CN105952427B - A kind of prediction of low-permeability oil deposit water filling induced fractures and evaluation method - Google Patents
A kind of prediction of low-permeability oil deposit water filling induced fractures and evaluation method Download PDFInfo
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Abstract
The invention discloses a kind of prediction of low-permeability oil deposit water filling induced fractures and evaluation methods, include the following steps：Identify individual well induced fractures；The determination of water filling induced fractures Forming Mechanism and Dominated Factors；Using the identification of individual well induced fractures and identified water filling induced fractures Forming Mechanism and Dominated Factors as foundation, water filling induced fractures are predicted；Finally evaluated according to prediction result.Evaluate influence of the water filling induced fractures to percolation in low permeability oil reservoir field and waterflooding extraction, it can predict the water filling induced fractures three dimensions Distribution Pattern formed during development of low-permeability oil reservoir, and influence of the water filling induced fractures to waterflood development of low-permeability reservoirs can be evaluated, authentic communication is provided for development of low-permeability oil reservoir, to reduce development of low-permeability oil reservoir risk cost, the waterflooding development effect of low-permeability oil deposit is effectively improved, recovery ratio is improved.
Description
Technical field
The invention belongs to oil-gas field development geology and reservoir engineering technical field, and in particular to a kind of low-permeability oil deposit water filling
The prediction of induced fractures and evaluation method.
Background technology
Low permeable oil and gas reservoirs are the important Oil-gas Accumulation Types of China's continental sedimentary basin, are had a very wide distribution, petroleum resources
It measures huge, is the mainstream of the main battle ground produced in China's Land petroleum increasing the storage and the following oil gas development.China's low-permeability oil deposit is to note
Based on water exploitation, waterflooding extraction for many years practice have shown that, due to low-permeability oil deposit reservoir matrix poor permeability, injection water is in shaft bottom
It is not easy to spread, causes its water injection pressure rate of climb fast.When water injection pressure is more than crack Opening pressure or formation fracture pressure
When, it is easy to cause intrinsic fracture opening, the main thoroughfare of water logging and water breakthrough is formed, the development effectiveness of low-permeability oil deposit is made to be deteriorated.
Water filling induced fractures are that low-permeability oil ensconces the new types of fractures formed in long-term the injecting process, are low-permeability oils
Ensconce exploitation middle and advanced stage occur a kind of new reservoir heterogeneity, influence low-permeability oil deposit middle and advanced stage development plan adjustment and
Recovery ratio.Prevent, predict and evaluate the water filling induced fractures that low-permeability oil deposit is formed during waterflooding extraction, it is hypotonic to instructing
The waterflooding extraction of saturating oil reservoir is particularly significant.
Application No. is the patent of invention of CN201410553929.7, disclose intrinsic fracture in a kind of oil-gas reservoir by stages,
It is divided into because of prediction and evaluation method, specific embodiment is：Obtain frac-pack object sample；Intrinsic fracture is carried out by stages to sample
Mating analysis；Carry out the memory phase time that Acoustic Emission of Rock experimental simulation restores rock rupture；Specify genetic type；Determination is naturally split
Formation phase and genetic type are stitched, the Reproducible ability in oil-gas reservoir is divided into multiple single phases time, single genetic type
Intrinsic fracture subsystem；Comprehensive superposition is carried out to the prediction result of each intrinsic fracture subsystem and forms prediction result；It will obtain
Prediction result compared and analyzed with fracture intensity.Using above-mentioned technical proposal, more phases time, multiple depot type are answered
Miscellaneous intrinsic fracture network system is determined by phase time stripping, genetic type is divided into secondary, single genetic type of single phase
Intrinsic fracture subsystem improves the precision predicted in oil-gas reservoir intrinsic fracture, but the patent is only as basic research object
Only disclose intrinsic fracture by stages, be divided into because of prediction and evaluation method, be not provided with low-permeability oil deposit water filling induced fractures
Prediction and evaluation method.
Invention content
In order to overcome the above problems of the prior art, it is proposed that a kind of low-permeability oil is ensconced during waterflooding extraction
Water filling induced fractures prediction and evaluation method, this water filling induced fractures be to be formed since water injection pressure is excessively high.It should
Method can predict that the water filling formed during development of low-permeability oil reservoir induces three dimensions Distribution Pattern, and can evaluate note
Influence of the water induced fractures to waterflood development of low-permeability reservoirs, authentic communication is provided for development of low-permeability oil reservoir, low to reduce
Oil reservoir development risk cost is permeated, recovery ratio is improved.
