CN107524432A - A kind of real-time parameter adjustment method in pressing crack construction - Google Patents
A kind of real-time parameter adjustment method in pressing crack construction Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 92
- 238000003825 pressing Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 31
- 230000008859 change Effects 0.000 claims abstract description 28
- 241000208340 Araliaceae Species 0.000 claims abstract description 25
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims abstract description 25
- 235000003140 Panax quinquefolius Nutrition 0.000 claims abstract description 25
- 235000008434 ginseng Nutrition 0.000 claims abstract description 25
- 238000011161 development Methods 0.000 claims abstract description 6
- 238000010223 real-time analysis Methods 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 60
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 19
- 238000013461 design Methods 0.000 claims description 16
- 230000010355 oscillation Effects 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 12
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- 238000004458 analytical method Methods 0.000 abstract description 6
- 206010017076 Fracture Diseases 0.000 description 68
- 208000010392 Bone Fractures Diseases 0.000 description 61
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention discloses the real-time parameter adjustment method in a kind of pressing crack construction.Method includes：(1) conventional reservoir is evaluated；(2) prepad fluid mini-frac：(3) during fracture extension crucial reservoir characteristic parameter real-time analysis：Real-time tune ginseng in intrinsic fracture parameter, the development density for calculating intrinsic fracture, three-dimensional stress analysis, (4) pressing crack construction；Real-time tune ginseng when real-time tune ginseng, the C three-dimensional stresses of real-time tune ginseng, the change of B overall fluid loss coefficients when A intrinsic fractures characterisitic parameter changes change.The present invention solves the problems, such as that conventional construction parameter adjustment relies primarily on workmen's experience, to analyzing reservoir characteristic and construction dynamic in field operation in time, Reasonable adjustment construction parameter, optimizes fracture pattern, smoothly completing pressing crack construction has important directive significance.
Description
Technical field
The present invention relates to field of petroleum exploitation, further says, is the real-time parameter adjustment method being related in a kind of pressing crack construction.
Background technology
In hydraulic fracturing construction, strictly it can be constructed under normal circumstances by pressure break design parameter, by setting for optimization
Meter is converted into the construction of optimization, effect of increasing production expected from acquirement.Anisotropism and intrinsic fracture development yet with reservoir
Degree is different, and the evaluation result before actual stratum characteristic and FRACTURING DESIGN might have larger difference.If continue by pre-
Fixed fracturing design program is constructed, it will occur fracture height it is super it is expected extend, fracture support section is unreasonable, early stage sand
The abnormal conditions such as stifled, so as to cause fracturing transformation effect bad or pressure after the underproduction situations such as.Therefore, it is necessary to the root in work progress
According to the situation of change of reservoir characteristic, construction parameter is adjusted in real time, Optimum Fracturing is constructed the crack to be formed.
Typically now it is the analysis that near wellbore zone reservoir characteristics are carried out by means such as well logging, well logging, core experiments, and it is right
In experience and the model shortcoming that reservoir characteristics are judged using fracturing parameter, especially frac pressure tracing analysis, easily lead
Cause reservoir parameter change in work progress not discover in time, miss the opportunity of adjustment fracturing parameter.Only lean on well head pressure
The change of power is difficult to the pressure change of accurate judgement underground, and the extension situation of fracture judges inaccurate, not in time.In addition, often
It is that the pressure-responsive model of rule is all based on single crack it is assumed that not being suitable for complex fracture extension shape caused by identifying volume fracturing
Condition.The adjustment of parameter relies primarily on the micro-judgment of workmen in pressing crack construction process, lacks computational accuracy, construction parameter
It is inadequate to adjust reliability.Such as well head pressure declines to a great extent, it may be possible to because fracture height is out of control, crack ditch leads to big tomography
Or caused by the change of crustal stress and the moment of injection string grind the different reasons such as leakage, reservoir geology situation and underground need to be combined
The comprehensive analysis and judgement such as the pressure check of tubing string.
In summary, it is necessary to propose that ginseng technology is adjusted in a kind of new hydraulic fracturing construction in real time, according to reservoir parameter in construction
Change, the form in Optimum Fracturing crack, and then obtain optimal pressing crack construction effect.
The content of the invention
To solve produced problem in the prior art, the invention provides the real-time parameter adjustment method in a kind of pressing crack construction.
