CN106593400A - Directional well spacing method for volume fracturing of ultra-low permeability tight oil reservoir - Google Patents
Directional well spacing method for volume fracturing of ultra-low permeability tight oil reservoir Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention discloses a directional well spacing method for volume fracturing of an ultra-low permeability tight oil reservoir, which can exert the large-scale volume fracturing capability, greatly improve the initial yield of a single well and realize high proportion of oil-water wells; the method for optimizing the well pattern comprehensively applies oil reservoir engineering, numerical simulation, underground micro-seismic monitoring, mine field statistics and the like, fully considers different reservoir characteristics and transformation processes, avoids fractured flooding, and simultaneously meets the requirement of realizing long-term stable water injection and energy supplement, thereby realizing the purpose of improving the single-well yield and the development benefit of the ultra-low permeability compact oil reservoir. The invention can aim at complex geology such as longitudinal oiling layer combination development of the ultra-low permeability tight oil reservoir, large structural amplitude change on a plane and the like, has reasonable well arrangement method and can improve the development effect to the maximum extent.
Description
【Technical field】
The invention belongs to oil field development field, is related to a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure.
【Background technology】
As the oil reservoir quality employed is deteriorated year by year, Oil in Super-low Permeability compact oil reservoir progressively become oil field at home exploitation on produce and
The important of stable yields takes over one of area, is the well yield for improving such oil reservoir, and engineering specialists do a lot of work, and reservoir changes
The technology of making is obtained than larger breakthrough, and directional well fracturing technique develops into multistage multiple crack fracturing and volume fracturing by development fracturing,
Fractured horizontal well technology is innovated to volume fracturing by conventional stage pressure break, and current horizontal well/directional well+volume fracturing has become super
Hypotonic compact oil reservoir improves the important means of individual well initial production.Horizontal well+volume fracturing is primarily adapted for use in the upper oil reservoir phase in longitudinal direction
To single, in plane, Structural range is less, the preferable oil reservoir of oil reservoir seriality, and advantage is that well yield is high, has the disadvantage from current
From the point of view of the situation of on-site development test, under existing technological means, the management cost in horizontal well development later stage is higher.Directional well
+ volume fracturing is primarily adapted for use in longitudinal direction and oils to be laminated to close develops, the oil reservoir that Structural range is changed greatly in plane, in existing skill
Under art means, the management cost of directional well development late stage is less.
Two ways respectively has its applicable oil reservoir, can improve the initial stage well yield of Oil in Super-low Permeability compact oil reservoir, but how
Realize the stable yields of long period.From the point of view of literature survey, horizontal well+volume fracturing adopts spindle five-spot pattern substantially
Raising individual well initial production is solved, the target of long period stable yields is realized.Directional well volume fracturing is developed at present also in examination
Test the stage, test well pattern is also developed using more traditional five-spot pattern, anti-seven spot pattern and rhombic inverted nini-spot well pattern, from exploitation
From the point of view of the effect of test, generally after raising well yield, the effect of stable yields is poor, the well yield after 6～8 months of general stable yields
With regard to rapid decrease；Although rhombic inverted nini-spot well pattern recovery percent of reserves and rate of oil production are apparently higher than other three kinds of well patterns, mining site system
Meter shows that volume fracturing orientation wellblock rhombic inverted nini-spot well pattern is main to the easy water breakthrough of well.As the expense of directional well volume fracturing is than normal
Rule pressure break it is costly, using traditional directional well well-arranging procedure oil-water well ratio is relatively low, stable yields effect is poor, it is difficult to obtain compared with
Good development benefit, it is also difficult to farthest play the advantage of directional well volume fracturing.
【The content of the invention】
Present invention aims to volume fracturing directional well well-arranging procedure effectively supplements the problem that energy is present at present,
The present invention proposes a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing orientation that can be reduced Fractured water logging, improve oil-water well ratio
Well well-arranging procedure.