The present invention provides a kind of prediction technique of low-permeability oil deposit water filling induced fractures, includes the following steps：
Step (1)：Identify individual well induced fractures；
Step (2)：The determination of water filling induced fractures Forming Mechanism and Dominated Factors；
Step (3)：With the identification of individual well induced fractures and identified water filling induced fractures Forming Mechanism and Dominated Factors
For foundation, water filling induced fractures are predicted.
Preferably, in the step (1) identification individual well induced fractures according to water filling induced fractures dynamic response feature into
Row identification, dynamic response feature includes injection-production well Production development, production profile and intake profile monitoring, well testing test, tracer
At least one in monitoring, waterflood front monitoring or sealing core drilling test analysis or arbitrary combination.
Any of the above-described scheme is preferably, and the Forming Mechanism of water filling induced fractures includes the first shape in the step (2)
At mechanism, i.e., since water injection pressure is more than the Opening pressure of intrinsic fracture so that intrinsic fracture opens, extends and extend to form out
Large fracture is opened, water filling induced fractures are formed.The first Forming Mechanism is adapted to the feelings of water injection well surrounding formation intrinsic fracture development
Condition.
Any of the above-described scheme is preferably, and the Forming Mechanism of water filling induced fractures further includes second in the step (2)
Forming Mechanism, i.e., since water injection pressure is more than the hydraulic fracture of the fracture pressure formation on stratum.Second of Forming Mechanism is adapted to
In well surrounding formation the case where intrinsic fracture agensis.
Any of the above-described scheme is preferably, and the Forming Mechanism of water filling induced fractures further includes the third in the step (2)
Forming Mechanism, i.e., due to water injection pressure height, the unlatching crack for making artificial fracture open be formed.The third Forming Mechanism is adapted to note
Hydraulic fracturing has been carried out in well, and the people consistent with orientation of principal stress has been formd in well surrounding formation
The case where work pressure-break.
Any of the above-described scheme is preferably, and the condition that the first described Forming Mechanism forms water filling induced fractures is：
Pw＞ Pi
In formula：PwFor water injection pressure, units MPa；PiFor crack Opening pressure, units MPa；μ is Rock Poisson Ratio Using, immeasurable
Guiding principle；H is crack buried depth, unit km；θ is fracture dip, unit degree；ρSFor rock unit weight, unit 103kg/m3；ρWFor water
Proportion, unit 103kg/m3；fσ1、fσ3The respectively maximum principal stress of Present Stress Field and minimum principal stress gradient, unit
MPa/km；β is the angle in present daygeodynamics direction and intrinsic fracture trend, unit degree.
Any of the above-described scheme is preferably, and the condition that second of Forming Mechanism forms water filling induced fractures is：
Pw>3Hfσ3-Hfσ1–P0+St
In formula, P0For strata pressure, units MPa；StFor the tensile strength of rock, units MPa；H is water filling depth of stratum,
Unit km；fσ1、fσ3The respectively maximum principal stress of Present Stress Field and minimum principal stress gradient, units MPa/km.
Any of the above-described scheme is preferably, and the condition that the third described Forming Mechanism forms water filling induced fractures is：Pw>Pc
Or
In formula, PcFor the clossing pressure in crack, units MPa；μ is the Poisson's ratio of rock, dimensionless；H is burying for pressure-break
Hide depth, unit km；ρSFor the unit weight of overlying rock, unit 103kg/m3；σ3For the minimum principal stress size of Present Stress Field,
Units MPa；P0For strata pressure, units MPa.
Any of the above-described scheme is preferably, and the Dominated Factors of step (2) the water filling induced fractures include intrinsic fracture, people
Work crack, present daygeodynamics, reservoir rock mechanical property or rock brittleness, crack Opening pressure, formation fracture pressure, single sand body
It spread and its at least one of the matching relationship of intrinsic fracture, water injection rate, water injection pressure, water injection time or arbitrarily combines.
Any of the above-described scheme is preferably, and the step (3) is lured with the identification of individual well induced fractures and identified water filling
It is foundation to lead cracking mechanism and Dominated Factors, and water filling induced fractures are predicted using water filling rupture index method.
