CN107916916B - method and device for improving foam oil development effect - Google Patents
method and device for improving foam oil development effect Download PDFInfo
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- CN107916916B CN107916916B CN201710990460.7A CN201710990460A CN107916916B CN 107916916 B CN107916916 B CN 107916916B CN 201710990460 A CN201710990460 A CN 201710990460A CN 107916916 B CN107916916 B CN 107916916B
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- 239000006260 foam Substances 0.000 title claims abstract description 74
- 238000011161 development Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000000694 effects Effects 0.000 title abstract description 16
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 206
- 238000004519 manufacturing process Methods 0.000 claims abstract description 84
- 238000010796 Steam-assisted gravity drainage Methods 0.000 claims description 83
- 230000009977 dual effect Effects 0.000 claims description 71
- 238000011084 recovery Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 148
- 239000000295 fuel oil Substances 0.000 description 25
- 239000000243 solution Substances 0.000 description 19
- 239000010779 crude oil Substances 0.000 description 17
- 239000004615 ingredient Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 235000011615 Pinus koraiensis Nutrition 0.000 description 3
- 240000007263 Pinus koraiensis Species 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010795 Steam Flooding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003027 oil sand Substances 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 210000000952 spleen Anatomy 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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]
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Edible Oils And Fats (AREA)
Abstract
The invention discloses a method and a device for improving the development effect of foam oil, wherein the method comprises the following steps: obtaining production information of two adjacent double-horizontal well pairs, and identifying the production characteristics of each well pair; when the oil production of the two double-horizontal well wells reaches a peak, comparing the exploitation characteristics of the two double-horizontal well pairs, and taking the double-horizontal well pair with a relatively higher development degree of a steam cavity as a high-pressure steam injection well to inject first steam injection pressure; injecting a second steam injection pressure into the other double horizontal well pair serving as a low-pressure steam injection well; maintaining the steam injection pressure difference for steam injection for a first preset time, and reducing the steam injection pressure difference of the two double horizontal well pairs for steam injection after the steam cavities of the two double horizontal well pairs are communicated; after the interval of second preset time, converting the steam injection pressure of the two double horizontal well wells to the steam injection well; and after repeating the interval for the second preset time, converting the steam injection pressure of the two double-horizontal well wells to the steam injection well until the development is finished. The invention improves the development effect of the foam oil.
Description
Technical field
The present invention relates to technical field of petroleum extraction, in particular to a kind of method and dress for improving foam oil development effectiveness
It sets.
Background technique
The description of this part only provides and discloses relevant background information to the application, without constituting 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
It exhausts the dispersion gas-liquid two-phase occurred in recovery process and moves 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 a failure recovery process
There is no horse backs to separate from crude oil after deviating from oily phase for solution gas after stressor layer drops to bubble point pressure, but with micro-
The phenomenon that 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, generates foam oil stream, and production gas-oil ratio slowly rises at this time, and strata pressure is slow
Slow decline, has higher primiparity and primary recovery rate.With stratum energy failure and production decline, but foam oil is cold to adopt the later period
The problem of facing productivity substitution and further increasing oil recovery rate.
SAGD (steam assisted gravity drainage) technology is a kind of effectively 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, is that one kind effectively takes over the cold heat extraction by steam injection technology for adopting exploitation of horizontal well, opens in failure of foam oil
It can be further improved recovery ratio 20-30% on the basis of adopting.
Due to foam oil type extra heavy oil primary Korean pine forest with higher, during implementing SAGD, reservoir temperature
It increases, solubility of the solution gas in crude oil reduces, and a large amount of solution gas can be deviate from crude oil, and the solution gas of abjection is steamed in injection
It can be gathered on the wall surface of vapor chamber under the driving of vapour.Solution gas belongs to non-condensation gas simultaneously, has preferable heat-blocking action,
Heat transmitting of the steam to oily phase can be hindered, weakens steam to the heat effect of crude oil, limitation SAGD vapor chamber extension affects
SAGD development effectiveness.
