CN109635321A - A low stress difference vertical fracture fracturing sand amount calculation method, device and application - Google Patents
A low stress difference vertical fracture fracturing sand amount calculation method, device and application Download PDFInfo
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Abstract
本发明公开了一种低应力差垂直裂缝压裂加砂量计算方法、装置及应用，一种低应力差垂直裂缝压裂加砂量计算方法，包括：获取或计算裂缝损失程度；计算加砂量；所述加砂量=（2×设定裂缝半长×设定裂缝高度×裂缝宽度）/（1‑所述裂缝损失程度）；所述低应力为小于4Mpa的应力。以解决在油井压裂过程中，由于分支缝的存在，按照原有的双翼对称单一裂缝设计方法，裂缝长度达不到设计要求的问题。
The invention discloses a method, device and application for calculating the amount of sand added for vertical fracture fracturing with low stress difference. The amount of sand added=(2×set crack half length×set crack height×crack width)/(1-the degree of crack loss); the low stress is the stress less than 4Mpa. In order to solve the problem that in the process of oil well fracturing, due to the existence of branch fractures, according to the original double-wing symmetrical single fracture design method, the fracture length cannot meet the design requirements.
Description
Technical field
The present invention relates to petroleum production engineering field, a kind of specifically low stress difference vertical fracture fracturing sand feeding amount calculating side
Method, device and application.
Background technique
In pressure break scale design, split at present using the two dimension that symmetrical single fracture extension simulation mature both at home and abroad uses
Seam extends model, and according to bilateral symmetry, vertically single seam carries out pressure break scale design and sand feeding amount designs.But oil is steeped to dragon and tiger
The previous Fracturing Monitoring result in field is analyzed, its fracture pattern complexity is found, from 6 mouthfuls of wells, 17 layer micro-seismic monitoring results
It sees, with the presence of 12 layer branch seams, it is 70.6% that ratio, which accounts for, and crack is the complex fracture of non-bilateral symmetry.Monitoring result
Show the presence stitched due to branch, by the single symmetrical double-vane fracture design method of plane, design requirement is not achieved in fracture length.
Summary of the invention
In view of this, the present invention provides a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method, device and application,
To solve during wellfracturing, since the presence of branch's seam is split according to the symmetrical single fracture design method of original double-vane
The problem of design requirement is not achieved in seam length.Reservoir rock mechanics parameter and primitive stress data are measured by laboratory experiment, and
Carry out logistics organizations, provide optimization method, realizes the purpose that reservoir is sufficiently transformed.
In a first aspect, the present invention provides a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method, comprising:
Obtain or calculate the crack extent of damage；
Calculate sand feeding amount；
The sand feeding amount=(2 × setting fracture half-length × setting fracture height × fracture width)/(loss of crack described in 1-
Degree)；
The low stress is the stress less than 4Mpa.
Preferably, the fracture width is the fracture width of hydraulic fracturing.
Preferably, the fracture width of the hydraulic fracturing is 0.005m.
Preferably, the crack extent of damage=(the setting practical fracture length of fracture length -)/setting fracture length.
Second aspect, the present invention provide a kind of low stress difference vertical fracture fracturing sand feeding device for calculating, comprising:
Memory and processor and storage on a memory and the computer program that can run on a processor, the calculating
Machine program is a kind of such as above-mentioned low stress difference vertical fracture fracturing sand feeding amount calculation method, when the processor executes described program
It performs the steps of
Calculate the crack extent of damage；
Sand feeding amount=(2 × setting fracture half-length × setting fracture height × fracture width)/(loses journey in crack described in 1-
Degree)；
The low stress is the stress less than 4Mpa.
The third aspect, the present invention provide a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method in wellfracturing
The application of journey, comprising:
Such as a kind of above-mentioned low stress difference vertical fracture fracturing sand feeding amount calculation method；Or
Such as a kind of above-mentioned low stress difference vertical fracture fracturing sand feeding device for calculating.
The present invention at least has the following beneficial effects:
The present invention provides a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method, device and application, establishes one kind
New low stress difference vertical fracture fracturing sand feeding calculation method realizes design crack matching degree, it is ensured that fracturing effect.
Detailed description of the invention
By the description below with reference to attached drawing to the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage is apparent, in the accompanying drawings:
Fig. 1 is the flow chart of the kind low stress difference vertical fracture fracturing sand feeding amount calculation method of the embodiment of the present invention；
Fig. 2 is different level stress in a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method of the embodiment of the present invention
Difference and crack extent of damage relation curve；
Fig. 3 is for without a kind of former pressure break of low stress difference vertical fracture fracturing sand feeding amount calculation method optimization of the present invention
Crack schematic diagram；
Fig. 4 is a kind of fracturing fracture signal of low stress difference vertical fracture fracturing sand feeding amount calculation method of the embodiment of the present invention
Figure.
