CN109145497A - A kind of calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount - Google Patents
A kind of calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount Download PDFInfo
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Abstract
The present invention provides a kind of calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount, the method comprising the steps of: (1) designing Equivalent Calculation Model, the single hop complexity seam net that horizontal well is formed after hydraulic fracturing is simplified to by single macrocrack and the substrate composed Equivalent Calculation Model of high permeability；The macrocrack runs through high permeability matrix from centre；(2) physical parameter of Equivalent Calculation Model is determined；(3) the blocking agent fill volume of single hop complexity seam net is calculated；(4) calculating of the total dosage of blocking agent.Calculation method of the present invention can realize the quantitative calculating to required plug agent amount, the filling effect of blocking agent leak-off and blocking agent fracture is fully considered, it is accurate and simple and easy, cost caused by avoiding blocking agent large dosage is general from injecting is excessively high, it ensures that effective closure of blocking agent fracture, improves oil well oil-producing quality.
Description
Technical field
The present invention relates to a kind of calculation methods of hydraulic fracture near horizontal wellbore water blockoff plug agent amount, belong in oilfield development process
Yield-increasing technology field.
Background technique
The crack chemical water shutoff of low-permeability oil deposit horizontal well is mainly to have used for reference the method and experience of loose sand reservoir water blockoff.
It is still at present gel-type blocking agent and grain-type water shutoff agent using more water plugging of horizontal well agent, the design of blocking agent injection technology is also warp
It tests calculating and obtains.Implemented by mining site in recent years, blocking agent injection technology design aspect achieves some achievements and experience, but total
Body is still bad to stress results.
Currently, oil field generallys use empirical method and is counted in the plug agent amount design for carrying out crack water blockoff both at home and abroad
It calculates.Such as, 1/2~1 times of dosage of oil well daily fluid production rate can be used, or the crevice volume that according to hydraulic fracturing when is designed carries out
The dosage of blocking agent is calculated, but does not consider post-fracturing fracture parameters problem.The blocking agent design theory proposed in the prior art
Calculation method is all based on artificial fracturing or intrinsic fracture straight well and designs, and for horizontal well crack water blockoff plug agent amount
Optimization design research report is less.Polytechnics of New Mexico of U.S. professor Seright establishes stifled for hydraulically created fracture
Crack water blockoff plug agent amount designed by the scholars such as the 11 step processes, and Russia Zha Haluofu of the design of water blocking agent dosage optimization
Calculation method has obtained relatively broad approval.But do not fully consider that blocking agent is filtered in the method for professor's Seright design
It becomes estranged the filling effect of fracture, the plug agent amount calculated is less than normal, causes water logging crack that cannot block completely；Zha Haluofu
The main applicable object of method be intrinsic fracture development carbonate reservoir, rather than man-made fracture reservoir.Chinese patent text
It offers CN102071903A and discloses a kind of method for calculating dosage of horizontal well chemical water shutoff agent, this method is selected according to water enchroachment (invasion) type
Rectangular body Model or column lack model and calculate water shutoff agent dosage；The water enchroachment (invasion) type includes that edge water drive, bottom water driving or edge-bottom water are total
With driving.Inventive method calculating water shutoff agent dosage is quick and easy, strong operability, but this method does not consider the influence in crack,
It is primarily adapted for use in the heterogeneous reservoir water plugging of horizontal well without artificial fracturing.
Therefore, in order to establish the optimization calculating side of plug agent amount suitable for horizontal well artificial fracturing crack water blockoff a kind of
Method proposes the present invention.
Summary of the invention
In view of the deficienciess of the prior art, the present invention provides a kind of calculating of hydraulic fracture near horizontal wellbore water blockoff plug agent amount
Method；The quantitative calculating to required plug agent amount can be achieved during horizontal well water logging crack chemical water shutoff, fully consider
The filling effect of blocking agent leak-off and blocking agent fracture, it is accurate and simple and easy, it avoids caused by the general injection of blocking agent large dosage
Cost is excessively high, ensures that effective closure of blocking agent fracture, improves oil well oil-producing quality.
