CN102359365A - Oil extraction method for injecting high-temperature steam into oil layer to initiate hydrothermal exothermic reaction - Google Patents
Oil extraction method for injecting high-temperature steam into oil layer to initiate hydrothermal exothermic reaction Download PDFInfo
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- CN102359365A CN102359365A CN2011102619845A CN201110261984A CN102359365A CN 102359365 A CN102359365 A CN 102359365A CN 2011102619845 A CN2011102619845 A CN 2011102619845A CN 201110261984 A CN201110261984 A CN 201110261984A CN 102359365 A CN102359365 A CN 102359365A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 76
- 238000000605 extraction Methods 0.000 title description 3
- 239000007924 injection Substances 0.000 claims abstract description 61
- 238000002347 injection Methods 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 30
- 230000000977 initiatory effect Effects 0.000 claims abstract description 19
- 239000012153 distilled water Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 22
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 claims description 14
- 230000003203 everyday effect Effects 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 239000003921 oil Substances 0.000 abstract description 177
- 239000010779 crude oil Substances 0.000 abstract description 44
- 238000011084 recovery Methods 0.000 abstract description 13
- 238000002485 combustion reaction Methods 0.000 description 21
- 238000011065 in-situ storage Methods 0.000 description 19
- 238000006073 displacement reaction Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000010795 Steam Flooding Methods 0.000 description 6
- 238000010793 Steam injection (oil industry) Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005485 electric heating Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000004821 distillation Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000005984 hydrogenation reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
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- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
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Abstract
A method of oil recovery by injecting high temperature steam into an oil reservoir to initiate a hydrothermal exothermic reaction, the method comprising: injecting high-temperature steam into an oil layer through an injection well of an oil field to initiate a hydrothermal exothermic reaction, and generating a high-temperature front; the temperature of the high-temperature steam is higher than the critical temperature for initiating the hydrothermal exothermic reaction; and when the high-temperature steam is determined to be injected into the oil reservoir for a preset time range, continuously injecting a preset amount of saturated steam or water into the oil reservoir through the injection well, and maintaining the expansion of the high-temperature front. According to the method, high-temperature steam is injected into an oil layer to initiate a hydrothermal exothermic reaction, then saturated steam is injected, or water is directly injected to maintain the expansion of a high-temperature front edge, so that the efficiency of driving crude oil can be improved, and the quality of the crude oil is improved through the hydrothermal exothermic reaction.
Description
Technical field
The present invention relates to oil recovery technique field, oil field, particularly a kind of oil production method that high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal.
Background technology
Existing oil production method mainly comprises: air injection combustion in situ or low-temperature oxidation mode heat oil reservoir, perhaps steam injection method heating oil reservoir, and the displacement crude stream is to producing well.The combustion in situ method is to inject air to get into oil reservoir, is lowered to electric heater in the down-hole, the air that heating is injected; Make burning crude oil in the oil reservoir; After treating that oil reservoir blazes up, stop heating, continue to inject air; Keeping in the oil reservoir burning and producing heat, thereby making the technology of the gas-powered that the crude distillation gasification is injected into.What the method for steam injection was injected is saturated vapour, heats oil reservoir through saturated vapour.Saturated vapour is meant in the steam to also have water to exist, its temperature and pressure correlation, and high-temperature is high more more (under atmospheric pressure is 100 ℃ for steam pressure; Temperature is about 250 ℃ when 4 MPa pressure); The heat crude oil of the saturated vapour that this method utilization is injected makes it viscosity to be reduced, and drives crude oil to producing well, because saturated vapour can not cause the hydro-thermal exothermic reaction; Therefore can not in oil reservoir, produce new heat; Need constantly provide steam to come heating in crude oil, required quantity of steam be very big, and oil displacement efficiency is low.