To reach above-mentioned purpose, the present invention is employed the following technical solutions and is achieved：
The present invention taken into full account the multiple zone composite stack that Oil in Super-low Permeability compact oil reservoir presents, structural relief change greatly,
The features such as reservoir properties are poor, anisotropism is strong, intrinsic fracture is developed, it is proposed that a kind of water injection well wire water filling, producing well are in well
Net center assumes diamond in shape and is distributed the volume fracturing directional well well-arranging procedure (accompanying drawing 1) for recovering the oil.
The method and basic principle of the well-arranging procedure optimization design be：One is the energy that can play extensive volume fracturing
Power, increases substantially individual well initial production；Two is geology and process integration, well net optimization take into full account different reservoir feature and
Reforming technology, it is to avoid Fractured water logging, while meeting the requirement for realizing that long term stable production water filling supplements energy；Three is integrated application oil
The methods such as engineering, numerical simulation, down-hole micro-seismic monitoring, mining site statistics are hidden, while considering technical specification and economic indicator.Including
Following steps：
1) carry out integrated geological interpretation first, preferred orientation Jing Jingwangbushuqu is carried out reservoir classification and evaluation, determines the main force
Contribution interval.
1. Dominated Factors research, comprehensive geology and reservoir engineering are enriched with by sedimentary micro, Diagenetic Facies and high yield in plane
Method, carries out reservoir classification and evaluation, determines directional well well net deployment region.
2. Production development is combined on longitudinal direction, main force's contribution interval is found using composite index law.
2) well arranges the optimization in direction
1. according to imaging logging, the test result of down-hole microseism, determine biggest principal stress direction.
2. directional well well pattern array pitch direction is determined according to biggest principal stress direction.
3) optimization of oil-water well fracture length：
In the well pattern, water injection well is changed to wire water filling by past spot flooding, on the one hand increases Water-drive control scope；
On the other hand reduce water injection pressure, it is to avoid the unlatching of dynamic crack in waterflooding extraction, and due to water injection well man-made fracture band
Width reduces array pitch, is more beneficial for setting up effective displacement pressure system.
Reservoir engineering method comprehensive first carries out oil-water well fracture length Optimum Matching Numerical-Mode for different type reservoir
Intend, determine then in conjunction with volume fracturing down-hole micro-seismic monitoring fracture half-length scope.
4) optimization of well array pitch
The methods such as integrated application reservoir engineering, mining site statistics, numerical simulation and down-hole micro-seismic monitoring, take into full account difference
Reservoir characteristic, with reference to Water-drive control area than optimization well array pitch.
1. the determination of well spacing：Rational spacing between wells is determined according to oil well man-made fracture length and Water-drive control area ratio.
2. the determination of array pitch：Different reservoir feature is taken into full account, the exploitation to 3 class reservoir of Oil in Super-low Permeability compact oil reservoir respectively is moved
State carries out mining site statistical analysiss and determines that different reservoir takes effect the high array pitch scope of degree.On the basis of mining site statistics understanding,
The reasonable array pitch of different reservoir is determined by numerical simulation with reference to Water-drive control ratio.
5) producing well vertically and horizontally distance optimization
Producing well assumes diamond in shape symmetrical (accompanying drawing 1) at well pattern center, with 5 points, anti-7 points, rhombic inverted nini-spot well pattern it is (attached
Fig. 2) compare, it (is 4 that the well pattern oil-water well ratio is high:1)；It is and producing well is lateral well, it is to avoid waterline is advanced along main line, main
The ineffective problem of lateral well to well easy water logging.The cornerwise half in 1 diamond-shaped area y directions of accompanying drawing be fore-and-aft distance, x side
It is lateral separation to cornerwise half.It is according to down-hole micro-seismic monitoring volume fracturing crack bandwidth, belt length monitoring result, comprehensive
Numerical simulation and reservoir engineering method determine vertically and horizontally distance.
