CN110410045A - A kind of stifled tune method for ultra-high water cut stage oil reservoir - Google Patents
A kind of stifled tune method for ultra-high water cut stage oil reservoir Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 153
- 230000035699 permeability Effects 0.000 claims description 30
- 230000000903 blocking effect Effects 0.000 claims description 28
- 238000005325 percolation Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 17
- 239000004519 grease Substances 0.000 claims description 15
- 238000007667 floating Methods 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 8
- 239000010779 crude oil Substances 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
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- 229920000642 polymer Polymers 0.000 description 7
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- 239000003431 cross linking reagent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
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- 229920002627 poly(phosphazenes) Polymers 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
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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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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a kind of stifled tune methods for ultra-high water cut stage oil reservoir, this method comprises: Step 1: according to remaining oil distribution feature, determine the water drive belt type of target reservoir reservoir, water drive belt type includes three extreme water-flushed zone, strong watered-out zone and weak aquifer drive band levels, and the water flooding degree of extreme water-flushed zone, strong watered-out zone and weak aquifer drive band successively successively decreases；Step 2: then determining corresponding stifled tune system and system dosage according to the reservoir characteristic parameter of the type water-flushed zone when the target reservoir reservoir includes extreme water-flushed zone；Step 3: carrying out stifled tune to the well section and depth of the extreme water-flushed zone based on stifled tune system and system dosage.This method establishes a kind of reservoir water drive partition of the level standard based on water plugging and profile controlling of science for ultra-high water cut stage reservoir development feature and remaining oil distribution, new ultra-high water-containing oil field depth is established for the extreme water-flushed zone in the criteria for classifying simultaneously and blocks up tune method, is conducive to improve ultra-high water cut reservoir water plugging and profile controlling effect.
Description
Technical field
The invention belongs to oil-gas field development technical fields, are related to a kind of side of water plugging and profile controlling for ultra-high water cut stage oil reservoir
Method.
Background technique
Water plugging and profile controlling is the important technology of improving ecology, and with deepening continuously for oil field development, middle and high infiltration water-drive pool is general
All over ultra-high water cut stage is entered, stage remaining oil bat generally disperses, and reservoir is more complicated, stores up in longitudinal and plane in layer
Layer water flooded grade divide it is more difficult, traditional nearly well water plugging and profile controlling improve the method for section field result increasingly
Difference.
In existing literature report, according to remaining oil water flooded grade be defined as strong water logging, in strong water logging, middle water logging and weak
Four ranks of water logging, the criteria for classifying is single, concept is unintelligible, can not instruct the filed application of water plugging and profile controlling, lead to water plugging and profile controlling
Effect is undesirable.In addition, the existing technique in relation to water plugging and profile controlling is concentrated mainly on to macropore, dominant flowing path or channelling
In the closure in channel, is not taken for reservoir feature and the techniques such as targetedly block or regulate and control.It opens mining site is practical
During hair, especially ultra-high water-containing block only relies on the single macropore of closure, predominant pathway or high permeability zone band and is unable to reach
Improve the purpose of oil recovery factor.
Therefore, it is necessary to for medium to high permeable water-drive pool ultra-high water cut stage reservoir establish it is a kind of science based on water blockoff tune
The reservoir water drive partition of the level standard cutd open, while being administered based on the classification of different level water drive bands and establishing new ultra-high water-containing oil field depth
Stifled tune method is spent, achievees the purpose that improve recovery ratio, provides technical support for water plugging and profiling technology filed application and progress.
Summary of the invention
The first technical problem to be solved by the present invention is to need to provide a kind of stifled tune side for ultra-high water cut stage oil reservoir
Method, this method for ultra-high water cut stage reservoir development feature and remaining oil distribution establish a kind of science based on water plugging and profile controlling
Reservoir water drive partition of the level standard, while new ultra-high water-containing oil field depth is established for the extreme water-flushed zone in the criteria for classifying
Stifled tune method.
In order to solve the above-mentioned technical problem, embodiments herein provides firstly a kind of for ultra-high water cut stage oil reservoir
Stifled tune method, this method comprises: Step 1: determining the water drive belt type of target reservoir reservoir, institute according to remaining oil distribution feature
Stating water drive belt type includes three extreme water-flushed zone, strong watered-out zone and weak aquifer drive band levels, the extreme water-flushed zone, strong watered-out zone
Successively successively decrease with the water flooding degree of weak aquifer drive band；Step 2: then basis should when the target reservoir reservoir includes extreme water-flushed zone
The reservoir characteristic parameter of type water-flushed zone determines corresponding stifled tune system and system dosage；Step 3: being based on the stifled tune body
System and system dosage carry out stifled tune to the well section and depth of the extreme water-flushed zone.
