CN110318719A - A kind of two-way displacement method of positive rhythm thick formation - Google Patents
A kind of two-way displacement method of positive rhythm thick formation Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 19
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- 239000003921 oil Substances 0.000 description 60
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- 239000010779 crude oil Substances 0.000 description 4
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 102000010637 Aquaporins Human genes 0.000 description 1
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- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
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Classifications
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- 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
- E21B43/20—Displacing by water
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- Mining & Mineral Resources (AREA)
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Abstract
Disclose a kind of two-way displacement method of positive rhythm thick formation, comprising: producing well is produced in top of oil horizon, is filled the water using high permeability formation macropore or high infiltration strip as waterflood path to carry out bottom water drive；Water injection well keeps water filling simultaneously, and oil reservoir middle and upper part keeps water injection well to fill the water to producing well direction to carry out lateral water drive.The present invention is injected highly water intensive layer as horizontal well, and producing well only penetrates out top of oil horizon or top of oil horizon design level well development, both flow field had been changed and effectively controls water drive and advanced by leaps and bounds along predominant pathway, again using predominant pathway under the effect of gravity it is vertical it is upper sufficiently involve, to greatest extent raising ultra-high water-containing oil recovery rate.
Description
Technical field
The present invention relates to a kind of methods for improving oilfield water flooding recovery ratio, more particularly, to a kind of positive rhythm thick formation
Two-way displacement method.
Background technique
China's oilfield reservoir is mostly the multilayer field of continental sandstone deposition, serious with heterogeneity in plane on longitudinal direction,
Oil reservoir internal penetration rate is differential big, and the positive rhythm distribution characteristics that top is low, lower part is high is presented in river channel sand permeability more.Positive rhythm
Thick oil pay oil reservoir injects in development process, and water is injected in the lower part high permeability zone position channelling easily relatively high from permeability of injection water
Less permeable layer position can not effectively be involved, the crude oil in less permeable layer position cannot be employed effectively, and " bottom water logging, top richness are formd
The remaining oil distribution feature of collection ", waterflood recovery efficiency factor are lower.By taking Shengli Oil Field as an example, developed field waterflood recovery efficiency factor is only at present
It is 22.8%, the recovery ratio that improves a lot space.
After positive rhythm thick formation waterflooding development to ultra-high water-containing stage, the generally existing highly water intensive macropore in oil reservoir bottom or
High infiltration strip.Numerical simulation study shows that 15% highly water intensive layer band consumes the 90% of total water injection rate, and affusion utilizing ratio is low.
Conventional modification scenario thinking is that closure improvement is carried out to highly water intensive macropore, and currently used method for blocking has period note
The methods of water, horizontal well locus, shallow profile water blockoff and deep profile controlling.
Liang Wenfu etc. improves BLOCK OF LAMADIAN OIL FIELD late high water content period development effectiveness using cyclic waterflooding method, the study found that just
Rhythm thick oil pay in conventional waterflooding, advance by leaps and bounds, and water drive involves difference by the part of injection water easy to form.And stop in cyclic waterflooding
Note is reduced in water injection rate half period, and due to the difference of oil saturation and permeability, the decline of Thief zone site pressure is fast, low
It is slowed down under infiltration site pressure, causes synchronization Thief zone site pressure lower, hyposmosis site pressure is higher, generating unit
Between difference of extra pressure, alter grease to Thief zone position from the higher hyposmosis position of oil saturation；Again water filling or
Water injection rate half period is increased, Thief zone site pressure resume speed is fast, and hyposmosis site pressure resume speed is slow, generates reversed
Difference of extra pressure, grease is again from the lower Thief zone position channelling of oil saturation to hyposmosis position, with making hyposmosis position
Stressor layer enhancing has more oil from the channelling of hyposmosis position to Thief zone position accumulation energy for next cycle, thus
In one complete period, there are more water to alter from Thief zone position to hyposmosis position, more oil are altered from hyposmosis position
To Thief zone position, expand water drive swept volume, improving ecology development effectiveness.Therefore, heterogeneity (including in layer and plane)
It is the necessary condition of cyclic waterflooding, however, to ensure that the exchange of fluid, a large amount of interlayer cannot be developed in layer.For non-in layer
Homogeneous pay, it is desirable that longitudinal permeability is larger, just can fully ensure that the exchange of fluid in this way.