The complexity and extension ability of fracturing fracture according to the change of reservoir parameter, Optimizing construction measure, can be improved, and then is obtained most
Good pressing crack construction effect.The present invention is applied to tight sand oil-gas reservoir and shale oil-gas reservoir.The present invention comments in the reservoir of routine
On the basis of valency, using curves such as the pressure in pressing crack construction data, discharge capacity, sand liquor ratios, the reservoir parameter in remote well area is carried out
Qualitative or quantitative analysis, so as to Reasonable adjustment construction parameter, optimize fracture pattern.Present invention, avoiding only rely on workmen
Micro-judgment carries out the risk of construction adjustment, so as to ensure that pressing crack construction is smoothed out.
It is an object of the invention to provide the real-time parameter adjustment method in a kind of pressing crack construction.
Including：
(1) conventional reservoir is evaluated；
(2) prepad fluid mini-frac
In the preceding 1/4-1/3 of pad of frac liquid measure or 30-40m3Prepad fluid carries out the construction of mini-frac；
(3) during fracture extension crucial reservoir characteristic parameter real-time analysis
Intrinsic fracture parameter：
When parameter stabilities such as discharge capacity, fluidity and sand liquor ratios, if there is the zigzag fluctuation characteristic of pressure, show crack
Intrinsic fracture is linked up during extension, each fluctuation represents and linked up an intrinsic fracture.When whole pressing crack constructions terminate,
According to the pressure-break length and pressure oscillation number calculated, can simple computation go out the development density of intrinsic fracture；
The amplitude for first calculating each pressure oscillation accounts for the ratio of average injection pressure when constructing at that time, the note of pressure oscillation
The angle of incidence, calculate discharge capacity and fluid volume for extending the stage intrinsic fracture；Results of fracture simulation software is finally recycled, finally
The physical dimension after all intrinsic fractures are extended can be calculated；
Overall fluid loss coefficient
2~3 instantaneous terminations of pumping, according to the termination of pumping pressure difference value of any two time, calculate overall fluid loss coefficient.
Three-dimensional stress is analyzed
Asked for using micro rupture measuring technology is layered, with pressure break liquid measure 2-3m3, i.e. closing well after gash fracture；
The difference of instantaneous characteristics twice in pressing crack construction, calculate the tensile strength of rock.In conjunction with most
Small horizontal principal stress result, calculates maximum horizontal principal stress；
(4) the real-time tune ginseng in pressing crack construction：
Real-time tune ginseng when A intrinsic fractures characterisitic parameter changes：
If a intrinsic fracture agensis, is continued by FRACTURING DESIGN；
If b intrinsic fractures are developed, and desirably form longer man-made fracture, before main pressing crack construction, increase sand liquor ratio,
Then the main pressing crack construction stage reduces sand liquor ratio；
If c intrinsic fractures are developed very much, powder pottery or flour sand sand liquor ratio will be improved, increases fracturing fluid viscosity, or the row of reduction
Amount, opened beneficial to substantial amounts of microcrack is avoided；
If d reservoir conditions suitably form complex fracture form, by injecting low glutinous fracturing fluid, injection rate is improved, is reduced
The sand liquor ratio of step；
It is preferred that：
If b intrinsic fractures are developed, and desirably form longer man-made fracture, before main pressing crack construction, increase sand liquor ratio
1-3% (proppant is made pottery for powder), the main pressing crack construction stage reduces sand liquor ratio 3-5% (proppant is haydite)；
If c intrinsic fractures are developed very much, powder pottery or flour sand sand liquor ratio are brought up into 3-7%, fracturing fluid viscosity increase 20-
30mPa.s, or 10-30% discharge capacities are reduced, opened beneficial to substantial amounts of microcrack is avoided；
If d reservoir conditions suitably form complex fracture form, by injecting low glutinous fracturing fluid, range of viscosities 2-3mPa.s,
Improve 5-10m3Injection rate, reduce the sand liquor ratio 1-2% of starting.
