CN107229989A - A kind of staged fracturing of horizontal well cluster optimization of perforation method - Google Patents
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Abstract
The invention discloses a kind of staged fracturing of horizontal well cluster optimization of perforation method.Pass through this method, it can set up a kind of while considering the synthesis compressibility exponential model of reservoir geology dessert and engineering dessert, the dessert position of reservoir and crisp plasticity are determined using the model, extend principle according to major fracture randomness, zygotic induction stress and Kong Zhaoxia integrate the optimal cluster length of determination and number of clusters.The present invention can reduce the risk to form invalid and poorly efficient crack, accurate guidance can be provided for the setting of staged fracturing of horizontal well cluster perforating scheme, optimum results can be significantly greatly increased transformation volume, be obviously improved construction effect, so as to obtain the economic benefit of maximum.
Description
Technical field
The present invention relates to technical field of petroleum extraction, more particularly to a kind of staged fracturing of horizontal well cluster optimization of perforation side
Method.
Background technology
Shower hole conceptual design is most important in staged fracturing of horizontal well design.It is not only related to the crack initiation position in crack
Put and Number of Fractures judgement, be also related to the judgement that adjacent slits are disturbed with the presence or absence of seepage flow and stress is disturbed, final influence
Effect after volume and pressure is transformed to crack.
0.3~0.6m of external typical shale gas horizontal well shower hole length, cluster 5~30m of spacing, 3~10 clusters/section.With
The popularization and application of Zhe Jing factories fracturing technique, well spacing is reduced to 80~150m by 500~600m, the number of clusters of every section of pressure break also by
2~3 clusters rise to 5~10 clusters, therefore can be by reservoir thoroughly " smashing ", and the more domestic current level of reservoir reconstruction volume significantly rises
It is high.Although the raising of drilling hole number and pressure break hop count can increase cost, with increasing for the single platform well number of well factory
(an external platform is up to 50 multiple wells), operating efficiency is greatly improved, and is drilled well and pressure break inter process seamless connection, respectively
The repeatable utilization of working fluid is planted, and single hop pressure break scale is gradually decreased, and average individual well expense can decline to a great extent.Meanwhile, between cluster
Away from reduction add stress interference between seam, the synchronous pressure breaks of many wells or zip mode pressing crack construction pattern have been further exacerbated by between seam
Stress is disturbed, and the probability for forming complex fracture is also significantly improved.Foreign data shows that the well yield of well factory pressure break can
18% or so is improved than conventional individual well pressure break pattern.Therefore, the input-output ratio of well factory pressure break pattern has great advantage.
In addition, with the increase of perforation number of clusters, it is proposed that carry out temporarily stifled " broadband " fracturing technique at perforation eye and the nearly pit shaft in crack,
To increase the possibility of other cluster fracture initiations, it is ensured that effectively transform the maximization of volume in horizontal well crack.
The domestic typical a length of 1~1.5m of shale gas horizontal well perforation cluster even more than 2m, every section of 2~3 clusters.Early stage is general
Take the method along the uniform cloth cluster of horizontal wellbore.Recently with the raising to reservoir heterogeneity awareness, non-homogeneous cloth cluster
It is more common.But, at present there is problems with domestic shower hole：
1st, current perforating site determines method, and invalid and poorly efficient crack ratio is higher
Gas-producing profile result is shown after existing pressure, the gas production of 1/3 perforation cluster crack contribution 75%, in addition 1/3
The gas production of cluster crack contribution 25%, remaining 1/3 is invalid perforation cluster.In other words, poorly efficient or invalid shower hole count is occupied
2/3 or so of total perforation cluster.The problem of foreign countries also have same substantially.Trace it to its cause and be the strong anisotropism of reservoir, rely on
The limited log data of horizontal segment is difficult to the double dessert indexs for holding reservoir exactly.The effective of double desserts is determined if can find
Method, while fracturing effect is ensured, can save the pressure break expense of more than half, be advantageously implemented shale gas pressure break drop originally
The target of synergy.