Can know that through above-mentioned analysis there is very big defective in the method for prior art: the cost that air injection is burnt crude oil is very high, and gas injection rate is limited to be difficult to reach requirement, is very easy to form channelling simultaneously; Annotate the problem that quantity of steam is big, oil displacement efficiency is low that the existence of saturated vapour method needs.
Summary of the invention
The embodiment of the invention provides a kind of high-temperature steam is injected the method that oil reservoir causes the hydro-thermal exothermic reaction; Cause the hydro-thermal exothermic reaction through high-temperature steam being injected oil reservoir, inject saturated vapour then, perhaps directly water filling; Keep the expansion of high temperature leading edge; Can improve the efficient that drives crude oil, and improve the quality of crude oil, solve required air of prior art or the problem that quantity of steam is big and oil recovery efficiency is low through the hydro-thermal exothermic reaction.
To achieve these goals; The embodiment of the invention provides a kind of high-temperature steam is injected the oil production method that oil reservoir causes the hydro-thermal exothermic reaction; Said method comprises: the injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam, produces the high temperature leading edge; The temperature of said high-temperature steam is higher than the critical-temperature that causes said hydro-thermal exothermic reaction; When definite high-temperature steam injects oil reservoir and reaches the Preset Time scope, inject the saturated vapour or the water of scheduled volume through said injection well continuously to oil reservoir, keep the expansion of said high temperature leading edge.
Said injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam and comprises: inject distilled water separately at said injection well; The distilled water that the electric heater heating of the downhole equipment through said injection well is injected is said high-temperature steam, said high-temperature steam is injected oil reservoir cause the hydro-thermal exothermic reaction.
Said injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam and also comprises: inject air at said injection well; The air that the electric heater heating of the downhole equipment through said injection well is injected; High temperature air between forming 400 ℃ to 600 ℃ gets into oil reservoir; Make the oil reservoir burning, after the oil reservoir burning, continue to inject air and keep burning; Treating that burning kept between 10 days to 10 years and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part, causes the hydro-thermal exothermic reaction.
Said injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam and also comprises: in oil reservoir, inject viscosity at the viscous crude of 500 to 5000 milli handkerchiefs between second, well-flushing then through said injection well; Inject air, the air that the electric heater heating of the downhole equipment through said injection well is injected, the high temperature air between forming 400 ℃ to 600 ℃ gets into the oil reservoir that oil reservoir heats nearly well, makes the oil reservoir burning, and continuation injection air is kept burning after the oil reservoir burning; Treating that burning kept between 10 days to 100 days and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part, causes the hydro-thermal exothermic reaction.
Said Preset Time scope is between 1 day to 100 days; The saturated vapour of said scheduled volume is 20-2000 ton every day; The water of said scheduled volume is 1-2000 ton every day.
The beneficial effect of the embodiment of the invention is; The embodiment of the invention is come displacement crude oil through the hydro-thermal exothermic reaction; The hydro-thermal exothermic reaction is that complicated series reaction such as desulfurization, denitrogenation, hydrogenation, open loop and water-gas shift take place for high-temperature water vapor and crude oil; This reaction produces a large amount of heat, generates a large amount of hydrocarbon gas, hydrogen, carbon dioxide and carbon monoxide, and crude oil is carried out upgrading.Because it is huge to give birth to heat, in case initiation reaction, as long as continue to provide water vapour, exothermic reaction promptly can continue, and in oil reservoir, forms the constantly high temperature leading edge of expansion.Its high temperature leading-edge radius of experiment proof enlarges 0.8 meter every day at least, and this is very large speed.Drive the distillation of inswept zone owing to high temperature in leading edge, most of component can become gaseous state in the crude oil, thereby is driven away, and the oil reservoir oil displacement efficiency is very high.The quantity of steam of this reaction needed is less than conventional steam flooding, but oil displacement efficiency is higher than steam flooding far away.Compare with combustion in situ, after burning area expands to a certain degree, inject air capacity and be difficult to meet the demands, still, the injection water vapour is kept the expansion of high temperature leading edge and is not had difficulties.Therefore have very high economic benefit, recovery ratio and rate of oil production.
