CN104278980B - A kind of method using transformation volume to optimize fine and close profit horizontal well seam network parameters - Google Patents

A kind of method using transformation volume to optimize fine and close profit horizontal well seam network parameters Download PDF

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Publication number
CN104278980B
CN104278980B CN201310286976.5A CN201310286976A CN104278980B CN 104278980 B CN104278980 B CN 104278980B CN 201310286976 A CN201310286976 A CN 201310286976A CN 104278980 B CN104278980 B CN 104278980B
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seam
volume
reservoir
network parameters
transformation
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CN104278980A (en
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樊凤玲
李忠兴
赵振峰
李宪文
张矿生
唐梅荣
王文雄
王广涛
曹宗雄
徐创朝
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China Petroleum and Natural Gas Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures

Abstract

The invention discloses a kind of method using transformation volume to optimize fine and close profit horizontal well seam network parameters, belong to fine and close profit horizontal well reservoir field.This method, for compact reservoir, first evaluates geologic characteristics, specifies volume fracturing and forms the concrete reservoir conditions of volume seam net system, and then research level well volume fracturing difference transformation volume, the cloth seam mode impact on production capacity, optimize concrete seam network parameters;Described method at least includes: the seam net characteristic synthetic 1, setting up compact reservoir volume fracturing evaluates basic methods;2, fine and close oil volume productivity of fractured prognosis modelling model method is set up.Fine and close oil-reservoir water horizontal well pressure-break network parameters is optimized by the transformation volume to be formed during pressure break, certain transformation volume is formed in fine and close oil reservoir, formation substrate, to crack beeline seepage flow, is substantially reduced the driving pressure of effectively flowing, it is achieved the flowing under the conditions of extremely low permeability.Be conducive to well yield is greatly improved.

Description

A kind of method using transformation volume to optimize fine and close profit horizontal well seam network parameters
Technical field
The present invention relates to fine and close profit horizontal well reservoir field, use transformation volume to optimize fine and close oil level particularly to one The method of well seam network parameters.
Background technology
Fine and close oil is the abbreviation of compact reservoir oil, is a kind of non-conventional oil resource, main compose deposit space be tight sand, The unconventional reservoir such as marl, dolomite.These unconventional reservoir have the features such as porosity is little, permeability is low, ordinary circumstance Lower relatively low without natural production capacity or production capacity, exploration and development difficulty is bigger.
In fine and close developing of reservoirs, owing to pore pressure declines, effective stress is caused to increase, reservoir rock hole Gap, crack deform upon and are affected with permeability.Fine and close for compact oil reservoir reservoir, pore throat is trickle, reservoir heterogeneity is strong, Intrinsic fracture is grown, the characteristic that formation of seepage in oil reservoir is complicated.At present how crack is carried out for such oil reservoir to optimize, do not have to borrow The method of mirror.
Prior art uses conventional low-permeability oil deposit reservoir reconstruction hydraulic fracture optimization method, so-called LOW PERMEABILITY RESERVOIR in early stage Generally use the method for fractured horizontal well to improve reservoir productivity, due to complex geologic conditions and polymorphic mature fault, make Obtain fractured horizontal well fracture parameters and fracturing effect is played conclusive effect.This transformation hydraulic fracture method is to lead with crack Stream ability is mated with Reservoir Seepage ability, fracture orientation, fracture half-length and well pattern match and carry out Optimum Hydraulic fracture parameters, tradition Fracture parameters design need consider penetration ratio, general penetration ratio is 0.4-0.7 zero dimension, and fracture parameters will not be superimposed upon one Rise.The method hyposmosis relatively good for Reservoir Seepage ability, ultra-low penetration oil reservoir, form oil reservoir to crack in reservoir And crack is to " bilinear flow " Seepage mode of pit shaft, achieves the effect of preferably application.
But, for compact reservoir oil, due to reasons such as the growth of reservoir intrinsic fracture, fine and close, the seepage flow characteristics complexity of reservoir, The method being unsuitable for using tradition low permeability pay transformation hydraulic fracture to optimize, and on-the-spot test shows, uses traditional method Fine and close profit horizontal well is improved well yield amplitude little, it is difficult to realize fine and close oily cost-effective exploitation.
