CN107153096A - Shale reservoir into seam aptitude tests method and device - Google Patents
Shale reservoir into seam aptitude tests method and device Download PDFInfo
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- CN107153096A CN107153096A CN201710488733.8A CN201710488733A CN107153096A CN 107153096 A CN107153096 A CN 107153096A CN 201710488733 A CN201710488733 A CN 201710488733A CN 107153096 A CN107153096 A CN 107153096A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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Abstract
The present invention provides a kind of shale reservoir into seam aptitude tests method and device, including：Each evaluation coefficient of sample is obtained, each evaluating includes Factor of Brittleness, speed stress sensitive sex index and the acoustic emission activity sex index of the sample；By the way that each evaluation coefficient is normalized, obtain the sample into seam merit rating coefficient.The shale reservoir that the present invention is provided into seam aptitude tests method and device, evaluation coefficient using the Factor of Brittleness of sample, speed stress sensitive sex index and acoustic emission activity sex index as evaluation shale reservoir sample into seam ability, so as to during being tested into seam ability shale reservoir, modeling fragility, intrinsic fracture development degree and the rupture activity for forming crack of shale are considered, so that test is more fully accurate, and it is simple to operate, it is adaptable to evaluation of the oil field compact reservoir into seam ability.
Description
Technical field
The present invention relates to shale testing field, more particularly to a kind of shale reservoir is into seam aptitude tests method and device.
Background technology
Shale gas exploitation has been included in China's petrol resources exploitation strategy.Due to shale reservoir matrix permeability it is extremely low, it is necessary to
Production capacity could be formed by fracturing reform.Different from conventional reservoir pressure break, the pressure break of shale reservoir requires to form disperse co-volume
Fracture network (volume fracturing).This depends on the ability and fracturing parameter of shale reservoir formation seam net.But simultaneously not all
Reservoir can be transferred through large-scale pressing crack construction and realize the transformation of large-scale volume fracturing, therefore, shale reservoir is into seam ability
Evaluate significant for preferred pressure break well section, prediction economic benefit.
Research shows whether reservoir possesses the condition for implementing volume transformation, is sent out depending on the modeling fragility of rock, intrinsic fracture
Educate situation and anisotropy.Up to the present, domestic and international shale reservoir is into stitching in aptitude tests scheme, generally by shale reservoir
" Factor of Brittleness " is equivalent into seam ability to evaluate.But actually fragility is not equivalent into seam ability, therefore, passes through existing page
Rock reservoir is evaluated into the compressibility that seam aptitude tests scheme can not be exactly to shale.
The content of the invention
The present invention provides a kind of shale reservoir into seam aptitude tests method and device, for solve existing shale reservoir into
Stitch the technical problem that aptitude tests scheme can not exactly to being evaluated into seam ability.
The first aspect of the invention is to provide a kind of shale reservoir into seam aptitude tests method, including：
Each evaluation coefficient of sample is obtained, it is quick that each evaluating includes the Factor of Brittleness of the sample, speed stress
Perceptual index and acoustic emission activity sex index；
By the way that each evaluation coefficient is normalized, obtain the sample into seam merit rating coefficient.
Another aspect of the present invention is to provide a kind of shale reservoir into seam aptitude tests device, including：
Acquisition module, each evaluation coefficient for obtaining sample, each evaluating includes the fragility system of the sample
Number, speed stress sensitive sex index and acoustic emission activity sex index；
Processing module, for by the way that each evaluation coefficient is normalized, obtaining being commented into seam ability for the sample
Valency coefficient.
The shale reservoir that the present invention is provided is into seam aptitude tests method and device, by the Factor of Brittleness of sample, speed stress
Sensitivity indices and acoustic emission activity sex index are as evaluation coefficient of the shale reservoir sample into seam ability is evaluated, so that right
During shale reservoir is tested into seam ability, considered the modeling fragility of shale, intrinsic fracture development degree and
The rupture activity in crack is formed, by the scheme for evaluating into seam ability jointly based on above-mentioned each evaluation coefficient so that test is more
For comprehensively accurately, and simple to operate, it is adaptable to evaluation of the oil field compact reservoir into seam ability.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention one provide shale reservoir into seam aptitude tests method schematic flow sheet；
Fig. 2 be the embodiment of the present invention two provide shale reservoir into seam aptitude tests method schematic flow sheet；
Fig. 3 be the embodiment of the present invention three provide shale reservoir into seam aptitude tests device structural representation.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.
