CN107916916A - Improve the method and device of foam oil development effectiveness - Google Patents
Improve the method and device of foam oil development effectiveness Download PDFInfo
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- CN107916916A CN107916916A CN201710990460.7A CN201710990460A CN107916916A CN 107916916 A CN107916916 A CN 107916916A CN 201710990460 A CN201710990460 A CN 201710990460A CN 107916916 A CN107916916 A CN 107916916A
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- well
- steam injection
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- horizontal well
- injection pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
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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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
Abstract
The invention discloses a kind of method and device for improving foam oil development effectiveness, this method includes：The production information of two neighboring dual horizontal well well pair is obtained, identifies the production feature of each well pair；After the oil production of two dual horizontal well wells peaks, compare the recovery features of two dual horizontal wells pair, using dual horizontal well well of the vapor chamber development degree with respect to higher to as high pressure steam injection well, injecting the first steam injection pressure；Using another dual horizontal well well to as low pressure steam injection well, injecting the second steam injection pressure；The steam injection pressure difference is maintained to carry out first scheduled time of steam injection, after the vapor chamber of two dual horizontal well wells pair connects, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection；After being spaced for second scheduled time, steam injection pressure of the two dual horizontal well wells of conversion to steam injection well；After repeating above-mentioned second scheduled time of interval, steam injection pressure of two dual horizontal well wells to steam injection well is changed, until end-of-development.The present invention improves foam oil development effectiveness.
Description
Technical field
The present invention relates to technical field of petroleum extraction, more particularly to a kind of method and dress for improving foam oil development effectiveness
Put.
Background technology
The description of this part only provide with the relevant background information of disclosure, without form the prior art.
Crude oil in foam oil type extra heavy oil reservoirs has high relative density, high viscosity, high asphaltenes, height containing a huge sum of money
Belong to, higher primary Korean pine forest, underground is cold adopt during can form foam oil stream." foam oil " is that heavy oil reservoirs are once declining
Exhaust the scattered gas-liquid two-phase occurred in recovery process and move phenomenon.Due to foam oil type extra heavy oil reservoirs primary Korean pine forest
Height, underground crude oil can form foam oil stream.Specifically, " foam oil " is that extra heavy oil reservoirs are local in an exhaustion recovery process
Stressor layer drops to after solution gas after bubble point pressure is deviate from from oil phase not to be separated from crude oil at once, but with micro-
The phenomenon that the form of minute bubbles flows together with crude oil.
It is general to adopt exploitation side using cluster horizontal well natural energy is cold for the block for containing foam oil type extra heavy oil reservoirs
Formula is exploited.Since foam oil type extra heavy oil has certain mobility, mode is adopted using cluster horizontal well natural energy is cold
Exploitation, after strata pressure drops to bubble point pressure, produces foam oil stream, production gas-oil ratio slowly rises at this time, and strata pressure delays
It is slow to decline, there is higher primiparity and primary recovery rate.With stratum energy exhaustion and production decline, but the later stage is adopted in foam oil cooling
The problem of facing productivity substitution and further improving oil recovery rate.
SAGD (steam assisted gravity drainage) technology is a kind of effective raising extra heavy oil and oil-sand rate of oil production and harvesting
The heat extraction by steam injection technology of rate.For foam oil type extra heavy oil, dual horizontal well SAGD can make full use of existing foam grease
Horizontal well is cold to adopt well pattern, be it is a kind of effectively take over the cold heat extraction by steam injection technology for adopting exploitation of horizontal well, opened in exhaustion of foam oil
Recovery ratio 20-30% can be further improved on the basis of adopting.
Since foam oil type extra heavy oil has higher primary Korean pine forest, during SAGD is implemented, reservoir temperature
Rise, solubility of the solution gas in crude oil reduce, and substantial amounts of solution gas can be deviate from crude oil, and the solution gas of abjection is steamed in injection
It can be gathered under the driving of vapour on the wall of vapor chamber.Solution gas belongs to non-condensation gas at the same time, has preferable heat-blocking action,
Heat transfer of the steam to oil phase can be hindered, weakens heat effect of the steam to crude oil, limitation SAGD vapor chamber extensions, have impact on
SAGD development effectiveness.
The influence developed for foam oil type extra heavy oil solution gas to SAGD, it is necessary to which research improves foam oil development effectiveness
Method.But there is presently no the research of this respect method.
The content of the invention
The object of the present invention is to provide a kind of method and device for improving foam oil development effectiveness, the prior art can be overcome
The defects of, improve foam oil development effectiveness.
