CN101139923B - Method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving - Google Patents
Method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving Download PDFInfo
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Abstract
A method to excavate deep heavy oil reservoir with carbon dioxide auxiliary steam drives is provided, which adapts to oil field exploitation. The method is characterized by exploiting deep heavy oil reservoir with a composite rod drive for straight wells and horizontal wells. Meanwhile, the invention is designed to fill carbon dioxide gas at the same time of filling steam. The specific value of underground volume in cold water equivalent weight between the carbon dioxide and steam is 8 to 10; total injection volume of the carbon dioxide is 0.2 to 0.5PV. The targets are that: solving the problem that, the traditional method of only injecting steam into deep heavy oil reservoirs is difficult to meet with steam drive requirements, so that oil-steam ratio and percent recovery are both too low. After meeting cold oil at the early stage of transcending condensed water, the carbon dioxide can solve some raw oil, lower viscosity, improve raw oil fluidity, shorten low-yield period in the preliminary stage of the steam drive, and improve oil recovery speed. On the basis of steam throughput, the method can improve yield extent by about 30 percent, and accumulated oil-steam ratio can be higher than 0.20; taking yield extent during the throughput stage into considerations, total percent recovery can reach about 50 percent.
Description
Technical field
The present invention relates to the oilfield exploitation technical field, particularly a kind of method of utilizing high steam to drive heavy crude producing.Be a kind of behind the steam soak of oil field, utilize the carbon dioxide assisted steam flooding to improve recovery factor of heavy oil reservoir and rate of oil production method.
Background technology
In the heavy crude reservoir oil recovery process, employed vapour driving oil recovery oil tech is the substituted technique of steam oil production.As Fig. 1 represented be conventional straight well steam flooding inverted nine-spot pattern.What conventional vapour driving oil recovery was used is straight well and the well pattern form that straight well makes up, and annotates vapour continuously in well by the notes vapour well 1 in centre, by adjacent producing well 2 continuous extraction crude oil on every side.Theoretical research both at home and abroad and field practice show, realize that successfully the index that steam drive oil production should reach is that actual recovery ratio is near the due recovery ratio of reservoir condition.Want to reach this index, must satisfy four condition: A, steam injection speed simultaneously at 1.6～1.8m
3Between/the d.ha.m; B, production-injection ratio are between 1.2～1.3; C, shaft bottom steam quality are greater than 40%; D, reservoir pressure are less than 5MPa.Consult: work such as Yue Qingshan, " heavy crude reservoir steam injection development technology ", P
26, in September, 1998, petroleum industry publishing house publishes.
The heavy crude reservoir that China's viscous crude field accounts for 60% oil in place greatly belongs to the deep layer oil reservoir, and the deep layer reservoir buried depth is between 900～1700m.The deep layer oil reservoir is implemented steam drive oil production, be difficult to satisfy simultaneously above-mentioned four conditions.Annotating vapour satisfies the shaft bottom steam quality greater than 40% at a high speed so people covet.Steam-front is met cold oil and is condensed into water, has reduced the speed of Steam Heating oil reservoir.Therefore, adopt at a high speed and annotate the vapour method, production-injection ratio is difficult to reach requirement, causes the output that has high input little; Reach requirement if want to satisfy production-injection ratio, adopt low speed to annotate the target that vapour is difficult to realize shaft bottom mass dryness fraction 40% again, the viscous crude extraction of deep layer oil reservoir down-hole can't be come.Here it is, and China's viscous crude field adopts the state of the art of steam flooding.Simultaneously, at the viscous crude field steam flooding initial stage, also there is long low term.As Fig. 2 represented be the steam drive oil production rate curve.The low term of steam drive oil production, average out to 6～10 months, have in addition greater than 1 year, be unfavorable for the raising of rate of oil production, the characteristics of Here it is existing steam drive oil production method itself determine.
Improve deep-layer heavy crude reservoir steam drive oil production effect, must seek the steam drive oil production method of a kind of suitable China heavy crude reservoir, break the convention of single for a long time pursuit high speed steam injection.