Schematic flow sheet such as Fig. 1 institute of the shale reservoir that Fig. 1 is provided for the embodiment of the present invention one into seam aptitude tests method
Show, methods described includes：
101st, each evaluation coefficient of sample is obtained, each evaluating includes the Factor of Brittleness of the sample, speed should
Power sensitivity indices and acoustic emission activity sex index.
In the present embodiment, intrinsic fracture development degree and anisotropy etc. are also into the key factor of seam merit rating.
In practical application, experimental provision can be set up in laboratory, for standard sample (one inch or two inches of small core columns), is opened
Ultrasonic tesint is studied in exhibition room.Evaluate modeling fragility, the method for cranny development of shale reservoir jointly using ultrasonic wave and sound emission,
Carry out shale reservoir into seam Comprehensive Evaluation On Ability.
Wherein, the sample can be the compact reservoir rock core for being derived from underground or appearing, such as shale, tight sand isolith
The heart, rock core is cut and 25 millimeters of (mm) × 50mm core columns, 38mm × 76mm core columns or 50*100mm rock core is polished into
Post (one inch or two inches of small core columns), the side wall of sample and two end faces keep smooth, and wherein two end faces of sample are parallel
Degree is uniform in pressurized condition lower stress to ensure within ± 0.01mm.Accordingly, before 101, methods described can also be wrapped
Include：Compact reservoir rock core is prepared into the sample, the sample is cylinder, two faces parallels of the sample ±
In the range of 0.01mm.
Optionally, the modeling fragility of shale reservoir can by rock core brittle mineral component ratio, modulus of elasticity and Poisson's ratio,
The ratio between compression strength and tensile strength etc. are evaluated.In practical application, it can reflect that the modeling of shale samples is crisp by Factor of Brittleness
Property, further, Fragility parameters can be reflected by vertical transverse wave speed.
Specifically, it can be to carry out compressional wave and shear wave under normal temperature and pressure to sample first to obtain the process of Factor of Brittleness
Speed measurement, wave speed measurement can use ultrasonic pulse technology, that is, measure sample interior known paths on ultrasonic wave be transmitted through when
Between.For example, Fig. 2 is the waveform diagram arrived using ultrasonic pulse technical monitoring in the embodiment of the present invention one, such as Fig. 2 institutes
Show, first most compressional wave P ripple arrival times above, first most shear wave S ripple arrival times below, read the arrival of P ripples and S ripples
Time, according to known distance, you can calculate the compressional wave and transverse wave speed of standard sample, further utilize the vertical shear wave obtained
Speed calculates Young's modulus and Poisson's ratio, have rated the brittleness index of sample.Accordingly, it is described to obtain the crisp of the sample in 101
Property coefficient, can specifically include：
Using ultrasonic pulse technology, the diametric longitudinal wave velocity and transverse wave speed along the sample are gathered；
According to the longitudinal wave velocity, the transverse wave speed and the 3rd formula, calculate and obtain Young's modulus and Poisson's ratio, it is described
3rd formula is：Wherein, VpFor the longitudinal wave velocity, VsFor the shear wave
Velocity of wave, E is the Young's modulus, and ν is the Poisson's ratio；
According to the 4th formula, the Young's modulus is normalized, the Young's modulus after being normalized, the described 4th
Formula is：Ebrit=(E-10)/(80-10) × 100, wherein, EbritFor the Young's modulus after normalization；
According to the 5th formula, the Poisson's ratio is normalized, the Poisson's ratio after being normalized, the 5th formula
For：νbrit=(0.4- ν)/(0.4-0.15) × 100, wherein, νbritFor the Poisson's ratio after normalization；
According to the Young's modulus and Poisson's ratio and the 6th formula after the normalization, calculate and obtain the Factor of Brittleness,
6th formula is：BI=0.5Ebrit+0.5υbrit, wherein, BI is the Factor of Brittleness.
Wherein, the Young's modulus E after normalizationbritUnit be specifically as follows Gpa.In present embodiment, by fragility system
Count to reflect the modeling fragility of shale samples, specifically, Factor of Brittleness is bigger, then the fragility of shale is stronger.For example, fragility is worked as
Coefficient B I>When 40, rock is brittle；BI>When 60, rock brittleness is then very strong.