The above-mentioned purpose of the present invention can be realized using following technical proposal：
A kind of method for improving foam oil development effectiveness, foam oil oil reservoir to be exploited include multiple dual horizontal well wells pair,
The described method includes：
The production information of two neighboring dual horizontal well well pair is obtained, the production of each well pair is identified based on the production information
Feature；Wherein, the production feature includes：Oil production and steam oil ratio (SOR)；
After the production information represents that the oil production of two dual horizontal well wells peaks, compare two dual horizontal wells
To recovery features, using development effectiveness is relatively more preferable, vapor chamber development degree with respect to higher dual horizontal well well to as high pressure
Steam injection well, injects the first steam injection pressure；Using another dual horizontal well well to as low pressure steam injection well, injecting the second steam injection pressure；
First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure difference；
The steam injection pressure difference is maintained to carry out first scheduled time of steam injection, when the vapor chamber connection of two dual horizontal well wells pair
Afterwards, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection；
After being spaced for second scheduled time, steam injection pressure of the two dual horizontal well wells of conversion to steam injection well；
After repeating above-mentioned second scheduled time of interval, steam injection pressure of two dual horizontal well wells to steam injection well is changed, until
End-of-development.
In one preferred embodiment, first steam injection pressure is 3.4 megapascal, and second steam injection pressure is
2.0 megapascal.
In one preferred embodiment, after the steam injection pressure difference for reducing by two dual horizontal well wells pair, described first
Steam injection pressure is 2.8 megapascal, and second steam injection pressure is 2.0 megapascal.
In one preferred embodiment, any one dual horizontal well well to including：First level well and the second level
Well, the first level well location is in the lower section predetermined distance range of second horizontal well, and the first level well spacing is from oil
The distance of layer bottom is between 1 meter to 5 meters, and second horizontal well is located above position among oil reservoir.
In one preferred embodiment, the preset distance is 8 meters to 15 meters.
In one preferred embodiment, there is the first level well first horizontal segment, second horizontal well to have
There is the second horizontal segment, the extending direction of the first horizontal segment and the second horizontal segment keeps horizontal, and first, second horizontal well is equal
Using thermal recovery mode completion.
In one preferred embodiment, the method further includes：
By the first level well set in oil reservoir bottom, declined using the native abilities of the foam oil oil reservoir
Exhaust exploitation；When strata pressure is reduced to preset pressure, second horizontal well is set in oil reservoir middle and upper part, switchs to SAGD lifes
Production.
In one preferred embodiment, the preset pressure is 2 megapascal.
In one preferred embodiment, it is described when strata pressure is reduced to preset pressure, switch to SAGD production bags
Include：Using second horizontal well as the direct steam injection of steam injection well, and producing well is used as by the first level well and is directly carried out
Production.
A kind of device for improving foam oil development effectiveness, including：
Feature recognition module is produced, for obtaining the production information of two neighboring dual horizontal well well pair, based on the production
Information identifies the production feature of each well pair；Wherein, the production feature includes：Oil production and steam oil ratio (SOR)；
Predetermined steam injection pressure difference setup module, the oil production for representing two dual horizontal well wells when the production information reach
To after peak, compare the recovery features of two dual horizontal wells pair, by development effectiveness is relatively more preferable, vapor chamber development degree relatively more
High dual horizontal well well is to as high pressure steam injection well, injecting the first steam injection pressure；Using another dual horizontal well well to as low pressure
Steam injection well, injects the second steam injection pressure；First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure
Difference；
Pressure difference adjusts module, for maintaining the steam injection pressure difference to carry out first scheduled time of steam injection, when two dual horizontal wells
After the vapor chamber connection of well pair, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection；
Pressure difference modular converter, after being spaced for second scheduled time, steam injection of the two dual horizontal well wells of conversion to steam injection well
Pressure；
Loop module, after repeating above-mentioned second scheduled time of interval, two dual horizontal well wells of conversion are to steam injection well
Steam injection pressure, until end-of-development.
The features and advantages of the invention are：There is provided in embodiment of the present invention improvement foam oil development effectiveness method and
Device, certain pressure differential is kept by adjacent SAGD well pair steam injection well steam injection pressure, can be incited somebody to action under steam injection pressure differential
A part of solution gas is discharged from vapor chamber, reduces the adverse effect that solution gas develops SAGD.Meanwhile steam injection pressure difference can be more
Well by the mother oil displacement among two neighboring SAGD well pair, increase recovery ratio.Further, two SAGD well pair alternate changes
Steam injection pressure, can more increase involve scope of the steam to crude oil, further increase recovery ratio.Therefore, the present invention can
Improve foam oil development effectiveness.