2nd, cluster spacing is generally bigger than normal
Cluster spacing is generally 20-30m, high 3-4 times compared with external.Although 20-30m can produce induced stress in theory
Disturbing effect (induced stress difference is higher than original level stress difference), but the distance of this calculating is the upper limit of optimal cluster spacing,
Actually cluster spacing more gap is easier turns to.And the computation model of current induced stress is general using Linear elastic mechanics as base
Plinth, for clay content high clastic rock or shale, the induced stress transmission calculated is apart from bigger than normal, but this error at present
Can not effectively it eliminate.
3rd, the perforating length (abbreviation cluster length) of single cluster is universal bigger than normal
Cluster length is generally 1-2m, and more than 3 times are generally increased than external.Increase cluster length, which can be improved, produces the several of many seams in cluster
Rate.External cluster length is smaller, although each eyelet possible feed liquor during beginning, and the crack of crack initiation is extended in parallel each other,
But because the anisotropism of reservoir, longer, wider crack can produce larger induced stress during extension, due to cluster
Length is small, and this induced stress can be covered rapidly in the lateral extent of cluster length, and the induced stress of this superposition can increase other adjacent
The difficulty of crack crack initiation and extension.In other words, main seam extends better in cluster, and the effect suppressed to other cracks is stronger,
It is possible to just strangle the development of secondary fracture in early days, ultimately results in only one major fracture.And it is domestic because cluster length is longer, it is above-mentioned
The induced stress of described major fracture may be not enough to suppress the development of the secondary fracture of other distances relatively far away from.In other words,
Cluster length is longer, and the cracky probability of appearance is bigger in cluster, there may come a time when that fracture length will be with design with matching for well spacing
Anticipation situation greatly differs from each other.Such result may finally be formed：Same perforation sum in every section, and the total bar in crack of crack initiation
Number is the same, but external crack is stitched for one per cluster, and quite, the transformation volume in crack is big for mutual distribution distance；And the country is every
One or more crack of cluster, cluster internal fissure interferes because distance is too small, influence between yield, cluster crack and far apart, exists
The region do not involved between cluster by fisstured flow.Therefore, transformation volume in crack is greatly reduced, and has a strong impact on effect after pressure.
In summary, need badly and set up a kind of staged fracturing of horizontal well cluster optimization of perforation method, being effectively prevented from or
Slow down above-mentioned limitation, to tackle the severe situation of current low oil price, improve the economic benefit of oil gas field unit.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of water for being applied to fine and close oil-gas reservoir and shale oil-gas reservoir
Horizontal well staged fracturing cluster optimization of perforation method, to reduce the formation in invalid and poorly efficient crack, improving volume fracturing transformation effect
Fruit provides solid foundation.
A kind of staged fracturing of horizontal well cluster optimization of perforation method, comprises the following steps：
Step S101, sets up the geology dessert index model and engineering dessert index model of reservoir；
Step S102, by carrying out weight distribution to geology dessert index model and engineering dessert index model, sets up storage
The synthesis compressibility exponential model of layer；
Step S103, according to the weight coefficient of weight distribution in actual exploration modified result step S102, so as to be repaiied
Synthesis compressibility exponential distribution after just, and the dessert position of reservoir and crisp plasticity are judged accordingly；
Step S104, analysis crack initiation extends to the probability of major fracture, is ensuring only have a major fracture extension in a cluster
On the premise of, zygotic induction stress determines the upper limit of cluster length, and the lower limit of cluster length is determined with reference to Kong Zhaoxia；
Step S105, every section of number of clusters is determined according to crisp plasticity.
According to embodiments of the present invention, in above-mentioned steps S101, the geology dessert that can calculate reservoir by following formula refers to
Mark, sets up geology dessert index model：
In formula, SGFor geology dessert index, dimensionless；SiFor the normalized value of reservoir parameter；X is specific for reservoir parameter
Value；MaxX and minX are respectively the minimum value and maximum of the reservoir parameter；wiFor the weight coefficient of reservoir parameter；N is parameter
Number.
