CN108615102A - A method of the fine and close oil gas pressure break of evaluation forms network fracture ability - Google Patents
A method of the fine and close oil gas pressure break of evaluation forms network fracture ability Download PDFInfo
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Abstract
The invention discloses the methods that a kind of fine and close oil gas pressure break of evaluation forms network fracture ability, belong to fine and close oil-gas reservoir hydraulic fracturing reforming technology technical field.Including：Calculate the normalized Young's modulus E of the target well fractured layern, dilative angle ψnWith peak strain εpn, and brittleness index B is calculated on this basisI；Then intrinsic fracture factor F is calculatednWith crustal stress factor SI, and the seam net spreading factor F of the target well fractured layer is calculated on this basisnf；According to the brittleness index BIWith the seam net spreading factor FnfCalculate seam net index FI；Finally according to the seam net index FIWith the evaluation criterion pre-established, evaluation fractured layer forms the ability of network fracture.The present invention provides a kind of methods that complex fracture ability is formed when quantitative assessment densification oil-gas reservoir hydraulic fracturing, this method can accurately evaluate the ability that compact reservoir forms complex fracture, instruct Optimized fracturing design, the complexity for improving fine and close oil-gas reservoir fracturing fracture, reaches preferable effect of increasing production.
Description
Technical field
The present invention relates to fine and close oil-gas reservoir hydraulic fracturing reforming technology technology, more particularly to a kind of fine and close oil gas pressure break of evaluation
The method for forming network fracture ability.
Background technology
Fine and close oil is the abbreviation of compact reservoir oil, and main preservation space is that tight sand, marl, dolomite etc. are unconventional
Reservoir.In recent years, increasingly high with global energy requirements and production of hydrocarbons pressure, it is fine and close as non-conventional oil resource
Oil has become the new hot spot of the global unconventionaloil pool exploration and development after shale gas, " dark fund " being described as by petroleum industrial circle.
With going deep into for Oil And Gas Exploration And Development, fine and close oil-gas reservoir has become the important of petroleum resources and takes over, however causes
Close oil-gas reservoir is extremely low due to permeability and porosity, it is necessary to carry out extensive reservoir reconstruction and form complicated crack could to be opened
Hair.The ability of complex fracture is formed when fine and close oil-gas reservoir pressure break by rock brittleness, intrinsic fracture development degree and occurrence and ground
The factors such as stress state influence, these three factors of currently available technology Main Basiss generate network fracture to fine and close oil gas pressure break
Ability is qualitatively judged, however, difficult using the method field conduct qualitatively judged, it is difficult to effectively fracturing optimizing be instructed to set
Meter, if a kind of side that can integrate these three because of usually quantitative assessment densification oil gas pressure break generation network fracture ability can be provided
Method will be very important.
Invention content
In order to solve the above technical problems, it is formed when the present invention provides a kind of quantitative assessment densification oil-gas reservoir hydraulic fracturing
The method of complex fracture ability.The present invention splits complexity in analysis rock brittleness, intrinsic fracture occurrence and crustal stress states respectively
On the basis of seam influences, comprehensive three kinds of factors establish an evaluation method, to be fine and close hydrocarbon reservoiring network fracture
Ability provides quantitative evaluation method.
Specifically, including technical solution below：
A method of the fine and close oil gas pressure break of evaluation forms network fracture ability, and this method includes：
A method of the fine and close oil gas pressure break of evaluation forms network fracture ability, which is characterized in that this method includes：
(1) basic parameter of the basic parameter and target well fractured layer of fine and close oilfield to be evaluated is obtained；
(2) according to the basic parameter, the normalized Young's modulus E of the target well fractured layer is calculatedn, dilative angle ψn
With peak strain εpn；According to the normalized Young's modulus En, dilative angle ψnWith peak strain εpn, calculate the target well pressure
The brittleness index B of partingI；
(3) according to the basic parameter, intrinsic fracture factor F is calculated separatelynWith crustal stress factor SI, according to described natural
Crack factor FnWith the crustal stress factor SI, calculate the seam net spreading factor F of the target well fractured layernf；
(4) according to the brittleness index BIWith the seam net spreading factor Fnf, calculate the seam net of the target well fractured layer
Index FI；
(5) according to the seam net index FIWith the seam net index F pre-establishedIValue and formed network fracture ability between
Correspondence, evaluate the ability that the target well fractured layer forms network fracture.