The influence that SAGD is developed for foam oil type extra heavy oil solution gas, it is necessary to which research improves foam oil development effectiveness
Method.But there is presently no the researchs of this respect method.
Summary of the invention
The object of the present invention is to provide a kind of method and devices for improving foam oil development effectiveness, can overcome the prior art
The defects of, improve foam oil development effectiveness.
Following technical proposal can be used to realize in above-mentioned purpose of the invention:
A method of improving foam oil development effectiveness, include multiple dual horizontal well wells pair in foam oil oil reservoir to be exploited,
The described method includes:
The production information for obtaining two neighboring dual horizontal well well pair, 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 oil production of the production information two dual horizontal well wells of expression peaks, compare two dual horizontal wells
Pair recovery features, development effectiveness is relatively more preferable, vapor chamber development degree is relatively higher dual horizontal well well is to as high pressure
Steam injection well injects the first steam injection pressure；By another dual horizontal well well to as low pressure steam injection well, the second steam injection pressure is injected；
First steam injection pressure is greater than second steam injection pressure, forms predetermined steam injection pressure difference；
The steam injection pressure difference is maintained to carry out the first predetermined 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 the second predetermined time, two dual horizontal well wells are converted to the steam injection pressure of steam injection well；
After repeating above-mentioned second predetermined time of interval, two dual horizontal well wells are converted to the steam injection pressure of steam injection well, 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 is to including: that first level well and second are horizontal
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 at the 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 the first, second horizontal well is equal
Using the complete well of thermal recovery mode.
In one preferred embodiment, the method also includes:
By the first level well being arranged 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, it is raw to switch to SAGD
It produces.
In one preferred embodiment, the preset pressure is 2 megapascal.
In one preferred embodiment, described when strata pressure is reduced to preset pressure, switch to SAGD production packet
It includes: using second horizontal well as the direct steam injection of steam injection well, and directly being carried out by the first level well as producing well
Production.
A kind of device improving foam oil development effectiveness, comprising:
Feature recognition module is produced, for obtaining the production information of two neighboring dual horizontal well well pair, is 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, for indicating that the oil production of two dual horizontal well wells reaches when the production information
To after peak, compare the recovery features of two dual horizontal wells pair, relatively more preferable, vapor chamber development degree is relatively more by development effectiveness
High dual horizontal well well injects the first steam injection pressure to as high pressure steam injection well；By another dual horizontal well well to as low pressure
Steam injection well injects the second steam injection pressure；First steam injection pressure is greater 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 the first predetermined 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 conversion module converts two dual horizontal well wells to the steam injection of steam injection well after being spaced for the second predetermined time
Pressure；
Loop module converts two dual horizontal well wells to steam injection well after repeating above-mentioned second predetermined time of interval
Steam injection pressure, until end-of-development.
The features and advantages of the invention are: provided in embodiment of the present invention improvement foam oil development effectiveness method and
Device keeps certain pressure difference by adjacent SAGD well pair steam injection well steam injection pressure, can incite 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 steam and involve range to crude oil, further increase recovery ratio.Therefore, the present invention can
Improve foam oil development effectiveness.
Detailed description of the invention
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 is a kind of using balanced steam injection remaining oil distribution schematic diagram；
Fig. 2 b is a kind of using unbalanced steam injection remaining oil distribution schematic diagram；
Fig. 2 c is 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.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, elaborate to technical solution of the present invention, 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 field skill
Art personnel each fall in the application range as defined in the appended claims the modification of various equivalent forms of the invention.
The method and device described herein for improving foam oil development effectiveness is carried out specifically with reference to the accompanying drawing
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 mentions
Supplied such as following embodiments or method operating procedure shown in the drawings, but based on it is conventional or without creative labor in institute
Stating in method may include more or less operating procedure.In the step of there is no necessary causalities in logicality,
These steps execution sequence be not limited to the application embodiment offer execute sequence.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning 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 it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", "upper",
"lower", "left", "right" and similar statement for illustrative purposes only, are not meant to be the only embodiment.
