CN107044277A - Low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method - Google Patents
Low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method Download PDFInfo
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- 238000004088 simulation Methods 0.000 claims description 15
- 230000000977 initiatory effect Effects 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
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- 239000003209 petroleum derivative Substances 0.000 description 1
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B47/00—Survey of boreholes or wells
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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
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Abstract
The invention discloses low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method, comprise the following steps successively：1）Crack extended model, the first pressure break waterpower fracture parameters of inverting are set up using Meyer softwares；2）The heterogeneous geological model of oil reservoir is set up using reservoir numerical simulation software Eclipse, and first pressure break waterpower fracture parameters are implanted into heterogeneous geological model, Production development history matching is carried out, obtains remaining oil saturation and strata pressure field distribution；3）According to remaining oil saturation and strata pressure field distribution to horizontal well refracturing yield potential quantitative assessment, by first pressure break waterpower classification of rifts, specific aim refracturing mode is proposed.The problems such as present invention efficiently solves stress sensitivity phenomenon present in the evaluation of low permeable and heterogeneity reservoir horizontal well refracturing yield potential, refracturing mode specific aim is not strong, improve the effect of refracturing transformation, the risk of engineering construction is reduced, with wide market application foreground.
Description
Technical field
The present invention relates to a kind of low permeable and heterogeneity reservoir in natural petroleum gas field field, especially hydraulic fracturing field
Horizontal well refracturing yield potential evaluation method.
Background technology
China's major part low-permeability oil deposit has that reservoir properties are poor, anisotropism is strong, stress sensitivity is strong, natural production capacity is low
The features such as, its part oil reservoir can not form effective flooding pattern using conventional waterflooding exploitation, and use horizontal well many on a large scale
The many cluster volume fracturing technology elastic developments of section.But due to many factors such as geology and engineerings, first fracturing reform is insufficient and water
The reasons such as power crack failure cause production decline fast, have a strong impact on development effectiveness, in order to recover this kind of production well capacity, repeat
Fracturing technique is one of main well stimulation.
It is quantitative using the low permeable and heterogeneity reservoir of many cluster volume fracturings of horizontal well multistage for this kind of without flooding pattern
Evaluate refracturing yield potential and propose that specific aim refracturing mode is particularly important.Wherein first fracturing transformation effect, storage
Layer anisotropism, remaining oil saturation and strata pressure field distribution are the key factors that refracturing yield potential is evaluated.
The method of current low-permeability oil deposit horizontal well refracturing yield potential evaluation mainly has following several：
(1) a kind of (method for selecting fine and close oil-gas reservoir refracturing target well, the patent No. such as Wei Chenji：
201510324579.1) by determining to screen the completion efficiency of well and the unit reservoir quality of screening well, with unit reservoir quality
For abscissa, completion efficiency is that ordinate does scatter diagram, scatter diagram is divided into four parts using horizontal, vertical dividing line, formation crosses
Diagnostic graph, so as to complete the selection of refracturing target well, but only considered oil in place and completion efficiency to select to repeat to press
Target well is split, the factors such as strata pressure are have ignored.
(2) being permitted big vast magnitude, (a kind of low permeability gas reservoir turns to refracturing process, the patent No.：201510144184.3)
Process implementing process is divided into the first pressure break failure of analysis and evaluation before pressing or reason of inefficiency, refracturing well and story selecting is turned to
Decision-making, modeling Simulation turn to the change of refracturing stress field, and fracture geometry parameter is constructed with flow conductivity optimization, refracturing
The part of parameter designing three realizes that low permeability gas reservoir turns to refracturing technique, but does not account for the anisotropism of reservoir to residue
Oily distribution influence, without proposing specific aim refracturing mode for every section of hydraulic fracture.
(3) Pang Peng etc. (Pang Peng, Liu Zhenyu, king recklessly shake refracturings transformation opportunity numerical simulation [J] grand celebration petroleum geologies
With exploitation, 2015,34 (6):83-87) utilize the method for reservoir numerical simulation, it is considered to which fracture condudtiviy change is given birth to horizontal well
Dynamic effects are produced, preferably go out refracturing transformation opportunity, but do not account for influence of the hydraulic fracture true form to production capacity, so that
The field distribution of simulation remaining oil saturation, strata pressure field distribution and actual conditions differ greatly.