Summary of the invention
In order to solve problem of the prior art, embodiments provide a kind of employing and transform the fine and close profit of volume optimization The method of horizontal well seam network parameters.In fine and close oil reservoir, form certain transformation volume, with optimum transformation volume target, optimize seam Network parameters, formation substrate, to crack beeline seepage flow, is substantially reduced the driving pressure of effectively flowing, it is achieved in extremely low permeability Under the conditions of flowing, be beneficial to realize fine and close oily cost-effective exploitation.Described technical scheme is as follows:
A kind of method using transformation volume to optimize fine and close profit horizontal well seam network parameters, for compact reservoir, first evaluates Geologic characteristics, specifies volume fracturing and forms the concrete reservoir conditions of volume seam net system, then research level well volume pressure Split different transformation volume, the cloth seam mode impact on production capacity, optimize concrete seam network parameters;Described method at least includes: 1, build The seam net characteristic synthetic of vertical compact reservoir volume fracturing evaluates basic methods;2, fine and close oil volume productivity of fractured prognosis modelling is set up Model method.
Specifically, seam net characteristic synthetic described 1, that set up compact reservoir volume fracturing evaluates basic methods;It is by grinding Study carefully district's reservoir characteristic and fracture evaluation, set up the seam net feature of volume fracturing;Described method at least includes: step 1) intrinsic fracture Characteristic evaluating;Step 2) rock rupture characteristic evaluating;Step 3) stress field and Assessment of Changes thereof;The test of crack, step 4) scene is commented Valency.
Described step 1) Characteristics of The Matural Fractures is evaluated;
By outcrop observation, core description, image logging interpretation means, reservoir Characteristics of The Matural Fractures is evaluated, And integrated natural crack figure feature and rock-mechanics property, conclusion is that hydraulic fracture is extended and has impact by intrinsic fracture;
Step 2) rock rupture characteristic evaluating;
By being evaluated rock rupture feature, conclusion is that reservoir rock fragility is relatively strong, smashes storage by volume fracturing Layer, forms bad break, sliding, shearing crack, forms volume transformation basis in reservoir;
Step 3) stress field and Assessment of Changes thereof;
A) by being evaluated reservoir rock stress characteristics, conclusion is that reservoir-level two is little to stress difference, and is less than Storage barrier stress is poor, it is possible to produces branch's seam in oil reservoir, forms a certain degree of seam net;
B) additional stress evaluation of effect to former stress field is induced by fracturing, in crack when conclusion is fracturing Near wall can produce induced stress, and when induced stress difference reaches to a certain degree, two diminish to stress difference, advantageously form Complicated seam net;
C) after compact reservoir pressure break produces induction additional stress, the horizontal stress difference near crack is 0.2-3.6MPa, profit Change in fractuer direction, produce seam net;
The crack test evaluation of step 4) scene;
Being monitored in real time by down-hole microseism, evaluate seam net feature, conclusion is that compact reservoir volume fracturing can produce more Complicated seam net system, forms large range of transformation volume basis by volume fracturing;
The seam net characteristic synthetic that each step described is formed evaluates basis, it is achieved during compact reservoir pressure break, and hydraulic fracture is met Intrinsic fracture can relatively easily open intrinsic fracture, forms the network system of man-made fracture and intrinsic fracture.
Specifically, described 2, set up fine and close oil volume productivity of fractured prognosis modelling model method;It is by specific well pattern bar Under part, the transformation volume impact on recovery percent of reserves of horizontal well volume fracturing, Optimizing Reconstruction volume, and optimum level well volume fracturing Cloth seam mode, seam guipure width, band slit network parameters;Described method at least includes: step 1) transformation volume optimization;Step 2) cloth seam Method optimizing;Step 3) seam network parameters optimization;Crack, step 4) scene is tested.
The transformation volume optimization of described step 1);In conjunction with compact reservoir feature, set up volume fracturing capability forecasting analogue model, According to different well pattern conditions, the different transformation volume impact on recovery percent of reserves, Optimizing Reconstruction volume;Set up seam net dual media mould Type;
Theoretical model includes below equation:
(1) flow equation:
V ‾ m = - K m μ grad P m
In formula (1):
V represents that percolation flow velocity, K represent that permeability, P represent that pressure, μ represent fluid viscosity;
(2) state equation:
ρ=ρoexp(1+CLP)
In formula (2):
ρ represents that fluid density, C represent that coefficient of compressibility, P represent pressure;
(3) equation of continuity:
φ m C m ∂ P m ∂ t - k m μ div ( grad P m ) + a K f μ ( P m - P f ) = 0
In formula (3):
φ represent porosity, C represent coefficient of compressibility, P represent pressure, K represent permeability, μ represent fluid viscosity, α be with The specific surface of rock, pore structure are relevant, represent the parameter of fissured rock feature;
Subscript m represents the parameter of substrate (matrix), and subscript f represents the parameter of crack (fracture).