Term explanation:
Single hop complexity stitches net: horizontal well forms complicated seam net in many places after being segmented artificial fracturing, answers at therein one
Miscellaneous seam net is known as single hop complexity seam net (as shown in Figure 1)；The single hop complexity seam net is three-dimensional space stereochemical structure, and single hop is complicated
The major fracture of seam net is centered on horizontal wellbore in symmetrical up and down, branch's seam, the microcrack of the single hop complexity seam net
Equal part is distributed in the upper and lower part of horizontal wellbore.
The half width w of high permeability matrixm: refer to the width of the high permeability matrix in macrocrack side.
Blocking agent enters the half width w of high permeability matrixgel: refer to that blocking agent enters the half of the width of high permeability matrix.
Fracturing fluid is efficiently injected into volume V in fracturing processs: refer to fracturing fluid injection rate and returns the difference of discharge capacity.
Technical scheme is as follows:
A kind of calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount, comprising steps of
(1) Equivalent Calculation Model is designed
The single hop complexity seam net that horizontal well is formed after hydraulic fracturing is simplified to by single macrocrack and high permeability
Substrate composed Equivalent Calculation Model；The macrocrack runs through high permeability matrix from centre；
Wherein, the major fracture in the single hop complexity formed after hydraulic fracturing seam net is simplified to single macrocrack, by water
It forces branch's seam, the microcrack etc. formed after splitting and is simplified to high permeability matrix；
(2) physical parameter of Equivalent Calculation Model is determined
Determine the long L of the seam of macrocrack in Equivalent Calculation Modelf, slit width wfWith the high h of seamfAnd the length of high permeability matrix
Spend Lm, half width wmWith height hm；
(3) the blocking agent fill volume of single hop complexity seam net is calculated
Calculate the blocking agent fill volume V ' in single macrocrackgelAnd the blocking agent fill volume of high permeability Medium Culture
V″gel；The blocking agent fill volume of single hop complexity seam net is V 'gelWith V "gelThe sum of；
(4) calculating of the total dosage of blocking agent
The total dosage V of blocking agent needed for blocking n single hop complexity seam netgelFor the blocking agent fill volume in single macrocrack
V 'gelWith the blocking agent fill volume V " of high permeability Medium CulturegelThe sum of n times, wherein n be more than or equal to 1, it may be assumed that
Vgel=n (V 'gel+V″gel) (i)。
It is preferred according to the present invention, the long L of seam of macrocrack described in step (2)f, slit width wfIt can be according in fracturing process
Micro-seismic monitoring data be calculated, or be calculated according to PKN or KGD model；The high h of the seam of macrocrackfIt is horizontal
Total effective thickness of well upper and lower part oil reservoir；The half width w of high permeability matrixmIt is the major fracture of adjacent single hop complexity seam net
Between distance half；The height h of high permeability matrixmH high equal to the seam of macrocrackf；The length L of high permeability matrixmDeng
In the long L of the seam of macrocrackf。
According to the present invention, the microseismic are as follows: the strata pressure in hydraulic fracturing process, near horizontal wellbore
It has been more than the tensile strength of rock itself, has caused formation rock rupture, generates crack to the extension of stratum depths, while is broken in rock
Microseism can be generated during splitting with fracture extension, using in advance in well or the special geophone of ground Reasonable Arrangement connects
The seismic signal generated in whole process is received to be calculated so that the focus generated in fracture expansion process is positioned
A kind of novel geophysical method of the morphological parameters such as fracture length, height, azimuth.Above-mentioned microseismic is by existing
Technology carries out.The method for calculating fracture parameters according to PKN or KGD model is the hydraulic fracturing field prior art.