6) water injection technology policy
(1) determination of Advance Water Injection amount：Advance Water Injection amount includes two parts, the Advance Water Injection amount and oil well volume of water injection well
Fracturing fluid deposits ground liquid.According to mining site creation data and the statistical analysiss for depositing ground liquid measure, and theoretical meter is carried out according to coefficient of compressibility method
Calculate and determine reasonable Advance Water Injection amount.
(2) determination of water injection intensity：For different reservoir, combined using reservoir numerical simulation and theoretical calculation formula
Method, sets up individual well day water injection intensity plate determining ultra-low penetration compact oil reservoir different type reservoir water injection intensity.
According to actual production present situation, if later stage aqueous rising, can switch to " water injection well cyclic waterflooding, 2., 4. oil-extracting well water injection
Handle up " the supplementary energy mode of interaction.
(3) determination of cyclic waterflooding parameter：According to the mining site statistical analysiss for carrying out cyclic waterflooding test block, optimization note
The water phase, stop note phase, individual well daily water-injection rate.
(4) oil-extracting well water injection is handled up the determination of parameter：Optimize ginseng of handling up according to mining site statistical analysiss and method for numerical simulation
Number.
Compared with prior art, the invention has the advantages that：
The purpose of the present invention is that the Oil in Super-low Permeability changed greatly for Structural range in longitudinal stacking conjunction development that oils, plane is caused
Close oil reservoir, there is provided one kind can adapt to directional well volume fracturing technology, realizes the directional well well-arranging procedure of effective water filling.The well spacing
Method oil-water well ratio is high, can play the ability of extensive volume fracturing, increase substantially individual well initial production, well net optimization
When the method such as integrated application reservoir engineering, numerical simulation, down-hole micro-seismic monitoring, mining site statistics, and taken into full account different storages
Layer feature and reforming technology, it is to avoid Fractured water logging, while meet the requirement for realizing that long term stable production water filling supplements energy, so as to reality
The purpose of the well yield of Oil in Super-low Permeability compact oil reservoir and development benefit is improved now.
【Description of the drawings】
Fig. 1 is volume fracturing directional well flooding pattern and element schematic diagram；
Fig. 2 is volume fracturing directional well routine flooding pattern and element schematic diagram；
Fig. 3 is multiple zone overlapping directional well deployment longitudinal profile schematic diagram；
Fig. 4 is HS oil fields Chang-6 oil reservoir profile；
Fig. 5 is oil-water well fracture half-length's numerical simulation of optimum comparison diagram；
Fig. 6 is volume fracturing man-made fracture down-hole micro-seismic monitoring result figure；
Fig. 7 is half long cartogram of volume fracturing man-made fracture；
Fig. 8 is that man-made fracture enters ground liquid measure and half belt length graph of a relation；
Fig. 9 is array pitch and the Degree of Accord Relation figure that takes effect under the conditions of different reservoir；
Figure 10 is array pitch and the tired oil-producing graph of a relation of the 10th year individual well under the conditions of different reservoir；
Figure 11 is volume fracturing man-made fracture bandwidth statistics figure；
Figure 12 is time and recovery percent of reserves graph of a relation under the conditions of different oil well fore-and-aft distances；
Figure 13 is different reservoir individual well day water injection intensity figure.
Wherein：1-producing well, 2-water injection well, 3-well spacing, 4-array pitch, 5-well fracture half-length, 6-oil well crack
Half is long, 7-oil well fore-and-aft distance, 8- oil well lateral separations, the multiple zone of 9-composite stack.
【Specific embodiment】
Below in conjunction with the accompanying drawings the present invention is described in further detail：
Referring to Fig. 1-Figure 13, Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure of the present invention, comprise the following steps：
1) carry out integrated geological interpretation first, preferred orientation Jing Jingwangbushuqu is carried out reservoir classification and evaluation, determines the main force
Contribution interval.