The anisotropism that the above method does not all account for reservoir carrys out research level well to remaining oil saturation field distribution influence
Refracturing yield potential is evaluated.The anisotropism that the present invention had both considered reservoir influences on remaining oil saturation field distribution,
The influence that strata pressure changes to hydraulic fracture flow conductivity in hydraulic fracture shape and production process is considered simultaneously, and is combined
The factors such as first pressure break waterpower fracture parameters, efficiently solve many cluster volume fracturing bullets of low permeable and heterogeneity reservoir horizontal well multistage
Property development late stage refracturing yield potential evaluate present in stress sensitivity phenomenon, refracturing mode specific aim it is not strong etc.
Problem.
The content of the invention
It is an object of the invention to provide a kind of low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation side
Method, principle is reliable, easy to operate, and the deficiencies in the prior art can be overcome using this method, improves the effect of refracturing transformation,
The risk of engineering construction is reduced, with wide market application foreground.
To reach above technical purpose, the present invention provides following technical scheme.
Low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method, comprises the following steps successively：
1) crack extended model, the first pressure break waterpower fracture parameters of inverting are set up using Meyer softwares；
2) the heterogeneous geological model of oil reservoir is set up using reservoir numerical simulation software Eclipse, and by first pressure break waterpower
Fracture parameters are implanted into heterogeneous geological model, carry out Production development history matching, obtain remaining oil saturation and strata pressure
Field distribution；
3) according to remaining oil saturation and strata pressure field distribution to horizontal well refracturing yield potential quantitative assessment,
By first pressure break waterpower classification of rifts, specific aim refracturing mode is proposed.
In the present invention, the step 1) crack extended model is set up using Meyer softwares, the first pressure break waterpower of inverting is split
Stitch parameter, including herein below：Reservoir rock mechanics parameter where collecting horizontal well, reservoir physical parameter, reservoir fluid parameter,
First pressing crack construction data, crack extended model is set up using Meyer softwares, and inverting obtains first pressure break waterpower fracture parameters,
Including fracture half-length Lf, slit width Wf, stitch high Hf, flow conductivity FRCD。
In the present invention, the step 2) set up the heterogeneous geological model of oil reservoir, and by first pressure break waterpower fracture parameters
Heterogeneous geological model is implanted into, Production development history matching is carried out, remaining oil saturation and strata pressure field distribution, bag is obtained
Include herein below：
(1) the heterogeneous geological model of oil reservoir is set up
Collect horizontal well where reservoir physical parameter, reservoir fluid parameter, well log interpretation data, obtain reservoir porosity,
Permeability, oil saturation, oil reservoir degree of burying, reservoir thickness, fluid high-pressure physical parameter, fluid phase percolation curve, utilize oil reservoir number
Value simulation softward Eclipse sets up the heterogeneous geological model of oil reservoir.
(2) first pressure break waterpower fracture parameters implantation
By step 1) in first pressure break waterpower fracture parameters be implanted into heterogeneous geological model, wherein hydraulic fracture flow conductivity
FRCDThe factor of two aspects is considered in heterogeneous geological model：Hydraulic fracture flow conductivity FRCDWith fracture half-length LfChange
With hydraulic fracture flow conductivity FRCDWith strata pressure p change.
1. hydraulic fracture flow conductivity FRDCWith fracture half-length LfChange, waterpower is split during conventional reservoir numerical simulation
Slit shape considers rectangular, and hydraulic fracture flow conductivity does not change with fracture half-length.And the shape of actual hydraulic fracture
Shape is wedge shape in reservoir, and its flow conductivity is changed with fracture half-length, therefore hydraulic fracture is considered into wedgewise so that pressure break
Horizontal well Production development is simulated and prediction more conforms to reality.
According to Soliman (Numerical Models Estimates Fracture Production Increase
[J] .Oil and Gas, 1986,84:41(41):70-74) result of study, hydraulic fracture flow conductivity with fracture half-length change
Turn to exponential function, in reservoir numerical simulation software Eclipse waterpower fracture condudtiviy with fracture half-length change foundation
Exponential function is converted into step function by mesh spacing, respectively by step function value assignment to characterize crack each grid in,
Change of the hydraulic fracture flow conductivity with fracture half-length can be represented, it is initial as reservoir numerical simulation hydraulic fracture flow conductivity
Value.