It is preferred according to the present invention, the blocking agent fill volume V ' in step (3), in the single macrocrackgelCalculating
Method are as follows: the blocking agent fill volume V ' in single macrocrackgel=macrocrack volume Vf× macrocrack porosity, it may be assumed that
V 'gel=Vf·(1-φsand)=wf·hf·Lf·(1-φsand) (ii)
Wherein, φsandFor macrocrack inner support agent laying concentration mass percent, i.e. pressure break when fracturing fluid used in
Proppant mass concentration.
It is preferred according to the present invention, in step (3), the blocking agent fill volume V " of the high permeability Medium CulturegelCalculating
Method are as follows: the blocking agent fill volume V " of high permeability Medium Culturegel=high permeability matrix volume Vm× high permeability matrix pores
Spend φm× block width ratio, it may be assumed that
Wherein, wgelEnter the half width of high permeability matrix for blocking agent；
The closure width ratio are as follows: blocking agent enters the half width of high permeability matrix and the ratio of high permeability matrix half width
Value, i.e. wgel/wm。
Preferably, the high permeability matrix porosity φmCalculation method are as follows: high permeability matrix porosity φmIt is equal to
The total pore volume V of high permeability matrixpWith the volume V of high permeability matrixmThe ratio between, that is,
φm=Vp/Vm(iv)；
Wherein, VpCalculation method are as follows:
According to field experience, the filter loss of fracturing fluid is about 40%~60% in low-permeability sandstone oil reservoir fracturing process, that is, is entered
The volume of ground fracturing fluid is probably 2 times of formed Feng Wangzhong branch seam, microcrack in equal volume.
That is, the total pore volume V of high permeability matrixpVolume V is efficiently injected into equal to fracturing fluid in fracturing processsTwo
/ mono- with pressure break before low-permeability matrix pore volume Vp'The sum of；The pore volume V of low-permeability matrix before pressure breakp'Deng
In the primary porosity φ ' of low-permeability matrixmMultiplied by the volume V of low-permeability matrixm, the volume of the low-permeability matrix
It is identical with the volume of high permeability matrix, it may be assumed that
Vp=Vs/2+Vp'=Vs/2+φ'm·Vm (v)。
For the present invention when calculating plug agent amount, the single hop complexity that horizontal well is formed after hydraulic fracturing stitches net (see Fig. 1)
It is simplified to by single macrocrack and the substrate composed Equivalent Calculation Model of high permeability (see Fig. 2), wherein after hydraulic fracturing
Major fracture 1 in the single hop complexity seam net of formation is simplified to single macrocrack 5, and the branch formed after hydraulic fracturing is stitched, is micro-
Crack 3 etc. is simplified to high permeability matrix 6, and macrocrack 5 runs through high permeability matrix 6 from centre.Pass through computation model crack
Volume to calculate the dosage of blocking agent；The Equivalent Calculation Model that the present invention designs can be good at reflection after hydraulic fracturing
The crack of formation；It calculates plug agent amount using the above-mentioned model of the present invention, has fully considered the filling effect of blocking agent fracture, i.e., it is stifled
Agent can not only be filled up completely major fracture, also want pack portion or whole high permeability matrix, it is contemplated that the leak-off of blocking agent
Property, the plug agent amount for enabling the method for the present invention to be calculated realizes effective closure of fracture with lesser cost.
It technical characterstic of the invention and has the beneficial effect that:
(1) the single hop complexity seam net that horizontal well is formed after hydraulic fracturing is simplified to by single macroscopic view in the method for the present invention
Crack and the substrate composed Equivalent Calculation Model of high permeability, wherein by the master in the single hop complexity formed after hydraulic fracturing seam net
Crack is simplified to single macrocrack, and branch's seam, microcrack for being formed after hydraulic fracturing etc. are simplified to high permeability matrix, macro
It sees crack and runs through high permeability matrix from centre；Above-mentioned model can be good at reflecting the crack formed after hydraulic fracturing, right
Complexity seam net has typical representative.
