CN105275446B - A kind of volume fracturing remodeling method - Google Patents
A kind of volume fracturing remodeling method Download PDFInfo
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- CN105275446B CN105275446B CN201410307279.8A CN201410307279A CN105275446B CN 105275446 B CN105275446 B CN 105275446B CN 201410307279 A CN201410307279 A CN 201410307279A CN 105275446 B CN105275446 B CN 105275446B
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Abstract
The invention discloses volume fracturing remodeling method, and it includes：Inject low viscous fracturing liquid, so that the microcrack of near wellbore formation by the low viscous fracturing liquid saturation of leak-off, reinjects the mulling fracturing fluid comprising small particle proppant, bending friction is reduced for blocking microcrack and polishing, to reduce near-wellbore effect, it is ensured that form main force's crack predominant pathway；It is alternately injecting into high viscosity fracturing fluid body and low viscous fracturing liquid, the remote well stratum constantly extension and extension in near wellbore formation of major fracture caused by making, connected with far field intrinsic fracture and plane of weakness stratification seam and reach expected length, also inject the mulling fracturing fluid comprising medium grain size proppant therebetween to support major fracture；Mulling fracturing fluid of the injection comprising big particle diameter proppant is supported with completing sealing.This method by injecting the fracturing fluid systems of different viscosities in an alternating fashion in hydraulic fracturing process, using and lift net pressure action effect, induced stress action effect and viscous fingering effect etc. and improve the connectedness of major fracture and intrinsic fracture and secondary branch fractures to reach, strengthen the purpose of the swept volume of hydraulic fracture.
Description
Technical field
The present invention relates to oil-gas exploration technical field, more particularly to one kind can strengthen the implementation of fragility shale gas reservoir fracturing
The volume fracturing remodeling method of effect.
Background technology
Shale gas reservoir has the features such as porosity, permeability are ultralow, and gas occurrence status are various, generally requires by water
Cost-effective exploitation could be obtained after splitting reservoir reconstruction measure by forcing.At present, volume fracturing is that shale gas reservoir reconstruction is commonly used
A kind of process.Modernization overlay can be carried out to reservoir on length three-dimensional by this method, increase reservoir
Seepage area and flow conductivity.Specifically, by changing perforating modes, pressure break scale, pressure in hydraulic fracturing implementation process
The methods of splitting material and injection mode increases the complexity of fracturing fracture, form one or more of major fractures while,
Allow major fracture to link up more intrinsic fractures or rock bedding and secondary fracture as far as possible, so as to realize man-made fracture with it is natural
The interlaced fracture network in crack, and then increase the effect of shale gas-bearing formation transformation volume.
In practical application, volume fracturing transformation would generally be related to following process：Improve discharge capacity construction, increase pressure break
Scale, slippery water, which mix pressure break, forced closed with linear glue ,+the quick row of returning+repeatedly adds sand technique, using low-viscosity fracturing fluid and
Small particle proppant etc..But actual monitoring data shows, above-mentioned process in actual applications can be by shale gas reservoir
The limitation of lithology, physical property, rock mechanics condition, expected network fracture feature can not be presented by actually pressing off crack.Particularly pair
In fragility is strong, intrinsic fracture development, level two to for the small shale formation of crustal stress difference, even if foring complex fracture,
Also it is limited only to around nearly pit shaft, it is relatively low that fracturing fluid makes seam efficiency, it is impossible to effectively achieve increase shale gas reservoir transformation volume
Purpose.In addition, can cause in slippery water takes sand fracturing process because of more seam leak-offs, major fracture slit width is narrow, fracturing fluid makes seam effect
Fruit is poor, major fracture flow conductivity is low, and adds many problems such as sand difficulty in work progress.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of volume fracturing remodeling method, pass through Optimizing construction infusion
Process, effective volume crack is formed in the earth formation, reaches desired fracturing effect.