Any of the above-described scheme is preferably, and the water filling rupture index method is expressed as：
In formula,
Pp=Pi
Or Pp=3Hf σ3-Hfσ1–P0+St
Or Pp=Pc
Or
In formula, IFI is water filling rupture index, dimensionless；PwsFor flowing bottomhole pressure (FBHP), units MPa, q is water injection rate, unit m3/
D, μ are viscosity, and units MPa s, B are volume factor, dimensionless, k1、k2For permeability, unit μm2, h is effective pay thickiness,
Unit m, rfFor inner region radius, unit m, riFor outskirt radius, unit m, rwFor well head radius, when unit m, Δ t are that closing well restores
Between, unit s,For porosity, dimensionless, CtFor the compressed coefficient, dimensionless.
Any of the above-described scheme is preferably, and works as Pp=PiWhen for water filling induced fractures the first Forming Mechanism.
Any of the above-described scheme is preferably, and works as Pp=3Hf σ3-Hfσ1–P0+StFor second of formation machine of water filling induced fractures
System.
Any of the above-described scheme is preferably, and works as Pp=PcOrWhen lured for water filling
Lead the third Forming Mechanism in crack.
Any of the above-described scheme is preferably, and as IFI ＞ 1, shows that water filling induced fractures have begun to be formed；IFI≤1, table
Bright water filling induced fractures are not yet formed.
The present invention also provides a kind of evaluation methods of low-permeability oil deposit water filling induced fractures, use any of the above-described first
The low-permeability oil deposit water filling induced fractures prediction technique is predicted, is then evaluated according to prediction result.
Preferably, specific evaluation method is included in the prediction of water filling induced fractures and establishes water filling induced fractures growth mould
On the basis of type, using Research Numerical Simulation Techique, analysis water filling induced fractures are formed and expansion process middle and low permeable reservoir
The dynamic rule of seepage field and pressure field evaluates water filling induced fractures percolation ability and to waterflood development of low-permeability reservoirs
It influences.
The present invention provides prediction and the evaluation method of a kind of low-permeability oil deposit water filling induced fractures, can predict in hyposmosis
The water filling formed during oil reservoir development induces three dimensions Distribution Pattern, and can evaluate water filling induced fractures to low-permeability oil
Hide waterflooding extraction influence, provide authentic communication for development of low-permeability oil reservoir, to reduce development of low-permeability oil reservoir risk at
This, improves recovery ratio, effectively improves the waterflooding development effect of low-permeability oil deposit, low-permeability oil deposit can be predicted and be evaluated to this method
The forming process and its Evolution of water filling induced fractures in the process of development can be opening for low-permeability oil deposit high water cut rate
Hair project setting provides important directive function and geologic basis.
Description of the drawings
Fig. 1 is the fitted figure of oilfield well testing data；
Fig. 2 water injection well different time intake profiles；
Fig. 3 water injection wells and surrounding oil well are shown in the Production development curve graph of tracer；
The waterflood layer positions Fig. 4 A1 and its corresponding petrophysical parameter, crustal stress and intrinsic fracture distribution map；
Fig. 5 water filling induced fractures forecast of distribution figures；
The comparison diagram that the speed of growth of Fig. 6 water filling induced fractures influences waterflood sweep efficiency；
Comparison diagram of Fig. 7 water filling induced fractures speeds of growth to recovery percent of reserves；
The prediction of Fig. 8 low-permeability oil deposit water filling induced fractures and evaluation rubric figure.
Specific implementation mode
In order to be best understood from technical scheme of the present invention and advantage, the present invention is done into one below by way of specific implementation mode
Walk explanation.
The first step：The identification of individual well induced fractures.The formation of water filling induced fractures is a dynamic process, can pass through note
Adopt well Production development, production profile and intake profile monitoring, well testing test, tracer monitoring, waterflood front monitoring etc. data into
Row identification and characterization.For example, as shown in Figure 1, the fitted figure for oilfield well testing data shows on well testing test interpretation curve
For typical dual media type.As shown in Fig. 2, having been shown bright in terms of different time intake profile monitoring result from water injection well
The aobvious needle pattern water-absorption characteristics gradually increased, illustrate that the well group have passed through long-time waterflooding extraction, are showed near water injection well
Go out slit formation water stream channel feature so that water suction layer thickness is gradually reduced and water absorption constantly increases, and most of water edge of injecting is split
Stitch water breakthrough, the serious feature of water flooding in heterogeneous.
From the tracer breakthrough time of inter-well test, leading edge water-front advance velocity, tracer with respect to the rate of extraction and water filling point
High permeability zone has apparent direction characteristic between can be seen that the low-permeability oil deposit well of tracer reflection with data such as rates.Such as
Shown in Fig. 3, typical " step " slit formation water breakthrough characteristics are can be seen that from the well water of advantage seepage direction, and other sides
It is " gradual " porosity water breakthrough characteristics to oil well.