(2) in the method for the present invention, when designing plug agent amount, not only guarantee that blocking agent can be filled up completely macrocrack and lead
Crack is also wanted pack portion or whole high permeability matrix, that is, branch's seam, microcrack etc., is blocked needed for single hydraulic fracture
Blocking agent volume be in macrocrack can fill volume and high permeability Medium Culture can the sum of fill volume, compensate for live general stifled
The deficiency that blocking agent fills water logging major fracture space and ignores branch's seam and fine fisssure gap space is required nothing more than during water, it is contemplated that stifled
The leak-off of agent；Both it will not inject excessive blocking agent to reach and cause cost excessively high, and also ensure that the purpose of water plugging effect.
(3) calculation method of the present invention is accurate and simple and easy, and the plug agent amount being calculated using the method for the present invention can be with
Good fracture is blocked；The moisture content of adopted liquid can be significantly reduced after, moisture content can reduce by 47.54%,
And oil production can be dramatically increased, the quality of oil-producing is significantly improved.With the general plug agent amount calculation method phase of field application
Than method of the invention is more accurate and simple and easy, can achieve good crack plugging effect while reducing cost, mentions
High yield oil quality.
Detailed description of the invention
Fig. 1 is the schematic diagram of the single hop complexity seam net formed after hydraulic fracturing；
Wherein, 1 is major fracture, and 2 be low-permeability matrix, and 3 be branch's seam and microcrack, and 4 be horizontal well.
Fig. 2 is the schematic diagram of Equivalent Calculation Model of the present invention；
Wherein, 5 be macrocrack, and 6 be high permeability matrix；wmFor high permeability matrix half width, wfFor macrocrack
Slit width, L are the long L of seam of macrocrackf, high permeability matrix length Lm, h is the high h of seam of macrocrackf, high permeability matrix
Height hm。
Specific embodiment
Below by specific embodiment, the present invention will be further described, but not limited to this.
Raw materials used in embodiment is conventional raw material, commercially available acquisition；The method is routine unless otherwise specified
Method, the prior art.
Changqing oilfields XX well is in 420 block of the operation area Xin Zhai Wu, and oil reservoir construction is gentle at this, and oil reservoir spread is stablized, water
Interlayer connectivity is good between horizontal well and surrounding water injection well, and water drive reserves controlling extent is high.Simultaneously 5 sections of pressure break of the well cascode hole, water detection
Oil well daily fluid production rate 13.71m before testing3, composite water cut 81.06%.With compared with the other wells of block, Changqing oilfields XX well
Water exit position understands that water outlet crack point is more clear, and the hydraulic fracture of horizontal wellbore section toe is the main EXIT POINT of the well, therefore
It should be blocked.
Embodiment 1
A kind of calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount calculates and blocks Changqing oilfields XX well horizontal wellbore
Plug agent amount is blocked needed for the hydraulic fracture of section toe, comprising steps of
(1) Equivalent Calculation Model is designed
The single hop complexity seam net that horizontal well is formed after hydraulic fracturing is simplified to by single macrocrack 5 and high permeability
The Equivalent Calculation Model that matrix 6 forms；The macrocrack 5 runs through high permeability matrix 6 from centre；Wherein, by hydraulic fracturing
The major fracture 1 in single hop complexity seam net formed afterwards is simplified to single macrocrack 5, the branch formed after hydraulic fracturing is stitched,
Microcrack 3 etc. is simplified to high permeability matrix 6；
(2) physical parameter of Equivalent Calculation Model is determined
PKN, KGD model for being primarily based on classics, which calculate the parameter of macrocrack 5 using iterative method, (uses PKN
Calculating fracture parameters with KGD model is the pressing crack construction prior art, can refer to " petroleum production engineering principle and design (Zhang Qizhu in detail
Compile) " chapter 6 hydraulic fracturing technology).Pressing crack construction discharge capacity (the fracturing fluid volume injected in the unit time into stratum) q0For
2.0m3/min；Elastic modulus of rock G is 1.52 × 104MPa；Rock Poisson Ratio Using ν is 0.291；Fracturing fluid viscosity μ is
93.2mPas (main component of fracturing fluid is guanidine that glue and organic borate cross-linker)；Upper horizontal well and bottom oil layer always have
Imitate thickness hfFor 29.1m.Parameter according to the macrocrack 5 of PKN and KGD model calculating is as shown in table 1.