Further, the described canonical parameter setting up seam net double medium model: oil reservoir porosity φ is 9%, oil reservoir permeates Rate K is 0.1-0.3mD, and in the middle part of oil reservoir, original formation pressure P is 16-18MP, and pressure coefficient is 0.75-0.85, and underground crude oil glues Degree μ is 0.7-0.8mPa.s, original dissolving oil-gas ratio 75.7m3/ t, oil compressibility C are 14-16 × 10-4/MPa。
Described step 2) cloth seam method optimizing;According to the numerical model set up under optimum transformation volume, for natural energy Exploit the impact on recovery percent of reserves of the horizontal well volume fracturing under different well pattern forms, bonding crack net length, width parameter pair The impact of yield, selects different cloth seam mode, optimizes and form a) alternating expression cloth seam mode;B) dumbbell type interlock cloth seam mode.
Described a) alternating expression cloth seam mode is to form alternating expression cloth seam mode for natural energy well net optimization;For nature Energy well pattern is produced multiple cracking by artificial fracturing, then carries out pressure break knitmesh;Described adjacent horizontal direction upper and lower n-layer substrate Rock mass all forms alternating expression cloth crack structure between adjacent vertical direction Fracture System, constitutes the seam net system of many seams System.
Described b) dumbbell type interlock cloth seam mode;Between described adjacent vertical direction Fracture System, it is positioned at adjacent water Square forming dumbbell type to the middle part of upper and lower n-layer substrate rock mass interlocks cloth crack structure, constitutes the seam net system of many seams.
The seam network parameters optimization of described step 3);Under optimum transformation volume, according to different seam guipure length, bandwidth, pressure break The hop count impact on recovery percent of reserves, is separately optimized seam guipure length, bandwidth seam network parameters, is formed according to transformation volume optimization seam net ginseng The method of number superposition;Described a) alternating expression cloth seam mode and b) dumbbell type interlock cloth seam mode, use crack vertical with horizontal well Time Productivity Formulae flow equation, state equation, equation of continuity simultaneous solution prediction low permeability oil field pressure break horizontal well production; For alternating share, by improving scope of construction item, it is 500m including liquid measure3Above, discharge capacity is 6m3/ more than min, it is thus achieved that optimization Seam net Overlay.
Crack, described step 4) scene is tested;By the transformation volume target formed in study area densification oil reservoir, optimize Seam network parameters, forms substrate to crack beeline seepage flow.
The technical scheme that the embodiment of the present invention provides has the benefit that
The embodiment of the present invention, for fine and close oil-layer characteristic, optimizes fine and close oil by " the transformation volume " to be formed during pressure break The method of layer fractured horizontal well seam network parameters.The method changes tradition low permeability reservoir Optimized fracturing design theory, at fine and close oil Form certain transformation volume in layer, provide a set of adaptability relatively for fine and close oil-reservoir water horizontal well volume fracturing seam network parameters optimization Strong method, compensate for using the conventional low permeability pay seam unconformable problem of network parameters optimization method.Be conducive to being greatly improved Well yield.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings Accompanying drawing.
Fig. 1 is that the transformation volume that uses that the embodiment of the present invention provides optimizes the method flow of fine and close profit horizontal well seam network parameters Figure;
Fig. 2 is to change in the method using transformation volume optimization densification profit horizontal well seam network parameters that the embodiment of the present invention provides Make volume and optimize facade structures schematic diagram;
Fig. 3 is to change in the method using transformation volume optimization densification profit horizontal well seam network parameters that the embodiment of the present invention provides Make volume principle of optimality schematic diagram;
Fig. 4 is to hand in the method using transformation volume optimization fine and close profit horizontal well seam network parameters that the embodiment of the present invention provides Wrong formula cloth seam mode structural representation;
Fig. 5 is the simulation seam net staggered cloth seam result schematic diagram of Fig. 4 that the embodiment of the present invention provides;
Fig. 6 is mute in the method using transformation volume optimization fine and close profit horizontal well seam network parameters that the embodiment of the present invention provides Bell formula interlock cloth seam mode structural representation;
Fig. 7 is the simulation seam net superposition cloth seam result schematic diagram of Fig. 6 that the embodiment of the present invention provides.