Description of drawings
Fig. 1 is the method overall flow figure of the embodiment of the invention;
Fig. 2 is injection well and the producing well plane of arrangement sketch map that recovers the oil and construct;
Fig. 3 is the sketch map of shaft bottom firing equipment.
The specific embodiment
The embodiment of the invention provides a kind of high-temperature steam is injected the method that oil reservoir causes the hydro-thermal exothermic reaction; This method is injected oil reservoir with high-temperature water vapor and is caused the hydro-thermal exothermic reaction, in oil reservoir, produces a large amount of heat, injects saturated vapour then; Perhaps directly water filling; Keep the expansion of high temperature leading edge, thereby realize the oil recovery purpose, this is a kind of oil production method that improves the recovery ratio and the development effectiveness of oil reservoir.The high temperature leading edge is meant that the constantly living heat of hydro-thermal exothermic reaction makes the high-temperature region volume increasing, and this high-temperature area is expanded formed edge.
Heat is huge because the hydro-thermal exothermic reaction is given birth to, in case initiation reaction, as long as continue to provide water vapour, exothermic reaction promptly can continue, and in oil reservoir, forms the constantly high temperature leading edge of expansion.Its high temperature leading-edge radius of experiment proof enlarges 0.8 meter every day at least, and this is very large speed.Drive the distillation of inswept zone owing to high temperature in leading edge, most of component can become gaseous state in the crude oil, thereby is driven away, and oil displacement efficiency is very high.
Compare with prior art, the quantity of steam that hydro-thermal exothermic reaction of the present invention needs is less than the conventional steam flooding of prior art, but oil displacement efficiency is higher than conventional steam flooding far away.The combustion in situ mode of prior art; After burning area expands to a certain degree, inject air capacity and be difficult to meet the demands, still; Injection water vapour of the present invention is kept the expansion of high temperature leading edge and is not had difficulties, and therefore has very high economic benefit, recovery ratio and rate of oil production.Simultaneously, the hydro-thermal exothermic reaction generates a large amount of hydrocarbon gas, hydrogen, carbon dioxide and carbon monoxide, and hydrogen and crude oil can improve quality to the crude oil upgrading after forming hydrogenation reaction, and makes useful component such as gasoline, diesel oil increase in the crude oil.
A kind of implementation method of the embodiment of the invention is the distilled water that injects to be heated obtain high-temperature steam.Particularly: go into electric heater in the injection down-hole, inject suitable quantity of water simultaneously, generation can cause the hydro-thermal exothermic reaction in steam injection stratum more than 530 ℃ in the shaft bottom.530 ℃ is the critical-temperature of the initiation hydro-thermal exothermic reaction that records in test.High-temperature steam just needs when causing the hydro-thermal exothermic reaction, in case the hydro-thermal exothermic reaction is initiated, the heat of its generation is enough to make saturated vapour and water to become high-temperature steam, therefore, in case after causing the hydro-thermal exothermic reaction, heater has just quit work.After causing the hydro-thermal exothermic reaction, inject saturated vapour, the expansion of high temperature leading edge is kept in perhaps directly water filling.
The another kind of implementation method of the embodiment of the invention is to inject saturated vapour behind the combustion in situ to obtain high-temperature steam.This method can cause the hydro-thermal exothermic reaction equally, but to different crude oil and stratum, the temperature of combustion in situ is different, therefore will treat with a certain discrimination.Can after burning a period of time, annotate saturated vapour again for confirming the combustion in situ temperature greater than 530 ℃ (measuring) by thermometer.And possibly be lower than 530 ℃ oil reservoir for burning temperature, before igniting, in oil reservoir, inject some thicker crude oil, then igniting; After confirming that burning is normal; Annotate saturated vapour immediately, this moment, the temperature in oil reservoir internal combustion district was higher than 530 ℃ certainly, can cause the hydro-thermal exothermic reaction.Be lowered to electric heater in the down-hole during like the igniting of aforementioned combustion in situ, the air of oil reservoir is injected in heating, according to the crude oil result of experiment; After the temperature of injecting oil reservoir reaches a certain value; Such as 450 ℃, crude oil will blaze up, and the temperature of burning can reach more than 600 ℃.Just can judge according to the temperature that gets into the oil reservoir air whether burning is normal during through igniting.