The parameter for the macrocrack 5 that table 1 is calculated according to classical model
| Fracture parameters | Evaluation |
| Stitch high hf, m, | 29.1 |
| Slit width wf(PKN), mm | 9.38 |
| Slit width wf(KGD), mm | 7.01 |
| Stitch long Lf(PKN), m | 82.2 |
| Stitch long Lf(KGD), m | 57.4 |
Since PKN model does not account for the leak-off problem of fracturing fluid, thus refer to the macrocrack 5 of KGD model slit width and
Long calculated result is stitched, that is, takes the slit width w of macrocrack 5f7.01mm stitches long Lf57.4m；The high h of the seam of macrocrack 5fThat is horizontal well
Total effective thickness of upper and lower part oil reservoir is 29.1m.
When blocking target crack, design blocks the spacing that range is adjacent major fracture, then the width of high permeability matrix 6
2wmFor 25.7m；The width of high permeability matrix 6 is the spacing in adjacent single hop complexity seam net between adjacent major fracture herein.It is high
The length L of permeability matrix 6mWith long identical, the height h of high permeability matrix 6 of the seam of macrocrack 5mWith oil reservoir overall thickness hfPhase
Together.
(3) the blocking agent fill volume of single hop complexity seam net is calculated
A, the blocking agent fill volume V ' in single macrocrack 5gelCalculating (fracturing fluid when Changqing oilfields XX well pressure break
Average sand ratio is 35.2wt%, i.e. the laying concentration mass percent of macrocrack inner support agent):
V′gel=Vf·(1-φsand)=wf·hf·Lf·(1-φsand)=0.07 × 57.4 × 29.1 × (1-0.352)
=75.77m3
B, the blocking agent fill volume V " in high permeability matrix 6gelCalculating:
Vm=2wm·hm·Lm=25.7 × 29.1 × 28.7 ≈ 2.15 × 104m3
Design the total pore volume V of high permeability matrix 6pVolume V is efficiently injected into equal to fracturing fluid in fracturing processs(i.e.
Fracturing fluid injection rate and the difference for returning discharge capacity, the parameter that when pressing crack construction provides are 582m3) half and pressure break before hyposmosis
The pore volume V of rate matrix 2p'The sum of, original place layer matrix, that is, low-permeability matrix 2 porosity φ 'mIt is 7.16%, then it is hypertonic
The total pore size volume of saturating rate matrix 6 are as follows:
Vp=Vs/2+Vp'=Vs/2+φ'm·Vm=582 2+0.0716 × 2.15 × 10 ÷4=1830.4m3
When calculating plug agent amount, it is desirable that blocking agent can be filled up completely macrocrack 5, also want pack portion high permeability matrix
6.According to laboratory test observed result and field experience, migration of the blocking agent from macrocrack 5 into high permeability matrix 6 is designed
Distance (entering the half width of high permeability matrix under physical condition for filling branch seam and microcrack, i.e. blocking agent) wgelIt is hypertonic
The half width w of saturating rate matrix 6m1/5, i.e. 2wgelValue about 5m.
