CN102359365B - Method for extracting oil through injecting high temperature steam into oil layer to initiate hydrothermal exothermic - Google Patents
Method for extracting oil through injecting high temperature steam into oil layer to initiate hydrothermal exothermic Download PDFInfo
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Abstract
The invention provides a method for extracting oil through injecting high temperature steam into an oil layer to initiate a hydrothermal exothermic reaction. The method comprises the following steps: the high temperature steam is injected into the oil layer to initiate the hydrothermal exothermic reaction through an injection well of an oil field so as to produce a high temperature leading edge; 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 injected into the oil layer reaches a preset time range for sure, a predetermined amount of saturated steam or water is continuously injected into the oil layer through the injection well so as to maintain the expansion of the high temperature leading edge. According to the method, through injecting the high temperature into the oil layer to initiate the hydrothermal exothermic reaction and then injecting the saturated steam or directly injecting the water into the oil layer, the expansion of the high temperature leading edge is maintained, the crude oil driving efficiency can be increased, and the quality of crude oil is improved through the hydrothermal exothermic reaction.
Description
Technical field
The present invention relates to oil extraction in oil field technical field, particularly a kind of oil production method high-temperature steam being 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, or steam injection method heating oil reservoir, and displace crude oil flows to producing well.Combustion in situ method injects air to enter oil reservoir, electric heater is entered under down-hole, the air that heating is injected, oil reservoir Crude Oil is burnt, after oil reservoir blazes up, stop heating, continue to inject air, maintain burning in oil reservoir and produce heat, crude distillation is gasified thus the technology of the gas-powered be injected into.What the method for steam injection was injected is saturated vapour, heats oil reservoir by saturated vapour.Saturated vapour refers in steam to also have water to exist, its temperature and pressure correlation, more high-temperature is higher (is under atmospheric pressure 100 DEG C for steam pressure, when 4 MPa, temperature is at about 250 DEG C), the method utilizes the heat heating in crude oil of the saturated vapour injected to make it viscosity reduction, and drive crude oil to producing well, because saturated vapour can not cause hydro-thermal exothermic reaction, therefore new heat can not be produced in oil reservoir, need constantly to provide steam to carry out heating in crude oil, required quantity of steam is very large, and oil displacement efficiency is low.
Known by above-mentioned analysis, there is very large defect in the method for prior art: the cost that air injection burns crude oil is very high, and gas injection rate limited being difficult to reaches requirement, is very easy to form channelling simultaneously; There is the problem that quantity of steam is large, oil displacement efficiency is low needed in note saturated vapour method.
Summary of the invention
The embodiment of the present invention provides a kind of and high-temperature steam is injected the method that oil reservoir causes hydro-thermal exothermic reaction, hydro-thermal exothermic reaction is caused by high-temperature steam being injected oil reservoir, then saturated vapour is injected, or directly water filling, maintain the expansion of high temperature leading edge, can improve and drive the efficiency of crude oil, and be improved the quality of crude oil by hydro-thermal exothermic reaction, solve the air needed for prior art or quantity of steam is large and oil recovery efficiency is low problem.
To achieve these goals, the embodiment of the present invention provides a kind of and high-temperature steam is injected the oil production method that oil reservoir causes hydro-thermal exothermic reaction, described method comprises: by the Injection Well in oil field, high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, produce high temperature leading edge; The temperature of described high-temperature steam is higher than the critical-temperature causing described hydro-thermal exothermic reaction; When determining that high-temperature steam injection oil reservoir reaches preset time range, being injected saturated vapour or the water of scheduled volume by described Injection Well to oil reservoir continuously, maintaining the expansion of described high temperature leading edge.
High-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal and comprises by the described Injection Well by oil field: inject distilled water separately at described Injection Well, the distilled water injected by the electric heater heating of the downhole equipment of described Injection Well is described high-temperature steam, described high-temperature steam is injected oil reservoir and causes hydro-thermal exothermic reaction.