Based on above-mentioned embodiment, in practical application, it is possible to use ultrasonic probe monitors velocity of wave.Specifically, by a pair
Probe is fixed on the side of standard sample, the diametrically opposite velocity of wave of measurement standard sample.Occur using pulse signal generator
Signal, by transmitting probe, ultrasonic wave is propagated in the sample, is received by the corresponding receiving transducer of opposite side, is read arriving for waveform
Up to the time, compressional wave and transverse wave speed are obtained.Then corresponding, the utilization ultrasonic pulse technology gathers the diameter along the sample
The longitudinal wave velocity and transverse wave speed in direction, can specifically include：
Transmitting probe and receiving transducer are symmetrical arranged on the side wall of the sample, using ultrasonic pulse technology, institute is obtained
State the compressional wave and shear wave waveform in sample；
According to the compressional wave and shear wave waveform, the diametric(al) along the sample is obtained, the compressional wave and the shear wave are worn
Cross the duration used in the sample；
Diameter difference divided by the compressional wave and the shear wave by calculating the sample are obtained through the duration used in sample
Obtain the longitudinal wave velocity and the transverse wave speed.
Again specifically, can be by carrying out uniaxial loading to standard sample, and in loading procedure after obtaining Factor of Brittleness
Middle record per unit stress, for example, every MPa (Mpa), change obtains velocity of wave.It is quick that with stress variation its stress is obtained using velocity of wave
Perception.Accordingly, the speed stress sensitive sex index of the sample is obtained described in 101, can specifically be included：
By default step-length, the pressure of increase uniaxial loading on to the sample, until the sample burst；
Before the sample burst, by gathering the velocity of wave in sample diameter direction described in each first moment lower edge, institute is obtained
Relation of the velocity of wave with stress variation is stated, first moment applies pressure phase on to the sample when being and gathering velocity of wave with last time
Than when the current pressure applied on to the sample adds default threshold value at the time of correspondence；
According to relation of the velocity of wave with stress variation, the speed stress sensitive sex index of the sample is obtained.
Again specifically, the acoustic emission activity sex index can specifically include acoustic emission rate, wherein, the acoustic emission rate is
The sound emission number occurred in unit interval., can be using ultrasonic probe note during foregoing uniaxial loading in practical application
The acoustic emission rate produced by the extension of crack is recorded, to obtain the activity index of reservoir core rupture.Accordingly, the acquisition institute
The acoustic emission activity sex index of sample is stated, can specifically be included：
By default step-length, it is all that the pressure of increase uniaxial loading on to the sample, and record occur during this period
Sound emission number, until the sample burst；
According to the sound emission number, calculate and obtain the acoustic emission rate.
Optionally, it is possible to use ultrasonic probe monitors sound emission.Accordingly, it is described to press default step-length, increase single shaft
The pressure of loading on to the sample, and institute's acoustic emission number that record occurs during this period, until the sample burst, specifically
It can include：
By default step-length, the pressure of increase uniaxial loading on to the sample, and utilization is arranged on sample side wall
On ultrasonic probe, record institute acoustic emission number, until the sample burst.
102nd, by the way that each evaluation coefficient is normalized, obtain the sample into seam merit rating coefficient.
Specifically, using Factor of Brittleness, speed stress sensitive property coefficient, the activity index ruptured, setting up a synthesis
Evaluate compact reservoir sample into seam ability method, this method consider the modeling fragility of rock, intrinsic fracture development degree with
And eventually form the rupture activity in crack.Generally speaking, in the present embodiment, reservoir into seam Comprehensive Evaluation On Ability index
(Fracbility Index) is made up of three parts, i.e. Factor of Brittleness, stress sensitive property coefficient or fracture density, acoustic emission activity
Property.Accordingly, 102 can specifically include：
According to the first formula, each evaluation coefficient is normalized respectively, each evaluation coefficient after being normalized,
First formula is：Wherein, XidFor the evaluation coefficient after normalization；
According to each evaluation coefficient and the second formula after normalization, calculate and obtain described into seam merit rating coefficient, it is described
Second formula is：Wherein, FI is into seam Comprehensive Evaluation On Ability coefficient, and n is the individual of each evaluation coefficient
Number.