2. hydraulic fracture flow conductivity FRCDWith strata pressure p change.During reservoir numerical simulation, with landing surface
The extraction of fluid, drop in formation pressure, 1. in hydraulic fracture flow conductivity initial value to be changed with strata pressure, and
Conventional numerical simulation does not account for this factor.According to Li Yingchuan (petroleum production engineering [M] Beijing:Petroleum industry publishing house, 2009:
220-221) hydraulic fracture flow conductivity expression formula is：
FRCD=kf(p)Wf (1)
In formula：
FRCD--- hydraulic fracture flow conductivity, μm2.cm；
kf(p) --- hydraulic fracture permeability under any strata pressure, μm2；
Wf--- hydraulic fracture slit width, cm.
Hydraulic fracture slit width WfGenerally several millimeters to several centimetres, it is relative with it is very small for matrix reservoirs, can be considered not
Become, therefore hydraulic fracture flow conductivity FRCDHydraulic fracture permeability k can be converted into strata pressure p changef(p) with stratum
The change of pressure p.
Strata pressure declines the increase for causing effective stress, and the phenomenon for causing reservoir permeability to reduce is referred to as the stress of reservoir
Sensitiveness.Low permeable and heterogeneity reservoir stress sensitive phenomenon for elastic development becomes apparent.Li Chuanliang (reservoir rock should
Power sensitivity evaluation method [J] grand celebrations petroleum geology and exploitation, 2006,25 (1):40-41) derive under any strata pressure
Reservoir permeability expression formula：
In formula：
K --- reservoir permeability, μm2；
ki--- initial reservoir permeability, μm2；
B --- stress sensitive constant, MPa-1；
φ --- reservoir porosity, %；
pi--- original formation pressure, MPa；
P --- any strata pressure, MPa.
When strata pressure declines, hydraulic fracture is increased by frame stress and causes the process and reservoir rock of permeability reduction
The stress sensitivity of stone is similar, therefore sets up variation relation formula of the hydraulic fracture permeability with strata pressure with expression formula (2)
It is as follows：
In formula：
kf(p) --- hydraulic fracture permeability under any strata pressure, μm2；
kf(pi) --- hydraulic fracture permeability under original formation pressure, μm2。
Rock stress sensitive function in using model inside reservoir numerical simulation software Eclipse, by hydraulic fracture
Regard the sillar for having stress sensitivity as, stress sensitive constant b is obtained according to the experiment of reservoir rock stress sensitivity, so as to calculate water
Power fracture permeabgility changes with strata pressure, and change of the hydraulic fracture flow conductivity with strata pressure is obtained with this.
Software concrete operation step is：1. rock stress sensitivity zoning is set：Matrix is 1st area, and hydraulic fracture is 2nd area；②
Permeability and original permeability ratio under Different Strata pressure are calculated respectively by expression formula (2) and (3)；3. in software using soft
Permeability under Different Strata pressure and original permeability ratio are assigned to part stress sensitive function into the area of matrix 1 respectively and waterpower is split
Stitch 2nd area.
(3) horizontal well Production development history matching
Setting up on the basis of heterogeneous geological model and the implantation of first pressure break waterpower fracture parameters, with reference to actual production
Data, fitting cumulative liquid production, cumulative oil production, cumulative water production, daily fluid production rate, daily oil production, water yield per day, strata pressure
Etc. index, cumulative liquid production and cumulative oil production relative error should be less than 5%, obtain remaining oil saturation and strata pressure
Distribution.
In the present invention, the step 3) horizontal well is repeated to press according to remaining oil saturation and strata pressure field distribution
Yield potential quantitative assessment is split, by first pressure break waterpower classification of rifts, specific aim refracturing mode is proposed, detailed process is such as
Under：
According to step 2) in obtained remaining oil saturation and strata pressure field distribution, if it is small to meet recovery percent of reserves simultaneously
It is more than 0.6 in 30%, reservoir pressure coefficient, then with refracturing yield potential.First pressure break hydraulic fracture is divided into four classes：
Temporarily stall temporarily blocks up crack initiation into crack initiation, section, without refracturing in old seam lengthening crack initiation, seam.
(1) old seam lengthens crack initiation
First fracturing reform insufficient (be less than first FRACTURING DESIGN and stitch length) and recovery percent of reserves are less than 30%, strata pressure
The hydraulic fracture that coefficient is more than 0.6 is classified as a class, and initiation mode is lengthened using old seam.
(2) interior temporarily stall is stitched to crack initiation
First fracturing reform fully (is met into first FRACTURING DESIGN seam length) and recovery percent of reserves is less than 30%, strata pressure system
Number is more than 0.6 and stitches and is smaller than 30m hydraulic fracture and is classified as a class, using in seam temporarily stall to initiation mode.