1. Dominated Factors are enriched with by sedimentary micro, Diagenetic Facies and high yield first in plane and determine advantageous deposition phase
Band, then comprehensive geology and reservoir engineering method analysis reservoir properties and pore throat character feature by reservoir porosity, movable flow
Body saturation, four parameters of pore constriction radius and free-boundary problem set up classification factor, according to classification factor and permeability
Relation determine Reservoir Classification (subordinate list 1), and then determine directional well well net deployment region.
2. Production development is combined on longitudinal direction, main force's contribution interval is found using composite index law.
The dependency relation of oil well productivity and log parameter is analyzed by mining site creation data, impact oil well initial stage product is filtered out
The major parameter of energy is permeability, interval transit time and resistivity (subordinate list 2), calculates comprehensive by below equation as independent variable
Hop index is determining main layer.
1 Oil in Super-low Permeability compact reservoir classification chart of subordinate list
2 oil well productivity of subordinate list and log parameter correlation coefficient
Normalized parameter：
Proportion：
Aggregative index：I=λK·K'+λAC·AC'+λRT·RT'
In formula：K-permeability, mD；K'-normalization permeability；Kmin、Kmax- permeability limits, the upper limit, mD；AC-sound
The ripple time difference, μ s/m；AC'-normalization interval transit time；ACmin、ACmax- interval transit time lower limit, the upper limit, μ s/m；RT-resistivity,
Ω·m；RT'-normalized resistance rate；RTmin、RTmax- resistivity lower limit, the upper limit, Ω m；λ-proportion；λi- phase relation
Number；I-aggregative index.
2) well arranges the optimization in direction
1. according to imaging logging, the test result of down-hole microseism, determine that biggest principal stress direction is NE75 °.
2. directional well well pattern array pitch direction should be perpendicular to biggest principal stress direction, to ensure on fracturing technology to directional well
Optimal fracturing effect is realized, well yield is improved.
3) optimization of oil-water well fracture length：
In the well pattern, water injection well is changed to wire water filling by past spot flooding, on the one hand increases Water-drive control scope；
On the other hand reduce water injection pressure, it is to avoid the unlatching of dynamic crack in waterflooding extraction, and due to water injection well man-made fracture band
Width reduces array pitch, is more beneficial for setting up effective displacement pressure system.
Optimum Matching simulation is carried out to oil-water well fracture length using method for numerical simulation.Oil well level pressure is produced, shaft bottom stream
Voltage-controlled system designs 5 kind schemes in 30MPa in 6.5MPa, the control of water injection well bottom pressure, is combined by stitching net, comprehensive oil reservoir work
Cheng Fangfa, optimization determine the Optimum Matching value i.e. oil well fracture half-length 250m in oil-water well crack, and fracture half-length 125m is (attached for well
Fig. 5).At present the fracture half-length of volume fracturing man-made fracture down-hole micro-seismic monitoring be typically in the range of between 200～300m (accompanying drawing 6,
7) accompanying drawing, can reach the requirement of optimization fracture half-length.The relation of ground liquid measure and half belt length of man-made fracture is entered according to man-made fracture
(accompanying drawing 8), it is 800m that design oil well volume fracturing enters ground liquid measure3。
4) optimization of well array pitch
The methods such as integrated application reservoir engineering, mining site statistics, numerical simulation and down-hole micro-seismic monitoring, take into full account difference
Reservoir characteristic, with reference to Water-drive control area than optimization well array pitch.
1. the determination of well spacing：Well spacing, according to the long determination of man-made fracture seam, is to realize rational Water-drive control area ratio, reach
With reference to hole pattern, the purpose for effectively employing and improving rate of oil production of seam reserves, determines that rational spacing between wells is 1000m.Well spacing is little,
Energy supplement is sufficient, but while aqueous rise soon；Well spacing is big, although aqueous to rise slowly, but energy cannot be supplemented in time, yield
It is low.