Further, the basic parameter of the fine and close oilfield to be evaluated includes：The Young mould of the densification oilfield
The maximum value E of amountmaxWith minimum value Emin, dilative angle maximum value ψmaxWith minimum value ψmin, peak strain maximum value εpmaxWith
Minimum value εpmin, horizontal principal stress maximum value σHmaxWith minimum value σhmax, the maximum angle in hydraulic fracture face and intrinsic fracture face
θmax；The basic parameter of the target well fractured layer includes：Young's modulus E, dilative angle ψ, the peak strain ε of target wellp, waterpower
The angle theta in fracture surface and intrinsic fracture face, maximum horizontal crustal stress σHWith minimum level crustal stress σh。
Preferably, the brittleness index B of the target well fractured layerISpecific calculation be：BI=W1En+W2ψn+
W3εpn, wherein W1, W2, W3For normalized Young's modulus En, dilative angle ψnWith peak strain εpnWeight coefficient, and W1+W2+
W3=1.
Preferably, the normalized Young's modulus EnCalculation be：It is described normalized
Dilative angle ψnCalculation be：The normalized peak strain εpnCalculation be：
Preferably, the seam net spreading factor F of the target well fractured layernfCalculation be：Fnf=W4Fn+W5SI,
In, W4, W5For the intrinsic fracture factor FnWith the crustal stress factor SIWeight coefficient, and W4+W5=1.
Preferably, the crustal stress factor SICalculation be：The intrinsic fracture
Factor FnCalculation formula be:Wherein, σnmIt is that described fine and close oilfield is maximum naturally splits
Seam opens stress value, σnm=(σHmax-σhmin)sin2θmax。
Further, the seam net index F of the target well fractured layerICalculation be：FI=BI·Fnf。
Further, described according to seam net index FIWith the seam net index F pre-establishedIValue with formed network fracture energy
Correspondence between power, the ability for evaluating the target well fractured layer formation network fracture include：As the seam net index FI
When≤0.25, the target well fractured layer cannot form network fracture；When 0.25<FIWhen≤0.4, the target well fractured layer shape
It is general at the ability of network fracture；Work as FIWhen ＞ 0.4, the ability that the target well fractured layer forms network fracture is stronger.
The advantageous effect of technical solution provided in an embodiment of the present invention：Provide a kind of quantitative assessment densification oil-gas reservoir waterpower
The method that complex fracture ability is formed when pressure break.This method can more accurately evaluate the complicated journey of compact reservoir fracturing fracture
Degree.Specifically, this method considers the factors such as rock brittleness, intrinsic fracture occurrence and crustal stress states, combines fine and close oil
The higher rock Young's modulus of gas reservoir brittleness correlation, dilative angle and peak strain, and determine the natural of crack extended mode
Fracture open and crustal stress difference to be formed the ability of complex fracture when quantitative assessment reservoir fracturing, instruct Optimized fracturing design,
The complexity for improving fine and close oil-gas reservoir fracturing fracture, reaches preferable effect of increasing production.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the step for the method that the fine and close oil gas pressure break of a kind of evaluation provided in an embodiment of the present invention forms network fracture ability
Rapid figure.
Specific implementation mode
To keep technical scheme of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.Unless otherwise defined, all technical terms used in the embodiment of the present invention all have and art technology
The normally understood identical meaning of personnel.
