CN109522579A - Fractured horizontal well construction Fracturing Pressure Prediction method - Google Patents
Fractured horizontal well construction Fracturing Pressure Prediction method Download PDFInfo
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Abstract
The invention discloses a kind of fractured horizontal well construction Fracturing Pressure Prediction methods, comprising: the fracturing parameter of the fractured well of the statistics each layer position in target area；Determine the construction fracture pressure intermediate value that a certain layer position in each layer position is controlled by vertical depth；Based on the fracture pressure gradient Pgh of the construction a certain layer position of fracture pressure median calculation, and then obtain the relationship of the construction fracture pressure and reservoir vertical depth of a certain layer position；Determine the construction fracture pressure of a certain layer position and the relationship of reservoir shale content；Establish the horizontal well construction fracture pressure difference Δ P of a certain layer positionc；Calculate the construction fracture pressure P at horizontal well A target spotDepth；Construction fracture pressure at A target spot is modified.The advantage is that: the foundation of this method, can be net horizontal section pressing crack construction Fracturing Pressure Prediction providing method, and then scientific basis can be provided for effect assessment after the research of each section of Optimized fracturing design of horizontal well, fracture initiation and Extending Law, horizontal well pressure.
Description
Technical field
The present invention relates to fine and close Reservoir Development fields, more particularly, to a kind of fractured horizontal well construction fracture pressure
Prediction technique.
Background technique
Multi-stage water power pressure break is commonly used for one of horizontal well pressure break completion mode, it can be in the difference in same reservoir
Position forms a plurality of hydraulic fracture, can increase oil/gas drainage volume, reduces resistance of the oil gas from reservoir to Wellbore Flow
Power.Since the Lateral heterogeneity of reservoir changes, physical property and the mechanical properties of rock difference of the different location of net horizontal section, thus
Cause the fracture pressure of different well section pressing crack constructions different, process implementing mistake of the higher or lower fracture pressure to pressing crack construction
Whether journey is smooth, and if it is capable of forming expected sanding section tool and has a certain impact, each section of Accurate Prediction before pressing crack construction
Construction fracture pressure be very important.
The research of pressure break fracture pressure is always the hot issue in domestic and international petroleum works field, and many experts learn at present
Person focuses on the research of formation fracture pressure.Formation fracture pressure is defined as making stratum generate hydraulic fracture or opening primary fracture
When downhole fluid pressure.It is answered with rock elastic property, pore pressure, the developmental state of intrinsic fracture and the ground of this area
The factors such as power are related.The methods of it can be calculated by theoretical equation, log analysis, and site operation parameter is calculated and statisticallyd analyze
It obtains.Pressing crack construction fracture pressure refers in pressing crack construction process, the operation pressure of the acted on well head of ground fracturing equipment,
Formation fracture pressure directly influences construction fracture pressure.Construct fracture pressure in addition to being influenced by formation fracture pressure,
Also influenced by construction friction and manifold fracturing fluid in the fluid column gravity of vertical well section.Scholar has delivered a large amount of academic opinion
Text and publication, form more method and understanding in terms of the calculating of formation fracture pressure, in middle National IP Network with " rupture
Pressure " is that autograph is retrieved, and shares paper 155；It is that autograph is retrieved with " fracture pressure " & " horizontal well ", shares opinion
Text 5, is the theme with " fracture pressure " & " horizontal well " and is retrieved, and shares paper 7；Chinese patent net (http: //
Www.soopat.com), retrieved with " fracture pressure ", share publication 10.
Theoretical calculation method is mainly based upon for the calculation method of formation fracture pressure, considers different influence factors,
Be mainly the following method: (1) Eaton method: this method thinks that lateral force suffered by exposed stratum is equal to stratum level master
Start crack initiation when crustal stress, and horizontal crustal stress is and to refer to assume and generalized Hooke is fixed as caused by overburden pressure
Rule is described；(2) Anderson method: this method obtains the coefficient for being enough to determine formation fracture pressure from well-log information, examines
The influence of borehole wall upper stress concentration is considered, and has assumed that stratum tensile strength is zero and takes even level's stress item without tectonic stress
Under part, and according to crack initiation when head of liquid increase makes that effective circumferential stress is become zero by compressive state on the borehole wall in well
Condition；(3) Stephen method: the lateral force that this method assumes that stratum is subject to starts crack initiation when being equal to horizontal main crustal stress, horizontally
The horizontal stress component and additional tectonic stress component that stress is generated by overlying rock effect form, while assuming in same area
Ratio in block between horizontal structural s tress and effective overburden pressure is a constant, and not with change in depth；(4) yellow flourish cup method:
This method advocates that the rupture on stratum is to be determined by the stress state on the borehole wall, and consider the non-homogeneous of underground physical presence
The influence of the effect of stress field and stratum intensity itself is a kind of current most widely used model.