High-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal and also comprises by the described Injection Well by oil field: inject air at described Injection Well, by the air that the electric heater heating of the downhole equipment of described Injection Well is injected, high temperature air between forming 400 DEG C to 600 DEG C enters oil reservoir, oil reservoir is burnt, after oil reservoir burning, continues to inject air maintain burning; To be combusted maintaining between 10 days to 10 years injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part, causes hydro-thermal exothermic reaction.
High-temperature steam is injected oil reservoir by the described Injection Well by oil field to be caused hydro-thermal exothermic reaction and also comprises: in oil reservoir, inject the viscous crude of viscosity between 500 to 5000 milli handkerchief seconds by described Injection Well, then well-flushing; Inject air, the air injected by the electric heater heating of the downhole equipment of described Injection Well, the high temperature air between forming 400 DEG C to 600 DEG C enters the oil reservoir that oil reservoir heats nearly well, and oil reservoir is burnt, and continues to inject air and maintain burning after oil reservoir burning; To be combusted maintaining between 10 days to 100 days injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part, causes hydro-thermal exothermic reaction.
Described preset time range is between 1 day to 100 days; The saturated vapour of described scheduled volume is 20-2000 ton every day; The water of described scheduled volume is 1-2000 ton every day.
The beneficial effect of the embodiment of the present invention is, the embodiment of the present invention carrys out displace crude oil by hydro-thermal exothermic reaction, hydro-thermal exothermic reaction is that the series reaction such as complicated desulfurization, denitrogenation, hydrogenation, open loop and water-gas shift occur for high-temperature water vapor and crude oil, this reaction produces a large amount of heat, generate a large amount of hydrocarbon gas, hydrogen, carbon dioxide and carbon monoxide, and upgrading is carried out to crude oil.Because heat-dissipating amount is huge, once initiation reaction, as long as continue to provide water vapour, namely exothermic reaction can continue, and forms the high temperature leading edge of constantly expansion in oil reservoir.Experiment proves that its high temperature leading-edge radius at least expands 0.8 meter every day, and this is very large speed.Drive the distillation of inswept region due to high temperature in leading edge, in crude oil, most of component can become gaseous state, thus is driven away, and oil reservoir oil displacement efficiency is very high.The quantity of steam of this reaction needed is less than conventional steam and drives, but oil displacement efficiency is far away higher than steam flooding.Compared with combustion in situ, expand to a certain degree at burning area, inject air capacity and be difficult to meet the demands, but, inject the expansion of water vapour maintenance high temperature leading edge and do not have difficulties.Therefore there is very high economic benefit, recovery ratio and rate of oil production.
Accompanying drawing explanation
Fig. 1 is the method overall flow figure of the embodiment of the present invention;
Fig. 2 is the recover the oil Injection Well and producing well plane of arrangement schematic diagram of constructing;
Fig. 3 is the schematic diagram of shaft bottom firing equipment.
Detailed description of the invention
The embodiment of the present invention provides a kind of and high-temperature steam is injected the method that oil reservoir causes hydro-thermal exothermic reaction, high-temperature water vapor is injected oil reservoir and causes hydro-thermal exothermic reaction by the method, a large amount of heat is produced in oil reservoir, then saturated vapour is injected, or directly water filling, maintain the expansion of high temperature leading edge, thus realize oil recovery object, this kind ofly improves the recovery ratio of oil reservoir and the oil production method of development effectiveness.High temperature leading edge refers to that the continuous heat-dissipating of hydro-thermal exothermic reaction makes high-temperature region volume increasing, and this high-temperature area expands the edge formed.