The real-time tune ginseng of B overall fluid loss coefficients change：
If the overall fluid loss coefficient amplitude of variation that the correspondence in a steps (3) is analyzed in real time is no more than 20%, former design is maintained
Preposition liquid measure and other parameters construction；
If b overall fluid loss coefficient height amplitudes of variation more than 20%, when leakoff coefficent change is big, increases preposition liquid measure, dropped
Low starting sand liquor ratio), it is on the contrary then be adjusted toward opposite direction；
It is preferred that：
If the change of overall fluid loss coefficient that the correspondence in a steps (3) is analyzed in real time be no more than 20% (reduce within 20% or
Within increase by 20%), maintain intrinsic preposition liquid measure and the construction of other parameters；
If b overall fluid loss coefficient height amplitudes of variation, more than 20%, when leakoff coefficent change is big, increase 10-20% is preposition
Liquid measure, 2-5% starting sand liquor ratios are reduced, when overall fluid loss coefficient change is small, then reduces the preposition liquid measures of 10-20%, increase 2-5%
Start to walk sand liquor ratio.
Real-time tune ginseng when C three-dimensional stresses change：
If a overlyings rock pressure (power suffered by stratum in vertical direction) is minimum value, show man-made fracture for level
Seam, now can termination of pumping 30-60min；
If b two is higher than FRACTURING DESIGN to horizontal stress difference, show that crack is big for the probability that single double-vane symmetrically stitches, increase is applied
Work sand liquor ratio；
If c reservoir conditions suitably form complex fracture form, increase the ratio of low glutinous fracturing fluid, increase small particle support
The ratio of agent, appropriate reduction construction sand liquor ratio, improve the complexity for forming crack.
It is preferred that：
If b two is higher than FRACTURING DESIGN to horizontal stress difference, shows that crack is big for the probability that single double-vane symmetrically stitches, increase 3-
5% construction sand liquor ratio；
If c reservoir conditions suitably form complex fracture form, the ratio of the low glutinous fracturing fluids of increase 5-15%, increase 10-
20% small particle proppant, 5-10% construction sand liquor ratios are reduced, improve the complexity for forming crack.
If the operation pressure rate of climb is too fast：(operation pressure generally with discharge capacity or add sand concentration increase and on
Rise；If discharge capacity adds sand concentration constant, it can typically keep stable)
1. rate of pressure rise<1MPa/min：Continue to construct by normal FRACTURING DESIGN program, now operation pressure rises only
Reflect the increase of crack resistance, do not occur the situation of TSOP fracturing also.Simultaneously, it is necessary to pay attention to well head pressure limiting, pressure window is avoided
It is narrow.
2. rate of pressure rise>1MPa/min：Now inside crack may sand plug, rate of pressure rise is faster, nearly well
The probability that sand plug occurs for crack is bigger；The amplitude risen according to operation pressure, construction sand liquor ratio (such as 10-20%) is reduced, or stopped
The only injection of proppant.
Wherein, preferably：
Step 2.,
The amplitude risen according to operation pressure, construction sand liquor ratio 10-20% is reduced, or stop the injection of proppant.
The present invention can specifically use following technical scheme：
(1) conventional reservoir is evaluated：The methods of by rock core laboratory experiment and surveying Well Log Interpretation, carries out conventional reservoir
Evaluation.With reference to the construction effect and geologic feature of reservoir nearby fractured well, the characteristics of analyzing reservoir and it is likely to occur in construction
The problem of.
(2) prepad fluid mini-frac：The pressure fall-off test time of general small scale fracturing test is relatively time-consuming in 60min or so
Arduously, and operating expenses need to be significantly increased.The present invention is at the preceding 1/4-1/3 of pad of frac or uses 30-40m3Prepad fluid
The construction of similar mini-frac is carried out, step liter capacity and step drop discharge capacity are all normally carried out, and test pressure drop time can be as short as 5-
10min, play the formal pressure break of pump immediately afterwards.This stage can simple computation go out the extending pressure in crack, nearly well crack tortuosity frictional resistance,
The parameter such as tensile strength of rock and overall fluid loss coefficient.
