CN107893647A - A kind of method and system of air foam assisted steam flooding production of heavy oil reservoir - Google Patents
A kind of method and system of air foam assisted steam flooding production of heavy oil reservoir Download PDFInfo
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- CN107893647A CN107893647A CN201711181369.7A CN201711181369A CN107893647A CN 107893647 A CN107893647 A CN 107893647A CN 201711181369 A CN201711181369 A CN 201711181369A CN 107893647 A CN107893647 A CN 107893647A
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- steam
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- air foam
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
The present invention discloses a kind of method and system of air foam assisted steam flooding production of heavy oil reservoir, and the method for the air foam assisted steam flooding production of heavy oil reservoir includes：The suitable exploitation oil reservoir of screening；Determine to implement well group in the suitable exploitation oil reservoir；Air foam is injected to the steam injection well section plug of the implementation well group；To the steam injection well injection steam or injection air and steam of the implementation well group.The method and system of air foam assisted steam flooding production of heavy oil reservoir provided by the invention are applied to High water cut, the heavy crude reservoir transfer drive of serious heterogeneity, so as to reach the has channeling of closure high permeability formation, improve the purpose of recovery ratio.
Description
Technical field
The present invention relates to thickened oil recovery field, more particularly to a kind of air foam auxiliary steam in the Field Steam later stage
Drive the method and system of production of heavy oil reservoir.
Background technology
The mechanism driven refering to steam shown in Fig. 1, steam drive oil production are continuously high toward injection in oil reservoir from injection well
The steam of mass dryness fraction, steam constantly heated oil reservoir, so as to greatly reduce the viscosity of in-place oil.The steam of injection is in the earth formation
It is changed into the fluid of heat, crude oil is driven to around producing well, and is adopted onto ground.
The reserves of the suitable steam drive development in China have 4.5 hundred million tons, and by the exploitation of nearly 30 years, Xinjiang, Liaohe Heavy Crude note steamed
Vapour exploitation oil reservoir development all has been enter into the middle and later periods, because steam drive development can cause edge and bottom water invasion and thick oil pay steam condensate (SC)
A large amount of accumulations of body, increase development difficulty；Secondly, steam drives the very uneven of later stage reservoir producing, and top reservoir producing is good,
In, bottom oil layer employ difference or do not employ, continue steam and drive, invalid thermal cycle is serious；Furthermore middle and later periods thick oil steam drive is imitated
Rate is low, and plane steam, which drives, involves uneven phenomenon generally existing, and steam channeling is serious, and driving pressure declines to a great extent, and oil well output is anxious
Play is glided, and production cost rapid increase, economic benefit is substantially deteriorated, and low level is hovered in continuing along with current international oil price, right
The sustainable development of heavy crude heat extraction brings severe challenge, is badly in need of finding the side that more cost-effective steam drives middle and later periods heavy crude producing
Method, to realize the strong technical support of the continually and steadily offer of thick oil steam drive Efficient Development and yield.
Gas injection (such as carbon dioxide injection, natural gas or nitrogen) has proved to be a kind of efficient raising recovery efficiency technique,
But source of the gas deficiency be present and cost is high, its application is restricted, thus air injection technology is more and more paid attention to.
Air injection production of heavy oil reservoir is a creative raising recovery ratio new technology.Air source is wide, inexpensive, both may be used
In a manner of as secondary oil recovery, it can also be used to tertiary oil recovery.But for China most heterogeneous (middle and high infiltration interlayer) thin layer, nothing
For the acline at inclination angle, due to has channeling and viscous fingering, the oil displacement efficiency of simple air injection is restricted, and also leads to oxygen
Has channeling causes some potential safety hazards to oil well.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, inventor has found that using foam the gentle relative permeability of water can be reduced, and carries
High oil displacement efficiency and expansion swept volume, can increase substantially the recovery ratio of oil reservoir, therefore, air injection foam can give full play to bubble
Foam drives the advantages of driving two kinds of technologies with air, and cost is very low, and oil increasing effect is obvious, the High water cut that is particularly suitable for use in, serious heterogeneity
Heavy crude reservoir transfer drive, so as to reach the has channeling of closure high permeability formation, improve the purpose of recovery ratio.