Also more for the calculation method of fractured horizontal well formation fracture pressure, C.H.Yew is managed using three dimensional elasticity first
By the inclined shaft and horizontal well Fracturing Pressure Prediction model that are simplified and Fracturing Pressure Prediction result is calculated；Remaining hawk etc. exists
The stress distribution model at slopes wall is set up on the basis of the improved coordinate system of C.H.Yew, and establishes splitting for suitable inclined shaft
Stitch fracture pressure and crack initiation orientation computation model；M.M.Hossain etc. establishes inclined shaft and horizontal well in barefoot completion and perforation
The Fracturing Pressure Prediction model of complete underground, the gash fracture calculation of pressure model set up both at home and abroad at present are mainly built upon
On the basis of M.M.Hossain model, model considers pit shaft internal pressure, Original strata stress, thermal stress, fracturing fluid seep effect, rock
The influence of the factors such as temperature change, for determining horizontal well orientation angle, along horizontal wellbore reservoir parameter such as Poisson's ratio, springform
The little situations of differences such as amount, the horizontal wellbore each position gash fracture pressure difference being calculated using the model is away from little；Still
M.M.Hossain model and Sneddon the crack-induced stress analysis models coupling established are established open hole well and penetrated by uncommon great waves
Hole well horizontal well fracturing fracture pressure model, research is mainly for first pressing off crack to the shadow of follow-up location fracture pressure
It rings；The Li Pei hypertext analysis any deflecting angle horizontal well in normal fault stratum under two kinds of completion modes of barefoot completion and perforation completion,
The stress state of pit shaft and eyelet, using alternative, gives horizontal well based on vertical well formation fracture pressure formula
The analytic formula of formation fracture pressure analyzes the relationship of formation fracture pressure and completion mode and deflecting angle.
At home in terms of patent, patent " for calculate ultradeep well formation fracture pressure method (application number:
201210012369.5) a kind of calculation method of ultradeep well formation fracture pressure is disclosed in ", invention is based on elastic theory, hole
Gap elastic theory and thermoelastic theory have comprehensively considered many factors that will affect computational accuracy, have improved computational accuracy.Specially
" shale gas reservoir formation fracture pressure gradient well logging determines that method (application number: discloses one kind in 201410123365.3) " to benefit
It is related to shale gas reservoir formation fracture pressure gradient and determines method, i.e., calculates shale by interval value or by a fixed step size in interval
Gas reservoir target interval formation fracture pressure gradient；Target interval formation pore fluid pressure is obtained by well logging or well-log information
Gradient；Target interval Rock Poisson Ratio Using is obtained by well logging or laboratory core analysis of experiments data；Pass through well logging or well-log information
Obtain gas saturation；Superstratum lithology and density logging is obtained by well-log information；Calculate shale reservoir formation fracture pressure gradient
With reservoir formation fracture pressure.A kind of patent " the determination method of the hydraulic fracturing fracture pressure based on Geological stength index (application
Number: 201210064177.9) a kind of determination method of hydraulic fracturing fracture pressure based on Geological stength index " is disclosed, benefit
Standard sample is prepared with complete coal petrography block, is tested by uniaxial and triaxial shear strength, and true according to Geological stength index template
The GSI value size for determining reservoir, comprehensively considers complete coal petrography block and reservoir structure feature these two aspects determines the fracture pressure of reservoir
Size.Patent " a kind of prediction while drilling stratum under drill bit caving pressure and fracture pressure method (application number:
200510123407.4) method of a kind of prediction while drilling stratum under drill bit caving pressure and fracture pressure " is disclosed.Include:
Extract one and wait for several road earthquake records by the drilling well of well drilling neighbouring to drilling well and with this, make weighting processing obtain should to drilling well and
The earthquake record of drilling well；Interval transit time and density log are carried out to drilling well, obtain the different interval stratum of the drilling well
Log data；Using the log data and earthquake record, point using earthquake record prediction stratum acoustic speed, wave impedance is established
Layer model；Predict that this waits for the log of drilling well stratum under drill bit；Stablizing the prediction of mechanics log interpretation model in conjunction with simultaneously wall should
Caving pressure and fracture pressure to drilling well stratum under drill bit.A kind of patent " figure for the calibration of different reservoir fracture pressure
(application number: 201320854482.8) " disclosing a kind of map board holder for the calibration of different reservoir fracture pressure to grillage, main to solve
The a large amount of comparison patterns drawn when the calibration of oil field different reservoir fracture pressure are certainly carried out, effect existing for manpower by hand positioning is passed through
The low problem with positioning accuracy difference of rate.