2. the determination of array pitch：Different reservoir feature is taken into full account, the exploitation to 3 class reservoir of Oil in Super-low Permeability compact oil reservoir respectively is moved
State carries out mining site statistical analysiss and determines that different reservoir takes effect the high array pitch scope of degree and irrational array pitch scope (accompanying drawing
9).On the basis of mining site statistics understanding, with reference to Water-drive control ratio by arranging under the conditions of numerical simulation study different reservoir physical property
Away from for 60～180m when technical specification, research show 3 class reservoir of Oil in Super-low Permeability compact oil reservoir array pitch be respectively I classes 150m, II
Oil-producing maximum or amplification are tired out when class 120-130m, Group III 100-120m to be reduced, and is reasonable array pitch (accompanying drawing 10).
5) producing well vertically and horizontally distance optimization
Producing well assumes diamond in shape symmetrical (accompanying drawing 1) at well pattern center, with 5 points, anti-7 points, rhombic inverted nini-spot well pattern it is (attached
Fig. 2) compare, it (is 4 that the well pattern oil-water well ratio is high:1)；It is and producing well is lateral well, it is to avoid waterline is advanced along main line, main
The ineffective problem of lateral well to well easy water logging.The cornerwise half in 1 diamond-shaped area y directions of accompanying drawing be fore-and-aft distance, x side
It is lateral separation to cornerwise half.Determined vertically and horizontally according to down-hole micro-seismic monitoring, numerical simulation and reservoir engineering method
Distance.
The determination of fore-and-aft distance：Down-hole micro-seismic monitoring volume fracturing crack bandwidth (accompanying drawing 11) between 40～80m,
In the case where water injection technology policy, production well proration are constant, when fore-and-aft distance is respectively 40m, 60m, 80m, integrated application
The method that numerical simulation and reservoir engineering combine, when determining that fore-and-aft distance is 60m, effect is preferable (accompanying drawing 12).
The determination of lateral separation：With reference to oil well volume fracturing fracture half-length and Water-drive control area ratio, lateral separation is determined
For 250m.
6) water injection technology policy
1. the determination of Advance Water Injection amount：Shown with the statistical analysiss for depositing ground liquid measure according to mining site creation data, deposit ground liquid measure
The ground liquid of depositing with stable production period with positive correlation, extensive volume fracturing rises the strata pressure around crack, indirectly
Play a part of Advance Water Injection, therefore Advance Water Injection amount includes two parts, the Advance Water Injection amount and oil well volume fracturing of water injection well
Liquid deposits ground liquid.Counted based on mining site, and Theoretical Calculation is carried out according to coefficient of compressibility method and determine reasonable Advance Water Injection amount.
Δ V=Vw+VF=Ct·A·h·φ·ΔP
In formula：Δ V-Advance Water Injection amount, m3；VwThe Advance Water Injection amount of-water injection well, m3；VF- 4 mouthfuls of oil well volume fracturings
Deposit ground liquid total amount, m3；Ct- stratum system compressibility, MPa-1；A-well-pattern spacing, m2；H-core intersection, m；φ—
Porosity, %；Δ P-pressure differential, MPa.
2. the determination of water injection intensity：For different reservoir and fracturing reform mode, using reservoir numerical simulation and theoretical meter
The method that formula combines is calculated, individual well day water injection intensity plate (accompanying drawing 13) is established, it is determined that ultra-low penetration compact oil reservoir is not
Same type reservoir water injection intensity is I 1.2～1.7m of class3/ (d.m), II 0.9～1.2m of class3/ (d.m), 0.5～0.9m of Group III3/
(d.m)。
According to actual production present situation, if later stage aqueous rising, can switch to " water injection well cyclic waterflooding, 2., 4. oil-extracting well water injection
Handle up " the supplementary energy mode of interaction.
3. the determination of cyclic waterflooding parameter：According to the mining site statistical analysiss for carrying out cyclic waterflooding test block, optimization note
The water phase is 20d, stops the note phase for 20d, individual well day note be 10m3/ d, specifically can be adjusted according to practical condition.