According to one embodiment of present invention, in said step 1, by the surplus of each region of the target reservoir reservoir
Excess oil saturation degree compares respectively with residual oil saturation and leading edge oil saturation, determines the oil reservoir according to comparison result
Water drive belt type, in which: if remaining oil saturation be less than or equal to residual oil saturation, the region be extreme water-flushed zone；
If remaining oil saturation, between residual oil saturation and leading edge oil saturation, which is strong watered-out zone；If remaining
Oily saturation degree is greater than or equal to leading edge oil saturation, then the region is weak aquifer drive band.
According to one embodiment of present invention, the residual oil saturation in each region is determined as follows, obtains mesh
Mark grease phase percolation curve corresponding to oil reservoir；Based on the grease phase percolation curve, institute is determined according to the preset moisture content threshold value
Corresponding water saturation determines residual oil saturation according to the water saturation.
According to one embodiment of present invention, the water saturation is determined according to following expression:
Wherein, fwIndicate preset moisture content threshold value, sw1Indicate water saturation, kroIndicate oil relative permeability, krwTable
Show water phase relative permeability, μwIndicate water flooding viscosity, μoIndicate underground crude oil viscosity.
According to one embodiment of present invention, the residual oil saturation is determined according to following expression:
so1r=(1+m) × so1
Wherein, so1rResidual oil saturation after indicating optimization, m indicate default floating coefficient, so1Indicate actual residual oil
Saturation degree, so1=1-sw1, wherein the value range of default floating Coefficient m includes [0,30%].
According to one embodiment of present invention, the leading edge oil saturation is determined as follows, using acquired
The grease phase percolation curve arrived, according to the functional relation of moisture content and water saturation, the moisture content constructed under the same coordinate system is bent
Line；Using irreducible water saturation as starting point, Xiang Suoshu plot of water cut makees tangent line, determines corresponding to the point of contact containing water saturation
Degree, obtains waterflood front water saturation；Leading edge oil saturation is determined according to the waterflood front water saturation.
According to one embodiment of present invention, in the step 2, according to best block-up position and extreme water-flushed zone
Porosity determines stifled tune system dosage.
According to one embodiment of present invention, the stifled tune system dosage is determined according to following expression:
Wherein, VfIndicate stifled tune system dosage, RfIndicate that best block-up position, H indicate core intersection, hjIndicate extreme water
Wash the volume accounting of band, φjIndicate the porosity of extreme water-flushed zone.
According to one embodiment of present invention, best block-up position is determined as follows, utilizes physical simulation experiment
Determine that the obtained different type of physical analogy to the sealing ratiod of extreme water-flushed zone reservoir core, is blocked system pair by closure system
The sealing ratiod of extreme water-flushed zone reservoir core is input in the numerical simulator for meeting target reservoir reservoir characteristics, with target oil
Maximum ratio for input and output is judgment basis under valence, determines best blocking radius, blocks position using the best blocking radius as best
It sets.
According to one embodiment of present invention, the stifled tune system includes high molecular polymerization species, microballoon class, organic-inorganic
Discontinuous phase particulate species, technical indicator are that stifled sealing ratiod of the tune system in target reservoir porous media is more than or equal to 80%, are had
The effect phase is greater than 12 months or more.
Compared with prior art, one or more embodiments in above scheme can have following advantage or beneficial to effect
Fruit:
The stifled tune method of the new ultra-high water cut stage oil reservoir of one kind provided by the invention, it is special for ultra-high water cut stage reservoir development
Point and remaining oil distribution establish a kind of reservoir water drive partition of the level standard based on water plugging and profile controlling of science, can contain to extra-high
The oil reservoir of water phase more finely, accurately identify, to provide decision-making foundation for ultra-high water cut stage water plugging and profile controlling.Especially
It is to establish new ultra-high water-containing oil field depth for extreme water-flushed zone and block up tune method, closure system and system dosage therein
Setting, 80% or more is reached to the sealing ratiod of permeability, be conducive to improve ultra-high water cut reservoir water plugging and profile controlling effect.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that being understood by implementing technical solution of the present invention.The objectives and other advantages of the invention can by
Specifically noted structure and/or process are achieved and obtained in specification, claims and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to the technical solution of the application or further understanding for the prior art, and constitutes specification
A part.Wherein, the attached drawing for expressing the embodiment of the present application is used to explain the technical side of the application together with embodiments herein
Case, but do not constitute the limitation to technical scheme.