The technical solution adopted by the present invention is：
A kind of method of air foam assisted steam flooding production of heavy oil reservoir, including：
The suitable exploitation oil reservoir of screening；
Determine to implement well group in the suitable exploitation oil reservoir；
Air foam is injected to the steam injection well section plug of the implementation well group；
To the steam injection well injection steam or injection air and steam of the implementation well group.
As a preferred embodiment, implementing the step to the implementation well group slug formula injection air foam
It is rapid and described to the implementation well group injection steam or while inject the step of air and steam, the production for implementing well group
Well keeps opening well and making production.
As a preferred embodiment, the steam injection rate of steam is 50-500t/d in steam injection well；Producing well produces
When drain age velocity be 1.2 times of the vapor (steam) velocity.
As a preferred embodiment, the steam be temperature between 200 DEG C -350 DEG C, bottom-hole steam quality >=
40%；The injection rate of the air foam is the ton day of 50 ton day -500.
As a preferred embodiment, the oil deposit parameter of the suitable exploitation oil reservoir is：Reservoir depth is in 200-
Between 1600m, remaining oil saturation>0.45, core intersection>5m, permeability grade<12, viscosity of crude<50000mPas, put down
Equal oil reservoir porosity>0.2, coefficient of permeability variation>0.7.
As a preferred embodiment, the implementation well group meets following condition：
The implementation well group drives flooding pattern using steam；And
The middle and later periods is produced in thick oil steam drive, implementation well group extraction crude oil water content reaches more than 98%.
As a preferred embodiment, also include：
Choose foaming agent；The condition that the foaming agent meets is：300 DEG C of heatproof；Resistance to salinity：>2000mg/L；Play foam
Product：>400ml；Half-life period>120min；And density of foaming agent 0.5%-1%.
As a preferred embodiment, the steam injection well section plug to the implementation well group injects air foam
Step includes：
Air foam slug will be formed in air and foaming agent solution injection well, until injection pressure reaches predetermined pressure.
A kind of system of air foam assisted steam flooding production of heavy oil reservoir, including：
Screening module, for screening suitable exploitation oil reservoir；
Determining module, for determining to implement well group in the suitable exploitation oil reservoir；
First injection module, for injecting air foam to the steam injection well section plug of the implementation well group；
Second injection module, for injecting steam or injection air and steam to the steam injection well of the implementation well group.
The method of the air foam assisted steam flooding production of heavy oil reservoir of the present invention can have the advantages that：
(1), profile control acts on：Rise in air foam combination flooding high permeability formation at initial stage oil production, moisture content declines, high permeability zone
Recovery ratio is also further enhanced, and with air foam oil displacement system, abundant, stable foam is formed in oil reservoir, closure is high
Infiltration layer, injection pressure are raised rapidly, and less permeable layer oil production is substantially increased, and moisture content is gradually increasing so that steam is driven on longitudinal direction
Gas entry profile is adjusted, channeling is reduced in plane, improves the sweep efficiency of steam, improve the fluid ability of crude oil.
(2) foam flooding effect, is emulsified：It is that water is wrapped in gas and forms foam flooding and replace crude oil that regular-type foam, which drives, viscous crude attaching
On pore wall, oil displacement efficiency is relatively low.The method of the air foam assisted steam flooding production of heavy oil reservoir aids in air foam
In steam-drive process, profit emulsifies, and in gas presence, forms oil-water emulsion foam, i.e. oil gas water three phase is mixed in intending
Phase state, both had the function that foam flooding expanded swept volume, it may have increase substantially the effect of oil displacement efficiency.
(3), gas drive acts on：After air foam slug, which drives, establishes certain injection pressure, turn air assisted steam flooding, crude oil
Oxidation occurs with air, discharges heat, improves the steam thermal efficiency, meanwhile, the flue gas (N of generation2And CO2), there is gas
Driving effect and increase stratum energy and raising driving force.
(4), air source is wide, not limited by regions；Non-environmental-pollution；Equipment occupation of land is small, and skid is easy, and cost is honest and clean
Valency；Not only there is general gas injection, and with other effects caused by oxidation.Air and foaming agent generation foam, have
High permeability zone is selectively entered, plays a part of turning to steam, expand steam swept volume.