Wherein, it is specifically as follows percentages into seam Comprehensive Evaluation On Ability coefficient FI, is respectively evaluated described in the present embodiment
The number n of coefficient value is specially 3, XidLater single evaluation coefficient is respectively normalized, that is, represents Factor of Brittleness, stress
Sensitivity coefficient, AE activity etc..
Measured specifically, carrying out compressional wave and transverse wave speed under normal temperature and pressure to standard sample first, utilize the speed of acquisition
Young's modulus and Poisson's ratio are calculated, the brittleness index of sample is evaluated.And last rupture is forced into core sample progress single shaft, this
During sound emission produced by the extension of crack have recorded using ultrasonic probe, and obtain per MPa stress variations velocity of wave.Utilize
Velocity of wave obtains its stress sensitivity with stress variation, and the activity index of reservoir core rupture is obtained using sound emission.Using crisp
Property coefficient, stress sensitive property coefficient, rupture activity index, overall merit compact reservoir sample into seam ability.
The shale reservoir that the present embodiment is provided is into seam aptitude tests method, by the Factor of Brittleness of sample, speed stress sensitive
Sex index and acoustic emission activity sex index are as evaluation coefficient of the shale reservoir sample into seam ability is evaluated, so as to shale
During reservoir is tested into seam ability, modeling fragility, intrinsic fracture development degree and the formation of shale have been considered
The rupture activity in crack, by the scheme for evaluating into seam ability jointly based on above-mentioned each evaluation coefficient so that test is more complete
Face is accurate, and simple to operate, it is adaptable to evaluation of the oil field compact reservoir into seam ability.
Fig. 2 be the embodiment of the present invention two provide shale reservoir into seam aptitude tests method schematic flow sheet, such as Fig. 2 institutes
Show, methods described includes：
201st, compact reservoir rock core is prepared into sample；
202nd, at least three ultrasonic probes are arranged on the side wall of the sample, a probe is used for recording sound emission, one
Probe is used for monitor along the diametric longitudinal wave velocity of standard sample and transverse wave speed；
203rd, the Young's modulus and Poisson's ratio of sample are obtained using the p-and s-wave velocity of monitoring, and assesses its brittleness index；
204th, to sample uniaxial loading to rupturing, units MPa record compressional wave and transverse wave speed are often increased, and respective record is broken
Institute's acoustic emission number of generation before splitting；
205th, to acquisition brittleness index, speed stress sensitivity and rupture sound emission number is normalized, and synthesis is commented
Valency compact reservoir into seam ability.
Specifically, the detailed process and method in the present embodiment are referred to the related content in embodiment one.
The shale reservoir that the present embodiment is provided is into seam aptitude tests method, by the Factor of Brittleness of sample, speed stress sensitive
Sex index and acoustic emission activity sex index are as evaluation coefficient of the shale reservoir sample into seam ability is evaluated, so as to shale
During reservoir is tested into seam ability, modeling fragility, intrinsic fracture development degree and the formation of shale have been considered
The rupture activity in crack, by the scheme for evaluating into seam ability jointly based on above-mentioned each evaluation coefficient so that test is more complete
Face is accurate, and simple to operate, it is adaptable to evaluation of the oil field compact reservoir into seam ability.
Fig. 3 be the embodiment of the present invention three provide shale reservoir into seam aptitude tests device structural representation, such as Fig. 3 institutes
Show, described device includes：
Acquisition module 31, each evaluation coefficient for obtaining sample, each evaluating includes the fragility of the sample
Coefficient, speed stress sensitive sex index and acoustic emission activity sex index；
Processing module 32, for by the way that each evaluation coefficient is normalized, obtain the sample into seam ability
Evaluation coefficient.
In practical application, experimental provision can be set up in laboratory, for standard sample (one inch or two inches of small rocks
Stem), carry out indoor ultrasonic tesint research.Evaluate modeling fragility, the crack hair of shale reservoir jointly using ultrasonic wave and sound emission
The method educated, carry out shale reservoir into seam Comprehensive Evaluation On Ability.
Wherein, the sample can be the compact reservoir rock core for being derived from underground or appearing, such as shale, tight sand isolith
The heart, rock core is cut and the core column (one of 25mm × 50mm core columns, 38mm × 76mm core columns or 50*100mm is polished into
Inch or two inches of small core columns), the side wall of sample and two end faces keep smooth, wherein two faces parallels of sample ±
It is uniform in pressurized condition lower stress to ensure within 0.01mm.Accordingly, two faces parallels of the sample ±
In the range of 0.01mm.
