CN106323749A - Device and method for quantificationally analyzing rock brittleness - Google Patents
Device and method for quantificationally analyzing rock brittleness Download PDFInfo
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- CN106323749A CN106323749A CN201610860965.7A CN201610860965A CN106323749A CN 106323749 A CN106323749 A CN 106323749A CN 201610860965 A CN201610860965 A CN 201610860965A CN 106323749 A CN106323749 A CN 106323749A
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a device and a method for quantificationally analyzing the rock brittleness. The device comprises a sample container, an ultrasonic wave probe, a sound emitting collecting device, a material test device, a radial strain gauge, an axial strain gauge and a data analysis device, wherein the sample container is provided with an opening and a through hole, and is configured to accommodate rock core samples; the ultrasonic wave probe is configured to collect sound emitting signals of the rock core samples; the sound emitting collecting device is configured to obtain the sound emitting parameter according to the sound emitting signal; the material test device is configured to provide stress to the rock core samples in the sample container so as to damage the rock core samples; the radial strain gauge and the axial strain gauge are configured to obtain the stress-strain parameter of the rock core sample by matching the material test device; the data analysis device is configured to quantificationally analyze the rock brittleness according to the sound emitting parameter and the stress-stain parameter which are synchronously collected in the rock core sample damage process. According to the device and the method provided by the invention, the rock brittleness of various rock cores can be fast, simply, conveniently and accurately subjected to quantificational analysis.
Description
Technical field
The present invention relates to geologic development field, in particular relate to the device and method of a kind of quantitative analysis rock brittleness.
Background technology
Fracturing is utilized reservoir rock to be transformed the important means being to improve well yield, especially for infiltration
The basis of reservoir hydrfracturing its economical and effective especially exploitation that rate is extremely low.
In water in fracturing technology, reservoir brittleness is to judge that can fracturing form complex fracture network in reservoir
Basis, be also hydraulic fracturing process parameter optimization and fracturing fluid the most basic.
In the prior art, on the one hand, propose the concept of brittleness index and for guide field for shale, but due to
The brittleness index that it uses is to determine with the content of Young's modulus and two elastic parameters of Poisson's ratio or " brittle mineral ", and rock
The brittleness of stone is and destroys relevant parameter, and the methods of two kinds of calculating brittleness the most do not reflect the character of the rock failure mechanism of rock, therefore its
The suitability is restricted, and i.e. in the shale in some region, the suitability is strong, and poor to other region, other lithology suitability.
On the other hand, the characteristic parameter of whole English teaching based on rock measures the brittleness characterizing rock.Wherein,
Characteristic parameter is mainly peak strength and the residual strength of rock.But owing to obtaining whole English teaching to press rigidity, control
System requirements processed is high, and conventional press is difficult to obtain rock Post peak Characteristic, it is difficult to obtain whole English teaching, especially for page
Rock is the most such.Therefore the success rate of the method is the highest.
To sum up, in the prior art, the analysis method for rock brittleness exists that the suitability is strong, equipment requirements high, behaviour
Make the problems such as complicated and success rate is low.Accordingly, it would be desirable to a kind of new device and method analyzing rock brittleness.
Summary of the invention
The invention provides the device of a kind of quantitative analysis rock brittleness, described device includes:
Shuttle, it is configured to accommodate core sample, described shuttle is configured with opening and through hole；
Ultrasound probe, it is by, on described through hole location and installation core sample in described shuttle, being configured to
Gather the acoustic emission signal of described core sample；
Acoustic emission harvester, it is configured to obtain acoustic emission parameters according to described acoustic emission signal；
Material test apparatus, the described core sample that it is configured in described shuttle provides stress described to destroy
Core sample；
Radial strain rule and axial strain rule, its by described opening location and installation at the core sample of described shuttle
On product, it is configured to mate with described material test apparatus and obtains the stress-strain parameter of described core sample；
Data analysis set-up, it is configured to according to the described acoustic emission of synchronous acquisition during destroyed of described core sample
Parameter and described stress-strain parameter quantitative analyze rock brittleness.
In one embodiment, described shuttle is the cylindrical shape of hollow.
In one embodiment, described device includes comprising 2 ultrasound probes, and described shuttle is configured with two and leads to
Hole, two described through holes are respectively configured at side wall upper part and the bottom of described shuttle.
In one embodiment, two described through hole omnidirectional distribution.
In one embodiment, described opening structure is in the sidewall of described shuttle, the shape of described opening and described footpath
Coupling is advised to strain gauge and axial strain.