A kind of volume fracturing remodeling method, comprises the following steps：
Initial crack initiation step, injects low viscous fracturing liquid so that the microcrack of near wellbore formation is by the low viscous fracturing fluid of leak-off
Body saturation, the mulling fracturing fluid comprising small particle proppant is reinjected, bending friction is reduced for blocking microcrack and polishing, with
Reduce near-wellbore effect；
Pressure break expands seam step, is alternately injecting into high viscosity fracturing fluid body and low viscous fracturing liquid, make caused by major fracture near
The remote well stratum constantly extension and extension in of well stratum, connected with far field intrinsic fracture and plane of weakness stratification seam and reach expected length
Degree, the mulling fracturing fluid comprising medium grain size proppant is also injected therebetween to support major fracture；
Sealing supports step, and mulling fracturing fluid of the injection comprising big particle diameter proppant is supported with completing sealing.
According to an embodiment of the invention, pre-treatment step, the sealing support are also included before above-mentioned initial crack initiation step
Also include stewing well after step and return row's step：
Pre-treatment step, acid solution is injected to clear up pit shaft and reduce the fracture pressure of Kong Zhaoxia and near wellbore formation；
Stewing well returns row's step, boils in a covered pot over a slow fire well for a period of time, the row of returning is controlled after fracture network is able to effectively fill and support.
According to an embodiment of the invention, above-mentioned high viscosity fracturing fluid body differs several times with the viscosity of low viscous fracturing liquid, with
Produce viscous fingering effect.
According to an embodiment of the invention, above-mentioned initial crack initiation step further comprises following small step：
Low viscous fracturing liquid is injected with relatively low discharge capacity；
Mulling fracturing fluid and net liquid body comprising small particle proppant alternately and repeatedly are injected with higher discharge capacity, make this mixed
The sand ratio of sand fracturing fluid stepwise rises.
According to an embodiment of the invention, above-mentioned pressure break expansion seam step further comprises following small step：
When the extended distance of major fracture reaches the first designated length, high viscosity fracturing fluid body is injected with higher discharge capacity；
When the extended distance of major fracture reaches the second designated length, stop injection high viscosity fracturing fluid body, use instead relatively low
Discharge capacity injects low viscous fracturing liquid, therebetween after operation pressure smooth decreasing, then is injected with higher discharge capacity and includes small particle branch
The mulling fracturing fluid of agent is supportted, is then injected into insulating liquid；
When the extended distance of major fracture reaches three designated lengths, higher discharge capacity injection high viscosity fracturing fluid body is used instead,
Therebetween after operation pressure smooth decreasing, then the mulling for including medium grain size proppant alternately and repeatedly is injected with higher discharge capacity
Fracturing fluid and net liquid body, the sand ratio of the mulling fracturing fluid is set stepwise to increase.
According to an embodiment of the invention, above-mentioned sealing return row step further comprise following small step：
When the extended distance of major fracture is close to major fracture desired length, uses higher discharge capacity instead and inject low viscous fracturing fluid
Body, the mixing fracturing fluid comprising big particle diameter proppant is then injected into complete sealing support；
After to be achieved desired plus sand concentration, displacement fluid is injected to replace the mixing fracturing fluid for including big particle diameter proppant.
Preferably, above-mentioned low viscous fracturing liquid is slippery water；The high viscosity fracturing fluid body is frozen glue；The mulling fracturing fluid
It is to be formed in corresponding construction procedure by the mixed with proppants of slippery water or frozen glue and corresponding particle diameter；The net liquid body and displacement fluid are
Slippery water or frozen glue；The insulating liquid is slippery water.
According to an embodiment of the invention, in above-mentioned initial crack initiation step, alternately and repeatedly injected and included with higher discharge capacity
The mulling fracturing fluid and net liquid body of small particle proppant, make the sand of the mulling fracturing fluid than can be by 2% with 1% amplification ladder
Rise to 4%~5% likes；
The pressure break expands in seam step, and the mulling for including medium grain size proppant alternately and repeatedly is injected with higher discharge capacity
Fracturing fluid and net liquid body, make the sand of the mulling fracturing fluid than can stepwise be risen to 2% amplification by 8%~10%
18%~20%.