The present invention provides a kind of method for improving foam oil development effectiveness, can overcome defect 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 in the position close to oil reservoir bottom.It is traditional, foam oil is cold adopt after turn SAGD and take over exploitation, be
Drill with ferrule a bite steam injection well implements SAGD production on original horizontal well producing well.Because foam oil is cold to adopt later period strata pressure drop
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 exploitation at this time, and solution gas can influence SAGD development effectiveness to steam is influenced 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 wait exploit
It include the situation of multiple dual horizontal well wells pair in foam oil oil reservoir.
In the present embodiment, it before using the method provided by the present application for improving foam oil development effectiveness, can first obtain
The oil deposit parameter for taking foam type extra heavy oil to be exploited executes following step when the oil deposit parameter, which meets SAGD exploitation, to be required:
Drilling well is being carried out after exploiting in foam type extra heavy oil oil reservoir along the depth of vertical determining first level well and the second horizontal well,
And well is carried out to the first level well and the second horizontal well in the way of thermal recovery；Wherein, the first level well location is in institute
It states in the lower section predetermined distance range of the second horizontal well, the first level well spacing is with a distance from oil reservoir bottom for greater than 1 meter；It will
The first level well and the second horizontal well as producing well while carrying out blowdown；Obtain the foam type extra heavy oil oil
The strata pressure of layer, when the strata pressure failure to preset pressure, the cold phase of adopting terminates, using second horizontal well as note
Vapour well；Direct steam injection, and directly produced by the first level well as producing well.
Specifically, the geology reservoir for being suitble to SAGD exploitation to require includes: core intersection, oil reservoir spread and crude oil
Characteristic etc..For example, reservoir buried depth, less than 1000 meters (m), reservoir thickness is greater than 20m, the net overall thickness ratio of oil reservoir is greater than 0.5, infiltration
Rate is greater than 500mD, and porosity is greater than 0.2, and oil saturation is greater 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 the complete well of thermal recovery mode.Wherein, second horizontal well is located at the centre of the core intersection
The above position, the i.e. middle and upper part of oil reservoir；Following first level well is arranged close to oil reservoir bottom, is greater than away from oil reservoir distance from bottom
1m。
Then, it carries out failure (cold to adopt) formula and develops to the cold phase of adopting to terminate simultaneously using upper and lower two mouthfuls of water horizontal wells.It was exploiting
In journey can in real time or timing acquisition described in foam type extra heavy oil oil reservoir strata pressure.When the strata pressure failure is to pre-
If the cold phase of adopting terminates when pressure, at this point, second horizontal well is replaced with steam injection well, to switch to SAGD by the exploitation of failure formula
Production.
Wherein, the preset pressure can be 2 megapascal (MPa).Oil reservoir original formation pressure is 8MPa, utilizes native abilities
Failure exploit (cold to adopt) to strata pressure be 2MPa, then terminate it is cold adopt preparation turn SAGD production.It is lauched in 2MPa strata pressure
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 that strata pressure when SAGD is lower, and the solution gas deviate from from oily phase is more simultaneously, remains in molten in oily phase
It vents one's spleen fewer, this solution gas belongs to non-condensation gas, and heat transmitting is hindered in SAGD exploitation, influences vapor chamber development, therefore
It is cold to adopt to strata pressure when being 2MPa that turn SAGD 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 well.The first level well of lower section does not do the producing well changed as SAGD.
Finally, switching to the well of SAGD to coming into effect SAGD.Wherein, different from conventional SAGD, foam oil type extra heavy oil
SAGD does not need to preheat, and the direct steam injection of steam injection well of top, the producing well of lower section directly produces.