(3) during fracture extension crucial reservoir characteristic parameter real-time analysis：Prepad fluid test pressure in step (2)
Split reflection is only the formation characteristics in the range of nearly well, continue in follow-up crack extension during, it is necessary to according to link up stratum when
The pressure-responsive feature of generation determines whether the reservoir characteristics of remote well.The computational methods of each parameter in remote well stratum are as follows：
1. intrinsic fracture parameter：When parameter stabilities such as discharge capacity, fluidity and sand liquor ratios, if there is the Sawtooth waves of pressure
Dynamic feature, shows to have linked up intrinsic fracture during fracture extension, the time of pressure oscillation shows that intrinsic fracture is flared
Time.Pressure oscillation feature when injecting low glutinous fracturing fluid can become apparent from, because high viscosity liquid has viscous force effect
Should, the fluctuating range of pressure it is small and be difficult to reflection arrive well head.
The density of the frequency representative intrinsic fracture development of pressure oscillation, each fluctuation representative have been linked up one and naturally split
Seam.At the end of construction, according to the pressure-break length and pressure oscillation number calculated, can simple computation go out the development of intrinsic fracture
Density.
The fluctuating range of pressure should correspond to the original size of intrinsic fracture, and original fracture size is bigger, pressure fluctuations amplitude
It is bigger.First calculating the ratio of average injection pressure when the amplitude of each pressure oscillation accounts for construction at that time (should typically convert
Bottomhole injection pressure), it is the ratio that total injection rate is accounted for for extending the discharge capacity of the stage intrinsic fracture that can be approximately considered this.Then
According to the injection length of pressure oscillation, the discharge capacity and fluid volume for extending the stage intrinsic fracture are calculated.Finally recycle
Ripe results of fracture simulation software, the length after the stage intrinsic fracture is extended, width, height equivalence are simulated, can finally be counted
Calculate the physical dimension after all intrinsic fractures are extended.
2. overall fluid loss coefficient：2~3 instantaneous terminations of pumping, according to the termination of pumping pressure difference value of any two time, calculate synthesis
Leakoff coefficent.According to two adjacent termination of pumping calculation of pressure, overall fluid loss coefficient can be calculated with the difference of engineering time and
Different changes occurs.If taking first time termination of pumping pressure and last time termination of pumping pressure to be calculated, what is reflected is longer split
The average leakoff coefficent of (the fracture length scope can be analyzed with the results of fracture simulation software of maturation) in the range of seam.
3. three-dimensional stress is analyzed：Asked for using micro rupture measuring technology is layered, i.e., with the liquid measure such as 2-3m of very little3,
It is closing well after gash fracture.Now liquid displacement is small, and pit shaft frictional resistance can be neglected, caused by Fracture geometric size it is also minimum, therefore
Crack net pressure can be neglected, and the instantaneous characteristics of shaft bottom conversion can be approximately the minimum horizontal principal stress of this layer.
The difference of instantaneous characteristics twice in pressing crack construction, calculate the tensile strength of rock.In conjunction with most
Small horizontal principal stress result, it is convenient to calculate maximum horizontal principal stress, computational methods are as follows：
σmax=3 σmin-Pi-Pf+T
In formula：Pi- strata pressure, MPa
Pf- formation fracture pressure, MPa
σmax- maximum horizontal principal stress, MPa
σmin- minimum horizontal principal stress, MPa
The tensile strength of T-rock, MPa
(4) the real-time tune ginseng for (referring to the main pressing crack construction stage) in pressing crack construction：In the reservoir key characteristic parameter of step (3)
On the basis of Real-Time Evaluation, if parameter has large change with the reservoir parameter before FRACTURING DESIGN, construction parameter can be adjusted in real time, with
Ensure construction safety and best results.
Real-time tune ginseng when 1. intrinsic fracture characterisitic parameter changes：According to corresponding analysis in step (3), analysis is tied in real time
Fruit, if intrinsic fracture agensis, is continued by FRACTURING DESIGN.If intrinsic fracture is developed, and is desirably formed longer artificial
Crack, before main pressing crack construction, increase sand liquor ratio 1-3% (proppant is made pottery for powder), the main pressing crack construction stage reduces sand liquor ratio 3-
5% (proppant is haydite)；If intrinsic fracture is developed very much, (it is more that such as pressure fluctuations amplitude is more than appearance in 10MPa or one minute
Individual pressure oscillation), powder should be made pottery or flour sand sand liquor ratio brings up to 3-7% (even more high), it is appropriate to increase the (increase of fracturing fluid viscosity
20-30mPa.s), or suitably discharge capacity (according to total operational discharge capacity situation, 10-30% discharge capacities can be reduced) is reduced, it is big beneficial to avoiding
The microcrack of amount opens.