The pertinent literature and patent finding of presently disclosed fractured horizontal well construction Fracturing Pressure Prediction method show
Horizontal well reservoir reconstruction Fracturing Pressure Prediction method is numerous, but since parameter required in model lacks or seeks complexity, for low
It seeps, special type hydrocarbon reservoir, the calculation method of the rupture pressure break of fractured horizontal well is simultaneously few, and precision and accuracy are not
It is high.
Therefore, it is necessary to develop a kind of simple and easy to do, precision and the higher fractured horizontal well construction fracture pressure of accuracy
Prediction technique.
The information for being disclosed in background of invention part is merely intended to deepen the reason to general background technique of the invention
Solution, and it is known to those skilled in the art existing to be not construed as recognizing or imply that the information is constituted in any form
Technology.
Summary of the invention
The invention proposes a kind of fractured horizontal well construction Fracturing Pressure Prediction methods, can apply for net horizontal section pressure break
Work Fracturing Pressure Prediction providing method, and then can be ground for each section of Optimized fracturing design of horizontal well, fracture initiation and Extending Law
Study carefully, effect assessment provides scientific basis after horizontal well pressure.
A kind of Fracturing Pressure Prediction method according to an aspect of the invention, it is proposed that fractured horizontal well is constructed, comprising:
Count the fracturing parameter of the fractured well of each layer position in target area；
Determine the construction fracture pressure intermediate value that a certain layer position in each layer position is controlled by vertical depth；
Based on the fracture pressure gradient Pgh of a certain layer position described in the construction fracture pressure median calculation, and then obtain institute
State the relationship of the construction fracture pressure and reservoir vertical depth of a certain layer position；
The fracturing parameter based on statistics determines the construction fracture pressure and reservoir mud of a certain layer position
The relationship of matter content；
The fracturing parameter based on statistics establishes the horizontal well construction fracture pressure difference Δ of a certain layer position
Pc；
Calculate the construction fracture pressure P at the horizontal well A target spotDepth；
Construction fracture pressure at the A target spot is modified.
Preferably, further comprise:
Based on above steps, each section of construction fracture pressure is calculated.
Preferably, described each section of construction fracture pressure PStageAre as follows:
PStage=Ptrue+ΔP(1+(Gi-GA)/GA) (5)
In formula, PStageFor each section of construction fracture pressure；
PtrueFor revised construction fracture pressure；
Δ P is that construction fracture pressure is poor；
Gi is horizontal segment well logging gamma value；
GAFor the shale content for being fitted acquisition in construction fracture pressure and the relationship of reservoir shale content.
Preferably, the fracturing parameter includes: the layer position of target zone, target zone vertical depth, target zone shale content, applies
Work fracture pressure and net horizontal section well logging gamma value Gi.
Preferably, the construction that a certain layer position is controlled by vertical depth is obtained using the gravity model appoach in clustering method
Fracture pressure intermediate value.
Preferably, the construction fracture pressure and the relationship of the reservoir vertical depth are
PDepth=a0+a1 × Depth (1)
In formula, PDepthFor the construction fracture pressure of calculating；
A0 is construction fracture pressure intermediate value acquired in the gravity model appoach in clustering method；
A1 is construction fracture pressure gradient, units MPa/m；
Depth is depth of reservoirs.
Preferably, the relationship of the construction fracture pressure and the reservoir shale content are as follows:
In formula, Pc is the construction fracture pressure of statistics；
M is the recurrence multiplier factor of the power exponent relationship of fracture pressure and shale content；
ScFor shale content；
N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
Preferably, the construction fracture pressure difference Δ P of acquisition is countedcAre as follows:
ΔPc=Pcmax-Pcmin (3)
In formula, PcmaxFor the weighted average of 20% biggish statistics construction fracture pressure；
PcminFor the weighted average of 20% lesser statistics construction fracture pressure.