(3) temporarily stifled crack initiation in section
By first fracturing reform fully and recovery percent of reserves is less than 30%, reservoir pressure coefficient more than 0.6 and to stitch spacing big
A class is classified as in 30m hydraulic fracture, using temporary stifled initiation mode in section.
(4) without refracturing
If be unsatisfactory for recovery percent of reserves is more than 0.6 less than 30%, reservoir pressure coefficient, it is not recommended that refracturing, it should be used
His development scheme, recovers its production capacity.
Compared with prior art, the device have the advantages that：
(1) present invention can be to horizontal well refracturing yield potential quantitative assessment and hydraulic fracture refracturing mode point
Class, proposes specific aim refracturing mode；
(2) present invention considers strata pressure in hydraulic fracture shape and production process simultaneously during reservoir numerical simulation
The influence changed to hydraulic fracture flow conductivity, its analog result more conforms to actual production dynamic；
(3) first pressure break waterpower fracture parameters, reservoir numerical simulation are studied remaining oil saturation and stratum by the present invention
Pressure field distribution, the quantitative assessment of refracturing yield potential are combined, and links closely interlock, are mutually authenticated, and improve repetition
The accuracy of fracturing yield increasing Potential Evaluation, reduces construction risk.
Brief description of the drawings
Fig. 1 (a) is waterpower fracture shape top view in conventional numerical simulation.
Fig. 1 (b) is actual hydraulic fracture shape top view in the embodiment of the present invention.
Fig. 2 is waterpower fracture condudtiviy in the embodiment of the present invention with fracture half-length's variation diagram.
Fig. 3 is the first pressure break hydraulic fracture geometrical model figure of net horizontal section in the embodiment of the present invention.
Fig. 4 (a) is horizontal well cumulative liquid production matched curve figure in the embodiment of the present invention.
Fig. 4 (b) is horizontal well cumulative oil production matched curve figure in the embodiment of the present invention.
Fig. 4 (c) is horizontal well daily fluid production rate matched curve figure in the embodiment of the present invention.
Fig. 4 (d) is horizontal well daily oil production matched curve figure in the embodiment of the present invention.
Fig. 4 (e) is horizontal well water yield per day matched curve figure in the embodiment of the present invention.
Fig. 4 (f) is strata pressure matched curve figure in the embodiment of the present invention.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
It is necessarily pointed out that, the present embodiment is only the preferred embodiments of the present invention, not makees any to the present invention
Limitation, is also not limited to form disclosed herein, is not to be taken as the exclusion to other embodiment.Those skilled in the art are entered
Capable change and simple change does not depart from the technology of the present invention thought and scope, then belongs to the protection domain of technical solution of the present invention
It is interior.
Embodiment 1
China's oil reservoir block reservoir porosity 4.6~13.2%, average 10.5%, permeability 0.01~1.25 × 10-3μ
m2, average 0.39 × 10-3μm2, crude oil saturation degree 38%, reservoir buried depth 1968m, initial strata pressure 24.3MPa, formation temperature
88.9 DEG C, lithology is thin sand-mud interbed, and physical property and oiliness are poor, belongs to heterogeneous and low permeability tight sandstone reservoir, is used
The many cluster volume fracturing technological development of the extensive multistage of horizontal well.Wherein a bite horizontal well, horizontal section length 1200m, first pressure break
10 section of 39 cluster, designs fracture half-length 300m, seam spacing 30m.Developed using elastic energy, no flooding pattern, current daily oil production
1.8t/d is fallen below by 26.3t/d at initial stage.Development effectiveness is deteriorated, and is badly in need of carrying out the evaluation of refracturing yield potential.
Low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method, comprises the following steps successively：
1), the first pressure break waterpower fracture parameters of inverting：With reference to the block reservoir rock mechanics parameters, reservoir physical parameter,
Reservoir fluid parameter and first pressing crack construction data, table 1 give target well horizontal segment first paragraph (3500-3380m) pressure break
Working procedure, obtains first pressure break waterpower fracture parameters as shown in table 2 using Meyer software invertings.
The single hop pressing crack construction activity list of table 1
The first pressure break waterpower fracture parameters table of table 2
2) remaining oil saturation and strata pressure field distribution, are studied using reservoir numerical simulation software Eclipse, it has
Body step includes setting up the heterogeneous geological model of oil reservoir, the heterogeneous geological model of first pressure break waterpower fracture parameters implantation, level
Well Production development history matching.