Brief description of the drawings
Fig. 1 is a kind of step flow chart for the method for improving foam oil development effectiveness in the application embodiment；
Fig. 2 a use balanced steam injection remaining oil distribution schematic diagram for one kind；
Fig. 2 b use unbalanced steam injection remaining oil distribution schematic diagram to be a kind of；
Fig. 2 c are to be a kind of using unbalanced alternately steam injection remaining oil distribution schematic diagram；
Fig. 3 is a kind of module map for improving foam oil development effectiveness device in the application embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, elaborate to technical scheme, it should be understood that these
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention, after the present invention has been read, this area skill
Modification of the art personnel to the various equivalent forms of the present invention is each fallen within the application appended claims limited range.
The method and device of improvement foam oil development effectiveness described herein is carried out specifically below in conjunction with the accompanying drawings
It is bright.Fig. 1 is the flow chart of the method for the improvement foam oil development effectiveness that one embodiment of the application provides.Although the application carries
Supplied such as following embodiments or method operating procedure shown in the drawings, but based on it is conventional or without performing creative labour in institute
More or less operating procedures can be included by stating in method.In the step of necessary causality is not present in logicality,
The execution sequence of these steps is not limited to the execution sequence of the application embodiment offer.
Unless otherwise defined, all of technologies and scientific terms used here by the article and the technical field of the application is belonged to
The normally understood implication of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.
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 ", " on ",
" under ", "left", "right" and similar statement for illustrative purposes only, it is unique embodiment to be not offered as.
The present invention provides a kind of method for improving foam oil development effectiveness, the defects of can overcoming in the prior art, improves
Foam oil development effectiveness.
Process Crude Oil is adopted since foam oil type extra heavy oil horizontal well is cold by gravity to oil reservoir flowing underneath, horizontal well
The cold well location adopted is usually close to the position of oil reservoir bottom.Traditional, foam oil cooling turns SAGD and takes over exploitation after adopting, be
Drill with ferrule a bite steam injection well implements SAGD productions on original horizontal well producing well.Because later stage strata pressure drop is adopted in foam oil cooling
Low, solution gas is deviate from from crude oil, the solution gas deviate under oil gas gravitational differentiation can be gathered in oil reservoir top formed it is secondary
Pneumatic jack, turns SAGD exploitations at this time, and solution gas can influence SAGD development effectiveness to influencing steam to the heat effect of crude oil.This Shen
A kind of method for improving foam oil development effectiveness please be propose, the improvement foam oil exploitation after being based on directly on that dual horizontal well is cold and adopting
The method of effect.That is, a kind of method of improvement foam oil development effectiveness provided herein is mainly for waiting to exploit
Foam oil oil reservoir includes the situation of multiple dual horizontal well wells pair.
In the present embodiment, before the method for the improvement foam oil development effectiveness provided using the application, can first obtain
The oil deposit parameter of foam type extra heavy oil to be exploited is taken, when the oil deposit parameter meets that SAGD exploitations require, performs following step：
Wait carrying out drilling well along after the depth of vertical definite first level well and the second horizontal well in exploiting foam type extra heavy oil oil reservoir,
And completion is carried out to the first level well and the second horizontal well using thermal recovery mode；Wherein, the first level well location is in institute
State in the lower section predetermined distance range of the second horizontal well, the first level well spacing is more than 1 meter with a distance from oil reservoir bottom；Will
The first level well and the second horizontal well are carried out at the same time blowdown as producing well；Obtain the foam type extra heavy oil oil
Layer strata pressure, when the strata pressure exhaustion is to preset pressure the cold phase of adopting terminate, will second horizontal well as note
Vapour well；Direct steam injection, and producing well is used as by the first level well and is directly produced.
Specifically, it is adapted to the geology reservoir that SAGD exploitations require to include：Core intersection, oil reservoir spread and crude oil
Characteristic etc..For example, reservoir buried depth is less than 1000 meters (m), reservoir thickness is more than 20m, and the net gross thickness ratio of oil reservoir is more than 0.5, infiltration
Rate is more than 500mD, and porosity is more than 0.2, and oil saturation is more than 0.5.