If reservoir conditions suitably form complex fracture form, can be improved by injecting low glutinous fracturing fluid (such as 2-3mPa.s)
Injection rate is (such as more injection 5-10m3), the measures such as the sand liquor ratio (1-2%) of starting are reduced, expand the expanded range of intrinsic fracture,
Improve the complexity degree in final crack and the effect of reservoir reconstruction.
2. the real-time tune ginseng of overall fluid loss coefficient change：If the overall fluid loss coefficient that the correspondence in step (3) is analyzed in real time
Change maintains intrinsic preposition liquid measure and the construction of other parameters less (such as fluctuation 20% up and down).If overall fluid loss coefficient is high
Low amplitude of variation then needs to carry out parameter adjustment in real time more than 20%.When leakoff coefficent change is big, it need to moderately increase preposition liquid measure
(such as increase 10-20%), reduces starting sand liquor ratio (as reduced 2-5%), on the contrary then be adjusted toward opposite direction.
Real-time tune ginseng when 3. three-dimensional stress changes：If overlying rock pressure is minimum value, show man-made fracture for level
Seam, now can termination of pumping 30-60min, simulated again by the design of horizontal joint, as early as possible adjust crack banding come series of parameters
Change.
If two is higher than FRACTURING DESIGN to horizontal stress difference, show that crack is big for the probability that single double-vane symmetrically stitches, now may be used
Appropriate increase construction sand liquor ratio (such as increasing 3-5% on the basis of original).If reservoir conditions suitably form complex fracture form,
The ratio (increasing 5-15% on the basis of original) of low glutinous fracturing fluid can be increased, increase the ratio of small particle proppant (original
On the basis of increase 10-20%), it is appropriate reduce construction sand liquor ratio (reducing 5-10%), improve the complexity for forming crack.
(5) operation pressure rises the tune ginseng under different situations：, can not be by step if the operation pressure rate of climb is too fast
(4) the real-time tune ginseng when three-dimensional stress in changes, need to be adjusted respectively by following two situations：
1. rate of pressure rise<1MPa/min：Continue to construct by normal FRACTURING DESIGN program, now operation pressure rises only
Reflect the increase of crack resistance, do not occur the situation of TSOP fracturing also.Simultaneously, it is necessary to pay attention to well head pressure limiting, pressure window is avoided
It is narrow.
2. rate of pressure rise>1MPa/min：Now inside crack may sand plug, rate of pressure rise is faster, nearly well
The probability that sand plug occurs for crack is bigger.The amplitude risen according to operation pressure, construction sand liquor ratio (such as 10-20%) is greatly reduced,
Or stop the injection of proppant.
Present invention adjustment of construction parameter in pressing crack construction, which proposes, systematically to be analyzed, and solves construction ginseng in the past
The problem of number adjustment relies primarily on workmen's experience, to analyzing reservoir characteristic and construction dynamic in field operation in time, rationally
Construction parameter is adjusted, optimizes fracture pattern, smoothly completing pressing crack construction has important directive significance.
Brief description of the drawings
Fig. 1 is the gas well fracturing construction curve figure of embodiment
Embodiment
With reference to embodiment, the present invention is further illustrated.
Embodiment：
(1) real-time tune ginseng when intrinsic fracture characterisitic parameter changes：
Certain shale gas well fracturing reform is constructed, and hydraulic fracture operating curve is as shown in Figure 1.
By method provided by the present invention, early stage is constructed using low-viscosity fracturing fluid (2-3mPa.s), is being constructed
During there is the zigzag fluctuation characteristic of pressure, show to have linked up intrinsic fracture during fracture extension.Due to naturally splitting
Seam is more developed, and construction sand liquor ratio 3% is reduced on the basis of original FRACTURING DESIGN, adds the powder pottery rank that sand liquor ratio is 5%
Section.Meanwhile in order to improve the complexity in crack, follow-up load fluid amount designs more injection 10m per the stage than original3, expand natural
The expanded range in crack.Phase after construction, in order to improve fracture width and add sand concentration, using high viscosity fracturing fluid
(100mPa.s) takes sand construction.Although reservoir intrinsic fracture is developed, this staged pressure fluctuating range is smaller, it was demonstrated that low mucus
Body is to pressure change and the sensitiveness of intrinsic fracture.In the whole construction stage, pressure oscillation frequency is 10, pressure fluctuations amplitude power
Between 6-8MPa, smaller pressure reduction of speed is that the remote well cracks of 1.68~4.97MPa/min are comparatively developed, intrinsic fracture
Distribution is big.