It is preferably based on and is fitted the shale of acquisition in the construction fracture pressure and the relationship of the reservoir shale content and contains
Measure GA, the construction fracture pressure at the A target spot is modified.
Preferably, the revised construction fracture pressure PtrueAre as follows:
In formula, PtrueFor revised construction fracture pressure；
PDepthFor the construction fracture pressure of calculating；
M is the recurrence multiplier factor of the power exponent relationship of fracture pressure and shale content；
ScFor shale content；
N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
A kind of fractured horizontal well construction Fracturing Pressure Prediction method according to the present invention, the advantage is that: sufficiently applying
Early period pressure break data big data analysis as a result, to simplify the lot of experimental data needed for calculating, calculation method simple, it is opposite accidentally
Difference is less than 20%, precision of prediction with higher, the foundation of this method, can be net horizontal section pressing crack construction Fracturing Pressure Prediction
Providing method, and then aftereffect can be pressed for each section of Optimized fracturing design of horizontal well, fracture initiation and Extending Law research, horizontal well
Fruit evaluation provides scientific basis.
Method of the invention has other characteristics and advantages, these characteristics and advantages from the attached drawing being incorporated herein and with
Will be apparent in specific embodiment afterwards, or by the attached drawing and subsequent specific embodiment being incorporated herein into
Row statement, these the drawings and specific embodiments in detail are used together to explain specific principle of the invention.
Detailed description of the invention
Exemplary embodiment of the present is described in more detail in conjunction with the accompanying drawings, of the invention is above-mentioned and other
Purpose, feature and advantage will be apparent.
Fig. 1 shows a kind of fractured horizontal well construction Fracturing Pressure Prediction of an exemplary embodiment according to the present invention
The flow chart of the step of method.
Fig. 2 shows a construction fracture pressure for exemplary embodiment according to the present invention and showing for shale content relationship
It is intended to.
The relationship of construction fracture pressure and depth of reservoirs that Fig. 3 shows an exemplary embodiment according to the present invention is shown
It is intended to.
Fig. 4 shows the construction fracture pressure of an exemplary embodiment according to the present invention and the pass of reservoir shale content
It is schematic diagram.
Specific embodiment
The present invention will be described in more detail below with reference to accompanying drawings.Although showing the preferred embodiment of the present invention in attached drawing,
However, it is to be appreciated that may be realized in various forms the present invention and should not be limited by the embodiments set forth herein.On the contrary, providing
These embodiments are of the invention more thorough and complete in order to make, and can will fully convey the scope of the invention to ability
The technical staff in domain.
The present invention provides a kind of fractured horizontal well construction Fracturing Pressure Prediction methods, comprising:
Count the fracturing parameter of the fractured well of each layer position in target area；
Determine the construction fracture pressure intermediate value that a certain layer position in each layer position is controlled by vertical depth；
Based on the fracture pressure gradient Pgh of the construction a certain layer position of fracture pressure median calculation, and then obtain a certain layer position
The relationship of the construction fracture pressure and reservoir vertical depth；
Fracturing parameter based on statistics determines the construction fracture pressure of a certain layer position and the pass of reservoir shale content
System；
Fracturing parameter based on statistics establishes the horizontal well construction fracture pressure difference Δ P of a certain layer positionc；
Calculate the construction fracture pressure P at horizontal well A target spotDepth；
Construction fracture pressure at A target spot is modified.
Preferably, further comprise: based on above steps, calculating each section of construction fracture pressure.
Wherein, each layer of position at least needs 10 mouthfuls of wells as statistical sample.
Preferably, fracturing parameter include: the layer position of target zone, target zone vertical depth, target zone shale content,
Fracture pressure of constructing and net horizontal section well logging gamma value Gi.
Sufficiently apply the big data analysis of pressure break data early period as a result, simplify calculate needed for lot of experimental data,
Calculation method is simple, and relative error is less than 20%, precision of prediction with higher.
Preferably, the construction that a certain layer position is controlled by vertical depth is obtained using the gravity model appoach in clustering method to break
Split pressure intermediate value.
By all fractured wells of a certain layer position, pressing crack construction in this layer of position is obtained using the gravity model appoach in clustering method
The value of fracture pressure most similarity represents the fracture pressure intermediate value of this layer of position with the value.