In the present embodiment, water can be respectively bored up and down at the middle part of foam oil type extra heavy oil oil reservoir and bottom first
Flat producing well, two mouthfuls of water horizontal wells use thermal recovery mode completion.Wherein, second horizontal well is located at the centre of the core intersection
The middle and upper part of above position, i.e. oil reservoir；Following first level well is set close to oil reservoir bottom, is more than away from oil reservoir distance from bottom
1m。
Then, it is carried out at the same time exhaustion (cold to adopt) formula using upper and lower two mouthfuls of water horizontal wells and develops to the cold phase of adopting and terminates.Exploiting
In journey can in real time or foam type extra heavy oil oil reservoir described in timing acquisition strata pressure.When the strata pressure exhaustion is to pre-
If the cold phase of adopting terminates during pressure, at this time, second horizontal well is replaced with into steam injection well, so as to switch to SAGD by the exploitation of exhaustion formula
Production.
Wherein, the preset pressure can be 2 megapascal (MPa).Oil reservoir original formation pressure is 8MPa, utilizes native abilities
Exhaustion exploitation (cold to adopt) to strata pressure be 2MPa, then terminate it is cold adopt preparation turn SAGD produce.The water under 2MPa strata pressures
The cold well yield adopted of horizontal well has basically reached Single Well Economic production rate limit, takes full advantage of stratum energy During Natural Depletion, cold to adopt
Recovery percent of reserves is high.Turn during SAGD that strata pressure is lower at the same time, the solution gas deviate from from oil phase is more, remains in molten in oil phase
Vent one's spleen fewer, this solution gas belongs to non-condensation gas, hinders heat transfer in SAGD exploitations, influences vapor chamber development, therefore
It is cold to adopt to strata pressure that to turn SAGD when being 2MPa be best opportunity.
When it is cold adopt the phase after, by the flow string of the second horizontal well of top, oil recovery mechanism include pump etc. take out, tripping in
Steam injection string switchs to SAGD steam injection wells.The first level well of lower section does not do the producing well for becoming and being turned to SAGD.
Finally, the well of SAGD is switched to coming into effect SAGD.Wherein, it is different from conventional SAGD, foam oil type extra heavy oil
SAGD need not be preheated, and the direct steam injection of steam injection well of top, the producing well of lower section directly produces.
General SAGD production processes are divided into：Start warm-up phase and production phase.It is to pass through steam injection to start warm-up phase
Well and producing well thermal cycle are completed, and main target is the high viscosity oil between steam injection well and producing well is formed thermal communication, tool
There is mobility.Foam oil type extra heavy oil is cold to adopt the later stage, as strata pressure declines, viscosity of crude rise, but still there is a constant current
Dynamic property.Applicant is contrasted by numerical simulation to implement SAGD and does not preheat, preheats 5 days and preheat 30 days, in the case of these three
SGAD exploitation effects are found：In the case of above-mentioned three kinds, it is essentially identical that SAGD tires out yield, in the case of not implementing preheating, adds up oil
Vapour is than highest, therefore for foam oil extra heavy oil SAGD, using not implementing to start preheating, it is cold adopt the phase after be directly entered SAGD
Production phase, so as to improve the development effectiveness of foam oil type extra heavy oil.
In one embodiment, the vertical well between the first level well and second horizontal well is away from can be
Between 8m-15m.In the present embodiment, the vertical distance of SAGD injection-production wells is one of important parameter for controlling draining pressure difference, rationally
Vertical well spacing be conducive to liquid-vaqor interface regulation and control and vapor chamber development.For the super-heavy oil deposit that can not be flowed under formation condition and
Oil-sand, the conventional vertical well spacings of dual horizontal well SAGD generally use 3-5m.And for foam oil type extra heavy oil, due to crude oil under stratum
With mobility, during SAGD steam injection well steam injections, steam one side heating in crude oil, on the other hand can also drive crude oil flow direction production
Well.The vertical well spacing of injection-production well is smaller, and SAGD operation oil production at initial stage is higher, this is because vertical well spacing is small, the injection of steam injection well
Steam can act on the oil reservoir between steam injection well and producing well at first, and thermal communication forms morning, and steam drive effect and gravity are let out
So that producing pressure differential is high between injection-production well, SAGD initial productions are high for oil effect.With the increase of the vertical well spacing of injection-production well, steam injection well spacing
Nearer from the interlayer or cap rock of top of oil horizon, heat loss is more.
Consider SAGD recoverys percent of reserves, investment payback time and heat loss, the vertical injector producer distance of foam oil type extra heavy oil should
This suitably increases, and producing well should be deployed in oil reservoir middle and upper part close to oil reservoir bottom, horizontal steam injection well.By taking the oil reservoir of 20m thickness as an example,
Horizontal well steam injection well and the vertical distance of horizontal production well are preferably 15m.