(2) the tune ginseng in the case of pressure rises
The present invention is applied in the construction of certain shale gas well fracturing reform.
By method provided by the present invention, early stage is constructed using low-viscosity fracturing fluid (2-3mPa.s).In discharge capacity
2 obvious ruptures, pressure 1.8~3.2MPa of the range of decrease occur for stratum during increased, and pressure reduction of speed is 1.79~
4.57MPa/min.The pressure range of decrease is larger after stratum ruptures, reduction of speed is very fast, illustrates that stratum fragility is good, intrinsic fracture is relatively sent out
Educate, stratum leakoff coefficent is 6.83 × 10-4m/min0.5.It is 3% He that 1st section and the 2nd section of proppant is changed to sand liquor ratio respectively
5% powder pottery.3rd section starts to construct using the conventional proppants of sand liquor ratio 4%.In the whole construction stage, pressure oscillation frequency
For 8, pressure fluctuations amplitude power is smaller between 1.6~4.7MPa, and smaller pressure reduction of speed is 0.33~2.14MPa/min, far
Well crack is relatively developed, and intrinsic fracture yardstick is smaller.First 12 sections of the operation pressure rate of climb is equal<1MPa/min, by design program
Perform.At the 12nd section, operation pressure rises rapidly, rate of pressure rise 2.12MPa/min, now by sand liquor ratio by originally setting
The 28% of meter is reduced to 18%, and discharge capacity is by 11m3/ min is reduced to 10m3/min.Now, the operation pressure rate of climb is still
1.97MPa/min, occur the sign of sand plug in crack, therefore stop the injection of proppant, terminate construction.
Claims (6)
1. the real-time parameter adjustment method in a kind of pressing crack construction, it is characterised in that methods described includes：
(1) conventional reservoir is evaluated；
(2) prepad fluid mini-frac：
The preceding 1/4-1/3 of pad of frac liquid measure or use 30-40m3Prepad fluid carries out the construction of mini-frac；
(3) during fracture extension crucial reservoir characteristic parameter real-time analysis：
Intrinsic fracture parameter：
When parameter stabilities such as discharge capacity, fluidity and sand liquor ratios, if there is the zigzag fluctuation characteristic of pressure, show fracture extension
During linked up intrinsic fracture, each fluctuation represents and has linked up an intrinsic fracture；At the end of whole pressing crack constructions, root
Go out the development density of intrinsic fracture according to the pressure-break length and pressure oscillation number, simple computation that calculate；
The ratio of the average injection pressure when amplitude of each pressure oscillation accounts for construction at that time is first calculated, during the injection of pressure oscillation
Between, calculate the discharge capacity and fluid volume for extending the stage intrinsic fracture；Results of fracture simulation software is finally recycled, it is final to calculate
Go out the physical dimension after all intrinsic fractures are extended；
Overall fluid loss coefficient：
2~3 instantaneous terminations of pumping, according to the termination of pumping pressure difference value of any two time, calculate overall fluid loss coefficient；
Three-dimensional stress is analyzed：
Asked for using micro rupture measuring technology is layered, with pressure break liquid measure 2-3m3, i.e. closing well after gash fracture；
The difference of instantaneous characteristics twice in pressing crack construction, calculate the tensile strength of rock.In conjunction with minimum water
Flat principal stress result, calculates maximum horizontal principal stress；
(4) the real-time tune ginseng in pressing crack construction：
Real-time tune ginseng when A intrinsic fractures characterisitic parameter changes：
If a intrinsic fracture agensis, is continued by FRACTURING DESIGN；
If b intrinsic fractures are developed, and desirably form longer man-made fracture, before main pressing crack construction, increase sand liquor ratio, then
The main pressing crack construction stage reduces sand liquor ratio；
If c intrinsic fractures are developed very much, powder pottery or flour sand sand liquor ratio will be improved, increases fracturing fluid viscosity, or reduces discharge capacity, profit
Opened in avoiding substantial amounts of microcrack；
If d reservoir conditions suitably form complex fracture form, by injecting low glutinous fracturing fluid, injection rate is improved, reduces starting
Sand liquor ratio；