According to embodiments of the present invention, in above-mentioned steps S101, can the fracture pressure curve based on every section of pressing crack construction, lead to
The engineering dessert index that following formula calculates reservoir is crossed, engineering dessert index model is set up：
In formula, SEFor engineering dessert index, dimensionless；ST0TCBDAnd ST0TCCDThe respectively fracture pressure curve of pressing crack construction
The area of the fragility overlay area of institute's envelope and the area of plasticity overlay area, unit is MPamin.
According to embodiments of the present invention, in above-mentioned steps S102, the synthesis compressibility of reservoir can be calculated by following formula
Index, so as to set up comprehensive compressibility exponential model：
FI=(SG, SE)(w1, w2)T
In formula, FI is comprehensive compressibility index, dimensionless；SGFor geology dessert index, dimensionless；SERefer to for engineering dessert
Mark, dimensionless；w1And w2The respectively weight coefficient of geology dessert index and engineering dessert index.
According to embodiments of the present invention, in above-mentioned steps S103, the actual exploration result can be that liquid/gas yield is cutd open after pressing
Face result.
According to embodiments of the present invention, in above-mentioned steps S104, it is possible to use based on probability distribution function analysis crack initiation extension
The probability in crack, wherein when probability distribution function value is more than or equal to 0.5, indicating fracture initiation/extend to major fracture.
According to embodiments of the present invention, in above-mentioned steps S104：
Plate can be calculated according to given induced stress to calculate the induced stress of major fracture generation to correct horizontal stress
Difference, then calculates corresponding formation fracture pressure by following formula：
Pf=2 σmin-Δσh-Pi+T
In formula, PfFor formation fracture pressure, unit is MPa；σminFor minimum horizontal principal stress, unit is MPa；ΔσhFor two
Poor to horizontal stress, unit is MPa；PiFor strata pressure, unit is MPa；T is tensile strength, and unit is MPa；
Wherein, the upper limit of cluster length will make the shaft bottom pressure that the formation fracture pressure is more than at the horizontal wellbore of this cluster of correspondence
Power, to ensure that only having a major fracture in cluster extends.
According to embodiments of the present invention, in above-mentioned steps S104, the lower limit of cluster length will make the construction pressure influenceed by Kong Zhaoxia
Power is less than well head pressure limiting, to ensure pressing crack construction normal operation.
According to embodiments of the present invention, in above-mentioned steps S105, if reservoir is fragility reservoir, every section of number of clusters is 4 to 6 first
Cluster, is then gradually lifted to 8 to 10 clusters.
According to embodiments of the present invention, in above-mentioned steps S105, if reservoir is plasticity reservoir, every section of number of clusters is 1 to 2 cluster or 3
To 4 clusters.
Compared with prior art, one or more embodiments of the invention can have the following advantages that：
The synthesis compressibility exponential model that the present invention is set up considers reservoir geology dessert and engineering dessert simultaneously, and true accordingly
Determine the dessert position of reservoir and crisp plasticity, principle is extended according to major fracture randomness, zygotic induction stress and Kong Zhaoxia etc. are real
Border condition of construction synthetically determines optimal cluster length and number of clusters so that design is more scientific and reasonable, simple and effective, can basis
Reservoir characteristic obtains optimal cluster perforating parameter.Moreover, the optimum results obtained can effectively instruct pressing crack construction, hence it is evident that drop
Low invalid crack, significantly improves construction effect, so as to obtain the economic benefit of maximum.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and obtained in claim and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for specification, the reality with the present invention
Apply example to be provided commonly for explaining the present invention, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the flow chart according to staged fracturing of horizontal well cluster optimization of perforation method of the present invention；
Fig. 2 is the calculating schematic diagram of the engineering dessert index according to an example of the invention；
Fig. 3 is the schematic diagram that plate is calculated according to the induced stress of an example of the invention；
Fig. 4 is the schematic diagram of shale gas well fracturing section contribution to yield rate according to embodiments of the present invention.