In one embodiment, the first level well with first horizontal segment, second horizontal well with second
The extending direction of horizontal segment, the first horizontal segment and the second horizontal segment keeps horizontal.
Applicants have found that：Even in exploitation block structurally have certain angle stratigraphic dip, horizontal well side
To remaining under level condition, SAGD development effectiveness is more preferable.
Referring to Fig. 1, a kind of method of the improvement foam oil development effectiveness provided in the application embodiment can include
Following steps：
Step S10：The production information of two neighboring dual horizontal well well pair is obtained, each well is identified based on the production information
To production feature；Wherein, the production feature includes：Oil production and steam oil ratio (SOR)；
Step S12：After the production information represents that the oil production of two dual horizontal well wells peaks, compare two
The recovery features of dual horizontal well pair, by development effectiveness is relatively more preferable, vapor chamber development degree with respect to higher dual horizontal well well pair
As high pressure steam injection well, the first steam injection pressure is injected；Using another dual horizontal well well to as low pressure steam injection well, injecting the second note
Steam pressure；First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure difference；
Step S14：The steam injection pressure difference is maintained to carry out first scheduled time of steam injection, when the steam of two dual horizontal well wells pair
After chamber connection, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection；
Step S16：After being spaced for second scheduled time, steam injection pressure of the two dual horizontal well wells of conversion to steam injection well；
Step S18：After repeating above-mentioned second scheduled time of interval, steam injection pressure of the two dual horizontal well wells of conversion to steam injection well
Power, until end-of-development.
In the present embodiment, can be by obtaining the production information of two neighboring dual horizontal well well pair, based on the life
Production information identifies the production feature of each well pair.Wherein, the production feature can include：Oil production and steam oil ratio (SOR).Oil-producing
Amount is higher, steam oil ratio (SOR) is lower represents that development effectiveness is relatively preferable, and vapor chamber development degree is with respect to higher.
SAGD exploitations are generally divided into three phases：
1) oil production ascent stage, the stage correspond to vapor chamber stage of development upward；
2) the oil production stabilization sub stage, it is extending transversely to starting behind top of oil horizon which corresponds to vapor chamber development；
3) oil production depletion stage, which, which corresponds to after vapor chamber expands to border, starts to extend downwards.
Implement the steam injection well of two neighboring dual horizontal well (hereinafter abbreviation SAGD) well pair during the first stage of SAGD
Steam injection pressure is consistent, and steam injection pressure can be 2.8MPa.When the production information represents the production of two dual horizontal well wells
After oil mass peaks, oil production generally can gradually successively decrease.In order to improve foam oil development effectiveness, uneven note can be used
Vapour, can promote vapor chamber to develop, so as to improve recovery percent of reserves.
Specifically, the recovery features of two dual horizontal wells pair can be compared, by development effectiveness is relatively more preferable, vapor chamber is developed
Degree with respect to higher dual horizontal well well to as high pressure steam injection well, injecting the first steam injection pressure；Select this dual horizontal well well pair
As high pressure steam injection well to being conducive to the development of vapor chamber.Using another dual horizontal well well to as low pressure steam injection well, injection the
Two steam injection pressures；First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure difference.Wherein, described
One steam injection pressure can be 3.4MPa, and second steam injection pressure can be 2.0MPa.The predetermined steam injection pressure formed between the two
Difference is 1.4MPa.
The steam injection pressure difference is maintained to carry out first scheduled time of steam injection, when the vapor chamber connection of two dual horizontal well wells pair
Afterwards, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection.
Specifically, when first steam injection pressure is 3.4MPa, when second steam injection pressure is 2.0MPa, two SAGD
The pressure difference of well pair keeps 1.4MPa for a period of time, treats to reduce after the vapor chamber connection of two SAGD well pairs two SAGD well pairs
Steam injection pressure difference.It is two SAGD well pair vapor chamber connections when the steam injection amount of low pressure SAGD well pair steam injection well reduces suddenly
At the moment, can be reduced to 2.8MPa by the steam injection pressure of high pressure SAGD well pair steam injection well at this moment and continue to implement unbalanced steam injection one
Nian Hou, changes the steam injection pressure of two SAGD well pair steam injection wells.High pressure steam injection well before is changed into low pressure steam injection well, steam injection pressure
For 2MPa；Low pressure steam injection well before is changed into high pressure steam injection well, steam injection pressure 2.8MPa.Implement not according to this steam injection pressure difference
Balanced steam injection changes the steam injection pressure of two SAGD well pairs again after 1 year, until SAGD end-of-developments.