The concrete technical scheme that the present invention adopts is: the oil recovery block has the well of injection and producing well on every side in the oil field; Inject well and be connected with the equipment that injects saturated vapour and inject light water and distilled water; Perhaps inject well and be connected with the equipment that injects saturated vapour and inject common water and air; Perhaps inject well and be connected with the equipment that injects saturated vapour, crude oil and inject common water and air; Inject well and be connected with the distilled water that electric heating equipment can inject the stratum in the shaft bottom heating, or the air on stratum is injected in heating.Producing well is connected with oil production equipment.
At first, inject high-temperature steam and get into oil reservoir.The method of injecting high-temperature steam has following three kinds:
Distilled water injects from oil pipe in method 1, elder generation, and shut with packer in the casing tube space, simultaneously at the downhole equipment electric heater; The distilled water that heating is injected; More than 530 ℃, is principle not burn electric heater through thermometer control vapor (steam) temperature, and temperature is high more good more.High-temperature steam gets into the oil reservoir that oil reservoir heats nearly well.
Air injects in method 2, elder generation; At the downhole equipment electric heater, heat the air that injects simultaneously, the high temperature air of controlling between forming 400 ℃ to 600 ℃ through thermometer gets into the oil reservoir that oil reservoir heats nearly well; Make the oil reservoir burning; After oil reservoir burning, continue to inject air and keep burning, treat that burning kept steam in jection between 10 days to 10 years, the high-temperature steam in the high temperature oil reservoir of steam after burning between 400 ℃ to 600 ℃ of the formation is expanded to oil deposit deep part.The time of combustion in situ overseas crude oil is relevant with the characteristic of oil reservoir, can obtain the effect of good extraction crude oil at some oil field combustion in situ, and the time can continue longer, and is bad in the effect of some oil reservoir combustion in situ, just changes the hydro-thermal mode over to early and recovers the oil.
Viscosity is injected at the viscous crude of 500 to 5000 milli handkerchiefs between second by method 3, elder generation in oil reservoir; Well-flushing injects air then then, simultaneously at the downhole equipment electric heater; The air that heating is injected; High temperature air between forming 400 ℃ to 600 ℃ gets into the oil reservoir that oil reservoir heats nearly well, makes the oil reservoir burning, after the oil reservoir burning, continues to inject air and keeps burning; Treating that burning kept between 10 days to 100 days and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part.
Then, between definite high-temperature steam injection oil reservoir 1 day to 100 days, utilize the said equipment to inject saturated vapour or water (this moment, heater quit work) continuously to oil reservoir through injecting well.The steam injection amount is 20-2000 ton every day, water injection rate 1-2000 every day ton.
Fig. 1 is the method overall flow figure of the embodiment of the invention, and as shown in Figure 1, this method comprises:
S101, the injection well through the oil field inject oil reservoir with high-temperature steam and cause the hydro-thermal exothermic reaction, produce the high temperature leading edge; The temperature of said high-temperature steam is higher than the critical-temperature that causes said hydro-thermal exothermic reaction;
S102, when definite high-temperature steam injects oil reservoir and reaches the Preset Time scope, inject the saturated vapour or the water of scheduled volume through said injection well continuously to oil reservoir, keep the expansion of said high temperature leading edge.