In figure, each symbol represents that implication is as follows:
1 pit shaft, 2 substrate rock mass, 3 Fracture Systems,
In figure, the direction of arrow is the channelling direction of substrate and crack.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention Formula is described in further detail.
Shown in Figure 1, the embodiment of the present invention should for the conventional low permeability pay fracturing fracture parameter optimization method of employing The problem inadaptable, well yield increase rate is little is there is, it is provided that a kind of employing for fine and close oil-reservoir water horizontal well reservoir reconstruction Transformation volume optimizes the method for fine and close profit horizontal well seam network parameters.The method, for compact reservoir, first evaluates reservoir geology special Levy, specify volume fracturing and form the concrete reservoir conditions of volume seam net system, the then transformation of research level well volume fracturing difference The seam mode impact on production capacity of volume, cloth, optimizes concrete seam network parameters.Specifically include that 1, set up compact reservoir volume fracturing Seam net characteristic synthetic evaluate basic methods;2, fine and close oil volume productivity of fractured prognosis modelling model method two parts are set up.
1, the seam net characteristic synthetic setting up compact reservoir volume fracturing evaluates basic methods;It is by study area reservoir characteristic And fracture evaluation, set up the seam net feature of volume fracturing.Specifically, described method at least includes: step 1) Characteristics of The Matural Fractures Evaluate;Step 2) rock rupture characteristic evaluating;Step 3) stress field and Assessment of Changes thereof;The crack test evaluation of step 4) scene; Wherein,
Step 1) Characteristics of The Matural Fractures is evaluated;
By outcrop observation, core description, image logging interpretation means, reservoir Characteristics of The Matural Fractures is evaluated, And integrated natural crack figure feature and rock-mechanics property, conclusion is that hydraulic fracture is extended and has impact by intrinsic fracture;
Step 2) rock rupture characteristic evaluating;
By being evaluated rock rupture feature, conclusion is that reservoir rock fragility is relatively strong, can be beaten by volume fracturing Broken reservoir, forms bad break, sliding, shearing crack, forms " artificial permeability " in reservoir, has certain volume transformation base Plinth;
Step 3) stress field and Assessment of Changes thereof;
A) by being evaluated reservoir rock stress characteristics, conclusion is that reservoir-level two is little to stress difference, and is less than Storage barrier stress is poor, it is possible to produces branch's seam in oil reservoir, forms a certain degree of seam net;
B) additional stress evaluation of effect to former stress field is induced by fracturing, in crack when conclusion is fracturing Near wall can produce induced stress, and when induced stress difference reaches to a certain degree, two diminish to stress difference, advantageously form Complicated seam net;
C) after compact reservoir pressure break produces induction additional stress, the horizontal stress difference near crack is 0.2-3.6MPa, profit Change in fractuer direction, produce seam net;
The crack test evaluation of step 4) scene;
Being monitored in real time by down-hole microseism, evaluate seam net feature, conclusion is that compact reservoir volume fracturing can produce more Complicated seam net system, forms large range of transformation volume basis by volume fracturing.
The seam net characteristic synthetic that each step is formed above evaluates basis, it is achieved during compact reservoir pressure break, and hydraulic fracture is met Intrinsic fracture can relatively easily open intrinsic fracture, forms the network system of man-made fracture and intrinsic fracture.