Calculate 5 periphery w of macrocrackgelThe average pore φ of high permeability matrix 6 in distancemAre as follows:
φm=Vp/Vm=1830.4 ÷ (2.15 × 104)=0.0851
Blocking agent fill volume V " in high permeability matrix 6gelAre as follows:
(4) calculating of the total dosage of blocking agent
Vgel=V 'gel+V″gel=75.77+355.96 ≈ 432m3
Application examples
The hydraulic fracture of Changqing oilfields XX well horizontal wellbore section toe is carried out by the dosage of the calculated blocking agent of embodiment 1
Crack blocks.
In view of blocking agent injection rate is larger, therefore two round of its point is injected, the injection design of Changqing oilfields XX well section plug blocking agent
As shown in table 2.
2 Changqing oilfields XX well blocking agent injection mode of table
In table 2 polymer solution used be polyacrylamide that mass concentration is 3500mg/L (relative molecular weight 18,000,000,
Degree of hydrolysis 20%) aqueous solution；Polymer gel/fiber is the mixture of polymer gel and fiber；Wherein, polymer gel master
It to include the polyacrylamide (relative molecular weight 18,000,000, degree of hydrolysis 20%) and 0.5wt% organic chrome cross linker of 3000mg/L；
Fiber is polypropene staple, pencil monofilament, specification 3-12mm；The concentration 1.0wt% of fiber in polymer gel/fiber.
The effect of preposed attributives polymer solution is the highly mineralized formation brines driven away in crack, is prevented solidifying to polymer
Glue/fiber blocking agent damages, while can adjust migration profile when polymer gel/fiber blocking agent injection, allows to
Uniform pack fracture spaces；The effect for replacing slug polymer solution is to coagulate the polymer in pit shaft and at preforation tunnel
Glue/fiber blocking agent displacement enters stratum, prevents from blocking pit shaft and eyelet.
According to 1 plug agent amount calculated result of embodiment and the blocking agent injection mode of the application example, to Changqing oilfields XX well
After construction, target crack has effectively been blocked.Oil well daily fluid production rate is by 13.71m after construction3It is down to 11.50m3, composite water cut
Be down to 42.52% by 81.06%, day oil-producing increase 4.01m3.It can be seen from the above, calculated stifled using method of the invention
The dosage of agent can effectively fracture blocked, and it is obvious to the mass action effect of oil productivity and oil-producing.
Claims (5)
1. a kind of calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount, comprising steps of
(1) Equivalent Calculation Model is designed
The single hop complexity seam net that horizontal well is formed after hydraulic fracturing is simplified to by single macrocrack and high permeability matrix
The Equivalent Calculation Model of composition；The macrocrack runs through high permeability matrix from centre；
Wherein, the major fracture in the single hop complexity formed after hydraulic fracturing seam net is simplified to single macrocrack, by waterpower pressure
Branch's seam, microcrack for being formed after splitting etc. are simplified to high permeability matrix；
(2) physical parameter of Equivalent Calculation Model is determined
Determine the long L of the seam of macrocrack in Equivalent Calculation Modelf, slit width wfWith the high h of seamfAnd the length L of high permeability matrixm、
Half width wmWith height hm；
(3) the blocking agent fill volume of single hop complexity seam net is calculated
Calculate the blocking agent fill volume V ' in single macrocrackgelAnd the blocking agent fill volume V " of high permeability Medium Culturegel；
The blocking agent fill volume of single hop complexity seam net is V 'gelWith V "gelThe sum of；
(4) calculating of the total dosage of blocking agent
The total dosage V of blocking agent needed for blocking n single hop complexity seam netgelFor the blocking agent fill volume V ' in single macrocrackgel
With the blocking agent fill volume V " of high permeability Medium CulturegelThe sum of n times, wherein n be more than or equal to 1, it may be assumed that
Vgel=n (V 'gel+V″gel) (i)。
2. the calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount according to claim 1, which is characterized in that step
(2) the long L of the seam of macrocrack described inf, slit width wfIt can be calculated according to the micro-seismic monitoring data in fracturing process, or
It is calculated according to PKN or KGD model；The high h of the seam of macrocrackfIt is total effective thickness of upper horizontal well and bottom oil layer；
The half width w of high permeability matrixmIt is the half of the distance between the major fracture that adjacent single hop complexity seam is netted；High permeability matrix
Height hmH high equal to the seam of macrocrackf；The length L of high permeability matrixmL long equal to the seam of macrocrackf。
3. the calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount according to claim 1, which is characterized in that step
(3) the blocking agent fill volume V ' in, in the single macrocrackgelCalculation method are as follows: the blocking agent in single macrocrack is filled
Fill out volume V 'gel=macrocrack volume Vf× macrocrack porosity, it may be assumed that
V′gel=Vf·(1-φsand)=wf·hf·Lf·(1-φsand) (ii)
Wherein, φsandFor macrocrack inner support agent laying concentration mass percent, i.e. pressure break when fracturing fluid used in branch
Support the mass concentration of agent.