The real-time tune ginseng of B overall fluid loss coefficients change：
If the overall fluid loss coefficient height amplitude of variation that the correspondence in a steps (3) is analyzed in real time within 20%, maintains former design
Preposition liquid measure and other parameters construction；
If b overall fluid loss coefficient height amplitudes of variation more than 20%, when overall fluid loss coefficient change is big, increases preposition liquid measure, dropped
Low starting sand liquor ratio, when overall fluid loss coefficient change is small, then reduce preposition liquid measure, increase starting sand liquor ratio；
Real-time tune ginseng when C three-dimensional stresses change：
If a overlyings rock pressure is minimum value, it is horizontal joint to show man-made fracture, now termination of pumping 30-60min；
If b two is higher than FRACTURING DESIGN to horizontal stress difference, show that crack is big for the probability that single double-vane symmetrically stitches, increase construction sand
Liquor ratio；
If c reservoir conditions suitably form complex fracture form, increase the ratio of low glutinous fracturing fluid, increase small particle proppant
Ratio, construction sand liquor ratio is reduced, improve the complexity for forming crack.
2. the real-time parameter adjustment method in pressing crack construction as claimed in claim 1, it is characterised in that：
If the operation pressure rate of climb is too fast：
1. rate of pressure rise<1MPa/min：Continue to construct by normal FRACTURING DESIGN program, now operation pressure, which rises, only reflects
Crack resistance increase, does not occur the situation of TSOP fracturing also.Meanwhile, it is to be noted that well head pressure limiting, avoids pressure window narrow；
2. rate of pressure rise>1MPa/min：Now inside crack may sand plug, rate of pressure rise is faster, nearly well crack
The probability that sand plug occurs is bigger；The amplitude risen according to operation pressure, construction sand liquor ratio is reduced, or stop the injection of proppant.
3. the real-time parameter adjustment method in pressing crack construction as claimed in claim 1, it is characterised in that：
Real-time tune ginseng when intrinsic fracture characterisitic parameter changes：
If b intrinsic fractures are developed, and desirably form longer man-made fracture, before main pressing crack construction, increase sand liquor ratio 1-
3%, the main pressing crack construction stage reduces sand liquor ratio 3-5%；
If c intrinsic fractures are developed very much, powder pottery or flour sand sand liquor ratio are brought up into 3-7%, fracturing fluid viscosity increase 20-
30mPa.s, or 10-30% discharge capacities are reduced, opened beneficial to substantial amounts of microcrack is avoided；
If d reservoir conditions suitably form complex fracture form, by injecting low glutinous fracturing fluid, range of viscosities 2-3mPa.s, improve
5-10m3Injection rate, reduce the sand liquor ratio 1-2% of starting.
4. the real-time parameter adjustment method in pressing crack construction as claimed in claim 1, it is characterised in that：
The real-time tune ginseng of overall fluid loss coefficient change：
If b overall fluid loss coefficient height amplitudes of variation more than 20%, when leakoff coefficent change is big, increase the preposition liquid measures of 10-20%,
2-5% starting sand liquor ratios are reduced, when overall fluid loss coefficient change is small, then reduce the preposition liquid measures of 10-20%, increase 2-5% startings
Sand liquor ratio.
5. the real-time parameter adjustment method in pressing crack construction as claimed in claim 1, it is characterised in that：
Real-time tune ginseng when three-dimensional stress changes：
If b two is higher than FRACTURING DESIGN to horizontal stress difference, shows that crack is big for the probability that single double-vane symmetrically stitches, increase 3-5%
Construction sand liquor ratio；
If c reservoir conditions suitably form complex fracture form, the ratio of the low glutinous fracturing fluids of increase 5-15%, increase 10-20%
Small particle proppant, 5-10% construction sand liquor ratios are reduced, improve the complexity for forming crack.
6. the real-time parameter adjustment method in pressing crack construction as claimed in claim 2, it is characterised in that：
Step 2.,
The amplitude risen according to operation pressure, construction sand liquor ratio 10-20% is reduced, or stop the injection of proppant.
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