Specific embodiment
Below based on embodiment, present invention is described, but it is worth noting that, the present invention is not limited to these realities
Apply example.It is detailed to describe some specific detail sections below in datail description of the invention.However, for not detailed
The present invention can also be understood completely in the part described to the greatest extent, those skilled in the art.
In addition, it should be understood by one skilled in the art that provided attached drawing simply to illustrate that the purpose of the present invention,
Feature and advantage, attached drawing are not to be actually drawn to scale.
Meanwhile unless the context clearly requires otherwise, "include", "comprise" etc. otherwise throughout the specification and claims
Similar word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, being " including but not limited to "
Meaning.
The present invention provides a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method, according to the body of pressure break vertical fracture
Product, calculates the dosage of proppant, and in particular to crack seam is long, crack seam is high, crack slit width, realizes pressure break oil-increasing technology.
Fig. 1 is a kind of flow chart of low stress difference vertical fracture fracturing sand feeding amount calculation method of the embodiment of the present invention.Such as
Shown in Fig. 1, a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method, comprising: step S101 obtains or calculate crack damage
Mistake degree；Step S102 calculates sand feeding amount；The sand feeding amount=(2 × setting fracture half-length × setting fracture height × crack is wide
Degree)/(the crack extent of damage described in 1-)；The low stress is the stress less than 4Mpa.
In Fig. 1, the fracture width is the fracture width of hydraulic fracturing.The fracture width of the hydraulic fracturing is
0.005m。
In Fig. 1, the crack extent of damage=(the setting practical fracture length of fracture length -)/setting fracture length.
Specifically, by Young's modulus, Poisson's ratio, the compression strength, tensile strength mechanics parameter of measurement reservoir rock,
And measure horizontal maximum principal stress, horizontal minimum principal stress and the vertical stress size of reservoir and direction, manufacturing artificial core are opened
Exhibition simulation reservoir hydrfracturing experiment, stitches long data according to measured practical crack is tested under different stress differences, with setting
Crack seam length compares, and determines the crack extent of damage under different stress differences, and draw the crack extent of damage and stress difference
Relation curve establishes the low stress difference vertical fracture sand feeding amount calculation method for considering the crack extent of damage, Optimum Fracturing scheme.
Crack is influenced to form complex fracture by stress difference, by the former single symmetrical double-vane fracture design method of plane into
Row design, pressure break scale cannot reach design requirement.For this purpose, considering the crack extent of damage, sand feeding amount calculation method is redefined.
Establish the low stress difference vertical fracture fracturing sand feeding amount calculation method for considering the crack extent of damage:
Sand feeding amount=(2 × setting fracture half-length × setting fracture height × fracture width)/(crack the 1- extent of damage).
Wherein, fracture half-length needs according to fracturing reform, sets fracture half-length；
Wherein, fracture height sets fracture height according to reservoir reconstruction needs and blocking property of interlayer；
Wherein, fracture width: hydraulically created fracture width is 0.005m.
Fig. 2 is different level stress in a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method of the embodiment of the present invention
Difference and crack extent of damage relation curve.As shown in Fig. 2, journey is lost in different stress differences measured by hydraulic fracturing experiments and crack
The curve of degree shows the oil field easy to form complex fracture and fracture extension damage small for horizontal maximum and minimum principal stress difference
Wound.
It is generally believed that stress-strain curve of rock it is non-linear be due to its stress after it is continuous damage caused by fine fisssure
The germinating and extension of seam cause, and are rationally effective with the mesomechanics property that the constitutive relation of elastic dam- age mechanics describes rock
's.According to Elastic Damage Theory, the elasticity modulus of unit is gradually decreased with the increase of damage, damage equation are as follows:
E=(1-D) E0；
In formula, E0, E be respectively damage front and back elasticity modulus；Initial elastic modulus；D is damage variable.
When the tensile stress of unit reaches uniaxial tensile strength ft0, i.e. σ3≤-ft0(RFPA is positive with compression), damage variable
It indicates are as follows:
Wherein, λ=ftr/ft0；εt0=η εtu。
In formula, λ is residual strength coefficient, by remaining tensile strength ftrIt determines；εt0Drawing when elastic limit is reached for deformation
Stretching strain；εtuFor limit tensile strain, represent at this time unit oneself lose tensile capacity；η is ultimate tensile strength coefficient.