4. the calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount according to claim 1, which is characterized in that step
(3) in, the blocking agent fill volume V " of the high permeability Medium CulturegelCalculation method are as follows: the blocking agent of high permeability Medium Culture is filled
Fill out volume V "gel=high permeability matrix volume Vm× high permeability matrix porosity φm× block width ratio, it may be assumed that
Wherein, wgelEnter the half width of high permeability matrix for blocking agent；
The closure width ratio are as follows: blocking agent enters the half width of high permeability matrix and the ratio of high permeability matrix half width,
That is wgel/wm。
5. the calculation method of hydraulic fracture near horizontal wellbore water blockoff plug agent amount according to claim 4, which is characterized in that the height
Permeability matrix porosity φmCalculation method are as follows: high permeability matrix porosity φmHole equal to high permeability matrix is total
Volume VpWith the volume V of high permeability matrixmThe ratio between, that is,
φm=Vp/Vm(iv)；
Wherein, VpCalculation method are as follows:
The total pore volume V of high permeability matrixpVolume V is efficiently injected into equal to fracturing fluid in fracturing processsHalf with
The pore volume V of low-permeability matrix before pressure breakp'The sum of；The pore volume V of low-permeability matrix before pressure breakp'Equal to hyposmosis
The primary porosity φ ' of rate matrixmMultiplied by the volume V of low-permeability matrixm, the volume and Thief zone of the low-permeability matrix
The volume of rate matrix is identical, it may be assumed that
Vp=Vs/2+Vp'=Vs/2+φ'm·Vm (v)。
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| CN111141616A (en) * | 2020-01-08 | 2020-05-12 | 东北石油大学 | Experimental device and experimental method for simulating deformation of seam-net modified stratum casing |
| CN111236925A (en) * | 2020-01-19 | 2020-06-05 | 中国石油大学(华东) | Method for predicting drilling fluid leakage amount of fractured formation |
| US20200386081A1 (en) * | 2019-06-05 | 2020-12-10 | Southwest Petroleum University | Optimized design method for temporary blocking agent to promote uniform expansion of fractures produced by fracturing in horizontal wells |
| CN115618581A (en) * | 2022-09-28 | 2023-01-17 | 西南石油大学 | Multi-stage fractured horizontal well polymer gel selective water plugging design method |
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| CN111236925A (en) * | 2020-01-19 | 2020-06-05 | 中国石油大学(华东) | Method for predicting drilling fluid leakage amount of fractured formation |
| CN111236925B (en) * | 2020-01-19 | 2021-04-06 | 中国石油大学(华东) | Method for predicting drilling fluid leakage amount of fractured formation |
| CN115618581A (en) * | 2022-09-28 | 2023-01-17 | 西南石油大学 | Multi-stage fractured horizontal well polymer gel selective water plugging design method |
| CN115618581B (en) * | 2022-09-28 | 2023-08-29 | 西南石油大学 | Polymer gel selective water shutoff design method for multistage fracturing horizontal well |
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