Wherein, be the characteristics of gravity model appoach it is insensitive to exceptional value, cluster result is more stable.Method particularly includes: it calculates each
The difference of the fracture pressure of mouth well or each section of construction fracture pressure and other well/sections, between two mouthfuls of well/section fracture pressures
Difference is defined as class at a distance from class, and the fracture pressure center of gravity of so-called each layer of position is exactly the mean value of such sample, wherein each well/
The construction fracture pressure of section is exactly itself, and the center of gravity of the fracture pressure of Liang Koujing/section class is exactly two fracture pressure values
Midpoint.It can clustering calculating being fast implemented using mathematical statistics software.
Preferably, the relationship for the fracture pressure and reservoir vertical depth of constructing are as follows:
PDepth=a0+a1 × Depth (1)
In formula, PDepthFor the construction fracture pressure of calculating；
A0 is construction fracture pressure intermediate value acquired in the gravity model appoach in clustering method；
A1 is construction fracture pressure gradient, units MPa/m；
Depth is depth of reservoirs.
Preferably, the relationship for the fracture pressure and reservoir shale content of constructing are as follows:
In formula, Pc is the construction fracture pressure of statistics；
M is the recurrence multiplier factor of the power exponent relationship of fracture pressure and shale content；
ScFor shale content；
N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
Pair between a certain layer position pressure break well construction fracture pressure and reservoir shale content is determined using clustering method
It should be related to.According to the fracturing parameter of statistics, by the shale content S in the reservoir properties of the construction well of same layer positioncAccording to Sc
< 5%, 5% < Sc< 10%, 10% < Sc< 15%, 15% < Sc< 20%, Sc> 20% carries out the division in 5 sections, to calculate
To the construction fracture pressure intermediate value within the scope of the shale content of each rank, shale content and construction fracture pressure intermediate value Dan Yin
Plain exponentially correlation, and then the exponential relationship between construction fracture pressure and reservoir shale content is determined according to statistical dataThe M value and n value in the exponential relationship can be quickly determined by curve matching.
Preferably, the construction fracture pressure difference Δ P of acquisition is countedcAre as follows:
ΔPc=Pcmax-Pcmin (3)
In formula, PcmaxFor the weighted average of 20% biggish statistics construction fracture pressure；
PcminFor the weighted average of 20% lesser statistics construction fracture pressure.
Wherein, Δ Pc=Δ P.
Wherein, when calculating construction fracture pressure of some layer of position mouthful water horizontal well at a certain section, first according to layer position
The construction fracture pressure value P at well A target spot is calculated in average shale content and reservoir deeplyDepth。
Preferably, the shale content of acquisition is fitted in the relationship based on construction fracture pressure and reservoir shale content
GA, the construction fracture pressure at A target spot is modified.
Wherein, revised construction fracture pressure PtrueAre as follows:
In formula, PtrueFor revised construction fracture pressure；
PDepthFor the construction fracture pressure of calculating；
M is the recurrence multiplier factor of the power exponent relationship of fracture pressure and shale content；
ScFor shale content；
N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
Preferably, each section of construction fracture pressure PStageAre as follows:
PStage=Ptrue+ΔP(1+(Gi-GA)/GA) (5)
In formula, PStageFor each section of construction fracture pressure；
PtrueFor revised construction fracture pressure；
Δ P is that construction fracture pressure is poor；
Gi is horizontal segment well logging gamma value；
GAFor the shale content for being fitted acquisition in construction fracture pressure and the relationship of reservoir shale content.
The foundation of this method can be net horizontal section pressing crack construction Fracturing Pressure Prediction providing method, and then can be water
Effect assessment provides scientific basis after each section of Optimized fracturing design of horizontal well, fracture initiation and Extending Law research, horizontal well pressure.
Embodiment
Fig. 1 shows a kind of fractured horizontal well construction Fracturing Pressure Prediction of an exemplary embodiment according to the present invention
The flow chart of the step of method.
The Fracturing Pressure Prediction method as shown in Figure 1, a kind of fractured horizontal well of the present embodiment is constructed, comprising:
Count the fracturing parameter of the fractured well of each layer position in target area；
Determine the construction fracture pressure intermediate value that a certain layer position in each layer position is controlled by vertical depth；
Based on the fracture pressure gradient Pgh of the construction a certain layer position of fracture pressure median calculation, and then obtain a certain layer position
The relationship of the construction fracture pressure and reservoir vertical depth；
Fracturing parameter based on statistics determines the construction fracture pressure of a certain layer position and the pass of reservoir shale content
System；
Fracturing parameter based on statistics establishes the horizontal well construction fracture pressure difference Δ P of a certain layer positionc；
Calculate the construction fracture pressure P at horizontal well A target spotDepth；
Construction fracture pressure at A target spot is modified.