(1) the heterogeneous geological model of oil reservoir is set up：According to reservoir physical parameter, reservoir fluid parameter, survey where horizontal well
Well interpretation data as shown in table 3, sets up heterogeneous geological model, model size 1600m × 1000m × 5.2m, mesh spacing 10m
× 10m × 5.2m, grid sum 16000.
The pressure break horizontal well horizontal segment well log interpretation table of table 3
(2) first pressure break waterpower fracture parameters implantation：The change of waterpower fracture condudtiviy considers two in implantation process
Factor：Change with fracture half-length and change with strata pressure.Conventional numerical simulation water fracture shape is rectangle such as Fig. 1 (a), and real
Border hydraulic fracture shape is wedge shape such as Fig. 1 (b), and hydraulic fracture shape is considered wedgewise, hydraulic fracture flow conductivity by this method
By step-length ladder assignment, as shown in Figure 2.The stress sensitivity effect caused in production process due to drop in formation pressure is considered simultaneously
Should, according to step 2) in calculate permeability and initial infiltration ratio under Different Strata pressure as shown in table 4 expression formula (2) and (3),
Calculate used parameter：Reservoir porosity φ is 10.5%, and hydraulic fracture porosity φ is 25%, initial strata pressure
24.3MPa, reservoir stress sensitive constant b are obtained as 0.094 by the experiment of reservoir rock stress sensitivity.Net horizontal section 1200m, water
10 section 39 of power crack cluster, cluster spacing 30m, geometrical model is as shown in Figure 3.
Permeability and original permeability ratio table under the Different Strata pressure of table 4
| Strata pressure (MPa) | Reservoir permeability ratio (k/ki) | Hydraulic fracture permeability ratio (kf(p)/kf(pi)) |
| 24.3 | 1.000 | 1 |
| 20.5 | 0.963 | 0.915 |
| 18.5 | 0.944 | 0.873 |
| 16.5 | 0.926 | 0.833 |
| 14.5 | 0.908 | 0.794 |
| 12.5 | 0.890 | 0.758 |
| 10.5 | 0.873 | 0.723 |
| 8.5 | 0.856 | 0.690 |
| 6.5 | 0.839 | 0.658 |
(3) horizontal well Production development history matching：According to horizontal well actual production working system fitting cumulative liquid production, tire out
The production targets such as product oil production, daily fluid production rate, daily oil production, water yield per day, strata pressure, verify the correctness of model.Wherein
As shown in table 5, from the point of view of the result of fitting, and actual production is relatively for cumulative liquid production and cumulative oil production, accumulation production liquid
Amount and cumulative oil production relative error are less than 5%, meet fitting precision requirement, its production target history matching curve such as Fig. 4 (a)
Shown in~4 (f).
The Production development history matching result table of table 5
3), horizontal well refracturing yield potential quantitative assessment
Understood according to the result remaining oil saturation and strata pressure of Production development history matching：Analog block level
Well controlled geological reserves are 30 × 104T, horizontal well cumulative oil production 0.72 × 104T, recovery percent of reserves 2.4%, the initial stratum of reservoir
Pressure is 24.3MPa, and current stratum strata pressure 12.6MPa, reservoir pressure coefficient 0.65 meets step 3) require.While root
Hydraulic fracture cluster number 3~4,11~12,20,23~24,31~32 is understood according to first pressure break waterpower fracture parameters inversion result table 2
Fracture half-length is much smaller than design fracture half-length (design fracture half-length is 300m), and wherein hydraulic fracture cluster number presses horizontal well geometry mould
Turned left number consecutively from the right side in type Fig. 3.These hydraulic fractures are not mended due to the reasons such as geology or engineering, first fracturing reform
Fill, reservoir is not linked up effectively.Other hydraulic fracture parameters meet pressing crack construction design requirement, and first fracturing reform is abundant.
According to step 3 of the present invention) the first pressure break waterpower classification of rifts of horizontal well is administered, propose two for Exemplary levels well
Plant refracturing mode：Temporarily stall lengthens crack initiation to crack initiation and old seam in seam, as shown in table 6.