Embodiment
It is contemplated that set up a kind of while considering the synthesis compressibility exponential model of reservoir geology dessert and engineering dessert,
The dessert position of reservoir and crisp plasticity are determined by the model, according to major fracture randomness extend principle, zygotic induction stress and
Kong Zhaoxia integrates the optimal cluster length of determination and number of clusters.
To make the object, technical solutions and advantages of the present invention clearer, with reference to embodiments with accompanying drawing to the present invention
It is described in further detail.
As shown in figure 1, the method for the present invention is mainly included the following steps that in the specific implementation.
Step S101, sets up the geology dessert index model and engineering dessert index model of reservoir.
1. geology dessert model is set up
Consider porosity, permeability, containing the ginseng such as (oil) gas, strata pressure, intrinsic fracture and mechanical properties of rock
Number, using method for normalizing, is the numerical value between [0,1] by each parameter value, then (also may be used certainly using expert judging method
Not limited to this) the weight distribution coefficient of each parameter is determined, geology dessert index is calculated by below equation, so as to set up geology
Dessert model：
In formula, SGFor geology dessert index, dimensionless；SiFor the normalized value of reservoir parameter；X is a certain reservoir parameter
Occurrence；MaxX and minX are respectively the minimum value and maximum of the reservoir parameter；wiFor the weight coefficient of reservoir parameter；N is
The number of parameter.
In the context of the present invention, so-called patent judges method and refers to collect what expert in the art technical staff was provided
These there is abnormal data in authoritative data (data for exceeding specified range) to reject, then take its average value by data
Method.
2. engineering dessert model is set up
In the art, engineering dessert is mainly the brittleness index of reservoir.The domestic and international computation model on brittleness index
Have a lot, the mineral constituent based on rock having, have based on rock mechanics parameters, but result of calculation difference is huge, and
A bite well can only often calculate a value, and the directiveness to staged fracturing of horizontal well is not strong.Therefore, the present invention proposes that foundation passes through
The fracture pressure curve of every section of pressing crack construction asks for the new model of reservoir brittleness index.
Fig. 2 shows the fracture pressure curve (ordinate P is pressure) for calculating engineering dessert, is calculated and stored up by following formula
The engineering dessert index of layer, sets up engineering dessert index model：
In formula, SEFor engineering dessert index, dimensionless；ST0TCBDFor polygon under the fracture pressure curve shown in Fig. 2
T0TCBDT0The area of the area, also referred to as fragility overlay area of institute's envelope, ST0TCCDTo be many on the fracture pressure curve shown in Fig. 2
Side shape T0TCCDT0The area of the area, also referred to as plasticity overlay area of institute's envelope, units MPa min.In addition, can be with during construction
Brittle quality is intuitively judged by shade mark part in Fig. 2, fragility is poor if shaded area is larger, on the contrary then fragility
It is good.
Step S102, sets up the synthesis compressibility exponential model of reservoir.
The step (assigns weight system by carrying out weight distribution to geology dessert index model and engineering dessert index model
Number), the synthesis compressibility index of reservoir is calculated by following formula, reservoir geology dessert and engineering sweet tea are considered so as to set up
The comprehensive compressibility exponential model of point：
FI=(SG, SE)(w1, w2)T
In formula, FI is comprehensive compressibility index, dimensionless；SGFor geology dessert index, dimensionless；SERefer to for engineering dessert
Mark, dimensionless；w1And w2(it is different from the w in geology dessert index calculating formula1And w2) it is respectively geology dessert index and engineering sweet tea
The weight coefficient of point index.
Step S103, the comprehensive compressibility exponential model of amendment, and the dessert position of reservoir and crisp plasticity are judged accordingly.
The step explores result according to actual, such as (liquid) gas yield section result after preferred pressure, in amendment step S102
The weight coefficient w of weight distribution1And w2, it is distributed with obtaining revised comprehensive compressibility exponential model, and judge reservoir accordingly
Dessert position and crisp plasticity.Generally, comprehensive compressibility exponential model is a curve, is determined by searching the peak of the curve
The dessert position of reservoir, and determine according to its size the crisp plasticity of reservoir.