In the present embodiment, the construction data of a certain 128 mouthfuls of water horizontal wells of block reservoir is collected, is determined using clustering method
The construction fracture pressure intermediate value that a certain layer position is controlled by vertical depth.Clustering methodology can use SPSS software realization, and calculated result is such as
The following table 1:
Deep and construction fracture pressure intermediate value in 1 reservoir of table
| Series of strata | Depth intermediate value (m) | It constructs fracture pressure intermediate value (MPa) |
| Layer 1 | 2581.5 | 45.3 |
| Layer 2 | 2693 | 47.6 |
| Layer 3 | 2743 | 50.2 |
| Layer 4 | 2767 | 48.76 |
| Layer 5 | 2780 | 53 |
So as to obtain the linear regression formula between construction fracture pressure and depth of reservoirs:
PDepth=a0+a1 × Depth (1)
In formula, PDepthFor the construction fracture pressure of calculating；A0 is construction acquired in the gravity model appoach in clustering method
Fracture pressure intermediate value, units MPa；A1 is construction fracture pressure gradient, unit Mpa/m；Depth is depth of reservoirs.
The relationship of construction fracture pressure and depth of reservoirs that Fig. 3 shows an exemplary embodiment according to the present invention is shown
It is intended to.
As shown in figure 3, a1 is construction fracture pressure gradient, units MPa/m is the fracture pressure value and depth by being counted
The slope of the tropic of degree, having obtained the fracture pressure value at 1000m is 25Mpa, and the fracture pressure value at 1100m is 27MPa,
Fracture pressure value at 1200m is 27.5Mpa, then can go out the linear equation of fracture pressure, slope by this three groups of data regressions
For 0.0125MPa/m.
Therefore in the present embodiment, a0=35.093Mpa；A1=0.031Mpa/m
Fig. 2 shows a construction fracture pressure for exemplary embodiment according to the present invention and showing for shale content relationship
It is intended to.
As shown in Fig. 2, drawing curve according to the fracturing parameter of statistics, determine that the construction of a certain layer position is broken
The relationship of split pressure and reservoir shale content:
In formula, Pc is the construction fracture pressure of statistics；M is that the recurrence of the power exponent relationship of fracture pressure and shale content multiplies
The number factor；ScFor shale content；N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
Fig. 4 shows the construction fracture pressure of an exemplary embodiment according to the present invention and the pass of reservoir shale content
It is schematic diagram.
As shown in figure 4, the fracturing section fracture pressure value for having obtained shale content 40% is 25Mpa, shale content 50% is pressed
The fracture pressure value for splitting section is 27MPa, and the fracture pressure value of 60% fracturing section of shale content is 27.5Mpa, then can by this three
Group data regression goes out the power-exponent eqution of fracture pressure, slope 0.0125MPa/m.
Therefore in the present embodiment, M=45.64MPa, n=0.0078
Wherein, the construction fracture pressure difference Δ P of acquisition is countedcAre as follows:
ΔPc=Pcmax-Pcmin (3)
In formula, PcmaxFor the weighted average of 20% biggish statistics construction fracture pressure；
PcminFor the weighted average of 20% lesser statistics construction fracture pressure.
The horizontal well construction fracture pressure for establishing a certain layer position of the block is poor, using formula (2) and formula (3) by biggish 20%
Taking-up is weighted and averaged to obtain 60.2MPa, and lesser 20% is taken out and is weighted and averaged to obtain 49.5MPa, so as to
Obtain the difference range 10.7MPa of this layer of horizontal well construction fracture pressure.
Calculating the construction fracture pressure value at block A target spot is 55.7Mpa.
Obtaining the construction fracture pressure at revised A target spot using formula (4) is 57.9Mpa.
Distinguish using formula (5), and according to the construction fracture pressure value that net horizontal section well logging gamma value calculates 5 sections of pre- pressure breaks
For 45.3MPa, 47.6MPa, 50.2MPa, 48.76MPa, 53MPa.