Fig. 1 is the flow diagram of the method for the water plugging and profile controlling for ultra-high water cut stage oil reservoir of the embodiment of the present application.
Fig. 2 is the flow diagram of the stifled tune method for the extreme water-flushed zone in the criteria for classifying of the embodiment of the present application.
Fig. 3 is the somewhere scene core oil saturation distribution schematic diagram of the embodiment of the present application.
Fig. 4 is the schematic diagram of grease phase percolation curve corresponding to the target reservoir of the embodiment of the present application.
Fig. 5 is plot of water cut schematic diagram corresponding to the target reservoir of the embodiment of the present application.
Fig. 6 includes plot of water cut schematic diagram corresponding to the target reservoir of tangent line for the embodiment of the present application.
Fig. 7 is the schematic diagram of the injection sealing agent for extreme water-flushed zone of the embodiment of the present application.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching relevant art effect can fully understand and implement.This Shen
Please each feature in embodiment and embodiment, can be combined with each other under the premise of not colliding, be formed by technical solution
It is within the scope of the present invention.
Meanwhile in the following description, for illustrative purposes and numerous specific details are set forth, to provide to of the invention real
Apply the thorough understanding of example.It will be apparent, however, to one skilled in the art, that the present invention can not have to tool here
Body details or described ad hoc fashion are implemented.
The water logging state that existing technical solution is determined is not generated with reservoir waterflood efficiency or remaining oil and is effectively closed
Connection, therefore it is difficult for the stifled tune case valuation of ultra-high water cut stage and Optimal Decision-making provides accurate foundation.
For the problems of in the prior art, being designed to provide for the embodiment of the present invention is a kind of for ultra-high water-containing
The stifled method adjusted of the depth step by step of the different level water drive bands of phase water controlled field.In the present embodiment, it is based on remaining oil saturation
Different level water drive bands are divided, are obtained reservoir water drive " three bands ", i.e., extreme water-flushed zone, strong watered-out zone and weak aquifer drive band, then,
Static data is moved by block reservoir, is calculated by physical analogy and seepage theory, water drive " three bands " stifled transfer drive is established and combines
Regulation method, it is final to realize reservoir equilibrium displacement, promote that depth is stifled to adjust effect.It is special that this method is particularly suitable for medium to high permeable oil reservoir
The water drive belt type of high water-cut stage identifies, can carry out more finely, accurately identifying to the oil reservoir of ultra-high water cut stage, to be
Ultra-high water cut stage water plugging and profile controlling provides decision-making foundation.
Below with reference to the accompanying drawings the embodiment of the present invention is specifically described.
Fig. 1 is the flow diagram of the method for the water plugging and profile controlling for ultra-high water cut stage oil reservoir of the embodiment of the present application.
As shown in Figure 1, according to remaining oil distribution feature, determining target reservoir reservoir in step S110 (step 1)
Water drive belt type, wherein water drive belt type includes three extreme water-flushed zone, strong watered-out zone and weak aquifer drive band levels, extreme washing
The water flooding degree of band, strong watered-out zone and weak aquifer drive band successively successively decreases.
In embodiments of the present invention, different level water drive bands are defined as follows:
(1) extreme water-flushed zone is in water-drive pool, through high speed, big inflow-rate of water turbine (unit seepage section product injection water throughput,
m3/m2) water drive, region of the remaining oil saturation gradually formed less than or equal to residual oil saturation.
(2) strong watered-out zone is in water-drive pool, and through low speed, small inflow-rate of water turbine water drive, the remaining oil saturation gradually formed is situated between
Region between residual oil saturation and leading edge oil saturation.
(3) weak aquifer drive band is in water-drive pool, and driven water-replacing is not broken through integrally and remaining oil saturation contains more than or equal to leading edge
The region of oily saturation degree.
Based on defined above, in this step, by the residual oil saturation in each region of the target reservoir reservoir and before
Edge oil saturation, the remaining oil saturation with the region compares respectively, and the water of the oil reservoir is determined according to comparison result
Drive belt type, in which: if remaining oil saturation is less than or equal to residual oil saturation, which is extreme water-flushed zone.If surplus
Excess oil saturation degree is between residual oil saturation and leading edge oil saturation, then the region is strong watered-out zone.If remaining oil is full
It is greater than or equal to leading edge oil saturation with degree, then the region is weak aquifer drive band.
The residual oil saturation for how determining each region and leading edge oil saturation will be illustrated next.