As shown in figure 4, from the sealing core drilling test analysis of the main inspection shaft (A1 oil wells) for oozing direction, the well core intersection
22.0 meters, wherein washing thickness is 10.7m, water out thickness accounts for the 48% of overall thickness, shows that water flooding degree is stronger in fractuer direction.
And it is 20m that crack lateral, which is core intersection, washes thickness 7.8m, water out thickness accounts for the 39% of oil reservoir overall thickness；It is vertical main
Core intersection about 15m on direction is oozed, thickness 3.7m is washed, water out thickness accounts for the 25% of oil reservoir overall thickness, main seepage flow fractuer direction
Waterflood ratio is apparently higher than the water out thickness in lateral and vertical direction, also turns out and has been formed to main seepage direction in NE
Water filling induced fractures.The intrinsic fracture of Water Flooding Layer position corresponding position is developed, and rock brittleness index is big, and crustal stress value is smaller.
Second step：The determination of water filling induced fractures Forming Mechanism and Dominated Factors.During water filling induced fractures are with water injection well
The heart initially forms, and gradually to extension around well and extends.According to Geological Feature of Low Permeability Reservoir and waterflooding extraction feature
Analysis, and to the system comparative study of profile-log of water injection and its longitudinal geologic parameter, water filling induced fractures mainly have following
Three classes kind Forming Mechanism：
The first Forming Mechanism is since water injection pressure is more than the Opening pressure of intrinsic fracture so that intrinsic fracture opening,
Unlatching large fracture is extended and extended to form, water filling induced fractures are formed.This kind of Forming Mechanism mainly adapts to water injection well surrounding formation
The case where intrinsic fracture is developed.Form the condition of water filling induced fractures：
Pw＞ Pi
In formula：PwFor water injection pressure, units MPa；PiFor crack Opening pressure, units MPa；μ is Rock Poisson Ratio Using, immeasurable
Guiding principle；H is crack buried depth, unit km；θ is fracture dip, unit degree；ρSFor rock unit weight, unit 103kg/m3；ρWFor water
Proportion, unit 103kg/m3；fσ1、fσ3The respectively maximum principal stress of Present Stress Field and minimum principal stress gradient, unit
MPa/km；β is the angle in present daygeodynamics direction and intrinsic fracture trend, unit degree.
Second of Forming Mechanism is since water injection pressure is more than the hydraulic fracture of the fracture pressure formation on stratum.This kind of formation
Mechanism mainly adapts to the case where intrinsic fracture agensis in well surrounding formation.Form the condition of water filling induced fractures：
Pw>3Hfσ3-Hfσ1–P0+St
In formula, P0For strata pressure, units MPa；StFor the tensile strength of rock, units MPa；H is water filling depth of stratum,
Unit km；fσ1、fσ3The respectively maximum principal stress of Present Stress Field and minimum principal stress gradient, units MPa/km.
The third Forming Mechanism is the unlatching crack for making artificial fracture open be formed due to water injection pressure height.This kind of formation
Mechanism mainly adapts to water injection well and hydraulic fracturing has been carried out, and has formd in well surrounding formation and answered with maximum horizontal master
The case where force direction consistent artificial fracture.Form the condition of water filling induced fractures：
Pw>Pc
Or
In formula, PcFor the clossing pressure in crack, units MPa；μ is the Poisson's ratio of rock, dimensionless；H is burying for pressure-break
Hide depth, unit km；ρSFor the unit weight of overlying rock, unit 103kg/m3；σ3For the minimum principal stress size of Present Stress Field,
Units MPa；P0For strata pressure, units MPa.
The practical geology reservoir of different regions is different, and the Forming Mechanism of water filling induced fractures is also not exactly the same.Example
Such as, the long low-permeability oil deposit of Ordos Basin is based on the first Forming Mechanism.
The governing factor of water filling induced fractures includes mainly intrinsic fracture, man-made fracture, present daygeodynamics, reservoir rock power
It learns property or rock brittleness, crack Opening pressure is closed with formation fracture pressure, single sand body spread and its with the matching of intrinsic fracture
The factors such as system, water injection rate, water injection pressure, water injection time.