Summary of the invention
The purpose of this invention is to provide a kind of method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving, utilize carbon dioxide can dissolve viscous crude, reduce the non-condensate gas volume property of viscosity of crude, realize that buried depth after the high round of deep-layer heavy crude reservoir of 900m～1700m is handled up, further improves the operational method of deep-layer heavy crude reservoir recovery ratio.The shaft bottom steam quality that can not only effectively remedy the steam flooding requirement is greater than 40% deficiency, and can shorten the low term of steam flooding initial stage again, improves rate of oil production.Overcome existing steam flooding long problem in low term.The single steam injection mass dryness fraction of solution deep-layer heavy crude reservoir tradition is difficult to satisfy vapour and drives requirement, causes the problem that gas oil ratio is low, recovery ratio is low.
The technical solution used in the present invention is: method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving, the steam drive development deep-layer heavy crude reservoir that adopts auxiliary straight well of carbon dioxide and horizontal well to make up, the well pattern that promptly adopts straight well notes vapour, new horizontal well drilling to recover the oil.Utilize the advantage that horizontal well and oil reservoir contact area are big, the draining ability is strong, guarantee to realize that vapour drives in the process production-injection ratio between 1.2～1.3.Take injecting carbon dioxide gas in the straight well steam injection.Carbon dioxide is 8～10 with steam cold water equivalent subsurface volume ratio.In steam in jection and carbon dioxide, recover the oil continuously at new horizontal well drilling.When the total injection rate of carbon dioxide is 0.1～0.3PV, stops injecting carbon dioxide, but continue steam in jection.Recover the oil continuously at new horizontal well drilling.
Utilize carbon dioxide can dissolve viscous crude, reduce the non-condensate gas volume property of viscosity of crude, remedy the condensation of steam chance and form the adverse effect of water.Carbon dioxide is surmounting condensation water leading edge, after meeting with the cold oil band, is partly dissolved, and reduces viscosity of crude, improves crude oil fluidity; And crude oil is expanded, encourage the effect of condensed water leading edge crude oil in advance, form non-phase-mixing driving.Like this, the oil displacement process of carbon dioxide assisted steam flooding is carbon dioxide/steam+distillation+vapour condensation zone+carbon dioxide viscosity reduction band+cold oil district in oil reservoir, as shown in Figure 4.Because the incentive action that carbon dioxide shifts to an earlier date has increased the flowability of the cold oil band that is not heated by steam, thereby has improved the rate of oil production of crude oil, shortens the low term of pure steam flooding process.
Specific practice is:
A, selection are fit to the oil reservoir of carbon dioxide assisted steam flooding
According to oil field geologic feature and exploitation present situation, carry out the oil field coarse screening.The oil reservoir that is fit to the carbon dioxide assisted steam flooding meets the following conditions: oil reservoir is deeply between 1300～1700m; Remaining oil saturation＞0.45, oil reservoir gross thickness＞10.0m, clean gross thickness ratio＞0.5, average oil reservoir degree of porosity＞0.20, coefficient of permeability variation＜0.7.
Well group is implemented in B, selection
In the oil reservoir that is fit to the carbon dioxide assisted steam flooding, determine to implement well group.Implementing well group should satisfy: new horizontal well drilling between the straight well of implementing huff and puff oil recovery.The plan range of promptly having implemented the straight well of huff and puff oil recovery and having prepared new horizontal well drilling is between 30～50m.
C, horizontal well drilling
Horizontal well drilling between the straight well of once implementing huff and puff oil recovery, the horizontal section length of horizontal well are between 200～500m, and the horizontal segment of horizontal well is in the straight well oil reservoir of huff and puff oil recovery.The engineers and technicians of this area can finish new horizontal well drilling construction.This well pattern is utilized the advantage that horizontal well and oil reservoir contact area are big, the draining ability is strong, guarantees to realize that vapour drives in the process production-injection ratio between 1.2～1.3.Consult accompanying drawing 3.
D, the new horizontal well drilling of preheating
Carried out steam oil production 1～2 year at the new horizontal well that bores, handled up for 2～3 cycles, purpose is the oil reservoir around the new horizontal well drilling of preheating, forms thermal communication with annotating the vapour straight well, makes horizontal well and annotates that temperature raises 20～30 ℃ than oil reservoir original temperature between the vapour straight well
The ground installation peace of E, carbon dioxide assisted steam flooding
The notes vapour well of implementing the carbon dioxide assisted steam flooding is the straight well of once implementing steam oil production around the new horizontal well drilling; The producing well of implementing the carbon dioxide assisted steam flooding is new horizontal well drilling.At the straight well well head of implementing steam oil production carbon dioxide injection pump and steam heating boiler are installed.Operating pressure 15～the 20MPa of carbon dioxide injection pump, 15 tons/hour of discharge capacities, the operating pressure 15～18MPa of steam heating boiler, 20 tons/hour of discharge capacities.At new horizontal well drilling well head oil pumper and petroleum pipeline are installed.