Wherein, S101 can comprise: inject separately distilled water at said injection well, the distilled water that the electric heater heating of the downhole equipment through said injection well is injected is said high-temperature steam, said high-temperature steam is injected oil reservoir cause the hydro-thermal exothermic reaction.
Wherein, S101 can also comprise: inject air at said injection well, the air that the electric heater heating of the downhole equipment through said injection well is injected, the high temperature air entering oil reservoir between forming 400 ℃ to 600 ℃; Make the oil reservoir burning, after the oil reservoir burning, continue to inject air and keep burning; Treating that burning kept between 10 days to 10 years and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part, causes the hydro-thermal exothermic reaction.
Wherein, S101 can also comprise: in oil reservoir, inject viscosity at the viscous crude of 500 to 5000 milli handkerchiefs between second, back well-flushing then through said injection well; Inject air, the air that the electric heater heating of the downhole equipment through said injection well is injected, the high temperature air between forming 400 ℃ to 600 ℃ gets into the oil reservoir that oil reservoir heats nearly well, makes the oil reservoir burning, and continuation injection air is kept burning after the oil reservoir burning; Treating that burning kept between 10 days to 100 days and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part, causes the hydro-thermal exothermic reaction.
It all is mature technology that the downhole electric heater of the embodiment of the invention adds the structural configuration of equipment that hot distilled water, gas use, technological parameter, injection well etc., does not belong to protection domain of the present invention.The injection technology parameter comprises pressure, temperature, flow velocity, time etc.
The beneficial effect of the embodiment of the invention is; The embodiment of the invention is come displacement crude oil through the hydro-thermal exothermic reaction; The hydro-thermal exothermic reaction is that complicated series reaction such as desulfurization, denitrogenation, hydrogenation, open loop and water-gas shift take place for high-temperature water vapor and crude oil; This reaction produces a large amount of heat, generates a large amount of hydrocarbon gas, hydrogen, carbon dioxide and carbon monoxide, and crude oil is carried out upgrading.Because it is huge to give birth to heat, in case initiation reaction, as long as continue to provide water vapour, exothermic reaction promptly can continue, and in oil reservoir, forms the constantly high temperature leading edge of expansion.Its high temperature leading-edge radius of experiment proof enlarges 0.8 meter every day at least, and this is very large speed.Drive the distillation of inswept zone owing to high temperature in leading edge, most of component can become gaseous state in the crude oil, thereby is driven away, and the oil reservoir oil displacement efficiency is very high.The quantity of steam of this reaction needed is less than conventional steam flooding, but oil displacement efficiency is higher than steam flooding far away.Compare with combustion in situ, after burning area expands to a certain degree, inject air capacity and be difficult to meet the demands, still, the injection water vapour is kept the expansion of high temperature leading edge and is not had difficulties.Therefore have very high economic benefit, recovery ratio and rate of oil production.
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment 1:
The block in certain oil field, reservoir depth be at 1000 meters, 30 ℃ of reservoir temperatures, and 10 meters of core intersections, had carried out the depleted formula production of steam soak at 2000 milli handkerchief seconds of viscosity of crude.The mode of this overseas crude oil is to inject a certain amount of conventional water vapour to a bite well, just recovers the oil at this mouthful well then.Steam gets into oil reservoir, heats the crude oil of nearly well, and crude oil is heated back viscosity to be reduced, can be smoothly by extraction.Produce a period of time near wellbore zone temperature and reduce, output reduces, and steam injection begins new round process again.Through after several the wheel, the pressure of oil reservoir reduces, and output reduces, and is called depleted formula exploitation.Formation pressure is 4 MPas after depleted formula is produced.Recovery ratio 25%, field output reduces.Determine to carry out high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal, inject the oil production method of saturated vapour then.