Step S104, analysis crack initiation extends to the probability of major fracture, is ensuring only have a major fracture extension in a cluster
On the premise of, zygotic induction stress determines the upper limit of cluster length, and the lower limit of cluster length is determined with reference to Kong Zhaoxia.
1. the upper limit of single hop cluster length is determined
Due to being influenceed by reservoir heterogeneity, whether produced per each perforation eye in cluster independent crack have greatly with
Machine, therefore can each eyelet normal binding characteristic of the crack initiation also in compliance with probability distribution function when starting.For example, in this implementation
Example in, when probability distribution function numerical value be more than 0.5 when, represent eyelet can crack initiation, be otherwise unable to crack initiation.As for the eyelet of crack initiation
It can extend down always, also in compliance with the feature of same probability distribution function.For example, in the present embodiment, working as random distribution
Function value is more than 0.5, represents that crack may extend away as major fracture, otherwise can not extend to major fracture.
Plate is calculated according to the induced stress shown in Fig. 3 to calculate the induced stress of large fracture generation to correct horizontal stress
Difference, then corresponding formation fracture pressure is calculated by following formula：
Pf=2 σmin-Δσh-Pi+T
In formula, PfFor formation fracture pressure, units MPa；σminFor minimum horizontal principal stress, units MPa；ΔσhFor two to water
Horizontal stress is poor, units MPa；PiFor strata pressure, units MPa；T is tensile strength, units MPa.
If in the introduction it has been already mentioned that the fracture pressure is more than the shaft bottom pressure at the horizontal wellbore of this cluster of correspondence
Power, then in the vicinity of large fracture, gap is difficult to continue to extend.In the present invention, the design principle of optimal cluster parameter is to protect
Only one of which major fracture extension in a cluster is demonstrate,proved, optimal cluster length and number of clusters are determined by this standard.Sum it up, the upper limit of cluster length
The bottom pressure for making the formation fracture pressure be more than at the horizontal wellbore of this cluster of correspondence, to ensure that only having a master in cluster splits
Seam extension.General maximum cluster length should be less than 1m and be advisable.
3. the lower limit of single hop cluster length is determined
In the introduction it has been already mentioned that in general, cluster length is smaller, the extension probability of single major fracture is bigger.But
Cluster length can not be too small, and otherwise high discharge capacity can cause high Kong Zhaoxia, causes shaft bottom abnormal pressure, in some instances it may even be possible to more than well head
Pressure limiting and pressing crack construction operation can not be normally carried out.In general, per hole flow in 0.2~0.3m3/ min is advisable, if it exceeds
Then Kong Zhaoxia is high for this scope, if less than influenceing the intensity of rebuilding if this scope, and is easily caused in cluster more seam crack initiations,
Have a strong impact on final effect.Sum it up, operation pressure that the lower limit of cluster length will make to be influenceed by Kong Zhaoxia (namely well head pressure
Power) it is less than well head pressure limiting, to ensure pressing crack construction normal operation.
At present, shale gas horizontal well construction discharge capacity is general in 12~16m3/ min, single hop perforation cluster total length is 3m, Kong Mi
Spend for 20 holes/m, single hole flow can be made to be maintained at 0.2~0.3m3/min.General most tuftlet length should be greater than 0.3m and be advisable (in list
Section number of clusters is less than under conditions of 10).
Step S104, determines the number of clusters of single hop
External every section of number of clusters is up to 8 to 10 clusters, domestic then usually 2 to 3 clusters.Change in view of well factory pressure break fracture
The active demand of volume maximization is made, in the range of capacity of equipment, the number of clusters for gradually stepping up perforation has become undisputable fact.