F, steam in jection and carbon dioxide are implemented the carbon dioxide assisted steam flooding
In the straight well of once implementing huff and puff oil recovery, inject pure carbon dioxide and steam continuously.Carbon dioxide, steam inject with carbon dioxide injection pump group and steam heating boiler respectively.Well group steam injection speed is at 1.2～1.6m
3/ d.ha.m (ha-hectare, unit of area, 1ha=10,000 square metre; The m-core intersection, rice); The shaft bottom steam quality is 25～30%, and the injection rate of carbon dioxide is 8～10 with the subsurface volume ratio of carbon dioxide and steam cold water equivalent.In steam in jection and carbon dioxide, recover the oil continuously at new horizontal well drilling.
G, stop injecting carbon dioxide
When total injection total amount of carbon dioxide reaches 0.1～0.3PV of this well group reservoir volume, stop injecting carbon dioxide, but continue steam in jection.Recover the oil continuously at new horizontal well drilling.
Beneficial effect of the present invention: method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving of the present invention is compared with existing steam drive oil production bigger improvement, and the single steam injection that breaks traditions is difficult to realize the requirement of recovery ratio.Developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving can reach production-injection ratio and remain on more than 1.2.On the basis of steam soak, can improve recovery percent of reserves about 30.0%, gas oil ratio can reach more than 0.20, adds the recovery percent of reserves in the stage of handling up, and overall recovery factor can reach about 50.0%.
Adopt mode of the present invention to develop deep-layer heavy crude reservoir and can obtain following effect:
(1) steam quality is that the recovery ratio of 30% carbon dioxide assisted steam flooding is identical with the recovery ratio of the pure steam flooding of steam quality 50%;
(2) rate of oil production of carbon dioxide assisted steam flooding is compared with the rate of oil production of pure steam flooding, improves 1.2%～1.5%;
(3) the low term of carbon dioxide assisted steam flooding, shortened 2～3 months the low term during than pure steam flooding;
(4) only at injecting carbon dioxide in the early stage of carbon dioxide assisted steam flooding, the 0.1～0.3PV that reaches well group reservoir volume when total injection rate of carbon dioxide stops injecting carbon dioxide.
Description of drawings
Fig. 1 is existing straight well steam flooding inverted nine-spot pattern floor map.
Fig. 2 is existing straight well steam drive oil production rate curve schematic diagram.The vertical line left side is low term, and vertical line the right is high term.
Fig. 3 is a method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving well pattern floor map of the present invention.It is the schematic diagram of embodiment 1 and embodiment 2.
Fig. 4 a is a method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving, from straight well injecting carbon dioxide and steam, to the oil displacement process mechanism schematic diagram of horizontal well extraction crude oil.
Fig. 4 b is existing straight well steam flooding method, from the straight well steam in jection, to the oil displacement process mechanism schematic diagram of extraction crude oil.
Among the figure, 1. straight well producing well, 2. straight well steamed well, 3. straight well steam injection and carbon dioxide well, 4. horizontal well production well, 5. steam zone, 6. distillation band, 7. vapour condensation zone, 8. carbon dioxide viscosity reduction band, 9. cold oil band.
The specific embodiment
With specific embodiment the present invention is described in further detail in conjunction with the accompanying drawings.
Embodiment 1: consult accompanying drawing 3.Method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving of the present invention is tried out in certain oil field.The metaideophone carbon dioxide assisted straight well and horizontal well combined steam to drive the condition of exploitation after this oil field was fit to the high round steam soak of deep-layer heavy crude reservoir.Through the oil reservoir that long-term steam soak mode is recovered the oil, pressure has dropped to below the 3MPa, and remaining oil mainly is distributed in cross-hole region, is fit to adopt the steam drive development mode to the stratum makeup energy.Therefore, between the abundant well of remaining oil, bore flatly and encrypt horizontal well, handled up earlier for 2～3 cycles, after treating to form thermal communication, can change straight well carbon dioxide injection and steam over to, encrypt the carbon dioxide assisted steam flooding exploitation of horizontal well production with straight well.