Because hydro-thermal exothermic reaction heat-dissipating amount is huge, once initiation reaction, as long as continue to provide water vapour, namely exothermic reaction can continue, and forms the high temperature leading edge of constantly expansion in oil reservoir.Experiment proves that its high temperature leading-edge radius at least expands 0.8 meter every day, and this is very large speed.Drive the distillation of inswept region due to high temperature in leading edge, in crude oil, most of component can become gaseous state, thus is driven away, and oil displacement efficiency is very high.
Compared to the prior art, the conventional steam that the quantity of steam that hydro-thermal exothermic reaction of the present invention needs is less than prior art drives, but oil displacement efficiency is driven higher than conventional steam far away.The combustion in situ mode of prior art, expand to a certain degree at burning area, inject air capacity and be difficult to meet the demands, but, injection water vapour of the present invention maintains the expansion of high temperature leading edge and does not have difficulties, and therefore has very high economic benefit, recovery ratio and rate of oil production.Meanwhile, hydro-thermal exothermic reaction generates a large amount of hydrocarbon gas, hydrogen, carbon dioxide and carbon monoxide, can improve quality after hydrogen and crude oil form hydrogenation reaction to crude oil upgrading, and the useful component such as gasoline, diesel oil in crude oil is increased.
A kind of implementation method of the embodiment of the present invention obtains high-temperature steam to the distilled water heating of injecting.Particularly: under Injection Well, enter electric heater, inject suitable quantity of water simultaneously, produce more than 530 DEG C steam injection stratum in shaft bottom and can cause hydro-thermal exothermic reaction.530 DEG C is the critical-temperature of the initiation hydro-thermal exothermic reaction recorded in test.High-temperature steam just needs when causing hydro-thermal exothermic reaction, once hydro-thermal exothermic reaction is initiated, its heat produced is enough to make saturated vapour and water become high-temperature steam, therefore, once after causing hydro-thermal exothermic reaction, heater has just quit work.After causing hydro-thermal exothermic reaction, inject saturated vapour, or directly water filling, maintain the expansion of high temperature leading edge.
The another kind of implementation method of the embodiment of the present invention injects saturated vapour after combustion in situ to obtain high-temperature steam.The method can cause 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.After carrying out baked wheaten cake a period of time, then saturated vapour can be noted for what determine that combustion in situ temperature is greater than 530 DEG C (being measured by thermometer).And lower than the oil reservoir of 530 DEG C, some thicker crude oil may be injected before ignition in oil reservoir for baked wheaten cake temperature, then light a fire, after determining that burning is normal, note saturated vapour immediately, now the temperature in oil reservoir combustion district is certainly higher than 530 DEG C, can cause hydro-thermal exothermic reaction.Under down-hole, enter electric heater as when aforementioned combustion in situ igniting, the air of oil reservoir is injected in heating, according to the result of testing crude oil, after the temperature injecting oil reservoir reaches a certain value, such as 450 DEG C, crude oil will blaze up, and the temperature of burning can reach more than 600 DEG C.By just judging whether burning is normal according to the temperature entering oil reservoir air during igniting.
The present invention adopt concrete technical scheme be: oil extraction in oil field block have Injection Well and around producing well, Injection Well is connected with the equipment injecting saturated vapour and inject light water and distilled water, or Injection Well is connected with the equipment injecting saturated vapour and inject common water and air, or Injection Well is connected with the equipment injecting saturated vapour, crude oil and inject common water and air, Injection Well is connected with electric heating equipment can inject stratum distilled water in shaft bottom heating, or the air on stratum is injected in heating.Producing well is connected with oil production equipment.
First, inject high-temperature steam and enter oil reservoir.The method injecting high-temperature steam has following three kinds:
Distilled water injects from oil pipe in method 1, elder generation, and casing tube space packer is shut, simultaneously at downhole equipment electric heater, the distilled water that heating is injected, control vapor (steam) temperature more than 530 DEG C by thermometer, not burn electric heater for principle, temperature is more high better.High-temperature steam enters the oil reservoir that oil reservoir heats nearly well.