4. oil-extracting well water injection is handled up the determination of parameter：According to mining site statistics and method for numerical simulation optimization individual well day note it is
10m3/ d, continuous water filling 30d, start to recover the oil after stewing well 20d, and next round is handled up according to depending on the concrete condition of production.
The well spacing that basic well pattern is adopted by the preferred volume fracturing directional well note of above step is 1000m, and array pitch is not according to
The determination of same type reservoir, I class 150m, II classes 120-130m, Group III 100-120m；4 mouthfuls of orientation oil wells are intracardiac in Pedicellus et Pericarpium Trapae in well pattern
Shape is symmetrical, fore-and-aft distance 60m, lateral separation 250m；Oil well, well crack dummy joint length are respectively 250m, 125m.
The present invention on the basis of analysis and summary volume fracturing effect, by carrying out integrated geological interpretation and directional well volume
The adaptation Journal of Sex Research of fracturing technology and well pattern, the Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure of proposition, with
Lower beneficial effect：
(1) water injection well is changed to wire water filling by past spot flooding, on the one hand increases Water-drive control scope；The opposing party
Face reduces water injection pressure, it is to avoid the unlatching of dynamic crack in waterflooding extraction, and as water injection well man-made fracture bandwidth reduces
Array pitch, is more beneficial for setting up effective displacement pressure system.
(2) producing well assumes diamond in shape distribution at well pattern center, with 5 points, anti-7 points, rhombic inverted nini-spot well pattern (accompanying drawing 2) phase
Than it (is 4 that the well pattern oil-water well ratio is high:1)；It is and producing well is lateral well, it is to avoid waterline is advanced along main line, main to hold to well
Easily water logging and the ineffective problem of lateral well.
(3) for overlapping development on reservoir longitudinal direction, the fine water filling of water injection well layering, producing well layering volume fracturing are fixed
Whole oil reservoir is drilled to injection-production well, main force's contribution layers different on longitudinal direction are largely exploited.
(4) method such as integrated application reservoir engineering, mining site statistics, numerical simulation and down-hole micro-seismic monitoring, takes into full account
Different reservoir feature, with reference to Water-drive control area than optimizing the fore-and-aft distance between well array pitch and oil well crack.
(5) it is divided into two stages in energy supplement mode：Before first stage well water rises, using water injection well and calmly
To the Advance Water Injection energy supplement mode that well volume fracturing combines.In the stage well pattern, initial stage stable yields Main Basiss deposit ground hydraulic pressure
Power discharges, and later stage stable yields respectively occupies leading position in different regions according to water drive and pseudo-elastic approximation dissolved gas drive, two ways,
Later stage Main Basiss pseudo-elastic approximation dissolved gas drive in oil well diamond-shaped area.After second stage well water rises, with reference to Oil in Super-low Permeability
The characteristics of compact oil reservoir imbibition effect is strong, can flexibly be changed into " water injection well cyclic waterflooding, 2., 4. oil-extracting well water injection is handled up " interaction
The new model of the supplementary energy of development.
(6) in drilling fracturing implementation process, it is to realize Advance Water Injection and avoid engineering from disturbing, working procedure is：Bore note
Well → pressure break water injection well → water injection well water filling → drilling oil well → pressure break producing well (2., 4. producing well answers concurrent fracturing).Note
Being intended to bore answers pressure release to stop note with water injection well during pressure break producing well.
Using a kind of ultra-low penetration compact oil reservoir volume fracturing directional well well-arranging procedure acquired by the present invention in E Erduo
This basin HS oil fields Chang-6 oil reservoir achieves preferable development effectiveness.