1, the residual oil saturation in each region is determined as follows, firstly, obtaining oil corresponding to target reservoir
Then water phase percolation curve is based on grease phase percolation curve, corresponding water saturation, root are determined according to preset moisture content threshold value
Residual oil saturation is determined according to water saturation.
Specifically, choose target reservoir representative reservoir core, to target reservoir have similar characteristics of reservoirs reservoir
Rock core or the artificial core that can characterize target reservoir reservoir characteristic are then contained using steady state method or cold store enclosure measuring and calculation
Mathematical relationship between the relative permeability of water saturation, the relative permeability of oily phase and water phase, to obtain target reservoir
Corresponding grease phase percolation curve.
In the present embodiment, when choosing rock core, the core hole of target reservoir can use to obtain the representative of target reservoir
Property reservoir core.And when target reservoir and when core hole is not configured, then can have by being configured to core hole and with target reservoir
There is the oil reservoir of similar characteristics of reservoirs to obtain required rock core.And if target reservoir itself and with target reservoir have phase
When core hole is not configured like the oil reservoir of characteristics of reservoirs, then the artificial rock that can characterize target reservoir reservoir characteristic can be chosen
The heart.
In the present embodiment, preferably according to oil and gas industry standard SY/T5345-2007, using steady state method or non-steady
State method distinguishes measuring and calculation water saturation sw, oil relative permeability KroAnd water phase relative permeability KrwEtc. data, and
Numerical fitting is carried out to these obtained data, so that building obtains water saturation sw, oil relative permeability KroAnd
Water phase relative permeability KrwBetween mathematical relationship, also can be obtained by oil corresponding to target reservoir as shown in Figure 4 in this way
Water phase percolation curve.
Certainly, in other embodiments of the invention, according to actual needs, can also be obtained using other rational methods
Grease phase percolation curve corresponding to target reservoir, the invention is not limited thereto.
Next, grease phase percolation curve is based on, according to pre- after getting grease phase percolation curve corresponding to target reservoir
If moisture content threshold value determines corresponding water saturation.
Specifically, in the present embodiment, above-mentioned preset moisture content threshold value is preferably configured to 99.9.Certainly, of the invention
In other embodiments, according to actual needs, above-mentioned preset moisture content threshold value is also configured as other reasonable values, and the present invention is unlimited
In this.For example, in other embodiments of the invention, above-mentioned preset moisture content threshold value can also carry out in section [99,100]
Value.
The water saturation is determined according to following expression (1):
Wherein, fwIndicate preset moisture content threshold value, sw1Indicate water saturation, kroIndicate oil relative permeability, krwTable
Show water phase relative permeability, μwIndicate water flooding viscosity, mPas, μoIndicate underground crude oil viscosity, mPas.
It should be pointed out that can also be constructed according to the functional relation (such as expression formula (1)) of moisture content and water saturation
Obtain the plot of water cut under the same coordinate system.It also can be obtained by curve synoptic diagram as shown in Figure 5 in this way.
Obtaining water saturation sw1Afterwards, according to water saturation sw1Determine residual oil saturation.According to water saturation
Relationship between residual oil saturation can determine residual oil saturation according to following expression:
so1=1-sw1(2)
Wherein, so1Indicate residual oil saturation.
Then, according to obtained actual residual oil saturation so1Residual oil saturation s after determining optimizationo1r。
In the present embodiment, it is contemplated that the anisotropic property of practical oil reservoir, in order to further increase the essence of water drive band identification
Degree and accuracy, this method preferably can be with actual residual oil saturation so1On the basis of, by the reference of residual oil saturation
It is worth floating special value, thus the residual oil saturation s after being optimizedo1r.Exist:
so1r=(1+m) × so1(3)
Wherein, so1rResidual oil saturation after indicating optimization, m indicate default floating coefficient, so1Indicate actual residual oil
Saturation degree.Wherein, the value range for presetting floating Coefficient m includes [0,30%], that is to say, that according to actual needs, actual
Residual oil saturation can (value of i.e. default floating Coefficient m be directly as the basis for judging oil reservoir water drive belt type
Zero) it, can also be less than or equal to 1.3so1Other reasonable values (such as 1.05so1、1.10so1、1.15so1、1.20so1、
1.25so1Deng).
Referring to figure 5 and figure 6, the obtained residual oil saturation of this method is A point.
It should be pointed out that in other embodiments of the invention, it according to actual needs, can also be rationally square using other
Formula obtains grease phase percolation curve corresponding to target reservoir, and the invention is not limited thereto.For example, in one embodiment of the present of invention
In, grease phase percolation curve required for this method can also be constructed using empirical formula method or oil field data calculating method.