Method 2, first inject air, simultaneously at downhole equipment electric heater, the air that heating is injected, the high temperature air controlled between formation 400 DEG C to 600 DEG C by thermometer enters the oil reservoir that oil reservoir heats nearly well, oil reservoir is burnt, after oil reservoir burning, continue to inject air maintain burning, to be combusted maintaining between 10 days to 10 years injects steam, and the high-temperature steam between forming 400 DEG C to 600 DEG C in steam high temperature oil reservoir is after combustion expanded to oil deposit deep part.The time of combustion in situ overseas crude oil is relevant with the characteristic of oil reservoir, and can obtain the effect of good extraction crude oil at some oil field combustion in situ, the time can continue longer, bad in the effect of some oil reservoir combustion in situ, just proceeds to hydro-thermal mode early and recovers the oil.
Method 3, first in oil reservoir, inject the viscous crude of viscosity between 500 to 5000 milli handkerchief seconds, then well-flushing, then air is injected, simultaneously at downhole equipment electric heater, the air that heating is injected, high temperature air between forming 400 DEG C to 600 DEG C enters the oil reservoir that oil reservoir heats nearly well, oil reservoir is burnt, after oil reservoir burning, continue to inject air maintain burning, to be combusted maintaining between 10 days to 100 days injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part.
Then, determining that high-temperature steam injects between oil reservoir 1 day to 100 days, the said equipment is utilized to inject saturated vapour or water (now heater quits work) by Injection Well continuously to oil reservoir.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 present invention, and as shown in Figure 1, the method comprises:
S101, by the Injection Well in oil field, high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, produce high temperature leading edge; The temperature of described high-temperature steam is higher than the critical-temperature causing described hydro-thermal exothermic reaction;
S102, determine high-temperature steam inject oil reservoir reach preset time range time, injected saturated vapour or the water of scheduled volume by described Injection Well to oil reservoir continuously, maintain the expansion of described high temperature leading edge.
Wherein, S101 can comprise: in described Injection Well, inject distilled water separately, and the distilled water injected by the electric heater heating of the downhole equipment of described Injection Well is described high-temperature steam, described high-temperature steam is injected oil reservoir and causes hydro-thermal exothermic reaction.
Wherein, S101 can also comprise: in described Injection Well, inject air, the air injected by the electric heater heating of the downhole equipment of described Injection Well, and the high temperature air between forming 400 DEG C to 600 DEG C enters oil reservoir, oil reservoir is burnt, after oil reservoir burning, continues to inject air maintain burning; To be combusted maintaining between 10 days to 10 years injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part, causes hydro-thermal exothermic reaction.
Wherein, S101 can also comprise: in oil reservoir, inject the viscous crude of viscosity between 500 to 5000 milli handkerchief seconds by described Injection Well, well-flushing then; Inject air, the air injected by the electric heater heating of the downhole equipment of described Injection Well, the high temperature air between forming 400 DEG C to 600 DEG C enters the oil reservoir that oil reservoir heats nearly well, and oil reservoir is burnt, and continues to inject air and maintain burning after oil reservoir burning; To be combusted maintaining between 10 days to 100 days injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part, causes hydro-thermal exothermic reaction.
The structural configuration etc. of the equipment that the downhole electric heater of the embodiment of the present invention adds hot distilled water, gas uses, technological parameter, Injection Well is all mature technology, does not belong to scope.Injection technology parameter comprises pressure, temperature, flow velocity, time etc.