In one embodiment, the collection a width of 50KHz-750KHz of ultrasound wave band of described ultrasound probe.
A kind of method that the invention allows for quantitative analysis rock brittleness, described method includes:
Prepare core sample；
Described core sample is loaded onto destruction, the acoustic emission of core sample described in synchronous acquisition during whole
Parameter and stress-strain parameter；
Rock brittleness according to core sample described in described acoustic emission parameters and described stress-strain Parameter analysis.
In one embodiment, described acoustic emission parameters includes the waveform of ultrasound wave, energy, rise time parameter.
In one embodiment, according to core sample described in described acoustic emission parameters and described stress-strain Parameter analysis
Rock brittleness, wherein, carry out qualitative characterization according to energy accumulation and time curve, and utilize rock generation macroscopic failure
Front accumulated energy accounting carries out quantitative analysis to rock brittleness.
In one embodiment, the Quantitative Analysis Model of described rock brittleness is:
Wherein, BiFor the crumbly coefficient of rock, EAE1For reaching acoustic emission accumulated energy value before macroscopic failure, EAE2For rock
Reach acoustic emission accumulated energy value during macroscopic failure..
According to assembly of the invention and method can quickly, easy, exactly rock brittleness to all kinds of rock cores carry out fixed
Component analysis.
The further feature of the present invention or advantage will illustrate in the following description.Further, the present invention Partial Feature or
Advantage will be become apparent by description, or be appreciated that by implementing the present invention.The purpose of the present invention and part
Advantage can be realized by step specifically noted in description, claims and accompanying drawing or be obtained.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with the reality of the present invention
Execute example to be provided commonly for explaining the present invention, be not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is method flow diagram according to an embodiment of the invention；
Fig. 2 is apparatus according to an embodiment of the present invention structure diagram；
Fig. 3 is the typical brittle rock characteristics of Acoustic Emission according to one embodiment of the invention and quantitative assessment figure；
Fig. 4 is the non-brittle ACOUSTIC EMISSION CHARACTERISTICS OF ROCKS of the typical case according to one embodiment of the invention and quantitative assessment figure.
Detailed description of the invention
Embodiments of the present invention are described in detail, whereby the enforcement personnel of the present invention below with reference to drawings and Examples
Can fully understand how application technology means are to solve technical problem for the present invention, and reach the process that realizes of technique effect and depend on
It is embodied as the present invention according to the above-mentioned process that realizes.If each embodiment it should be noted that do not constitute conflict, in the present invention
And each feature in each embodiment can be combined with each other, the technical scheme formed all protection scope of the present invention it
In.
The present invention proposes a kind of method of quantitative analysis rock brittleness.Concrete, the method for the present invention is by rock
Acoustic emission parameters and stress-strain parameter during destroyed are analyzed obtaining rock brittleness.Next combine
Accompanying drawing describes the implementation process of the method for embodiments of the invention in detail.Step shown in the flow chart of accompanying drawing can comprise
The such as computer system of one group of computer executable instructions performs.Although showing that the logic of each step is suitable in flow charts
Sequence, but in some cases, can be to be different from the step shown or described by order execution herein.
In an embodiment of the present invention, as it is shown in figure 1, first prepare core sample (step S110).Concrete, at this
In a bright embodiment, require core sample length, the depth of parallelism and end thereof according to International Rock mechanics association Rock Mechanics Test
Face is processed, and prepares standard core sample.
Then described core sample is loaded onto destruction (step S120).
In whole destructive process, acoustic emission parameters and the stress-strain parameter of core sample described in synchronous acquisition (walks
Rapid S130).Concrete, in one embodiment, acoustic emission parameters includes the waveform of ultrasound wave, energy, rise time parameter.Enter one
Step, in one embodiment, stress-strain parameter is stress time curve.
Rock brittleness (step finally according to core sample described in acoustic emission parameters and stress-strain Parameter analysis
S140).Concrete, in one embodiment, stress-strain parameter, the energy parameter of synchronous acquisition is processed, according to energy
Accumulative carry out qualitative characterization with time curve, and before utilizing rock to reach macroscopic failure accumulated energy accounting to rock brittleness
Carry out quantitative analysis.