According to an embodiment of the invention, above-mentioned relatively low discharge capacity can be 6~8m3/ min, the higher discharge capacity can be with
It is 10~12m3/ min, the higher discharge capacity can be 12~14m3/min。
According to an embodiment of the invention, the particle diameter of above-mentioned small particle proppant can be 100 mesh, the medium grain size support
The particle diameter of agent can be 40~70 mesh, and the particle diameter of the big particle diameter proppant can be 30~50 mesh.
Compared with prior art, the present invention has advantages below：
Volume fracturing remodeling method proposed by the present invention by adjusting pressure break infusion process in real time in hydraulic fracturing process
And the fracturing fluid system of construction parameter, in an alternating fashion injection different viscosities, utilization simultaneously lift net pressure action effect, induction
Stress effect and viscous fingering effect etc. improve major fracture and remote well stratum intrinsic fracture and secondary branch fractures
Connectedness, strengthen the swept volume of hydraulic fracture, so as to reach the mesh for improving the initil output of shale gas individual well and ultimate recovery
's.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and obtained in claim and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be provided commonly for explaining the present invention, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 shows a kind of flow chart of embodiment of volume fracturing remodeling method proposed by the present invention；
Fig. 2 shows the formation volume fracturing fracture extension in the embodiment of the present invention and the schematic diagram of extension situation.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with accompanying drawing further
Ground describes in detail.Fig. 1 shows a kind of flow chart of embodiment of volume fracturing remodeling method proposed by the present invention.From Fig. 1
Understand, this method mainly includes the following steps that：
Pre-treatment step, acid solution is injected to clear up pit shaft and reduce the fracture pressure of Kong Zhaoxia and near wellbore formation；
Initial crack initiation step, injects low viscous fracturing liquid so that the microcrack of near wellbore formation is by the low viscous fracturing fluid of leak-off
Body saturation, the mulling fracturing fluid comprising small particle proppant is reinjected, bending friction is reduced for blocking microcrack and polishing, with
Reduce near-wellbore effect；
Pressure break expands seam step, is alternately injecting into high viscosity fracturing fluid body and low viscous press liquid, makes caused major fracture from nearly well
Stratum remote well stratum constantly extension and extension in, connected with far field intrinsic fracture and plane of weakness stratification seam and reach expected length
Degree, the mulling fracturing fluid comprising medium grain size proppant is also injected therebetween to support major fracture；
Sealing supports step, and mulling fracturing fluid of the injection comprising big particle diameter proppant is supported with completing sealing.
Stewing well returns row's step, boils in a covered pot over a slow fire well for a period of time, the row of returning is controlled after fracture network is able to effectively fill and support.
It should be noted that the flow chart that Fig. 1 is shown is only used for explaining the present invention, but it is not construed as limiting the invention.
The workflow of the volume fracturing remodeling method of the present invention is explained with reference to the embodiment shown in Fig. 2.
1) pretreatment stage：
15% hydrochloric acid of 1/5 times of wellbore volume is initially injected, to clear up pit shaft and reduce Kong Zhaoxia and near wellbore formation
Fracture pressure.After acid filling terminates, with 2m3/ min discharge capacity injects low viscous slippery water, and acid solution is replaced to preforation tunnel position
Put.Wherein, after the acid solution amount for having 2/3 enters preforation tunnel and stratum, acid solution discharge capacity need to be promoted to rapidly 4~6m3/ min,
So that acid solution enters multi-openings eyelet as much as possible, it is ensured that effectively clears up preforation tunnel, avoids the drilling well of residual in pit shaft
Mud blocks preforation tunnel.
2) the initial crack initiation stage：
After acid solution to be cleaned is completely into stratum, low viscous slippery water is injected with certain discharge capacity, so that near wellbore formation
In the advance saturation in inside one for the microcrack (such as secondary fracture 1 and intrinsic fracture 3 in Fig. 2) that the initial crack initiation stage is formed
Divide low viscous slippery water.The present invention proposes that can calculate intrinsic fracture according to formula below (1) opens critical net pressure, then by
The corresponding relation that existing fracture simulation software is established between slippery water discharge capacity and crack net pressure, and determine slippery water discharge capacity
Lower limit.