The beneficial effect of the embodiment of the present invention is, the embodiment of the present invention carrys out displace crude oil by hydro-thermal exothermic reaction, hydro-thermal exothermic reaction is that the series reaction such as complicated desulfurization, denitrogenation, hydrogenation, open loop and water-gas shift occur for high-temperature water vapor and crude oil, this reaction produces a large amount of heat, generate a large amount of hydrocarbon gas, hydrogen, carbon dioxide and carbon monoxide, and upgrading is carried out to crude oil.Because heat-dissipating amount is huge, once initiation reaction, as long as continue to provide water vapour, namely exothermic reaction can continue, and forms the high temperature leading edge of constantly expansion in oil reservoir.Experiment proves that its high temperature leading-edge radius at least expands 0.8 meter every day, and this is very large speed.Drive the distillation of inswept region due to high temperature in leading edge, in crude oil, most of component can become gaseous state, thus is driven away, and oil reservoir oil displacement efficiency is very high.The quantity of steam of this reaction needed is less than conventional steam and drives, but oil displacement efficiency is far away higher than steam flooding.Compared with combustion in situ, expand to a certain degree at burning area, inject air capacity and be difficult to meet the demands, but, inject the expansion of water vapour maintenance high temperature leading edge and do not have difficulties.Therefore there is very high economic benefit, recovery ratio and rate of oil production.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
One, certain oil field block, reservoir depth is at 1000 meters, and reservoir temperature 30 DEG C, core intersection 10 meters, viscosity of crude 2000 milli handkerchief second, had carried out steam soak exhaustion formula and produced.The mode of this overseas crude oil injects a certain amount of conventional water vapour to a bite well, then just recovers the oil at this mouthful of well.Steam enters oil reservoir, heats the crude oil of nearly well, and crude oil is heated rear viscosity and reduces, and can be plucked out of smoothly.Produce a period of time near wellbore zone temperature to reduce, output reduces, then steam injection starts new round process.After several wheel, the pressure of oil reservoir reduces, and output reduces, and is called that exhaustion formula is developed.Formation pressure is 4 MPas after exhaustion formula is produced.Recovery ratio 25%, field output reduces.Decision is carried out and high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, then injects the oil production method of saturated vapour.
Consult Fig. 2.The first step: improve oil-producing region well pattern, adopts nine-spot pattern, and Injection Well 11, in centre, has 12, the 8 mouthfuls of orthogonal arrangements of producing well 12 of 8 mouthfuls of producing wells around.Injection Well 11 has 100 ~ 150 meters apart from nearer producing well 12, has 140 ~ 212 meters apart from producing well 2 far away.The present embodiment has 100 meters apart from nearer producing well 12, has 140 meters apart from producing well 12 far away.Injection Well is connected with the equipment injecting saturated vapour and inject distilled water, and Injection Well is connected with electric heating equipment, and producing well is connected with oil production equipment.
Second step: consult Fig. 3, injects distilled water to Injection Well, flow 60 kgs/hour.Distilled water is heated to be high-temperature steam by shaft bottom electric heater, and the power 50 to 70 kilowatts of heater is adjustable, and control vapor (steam) temperature more than 530 DEG C by thermometer, not burn electric heater for principle, temperature is more high better.High-temperature steam injects oil reservoir.Wherein, in Fig. 3, the implication of each label is: the distilled water that 1-cable, 2-insulated tubing, 3-distilled water inlet, 4-sleeve pipe, 5-inject, 6-packer, 7-stratum, 8-high-temperature steam, 9-heater, 10-thermometer.
3rd step: high-temperature steam injects oil reservoir 10 to 30 days.
4th step: stop heating and inject distilled water, injecting saturated vapour by distilled water inlet in oil pipe.Note distilled water is to coordinate heater to produce high-temperature steam, reducing fouling.Injecting light water is that after reaction is formed, inject oil reservoir, form steam under the high temperature in oil reservoir, in oil reservoir, scale effect is little.
Embodiment 2:
One, certain oil field block, reservoir depth is at 1000 meters, and reservoir temperature 30 DEG C, core intersection 10 meters, viscosity of crude 400 milli handkerchief second, had carried out steam soak exhaustion formula and produced.Formation pressure is 4 MPas after exhaustion formula is produced.Recovery ratio 25%, field output reduces.Decision is carried out and high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, then injects the oil production method of saturated vapour.