Specific practice is:
A, selection are fit to the oil reservoir of carbon dioxide assisted steam flooding
The reservoir buried depth in certain oil field is at 1500m, and effective pay thickiness is 35.0m, and the clean gross thickness ratio of oil reservoir is 0.86, and average pore is 24%, mean permeability 1500md, and coefficient of permeability variation 0.64, viscosity of crude is 500-700cp under the reservoir condition.Steam soak exploitation 20 years has been adopted in the oil field, and the stratum moisture content is higher, and steam soak stage recovery percent of reserves is 23.0%, and strata pressure is 2～3MPa.
Well group is implemented in B, selection
Consult Fig. 3.In this oil field was fit to the oil reservoir of carbon dioxide assisted steam flooding, determining to implement well group had 9 mouthfuls of straight wells.This well group had been implemented can newly bore the water horizontal well between the straight well of huff and puff oil recovery.Promptly implemented the straight well and the plan range 45m for preparing new horizontal well drilling of huff and puff oil recovery.
C, horizontal well drilling
Implementing to bore the water horizontal well between the straight well of steam oil production, the horizontal section length of horizontal well is 300m, and the horizontal segment of horizontal well is in the straight well oil reservoir of huff and puff oil recovery.Consult Fig. 3.This well pattern is utilized the advantage that horizontal well and oil reservoir contact area are big, the draining ability is strong, guarantees to realize that vapour drives in the process production-injection ratio between 1.2～1.3.
D, the new horizontal well drilling of preheating
Carried out steam oil production 13 months at the new horizontal well that bores, handled up for 2 cycles, the oil reservoir around the new horizontal well drilling of preheating makes horizontal well and annotates that temperature raises 20 ℃ than oil reservoir original temperature between the vapour straight well.
The ground installation of E, carbon dioxide assisted steam flooding is installed
The notes vapour well of implementing the carbon dioxide assisted steam flooding is a straight well of implementing steam oil production; The producing well of implementing the carbon dioxide assisted steam flooding is new horizontal well drilling.At the straight well well head of implementing huff and puff oil recovery carbon dioxide injection pump and steam heating boiler are installed.The operating pressure of carbon dioxide injection pump is 18MPa, and 15 tons/hour of discharge capacities, the operating pressure of steam heating boiler are 16MPa, 20 tons/hour of discharge capacities.At new horizontal well drilling well head oil pumper and petroleum pipeline are installed.
F, steam in jection and carbon dioxide are implemented the carbon dioxide assisted steam flooding
In the straight well of implementing huff and puff oil recovery, mix continuously and inject pure carbon dioxide and steam.Carbon dioxide, steam inject with carbon dioxide injection pump group and steam heating boiler respectively.Well group steam injection speed is 1.3m
3/ d.ha.m (ha-hectare, unit of area, 1ha=10,000 square metre; The m-core intersection, rice); The shaft bottom steam quality is 30%, and the injection rate of carbon dioxide is 10 with the subsurface volume ratio of carbon dioxide and steam cold water equivalent.When implementing steam in jection and carbon dioxide, recover the oil continuously at new horizontal well drilling.
G, stop injecting carbon dioxide
When total injection rate of carbon dioxide reaches the 0.15PV of well group reservoir volume, stop injecting carbon dioxide, but continue steam in jection, recover the oil continuously at new horizontal well drilling.
Can reach production-injection ratio remains on more than 1.2.On the basis of steam soak, can improve recovery percent of reserves 26.5%, gas oil ratio can reach more than 0.20, adds the recovery percent of reserves in the stage of handling up, and overall recovery factor can reach 49.5%.
Certain oil field reservoir buried depth is at 1300m, and effective pay thickiness is 30.0m, and the clean gross thickness ratio of oil reservoir is 0.65, and average pore is 22.0%, mean permeability 1000md, and coefficient of permeability variation 0.60, viscosity of crude is 400-500cp under the reservoir condition.Steam soak exploitation 15 years has been adopted in the oil field, and the stratum moisture content is higher, and steam soak stage recovery percent of reserves is 20.0%, strata pressure 4～5MPa.Adopt the carbon dioxide assisted steam flooding to develop this oil field deep-layer heavy crude reservoir.