In above formula, Pnf,netIt is that intrinsic fracture opens critical net pressure, unit MPa；
σH,maxIt is horizontal maximum principal stress, unit MPa；
σh,minIt is horizontal minimum principal stress, unit MPa；
υ is Poisson's ratio, dimensionless.
But, can also be with 6~8m in practical operation3The low stick-slip of/min 1.5~2 times of wellbore volumes of discharge capacity infusion is slipped
Water.Wherein, the viscosity of low viscous slippery water can be 3~5cp, and the viscosity of certain slippery water can also be adjusted suitably as the case may be
It is whole.Then again with 10~12m32% sand of/min about 1 times of wellbore volume of discharge capacity infusion than mulling fracturing fluid (hereinafter referred to as
Mulling liquid).The mulling liquid is formed by the mixed with proppants that low viscous slippery water and particle diameter are about 100 mesh, certain proppant particle diameter
Size can also suitably adjust as the case may be.Then reinject the low viscous slippery water of 0.5~1 times of wellbore volume.So
Alternately and repeatedly injected 3~5 times in a manner of one section of mulling liquid, one section of net liquid body (the preferred slippery water of net liquid body herein), until should
The sand of mulling liquid from 2% with 1% amplification than stepwise rising to 4%~6%.
In aforesaid operations step, the initial sand of mulling liquid is an important parameter than 2%.The present inventor according to
Many experiments are drawn, mulling liquid is mixed into using small particle proppant and the low viscous slippery water of such as 100 mesh, and by mulling liquid
Initial sand ratio is arranged to 2%, is promoted to 4%~6% afterwards with 1% amplification, best the effect of performance, can make fragility shale
The abundant saturation of slippery water that the intrinsic fracture (such as intrinsic fracture 3 in Fig. 2) of near wellbore formation is fallen by leak-off, and by small particle
Proppant effectively blocks, thus it is coextensive with major fracture (such as major fracture 8 in Fig. 2) within the specific limits, effectively subtract
Few near-wellbore effect, it is ensured that form main force's crack predominant pathway.
3) pressure break expands the seam stage：
In this stage, the fracturing fluid system of different viscosities is mainly alternately injecting into, to lift crack net pressure, increase seam
Width, caused by fracture extension path microcrack or the fracturing fluid leak caused by secondary fracture are reduced, effectively lifting pressure
Split the efficiency that hydraulic pressure makes major fracture, it is ensured that the seam length of major fracture.Wherein emphasis is the reasonable pressure for determining alternately to inject different viscosities
Split the opportunity of liquid (hereinafter referred changes the opportunity of note fracturing fluid).Due in practical operation, it usually needs split according to the master of monitoring
The extension situation of seam judges to change the opportunity of note fracturing fluid, therefore the present invention proposes that calculating induced stress according to formula below (2) has
Operating distance 2r is imitated, wherein r is the distance between fracture surface any point and well, then by existing fracture simulation software
Simulate major fracture half length the time between corresponding relation, so that it is determined that change note fracturing fluid so that lifted discharge capacity it is reasonable when
Machine.Wherein it should be noted that to ensure the instantaneous seam length of major fracture within induced stress effective range.
And in formula (2), each parameter meets following relation：
In formula (2) and formula (3), p is the pressure on fracture surface, unit Pa；σX, y, z are inducedIt is the induction on x, y, z direction
Stress, unit Pa；τX, z are inducedIt is the inducing shear stress in xz planes, unit Pa；R is fracture surface any point and well
The distance between, unit m；θ is fracture azimuth, and unit is degree；H is fracture height, c=H/2, unit m.
Wherein if θ, θ1And θ2It is negative value, then+180 ° of θ, θ should be used respectively1+ 180 ° and θ2+ 180 ° replace.
The size of crack-induced stress can be calculated by above formula, wherein it is concluded that：Induced stress size is with to crack
Identity distance reduces from increase, and maximum perpendicular to the horizontal stress that fractuer direction is induced, and is induced in fractuer direction
Horizontal stress is minimum.