The remaining oil distribution schematic diagram obtained incorporated by reference to Fig. 2 a, Fig. 2 b, Fig. 2 c difference steam injection modes, illustrates that the application is carried
The effect that the method for the improvement foam oil development effectiveness of confession can reach.Wherein, Fig. 2 a are a kind of remaining using balanced steam injection
Oil distribution schematic diagram；Fig. 2 b use unbalanced steam injection remaining oil distribution schematic diagram to be a kind of；Fig. 2 c use unbalanced friendship to be a kind of
For steam injection remaining oil distribution schematic diagram.On the whole as can be seen that remaining oil has reduced half when using uneven steam injection
More than, when further using unbalanced alternately steam injection, most remaining oils can be plucked out of, and substantially improve exploitation effect
Fruit.
In the application embodiment, improve the method for foam oil development effectiveness mainly by unbalanced steam injection, realize
Improvement more wells are to SAGD development effectiveness.Specifically, it is main to SAGD development effectiveness to improve more wells by unbalanced steam injection
There are two reasons：First, there are pressure differential between two SAGD well pairs, so as to the precipitation solution gas that will be retained in vapor chamber
Discharge；Second, steam flooding is one of mechanism of oil displacement of foam oil type extra heavy oil SAGD, more wells note SAGD during unbalanced steam injection
Steam pressure, so as to which the crude oil between SAGD well pair is driven onto adjacent well to producing well, improves vapor chamber hair there are pressure difference
Degree and reserves exploitation degree are educated, so as to improve SAGD recoverys percent of reserves.
In addition, alternately uneven steam injection, both combinations are combined on the basis of uneven steam injection to be further improved
SAGD stage recoverys percent of reserves.Specific reason is as follows：Implement in unbalanced steam injection process, the steam injection pressure of a SAGD well pair steam injection well
Power is consistently higher than offset well to SAGD steam injection pressures, and heat transfer and driving force of the vapor action in high this side of steam injection pressure are more,
Cause the uneven of two SAGD well pair reserves exploitation degree.Unbalanced steam injection can effectively employ the residue between two wells pair
Oil, increases substantially foam oil SAGD stage recoverys percent of reserves；And alternately unbalanced steam injection can be with the basis of unbalanced steam injection
Model boundary reserves exploitation degree is significantly increased, increases SAGD stage recoverys percent of reserves.
In conclusion the present invention provides a kind of uneven steam injection that replaces to improve the method for foam oil SAGD development effectiveness,
It is an advantage of the invention that：Adjacent SAGD well pair steam injection well steam injection pressure keeps certain pressure differential, under steam injection pressure differential
A part of solution gas can be discharged from vapor chamber, reduce the adverse effect that solution gas develops SAGD.Meanwhile steam injection pressure difference
Recovery ratio can be increased preferably by the mother oil displacement among two neighboring SAGD well pair.Further, two SAGD well pairs are handed over
For steam injection pressure is changed, it can more increase involve scope of the steam to crude oil, further increase recovery ratio.Therefore, this hair
It is bright to improve foam oil SAGD development effectiveness.Research has shown that alternately steam injection implements SAGD using imbalance, can at least improve
Recovery ratio 10% or so.
In one embodiment, it is different from while respectively bores one up and down at the middle part of foam oil type extra heavy oil oil reservoir and bottom
The mode of mouth horizontal production well.The first level well set in oil reservoir bottom, profit can be passed through in present embodiment first
Exhaustion exploitation is carried out with the native abilities of the foam oil oil reservoir；When strata pressure is reduced to preset pressure, in oil reservoir on
Portion sets second horizontal well, switchs to SAGD productions.
Wherein, second horizontal well is located at the middle above position of the core intersection, the i.e. middle and upper part of oil reservoir；Below
First level well set close to oil reservoir bottom, be more than 1m and less than 5 meters away from oil reservoir distance from bottom.On the one hand in order to ensure to bore
Well is that horizontal well can be more securely positioned in the oil reservoir, it is necessary to ensure that the first level well is needed apart from oil reservoir bottom one
Fixed distance, on the other hand, in order to which the oil in oil reservoir is fully leaked into horizontal well, it is necessary to by first level well close to oil reservoir bottom
Portion is set.