Third walks：The prediction of water filling induced fractures.According to the Forming Mechanism of low-permeability oil deposit water filling induced fractures and its master
Want governing factor, it is proposed that predict the note in the low-permeability oil deposit different injection development phase using water filling rupture index method (IFI)
Spread and its changing rule of the water induced fractures on longitudinal direction and plane.Water filling rupture index prediction technique can be expressed as：
In formula,
Pp=Pi(the first Forming Mechanism)
Or Pp=3Hf σ3-Hfσ1–P0+St(second of Forming Mechanism)
Or Pp=Pc(the third Forming Mechanism)
(the third Forming Mechanism)
Here, PwsFor flowing bottomhole pressure (FBHP), units MPa, q is water injection rate, unit m3/ d, μ are viscosity, and units MPa s, B are body
Product coefficient, dimensionless, k1、k2For permeability, unit μm2, h is effective pay thickiness, unit m, rfFor inner region radius, unit m, ri
For outskirt radius, unit m, rwFor well head radius, unit m, Δ t are closing well recovery time, unit s,For porosity, dimensionless,
CtFor the compressed coefficient, dimensionless.
In the water filling induced fractures prediction of different origins mechanism, PpMeaning and its acquisition methods it is different.
IFI ＞ 1 show that water filling induced fractures have begun to be formed；IFI≤1 shows that water filling induced fractures are not yet formed,
Therefore, IFI is more than 1 region, is the distributed area of water filling induced fractures.
4th step：Evaluate influence of the water filling induced fractures to percolation in low permeability oil reservoir field and waterflooding extraction.It is induced in water filling
It the prediction in crack and establishes on the basis of water filling induced fractures growth model, using Research Numerical Simulation Techique, analysis water filling lures
The seepage field of cracking initiation and expansion process middle and low permeable reservoir and the dynamic rule of pressure field are led, evaluation water filling induction is split
Percolation ability and the influence to waterflood development of low-permeability reservoirs are stitched, countermeasure is adjusted for low-permeability oil deposit high water cut rate development plan
Geological theory foundation is provided.
The prediction of low-permeability oil deposit water filling induced fractures and evaluation rubric are as shown in Figure 8.
The prediction of low-permeability oil deposit water filling induced fractures provided by the invention and evaluation method, may be implemented to low-permeability oil
Hide waterflooding extraction during formed water filling induced fractures on longitudinal direction and plane the quantitative forecast of Distribution Pattern and to develop shadow
Loud evaluation, for the waterflood development of low-permeability reservoirs middle and later periods development plan adjustment and improve recovery ratio provide geological theory according to
According to new approach, can be widely applied to China's development of low-permeability oil reservoir plan implementation and adjustment in, be China's low-permeability oil
It hides high efficient rational development and improves recovery ratio and provide technical support.
The present invention provides prediction and the evaluation method of a kind of low-permeability oil deposit water filling induced fractures, including：(1) according to water filling
Induced fractures dynamic response feature utilizes the distribution of dynamic approach identification individual well induced fractures in the longitudinal direction；(2) determine that water filling lures
Lead the Forming Mechanism and its major control factors in crack；(3) spread of the quantitative forecast water filling induced fractures on longitudinal direction and plane
Rule；(4) influence of the evaluation water filling induced fractures to percolation in low permeability oil reservoir field and waterflooding extraction realizes low-permeability oil deposit note
The prediction and evaluation of the induced fractures generated in water development process.For example, in the low-permeability oil deposit of Ordos Basin, this is utilized
The above method provided is provided, distribution and the feature of water filling induced fractures are identified using the Production development data of oil reservoir development,
Water filling induced fractures Forming Mechanism and Dominated Factors are determined, as shown in Figure 1, Figure 2, Figure 3, Figure 4, predict 8 water filling inductions
The planar distribution and its scale in crack, as shown in figure 5, having rated the growth of water filling induced fractures to seepage field and exploitation
Influence, as a result as shown in Figure 6 and Figure 7, the speeds of growth of water filling induced fractures influence low-permeability oil deposit floood conformance volume and
Ultimate recovery, under the conditions of identical well pattern, the speed of growth of water filling induced fractures is slower, waterflood sweep efficiency and adopts
Yield is higher, and the adjustment countermeasure for the oil reservoir development high water cut rate development plan provides geological theory foundation, to reduce
Development risk cost.