Caused hydraulic fracture generates induced stress in the earth formation, the additional induced stress on original stress.
Because the induced stress added perpendicular to fractuer direction is big, the induced stress added in fractuer direction is small, hence in so that originally
Minimum horizontal principal stress be possible to be more than original maximum horizontal principal stress, so as to change former stress state.But with
The increase of crack distance, induced stress reduces rapidly, and after the certain distance of crack, stress field is still original state.
In the embodiment shown in Figure 2, specified when the major fracture extended distance that the initial crack initiation stage is formed reaches first
During length, namely crack forward position 4 shown in Fig. 2 reaches major fracture and it is expected half long Lf5/20 at when, stop infusion, allow and have been injected into
Particle diameter settle and lay in crack for the proppants of 100 mesh, the initial crack initiation stage terminates.Stopping 10~15min of infusion
Afterwards, start to use frozen glue progress infusion construction instead, the viscosity of frozen glue can be 200~300cp, and the discharge capacity of frozen glue is promoted to
10~12m3/ min, to lift net pressure inside crack, make major fracture feature caused by stratum more obvious.Need what is illustrated
It is, in order to which the later stage makes full use of the viscous fingering effect of different viscosities fracturing liquid to extend major fracture, in the present embodiment, to make
Viscosity for the frozen glue of high viscosity fracturing fluid body differs 60 times with the viscosity of the slippery water as low viscous fracturing liquid.
The half long corresponding relation between the time of major fracture simulated with reference to fracture simulation software, when major fracture extended distance
When reaching the second designated length, namely crack forward position 5 shown in Fig. 2 reaches major fracture and it is expected half long Lf8/20 at when, stop
Frozen glue is injected, is changed to 3~5cp of infusion slippery water, and the discharge capacity of slippery water is reduced to 6~8m3/min.As it was previously stated, work as
When the viscosity of two kinds of liquid differs 60 times, low viscosity liquid is easy to break through high viscosity liquid generation fingering.Therefore the present invention proposes
Major fracture is extended using slippery water viscous fingering effect.That is, low viscous slippery water is before major fracture internal flow and breaking through
Frozen glue and the end for reaching major fracture so that major fracture wall occurs leak-off and continues to prolong to orientation of principal stress extension
Stretch, at the same slippery water can also to unlatching or the intrinsic fracture leak-off opened induced by net pressure so that in remote well stratum it is natural
Crack is also expanded and a range of extension.At this stage, major fracture and intrinsic fracture produce competition, major fracture and
Branch fractures are linked up each other.
With 6~8m3/ min discharge capacity is stably during the low viscous slippery water of infusion, if operation pressure has significantly
Fall after rising, then show branch fractures or induce the complicated microcrack opened to be linked up by major fracture by net pressure.Pressure to be onstructed
Power is dropped in 2~3min after a stable pressure value, with 10~12m3/ min discharge capacity injects 0.5~1 times of wellbore volume
Mulling liquid.The mulling liquid is also to be made up of low viscous slippery water and particle size for the proppant of 100 mesh, and sand ratio is 2%~
4%.Then reinject the low viscous slippery water of 1~1.2 times of wellbore volume so that mulling liquid and the jelly liquid that will inject below every
From.
The half long corresponding relation between the time of major fracture simulated with reference to fracture simulation software, when major fracture extended distance
When reaching three designated lengths, namely crack forward position 6 shown in Fig. 2 reaches major fracture and it is expected half long Lf10/20 at when, again
200~300cp of injection frozen glue is changed to, and the discharge capacity of frozen glue is maintained at 10~12m3/min.Due to low viscous in major fracture
Slippery water because viscous fingering effect surmounted before injection frozen glue, therefore the frozen glue newly injected displacement by piston type it
The frozen glue of preceding injection, the frozen glue with stylish injection also make the sand dune that is formed by slippery water sand fallout be promoted to crack deep, so as to
Major fracture is promoted further to extend.It is similar with preceding step, when operation pressure drops to a smooth pressure value, it is changed to infusion and mixes
Sand liquid, mulling liquid now is formed by slippery water and particle size for the mixed with proppants of 40~70 mesh, and the mulling liquid is first
Beginning sand ratio is 8%~10%, then anti-in the way of one section of mulling liquid, one section of net liquid body (the preferred slippery water of net liquid body herein)
Complex Alternating injects, and makes the sand of the mulling liquid than stepwise being improved to 18%~20%, to support major fracture with 2% amplification.