Optionally, the modeling fragility of shale reservoir can by rock core brittle mineral component ratio, modulus of elasticity and Poisson's ratio,
The ratio between compression strength and tensile strength etc. are evaluated.In practical application, it can reflect that the modeling of shale samples is crisp by Factor of Brittleness
Property, further, Fragility parameters can be reflected by vertical transverse wave speed.
Specifically, it can be to carry out compressional wave and shear wave under normal temperature and pressure to sample first to obtain the process of Factor of Brittleness
Speed measurement, wave speed measurement can use ultrasonic pulse technology, that is, measure sample interior known paths on ultrasonic wave be transmitted through when
Between.Accordingly, acquisition module 31 can include：
First collecting unit, for utilizing ultrasonic pulse technology, gathers the diametric longitudinal wave velocity along the sample
And transverse wave speed；
First computing unit, for according to the longitudinal wave velocity, the transverse wave speed and the 3rd formula, calculating and obtaining Young
Modulus and Poisson's ratio, the 3rd formula is：Wherein, VpFor the compressional wave
Velocity of wave, VsFor the transverse wave speed, E is the Young's modulus, and ν is the Poisson's ratio；
First computing unit, is additionally operable to, according to the 4th formula, the Young's modulus be normalized, and obtains normalizing
Young's modulus after change, the 4th formula is：Ebrit=(E-10)/(80-10) × 100, wherein, EbritAfter normalization
Young's modulus；
First computing unit, is additionally operable to, according to the 5th formula, the Poisson's ratio be normalized, is normalized
Poisson's ratio afterwards, the 5th formula is：νbrit=(0.4- ν)/(0.4-0.15) × 100, wherein, νbritAfter normalization
Poisson's ratio；
First computing unit, is additionally operable to public according to the Young's modulus and Poisson's ratio after the normalization and the 6th
Formula, calculates and obtains the Factor of Brittleness, and the 6th formula is：BI=0.5Ebrit+0.5υbrit, wherein, BI is the fragility system
Number.
Wherein, the Young's modulus E after normalizationbritUnit be specifically as follows Gpa.In present embodiment, by fragility system
Count to reflect the modeling fragility of shale samples, specifically, Factor of Brittleness is bigger, then the fragility of shale is stronger.
Based on above-mentioned embodiment, in practical application, it is possible to use ultrasonic probe monitors velocity of wave.Specifically, by a pair
Probe is fixed on the side of standard sample, the diametrically opposite velocity of wave of measurement standard sample.Occur using pulse signal generator
Signal, by transmitting probe, ultrasonic wave is propagated in the sample, is received by the corresponding receiving transducer of opposite side, is read arriving for waveform
Up to the time, compressional wave and transverse wave speed are obtained.Then corresponding, first collecting unit includes：
First collection subelement, is visited for the transmitting probe by being symmetricly set on the side wall of the sample and reception
Head, using ultrasonic pulse technology, obtains the compressional wave and shear wave waveform in the sample；
First processing subelement, for according to the compressional wave and shear wave waveform, obtaining the diametric(al) along the sample, institute
Compressional wave and the shear wave are stated through the duration used in the sample；
First computation subunit, for by calculating the diameter of the sample respectively divided by the compressional wave and the shear wave are worn
The duration used in sample is crossed, the longitudinal wave velocity and the transverse wave speed is obtained.
Again specifically, can be by carrying out uniaxial loading to standard sample, and in loading procedure after obtaining Factor of Brittleness
Middle record per unit stress, for example, per Mpa, change obtains velocity of wave.Using velocity of wave its stress sensitivity is obtained with stress variation.
Accordingly, acquisition module 31 can also include：
First presser unit, for by default step-length, the pressure of increase uniaxial loading on to the sample, until described
Sample burst；
Second collecting unit, for before the sample burst, by gathering sample diameter described in each first moment lower edge
The velocity of wave in direction, obtains relation of the velocity of wave with stress variation, and first moment is applied to when being and gathering velocity of wave with last time
Pressure on the sample is compared, when the current pressure applied on to the sample adds default threshold value at the time of correspondence；
First processing units, for according to relation of the velocity of wave with stress variation, obtaining the speed stress of the sample
Sensitivity indices.