2, next, illustrating how to obtain leading edge oil saturation.
For overview, firstly, using accessed grease phase percolation curve, according to the function of moisture content and water saturation
Relationship constructs the plot of water cut (as shown in Figure 5 and Figure 6) under the same coordinate system；Using irreducible water saturation as starting point, Xiang Hanshui
Rate curve makees tangent line, determines water saturation corresponding to the point of contact, obtains waterflood front water saturation；Before water drive
Edge water saturation determines leading edge oil saturation.
Specifically, as shown in fig. 6, by making the available point of contact of tangent line (such as B point) to plot of water cut, then by
The point of contact to the X-axis of phase percolation curve make vertical line and and X-axis compared to C point, needed for water saturation corresponding to such C point is
The waterflood front water saturation s wantedw2。
Certainly, in other embodiments of the invention, this method can also determine above-mentioned water using other rational methods
Drive leading edge water saturation sw2, the invention is not limited thereto.
In the present embodiment, waterflood front water saturation s is being obtainedw2Afterwards, determine that leading edge contains by following expression
Oily saturation degree:
so2=1-sw2(4)
Wherein, so2Indicate leading edge oil saturation.Such as the C point in Fig. 6.
In this step, by the remaining oil saturation in each region of the target reservoir reservoir and residual oil saturation and before
Edge oil saturation compares, and the water drive belt type of oil reservoir is determined according to comparison result.
According to the different level water drive band criteria for classifying, by the live core oil saturation analysis in 756 pieces of somewhere, knot
Fruit is as shown in Figure 3.By Fig. 3 it can be found that there is 171 pieces of core oil saturations to be less than or close to residual oil saturation, account for overall
Nearly 22.62%, extreme water-flushed zone can be divided into；Oil saturation is in average oil saturation and residual oil saturation (Sor) it
Between the rock core in region account for overall 68.52%, strong watered-out zone can be divided into；Oil saturation in average oil saturation and
Rock core between initial oil saturation accounts for 8.86%, can be divided into weak aquifer drive band.By comparing the oil field well core hole
Well log interpretation Tu Ke get, the embodiment of the present invention propose the different level water drive bands based on remaining oil saturation the criteria for classifying and
The result of log interpretation of live core hole is coincide, it was demonstrated that this criteria for classifying is correct.
Then, in step S120 (step 2), when the target reservoir reservoir includes extreme water-flushed zone, then according to the pole
The reservoir characteristic parameter of end water-flushed zone determines corresponding stifled tune system and system dosage.Wherein, reservoir characteristic parameter include but
It is not limited to: reservoir temperature, core intersection, formation water salinity, underground crude oil viscosity, extreme water-flushed zone permeability and porosity.
Although being also possible that other kinds of water-flushed zone in target reservoir, the present invention is not directed to these water-flushed zones
Stifled tune be illustrated, only illustrate the stifled tune scheme of extreme water-flushed zone.
Fig. 2 is the flow diagram of the stifled tune method for the extreme water-flushed zone in the criteria for classifying of the embodiment of the present application.
Illustrate each step of the stifled tune method for extreme water-flushed zone below with reference to Fig. 2.
Step S1201 determines the stifled tune system for closure for extreme water-flushed zone.
Specifically, need to carry out high-intensitive closure for extreme water-flushed zone, according to reservoir temperature, formation water salinity and pole
Water-flushed zone permeability is held to select stifled tune system.In the present embodiment, block up tune system preferably can be high molecular polymerization species,
Microballoon class, organic-inorganic discontinuous phase particulate species block system.The technical indicator of this kind of closure system is system in target reservoir
Sealing ratiod in porous media is greater than or equal to specified sealing ratiod, and validity period also just needs more than specified duration.For example, this
In embodiment, occluding body used by this method ties up to the sealing ratiod in target reservoir porous media more than or equal to 80%, has
The effect phase was at 12 months or more.
Then, in step S1202, according to the porosity of the best block-up position and extreme water-flushed zone determined come really
Surely system dosage is blocked.
For example, can determine closure system dosage using following expression:
Wherein, VfIndicate closure system dosage, RfIndicate that best block-up position, H indicate core intersection, hjIndicate extreme water
Wash the volume accounting of band, φjIndicate the porosity of extreme water-flushed zone.
The porosity φ of extreme water-flushed zonejThe core hole of target area be can use to obtain.