A, selection are fit to the oil reservoir of carbon dioxide assisted steam flooding
According to oil field geologic feature and exploitation present situation, carry out the oil field coarse screening.The oil reservoir that is fit to the carbon dioxide assisted steam flooding meets the following conditions: oil reservoir is 1300m more deeply; Remaining oil saturation＞0.45, oil reservoir gross thickness＞10.0m, clean gross thickness ratio＞0.5, average oil reservoir degree of porosity＞0.20, coefficient of permeability variation＜0.7.
Well group is implemented in B, selection
In the oil reservoir that is fit to the carbon dioxide assisted steam flooding, determine to implement well group.Implement well group and satisfy between the straight well of implementing huff and puff oil recovery horizontal well drilling newly.The straight well of promptly implementing huff and puff oil recovery is 35m with the plan range of preparing new horizontal well drilling.
C, horizontal well drilling
Implementing to bore the water horizontal well between the straight well of steam oil production, the horizontal section length of horizontal well is 400m.The horizontal segment of horizontal well is in the straight well oil reservoir of huff and puff oil recovery.
D, the new horizontal well drilling of preheating
Carried out steam oil production 18 months at the new horizontal well that bores, handled up for 3 cycles, the oil reservoir around the new horizontal well drilling of preheating makes horizontal well and annotates that temperature raises 25 ℃ than oil reservoir original temperature between the vapour straight well.
The ground installation of E, carbon dioxide assisted steam flooding is installed
The notes vapour well of implementing the carbon dioxide assisted steam flooding is a straight well of implementing steam oil production; The producing well of implementing the carbon dioxide assisted steam flooding is new horizontal well drilling.The operating pressure of carbon dioxide injection pump is 20MPa, and 15 tons/hour of discharge capacities, the operating pressure of steam heating boiler are 18MPa, 20 tons/hour of discharge capacities.At new horizontal well drilling well head oil pumper and petroleum pipeline are installed.
F, steam in jection and carbon dioxide are implemented the carbon dioxide assisted steam flooding
In the straight well of implementing huff and puff oil recovery, mix continuously and inject pure carbon dioxide and steam.Carbon dioxide, steam inject with carbon dioxide injection pump group and steam heating boiler respectively.Well group steam injection speed is 1.3m
3/ d.ha.m (ha-hectare, unit of area, 1ha=10,000 square metre; The m-core intersection, rice); The shaft bottom steam quality is 30%, and the injection rate of carbon dioxide is 10 with the subsurface volume ratio of carbon dioxide and steam cold water equivalent.When implementing steam in jection and carbon dioxide, recover the oil continuously at new horizontal well drilling.
G, stop injecting carbon dioxide
When total injection rate of carbon dioxide reaches the 0.20PV of well group reservoir volume, stop injecting carbon dioxide, but continue steam in jection, recover the oil continuously at new horizontal well drilling.
Can reach production-injection ratio remains on more than 1.2.On the basis of steam soak, can improve recovery percent of reserves 30.5%, gas oil ratio can reach more than 0.20, adds the recovery percent of reserves in the stage of handling up, and overall recovery factor can reach 50.5%.
Key-drawing 4a and Fig. 4 b contrast help to understand the present invention.
Fig. 4 a is a carbon dioxide assisted steam flooding oil displacement process mechanism schematic diagram.Carbon dioxide and steam inject oil reservoir from injecting straight well 3 simultaneously.The steam that injects constantly heats the stratum around the pit shaft, and the carbon dioxide that injects constantly is dissolved in viscosity of crude is reduced, and the steam zone 5 that increases of the final continuous injection that forms with steam/carbon dioxide.Steam/carbon dioxide drops to the oil saturation in the steam zone 5 very low, but and with mobiloil exhaust steam band 5, be pulled in the vapour condensation zone 7 of steam zone 5 leading edge fronts.If crude oil has certain volatility, so, the part cut of residual oil can be evaporated in the gas phase in the steam zone 5, and is carried to steam-front by steam/carbon dioxide of being flowed, and there, these hydrocarbon steam are condensed and form a distillation band 6.After steam was met the cold oil condensation, carbon dioxide strode across the vapour condensation zone leading edge, met with crude oil in the cold oil band 9 there, formed carbon dioxide viscosity reduction band 8, had dwindled the volume of cold oil band 9.Indoor Physical Experiment shows, at pressure 5MPa, during 150 ℃ of temperature, carbon dioxide reaches 50% to the viscosity break ratio of common heavy oil.Like this, flowable crude oil is driven to horizontal well production well 4 under the effect of steam, carbon dioxide, hot water, produce by people's lifting again.