Again specifically, the acoustic emission activity sex index can specifically include acoustic emission rate, wherein, the acoustic emission rate is
The sound emission number occurred in unit interval., can be using ultrasonic probe note during foregoing uniaxial loading in practical application
The acoustic emission rate produced by the extension of crack is recorded, to obtain the activity index of reservoir core rupture.Accordingly, acquisition module 31
It can also include：
Second processing unit, for existing by default step-length, the pressure of increase uniaxial loading on to the sample, and record
The institute's acoustic emission number occurred during this, until the sample burst；
Second computing unit, for according to the sound emission number, calculating and obtaining the acoustic emission rate.
Optionally, it is possible to use ultrasonic probe monitors sound emission.Accordingly, the second processing unit, specifically for
By default step-length, the pressure of increase uniaxial loading on to the sample, and utilize the ultrasound being arranged on the wall of the sample side
Probe, record institute acoustic emission number, until the sample burst.
Specifically, using Factor of Brittleness, speed stress sensitive property coefficient, the activity index ruptured, setting up a synthesis
Evaluate compact reservoir sample into seam ability method, this method consider the modeling fragility of rock, intrinsic fracture development degree with
And eventually form the rupture activity in crack.Generally speaking, in the present embodiment, reservoir into seam Comprehensive Evaluation On Ability index
(Fracbility Index) is made up of three parts, i.e. Factor of Brittleness, stress sensitive property coefficient or fracture density, acoustic emission activity
Property.Accordingly, processing module 32 includes：
Normalization unit, for according to the first formula, being normalized, being normalized to each evaluation coefficient respectively
Each evaluation coefficient afterwards, first formula is：Wherein, XidFor the evaluation coefficient after normalization；
3rd computing unit, obtains described into seam for according to each evaluation coefficient and the second formula after normalization, calculating
Merit rating coefficient, second formula is：Wherein, FI is into seam Comprehensive Evaluation On Ability coefficient, and n is institute
State the number of each evaluation coefficient.
Wherein, it is specifically as follows percentages, X into seam Comprehensive Evaluation On Ability coefficient FIidRespectively normalize later
Single evaluation coefficient, that is, represent Factor of Brittleness, stress sensitive property coefficient, AE activity etc..
Measured specifically, carrying out compressional wave and transverse wave speed under normal temperature and pressure to standard sample first, utilize the speed of acquisition
Young's modulus and Poisson's ratio are calculated, the brittleness index of sample is evaluated.And last rupture is forced into core sample progress single shaft, this
During sound emission produced by the extension of crack have recorded using ultrasonic probe, and obtain per MPa stress variations velocity of wave.Utilize
Velocity of wave obtains its stress sensitivity with stress variation, and the activity index of reservoir core rupture is obtained using sound emission.Using crisp
Property coefficient, stress sensitive property coefficient, rupture activity index, overall merit compact reservoir sample into seam ability.
The shale reservoir that the present embodiment is provided is into seam aptitude tests device, by the Factor of Brittleness of sample, speed stress sensitive
Sex index and acoustic emission activity sex index are as evaluation coefficient of the shale reservoir sample into seam ability is evaluated, so as to shale
During reservoir is tested into seam ability, modeling fragility, intrinsic fracture development degree and the formation of shale have been considered
The rupture activity in crack, by the scheme for evaluating into seam ability jointly based on above-mentioned each evaluation coefficient so that test is more complete
Face is accurate, and simple to operate, it is adaptable to evaluation of the oil field compact reservoir into seam ability.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the device of foregoing description
Specific work process, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
It should be noted that each functional unit in various embodiments of the present invention can be integrated in a processing unit,
Can be that unit is individually physically present, can also two or more units it is integrated in a unit.It is above-mentioned integrated
Unit can both be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey
Sequence upon execution, performs the step of including above-mentioned each method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. a kind of shale reservoir into seam aptitude tests method, it is characterised in that including：
Each evaluation coefficient of sample is obtained, each evaluating includes the Factor of Brittleness of the sample, speed stress sensitivity
Index and acoustic emission activity sex index；
By the way that each evaluation coefficient is normalized, obtain the sample into seam merit rating coefficient.