Consult Fig. 2.The first step: improve oil-producing region well pattern, adopts nine-spot pattern, and Injection Well 11, in centre, has 12, the 8 mouthfuls of orthogonal arrangements of producing well 12 of 8 mouthfuls of producing wells around.Injection Well 11 has 100 ~ 150 meters apart from nearer producing well 12, has 140 ~ 212 meters apart from producing well 12 far away.The present embodiment has 100 meters apart from nearer producing well 12, has 140 meters apart from producing well 12 far away.Injection Well is connected with the equipment injecting steam and inject distilled water, and Injection Well is connected with electric heating equipment, and producing well is connected with oil production equipment.
Second step: consult Fig. 3, injects 2000 milli handkerchief crude oil second by distilled water inlet to Injection Well, injection rate 10 to 100 tons.
3rd step: well-flushing, cleans up pit shaft Crude Oil.
4th step: by distilled water inlet to down-hole air injection, gas injection rate 2 to 6 side/point (standard state lower volume), air heat is high temperature air by shaft bottom electric heater, power 50 to 70 kilowatts is adjustable, air themperature is controlled more than 450 DEG C by thermometer, not burn electric heater for principle, temperature is more high better.High temperature air injects oil reservoir.
5th step: high temperature air injects oil reservoir 10 to 30 days, carries out baked wheaten cake crude oil.
6th step: stop heating and inject air, inject saturated vapour in oil reservoir.
Embodiment 3:
One, certain oil field block, reservoir depth is at 1000 meters, and reservoir temperature 30 DEG C, core intersection 10 meters, viscosity of crude 20000 milli handkerchief second, had carried out steam soak exhaustion formula and produced.Formation pressure is 4 MPas after exhaustion formula is produced.Recovery ratio 25%, field output reduces.Decision is carried out and high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, then injects the oil production method of saturated vapour.
Consult Fig. 2.The first step: improve oil-producing region well pattern, adopts nine-spot pattern, and Injection Well 11, in centre, has 12, the 8 mouthfuls of orthogonal arrangements of producing well 12 of 8 mouthfuls of producing wells around.Injection Well 11 has 100 ~ 150 meters apart from nearer producing well 12, has 140 ~ 212 meters apart from producing well 2 far away.The present embodiment has 100 meters apart from nearer producing well 12, has 140 meters apart from producing well 12 far away.Injection Well is connected with the equipment injecting steam and inject distilled water, and Injection Well is connected with electric heating equipment, and producing well is connected with oil production equipment.
Second step: consult Fig. 3, by distilled water inlet to down-hole air injection, gas injection rate 2 to 6 side/point (standard state lower volume), air heat is high temperature air by shaft bottom electric heater, power 50 to 70 kilowatts is adjustable, control air themperature more than 450 DEG C by thermometer, not burn electric heater for principle, temperature is more high better.High temperature air injects oil reservoir.
3rd step: high temperature air injects oil reservoir 10 to 30 days.
4th step: stop heating, continue to inject air, gas injection rate increases gradually (increasing degree belongs to mature technology, does not belong to the scope of the invention).
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, very high in the temperature of some oil field combustion in situ, so direct injection conventional steam just can cause hydro-thermal exothermic reaction, and the temperature of some oil field combustion in situ is not enough to cause hydro-thermal exothermic reaction, therefore before ignition, need in oil reservoir, inject the high crude oil of ignition temperature, after such ignition, this part burning crude oil temperature injected is very high, then, inject conventional steam, can cause hydro-thermal exothermic reaction, viscosity of crude more combustion temperatures is higher.
6th step: stop air injection, inject saturated vapour in oil pipe.
Embodiment 4:
One, certain oil field block, reservoir depth is at 2000 meters, and reservoir temperature 50 DEG C, core intersection 10 meters, viscosity of crude 5 milli handkerchief second, carried out exhaustion formula and flooding production.Formation pressure is 12 MPas.Recovery ratio 25%, field output reduces.Decision is carried out and high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, then injects the oil production method of saturated vapour.