Best block-up position can determine as follows: determine closure system to extreme using physical simulation experiment
The obtained different type of physical analogy is blocked system to extreme water-flushed zone reservoir core by the sealing ratiod of water-flushed zone reservoir core
Sealing ratiod be input in the numerical simulator for meeting target reservoir reservoir characteristics, with ratio for input and output maximum under target oil price
For judgment basis, best blocking radius is determined, using the best blocking radius as best block-up position.
Specifically, firstly, determining closure of the closure system to extreme water-flushed zone reservoir core using physical simulation experiment
Rate.The natural core or artificial core that can represent the extreme water-flushed zone reservoir characteristics of oil reservoir are chosen, indoor physical simulation reality is passed through
The sealing ratiod determined under the conditions of different occluding bodies tie up to various concentration to rock core is tested, closures system type is above-mentioned polyphosphazene polymer
Species, microballoon class, organic-inorganic discontinuous phase particulate species system are closed, but not limited to this.
Secondly, determining that different type occluding body ties up to the scheme under various concentration and blocking radius.Foundation meets oil reservoir storage
The numerical simulator of layer feature, extreme water-flushed zone, strong watered-out zone, the permeability of weak aquifer drive band, porosity, remaining oil saturation
Degree can with oil reservoir is practical is consistent, the obtained different type of physical analogy is blocked into system to the envelope of extreme water-flushed zone reservoir core
Stifled rate is input in model, can specifically be realized by way of modifying extreme water-flushed zone reservoir permeability, the infiltration modified
Rate range can from well end in a manner of cylindrical radius to oil well end extend, such as 10m, 30m, 50m, 70m, 90m,
105m ... etc..
Finally, being up to principle with ratio for input and output determines best blocking radius.It is simulated by above-mentioned different schemes and calculates pole
The oil production at oil well end after holding water-flushed zone to block, the oil production of oil well subtracts oil production when not blocking scheme i.e. under each scheme
For oil increment, the output value of oil increment is calculated according to target oil price, which is output value；Calculate institute under different blocking radius schemes
Using expense input by plug agent amount, which is input.Output value under each scheme is made into ratio with input, works as production
Scheme when input ratio maximum is optimal case out, and the corresponding blocking radius of optimal case is best blocking radius.
Certainly, in other embodiments of the invention, this method can also determine occluding body using other rational methods
System and/or system dosage, the invention is not limited thereto.
In the present embodiment, after determining stifled tune system and system dosage, in step S130 (step 3), based on stifled
Tune system and system dosage carry out stifled tune to the well section and depth (also referred to as best blocking radius) of the extreme water-flushed zone.
Preferably stifled tune system can be injected into stratum according to above-mentioned system dosage to preset discharge capacity, to realize to mesh
Mark the stifled tune in region.For example, can use ground injection pump for closure system with 4~12m3The discharge capacity of/h is injected into stratum.Envelope
After the completion of stifled system injection, the closure system in pit shaft is headed into stratum, subsequent Hou Ning 2~5 days preferably by oil field water.In this way
Also the closure to this section of extreme water-flushed zone is just completed.
Certainly, in other embodiments of the invention, stifled tune system is being injected into the row that stratum uses by this method
Hou Ning duration after the completion of amount and injection can also be configured to other reasonable values according to actual needs, the present invention not to this into
Row limits.
Example
A specific example is set forth below in specific method in order to better illustrate the present invention.
There is a ultra-high water cut reservoir composite water cut 98%, 65 DEG C of reservoir temperature, core intersection 10m, formation water salinity
10000mg/L, underground crude oil viscosity 60mPas, it is bottom-up to be divided into extreme water-flushed zone, strong watered-out zone and weak aquifer drive band,
Wherein extreme water-flushed zone permeability is 5000 × 10-3μm2, porosity 34%, volume accounting 15%；Watered-out zone permeability is by force
3000×10-3μm2, porosity 32%, volume accounting 70%；Weak aquifer drive band permeability is 1000 × 10-3μm2, porosity is
30%, volume accounting 15%, different level water drive bands distributions are as shown in Figure 7 between well.
For taking a quarter five-spot pattern, water injection well an A, a producing well B, well spacing 300m, in Ng53Series of strata.
It is illustrated so that closure system is polymerization species Polymer Systems as an example.
(1) best blocking radius determines jointly according to indoor physical simulation and numerical simulation.
Firstly, determining closure system to the sealing ratiod of extreme water-flushed zone rock core.