General SAGD production process is divided into: starting warm-up phase and production phase.Starting warm-up phase is to pass through steam injection
Well and producing well thermal cycle are completed, and main target is that the high viscosity oil between steam injection well and producing well is made to form thermal communication, tool
There is mobility.Foam oil type extra heavy oil is cold to adopt the later period, and as strata pressure declines, viscosity of crude is increased, but still has a constant current
Dynamic property.Applicant is compared by numerical simulation to implement SAGD and does not preheat, preheats 5 days and preheat 30 days, in the case of these three
The discovery of SGAD exploitation effect: at above-mentioned three kinds, SAGD is tired, and yield is essentially identical, 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 starting preheating, it is cold adopt the phase after be directly entered SAGD
Production phase, 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 well is one of the important parameter for controlling draining pressure difference, rationally
Vertical well spacing be conducive to liquid-vaqor interface regulation 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 spacing 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, when SAGD steam injection well steam injection, on the other hand steam one side heating in crude oil can also drive crude oil flow direction production
Well.The vertical well spacing of injection-production well is smaller, and SAGD operation initial stage oil production 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 production is high for oil effect.With the increase of the vertical well spacing of injection-production well, steam injection well spacing
Closer from the interlayer of top of oil horizon or cap rock, heat loss is more.
Comprehensively consider SAGD recovery percent of reserves, investment payback time and heat loss, the vertical injector producer distance of foam oil type extra heavy oil is answered
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 has second with first horizontal segment, second horizontal well
The extending direction of horizontal segment, the first horizontal segment and the second horizontal segment keeps horizontal.
Applicants have found that: even if the block in exploitation structurally has the stratigraphic dip of certain angle, 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 may include
Following steps:
Step S10: obtaining the production information of two neighboring dual horizontal well well pair, identifies each well based on the production information
Pair production feature；Wherein, the production feature includes: oil production and steam oil ratio (SOR)；
Step S12: after the oil production of the production information two dual horizontal well wells of expression peaks, compare two
The recovery features of dual horizontal well pair, development effectiveness is relatively more preferable, vapor chamber development degree is relatively higher dual horizontal well well pair
As high pressure steam injection well, the first steam injection pressure is injected；By another dual horizontal well well to as low pressure steam injection well, the second note is injected
Steam pressure；First steam injection pressure is greater than second steam injection pressure, forms predetermined steam injection pressure difference；
Step S14: the steam injection pressure difference is maintained to carry out the first predetermined 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 the second predetermined time of interval, two dual horizontal well wells are converted to the steam injection pressure of steam injection well；
Step S18: after repeating above-mentioned second predetermined time of interval, two dual horizontal well wells are converted to the steam injection pressure of steam injection well
Power, until end-of-development.
In the present embodiment, the life can be based on by the production information of the two neighboring dual horizontal well well pair of acquisition
Produce the production feature that information identifies each well pair.Wherein, the production feature may include: oil production and steam oil ratio (SOR).Oil-producing
Amount is higher, the lower expression development effectiveness of steam oil ratio (SOR) is relatively preferable, and vapor chamber development degree is relatively higher.
SAGD exploitation is generally divided into three phases:
1) oil production ascent stage, the stage correspond to vapor chamber stage of development upwards；
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 boundary, starts to extend downwards.
Implement the steam injection well of two neighboring dual horizontal well (hereinafter abbreviation SAGD) well pair when the first stage of SAGD
Steam injection pressure is consistent, and steam injection pressure can be 2.8MPa.When the production information indicates the production of two dual horizontal well wells
After oil mass peaks, oil production generally can gradually successively decrease.It, can be using uneven note in order to improve foam oil development effectiveness
Vapour can promote vapor chamber development, to improve recovery percent of reserves.
Specifically, can compare the recovery features of two dual horizontal wells pair, by development effectiveness, relatively more preferable, vapor chamber is developed
The relatively higher dual horizontal well well of degree injects the first steam injection pressure to as high pressure steam injection well；Select this dual horizontal well well pair
Development as high pressure steam injection well to vapor chamber is conducive to.By another dual horizontal well well to as low pressure steam injection well, injection the
Two steam injection pressures；First steam injection pressure is greater 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 the first predetermined 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, to reduce by two SAGD well pairs after the vapor chamber connection of two SAGD well pairs
Steam injection pressure difference.When the steam injection amount of low pressure SAGD well pair steam injection well reduces suddenly, as two SAGD well pair vapor chambers are connected to
The steam injection pressure of high pressure SAGD well pair steam injection well can be reduced to 2.8MPa at this moment and continue to implement unbalanced steam injection one by the moment
Nian Hou converts the steam injection pressure of two SAGD well pair steam injection wells.High pressure steam injection well before becomes low pressure steam injection well, steam injection pressure
For 2MPa；Low pressure steam injection well before becomes high pressure steam injection well, steam injection pressure 2.8MPa.Implement not according to this steam injection pressure difference
The steam injection pressure of two SAGD well pairs is converted after balanced steam injection 1 year again, until SAGD end-of-development.