Consult Fig. 2.The first step: improve the oil-producing region well pattern, adopt nine-spot pattern, inject well 11,12 one-tenth rectangular arranged of 12,8 mouthfuls of producing wells of 8 mouthfuls of producing wells are arranged on every side in the centre.Injecting well 11 has 100～150 meters apart from nearer producing well 12, has 140～212 meters apart from producing well 2 far away.Present embodiment is to have 100 meters apart from nearer producing well 12, has 140 meters apart from producing well 12 far away.Inject well and be connected with the equipment that injects saturated vapour and inject distilled water, inject well and be connected with electric heating equipment, producing well is connected with oil production equipment.
Second step: consult Fig. 3, inject distilled water, 60 kilograms/hour of flows to injecting well.The shaft bottom electric heater is heated to be high-temperature steam with distilled water, and 50 to 70 kilowatts of the power of heater are adjustable, more than 530 ℃, is principle not burn electric heater through thermometer control vapor (steam) temperature, and temperature is high more good more.High-temperature steam injects oil reservoir.Wherein, the implication of each label is among Fig. 3: distilled water, 6-packer, 7-stratum, 8-high-temperature steam, 9-heater, 10-thermometer that 1-cable, 2-insulated tubing, 3-distilled water inlet, 4-sleeve pipe, 5-inject.
The 3rd step: high-temperature steam injected oil reservoir 10 to 30 days.
The 4th step: stop heating and inject distilled water, in oil pipe, inject saturated vapour through the distilled water inlet.Annotating distilled water is in order to cooperate heater to produce high-temperature steam, to reduce fouling.Injecting light water is after reaction forms, to inject oil reservoir, forms steam under the high temperature in oil reservoir, and scale effect is little in oil reservoir.
Embodiment 2:
The block in certain oil field, reservoir depth be at 1000 meters, 30 ℃ of reservoir temperatures, and 10 meters of core intersections, had carried out the depleted formula production of steam soak at 400 milli handkerchief seconds of viscosity of crude.Formation pressure is 4 MPas after depleted formula is produced.Recovery ratio 25%, field output reduces.Determine to carry out high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal, inject the oil production method of saturated vapour then.
Consult Fig. 2.The first step: improve the oil-producing region well pattern, adopt nine-spot pattern, inject well 11,12 one-tenth rectangular arranged of 12,8 mouthfuls of producing wells of 8 mouthfuls of producing wells are arranged on every side in the centre.Injecting well 11 has 100～150 meters apart from nearer producing well 12, has 140～212 meters apart from producing well 12 far away.Present embodiment is to have 100 meters apart from nearer producing well 12, has 140 meters apart from producing well 12 far away.Inject the equipment that well is connected with steam in jection and injects distilled water, inject well and be connected with electric heating equipment, producing well is connected with oil production equipment.
Second step: consult Fig. 3, inject 2000 milli handkerchief crude oil second, 10 to 100 tons of injection rates to injecting well through the distilled water inlet.
The 3rd step: well-flushing cleans up crude oil in the pit shaft.
The 4th the step: through the distilled water inlet to the down-hole air injection; Gas injection rate 2 to 6 sides/minute (standard state lower volume); The shaft bottom electric heater is a high temperature air with air heat, and 50 to 70 kilowatts of power are adjustable, through thermometer control air temperature more than 450 ℃; Not burn electric heater is principle, and temperature is high more good more.High temperature air injects oil reservoir.
The 5th step: high temperature air injected oil reservoir 10 to 30 days, burnt crude oil.
The 6th step: stop heating and inject air, in oil reservoir, inject saturated vapour.
Embodiment 3:
The block in certain oil field, reservoir depth be at 1000 meters, 30 ℃ of reservoir temperatures, and 10 meters of core intersections, had carried out the depleted formula production of steam soak at 20000 milli handkerchief seconds of viscosity of crude.Formation pressure is 4 MPas after depleted formula is produced.Recovery ratio 25%, field output reduces.Determine to carry out high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal, inject the oil production method of saturated vapour then.