But, for fragility reservoir and plasticity reservoir, the design of perforation number of clusters still has than larger difference.The present invention is according to reservoir
Crisp plasticity determines every section of number of clusters.Concrete mode is as follows：
1. fragility reservoir：
For fragility reservoir, every section of perforation number of clusters is first 4 to 6 clusters, is then gradually lifted to 8 to 10 clusters.Because fragility
Reservoir Fracture is easy to crack initiation, so being possible to newly stitch crack initiation under small displacement, can have new crack to rise successively under high discharge capacity
Split.Moreover, in the case that number of clusters is less, with the increase of discharge capacity and liquid measure, the width in crack do not increase how much, phase
Counter is that the length in crack is added.So, fragility reservoir uses many shower holes, can't influence the width of every crack, once
The sand liquor ratio for adding sand is controlled, does not also interfere with and normally adds sand, the situation that early stage sand plug is not resulted in more occurs.
2. plasticity reservoir：
For plasticity reservoir, typically require that number of clusters is more few better, such as 1 to 2 cluster, or even single cluster perforation.The strong ground of plasticity
Layer, although fracture initiation is difficult with extension, but crack once occurs, and the width in crack can be relatively wide, it is possible to achieve higher
Sand liquor ratio construction.For relative brittleness reservoir fracturing, the design of sand liquor ratio can be relatively higher, also may be used per cluster crack sand feeding amount
With appropriate some more.But it is due to that plasticity is strong, slotted wall compacted fill ground may be relatively strong, sealed fracture technology after combined pressure should be matched somebody with somebody, dredged again
It is logical even to improve the reservoir porosity near sides of fracture, to recover or improve the energy of fluid in reservoir matrix to fisstured flow
Power.It is less in view of every section of perforation number of clusters, in order to improve Number of Fractures, it is also contemplated that many shower holes in every section (such as every section 3 to
4 clusters), but broadband fracturing technique (solid temporarily blocks up particle and the temporarily mixture of stifled fiber) must be coordinated, to improve plasticity storage
The crack transformation volume of layer.
Embodiment
The present invention is applied in the design of river southeast shale gas staged fracturing of horizontal well cluster optimization of perforation,
Well vertical depth 2402m, depth measurement 4100m, horizontal segment length 1530m.By method provided by the present invention, optimize shower hole site,
Obtain optimal cluster perforating parameter as follows：The cluster of perforation 50 is designed, wherein the 1st section of every section of two clusters, per cluster 1.5m；2-17 sections every section three
Cluster, per cluster 1m；Aperture 9.5mm.Successfully solve that shale gas reservoir is invalid and poorly efficient crack proportion is high, pressure through field conduct
Split the technical barriers such as transformation limited potential.Production profile logging explanation, fracturing section contribution to yield rate such as Fig. 4 institutes have been carried out to the well
Show.In Fig. 4, Stage represents pressure break series.As shown in Figure 4, except the 4th and 11 section without yield, the 12nd section of contribution to yield rate it is low it
Outside, the fracturing section ratio for having larger aerogenesis contribution rate is up to 82%.The optimization method provided by the present invention, the well tires out for 5 months
Gas production obtains significant economic benefit with improving 14% compared with the other a bite well of platform.
It is described above, it is only the specific implementation case of the present invention, protection scope of the present invention is not limited thereto, any ripe
Those skilled in the art are known in technical specification of the present invention, modifications of the present invention or replacement all should be in the present invention
Protection domain within.
Claims (10)
1. a kind of staged fracturing of horizontal well cluster optimization of perforation method, comprises the following steps：
Step S101, sets up the geology dessert index model and engineering dessert index model of reservoir；
Step S102, by carrying out weight distribution to geology dessert index model and engineering dessert index model, sets up reservoir
Comprehensive compressibility exponential model；
Step S103, according to the weight coefficient of weight distribution in actual exploration modified result step S102, so as to obtain after amendment
Synthesis compressibility exponential distribution, and judge the dessert position of reservoir and crisp plasticity accordingly；
Step S104, analysis crack initiation extends to the probability of major fracture, before ensuring to only have a major fracture extension in a cluster
Put, zygotic induction stress determines the upper limit of cluster length, the lower limit of cluster length is determined with reference to Kong Zhaoxia；
Step S105, every section of number of clusters is determined according to crisp plasticity.