Consult Fig. 2.The first step: improve oil-producing region well pattern, adopts nine-spot pattern, and Injection Well 11, in centre, has 12, the 8 mouthfuls of orthogonal arrangements of producing well 12 of 8 mouthfuls of producing wells around.Injection Well 11 has 150 meters apart from nearer producing well 12, has 212 meters apart from producing well 12 far away.Injection Well is connected with the equipment injecting saturated vapour and inject air, and Injection Well is connected with electric heating equipment, and producing well is connected with oil production equipment.
Second step: consult Fig. 3, injects 2000 milli handkerchief crude oil second by distilled water inlet to Injection Well, injection rate 10 to 100 tons.
3rd step: well-flushing, cleans up pit shaft Crude Oil.
4th step: by distilled water inlet to down-hole air injection, gas injection rate 2 to 6 side/point (standard state lower volume), air heat is high temperature air by shaft bottom electric heater, power 50 to 70 kilowatts is adjustable, air themperature is controlled more than 450 DEG C by thermometer, not burn electric heater for principle, temperature is more high better.High temperature air injects oil reservoir.
5th step: high temperature air injects oil reservoir 10 to 30 days.
6th step: stop heating and inject air, inject saturated vapour in oil pipe.
Aforementioned four embodiments have set forth different situations.Embodiment 1, directly to inject high-temperature steam without combustion in situ and cause hydro-thermal exothermic reaction.The crude oil combustion in situ of embodiment 2, oil reservoir medium viscosity 500 milli handkerchief second may can not form the high temperature higher than 530 DEG C, so need the crude oil of injection 2000 milli handkerchief second, enter oil reservoir, high viscosity oil burning produces temperature certainly higher than 530 DEG C, injects conventional steam and can form high-temperature steam higher than 530 DEG C under this high temperature.The crude oil combustion in situ of embodiment 3, oil reservoir medium viscosity 20000 milli handkerchief second forms the high temperature higher than 530 DEG C certainly, so do not need inject crude oil but directly carry out combustion in situ, then injects conventional steam.Embodiment 4, front 3 embodiment crude oil all belong to viscous crude scope, and be the crude oil of 5 milli handkerchief seconds in this example oil reservoir, belong to thin oil, thin oil is different from the development scheme of viscous crude, and viscous crude generally needs to heat oil reservoir, and thin oil does not need heating oil reservoir.Although this example does not generally adopt oil reservoir mode of heating to exploit to be expressed in thin oil oil reservoir, it is still feasible for utilizing hydro-thermal exothermic reaction to develop.When needs, hydro-thermal exothermic reaction exploitation can be implemented.
Above embodiment only in order to the technical scheme of the embodiment of the present invention to be described, is not intended to limit; Although be described in detail the embodiment of the present invention with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the embodiment of the present invention.Above detailed description of the invention is to illustrate the invention and not to limit the present invention.
Claims (5)
1. high-temperature steam is injected the oil production method that oil reservoir causes hydro-thermal exothermic reaction, it is characterized in that, described method comprises:
By the Injection Well in oil field, high-temperature steam is injected oil reservoir and cause hydro-thermal exothermic reaction, produce high temperature leading edge; The temperature of described high-temperature steam is higher than the critical-temperature causing described hydro-thermal exothermic reaction, and described critical-temperature is 530 DEG C;
When determining that high-temperature steam injection oil reservoir reaches preset time range, being injected saturated vapour or the water of scheduled volume by described Injection Well to oil reservoir continuously, maintaining the expansion of described high temperature leading edge.
2. method according to claim 1, is characterized in that, high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal and comprises by the described Injection Well by oil field:
In described Injection Well, inject distilled water separately, the distilled water injected by the electric heater heating of the downhole equipment of described Injection Well is described high-temperature steam, described high-temperature steam is injected oil reservoir and causes hydro-thermal exothermic reaction.