Shu Qinglin etc. is to positive rhythm thick formation remaining oil distribution pattern and horizontal well locus the study found that horizontal well pair is in folder
It is relatively preferable that layer develops stable positive rhythm thick formation effect.Interlayer is a kind of master for controlling positive rhythm thick formation remaining oil enrichment
Want factor, the presence of interlayer frequently results in that water drive effect in top of oil horizon is weak, and remaining oil saturation is good, and interlayer, which has, in addition blocks work
With therefore, stable positive rhythm thick formation being developed to interlayer, it is a kind of effective measures that carrying out horizontal well, which is taped the latent power, at the top of it, both
The remaining oil at top can be exploited, and be avoided that the coning of bottom secondary bottom water.
Liu Lizhi etc. studies positive rhythm thick formation high water-cut stage Tapping Potential Method, it is believed that water injection well shallow profile, which refers to, to be infused
Well near wellbore squeezes into a certain amount of blocking agent and blocks strong water absorption layer (or position) improvement intake profile, and then improving ecology is developed
Effect.Since injection water has around flow phenomenon, shallow profile is mainly used to solve the problems, such as the non-homogeneous water suction of interlayer.Accordingly
Ground, oil well superficial part water blockoff are mainly used for solving the problems, such as that the single layer as caused by interlayer heterogeneity is discharged.To positive rhythm heat-bodied oil
For layer, although the potentiality of high water-cut stage are concentrated mainly in layer, as long as stratum has certain condition, especially interlayer is relatively sent out
When educating, shallow profile water blockoff still is able to play certain effect of taping the latent power.When interlayer agensis, but longitudinal permeability is differential larger
When, the dominant flowing path of positive rhythm thick formation bottom is relatively developed, and injection water is serious along bottom non-available water circulation, close to production
The region of well, top of oil horizon form a large amount of remaining oils, and shallow profile effect is undesirable.
Liu's conjunction etc. is to Weak Gels profile control analysis of Influential Factors in water drive later period In Thick Reservoirss, it is believed that deep profile controlling is for interlayer
The positive rhythm thick formation effect that agensis, bottom form clear superiority seepage channel is more apparent.It can to infuse in earth formation deep
Enter the remaining oil that water is more enriched with around diffluence displacement.Deep profile controlling mainly uses large dosage of injection mode, and blocking agent is headed into stratum
Deep, to avoid streaming in vain for injection water.Profile-controlling and plugging agent is infused to oil deposit deep part, not only plug agent amount is big, and stifled
Agent is big by shear distance, is difficult to keep original property plastic in oil deposit deep part.The positive rhythm thick formation of fluvial facies deposit is passed through
After long-time waterflooding extraction, due to the influence of the factors such as physical difference and interlayer in rhythmic nature, layer, it can be enriched at the top of it big
Measure remaining oil.Remaining oil at the top of positive rhythm thick formation of taping the latent power at present frequently with horizontal well.It is remaining at the top of thick oil pay for excavating
Oil horizontal well be generally deployed in top of oil horizon, around have straight well water filling supply displacement energy, water filling position horizontal well is opened
State is started to be affected.In thick oil pay initial stage of development, water injection well water filling position is normally at oil reservoir bottom, can play increasing in this way
Add the effect of sweep area.But after long-term injecting water is developed, oil reservoir bottom is serious by water logging, when this will cause horizontal well production
Bottom water coning phenomenon is serious, and exploitation effect is undesirable.
Liu Yuzhang etc. proposes a kind of method (application number for improving water drive recovery factor of thick positive rhythm reservoir
200910083119.9), it is related to a kind of horizontal well gel deep rock tunneling improvement positive rhythm thick formation reservoir water drive method；?
The high permeability zone horizontal well drilling of positive rhythm thick formation injects gel to high permeability zone by horizontal well, establishes in high permeability zone
With the consistent checkdam of high permeability zone height, middle part of the horizontal well between water injection well and producing well or the position close to oil well
It sets；The kv/kh (vertical horizontal permeability ratio) of the high permeability zone is between 0.01~0.2；The horizontal well uses perforation side
The complete well of formula, horizontal well diameter are 5~10 inches；The gel be acrylamide, activated starch, phenolic resin, organic chrome jelly,
Silicate adds calcium chloride or silicate to add dilute hydrochloric acid；This method can increase positive rhythm thick formation water drive oil filtrational resistance, change
Water flowing direction is injected, forces injection water to flow to hyposmosis crude oil with respect to enrichment region, expands swept volume, improves displacement of reservoir oil effect
Fruit.
In conclusion the existing water drive recovery factor of thick positive rhythm reservoir method that improves is mainly to carry out to highly water intensive macropore
It administers or evades, the effect is not very satisfactory, effectively taps the latent power therefore, it is necessary to develop a kind of positive rhythm thick formation high water-cut reservoir
Method, to improve waterflood recovery efficiency factor.