2. optimization method according to claim 1, it is characterised in that in the step S101, calculated by following formula
The geology dessert index of reservoir, sets up geology dessert index model：
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<mi>X</mi>
<mo>-</mo>
<mi>min</mi>
<mi>X</mi>
</mrow>
<mrow>
<mi>max</mi>
<mi>X</mi>
<mo>-</mo>
<mi>min</mi>
<mi>X</mi>
</mrow>
</mfrac>
</mrow>
In formula, SGFor geology dessert index, dimensionless；SiFor the normalized value of reservoir parameter；X is the occurrence of reservoir parameter；
MaxX and minX are respectively the minimum value and maximum of the reservoir parameter；wiFor the weight coefficient of reservoir parameter；N is the individual of parameter
Number.
3. optimization method according to claim 1, it is characterised in that in the step S101, based on every section of pressing crack construction
Fracture pressure curve, by following formula calculate reservoir engineering dessert index, set up engineering dessert index model：
<mrow>
<msub>
<mi>S</mi>
<mi>E</mi>
</msub>
<mo>=</mo>
<mn>1</mn>
<mo>-</mo>
<mfrac>
<msub>
<mi>S</mi>
<mrow>
<mi>T</mi>
<mi>o</mi>
<mi>T</mi>
<mi>C</mi>
<mi>B</mi>
<mi>D</mi>
</mrow>
</msub>
<msub>
<mi>S</mi>
<mrow>
<mi>T</mi>
<mi>o</mi>
<mi>T</mi>
<mi>C</mi>
<mi>C</mi>
<mi>D</mi>
</mrow>
</msub>
</mfrac>
</mrow>
In formula, SEFor engineering dessert index, dimensionless；ST0TCBDAnd ST0TCCDThe fracture pressure curve of respectively pressing crack construction is wrapped
The area of the fragility overlay area of network and the area of plasticity overlay area, unit is MPamin.
4. optimization method according to claim 1, it is characterised in that in the step S102, calculated by following formula
The synthesis compressibility index of reservoir, so as to set up comprehensive compressibility exponential model：
FI=(SG, SE)(w1, w2)T
In formula, FI is comprehensive compressibility index, dimensionless；SGFor geology dessert index, dimensionless；SEFor engineering dessert index, nothing
Dimension；w1And w2The respectively weight coefficient of geology dessert index and engineering dessert index.
5. optimization method according to claim 1, it is characterised in that in the step S103, the actual exploration result
For liquid/gas yield section result after pressure.
6. optimization method according to claim 1, it is characterised in that in the step S104, utilize probability distribution function
Analysis crack initiation extends to the probability of major fracture, wherein when probability distribution function value is more than or equal to 0.5, indicate fracture initiation/
Extend to major fracture.
7. optimization method according to claim 1, it is characterised in that in the step S104：
The induced stress produced according to given induced stress calculating plate calculating major fracture poor, Ran Houtong to correct horizontal stress
Cross following formula and calculate corresponding formation fracture pressure：
Pf=2 σmin-Δσh-Pi+T
In formula, PfFor formation fracture pressure, unit is MPa；σminFor minimum horizontal principal stress, unit is MPa；ΔσhFor two to water
Horizontal stress is poor, and unit is MPa；PiFor strata pressure, unit is MPa；T is tensile strength, and unit is MPa；
Wherein, the upper limit of cluster length will make the bottom pressure that the formation fracture pressure is more than at the horizontal wellbore of this cluster of correspondence, with
Ensure only one major fracture extension in cluster.
8. optimization method according to claim 1, it is characterised in that in the step S104, the lower limit of cluster length to make by
The operation pressure of Kong Zhaoxia influence is less than well head pressure limiting, to ensure pressing crack construction normal operation.
9. optimization method according to claim 1, it is characterised in that in the step S105, if reservoir is fragility reservoir,
Every section of number of clusters is first 4 to 6 clusters, is then gradually lifted to 8 to 10 clusters.
10. optimization method according to claim 1, it is characterised in that in the step S105, if reservoir stores up for plasticity
Layer, every section of number of clusters is 1 to 2 cluster or 3 to 4 clusters.
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