Table is administered in the classification of the hydraulic fracture of table 6
Claims (5)
1. low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method, comprises the following steps successively：
1) crack extended model, the first pressure break waterpower fracture parameters of inverting are set up using Meyer softwares；
2) the heterogeneous geological model of oil reservoir is set up using reservoir numerical simulation software Eclipse, and by first pressure break hydraulic fracture
Parameter is implanted into heterogeneous geological model, carries out Production development history matching, obtains remaining oil saturation and strata pressure point
Cloth；
3), will just according to remaining oil saturation and strata pressure field distribution to horizontal well refracturing yield potential quantitative assessment
Secondary pressure break waterpower classification of rifts, proposes specific aim refracturing mode.
2. low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method as claimed in claim 1, its feature
It is, the step 1) set up crack extended model using Meyer softwares, the first pressure break waterpower fracture parameters of inverting, including with
Lower content：Reservoir rock mechanics parameter, reservoir physical parameter, reservoir fluid parameter, first pressing crack construction where collecting horizontal well
Data, crack extended model is set up using Meyer softwares, and inverting obtains first pressure break waterpower fracture parameters, including fracture half-length
Lf, slit width Wf, stitch high Hf, flow conductivity FRCD。
3. low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method as claimed in claim 1, its feature
It is, the step 2) the heterogeneous geological model of oil reservoir is set up, and first pressure break waterpower fracture parameters are implanted into heterogeneous geology
Model, carries out Production development history matching, obtains remaining oil saturation and strata pressure field distribution, including herein below：
(1) reservoir physical parameter, reservoir fluid parameter, well log interpretation data, obtain reservoir porosity, ooze where collecting horizontal well
Saturating rate, oil saturation, oil reservoir degree of burying, reservoir thickness, fluid high-pressure physical parameter, fluid phase percolation curve, utilize numerical reservoir
Simulation softward Eclipse sets up the heterogeneous geological model of oil reservoir；
(2) first pressure break waterpower fracture parameters are implanted into heterogeneous geological model, wherein hydraulic fracture flow conductivity FRCDNon- equal
The factor of two aspects is considered in matter geological model：
1. hydraulic fracture flow conductivity FRDCWith fracture half-length LfChange：Waterpower is split in reservoir numerical simulation software Eclipse
Exponential function is converted into step function by seam flow conductivity with the change of fracture half-length according to mesh spacing, respectively by step function
Be worth assignment to characterize crack each grid in, you can expression hydraulic fracture flow conductivity with the change of fracture half-length, be used as oil
Hide numerical simulation hydraulic fracture flow conductivity initial value；
2. hydraulic fracture flow conductivity FRCDWith strata pressure p change：
FRCD=kf(p)Wf
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In formula：
kf(p) --- hydraulic fracture permeability under any strata pressure, μm2；
Wf--- hydraulic fracture slit width, cm；
kf(pi) --- hydraulic fracture permeability under original formation pressure, μm2；
B --- stress sensitive constant, MPa-1；
φ --- reservoir porosity, %；
pi--- original formation pressure, MPa；
P --- any strata pressure, MPa；
(3) actual production data, fitting cumulative liquid production, cumulative oil production, cumulative water production, daily fluid production rate, day oil-producing are combined
Amount, water yield per day, strata pressure, obtain remaining oil saturation and strata pressure field distribution.
4. low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method as claimed in claim 1, its feature
It is, the step 3) it is quantitative to horizontal well refracturing yield potential according to remaining oil saturation and strata pressure field distribution
Evaluate, by first pressure break waterpower classification of rifts, propose specific aim refracturing mode, detailed process is as follows：
(1) hydraulic fracture that first fracturing reform is insufficient and recovery percent of reserves is less than 30%, reservoir pressure coefficient more than 0.6 is returned
For a class, initiation mode is lengthened using old seam；
(2) by first fracturing reform fully and recovery percent of reserves be less than 30%, reservoir pressure coefficient be more than 0.6 and seam be smaller than
30m hydraulic fracture is classified as a class, using in seam temporarily stall to initiation mode；
(3) first fracturing reform is fully less than 30%, reservoir pressure coefficient more than 0.6 and stitches spacing and be more than with recovery percent of reserves
30m hydraulic fracture is classified as a class, using temporary stifled initiation mode in section；
(4) if be unsatisfactory for recovery percent of reserves is more than 0.6 less than 30%, reservoir pressure coefficient, it is not recommended that refracturing.
5. low permeable and heterogeneity reservoir horizontal well refracturing yield potential evaluation method as claimed in claim 4, its feature
It is, the first fracturing reform is insufficient to refer to that being less than first FRACTURING DESIGN stitches length, and first fracturing reform fully refers to meet
First FRACTURING DESIGN seam length.
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