The information for being disclosed in background of invention part is merely intended to deepen the reason to general background technique of the invention
Solution, and it is known to those skilled in the art existing to be not construed as recognizing or imply that the information is constituted in any form
Technology.
Summary of the invention
In order to improve water drive recovery factor of thick positive rhythm reservoir, low permeability reservoir remaining oil of effectively taping the latent power, the invention proposes one
The two-way displacement method of kind positive rhythm thick formation.This method comprises: producing well is produced in top of oil horizon, by high permeability formation macropore
Road or high infiltration strip are filled the water as waterflood path to carry out bottom water drive；Water injection well keeps water filling simultaneously, and oil reservoir middle and upper part is protected
Water injection well is held to fill the water to producing well direction to carry out lateral water drive.
Preferably, the vertical horizontal permeability ratio of the positive rhythm thick formation is between 0.05~0.5.
Preferably, the permeability grade of the positive rhythm thick formation is between 4.0-10.0.
Preferably, the producing well is horizontal well.
Preferably, the horizontal well redeploys progress horizontal drilling by top of oil horizon and is formed, or in old well
On the basis of carry out horizontal drilling and formed.
Preferably, the layer position that the horizontal well pierces is less permeable layer.
Preferably, the producing well is straight well, retains top perforations and is produced.
Preferably, the layer position where the top perforations is position permeable formation.
Preferably, it is aqueous more than 90%~98% after start to carry out bottom water drive and lateral water drive.
Compared with prior art, the beneficial effects of the present invention are: the present invention injects highly water intensive layer as horizontal well, and
Producing well only penetrates out top of oil horizon or top of oil horizon design level well development, had both changed flow field and has effectively controlled water drive along predominant pathway
Advance by leaps and bounds, but using predominant pathway under the effect of gravity it is vertical it is upper sufficiently involve, to greatest extent improve ultra-high water-containing oil field harvesting
Rate.
Methods and apparatus of the present invention has other characteristics and advantages, these characteristics and advantages are attached from what is be incorporated herein
It will be apparent in figure and subsequent specific embodiment, or will be in the attached drawing and subsequent specific implementation being incorporated herein
It is stated in detail in example, these the drawings and specific embodiments are used together to explain specific principle of the invention.
Detailed description of the invention
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
Fig. 1 is to be opened according to horizontal well in the two-way displacement method of the positive rhythm heat-bodied oil thickness of exemplary embodiments of the present invention
The schematic diagram of hair；
Fig. 2 is to be developed according to straight well in the two-way displacement method of the positive rhythm heat-bodied oil thickness of exemplary embodiments of the present invention
Schematic diagram；
Fig. 3 shows the comprehensive water cut change curve comparison produced using straight well and horizontal well；
Fig. 4 shows influence of the straight well longitudinal direction perforation extent to recovery ratio and its amplitude is improved；
Fig. 5 shows influence of the straight well with horizontal well development difference adjustment opportunity to recovery ratio is improved.
Specific embodiment
The original for the method that improvement is different, uses in the present invention is blocked to highly water intensive macropore from conventional positive rhythm thick formation
Reason does not block or administers macropore instead of, and macropore guidance injection water is made full use of to form artificial bottom water drive plus side Xiang Bianshui
The two-way displacement driven.Specifically, a kind of two-way displacement method of positive rhythm thick formation according to the present invention includes: producing well in oil
Layer top is produced, and is filled the water using macropore or high infiltration strip as waterflood path to carry out bottom water drive；Simultaneously in oil reservoir
Continue that water injection well is kept to fill the water to producing well direction to carry out lateral water drive in top.
This method keeps filling the water to original annotation well, and producing well is produced in top of oil horizon.Producing well can be distributed across
The horizontal well of top of oil horizon, can be to redeploy by top of oil horizon and carries out the new well that is formed of horizontal drilling, can also be with
Horizontal drilling is carried out on the basis of Jiu Jing and is formed, and the layer position that horizontal well pierces is less permeable layer；Producing well is also possible to
Straight well only retains top of oil horizon production, i.e. reservation top perforations are produced, and the layer position where the top perforations of the straight well is
Position permeable formation.
Meanwhile make full use of macropore or the small advantage of high infiltration strip filtrational resistance, using macropore or high infiltration strip as
Inject aquaporin.It after injecting water full of macropore or high infiltration strip, is migrated from oil reservoir bottom to middle and upper part, plays similar bottom water drive
Effect；Meanwhile oil reservoir middle and upper part continues that water injection well is kept to fill the water to producing well direction, plays the effect of similar lateral water drive,
It is achieved in two-way displacement of the bottom water drive plus side to water drive.