With reference to following explanation and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, specifies the original of the present invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in scope.In appended power
In the range of the spirit and terms that profit requires, embodiments of the present invention include many changes, modifications and are equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
Used in individual other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those skilled in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the mechanism schematic diagram that existing steam drives；
Fig. 2 is the mechanism schematic diagram of the method for the air foam assisted steam flooding production of heavy oil reservoir of the present invention；
Fig. 3 is the method flow for the air foam assisted steam flooding production of heavy oil reservoir that one embodiment of the present invention provides
Figure；
Fig. 4 is the plane temperature field figure at the end of 45 pieces of brocade implements existing steam drive；
Fig. 5 is the plane temperature field figure at the end of 45 pieces of brocade implements air foam assisted steam flooding of the present invention；
Fig. 6 is the system signal for the air foam assisted steam flooding production of heavy oil reservoir that one embodiment of the present invention provides
Figure.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, below in conjunction with of the invention real
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example only part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained on the premise of creative work is not made, should all belong to guarantor of the present invention
The scope of shield.
It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more
The arbitrary and all combination of related Listed Items.
Fig. 2, Fig. 3 are referred to, the air foam assisted steam flooding heavy crude producing oil provided for one embodiment of the present invention
The method and step flow chart of Tibetan.In the present embodiment, the method for the air foam assisted steam flooding production of heavy oil reservoir includes
Following steps：
S1, the suitable exploitation oil reservoir of screening；
When carrying out the method for air foam assisted steam flooding production of heavy oil reservoir, it is necessary first to according to oil field geologic feature
And exploitation actuality, carry out oil field coarse sizing.The method of the air foam assisted steam flooding production of heavy oil reservoir is applied to steam injection
Channelling and the serious heavy crude reservoir of inter-well interference afterwards be present.
Specifically, the oil deposit parameter of the suitable exploitation oil reservoir is：Reservoir depth between 200-1600m, satisfy by remaining oil
And degree>0.45, core intersection>5m, permeability grade<12, viscosity of crude<50000mPas, average oil reservoir porosity>0.2,
Coefficient of permeability variation>0.7.
S2, determine to implement well group in the suitable exploitation oil reservoir；
In step S2, the condition that the implementation well group should meet is：The implementation well group drives flooding pattern using steam；With
And the middle and later periods is produced in thick oil steam drive, implementation well group extraction crude oil water content reaches more than 98%.
S3, the steam injection well section plug to the implementation well group inject air foam；
In this step, profit emulsifies in the presence of steam drive.In gas (water vapour, air) presence, shape
Into oil-water emulsion foam, i.e. oil gas water three phase had both had the function that foam flooding expanded swept volume, also had in mixed phase state is intended
The effect for the oil displacement efficiency that is improved largely.
Specifically, in step S3, the steam injection well section plug to the implementation well group injects the step of air foam
Suddenly include：Air foam slug will be formed in air and foaming agent solution injection well, until injection pressure reaches predetermined pressure.
During implementation steps S3, in steam injection well well head, first stop injecting water vapour into well, then by air foam injection well, formed
Foam blocking high permeability formation.
, can be according to laboratory experiment result and filed application experience, according to certain during air foam slug
Volume ratio injects air and foaming agent solution to form air foam in high permeability formation, so as to which high permeability formation be blocked, such as, formed empty
The air of gas foam and the volume ratio of foaming agent solution are 1:1., can be first defeated into steam injection well when forming air foam slug
Enter foaming agent (solution), according still further to 1:1 volume ratio input air.
The amount of injection air foam is to make injection pressure have untill lifting (to reach predetermined injection pressure).If the sky of injection
Gas foam amount is very few, then can not play and improve recovery ratio, slow down channeling effect between injection-production well；If air foam amount is excessive,
Then there is a possibility that the water vapour mass dryness fraction in shaft bottom can not ensure.
Specifically, can be according to different geological states and well group crude oil reserve come really for the total injection for injecting air foam
It is fixed.In the present embodiment, air foam can be injected into steam injection well within continuous 24 hours.The injection rate of air foam is 50
The ton day of ton day -500.
S4, the steam injection well to the implementation well group inject steam or injection air and steam.
Wherein, the air foam injected in the step S3 is formed in high-permeability pay and blocked so that in step S4
The steam and the air and steam of injection injected can be easily accessible middle low permeability pay so that under steam was driven in the later stage
Portion employ difference or or the reservoir do not employed realize and effectively employ.In step S4, to prevent water vapour from flowing back, it can note
Vapour well head is controlled using double-gate ball-and-seat.