The natural core that can represent the extreme water-flushed zone reservoir characteristics of oil reservoir is chosen, permeability is about 5000 × 10-3μm2,
Porosity is 34%, is saturated block crude oil, and water drive to core oil saturation is residual oil saturation to 25%.Pass through indoor object
It manages simulated experiment and determines and polymerize species Polymer Systems under the conditions of various concentration to the sealing ratiod of rock core, wherein polymerization species are high
The formulation selection of molecular system is polymer: the concentration of crosslinking agent is set as 3000mg/L:2000mg/L, 3000mg/L:3000mg/
L, 4000mg/L:2000mg/L, 4000mg/L:3000mg/L, 4000mg/L:4000mg/L, 5000mg/L:3000mg/L,
5000mg/L:4000mg/L.The polymerization species macromolecule of various concentration proportion is blocked system to be injected into rock core, injection rate is
1 times of pore volume distinguishes water drive, calculates the permeability of rock core after Hou Ning 3 days, the permeability by blocking front and back, which determines, to be blocked
Rate.As a result such as following table.
Reservoir core plugging rate results of Physical under various concentration
Secondly, determining that different type occluding body ties up to the scheme under various concentration and blocking radius.
The numerical simulator for meeting oil reservoir feature is established, X-direction Gridding length is 5m, Y-direction grid in model
Length is 5m, and Z-direction Gridding length is 0.5m, and longitudinal overall thickness is 10m.Wherein extreme water-flushed zone permeability is 5000 × 10-3μ
m2, porosity 34%, oil saturation is less than or equal to 25%, with a thickness of 1.5m；Strong watered-out zone permeability is 3000 × 10-3μ
m2, porosity 32%, oil saturation 25-45%, with a thickness of 7m；Weak aquifer drive band permeability is 1000 × 10-3μm2, hole
Degree is 30%, and oil saturation is more than or equal to 45%, with a thickness of 1.5m.By the obtained closure system of physical analogy to extreme water
It washes the sealing ratiod with reservoir to be input in model, can specifically be realized by way of modifying extreme water-flushed zone reservoir permeability,
The permeability range modified can from well end in a manner of cylindrical radius to oil well end extend, such as 10m, 30m, 50m,
70m, 90m, 105m, 120m etc..
Extreme water-flushed zone grid permeability assignment of the system under various concentration and blocking radius
Finally, being up to principle with ratio for input and output determines best blocking radius.It is simulated by above-mentioned different schemes and calculates pole
The oil production at oil well end after holding water-flushed zone to block, the oil production of oil well subtracts oil production when not blocking scheme i.e. under each scheme
For oil increment, the output value of oil increment is calculated according to target oil price, which is output value；Calculate institute under different blocking radius schemes
Using expense input by plug agent amount, which is input.Output value under each scheme is made into ratio with input, works as production
Scheme when input ratio maximum is optimal case out, and the corresponding blocking radius of optimal case is best blocking radius (depth).Mould
Quasi- calculated result see the table below.
Ratio for input and output value of the system under various concentration and blocking radius (target oil price is 50 $/bbl)
As can be seen from the table, work as polymer: the concentration of crosslinking agent is 4000mg/L:3000mg/L, and blocking radius is
When 105m, output investment is up to 1.52:1, determines that the blocking radius 105m under the program is best blocking radius.
Other kinds of closure system and best blocking radius determine that method is same as mentioned above.
(2) the extreme water-flushed zone system dosage that live injection rate is blocked needed for being calculated using volumetric method, blocking distance is 105
Rice, calculation formula are as follows:
Wherein VfBlock system dosage, m3；
RfBest block-up position, value 105m；
H- core intersection, value 10m；
hjExtreme water-flushed zone volume accounting, value 15%；
φjExtreme water-flushed zone porosity, value 34%.
Being computed extreme water-flushed zone and blocking system dosage is 17656m3。
(3) according to system preferred result, the system formulation of selective polymer high score subclass is polymer: the concentration of crosslinking agent
System is blocked as extreme water-flushed zone for 4000mg/L:3000mg/L.
(4) utilize ground injection pump by 17656m3Polymer gel system is with discharge capacity 4-12m3/ h injects stratum, system note
Blocking agent in pit shaft is headed into stratum using oil field water after the completion of entering, then Hou Ning 2-5 days.
It should be understood that disclosed embodiment of this invention is not limited to processing step disclosed herein, and should prolong
Reach the equivalent substitute for these features that those of ordinary skill in the related art are understood.It is to be further understood that using herein
Term be used only for the purpose of describing specific embodiments, and be not intended to limit.
" one embodiment " or " embodiment " mentioned in specification means the special characteristic described in conjunction with the embodiments, structure
Or characteristic is included at least one embodiment of the present invention.Therefore, the phrase " reality that specification various places throughout occurs
Apply example " or " embodiment " the same embodiment might not be referred both to.