When strata pressure is reduced to preset pressure, switch to SAGD production then, using upper and lower two mouthfuls of water horizontal wells at the same time into
Row exhaustion (cold to adopt) formula, which was developed to the cold phase of adopting, to be terminated.Can in real time or foam type described in timing acquisition is overweight in recovery process
The strata pressure of oil reservoir.When the strata pressure exhaustion is to preset pressure, the cold phase of adopting terminates, at this time, horizontal by described second
Well is as steam injection well, so as to switch to SAGD productions by the exploitation of exhaustion formula.
Wherein, the preset pressure can be 2 megapascal (MPa).Oil reservoir original formation pressure is 8MPa, utilizes native abilities
Exhaustion exploitation (cold to adopt) to strata pressure be 2MPa, then terminate it is cold adopt preparation turn SAGD produce.The water under 2MPa strata pressures
The cold well yield adopted of horizontal well has basically reached Single Well Economic production rate limit, takes full advantage of stratum energy During Natural Depletion, cold to adopt
Recovery percent of reserves is high.Turn during SAGD that strata pressure is lower at the same time, the solution gas deviate from from oil phase is more, remains in molten in oil phase
Vent one's spleen fewer, this solution gas belongs to non-condensation gas, hinders heat transfer in SAGD exploitations, influences vapor chamber development, therefore
It is cold to adopt to strata pressure that to turn SAGD when being 2MPa be best opportunity.
Referring to Fig. 3, based on the method for improving foam oil development effectiveness, improve foam oil present invention also provides one kind and open
The device of effect is sent out, specifically, it can include：
Feature recognition module 10 is produced, for obtaining the production information of two neighboring dual horizontal well well pair, based on the life
Produce the production feature that information identifies each well pair；Wherein, the production feature includes：Oil production and steam oil ratio (SOR)；
Predetermined steam injection pressure difference setup module 12, the oil production for representing two dual horizontal well wells when the production information are equal
After peaking, compare the production feature of two dual horizontal wells pair, by development effectiveness is relatively more preferable, vapor chamber development degree is opposite
The dual horizontal well well of higher is to as high pressure steam injection well, injecting the first steam injection pressure；Using another dual horizontal well well to as low
Pressure injection vapour well, injects the second steam injection pressure；First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure
Difference；
Pressure difference adjusts module 14, for maintaining the steam injection pressure difference to carry out first scheduled time of steam injection, when two double levels
After Jing Jing pairs of vapor chamber connection, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection；
Pressure difference modular converter 16, after being spaced for second scheduled time, note of the two dual horizontal well wells of conversion to steam injection well
Steam pressure；
Loop module 18, after repeating above-mentioned second scheduled time of interval, two dual horizontal well wells of conversion are to steam injection well
Steam injection pressure, until end-of-development.
The disclosed device for improving foam oil development effectiveness of the above embodiment improves foam oil development effectiveness with the application
Method embodiment it is corresponding, it is possible to achieve the application improvement foam oil development effectiveness method embodiment and the side of reaching
The technique effect of method embodiment, specifically, details are not described herein by the application.
Herein cited any digital value all include between lower limit to upper limit value with the lower value of an incremented and
The all values of upper value, there are the interval of at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity of component 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 arrived in order to illustrate also clearly listing such as 15 to 85,22 in the specification
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 endpoint and endpoint.It is used together with scope
" about " or " approximation " be suitable for two endpoints of the scope.Thus, " about 20 to 30 " are intended to covering " about 20 to about
30 ", including at least the endpoint indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Identified element, component, component or step and reality should be included by describing the term " substantially by ... form " of combination
Other elements, component, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, component, component or step it is also contemplated that substantially by these elements, component, component
Or the embodiment that step is formed.Here by using term " can with ", it is intended to it is described any to illustrate that " can with " includes
Attribute is all optional.
Multiple element, component, component or step can be provided by single integrated component, component, component or step.It is alternative
Ground, single integrated component, component, component or step can be divided into separated multiple element, component, component or step.It is used for
The open "a" or "an" for describing element, component, component or step is not said to exclude other elements, component, component
Or step.
Above-mentioned each embodiment in this specification is described by the way of progressive, identical between each embodiment
Similar portion is cross-referenced, and what each embodiment stressed is and other embodiment difference.
The foregoing is merely several embodiments of the invention, although disclosed herein embodiment as above, institute
Content is stated only to facilitate the embodiment for understanding the present invention and using, is not intended to limit the present invention.Any institute of the present invention
Belong to those skilled in the art, do not depart from disclosed herein spirit and scope on the premise of, can be in embodiment
Formal and details on make any modification and change, but the scope of patent protection of the present invention still must be with appended claims
Subject to the scope that book is defined.