This method is injected highly water intensive layer as horizontal well, and producing well is only only produced in top of oil horizon, is both changed
Flow field effectively controls water drive and advances by leaps and bounds along predominant pathway, but using predominant pathway under the effect of gravity it is vertical it is upper sufficiently involve, it is maximum
The raising ultra-high water-containing oil recovery rate of limit.
The vertical horizontal permeability ratio of the positive rhythm thick formation is between 0.05~0.5.
The permeability grade of the positive rhythm thick formation is between 4.0-10.0.
Start to be different using the recovery ratio that two-way displacement method of the invention is realized in different water cut stages, preferably
It is aqueous more than 90%~98% after start to carry out bottom water drive and lateral water drive.
The preferred embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.On the contrary, thesing embodiments are provided so that the present invention is more thorough and complete, and can will be of the invention
Range is completely communicated to those skilled in the art.
Figures 1 and 2 show that the original of the two-way displacement of positive rhythm heat-bodied oil thickness according to an illustrative embodiment of the invention
Manage schematic diagram.
As depicted in figs. 1 and 2, reservoir division is 4 layers, wherein layer 4 belongs to high permeability formation, and layer 1 belongs to low-permeability layer.
In the embodiment shown in figure 1, producing well is the horizontal well in low-permeability layer, by the high permeability formation macropore in layer 4
Road or high infiltration strip are filled the water as waterflood path to carry out bottom water drive, meanwhile, it is that the water injection well of straight well keeps water filling, in oil
Layer middle and upper part keeps water injection well to carry out lateral water drive to producing well direction water filling Confucian Temple.
In the embodiment shown in figure 2, producing well is straight well, only retains top perforations, i.e. penetrating in low-permeability layer
Hole is produced, using in layer 4 high permeability formation macropore or high infiltration strip fill the water to carry out bottom water drive, together as waterflood path
When, it is that the water injection well of straight well keeps water filling, in oil reservoir middle and upper part, holding water injection well carries out lateral to producing well direction water filling Confucian Temple
Water drive.
Using example:
To the western Ng5 in 7th area Gu Dong2+3Oil reservoir is using the double of positive rhythm thick formation according to an illustrative embodiment of the invention
To displacement method.The oil reservoir underground crude oil viscosity 40mPa.s, crude oil density in stock tank 0.95g/cm3.Positive rhythm thick formation hyposmosis
Layer position 1000mD, high permeability zone position permeability are 4000~10000mD, permeability grade 4~10.
Commingled water injection first, injection rate 0.1PV/a keep balanced flood in development process, and predicted condition water drive is to containing
The measure of the invention for realizing two-way displacement using macropore is come into effect after water 90%~98%, is predicted to aqueous 98%, it is right
Compare oil increasing effect.
Numerical simulation uses CMG numerical simulation for oil-gas reservoir software, geologic model grid number: X=81, Y=81, Z=4.Step
Long: four lattice of X-direction 10m/ lattice, Y-direction 10m/ lattice, Z-direction are respectively 2m, 3m, 3m, 2m.Simulate positive rhythm thick formation top
Less permeable layer permeability 1000mD, lower layer 4000~10000mD of permeability, differential 4~10, kv/kh=0.1.Well network design is
Staggered line-drive pattern, 4 mouthfuls of injection wells, 9 mouthfuls of producing wells, well spacing 200m.
For the actual features of positive rhythm thick formation, the waterflooding effect of different optimum regulating schemes is had studied.Fig. 3, which is shown, to be adopted
The comprehensive water cut change curve comparison produced with straight well and horizontal well, can optimize well type with reference to the result of Fig. 3.Such as
It is obvious that adjustment effect is carried out shown in Fig. 3, after comprehensive water cut 98%, and horizontal well development is developed better than straight well.Wherein, horizontal well is opened
It sends out aqueous and declines 25.6% greater than straight well exploitation (decline 8.9%), and the horizontal well development cone of depression is developed more relative to straight well
It is wide.
Fig. 4 shows influence of the straight well longitudinal direction perforation extent to recovery ratio and its amplitude is improved, can be to vertical with reference to the result of Fig. 4
It is optimized to perforation extent.1 is penetrated out, penetrates out 123 layers, penetrates out 12 layers and only penetrated out entirely by comparing the perforation in 4 layers
Recovery ratio and raising recovery ratio amplitude when layer compare, as shown in figure 4, only penetrating open position in low-permeability layer (i.e. 1 layer)
Recovery ratio when perforation finally, improved recovery ratio amplitude also highest, effect are best.