Incorporated by reference to the remaining oil distribution schematic diagram that Fig. 2 a, Fig. 2 b, Fig. 2 c difference steam injection mode obtain, illustrate that the application is mentioned
The effect that the method for the improvement foam oil development effectiveness of confession can reach.Wherein, Fig. 2 a is a kind of remaining using balanced steam injection
Oil distribution schematic diagram；Fig. 2 b is a kind of using unbalanced steam injection remaining oil distribution schematic diagram；Fig. 2 c is a kind of using unbalanced friendship
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, improves 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 is that there are pressure differences between two SAGD well pairs, so as to the precipitation solution gas that will be retained in vapor chamber
Discharge；Second is that steam flooding is one of the mechanism of oil displacement of foam oil type extra heavy oil SAGD, when unbalanced steam injection, more wells infused SAGD
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, to improve SAGD recovery percent of reserves.
In addition, combining alternately uneven steam injection on the basis of uneven steam injection, the two combination can be further increased
SAGD stage recovery percent of reserves.Specific reason is as follows: implementing 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 pressure, and vapor action is more in the heat transmitting of high this side of steam injection pressure and driving force,
Lead to 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 recovery percent of reserves；And alternately unbalanced steam injection can be on the basis of unbalanced steam injection
Model boundary reserves exploitation degree is significantly increased, increases SAGD stage recovery percent of reserves.
In conclusion the present invention provides a kind of method that uneven alternately steam injection improves foam oil SAGD development effectiveness,
The invention has the advantages that adjacent SAGD well pair steam injection well steam injection pressure keeps certain pressure difference, 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 steam and range is involved 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, at least can be improved
Recovery ratio 10% or so.
In one embodiment, it is different from while respectively boring 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 being arranged in oil reservoir bottom, benefit can be passed through in present embodiment first
Failure 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
Second horizontal well is arranged in portion, switchs to SAGD production.
Wherein, second horizontal well is located at the above position in centre of the core intersection, the i.e. middle and upper part of oil reservoir；Below
First level well be arranged close to oil reservoir bottom, be greater than 1m and less than 5 meters away from oil reservoir distance from bottom.On the one hand in order to guarantee to bore
Well is that horizontal well can be more securely positioned in the oil reservoir, needs to guarantee that the first level well is needed apart from oil reservoir bottom one
On the other hand fixed distance in order to sufficiently leak into horizontal well the oil in oil reservoir, is needed first level well close to oil reservoir bottom
Portion's setting.
When strata pressure is reduced to preset pressure, switch to SAGD production then, using upper and lower two mouthfuls of water horizontal wells simultaneously into
Row failure (cold to adopt) formula, which was developed to the cold phase of adopting, to be terminated.In recovery process can in real time or timing acquisition described in foam type it is overweight
The strata pressure of oil reservoir.When the strata pressure failure to preset pressure, the cold phase of adopting terminates, at this point, horizontal by described second
Well is as steam injection well, to switch to SAGD production by the exploitation of failure formula.
Wherein, the preset pressure can be 2 megapascal (MPa).Oil reservoir original formation pressure is 8MPa, utilizes native abilities
Failure exploit (cold to adopt) to strata pressure be 2MPa, then terminate it is cold adopt preparation turn SAGD production.It is lauched in 2MPa strata pressure
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 that strata pressure when SAGD is lower, and the solution gas deviate from from oily phase is more simultaneously, remains in molten in oily phase
It vents one's spleen fewer, this solution gas belongs to non-condensation gas, and heat transmitting is hindered in SAGD exploitation, influences vapor chamber development, therefore
It is cold to adopt to strata pressure when being 2MPa that turn SAGD be best opportunity.