Fig. 4 b is traditional single steam injection displacement of reservoir oil process mechanism schematic diagram.It is simple steam flooding, lacks the booster action of carbon dioxide, does not therefore have carbon dioxide viscosity reduction band, and rate of oil production is low.
Claims (2)
1. method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving, it is characterized in that: the steam drive development deep-layer heavy crude reservoir that adopts auxiliary straight well of carbon dioxide and horizontal well combination, promptly adopt straight well to annotate vapour, the well pattern that new horizontal well drilling recovers the oil, injecting carbon dioxide gas in the straight well steam injection, carbon dioxide is 8～10 with steam cold water equivalent subsurface volume ratio, in steam in jection and carbon dioxide, recover the oil continuously at new horizontal well drilling, when the total injection rate of carbon dioxide is 0.1～0.3PV, stop injecting carbon dioxide, but the continuation steam in jection recovers the oil continuously at new horizontal well drilling.
2. method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving according to claim 1 is characterized in that:
A, selection are fit to the oil reservoir of carbon dioxide assisted steam flooding
The oil reservoir that is fit to the carbon dioxide assisted steam flooding meets the following conditions: oil reservoir is more deeply between 1300～1700m; Remaining oil saturation＞0.45, oil reservoir gross thickness＞10.0m, clean gross thickness ratio＞0.5, average oil reservoir degree of porosity＞0.20, coefficient of permeability variation＜0.7;
Well group is implemented in B, selection
Implementing well group should satisfy: new horizontal well drilling between the straight well of implementing huff and puff oil recovery, and the plan range of promptly having implemented the straight well of huff and puff oil recovery and the new horizontal well drilling of preparation is between 30～50m;
C, horizontal well drilling
Horizontal well drilling between the straight well of once implementing huff and puff oil recovery, the horizontal section length of horizontal well are between 200～500m, and the horizontal segment of horizontal well is in the straight well oil reservoir of huff and puff oil recovery;
D, the new horizontal well drilling of preheating
Carried out steam oil production 1～2 year at the new horizontal well that bores, handled up for 2～3 cycles, the oil reservoir around the new horizontal well drilling of preheating makes horizontal well and annotates that temperature raises 20～30 ℃ than oil reservoir original temperature between the vapour straight well;
The ground installation of E, carbon dioxide assisted steam flooding is installed
The notes vapour well of implementing the carbon dioxide assisted steam flooding is the straight well of once implementing steam oil production around the new horizontal well drilling; The producing well of implementing the carbon dioxide assisted steam flooding is new horizontal well drilling, at the straight well well head of implementing steam oil production carbon dioxide injection pump and steam heating boiler are installed, operating pressure 15～the 20MPa of carbon dioxide injection pump, 15 tons/hour of discharge capacities, operating pressure 15～the 18MPa of steam heating boiler, 20 tons/hour of discharge capacities are installed oil pumper and petroleum pipeline at new horizontal well drilling well head;
F, steam in jection and carbon dioxide are implemented the carbon dioxide assisted steam flooding
In the straight well of once implementing huff and puff oil recovery, inject pure carbon dioxide and steam continuously, carbon dioxide, steam inject with carbon dioxide injection pump group and steam heating boiler respectively, and well group steam injection speed is at 1.2～1.6m
3/ d.ha.m; The shaft bottom steam quality is 25～35%, and the injection rate of carbon dioxide is 8～10 with the subsurface volume ratio of carbon dioxide and steam cold water equivalent, in steam in jection and carbon dioxide, recovers the oil continuously at new horizontal well drilling;
G, stop injecting carbon dioxide
When total injection rate of carbon dioxide reaches 0.1～0.3PV of this well group reservoir volume, stop injecting carbon dioxide, but continue steam in jection, recover the oil continuously at new horizontal well drilling.
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| 刘尚奇等.超稠油油藏直井与水平井组合SAGD技术研究.石油勘探与开发34 2.2007,34(2),234-238. * |
| 张小波.蒸汽－二氧化碳－助剂吞吐开采技术研究.石油学报27 2.2006,27(2),80-84. |
| 张小波.蒸汽-二氧化碳-助剂吞吐开采技术研究.石油学报27 2.2006,27(2),80-84. * |
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