The embodiment of the present invention is described above, above description is exemplary, and non-exclusive, and also not
It is limited to disclosed embodiment.Without departing from the scope and spirit of embodiment described, for the art
Those of ordinary skill for many modifications and changes are obvious.The selection of term used herein, it is intended to best
Principle, practical application or the improvement to the technology in market of embodiment are explained in ground, or make the other common of the art
Technical staff can understand embodiments disclosed herein.
Claims (10)
- A kind of Fracturing Pressure Prediction method 1. fractured horizontal well is constructed, comprising:Count the fracturing parameter of the fractured well of each layer position in target area；Determine the construction fracture pressure intermediate value that a certain layer position in each layer position is controlled by vertical depth；Based on the fracture pressure gradient Pgh of a certain layer position described in the construction fracture pressure median calculation, so obtain it is described certain The relationship of the construction fracture pressure and reservoir vertical depth of one layer of position；The fracturing parameter based on statistics determines that the construction fracture pressure of a certain layer position contains with reservoir shale The relationship of amount；The fracturing parameter based on statistics establishes the horizontal well construction fracture pressure difference Δ P of a certain layer positionc；Calculate the construction fracture pressure P at the horizontal well A target spotDepth；Construction fracture pressure at the A target spot is modified.
- The Fracturing Pressure Prediction method 2. fractured horizontal well according to claim 1 is constructed, wherein further comprise:Based on above steps, each section of construction fracture pressure is calculated.
- The Fracturing Pressure Prediction method 3. fractured horizontal well according to claim 2 is constructed, wherein each section of the construction is broken Split pressure PStageAre as follows:PStage=Ptrue+ΔP(1+(Gi-GA)/GA) (5)In formula, PStageFor each section of construction fracture pressure；PtrueFor revised construction fracture pressure；Δ P is that construction fracture pressure is poor；Gi is horizontal segment well logging gamma value；GAFor the shale content for being fitted acquisition in construction fracture pressure and the relationship of reservoir shale content.
- The Fracturing Pressure Prediction method 4. fractured horizontal well according to claim 1 is constructed, wherein the fracturing parameter It include: layer position, target zone vertical depth, target zone shale content, construction fracture pressure and the net horizontal section well logging gamma value of target zone Gi。
- The Fracturing Pressure Prediction method 5. fractured horizontal well according to claim 1 is constructed, wherein utilize clustering method In gravity model appoach obtain the construction fracture pressure intermediate value that a certain layer position is controlled by vertical depth.
- The Fracturing Pressure Prediction method 6. fractured horizontal well according to claim 1 is constructed, wherein the construction fracture pressure Relationship with the reservoir vertical depth isPDepth=a0+a1 × Depth (1)In formula, PDepthFor the construction fracture pressure of calculating；A0 is construction fracture pressure intermediate value acquired in the gravity model appoach in clustering method；A1 is construction fracture pressure gradient, units MPa/m；Depth is depth of reservoirs.
- The Fracturing Pressure Prediction method 7. fractured horizontal well according to claim 1 is constructed, wherein the construction fracture pressure With the relationship of the reservoir shale content are as follows:In formula, Pc is the construction fracture pressure of statistics；M is the recurrence multiplier factor of the power exponent relationship of fracture pressure and shale content；ScFor shale content；N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
- The Fracturing Pressure Prediction method 8. fractured horizontal well according to claim 1 is constructed, wherein count the described of acquisition and apply Work fracture pressure difference Δ PcAre as follows:ΔPc=Pcmax-Pcmin (3)In formula, PcmaxFor the weighted average of 20% biggish statistics construction fracture pressure；PcminFor the weighted average of 20% lesser statistics construction fracture pressure.
- The Fracturing Pressure Prediction method 9. fractured horizontal well according to claim 1 is constructed, wherein ruptured based on the construction The shale content G of acquisition is fitted in pressure and the relationship of the reservoir shale contentA, pressure is ruptured to the construction at the A target spot Power is modified.
- The Fracturing Pressure Prediction method 10. fractured horizontal well according to claim 9 is constructed, wherein applied described in revised Work fracture pressure PtrueAre as follows:In formula, PtrueFor revised construction fracture pressure；PDepthFor the construction fracture pressure of calculating；M is the recurrence multiplier factor of the power exponent relationship of fracture pressure and shale content；ScFor shale content；N is the recurrence exponential factor of the power exponent relationship of fracture pressure and shale content.
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