The present invention provides a kind of method that the fine and close oil gas pressure break of evaluation forms network fracture ability, and the present invention stitches net in structure
Index FIBefore, by a large amount of theoretical research and field practice, obtain rock Young's modulus, dilative angle and peak strain be with
The higher factor of rock brittleness correlation, and intrinsic fracture open and crustal stress difference be determine crack extended mode it is main because
Element.On this basis, the brittleness index B of structure reflection rock brittlenessIFunction (Young's modulus En, dilative angle ψnWith peak strain εpn
For variable) and reflection intrinsic fracture development degree and occurrence and crustal stress states seam net spreading factor FnfFunction (considers natural
The opening in crack, and stress difference in combination), and further establish brittleness index BI, seam net spreading factor FnfWith seam net index
FIBetween functional relation, finally according to seam net index FIValue evaluation goal well fractured layer formed network fracture ability.Specifically
Ground, as shown in Figure 1, this approach includes the following steps：
The first step：Obtain the basic parameter of the basic parameter and target well fractured layer of fine and close oilfield to be evaluated.
The basic parameter of the fine and close oilfield to be evaluated includes：The maximum value of the Young's modulus of the densification oilfield
EmaxWith minimum value Emin, dilative angle maximum value ψmaxWith minimum value ψmin, peak strain maximum value εpmaxWith minimum value εpmin、
The maximum value σ of horizontal principal stressHmaxWith minimum value σhmax, the maximum angle θ in hydraulic fracture face and intrinsic fracture facemaxEtc.；
The basic parameter of the target well fractured layer includes：Young's modulus E, dilative angle ψ, the peak strain ε of target wellp、
The angle theta in hydraulic fracture face and intrinsic fracture face, maximum horizontal crustal stress σHWith minimum level crustal stress σhEtc..
Second step：According to above-mentioned basic parameter, the normalized Young's modulus E of target well fractured layer is calculatedn, dilative angle ψn
With peak strain εpn。
First choice passes through the Young's modulus E to target fractured layern, dilative angle ψnWith peak strain εpnOperation is normalized,
Its numerical value is unified between 0-1, making the data of separate sources unified under a referential, and specific calculation is as follows：
Normalized Young's modulus EnCalculation be：Normalized dilative angle ψnCalculating side
Formula is：With normalized peak strain εpnCalculation be：
Third walks：According to above-mentioned normalized Young's modulus En, dilative angle ψnWith peak strain εpn, calculate target well pressure break
The brittleness index B of layerI；
The brittleness index B of target well fractured layerISpecific calculation can be：BI=W1En+W2ψn+W3εpn, wherein
W1, W2, W3For normalized Young's modulus En, dilative angle ψnWith peak strain εpnWeight coefficient, and W1+W2+W3=1.One
In the possible embodiment of kind (for example being suitable for Dagang Oilfield tight sand), W can be obtained1=0.262, W2=0.353, W3=
0.385。
4th step：According to above-mentioned basic parameter, intrinsic fracture factor F is calculated separatelynWith crustal stress factor SI；
The crustal stress factor SICalculation can be：The intrinsic fracture because
Sub- FnCalculation formula can be:Wherein, σnmIt is that the fine and close oilfield is maximum natural
Fracture open stress value, σnm=(σHmax-σhmin)sin2θmax。
5th step：According to intrinsic fracture factor FnWith crustal stress factor SI, calculate the seam net spreading factor of target well fractured layer
Fnf；
The seam net spreading factor F of target well fractured layernfCalculation be：Fnf=W4Fn+W5SI, wherein W4, W5For day
Right crack factor FnWith crustal stress factor SIWeight coefficient, and W4+W5=1, in a kind of possible embodiment (such as it is suitable
For Dagang Oilfield tight sand), W can be obtained4=0.52, W5=0.48, under normal circumstances, W can be used4=0.5, W5=
0.5。
6th step：According to above-mentioned brittleness index BIWith seam net spreading factor Fnf, calculate target well fractured layer seam net refer to
Number FI；
Based on theoretical research and field practice, F can be usedI=BI·FnfTo calculate seam net index FI, FIValue 0-1 it
Between.