Under multi-axis stress state, unit principal strain could possibly be higher than strain stresst0It needs to calculate equivalent principal strain at this time:
In formula, ε1、ε2、ε3It is three principal strains；<>is computational operator, meaning are as follows:
Damage variable at this time are as follows:
Above-mentioned analog result shows that simulation of rock fracture surface is not straight extension, either from microcosmic crystal or macroscopic view
It is observed on Fracture-scale, rock fracture all presents apparent bending, roughening, that is, shows type charcteristics.
In order to quantify crack parting degree, the concept of the crack extent of damage is introduced, is simulated under the poor 2~7MPa of horizontal stress
The crack extent of damage, and draw relation curve.
The crack extent of damage=(the setting practical fracture length of fracture length -)/setting fracture length.
Fig. 3 is for without a kind of former pressure break of low stress difference vertical fracture fracturing sand feeding amount calculation method optimization of the present invention
Crack schematic diagram.Fig. 4 is a kind of fracturing fracture of low stress difference vertical fracture fracturing sand feeding amount calculation method of the embodiment of the present invention
Schematic diagram.As shown in Figure 3 and Figure 4, using new sand feeding amount calculation method, sand feeding amount improves 1/ (crack the 1- extent of damage) times,
Pressure break scale is increased, and the volume of reservoir reconstruction is significantly increased, and has been reached pressure break setting seam length, has been improved the effect of measures to reform
Fruit.
Meanwhile the present invention provides a kind of low stress difference vertical fracture fracturing sand feeding device for calculating, comprising: memory and place
The computer program managing device and storage on a memory and can running on a processor, the computer program are such as above-mentioned one kind
Low stress difference vertical fracture fracturing sand feeding amount calculation method, the processor perform the steps of step when executing described program
S101 obtains or calculates the crack extent of damage；Step S102 calculates sand feeding amount；The sand feeding amount=(2 × setting fracture half-length ×
Set fracture height × fracture width)/(the crack extent of damage described in 1-)；The low stress is the stress less than 4Mpa.
In addition, the present invention proposes a kind of low stress difference vertical fracture fracturing sand feeding amount calculation method in wellfracturing process
Using, comprising: a kind of such as above-mentioned low stress difference vertical fracture fracturing sand feeding amount calculation method；Or as a kind of above-mentioned low stress difference is vertical
Straight crack fracturing sand feeding device for calculating.
The present invention is in the 9th oil recovery factory low stress difference vertical fracture oil field of Daqing oil field, and 153 mouthfuls of wells of field test, average altogether
Single layer sand feeding amount is increased to 14m3 by 9m3, and accumulation increases 6.3792 × 104t of oil.Carry out 39 mouthfuls of Pilot trial in Longhupao oilfield
Well, it is 0.91t/d.m that initial stage, which increases oily intensity, 0.29t/d.m higher than original method optimization well, and aqueous stabilization has 85.0% or so
Average individual well increases oil 216t more in the effect phase, adds up to increase oil 16692t more, and increment input-output ratio is 1:4.4, counts 12 mouthfuls of wells 39
A layer stitches long coincidence rate and reaches 82.1%, compares with original method, improves 61.5 percentage points.Qi Jiabei field scale is carried out
59 mouthfuls of wells are tested, it is 0.7t/d.m that initial stage, which increases oily intensity,, identical production 540 day Shi Ping 0.2t/d.m higher than original method optimization well
Equal individual well increases oil 69t more, adds up to increase oil 4071t, increment input-output ratio is 1:4.3 more.
Embodiment described above is only to express embodiments of the present invention, and the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that those skilled in the art,
Under the premise of not departing from present inventive concept, several deformations, same replacement can also be made, improved etc., these belong to the present invention
Protection scope.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (6)
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Cited By (2)
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| CN110080739A (en) * | 2019-05-08 | 2019-08-02 | 中国石油天然气股份有限公司 | A Judgment Method for On-Site Construction of Multi-branch Fracturing in Vertical Wells |
| CN112031732A (en) * | 2020-09-17 | 2020-12-04 | 中国石油天然气股份有限公司 | A new "fiber + proppant" vertical well multi-lateral fracture fracturing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080739A (en) * | 2019-05-08 | 2019-08-02 | 中国石油天然气股份有限公司 | A Judgment Method for On-Site Construction of Multi-branch Fracturing in Vertical Wells |
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| CN112031732A (en) * | 2020-09-17 | 2020-12-04 | 中国石油天然气股份有限公司 | A new "fiber + proppant" vertical well multi-lateral fracture fracturing method |
| CN112031732B (en) * | 2020-09-17 | 2022-07-22 | 中国石油天然气股份有限公司 | Novel fiber and proppant vertical well multi-branch crack fracturing method |
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