Referring to Fig. 3, present invention also provides a kind of improvement foam oils to open based on the method for improving foam oil development effectiveness
The device for sending out effect, specifically, it may include:
Feature recognition module 10 is produced, for obtaining the production information of two neighboring dual horizontal well well pair, is 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, for indicating that the oil production of two dual horizontal well wells is equal when the production information
After peaking, compare the production feature of two dual horizontal wells pair, it is development effectiveness is relatively more preferable, vapor chamber development degree is opposite
Higher dual horizontal well well injects the first steam injection pressure to as high pressure steam injection well；By another dual horizontal well well to as low
Pressure injection vapour well injects the second steam injection pressure；First steam injection pressure is greater 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 the first predetermined 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 conversion module 16 converts two dual horizontal well wells to the note of steam injection well after being spaced for the second predetermined time
Steam pressure；
Loop module 18 converts two dual horizontal well wells to steam injection well after repeating above-mentioned second predetermined time of interval
Steam injection pressure, until end-of-development.
The disclosed device for improving foam oil development effectiveness of above embodiment and the application improve foam oil development effectiveness
Method implementation it is corresponding, may be implemented the application improvement foam oil development effectiveness method implementation and the side of reaching
The technical effect of method embodiment, specifically, details are not described herein by the application.
Herein cited any digital value all include between lower limit value to upper limit value with the lower value of an incremented and
The all values of upper value, there are the intervals of at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity an 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
68,43 to 51,30 to 32 is equivalent.For the value less than 1, suitably think that a unit is 0.0001,0.001,0.01,0.1.
These are only intended to the example clearly expressed, it is believed that all possibility for the numerical value enumerated between minimum and peak
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all ranges all include all numbers between endpoint and endpoint.It is used together with range
" about " or " approximation " be suitable for two endpoints of the range.Thus, " about 20 to 30 " are intended to cover that " 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.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step and reality
Other elements, ingredient, 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, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.
Multiple element, ingredient, component or step can be provided by single integrated component, ingredient, component or step.Optionally
Ground, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation.It is used to
The open "a" or "an" for describing element, ingredient, component or step is not said to exclude other elements, ingredient, component
Or step.
Above-mentioned each embodiment in this specification is described in a progressive manner, identical between each embodiment
Similar portion is cross-referenced, and what each embodiment stressed is and other embodiments difference.
The foregoing is merely several embodiments of the invention, although disclosed herein embodiment it is 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 under the premise of, can be in embodiment
Formal and details on make any modification and variation, but scope of patent protection of the invention, still must be with appended claims
Subject to the range that book is defined.
Claims (10)
1. a kind of method for improving foam oil development effectiveness, which is characterized in that include multiple double water in foam oil oil reservoir to be exploited
Horizontal well well pair, which comprises
The production information for obtaining two neighboring dual horizontal well well pair 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 oil production of the production information two dual horizontal well wells of expression peaks, compare two dual horizontal wells pair
Recovery features, development effectiveness is relatively more preferable, vapor chamber development degree is relatively higher dual horizontal well well is to as high pressure steam injection
Well injects the first steam injection pressure；By another dual horizontal well well to as low pressure steam injection well, the second steam injection pressure is injected；It is described
First steam injection pressure is greater than second steam injection pressure, forms predetermined steam injection pressure difference；
The steam injection pressure difference is maintained to carry out the first predetermined time of steam injection, after the vapor chamber connection of two dual horizontal well wells pair, drop
The steam injection pressure difference of low two dual horizontal well wells pair carries out steam injection；
After being spaced for the second predetermined time, two dual horizontal well wells are converted to the steam injection pressure of steam injection well；
After repeating above-mentioned second predetermined time of interval, two dual horizontal well wells are converted to the steam injection pressure of steam injection well, until exploitation
Terminate.