2, fine and close oil volume productivity of fractured prognosis modelling model method is set up;Be by specific well pattern under the conditions of, horizontal well The volume fracturing transformation volume impact on recovery percent of reserves, Optimizing Reconstruction volume, and with optimum transformation volume optimum level well body Overstock seam network parameters such as splitting cloth seam mode, seam guipure width, belt length.Specifically, described method at least includes: step 1) transformation volume Optimize;Step 2) cloth seam method optimizing;Step 3) seam network parameters optimization;Crack, step 4) scene is tested;Wherein,
Step 1) transformation volume optimization;Binding district compact reservoir feature, establishes the simulation of volume fracturing capability forecasting Model, under the conditions of different well patterns, the different transformation volume impacts on recovery percent of reserves, optimize transformation volume;
See shown in Fig. 2, Fig. 3, owing to the net pressure around pit shaft 1 is higher, so the substrate rock mass 2 of surrounding produces Raw multiple cracking system 3 probability is high, forms the channelling of substrate and crack, knot between adjacent n-th layer substrate rock mass 2 grid Opinion is that the compact reservoir that intrinsic fracture is grown has Flow through media with double-porosity feature, based on this reservoir characteristics, sets up seam net dual Dielectric model;
Theoretical model includes below equation:
(1) flow equation:
V ‾ m = - K m μ grad P m
In formula (1):
V represents that percolation flow velocity, K represent that permeability, P represent that pressure, μ represent fluid viscosity;
(2) state equation:
ρ=ρoexp(1+CLP)
In formula (2):
ρ represents that fluid density, C represent that coefficient of compressibility, P represent pressure;
(3) equation of continuity:
φ m C m ∂ P m ∂ t - k m μ div ( grad P m ) + a K f μ ( P m - P f ) = 0
In formula (3):
φ represent porosity, C represent coefficient of compressibility, P represent pressure, K represent permeability, μ represent fluid viscosity, α be with The specific surface of rock, pore structure etc. are relevant, represent the parameter of fissured rock feature;
Subscript m represents the parameter of substrate (matrix), and subscript f represents the parameter of crack (fracture).
The canonical parameter setting up seam net double medium model is: oil reservoir porosity φ is 9%, and reservoir permeability K is 0.1- 0.3mD, in the middle part of oil reservoir original formation pressure P be 16-18MP(pressure coefficient be 0.75-0.85), underground viscosity of crude μ is 0.7- 0.8mPa.s, original dissolving oil-gas ratio 75.7m3/ t, oil compressibility C are 14-16 × 10-4/MPa。
Step 2) cloth seam method optimizing;According to the numerical model set up under optimum transformation volume, open for natural energy Adopt, the impact on recovery percent of reserves of horizontal well volume fracturing under the different well pattern form such as five-spot pattern, seven spot pattern, bonding crack The parameter impacts on yield such as net length, width, select different cloth seam mode, optimize and form a) alternating expression cloth seam mode;B) mute Bell formula interlock cloth seam mode;
A) alternating expression cloth seam mode is to define alternating expression cloth seam mode for natural energy well net optimization;See Fig. 4 institute Show, X in figurefFor crack belt length;WfFor crack bandwidth;Specifically, produced by artificial fracturing for natural energy well pattern and split more Seam, then carries out pressure break knitmesh, and described adjacent horizontal direction upper and lower n-layer substrate rock mass 2 is all at adjacent Vertical Square Between Fracture System 3, form alternating expression cloth crack structure, constitute the seam net system of many seams.
B) dumbbell type interlock cloth seam method optimizing define dumbbell type interlock cloth seam mode;Shown in Figure 6, X in figurefFor Crack belt length;WfFor crack bandwidth;Specifically, as a example by five-spot pattern, between described adjacent vertical direction Fracture System 3, It is positioned at the middle part of adjacent horizontal direction upper and lower n-layer substrate rock mass 2 to form dumbbell type and interlock cloth crack structure, constitutes many seams Seam net system.
The optimization of cloth seam mode is to different types of reservoir, uses different areal models according to Elasticity, analyzes Form the mechanical condition of seam net;When construction, in crack, net pressure exceedes horizontal principal stress difference and tensile strength of rock sum After, new crack can be formed on the basis of original fracture, it is achieved seam net.
Step 3) seam network parameters optimization;Under optimum transformation volume, according to different seam guipure length, bandwidth, pressure break hop count Deng the impact on recovery percent of reserves, it is separately optimized the seam network parameters such as seam guipure length, bandwidth, has defined according to transformation volume optimization seam Network parameters, the method for seam network parameters superposition;Specifically, a) alternating expression cloth seam mode and b) dumbbell type interlock cloth seam mode, generally Crack is used to predict low permeability oil field frac water horizontal well with horizontal well Productivity Formulae (such as formula 1,2,3 simultaneous solution) time vertical Yield;In fractured reservoir is developed, the crack Drilling ratio of individual well directly affects its single well productivity, and horizontal well can increase crack Drilling ratio, therefore horizontal well fracture type reservoir exploitation there is some superiority;By theoretical modeling, a certain degree of seam net is folded Add design, be conducive to improving the well yield of fine and close oil, see the net superposition cloth seam result of simulation seam shown in Fig. 5, Fig. 7.