HS oil fields Chang-6 oil reservoir major developmental in half Shen Hu and deep lacustrine facies area, reservoir sandbody with remote source delta front with it is front
Based on the turbid long-pending body in delta, sand body is big by composite stack thickness, but single sand body thickness of thin, interlayer exist obvious mud stone every
Layer, plane heterogeneity is strong, oil-containing sex differernce is big, and structural relief changes greatly, belongs to typical stratiform lithological pool (Fig. 4).Should
Oil reservoir length 62Average buried depth 1686m, long 63Average buried depth 1725m, long 62, it is long by 63Average effective pay thickiness is 15.9m, averagely
Porosity is 11.0%, mean permeability 0.22mD.56.4 DEG C of reservoir temperature, original formation pressure is 14.5MPa, pressure coefficient
For 0.79, it is low hole, hypotonic, low pressure lithological pool.
Using the well-arranging procedure of the present invention in HS oil fields Chang-6 oil reservoir finishing drilling multiple wells, long 6 are realized2, it is long by 63Multilamellar is effective
Employ.Water injection well adopts extensive volume fracturing reforming mode using conventional fracturing reform mode, producing well, and yield is fixed for adjacent area
To 2～3 times of well, the purpose that water filling under directional well volume fracturing supplements energy is realized, is reduced and is successively decreased.
Above content technological thought only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, claims of the present invention is each fallen within
Protection domain within.
Claims (6)
1. a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure, it is characterised in that comprise the following steps：
1) carry out integrated geological interpretation first, preferred orientation Jing Jingwangbushuqu carries out reservoir classification and evaluation, determines that the main force contributes
Interval；
2) optimize well row direction：
2-1) according to imaging logging, the test result of down-hole microseism, biggest principal stress direction is determined；
2-2) directional well well pattern array pitch direction is perpendicular to biggest principal stress direction；
3) optimize oil-water well fracture length：
In well pattern, water injection well is wire water filling；Optimum Matching simulation is carried out to oil-water well fracture length using method for numerical simulation；
Combined by stitching net, comprehensive reservoir engineering method, volume fracturing man-made fracture down-hole micro-seismic monitoring result, optimization determine profit
The Optimum Matching value in well crack is oil well fracture half-length 250m, well fracture half-length 125m；According to man-made fracture enter ground liquid measure with
The relation of half belt length of man-made fracture, it is 800m that design oil well volume fracturing enters ground liquid measure3；
4) optimization of well array pitch：
Using the method for reservoir engineering, mining site statistics, numerical simulation and down-hole micro-seismic monitoring, take into full account that different reservoir is special
Levy, with reference to Water-drive control area than optimization well array pitch；
5) optimize producing well vertically and horizontally distance：
Producing well assume diamond in shape at well pattern center it is symmetrical, oil-water well ratio be 4:1, and producing well is lateral well；According to well
Lower micro-seismic monitoring, numerical simulation and reservoir engineering method determine vertically and horizontally distance；
6) optimization design water filling policy.
2. Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure according to claim 1, it is characterised in that step 1)
Concrete grammar it is as follows：
Dominated Factors are enriched with by sedimentary micro, Diagenetic Facies and high yield first in plane 1-1) and determine favorable sedimentary facies belt,
Then comprehensive geology and reservoir engineering method analyze reservoir properties and pore throat character feature, by reservoir porosity, movable fluid
Saturation, four parameters of pore constriction radius and free-boundary problem set up classification factor, according to classification factor and permeability
Relation determines Reservoir Classification, and then determines directional well well net deployment region；
Production development 1-2) is combined on longitudinal direction, main force's contribution interval is found using composite index law；
The dependency relation of oil well productivity and log parameter is analyzed by mining site creation data, filtering out affects oil well initial productivity
Major parameter is permeability, interval transit time and resistivity, calculates aggregative index come really by below equation as independent variable
Determine main layer；
Normalized parameter：
Proportion：
Aggregative index：I=λK·K'+λAC·AC'+λRT·RT'
In formula：K is permeability, and unit is mD；K' is normalization permeability；Kmin、KmaxFor permeability limits, the upper limit, unit is
mD；AC is interval transit time, and unit is μ s/m；AC' is normalization interval transit time；ACmin、ACmaxFor interval transit time lower limit, the upper limit,
Unit is μ s/m；RT is resistivity, and unit is Ω m；RT' is normalized resistance rate；RTmin、RTmaxFor resistivity lower limit, on
Limit, unit are Ω m；λ is proportion；λiFor correlation coefficient；I is aggregative index.
3. Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure according to claim 2, it is characterised in that step 2-
1), in, biggest principal stress direction is NE75 °, and well pattern array pitch direction is perpendicular to biggest principal stress direction.
4. Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure according to claim 1, it is characterised in that step 4)
Concrete grammar it is as follows：
4-1) the determination of well spacing：Well spacing is defined as 1000m according to man-made fracture seam length；
4-2) the determination of array pitch：Mining site statistical analysiss determination is carried out to the development behavior of 3 class reservoir of Oil in Super-low Permeability compact oil reservoir respectively
Go out different reservoir to take effect the high array pitch scope of degree and irrational array pitch scope；On the basis of mining site statistics understanding, with reference to
Technical specification when Water-drive control ratio is 60～180m by array pitch under the conditions of numerical simulation study different reservoir physical property, studies table
The array pitch of 3 class reservoir of bright Oil in Super-low Permeability compact oil reservoir is respectively tired oil-producing when I class 150m, II classes 120-130m, Group III 100-120m
Maximum or amplification is reduced, and is reasonable array pitch.
5. Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure according to claim 1, it is characterised in that step 5)
Concrete grammar it is as follows：
5-1) the determination of fore-and-aft distance：Down-hole micro-seismic monitoring volume fracturing crack bandwidth between 40～80m, in water filling plan
Slightly, in the case that production well proration is constant, when fore-and-aft distance is respectively 40m, 60m, 80m, integrated application numerical simulation and oil
The method that engineering combines is hidden, determines that fore-and-aft distance is 60m；
5-2) the determination of lateral separation：With reference to oil well volume fracturing fracture half-length and Water-drive control area ratio, lateral separation is determined
For 250m.
6. Oil in Super-low Permeability compact oil reservoir volume fracturing directional well well-arranging procedure according to claim 1, it is characterised in that step 6)
Concrete grammar it is as follows：
6-1) the determination of Advance Water Injection amount：Advance Water Injection amount includes two parts, the Advance Water Injection amount and oil well volume pressure of water injection well
Split liquid and deposit ground liquid；Counted based on mining site, and Theoretical Calculation is carried out according to coefficient of compressibility method and determine reasonable Advance Water Injection amount；
Δ V=Vw+VF=Ct·A·h·φ·ΔP
In formula：Δ V is Advance Water Injection amount, and unit is m3；VwFor the Advance Water Injection amount of water injection well, unit is m3；VFFor 4 mouthfuls of oil well bodies
Overstock to split and deposit ground liquid total amount, unit is m3；CtFor stratum system compressibility, unit is MPa-1；A is well-pattern spacing, single
Position is m2；H is core intersection, and unit is m；φ is porosity, and unit is %；Δ P is pressure differential, and unit is MPa；
6-2) the determination of water injection intensity：For different reservoir and fracturing reform mode, using reservoir numerical simulation and Theoretical Calculation
The method that formula combines, sets up individual well day water injection intensity plate, determines ultra-low penetration compact oil reservoir different type reservoir water filling
Intensity is I 1.2～1.7m of class3/ (d.m), II 0.9～1.2m of class3/ (d.m), 0.5～0.9m of Group III3/(d.m)；
6-3) the determination of cyclic waterflooding parameter：According to the mining site statistical analysiss for carrying out cyclic waterflooding test block, optimal water injection
Phase is 20d, stops the note phase for 20d, individual well day note be 10m3/d；
6-4) oil-extracting well water injection is handled up the determination of parameter：It is 10m according to mining site statistics and method for numerical simulation optimization individual well day note3/
D, continuous water filling 30d, start to recover the oil after stewing well 20d.
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