well in oil field is transformed into oily cogeneration of heat and power well after can implementing different well workover measures according to discarded degree.Such as
The wellhead assembly that can more renew after wellhead assembly damage, removes wax, the asphalitine, gold generated in well due to originally recovering the oil
Belong to rust, inorganic mineral salt crust etc..
2. air is injected downwardly into oil reservoir by annular space, closing well for a period of time after, what oil reservoir inner part was contacted with oxygen
The oxidation reaction of crude oil generation oxidation reaction, this crude oil and oxygen is exothermic reaction, and a large amount of thermal energy is generated in reaction process,
Multiple gases, such as carbon monoxide, carbon dioxide are generated simultaneously.Due to the generation of high temperature and multiple gases, will be produced in oil reservoir
Raw high pressure, the final fluid for generating high temperature and pressure, the crude oil including gas and liquid.
3. air is injected downwardly into oil reservoir by annular space, the time of closing well is original depending on the property and oil reservoir of crude oil
Temperature, from several days to some months etc., specific time can be determined using the methods of numerical simulation.Main principle is to ensure that air
In oxygen can be completely consumed in oil reservoir by oxidation reaction, without oxygen in oil pipe when ensuring high temperature fluid output
Gas, so that it is guaranteed that the safety of oily cogeneration of heat and power process.
4. the high-temperature, high pressure fluid generated after crude oil is reacted with oxygen in oil reservoir enters from oil reservoir and is located at packer lower loop
Sky, packer force high-temperature, high pressure fluid not enter the annular space positioned at packer top but enter oil pipe.High temperature and high pressure flow
Body is by the upward output of oil pipe to ground.It is another that thermal energy on ground by heat exchanger is given heat exchanger by the high-temperature, high pressure fluid of output
The working medium fluid (water, oil or other fluids) of outer one end, the high temperature fluid of output are cooled down since energy is converted, cooling
Fluid afterwards carries out water-oil separating, and crude oil can be sold, and water can be used for after the processing such as filtering with water and re-injection.
5. working medium fluid temperature after heat exchanger increases, generate electricity subsequently into electricity generation system.After power generation, work
For medium fluid by working medium pump pumped back heat exchanger after condenser condenses, this is a closed-cycle system.
Embodiment 2
As shown in Figure 2, Figure 3 and Figure 4, in Fig. 2,2-1 is oil pipe, and 2-2 is annular space, and 2-3 is casing, and 2-4 is stratum, and 2-5 is oil
Layer or gas-bearing formation, 2-6 are well completion cement, and 2-7 is packer, and 2-8 is air, and 2-9 is high temperature fluid, and 2-10 is heat exchanger, 2-11
For working media, 2-12 is electricity generation system, and 2-13 is gas-liquid separator, and 2-14 is condenser, and 2-15 is working medium pump.
In Fig. 3,3-1 is bottom water, and 3-2 is partition, and 3-3 is packer, and 3-4 is oil water boundary, and 3-5 is oil reservoir or gas
Layer.
In Fig. 4,4-1 is oil reservoir or gas-bearing formation.
For the oil-gas Layer with bottom water, the oil based on discarded oil/gas well-thermo-electrically coproduction detailed process are as follows:
1. implementing different well workover measures according to abandoned well of the different hole conditions to oil field, abandoned well is transformed into oily thermoelectricity and is joined
Produce well.
2. setting up partition of the radius at 2 meters or more with cement near water to oil area, it is therefore an objective to prevent injection
Pressure-air is broken through from the water to oil area near casing too early enters pit shaft, and keeps the air of injection as much as possible and crude oil
Contact.
3. air is injected downwardly into oil reservoir by annular space, closing well for a period of time after, what oil reservoir inner part was contacted with oxygen
The oxidation reaction of crude oil generation oxidation reaction, this crude oil and oxygen is exothermic reaction, and a large amount of thermal energy is generated in reaction process,
Multiple gases, such as carbon monoxide, carbon dioxide are generated simultaneously.Due to the generation of high temperature and multiple gases, will be produced in oil reservoir
Raw high pressure, the final fluid for generating high temperature and pressure, the crude oil including gas and liquid.
4. air is injected downwardly into oil reservoir by annular space, the time of closing well is original depending on the property and oil reservoir of crude oil
Temperature, from several days to some months etc., specific time can be determined using the methods of numerical simulation.Main principle is to ensure that air
In oxygen can be completely consumed in oil reservoir by oxidation reaction, without oxygen in oil pipe when ensuring high temperature fluid output
Gas, so that it is guaranteed that the safety of oily cogeneration of heat and power process.