Consult Fig. 2.The first step: improve the oil-producing region well pattern, adopt nine-spot pattern, inject well 11,12 one-tenth rectangular arranged of 12,8 mouthfuls of producing wells of 8 mouthfuls of producing wells are arranged on every side in the centre.Injecting well 11 has 100～150 meters apart from nearer producing well 12, has 140～212 meters apart from producing well 2 far away.Present embodiment is to have 100 meters apart from nearer producing well 12, has 140 meters apart from producing well 12 far away.Inject the equipment that well is connected with steam in jection and injects distilled water, inject well and be connected with electric heating equipment, producing well is connected with oil production equipment.
Second step: consult Fig. 3; Through the distilled water inlet to the down-hole air injection, gas injection rate 2 to 6 sides/minute (standard state lower volume), the shaft bottom electric heater is a high temperature air with air heat; 50 to 70 kilowatts of power are adjustable; More than 450 ℃, is principle not burn electric heater through thermometer control air temperature, and temperature is high more good more.High temperature air injects oil reservoir.
The 3rd step: high temperature air injected oil reservoir 10 to 30 days.
The 4th step: stop heating, continue to inject air, gas injection rate increases (increasing degree belongs to mature technology, does not belong to the scope of the invention) gradually.
The 5th step: continue to inject air 50 days to 300 days.The temperature of combustion in situ is relevant with the concrete situation of oil reservoir, and is very high in the temperature of some oil field combustion in situ, and the conventional steam of so direct injection just can cause the hydro-thermal exothermic reaction; And the temperature of some oil field combustion in situ is not enough to cause the hydro-thermal exothermic reaction, therefore before igniting, need in oil reservoir, inject the high crude oil of ignition temperature; Like this after the ignition; The burning crude oil temperature of this part injection is very high, then, injects conventional steam; Can cause the hydro-thermal exothermic reaction, viscosity of crude combustion temperatures more is high more.
The 6th step: stop air injection, in oil pipe, inject saturated vapour.
Embodiment 4:
The block in certain oil field, reservoir depth be at 2000 meters, 50 ℃ of reservoir temperatures, and 10 meters of core intersections, had carried out depleted formula and water filling production at 5 milli handkerchief seconds of viscosity of crude.Formation pressure is 12 MPas.Recovery ratio 25%, field output reduces.Determine to carry out high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal, inject the oil production method of saturated vapour then.
Consult Fig. 2.The first step: improve the oil-producing region well pattern, adopt nine-spot pattern, inject well 11,12 one-tenth rectangular arranged of 12,8 mouthfuls of producing wells of 8 mouthfuls of producing wells are arranged on every side in the centre.Injecting well 11 has 150 meters apart from nearer producing well 12, has 212 meters apart from producing well 12 far away.Inject well and be connected with the equipment that injects saturated vapour and inject air, inject well and be connected with electric heating equipment, producing well is connected with oil production equipment.
Second step: consult Fig. 3, inject 2000 milli handkerchief crude oil second, 10 to 100 tons of injection rates to injecting well through the distilled water inlet.
The 3rd step: well-flushing cleans up crude oil in the pit shaft.
The 4th the step: through the distilled water inlet to the down-hole air injection; Gas injection rate 2 to 6 sides/minute (standard state lower volume); The shaft bottom electric heater is a high temperature air with air heat, and 50 to 70 kilowatts of power are adjustable, through thermometer control air temperature more than 450 ℃; Not burn electric heater is principle, and temperature is high more good more.High temperature air injects oil reservoir.
The 5th step: high temperature air injected oil reservoir 10 to 30 days.
The 6th step: stop heating and inject air, in oil pipe, inject saturated vapour.