It suitably can certainly increase or reduce most high sand ratio according to actual plus sand complexity.If in addition, practice of construction process
The middle situation for occurring adding sand difficult, can also use frozen glue instead and take sand, to support major fracture.
The half long corresponding relation between the time of major fracture simulated with reference to fracture simulation software, when major fracture extended distance
During close to major fracture desired length, such as crack forward position 7 shown in Fig. 2 reaches major fracture and it is expected half long Lf18/20 at when, then
The secondary slippery water for being changed to 3~5cp of infusion, and the discharge capacity of slippery water is reduced to 6~8m3/min.Now because far field induction should
Power declines, net pressure is limited in major fracture, can not be then turned on intrinsic fracture or induction major fracture turns to, therefore in slippery water
Major fracture will continue to extend forward in the presence of viscous fingering effect.
4) sealing driving phase：
After the slippery water of 1~1.2 times of wellbore volume of lasting injection, gradually by the discharge capacity of slippery water from 6~8m3/ min is carried
Rise to 12~14m3/ min, then persistently inject the slippery water of 1 times of wellbore volume.Infusion mulling liquid, mulling now are changed to afterwards
Liquid is to be formed by slippery water and particle size for the mixed with proppants of 30~50 mesh.According to the sand ratio of design, such as：16%~
18%, mulling liquid is persistently injected to complete the addition of big particle diameter proppant, for supporting sealing and lifting leading for crack arrival end
Stream ability.Certainly, this big particle diameter proppant can also use frozen glue instead and carry to shaft bottom, sand ratio and can also be become according to practice of construction pressure
Change situation suitably increases or reduced.After the completion of sand task is added, injection is about the frozen glue of 1/5~1/4 wellbore volume to replace
The mulling liquid of most latter end.The slippery water finally re-injected not less than 1 times of wellbore volume is completed to replace, accordingly even when viscosity occurs
Fingering effect, also ensure that mulling liquid energy is enough completely into crack, the presence of mulling liquid is not had in pit shaft.Can certainly basis
Practice of construction pressure changing suitably increases replacement liquid measure.
5) boil in a covered pot over a slow fire well and return row's stage：
After termination of pumping boils in a covered pot over a slow fire well for a period of time, such as 30~60min, certain this time can also fall situation after rise according to actual pressure
Suitably increase or shorten, fracture network is fully extended, and crack arrival end be supported agent effective filling and
After support, then it is controlled the row of returning.
It is described above, it is only the specific implementation case of the present invention, protection scope of the present invention is not limited thereto, any ripe
Those skilled in the art are known in technical specification of the present invention, modifications of the present invention or replacement all should be in the present invention
Protection domain within.
Claims (9)
1. a kind of volume fracturing remodeling method, comprises the following steps：
Initial crack initiation step, injects low viscous fracturing liquid so that the microcrack of near wellbore formation is satisfied by the low viscous fracturing liquid of leak-off
With, reinject the mulling fracturing fluid comprising small particle proppant, for block microcrack and polishing reduce bending friction, with reduce
Near-wellbore effect；
Pressure break expands seam step, is alternately injecting into high viscosity fracturing fluid body and low viscous fracturing liquid, makes caused major fracture from nearly well
Layer remote well stratum constantly extension and extension in, connected with far field intrinsic fracture and plane of weakness stratification seam and reach expected length,
The mulling fracturing fluid comprising medium grain size proppant is also injected therebetween to support major fracture；
Sealing supports step, and mulling fracturing fluid of the injection comprising big particle diameter proppant is supported with completing sealing；
The pressure break expands seam step and further comprises following small step：
When the extended distance of major fracture reaches the first designated length, after termination of pumping 10-15min, then it is high with higher discharge capacity injection
Viscous fracturing liquid；
When the extended distance of major fracture reaches the second designated length, stop injection high viscosity fracturing fluid body, use relatively low discharge capacity instead
Low viscous fracturing liquid is injected, therebetween after operation pressure smooth decreasing, then is injected with higher discharge capacity and includes small particle proppant
Mulling fracturing fluid, be then injected into insulating liquid；
When the extended distance of major fracture reaches three designated lengths, higher discharge capacity injection high viscosity fracturing fluid body is used instead, therebetween
The mulling pressure break comprising medium grain size proppant alternately and repeatedly is injected after operation pressure smooth decreasing, then with higher discharge capacity
Liquid and net liquid body, the sand ratio of the mulling fracturing fluid is set stepwise to increase.