5. the high-temperature, high pressure fluid generated after crude oil is reacted with oxygen in oil reservoir enters water layer from oil reservoir around partition, so
Afterwards enter packer lower part annular space, packer force high-temperature, high pressure fluid will not enter positioned at packer top annular space but into
Enter oil pipe.High-temperature, high pressure fluid is by the upward output of oil pipe to ground.The high-temperature, high pressure fluid of output passes through heat exchanger on ground
Thermal energy is given the other end of working medium fluid of heat exchanger (water, oil or other fluids), the high temperature fluid of output due to
Energy is converted and is cooled down, and fluid after cooling carries out water-oil separating, and crude oil can be sold, and water can be used after the processing such as filtering
In with water and re-injection.
6. the temperature after heat exchanger of working medium fluid 11 increases, generate electricity subsequently into electricity generation system.After power generation, work
Make medium fluid after condenser condenses by working medium pump pumped back heat exchanger, this is a closed-cycle system.
Embodiment 3
As shown in Figure 5 and Figure 6, in Fig. 5,5-1 is injection well, and 5-2 is producing well, and 5-3 is packer.In Fig. 6,6-1 is injection
Well, 6-2 are producing well, and 6-3 is packer.
A kind of oil based on discarded oil/gas well-thermo-electrically co-production of the present invention, can be raw using a bite injection well, a bite
Well is produced, i.e., is produced while realizing oily thermoelectricity to well, this is the controllable degree ratio of the injection process of air to the characteristics of well scheme
Higher, the oxygen in air can be completely consumed in oil reservoir by oxidation reaction, to ensure the pit shaft in producing well, oil pipe
It is interior there is no oxygen, so that it is guaranteed that the safety of oily cogeneration of heat and power process, detailed process are as follows:
1. selecting two mouthfuls of abandoned wells separated by a distance, determines wherein to be flatly air injection well, is in addition flatly high temperature height
Fluid production well is pressed, the spacing distance of two mouthfuls of wells is generally 500 to 1000 meters.
2. implementing different well workover measures, production therein to determining injection well and producing well according to different hole conditions
Outside package thermal insulation material (such as expanded polystyrene material) of oil pipe in well is to reduce scattering and disappearing for heat, in this way, will give up
The producing well of abandoning is transformed into oily cogeneration of heat and power well.
3. the oil pipe by air Jing Guo injection well is injected downwardly into, oil reservoir is entered below packer, is injected into oil reservoir
Air from injection well to during producing well flowing, crude oil that oil reservoir inner part is contacted with oxygen generation oxidation reaction, this
The oxidation reaction of kind crude oil and oxygen is exothermic reaction, a large amount of thermal energy is generated in reaction process, while generating multiple gases, such as
Carbon monoxide, carbon dioxide etc..Due to the generation of high temperature and multiple gases, high pressure will be generated in oil reservoir, finally generates high temperature
The fluid of high pressure, the crude oil including gas and liquid.
4. the high-temperature, high pressure fluid generated after crude oil is reacted with oxygen in oil reservoir is from oil reservoir from the packer in producing well
Lower section enters the upward output of oil pipe to ground.Thermal energy is given heat exchanger by heat exchanger on ground by the high-temperature, high pressure fluid of output
Other end of working medium fluid (water, oil or other fluids), the high temperature fluid of output is cooled down since energy is converted, cold
But the fluid after carries out water-oil separating, and crude oil can be sold, and water can be used for after the processing such as filtering with water and re-injection.
5. working medium fluid temperature after heat exchanger increases, generate electricity subsequently into electricity generation system.After power generation, work
For medium fluid by working medium pump pumped back heat exchanger after condenser condenses, this is a closed-cycle system.
The present invention is not limited to above-mentioned preferred forms, anyone obtain under the inspiration of the present invention it is other it is any with
The identical or similar product of the present invention, is within the scope of the present invention.
Claims (9)
1. a kind of oil based on discarded oil/gas well-thermo-electrically co-production, it is characterised in that: for discarded oil/gas well, toward abandoned oil
Air or oxygen is injected in gas well, oxidation reaction, high temperature exothermic, so that originally cannot in discarded oil/gas well occur for part crude oil
It exploits the crude oil utilized and is able to exploitation utilization, and the thermal energy of generation is used, for generating electricity or heating, realize discarded oil gas
The oil of well-thermo-electrically coproduction, the improved producing well of abandoned well are oil-thermo-electrically coproduction well.