It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It is still
Either which part or all technical features can be carried out so that technical scheme described in the above embodiments is modified
Equivalent replacement；And these modifications or replacements, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (10)
1. a kind of prediction technique of low-permeability oil deposit water filling induced fractures, includes the following steps：
Step (1)：Identify that individual well induced fractures, identification individual well induced fractures are carried out according to water filling induced fractures dynamic response feature
Identification, dynamic response feature include injection-production well Production development, production profile and intake profile monitoring, well testing test, tracer prison
At least one in survey, waterflood front monitoring or sealing core drilling test analysis or arbitrary combination；
Step (2)：The determination of water filling induced fractures Forming Mechanism and Dominated Factors, the Forming Mechanisms of water filling induced fractures include the
A kind of Forming Mechanism, i.e., since water injection pressure is more than the Opening pressure of intrinsic fracture so that intrinsic fracture opens, extends and extends
It is formed and opens large fracture, form water filling induced fractures；The Forming Mechanism of water filling induced fractures further includes second of Forming Mechanism, i.e.,
The hydraulic fracture formed due to the fracture pressure that water injection pressure is more than stratum；The Forming Mechanism of water filling induced fractures further includes third
Kind Forming Mechanism, i.e., due to water injection pressure height, the unlatching crack for making artificial fracture open be formed；
Step (3)：With the identification of individual well induced fractures and identified water filling induced fractures Forming Mechanism and Dominated Factors be according to
According to prediction water filling induced fractures, with the identification of individual well induced fractures and identified water filling induced fractures Forming Mechanism and master control
Factor is foundation, predicts that water filling induced fractures, water filling rupture index method are expressed as using water filling rupture index method：
In formula,
Pp=Pi
Or Pp=3Hf σ3‐Hfσ1–P0+St
Or Pp=Pc
Or
In formula, PwsFor flowing bottomhole pressure (FBHP), q is water injection rate, and μ is viscosity, and B is volume factor, k1、k2For permeability, h is that oil reservoir is effective
Thickness, rfFor inner region radius, riFor outskirt radius, rwFor well head radius, Δ t is closing well recovery time,For porosity, CtFor pressure
Contracting coefficient.
2. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that it is described the first
Forming Mechanism formed water filling induced fractures condition be：
Pw＞ Pi
In formula：PwFor water injection pressure；PiFor crack Opening pressure；μ is Rock Poisson Ratio Using；H is crack buried depth；θ inclines for crack
Angle；ρSFor rock unit weight；ρWFor the proportion of water；fσ1、fσ3Respectively maximum principal stress and the minimum principal stress ladder of Present Stress Field
Degree；β is the angle in present daygeodynamics direction and intrinsic fracture trend.
3. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that described second
Forming Mechanism formed water filling induced fractures condition be：
Pw>3Hfσ3‐Hfσ1–P0+St
In formula, P0For strata pressure；StFor the tensile strength of rock；H is water filling depth of stratum；fσ1、fσ3Respectively stress now
The maximum principal stress and minimum principal stress gradient of field.
4. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that it is described the third
Forming Mechanism formed water filling induced fractures condition be：
Pw>PcOr
In formula, PcFor the clossing pressure in crack；μ is the Poisson's ratio of rock；H is the buried depth of pressure-break；S is overlying rock
Unit weight；σ3For the minimum principal stress size of Present Stress Field；P0For strata pressure.
5. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that the step
(2) Dominated Factors of water filling induced fractures include intrinsic fracture, man-made fracture, present daygeodynamics, reservoir rock mechanical property or
Rock brittleness, crack Opening pressure, formation fracture pressure, single sand body spread and its with the matching relationship of intrinsic fracture, water injection rate,
At least one of water injection pressure, water injection time or arbitrary combination.
6. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that work as Pp=PiWhen
For the first Forming Mechanism of water filling induced fractures.
7. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that work as Pp=3Hf
σ3‐Hfσ1–P0+StFor second of Forming Mechanism of water filling induced fractures.
8. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that work as Pp=PcOrWhen for water filling induced fractures the third Forming Mechanism.
9. the prediction technique of low-permeability oil deposit water filling induced fractures as described in claim 1, which is characterized in that as IFI ＞ 1,
Show that water filling induced fractures have begun to be formed；IFI≤1 shows that water filling induced fractures are not yet formed.
10. a kind of evaluation method of low-permeability oil deposit water filling induced fractures uses in any of the above-described claim first
Low-permeability oil deposit water filling induced fractures prediction technique is predicted, is then evaluated according to prediction result, specific evaluation method
It is included in the prediction of water filling induced fractures and establishes on the basis of water filling induced fractures growth model, utilizes reservoir numerical simulation skill
Art, analysis water filling induced fractures are formed and the seepage field of expansion process middle and low permeable reservoir and the dynamic rule of pressure field,
Evaluate water filling induced fractures percolation ability and the influence to waterflood development of low-permeability reservoirs.
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