In step S4, inject air and steam forms air assisted steam flooding.Now, crude oil aoxidizes with air
Effect, heat is discharged, improve the steam thermal efficiency, meanwhile, the flue gas (N of generation2And CO2), there is gas-powered effect and increase
Stratum energy and raising driving force.
The method of the air foam assisted steam flooding production of heavy oil reservoir of present embodiment can have below beneficial to effect
Fruit：
(1), profile control acts on：Rise in air foam combination flooding high permeability formation at initial stage oil production, moisture content declines, high permeability zone
Recovery ratio is also further enhanced, and with air foam oil displacement system, abundant, stable foam is formed in oil reservoir, closure is high
Infiltration layer, injection pressure are raised rapidly, and less permeable layer oil production is substantially increased, and moisture content is gradually increasing so that steam is driven on longitudinal direction
Gas entry profile is adjusted, channeling is reduced in plane, improves the sweep efficiency of steam, improve the fluid ability of crude oil.
(2) foam flooding effect, is emulsified：It is that water is wrapped in gas and forms foam flooding and replace crude oil that regular-type foam, which drives, viscous crude attaching
On pore wall, oil displacement efficiency is relatively low.The method of the air foam assisted steam flooding production of heavy oil reservoir aids in air foam
In steam-drive process, profit emulsifies, and in gas presence, forms oil-water emulsion foam, i.e. oil gas water three phase is mixed in intending
Phase state, both had the function that foam flooding expanded swept volume, it may have increase substantially the effect of oil displacement efficiency.
(3), gas drive acts on：After air foam slug, which drives, establishes certain injection pressure, turn air assisted steam flooding, crude oil
Oxidation occurs with air, discharges heat, improves the steam thermal efficiency, meanwhile, the flue gas (N of generation2And CO2), there is gas
Driving effect and increase stratum energy and raising driving force.
(4), air source is wide, not limited by regions；Non-environmental-pollution；Equipment occupation of land is small, and skid is easy, and cost is honest and clean
Valency；Not only there is general gas injection, and with other effects caused by oxidation.Air and foaming agent generation foam, have
High permeability zone is selectively entered, plays a part of turning to steam, expand steam swept volume.
Further, in the present embodiment, it is described to the implementation well in implementation to realize the continuous production of producing well
The step of group slug formula injection air foam and described the step of steam or injection air and steam are injected to the implementation well group
While, the producing well for implementing well group keeps opening well and making production.Specifically, the steam injection rate of steam is 50- in steam injection well
500t/d；Drain age velocity is 1.2 times of the vapor (steam) velocity when producing well produces.
To ensure the closure quality of air foam, the method for the air foam assisted steam flooding production of heavy oil reservoir also includes
Step：Choose foaming agent.
In the step of selection foaming agent, because the temperature of viscous crude subsurface deposit after steam drives can reach 230 DEG C
Above, it is necessary to resistant to elevated temperatures foaming agent.Based on the consideration, the condition that the foaming agent meets is：300 DEG C of heatproof；Resistance to salinity：
>2000mg/L；Foaming volume：>400ml；Half-life period>120min；And density of foaming agent 0.5%-1%.
Come below by the several embodiments for the method for implementing the air foam assisted steam flooding production of heavy oil reservoir detailed
The principle and effect of the application is described.
The oil reservoir that selection 45 pieces of steam of brocade drive implements the air foam assisted steam flooding production of heavy oil reservoir of present embodiment
Method.
930~l020m of buried depth of bright and beautiful 45 pieces of steam drive reservoirs, average pore 24.5%, permeability 1739mD, belongs to high hole
Hypertonic reservoir.Degassed crude viscosity 13000mPas under reservoir temperature, effective pay thickiness 26.3m, effecive porosity
24.5%, net gross thickness ratio is 0.43, and it is 0.55 to turn oil saturation before driving, and permeability variation parameter is 0.81.