3. method according to claim 1, is characterized in that, high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal and also comprises by the described Injection Well by oil field:
In described Injection Well, inject air, the air injected by the electric heater heating of the downhole equipment of described Injection Well, the high temperature air between forming 400 DEG C to 600 DEG C enters oil reservoir, and oil reservoir is burnt, and continues to inject air and maintain burning after oil reservoir burning;
To be combusted maintaining between 10 days to 10 years injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part, causes hydro-thermal exothermic reaction.
4. method according to claim 1, is characterized in that, high-temperature steam is injected the exothermic reaction of oil reservoir initiation hydro-thermal and also comprises by the described Injection Well by oil field:
In oil reservoir, the viscous crude of viscosity between 500 to 5000 milli handkerchief seconds is injected, well-flushing then by described Injection Well;
Inject air, the air injected by the electric heater heating of the downhole equipment of described Injection Well, the high temperature air between forming 400 DEG C to 600 DEG C enters the oil reservoir that oil reservoir heats nearly well, and oil reservoir is burnt, and continues to inject air and maintain burning after oil reservoir burning;
To be combusted maintaining between 10 days to 100 days injects saturated vapour, and the high-temperature steam between forming 400 DEG C to 600 DEG C in saturated vapour high temperature oil reservoir is after combustion expanded to oil deposit deep part, causes hydro-thermal exothermic reaction.
5. method according to claim 1, is characterized in that, described preset time range is between 1 day to 100 days; The saturated vapour of described scheduled volume is 20-2000 ton every day; The water of described scheduled volume is 1-2000 ton every day.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110261984.5A CN102359365B (en) | 2011-09-06 | 2011-09-06 | Method for extracting oil through injecting high temperature steam into oil layer to initiate hydrothermal exothermic |
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| CN201110261984.5A CN102359365B (en) | 2011-09-06 | 2011-09-06 | Method for extracting oil through injecting high temperature steam into oil layer to initiate hydrothermal exothermic |
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| CN102359365A CN102359365A (en) | 2012-02-22 |
| CN102359365B true CN102359365B (en) | 2015-02-25 |
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| CN104405354B (en) * | 2014-10-22 | 2017-03-15 | 西南石油大学 | A kind of improved thick oil thermal recovery method and device |
| CN106089170B (en) * | 2016-08-01 | 2018-11-27 | 中嵘能源科技集团有限公司 | It is a kind of to heat spontaneous ignition method to thick oil filling high-temperature-hot-water |
| CN106089164A (en) * | 2016-08-01 | 2016-11-09 | 中嵘能源科技集团有限公司 | A kind of air-injection displacement method of straight well air injection horizontal well production |
| CN106050206A (en) * | 2016-08-01 | 2016-10-26 | 中嵘能源科技集团有限公司 | Air drive reservoir oxygen-enriched gas injection spontaneous ignition method |
| CN109779589B (en) * | 2017-11-13 | 2021-01-29 | 中国石油天然气股份有限公司 | Reservoir transformation method for igneous rock thick oil reservoir |
| CN108872295B (en) * | 2018-03-23 | 2020-12-01 | 中国石油天然气股份有限公司 | Method and device for determining ignition parameters of crude oil |
| CN113530507A (en) * | 2020-04-15 | 2021-10-22 | 中国石油天然气股份有限公司 | Method for improving dryness of underground steam |
| CN112832727A (en) * | 2021-01-15 | 2021-05-25 | 栾云 | Underground ignition and oil displacement method using coiled tubing to carry electromagnetic wave heating system |
| CN114737937B (en) * | 2022-04-18 | 2023-07-04 | 中国海洋石油集团有限公司 | Reaction heat control method in oil displacement process of heavy oil in-situ exothermic reaction |
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