7th step：According to seam net index FIWith the seam net index F pre-establishedIValue and formed network fracture ability between
Correspondence, evaluation goal well fractured layer formed network fracture ability.
The seam net index F pre-establishedIValue and formed network fracture ability between correspondence, be study it is to be evaluated
It is being set up on the basis of the fine and close oilfield of valence and the lot of experimental data of multiple fractured layers, can be used in evaluating the densification
Other target well fractured layers form the model of network fracture ability, seam net index F in oilfieldIIt is evaluation goal well fractured layer shape
At the index of network fracture ability, seam net index FIIt is bigger, illustrate that the ability in target well fractured layer formation complex network crack is got over
By force.
In a kind of possible embodiment, net index F is stitchedIValue and formed network fracture ability between correspondence
Can be：As seam net index FIWhen≤0.25, target well fractured layer cannot form network fracture；When 0.25<FIWhen≤0.4, target
The ability that well fractured layer forms network fracture is general；Work as FIWhen ＞ 0.4, target well fractured layer formed network fracture ability compared with
By force.
The seam net index specific implementation mode of the present invention is described in further detail with reference to specific example：
The basic parameter of Dagang Oilfield densification oilfield is as follows：Young's modulus maximum value is 29038MPa, and minimum value is
9482MPa；Dilative angle maximum value is 6.6 °, and minimum value is 2.2 °；Peak strain maximum value is 2.7%, minimum value 0.5%,
The maximum angle in horizontal principal stress maximum value 70MPa, minimum value 50MPa, hydraulic fracture face and intrinsic fracture face is 90 °
The basic parameter of the block fractured well fractured layer is as follows：Young's modulus is 23535MPa, and dilative angle is 4.2 °, peak
Value strain is 1.43%, and hydraulic fracture face and the angle in intrinsic fracture face are 45 °, maximum horizontal principal stress 64MPa, minimum water
Flat principal stress is 56MPa.
It can be calculated separately to obtain normalized Young's modulus E according to above-mentioned computational methodsnFor 0.719, it is normalized cut it is swollen
Angle ψnFor 0.455, normalized peak strain εpnIt is 0.577；
Further, weight coefficient W is taken1=0.262, W2=0.353, W3=0.385, reservoir fracturing interval is calculated
Brittleness index BIIt is 0.571；
Determine that the maximum intrinsic fracture of block opens stress value σnm=20MPa, and intrinsic fracture factor F is calculatedn=
0.8 and crustal stress factor SI=0.6, then take W4=0.5, W5=0.5, calculate the seam net spreading factor F of target well fractured layernf
=0.7；
According to the brittleness index B being calculatedIWith seam net spreading factor Fnf, calculate the seam net index F of target well fractured layerI
=0.4；
According to seam net index F pre-establishing, suitable for the densification blockIValue and formed network fracture ability between
Correspondence, judge the target well fractured layer formed network fracture ability it is stronger.
The embodiment of the present invention is analyzing rock brittleness, intrinsic fracture occurrence and crustal stress states to complex fracture influence respectively
On the basis of, integrate the method that three kinds of factors establish a quantitative assessment densification hydrocarbon reservoiring network fracture ability.Specifically
Ground, this method consider the factors such as rock brittleness, intrinsic fracture occurrence and crustal stress states, combine fine and close oil-gas reservoir brittleness
The higher rock Young's modulus of correlation, dilative angle and peak strain, and determine that the intrinsic fracture of crack extended mode opens
With crustal stress difference, to be formed the ability of complex fracture when quantitative assessment reservoir fracturing, guidance is provided to Optimized fracturing design, from
And the complexity of fine and close oil-gas reservoir fracturing fracture is improved, reach preferable effect of increasing production.
The above is merely for convenience of it will be understood by those skilled in the art that technical scheme of the present invention, not limiting
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection domain of invention.