Comparison diagram 4, Fig. 5 can be seen that bright and beautiful 45 pieces of heavy crude reservoirs using present embodiment carry out exploitation can obtain it is following
Effect：
1), the raising steam of the more amplitude of method energy of the air foam assisted steam flooding production of heavy oil reservoir involves body
Product.The swept volume of bright and beautiful 45 Reservoir With Steam oil reservoirs in the vertical is 48%, and the swept volume of air foam assisted steam flooding
Reach 76%, swept volume improves 28%；
2), air foam assisted steam flooding (method of air foam assisted steam flooding production of heavy oil reservoir) can be improved and adopted
Yield and gas oil ratio.For 45 pieces of brocade, recovery ratio improves 9%-11.9%, and gas oil ratio improves 27.4%-39.4%.
The oil reservoir for selecting the neat 40 pieces of steam in the Liaohe River to drive implements the air foam assisted steam flooding heavy crude producing of present embodiment
The method of oil reservoir.
Wherein, 625~1050 meters of the reservoir buried depth of the neat 40 pieces of steam drive reservoirs in the Liaohe River, lotus flower oil reservoir core analysis porosity
Average 31.5%, permeability is average 2.062 μm2, belong to high hole, hypertonic reservoir.Oil reservoir average effective caliper 37.7m, net/total thickness
Degree is than being 0.53, original formation pressure 8.5MPa, 36.8 DEG C of reservoir temperature, and degassed crude viscosity is under reservoir temperature
7140mPaS, neat 40 pieces are mid-deep strata, middle thick mutually stratiform common heavy oil reservoir, and permeability variation parameter is 0.72, when turning to drive
Oil saturation is 52%.
Gas oil ratio improves more than 20% after neat 40 pieces of heavy crude reservoirs implement air foam assisted steam flooding development scheme, harvesting
Rate improves 8-10%.On the basis of steam drive, recovery percent of reserves 41.3% can be improved, gas oil ratio can reach 0.307, plus steam
The recovery percent of reserves in drive stage, overall recovery factor can reach 60.0%.
The oil reservoir for selecting the area's steam of Xinjiang 96 to drive implements the air foam assisted steam flooding heavy crude producing oil of present embodiment
The method of Tibetan.
The area of Xinjiang 96 shares 98 vapour and drives well groups, 80,000,000 tons of reserves, to the end of the year 2014, year 55.54 ten thousand tons of oil-producing, oil
Vapour is than 0.09, buried depth 450m in the middle part of oil reservoir, recovery percent of reserves 42.0%, oil reservoir average pore 29.8%, and reservoir permeability 455~
5000mD, average 2680mD, oil saturation 74.6%, belongs to high hole, hypertonic reservoir.The area's core intersection 0 of Xinjiang 9 6~
42.0m, average 17.5m；Deaerate the average 23670mPas of oil viscosity at 20 DEG C, belongs to extra-viscous oil reservoir；Core intersection：Averagely have
Imitate thickness 13.5m, permeability：2292mD, viscosity of crude (50 DEG C)：Average 2945mPas.Recovery percent of reserves：36%, it is oily at present
Vapour ratio：0.09, in the steam injection development later stage, show that recovery percent of reserves is high, the aqueous high, spy that oil production is low, gas oil ratio is low
Point.
The area's heavy crude reservoir gas oil ratio under the development scheme of Xinjiang 96 can improve more than 20%, recovery ratio can improve 9% with
On, on the basis of steam drive, cumulative oil recovery factor can reach more than 65%.
Referring to Fig. 6, the air foam assisted steam flooding production of heavy oil reservoir provided for the application another embodiment
System, the system of the air foam assisted steam flooding production of heavy oil reservoir includes：Screening module, for screening suitable exploitation oil
Hide；Determining module, for determining to implement well group in the suitable exploitation oil reservoir；First injection module, for the implementation
The steam injection well section plug injection air foam of well group；Second injection module, steamed for being injected to the steam injection well of the implementation well group
Vapour or injection air and steam.The system of the air foam assisted steam flooding production of heavy oil reservoir of the embodiment may be referred to
The record of the method for air foam assisted steam flooding production of heavy oil reservoir is stated, is no longer repeated one by one herein.
Herein cited any digital value all include between lower limit to higher limit with the lower value of an incremented and
The all values of upper value, the interval of at least two units between any lower value and any much higher value be present.For example, such as
Fruit elaborates that the quantity of part or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20
To 80, more preferably from 30 to 70, then purpose is to illustrate that such as 15 to 85,22 are also clearly listed in the specification arrives
68th, 43 to 51,30 to 32 is equivalent.For the value less than 1, it is 0.0001,0.001,0.01,0.1 suitably to think a unit.