During field conduct, generally for alternating share, can be 500m including liquid measure by improving scope of construction item3Above, row Amount is 6m3/ min is with first-class, it is thus achieved that the seam net Overlay of optimization.
Crack, step 4) scene is tested;
By the transformation volume formed in study area densification oil reservoir, with optimum transformation volume target, optimize seam net ginseng Number, formation substrate, to crack beeline seepage flow, is substantially reduced the driving pressure of effectively flowing, it is achieved in extremely low permeability condition Under flowing.
Additionally, the embodiment of the present invention also has the advantage that, transformation volume is used to optimize fine and close profit horizontal well seam network parameters Method, achieves significant effect in test at the scene.Up to now, 7 layers of co-occurrence field of 83 wellblock length are pacified at Ordos Basin 19 mouthfuls of wells of test level well, go into operation initial stage average production per well 14.2t/d, than same district horizontal well routine Optimized fracturing design individual well Yield height 9.4t/d, is more than 8-10 times of straight well.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.

Claims (9)

1. one kind uses the method that transformation volume optimizes fine and close profit horizontal well seam network parameters, it is characterised in that for compact reservoir, First evaluate geologic characteristics, specify volume fracturing and form the concrete reservoir conditions of volume seam net system, then research level Well volume fracturing difference transformation volume, the cloth seam mode impact on production capacity, optimize concrete seam network parameters;Described method is at least wrapped Include: the seam net characteristic synthetic 1, setting up compact reservoir volume fracturing evaluates basic methods;2, fine and close oil volume productivity of fractured is set up Prognosis modelling model method;
Described 1, to set up compact reservoir volume fracturing seam net characteristic synthetic evaluates basic methods, is by study area reservoir characteristic And fracture evaluation, set up the seam net feature of volume fracturing, the method at least includes: step 1) Characteristics of The Matural Fractures evaluation;Step 2) rock rupture characteristic evaluating;Step 3) stress field and Assessment of Changes thereof;Step 4) on-the-spot crack test evaluation;Wherein,
Step 1) Characteristics of The Matural Fractures evaluation;
Reservoir Characteristics of The Matural Fractures is evaluated by outcrop observation, core description, image logging interpretation means, and combines Closing intrinsic fracture attitude Characteristics and rock-mechanics property, conclusion is that intrinsic fracture has impact to hydraulic fracture extension;
Step 2) rock rupture characteristic evaluating;
By being evaluated rock rupture feature, conclusion is that reservoir rock fragility is relatively strong, smashes reservoir, shape by volume fracturing Become bad break, sliding, shearing crack, in reservoir, form volume transformation basis;
Step 3) stress field and Assessment of Changes thereof;
A) by being evaluated reservoir rock stress characteristics, it is little to stress difference that conclusion is reservoir-level two, and less than storage every Ply stress is poor, it is possible to produces branch's seam in oil reservoir, forms a certain degree of seam net;
B) additional stress evaluation of effect to former stress field is induced by fracturing, at crack wall when conclusion is fracturing Near can produce induced stress, when induced stress difference reaches to a certain degree, two diminish to stress difference, advantageously form complexity Seam net;
C), after compact reservoir pressure break produces induction additional stress, the horizontal stress difference near crack is 0.2-3.6MPa, is beneficial to split Seam direction changes, and produces seam net;
Step 4) on-the-spot crack test evaluation;
Being monitored in real time by down-hole microseism, evaluate seam net feature, it is complex that conclusion is that compact reservoir volume fracturing can produce Seam net system, form large range of transformation volume basis by volume fracturing;
The seam net characteristic synthetic that each step described is formed evaluates basis, it is achieved during compact reservoir pressure break, and hydraulic fracture is met natural Intrinsic fracture can be relatively easily opened in crack, forms the network system of man-made fracture and intrinsic fracture.
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 1, its feature exists In, described 2, set up fine and close oil volume productivity of fractured prognosis modelling model method;Be by specific well pattern under the conditions of, horizontal well body Overstock and split the transformation volume impact on recovery percent of reserves, Optimizing Reconstruction volume, and optimum level well volume fracturing cloth seam mode, seam net Bandwidth, band slit network parameters;Described method at least includes: step 1) transformation volume optimization;Step 2) cloth seam method optimizing;Step 3) seam network parameters optimization;Step 4) test of on-the-spot crack.