Claims (10)
- A kind of 1. method for improving foam oil development effectiveness, it is characterised in that foam oil oil reservoir to be exploited includes multiple double water Horizontal well well pair, the described method includes：The production information of two neighboring dual horizontal well well pair is obtained, identifies that the production of each well pair is special based on the production information Sign；Wherein, the production feature includes：Oil production and steam oil ratio (SOR)；After the production information represents that the oil production of two dual horizontal well wells peaks, compare two dual horizontal wells pair Recovery features, using development effectiveness is relatively more preferable, vapor chamber development degree with respect to higher dual horizontal well well to as high pressure steam injection Well, injects the first steam injection pressure；Using another dual horizontal well well to as low pressure steam injection well, injecting the second steam injection pressure；It is described First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure difference；The steam injection pressure difference is maintained to carry out first scheduled time of steam injection, after the vapor chamber of two dual horizontal well wells pair connects, drop The steam injection pressure difference of low two dual horizontal well wells pair carries out steam injection；After being spaced for second scheduled time, steam injection pressure of the two dual horizontal well wells of conversion to steam injection well；After repeating above-mentioned second scheduled time of interval, steam injection pressure of two dual horizontal well wells to steam injection well is changed, until exploitation Terminate.
- 2. the method as described in claim 1, it is characterised in that first steam injection pressure is 3.4 megapascal, second steam injection Pressure is 2.0 megapascal.
- 3. method as claimed in claim 2, it is characterised in that after the steam injection pressure difference for reducing by two dual horizontal well wells pair, First steam injection pressure is 2.8 megapascal, and second steam injection pressure is 2.0 megapascal.
- 4. the method as described in claim 1, it is characterised in that any one dual horizontal well well to including：First level well and Second horizontal well, the first level well location is in the lower section predetermined distance range of second horizontal well, the first level Well spacing is between 1 meter to 5 meters with a distance from oil reservoir bottom, and second horizontal well is located above position among oil reservoir.
- 5. method as claimed in claim 4, it is characterised in that the preset distance is 8 meters to 15 meters.
- 6. method as claimed in claim 4, it is characterised in that the first level well has first horizontal segment, described second Horizontal well has the second horizontal segment, and the extending direction of the first horizontal segment and the second horizontal segment keeps horizontal, and first, second Horizontal well uses thermal recovery mode completion.
- 7. method as claimed in claim 4, it is characterised in that the method further includes：By the first level well set in oil reservoir bottom, carry out exhaustion using the native abilities of the foam oil oil reservoir and open Adopt；When strata pressure is reduced to preset pressure, second horizontal well is set in oil reservoir middle and upper part, switchs to SAGD productions.
- 8. the method for claim 7, it is characterised in that the preset pressure is 2 megapascal.
- 9. the method for claim 7, it is characterised in that it is described when strata pressure is reduced to preset pressure, switch to SAGD productions include：Using second horizontal well as the direct steam injection of steam injection well, and production is used as by the first level well Well is directly produced.
- A kind of 10. device for improving foam oil development effectiveness, it is characterised in that including：Feature recognition module is produced, for obtaining the production information of two neighboring dual horizontal well well pair, based on the production information Identify the production feature of each well pair；Wherein, the production feature includes：Oil production and steam oil ratio (SOR)；Predetermined steam injection pressure difference setup module, the oil production for representing two dual horizontal well wells when the production information reach high Behind peak, compare the recovery features of two dual horizontal wells pair, it is relatively more preferable, the opposite higher of vapor chamber development degree by development effectiveness Dual horizontal well well is to as high pressure steam injection well, injecting the first steam injection pressure；Using another dual horizontal well well to as low pressure steam injection Well, injects the second steam injection pressure；First steam injection pressure is more than second steam injection pressure, forms predetermined steam injection pressure difference；Pressure difference adjusts module, for maintaining the steam injection pressure difference to carry out first scheduled time of steam injection, when two dual horizontal well wells pair Vapor chamber connection after, the steam injection pressure difference for reducing by two dual horizontal well wells pair carries out steam injection；Pressure difference modular converter, after being spaced for second scheduled time, steam injection pressure of the two dual horizontal well wells of conversion to steam injection well；Loop module, after repeating above-mentioned second scheduled time of interval, steam injection of the two dual horizontal well wells of conversion to steam injection well Pressure, until end-of-development.
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| CN111119820A (en) * | 2018-10-30 | 2020-05-08 | 中国石油天然气股份有限公司 | SAGD oil recovery method |
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