2. the method as described in claim 1, which is characterized in that first steam injection pressure is 3.4 megapascal, second steam injection
Pressure is 2.0 megapascal.
3. method according to claim 2, which is characterized 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, which is characterized in that any one dual horizontal well well to include: 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 with a distance from oil reservoir bottom between 1 meter to 5 meters, second horizontal well is located at the above position among oil reservoir.
5. method as claimed in claim 4, which is characterized in that the preset distance is 8 meters to 15 meters.
6. method as claimed in claim 4, which is characterized 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 is all made of the complete well of thermal recovery mode.
7. method as claimed in claim 4, which is characterized in that the method also includes:
By the first level well being arranged in oil reservoir bottom, failure is carried out using the native abilities of the foam oil oil reservoir and is opened
It adopts；When strata pressure is reduced to preset pressure, second horizontal well is set in oil reservoir middle and upper part, switchs to SAGD production.
8. the method for claim 7, which is characterized in that the preset pressure is 2 megapascal.
9. the method for claim 7, which is characterized in that it is described when strata pressure is reduced to preset pressure, switch to
SAGD production include: using second horizontal well as the direct steam injection of steam injection well, and by the first level well conduct production
Well is directly produced.
10. a kind of device for improving foam oil development effectiveness characterized by comprising
Feature recognition module is produced, for obtaining the production information of two neighboring dual horizontal well well pair, is 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, for indicating that the oil production of two dual horizontal well wells reaches high when the production information
Behind peak, compare the recovery features of two dual horizontal wells pair, it is development effectiveness is relatively more preferable, vapor chamber development degree is relatively higher
Dual horizontal well well injects the first steam injection pressure to as high pressure steam injection well；By another dual horizontal well well to as low pressure steam injection
Well injects the second steam injection pressure；First steam injection pressure is greater 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 the first predetermined time of steam injection, when two dual horizontal well wells pair
Vapor chamber connection after, reduce by two dual horizontal well wells pair steam injection pressure difference carry out steam injection；
Pressure difference conversion module converts two dual horizontal well wells to the steam injection pressure of steam injection well after being spaced for the second predetermined time；
Loop module converts two dual horizontal well wells to the steam injection of steam injection well after repeating above-mentioned second predetermined time of interval
Pressure, until end-of-development.
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| CN203626779U (en) * | 2013-11-08 | 2014-06-04 | 中国石油天然气股份有限公司 | Well pattern structure for exploiting heavy oil reservoir by improving steam assisted gravity drainage through solvent |
| CN104265253A (en) * | 2014-08-06 | 2015-01-07 | 中国石油天然气股份有限公司 | Heavy oil reservoir SAGD exploitation method |
| CN106351631A (en) * | 2016-08-23 | 2017-01-25 | 中国石油大学(北京) | Method for increasing dense oil single well daily output |
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| US8528639B2 (en) * | 2011-03-07 | 2013-09-10 | Conocophillips Company | Method for accelerating start-up for steam-assisted gravity drainage (SAGD) operations |
| CA2877367C (en) * | 2014-01-13 | 2020-12-22 | Conocophillips Company | Anti-retention agent in steam-solvent oil recovery |
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|---|---|---|---|---|
| CN203626779U (en) * | 2013-11-08 | 2014-06-04 | 中国石油天然气股份有限公司 | Well pattern structure for exploiting heavy oil reservoir by improving steam assisted gravity drainage through solvent |
| CN104265253A (en) * | 2014-08-06 | 2015-01-07 | 中国石油天然气股份有限公司 | Heavy oil reservoir SAGD exploitation method |
| CN106368667A (en) * | 2015-07-20 | 2017-02-01 | 中国石油天然气股份有限公司 | Three-dimensional double-horizontal well pattern for thickened oil and thickened oil exploitation method |
| CN106351631A (en) * | 2016-08-23 | 2017-01-25 | 中国石油大学(北京) | Method for increasing dense oil single well daily output |
| CN206458449U (en) * | 2017-01-09 | 2017-09-01 | 中国石油天然气股份有限公司 | Well pattern for developing layered oil reservoirs |
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