Claims (8)
1. a kind of method that the fine and close oil gas pressure break of evaluation forms network fracture ability, which is characterized in that this method includes：
(1) basic parameter of the basic parameter and target well fractured layer of fine and close oilfield to be evaluated is obtained；
(2) according to the basic parameter, the normalized Young's modulus E of the target well fractured layer is calculatedn, dilative angle ψnThe peak and
It is worth strain stresspn；According to the normalized Young's modulus En, dilative angle ψnWith peak strain εpn, calculate the target well fractured layer
Brittleness index BI；
(3) according to the basic parameter, intrinsic fracture factor F is calculated separatelynWith crustal stress factor SI, according to the intrinsic fracture
Factor FnWith the crustal stress factor SI, calculate the seam net spreading factor F of the target well fractured layernf；
(4) according to the brittleness index BIWith the seam net spreading factor Fnf, calculate the seam net index of the target well fractured layer
FI；
(5) according to the seam net index FIWith the seam net index F pre-establishedIValue and formed network fracture ability between pair
It should be related to, evaluate the ability that the target well fractured layer forms network fracture.
2. according to the method described in claim 1, it is characterized in that, the basic parameter packet of the fine and close oilfield to be evaluated
It includes：The maximum value E of the Young's modulus of the densification oilfieldmaxWith minimum value Emin, dilative angle maximum value ψmaxAnd minimum value
ψmin, peak strain maximum value εpmaxWith minimum value εpmin, horizontal principal stress maximum value σHmaxWith minimum value σhmax, waterpower splits
The maximum angle θ in seam face and intrinsic fracture facemax；
The basic parameter of the target well fractured layer includes：Young's modulus E, dilative angle ψ, the peak strain ε of target wellp, waterpower splits
The angle theta in seam face and intrinsic fracture face, maximum horizontal crustal stress σHWith minimum level crustal stress σh。
3. according to the method described in claim 1, it is characterized in that, the brittleness index B of the target well fractured layerITool
Body calculation is：BI=W1En+W2ψn+W3εpn, wherein W1, W2, W3For normalized Young's modulus En, dilative angle ψnAnd peak value
Strain stresspnWeight coefficient, and W1+W2+W3=1.
4. according to the method described in claim 3, it is characterized in that, the normalized Young's modulus EnCalculation be：The normalized dilative angle ψnCalculation be：The normalized peak
It is worth strain stresspnCalculation be：
5. according to claim 1 method, which is characterized in that the seam net spreading factor F of the target well fractured layernfCalculating
Mode is：Fnf=W4Fn+W5SI, wherein W4, W5For the intrinsic fracture factor FnWith the crustal stress factor SIWeight system
Number, and W4+W5=1.
6. according to the method described in claim 5, it is characterized in that, the crustal stress factor SICalculation be：The intrinsic fracture factor FnCalculation formula be:
Wherein, σnmIt is that the fine and close maximum intrinsic fracture of oilfield opens stress value, σnm=(σHmax-σhmin)sin2θmax。
7. according to the method described in claim 1, it is characterized in that, the seam net index F of the target well fractured layerIMeter
Calculation mode is：FI=BI·Fnf。
8. according to the method described in claim 1, it is characterized in that, described according to seam net index FIRefer to the seam net pre-established
Number FIValue and form the correspondence between network fracture ability, evaluate the energy that the target well fractured layer forms network fracture
Power includes：As the seam net index FIWhen≤0.25, the target well fractured layer cannot form network fracture；When 0.25<FI≤
When 0.4, the ability that the target well fractured layer forms network fracture is general；Work as FIWhen ＞ 0.4, the target well fractured layer is formed
The ability of network fracture is stronger.
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| CN115455632B (en) * | 2021-12-31 | 2023-08-29 | 中国石油天然气股份有限公司 | Fracturing optimization design method and system for scale and morphology collaborative optimization |
| CN115422718A (en) * | 2022-08-10 | 2022-12-02 | 中海石油(中国)有限公司海南分公司 | Method for quickly optimizing fracturing interval |
| CN115422718B (en) * | 2022-08-10 | 2023-07-07 | 中海石油(中国)有限公司海南分公司 | Method for rapidly optimizing fracturing interval |
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