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 2, its feature exists In, described
Step 1) transformation volume optimization;In conjunction with compact reservoir feature, set up volume fracturing capability forecasting analogue model, according to difference Well pattern condition, the different transformation volume impact on recovery percent of reserves, Optimizing Reconstruction volume;Set up seam net double medium model;
Theoretical model includes below equation:
(1) flow equation:
V ‾ m = - K m μ gradP m
In formula (1):
V represents that percolation flow velocity, K represent that permeability, P represent that pressure, μ represent fluid viscosity;
(2) state equation:
ρ=ρo exp(1+CLP)
In formula (2):
ρ represents that fluid density, C represent that coefficient of compressibility, P represent pressure;
(3) equation of continuity:
φ m C m ∂ P m ∂ t - k m μ d i v ( gradP m ) + αK f μ ( P m - P f ) = 0
In formula (3):
φ represents that porosity, C represent that coefficient of compressibility, P represent that pressure, K represent that permeability, μ represent that fluid viscosity, α are and rock Specific surface, pore structure relevant, represent fissured rock feature parameter;
Subscript m represents the parameter of substrate (matrix), and subscript f represents the parameter of crack (fracture).
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 3, its feature exists In, the described canonical parameter setting up seam net double medium model: oil reservoir porosity φ is 9%, and reservoir permeability K is 0.1- 0.3mD, in the middle part of oil reservoir, original formation pressure P is 16-18MP, and pressure coefficient is 0.75-0.85, and underground viscosity of crude μ is 0.7- 0.8mPa.s, original dissolving oil-gas ratio 75.7m3/ t, oil compressibility C are 14-16 × 10-4/MPa。
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 2, its feature exists In, described step 2) cloth seam method optimizing;According to the numerical model set up under optimum transformation volume, exploit not for natural energy The impact on recovery percent of reserves of the same horizontal well volume fracturing under well pattern form, bonding crack net length, width parameter are to yield Impact, selects different cloth seam mode, optimizes and form a) alternating expression cloth seam mode;B) dumbbell type interlock cloth seam mode.
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 5, its feature exists In, described a) alternating expression cloth seam mode is to form alternating expression cloth seam mode for natural energy well net optimization;For natural energy Well pattern is produced multiple cracking by artificial fracturing, then carries out pressure break knitmesh;Adjacent horizontal direction upper and lower n-layer substrate rock mass (2) between adjacent vertical direction Fracture System (3), all form alternating expression cloth crack structure, constitute the seam net system of many seams.
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 5, its feature exists Interlock cloth seam mode in, described b) dumbbell type;Between adjacent vertical direction Fracture System (3), it is positioned at adjacent horizontal direction Up and down the middle part of n-layer substrate rock mass (2) forms dumbbell type and interlocks cloth crack structure, constitutes the seam net system of many seams.
8. optimize the method that fine and close profit horizontal well stitches network parameters, its feature according to the transformation volume that uses described in Claims 2 or 3 It is, described step 3) seam network parameters optimization;Under optimum transformation volume, according to different seam guipure length, bandwidth, pressure break hop count Impact on recovery percent of reserves, is separately optimized seam guipure length, bandwidth seam network parameters, is formed and folds according to transformation volume optimization seam network parameters The method added;Described a) alternating expression cloth seam mode and b) dumbbell type interlock cloth seam mode, uses crack and horizontal well time vertical Productivity Formulae (1) flow equation, (2) state equation, (3) equation of continuity simultaneous solution prediction low permeability oil field frac water horizontal well Yield;For alternating share, by improving scope of construction item, it is 500m including liquid measure3Above, discharge capacity is 6m3/ more than min, it is thus achieved that The seam net Overlay optimized.
The method using transformation volume to optimize fine and close profit horizontal well seam network parameters the most according to claim 2, its feature exists In, described step 4) test of on-the-spot crack;By the transformation volume target formed in study area densification oil reservoir, optimize seam net ginseng Number, forms substrate to crack beeline seepage flow.
CN201310286976.5A 2013-07-09 2013-07-09 A kind of method using transformation volume to optimize fine and close profit horizontal well seam network parameters Active CN104278980B (en)

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