Fig. 5 show straight well and horizontal well development difference adjustment opportunity to improve recovery ratio influence, with reference to Fig. 5's as a result,
Comprehensive water cut adjustment opportunity can be optimized.Start to be realized using two-way displacement method of the invention in different water cut stages
Recovery ratio be different, and the recovery ratio of straight well and horizontal well is also different.As shown in Figure 5, after aqueous more than 90%
Starting to carry out bottom water drive and lateral water drive can preferably play the role of improving recovery ratio, and it is aqueous closer to 98% when tune
Whole, the amplitude for improving recovery ratio is higher.
It is very poor on raising recovery ratio influence that table 1 shows different permeabilities.According to the result of table 1 it is found that permeability grade simultaneously
Bigger, the increased amplitude of recovery ratio is bigger.
Table 1
| Permeability grade | Base case recovery ratio % | Adjusted Option recovery ratio % | Improve recovery ratio % |
| 4 | 40.74 | 44.14 | 3.40 |
| 6 | 38.03 | 42.20 | 4.17 |
| 8 | 35.34 | 40.31 | 4.97 |
| 10 | 32.88 | 38.44 | 5.56 |
Show to increase to 98% from 90% with comprehensive water cut adjustment opportunity by above simulation, horizontal well development mentions
High recovery rate amplitude gradually rises, and when comprehensive water cut 98% adjusts, and recovery ratio 4.4% can be improved in digital-to-analogue prediction.With longitudinal infiltration
The differential increase of saturating rate, Adjusted Option ultimate recovery gradually decrease, but compared with base case, improve recovery ratio amplitude and gradually increase
Greatly, improving recovery ratio maximum value is 6.0%.
Present invention optimizes the methods that water drive improves recovery ratio, improve recovery ratio to positive rhythm thick formation and are particularly in spy
High water cut stage oil reservoir, which improves recovery ratio, has very important application and promotion prospect.
It will be understood by those skilled in the art that above to the purpose of the description of the embodiment of the present invention only for illustratively saying
The beneficial effect of bright the embodiment of the present invention is not intended to limit embodiments of the invention to given any example.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport
In the principle, practical application or improvement to the technology in market for best explaining each embodiment, or make the art
Other those of ordinary skill can understand each embodiment disclosed herein.
Claims (9)
1. a kind of two-way displacement method of positive rhythm thick formation characterized by comprising
Producing well is produced in top of oil horizon, using high permeability formation macropore or high infiltration strip as waterflood path fill the water with into
Row bottom water drive；Water injection well keeps water filling simultaneously, and oil reservoir middle and upper part keeps water injection well to fill the water to producing well direction to carry out lateral water
It drives.
2. the two-way displacement method of positive rhythm thick formation according to claim 1, which is characterized in that the positive rhythm heat-bodied oil
The vertical horizontal permeability ratio of layer is between 0.05~0.5.
3. the two-way displacement method of positive rhythm thick formation according to claim 1, which is characterized in that the positive rhythm heat-bodied oil
The permeability grade of layer is between 4.0-10.0.
4. the two-way displacement method of positive rhythm thick formation according to claim 1, which is characterized in that the producing well is water
Horizontal well.
5. the two-way displacement method of positive rhythm thick formation according to claim 4, which is characterized in that the horizontal well passes through
Top of oil horizon, which redeploys, to carry out horizontal drilling and is formed, or carries out horizontal drilling on the basis of Jiu Jing and formed.
6. the two-way displacement method of positive rhythm thick formation according to claim 5, which is characterized in that the level pierced
Layer position is less permeable layer.
7. the two-way displacement method of positive rhythm thick formation according to claim 1, which is characterized in that the producing well is straight
Well retains top perforations and is produced.
8. the two-way displacement method of positive rhythm thick formation according to claim 1, which is characterized in that the top of the straight well
Layer position where perforation is position permeable formation.
9. the two-way displacement method of positive rhythm thick formation according to claim 1, which is characterized in that it is aqueous more than 90%~
Start to carry out bottom water drive and lateral water drive after 98%.
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| CN201810264568.2A CN110318719A (en) | 2018-03-28 | 2018-03-28 | A kind of two-way displacement method of positive rhythm thick formation |
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| CN201810264568.2A CN110318719A (en) | 2018-03-28 | 2018-03-28 | A kind of two-way displacement method of positive rhythm thick formation |
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| CN113818849A (en) * | 2020-06-18 | 2021-12-21 | 中国石油化工股份有限公司 | Method for improving oil extraction speed of oil-water reverse migration development with low cost |
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