2. according to the method described in claim 1, it is characterised in that described by the way that each evaluation coefficient is normalized,
Obtain the sample into seam merit rating coefficient, including：
According to the first formula, each evaluation coefficient is normalized respectively, each evaluation coefficient after being normalized is described
First formula is：Wherein, XidFor the evaluation coefficient after normalization；
According to each evaluation coefficient and the second formula after normalization, calculate and obtain described into seam merit rating coefficient, described second
Formula is：Wherein, FI is into seam Comprehensive Evaluation On Ability coefficient, and n is the number of each evaluation coefficient.
3. method according to claim 1 or 2, it is characterised in that the Factor of Brittleness of the acquisition sample includes：
Using ultrasonic pulse technology, the diametric longitudinal wave velocity and transverse wave speed along the sample are gathered；
According to the longitudinal wave velocity, the transverse wave speed and the 3rd formula, calculate and obtain Young's modulus and Poisson's ratio, the described 3rd
Formula is：Wherein, VpFor the longitudinal wave velocity, VsFor the shear wave
Speed, E is the Young's modulus, and ν is the Poisson's ratio；
According to the 4th formula, the Young's modulus is normalized, the Young's modulus after being normalized, the 4th formula
For：Ebrit=(E-10)/(80-10) × 100, wherein, EbritFor the Young's modulus after normalization；
According to the 5th formula, the Poisson's ratio is normalized, the Poisson's ratio after being normalized, the 5th formula is：
νbrit=(0.4- ν)/(0.4-0.15) × 100, wherein, νbritFor the Poisson's ratio after normalization；
According to the Young's modulus and Poisson's ratio and the 6th formula after the normalization, calculate and obtain the Factor of Brittleness, it is described
6th formula is：BI=0.5Ebrit+0.5υbrit, wherein, BI is the Factor of Brittleness.
4. method according to claim 1 or 2, it is characterised in that the speed stress sensitivity of the acquisition sample
Index, including：
By default step-length, the pressure of increase uniaxial loading on to the sample, until the sample burst；
Before the sample burst, by gathering the velocity of wave in sample diameter direction described in each first moment lower edge, the ripple is obtained
The fast relation with stress variation, compared with first moment is applies pressure on to the sample when last time gathering velocity of wave,
When the current pressure applied on to the sample adds default threshold value at the time of correspondence；
According to relation of the velocity of wave with stress variation, the speed stress sensitive sex index of the sample is obtained.
5. method according to claim 1 or 2, it is characterised in that the acoustic emission activity sex index includes acoustic emission rate,
The acoustic emission rate is the sound emission number occurred in the unit time.
6. method according to claim 5, it is characterised in that the acoustic emission activity sex index of the acquisition sample,
Including：
By default step-length, the pressure of increase uniaxial loading on to the sample, and record the sound hair of institute occurred during this period
Number is penetrated, until the sample burst；
According to the sound emission number, calculate and obtain the acoustic emission rate.
7. method according to claim 3, it is characterised in that the utilization ultrasonic pulse technology, is gathered along the sample
Diametric longitudinal wave velocity and transverse wave speed, including：
Transmitting probe and receiving transducer are symmetrical arranged on the side wall of the sample, using ultrasonic pulse technology, the sample is obtained
Compressional wave and shear wave waveform in product；
According to the compressional wave and shear wave waveform, the diametric(al) along the sample is obtained, the compressional wave and the shear wave pass through institute
State the duration used in sample；
Diameter difference divided by the compressional wave and the shear wave by calculating the sample obtain institute through the duration used in sample
State longitudinal wave velocity and the transverse wave speed.
8. method according to claim 6, it is characterised in that described to press default step-length, increase uniaxial loading is described
Pressure on sample, and the institute's acoustic emission number occurred during this period is recorded, up to the sample burst, including：
By default step-length, the pressure of increase uniaxial loading on to the sample, and utilization are arranged on the wall of the sample side
Ultrasonic probe, record institute acoustic emission number, until the sample burst.
9. according to the method described in claim 1, it is characterised in that before each evaluation coefficient for obtaining sample, in addition to：
Compact reservoir rock core is prepared into the sample, the sample is cylinder, and two faces parallels of the sample exist
In the range of ± 0.01mm.
10. a kind of shale reservoir into seam aptitude tests device, it is characterised in that including：
Acquisition module, each evaluation coefficient for obtaining sample, each evaluating includes Factor of Brittleness, the speed of the sample
Spend stress sensitive sex index and acoustic emission activity sex index；
Processing module, for by the way that each evaluation coefficient is normalized, obtain the sample into seam merit rating system
Number.
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