Although above-mentioned example is used to illustrate principle of the present invention in one or more application, for the technology of this field
For personnel, without departing from the principles and ideas of the present invention, hence it is evident that can in form, the details of usage and implementation
It is upper that various modifications may be made and does not have to make the creative labor.Therefore, the present invention is defined by the appended claims.
Claims (10)
1. a kind of stifled tune method for ultra-high water cut stage oil reservoir, this method comprises:
Step 1: determining that the water drive belt type of target reservoir reservoir, the water drive belt type include according to remaining oil distribution feature
Extreme three water-flushed zone, strong watered-out zone and weak aquifer drive band levels, the water logging of the extreme water-flushed zone, strong watered-out zone and weak aquifer drive band
Degree is successively successively decreased；
Step 2: when the target reservoir reservoir includes extreme water-flushed zone, then according to the reservoir characteristic parameter of the type water-flushed zone
Determine corresponding stifled tune system and system dosage；
Step 3: carrying out stifled tune to the well section and depth of the extreme water-flushed zone based on the stifled tune system and system dosage.
2. stifled tune method according to claim 1, which is characterized in that in said step 1, by the target reservoir reservoir
The remaining oil saturation in each region compared respectively with residual oil saturation and leading edge oil saturation, it is true according to comparison result
The water drive belt type of the fixed oil reservoir, in which:
If remaining oil saturation is less than or equal to residual oil saturation, which is extreme water-flushed zone；
If remaining oil saturation, between residual oil saturation and leading edge oil saturation, which is strong watered-out zone；
If remaining oil saturation is greater than or equal to leading edge oil saturation, which is weak aquifer drive band.
3. stifled tune method according to claim 2, which is characterized in that determine the residual oil in each region as follows
Saturation degree,
Obtain grease phase percolation curve corresponding to target reservoir；
Based on the grease phase percolation curve, corresponding water saturation is determined according to the preset moisture content threshold value, according to institute
It states water saturation and determines residual oil saturation.
4. stifled tune method according to claim 3, which is characterized in that determined according to following expression described containing water saturation
Degree:
Wherein, fwIndicate preset moisture content threshold value, sw1Indicate water saturation, kroIndicate oil relative permeability, krwIndicate water
Phase relative permeability, μwIndicate water flooding viscosity, μoIndicate underground crude oil viscosity.
5. stifled tune method according to claim 4, which is characterized in that determine that the residual oil is saturated according to following expression
Degree:
so1r=(1+m) × so1
Wherein, so1rResidual oil saturation after indicating optimization, m indicate default floating coefficient, so1Indicate actual residual oil saturation
Degree, so1=1-sw1, wherein the value range of default floating Coefficient m includes [0,30%].
6. the stifled tune method according to any one of claim 2~5, which is characterized in that described in determining as follows
Leading edge oil saturation,
Same coordinate is constructed according to the functional relation of moisture content and water saturation using accessed grease phase percolation curve
Plot of water cut under system；
Using irreducible water saturation as starting point, Xiang Suoshu plot of water cut makees tangent line, determines corresponding to the point of contact containing water saturation
Degree, obtains waterflood front water saturation；
Leading edge oil saturation is determined according to the waterflood front water saturation.
7. described in any item stifled tune methods according to claim 1~6, which is characterized in that in the step 2,
Stifled tune system dosage is determined according to the porosity of best block-up position and extreme water-flushed zone.
8. the method according to the description of claim 7 is characterized in that determining the stifled tune system dosage according to following expression:
Wherein, VfIndicate stifled tune system dosage, RfIndicate that best block-up position, H indicate core intersection, hjIndicate extreme water-flushed zone
Volume accounting, φjIndicate the porosity of extreme water-flushed zone.
9. according to the method described in claim 8, it is characterized in that, determine best block-up position as follows,
Determine that closure system, will be obtained by physical analogy to the sealing ratiod of extreme water-flushed zone reservoir core using physical simulation experiment
Different type block system the number for meeting target reservoir reservoir characteristics is input to the sealing ratiod of extreme water-flushed zone reservoir core
It is worth in simulation model, using ratio for input and output maximum under target oil price as judgment basis, best blocking radius is determined, by the best envelope
Radius is blocked up as best block-up position.
10. method according to claim 1 to 9, which is characterized in that
The stifled tune system includes high molecular polymerization species, microballoon class, organic-inorganic discontinuous phase particulate species, and technical indicator is stifled
Sealing ratiod of the tune system in target reservoir porous media is more than or equal to 80%, and validity period is greater than 12 months or more.
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