These are only intended to the example clearly expressed, it is believed that the numerical value enumerated between minimum and peak is possible to
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all scopes all include all numerals between end points and end points.It is used together with scope
" about " or " approximation " be suitable for two end points of the scope.Thus, " about 20 to 30 " are intended to covering " about 20 to about
30 ", including at least the end points indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describe the term " substantially by ... forms " of combination should include determined by element, composition, part or step and reality
Other elements, composition, part or the step of the basic novel feature of the combination are not influenceed in matter.Using term "comprising" or
" comprising " describes the combination of element here, composition, part or step it is also contemplated that substantially by these elements, composition, part
Or the embodiment that step is formed.Here by using term " can with ", it is intended to which illustrate that " can with " include is described any
Attribute is all optional.
Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.It is alternative
Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for
The open "a" or "an" for describing element, composition, part or step is not said to exclude other elements, composition, part
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
State, many embodiments and many applications outside the example provided all will be aobvious and easy for a person skilled in the art
See.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should with reference to appended claims and this
The four corner of the equivalent that a little claims are possessed determines.It is for comprehensive purpose, all articles and special with reference to including
The disclosure of profit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as inventor the theme is not thought of as it is disclosed
A part for subject matter.
Claims (9)
- A kind of 1. method of air foam assisted steam flooding production of heavy oil reservoir, it is characterised in that including：The suitable exploitation oil reservoir of screening；Determine to implement well group in the suitable exploitation oil reservoir；Air foam is injected to the steam injection well section plug of the implementation well group；To the steam injection well injection steam or injection air and steam of the implementation well group.
- 2. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that implementing It is described to described the step of implementing well group slug formula injection air foam and described to the implementation well group injection steam or injection While the step of air and steam, the producing well for implementing well group keeps opening well and making production.
- 3. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that in steam injection The steam injection rate of steam is 50-500t/d in well；Drain age velocity is 1.2 times of the vapor (steam) velocity when producing well produces.
- 4. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that the steaming Vapour be temperature between 200 DEG C -350 DEG C, bottom-hole steam quality >=40%；The injection rate of the air foam be 50 ton days- 500 ton days.
- 5. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that the conjunction The oil deposit parameter of suitable exploitation oil reservoir is：Reservoir depth is between 200-1600m, remaining oil saturation>0.45, core intersection>5m, Permeability grade<12, viscosity of crude<50000mPas, average oil reservoir porosity>0.2, coefficient of permeability variation>0.7.
- 6. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that the reality Apply well group and meet following condition：The implementation well group drives flooding pattern using steam；AndThe middle and later periods is produced in thick oil steam drive, implementation well group extraction crude oil water content reaches more than 98%.
- 7. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that also wrap Include：Choose foaming agent；The condition that the foaming agent meets is：300 DEG C of heatproof；Resistance to salinity：>2000mg/L；Foaming volume：> 400ml；Half-life period>120min；And density of foaming agent 0.5%-1%.
- 8. the method for air foam assisted steam flooding production of heavy oil reservoir as claimed in claim 1, it is characterised in that described right The step of steam injection well section plug for implementing well group injects air foam includes：Air foam slug will be formed in air and foaming agent solution injection well, until injection pressure reaches predetermined pressure.
- A kind of 9. system of air foam assisted steam flooding production of heavy oil reservoir, it is characterised in that including：Screening module, for screening suitable exploitation oil reservoir；Determining module, for determining to implement well group in the suitable exploitation oil reservoir；First injection module, for injecting air foam to the steam injection well section plug of the implementation well group；Second injection module, for injecting steam or injection air and steam to the steam injection well of the implementation well group.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711181369.7A CN107893647A (en) | 2017-11-23 | 2017-11-23 | A kind of method and system of air foam assisted steam flooding production of heavy oil reservoir |
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| CN201711181369.7A CN107893647A (en) | 2017-11-23 | 2017-11-23 | A kind of method and system of air foam assisted steam flooding production of heavy oil reservoir |
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| CN107893647A true CN107893647A (en) | 2018-04-10 |
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Application publication date: 20180410 |