2. the oil based on discarded oil/gas well-thermo-electrically co-production according to claim 1, it is characterised in that: contain for height
Aqueous hydrocarbon layer, injection carries the aqueous solution for the catalyst that can promote crude oil oxidation reaction before gas injection.
3. the oil based on discarded oil/gas well-thermo-electrically co-production according to claim 1, it is characterised in that: injection air
Afterwards, the alternately injection air and aqueous solution in later period recovery process, suitably to reduce the temperature of oil reservoir after oxidation reaction.
4. oil-thermo-electrically co-production according to claim 2 based on discarded oil/gas well, it is characterised in that: catalyst
For the high volence metal ion oxide or nano-sized carbon that can promote oxidation reaction, generally iron oxide.
5. oil-thermo-electrically co-production according to claim 2 and 3 based on discarded oil/gas well, it is characterised in that: water-soluble
Liquid is that preservative and expansion-resisting agent are added in water, and preservative and expansion-resisting agent can be the object of the same or like performance of sodium chloride
Matter.
6. the oil based on discarded oil/gas well-thermo-electrically co-production according to claim 1, it is characterised in that: the well is
Straight well, horizontal well, inclined shaft, multi-lateral well, shaft bottom cavity, or be individual well, to well, multiple spot well pattern.
7. the oil based on discarded oil/gas well-thermo-electrically co-production according to claim 1, it is characterised in that: described discarded
Oil/gas well includes thoroughly discarded oil/gas well, closes on discarded oil/gas well and low yield oil/gas well.
8. the oil based on discarded oil/gas well-thermo-electrically co-production according to claim 1, it is characterised in that: the oil-
The shaft bottom installation oxygen content determination sensor or device of thermo-electrically coproduction well are high for measuring oil-thermo-electrically coproduction well high temperature
Press fluid in the oxygen content in shaft bottom；Inject the control of air capacity and in relation to production process and the determination in relation to parameter with its oxygen
It is target that Gas content, which is zero, not oxygenous in the oil pipe to ensure producing well；If containing crude oil and day in the oil pipe of producing well
The high temperature fluid of right gas contains oxygen, then not can guarantee the safety of production.
9. the oil based on discarded oil/gas well-thermo-electrically co-production according to claim 1, it is characterised in that: utilize oil gas
The abandoned well in field is transformed into the geothermal well for being suitble to adopt heat, and technical solution is specifically:
1. carrying out well workover measure to abandoned well, such as the pullover that can more renew after wellhead assembly damage, remove in well due to original
Wax, asphalitine, metal rust, the inorganic mineral salt crust etc. for recovering the oil and generating；
2. air is injected downwardly into oil reservoir by annular space, closing well for a period of time after, crude oil that oil reservoir inner part is contacted with oxygen
The oxidation reaction of generation oxidation reaction, this crude oil and oxygen is exothermic reaction, a large amount of thermal energy is generated in reaction process, simultaneously
Generate multiple gases, such as carbon monoxide, carbon dioxide；Due to the generation of high temperature and multiple gases, height will be generated in oil reservoir
Pressure, the final fluid for generating high temperature and pressure, the crude oil including gas and liquid；
3. air is injected downwardly into oil reservoir by annular space, the time of closing well depends on the property and oil reservoir original temperature of crude oil,
From several days to some months etc., the specific time can be determined using the methods of numerical simulation；Main principle is to ensure that in air
Oxygen can be completely consumed in oil reservoir by oxidation reaction, without oxygen in oil pipe when ensuring high temperature fluid output,
So that it is guaranteed that the safety of oily cogeneration of heat and power process；
4. the high-temperature, high pressure fluid generated after crude oil is reacted with oxygen in oil reservoir enters from oil reservoir is located at packer lower part annular space, envelope
It forces high-temperature, high pressure fluid not enter the annular space positioned at packer top every device but enters oil pipe；High-temperature, high pressure fluid passes through
Oil pipe (1) upwards output to ground；In addition thermal energy is given heat exchanger by heat exchanger on ground by the high-temperature, high pressure fluid of output
The working medium fluid of one end, the high temperature fluid of output are cooled down since energy is converted, and fluid after cooling carries out water-oil separating,
Crude oil can be sold, and water can recycle after the processing such as filtering；
5. working medium fluid temperature after heat exchanger increases, generate electricity subsequently into electricity generation system；After power generation, working media stream
Body flows back to heat exchanger again, this is a closed-cycle system.
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