2. volume fracturing remodeling method as claimed in claim 1, it is characterised in that also include before the initial crack initiation step
Pre-treatment step, the sealing support step also include stewing well and return row's step afterwards：
Pre-treatment step, acid solution is injected to clear up pit shaft and reduce the fracture pressure of Kong Zhaoxia and near wellbore formation；
Stewing well returns row's step, boils in a covered pot over a slow fire well for a period of time, the row of returning is controlled after fracture network is able to effectively fill and support.
3. volume fracturing remodeling method as claimed in claim 1, it is characterised in that：
The high viscosity fracturing fluid body differs several times with the viscosity of low viscous fracturing liquid, to produce viscous fingering effect.
4. the volume fracturing remodeling method as described in claims 1 to 3 any one, it is characterised in that the initial crack initiation step
Suddenly following small step is further comprised：
Low viscous fracturing liquid is injected with relatively low discharge capacity；
Mulling fracturing fluid and net liquid body comprising small particle proppant alternately and repeatedly are injected with higher discharge capacity, make the mulling pressure
The sand ratio for splitting liquid stepwise rises.
5. volume fracturing remodeling method as claimed in claim 4, it is characterised in that the sealing returns row's step and further comprised
Small step below：
When the extended distance of major fracture is close to major fracture desired length, uses higher discharge capacity instead and inject low viscous fracturing liquid, so
Mixing fracturing fluid of the injection comprising big particle diameter proppant is supported with completing sealing afterwards；
After to be achieved desired plus sand concentration, displacement fluid is injected to replace the mixing fracturing fluid for including big particle diameter proppant.
6. volume fracturing remodeling method as claimed in claim 5, it is characterised in that：
The low viscous fracturing liquid is slippery water；The high viscosity fracturing fluid body is frozen glue；The mulling fracturing fluid is accordingly to construct
Formed in step by the mixed with proppants of slippery water or frozen glue and corresponding particle diameter；The net liquid body and displacement fluid are slippery water or jelly
Glue；The insulating liquid is slippery water.
7. volume fracturing remodeling method as claimed in claim 5, it is characterised in that further：
In the initial crack initiation step, the mulling fracturing fluid comprising small particle proppant alternately and repeatedly is injected with higher discharge capacity
With net liquid body, make the sand of the mulling fracturing fluid than stepwise rising to 4%~5% by 2% with 1% amplification；
The pressure break expands in seam step, alternately and repeatedly injects the mulling pressure break comprising medium grain size proppant with higher discharge capacity
Liquid and net liquid body, make the sand of the mulling fracturing fluid than stepwise rise to 18% by 8%~10% with 2% amplification~
20%.
8. volume fracturing remodeling method as claimed in claim 5, it is characterised in that：
The relatively low discharge capacity is 6~8m3/ min, the higher discharge capacity are 10~12m3/ min, the higher discharge capacity are 12
~14m3/min。
9. the volume fracturing remodeling method as described in claim 5 or 6, it is characterised in that：
The particle diameter of the small particle proppant is 100 mesh, and the particle diameter of the medium grain size proppant is 40~70 mesh, the big grain
The particle diameter of footpath proppant is 30~50 mesh.
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