Aforementioned four embodiment have set forth different situations.Embodiment 1, directly inject high-temperature steam without combustion in situ and cause the hydro-thermal exothermic reaction.The crude oil combustion in situ of 500 milli handkerchief seconds of embodiment 2, oil reservoir medium viscosity possibly can not form and be higher than 530 ℃ high temperature; So need to inject the crude oil of 2000 milli handkerchief seconds; Get into oil reservoir; The high viscosity oil burning produces temperature and is higher than 530 ℃ certainly, and the conventional steam of injection can form and be higher than 530 ℃ high-temperature steam under this high temperature.The crude oil combustion in situ of 20000 milli handkerchief seconds of embodiment 3, oil reservoir medium viscosity forms certainly and is higher than 530 ℃ high temperature, so need not inject crude oil but directly carry out combustion in situ, injects conventional steam then.Embodiment 4, preceding 3 embodiment crude oil all belong to the viscous crude scope, are the crude oil of 5 milli handkerchief seconds in this instance oil reservoir, belong to thin oil, and thin oil is different with the development scheme of viscous crude, and viscous crude generally need heat oil reservoir, and thin oil need not heat oil reservoir.Though this instance is generally not adopt the exploitation of oil reservoir mode of heating in order to be expressed in the thin oil oil reservoir, it still is feasible utilizing hydro-thermal exothermic reaction exploitation.In needs, can implement hydro-thermal exothermic reaction exploitation.
Above embodiment is only in order to the technical scheme of the explanation embodiment of the invention, but not to its restriction; Although the embodiment of the invention has been carried out detailed explanation with reference to previous embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of each embodiment technical scheme of the essence disengaging embodiment of the invention of relevant art scheme.The above specific embodiment only is used to explain the present invention, but not is used to limit the present invention.
Claims (5)
1. one kind is injected the oil production method that oil reservoir causes the hydro-thermal exothermic reaction with high-temperature steam, it is characterized in that said method comprises:
Injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam, produces the high temperature leading edge; The temperature of said high-temperature steam is higher than the critical-temperature that causes said hydro-thermal exothermic reaction;
When definite high-temperature steam injects oil reservoir and reaches the Preset Time scope, inject the saturated vapour or the water of scheduled volume through said injection well continuously to oil reservoir, keep the expansion of said high temperature leading edge.
2. method according to claim 1 is characterized in that, said injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam and comprises:
Inject separately distilled water at said injection well, the distilled water that the electric heater heating of the downhole equipment through said injection well is injected is said high-temperature steam, said high-temperature steam is injected oil reservoir cause the hydro-thermal exothermic reaction.
3. method according to claim 1 is characterized in that, said injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam and also comprises:
Inject air at said injection well, the air that the electric heater heating of the downhole equipment through said injection well is injected, the high temperature air between forming 400 ℃ to 600 ℃ gets into oil reservoir, makes the oil reservoir burning, and continuation injection air is kept burning after the oil reservoir burning;
Treating that burning kept between 10 days to 10 years and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part, causes the hydro-thermal exothermic reaction.
4. method according to claim 1 is characterized in that, said injection well through the oil field injects the exothermic reaction of oil reservoir initiation hydro-thermal with high-temperature steam and also comprises:
In oil reservoir, inject viscosity at the viscous crude of 500 to 5000 milli handkerchiefs between second, back well-flushing then through said injection well;
Inject air, the air that the electric heater heating of the downhole equipment through said injection well is injected, the high temperature air between forming 400 ℃ to 600 ℃ gets into the oil reservoir that oil reservoir heats nearly well, makes the oil reservoir burning, and continuation injection air is kept burning after the oil reservoir burning;
Treating that burning kept between 10 days to 100 days and injects saturated vapour, the high-temperature steam between forming 400 ℃ to 600 ℃ in the high temperature oil reservoir of saturated vapour after burning is expanded to oil deposit deep part, causes the hydro-thermal exothermic reaction.
5. method according to claim 1 is characterized in that, said Preset Time scope is between 1 day to 100 days; The saturated vapour of said scheduled volume is 20-2000 ton every day; The water of said scheduled volume is 1-2000 ton every day.
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