Concrete, for the rock that brittleness is strong, early stage acoustie emission event is few, releases energy few, and the rock failure mechanism of rock is explosive
Destroying, before the rock failure mechanism of rock, accumulative acoustic emission energy is few；For the rock that brittleness is weak, acoustie emission event persistently occurs, the rock failure mechanism of rock
For the micro-destruction of persistence, before the rock failure mechanism of rock, accumulative acoustic emission energy is many.For parameters such as the acoustic emission energys that collects, by meter
Calculate accumulative acoustic emission energy accounting before rock reaches peak value, the brittleness of rock can be carried out quantitative analysis.
That is, occurring micro-destruction the most before rock reaches macroscopic failure, acoustic emission releases energy the most, then add up acoustic emission energy
Amount accounting is the biggest, and rock brittleness is the lowest；And rock occurs micro-destruction the fewest before reaching macroscopic failure, acoustic emission releases energy more
Few, then it is the least to add up acoustic emission energy accounting, and rock brittleness is the highest；Therefore, from rock brittleness essence, in an embodiment
In, the mathematical model utilizing acoustic emission parameters quantitative analysis rock brittleness is:
Wherein, BiFor the crumbly coefficient of rock, EAE1For reaching acoustic emission accumulated energy value before macroscopic failure, EAE2For rock
Reach acoustic emission accumulated energy value during macroscopic failure.
Further, in an embodiment of the present invention, based on historical data, the quantitative model of structural analysis rock brittleness is such as
Shown in table 1.
Table 1
The method of the present invention is from failure mechanism of rock, the essence of rock brittleness, and before utilizing the rock failure mechanism of rock, accumulative sound is sent out
Penetrate energy and account for accumulated energy accounting when the rock failure mechanism of rock occurs, the brittleness of rock is analyzed.Compared to prior art, the present invention
Brittleness analysis result more. accurately, rationally, the method for the present invention has higher adaptability.
Method based on the present invention, the present invention proposes the device of a kind of quantitative analysis rock brittleness.Concrete, at this
In a bright embodiment, as in figure 2 it is shown, device includes:
Shuttle 2, it is configured to accommodate core sample, shuttle is configured with opening and through hole；
Ultrasound probe (3 and 4), it is by, on through hole location and installation core sample in shuttle 2, being configured to adopt
The acoustic emission signal of collection core sample；
Acoustic emission harvester 5, it is configured to obtain acoustic emission parameters according to acoustic emission signal；
Material test apparatus 1, the core sample that it is configured in shuttle provides stress to destroy core sample；
Radial/axial strain gauge 6, it is by opening location and installation core sample in shuttle 2, be configured to
Material test apparatus 1 coordinates the stress-strain parameter obtaining core sample；
Data analysis set-up 7, its be configured to according to core sample during destroyed the acoustic emission parameters of synchronous acquisition with
And stress-strain parameter quantitative analysis rock brittleness.
Concrete, in one embodiment, shuttle 2 is the cylindrical shape of hollow.Device includes comprising 2 ultrasound probes
(3 and 4).Corresponding, shuttle is configured with two through holes.Concrete, in one embodiment, ultrasound probe is cylindrical,
Therefore through hole is cylindrical (form fit ultrasound probe).
Owing to through hole and opening are for being evenly arranged ultrasound probe and strain gauge on rock sample, therefore implement one
In example, two through holes are respectively configured at side wall upper part and the bottom of shuttle, and two through hole omnidirectional distribution.Opening structure exists
The sidewall of shuttle, the shape of opening is advised with radial strain rule and axial strain and is mated.Concrete, in one embodiment,
Open height is 3 centimetres, and angle is 270 degree.
In one embodiment, when carrying out the analysis of rock brittleness based on the device shown in Fig. 2, it is first according to shown in Fig. 1
Flow process prepares core sample；Then core sample is loaded in shuttle 2；Followed by the through hole on shuttle 2 and
Opening installs ultrasound probe (3 and 4) and radial/axial strain gauge 6 on core sample.
Next utilize material test apparatus 1 to destroy the core sample in shuttle 2, and collection core sample exists simultaneously
Acoustic emission parameters in destructive process and stress-strain parameter.Concrete, ultrasound probe (3 and 4) synchronizes to receive core sample
Ultrasound wave that product send also is converted into the signal of telecommunication；Acoustic emission harvester 5 receives the signal of telecommunication that ultrasound probe (3 and 4) transmits
And process, thus obtain acoustic emission parameters.Material test apparatus 1 uses universal testing machine, and it carries to core sample
For stress to destroy core sample.What the stress parameters of bond material assay device 1 and radial/axial strain gauge 6 obtained should
Variable element obtains the stress-strain parameter of core sample.
Final data analytical equipment 7 utilizes acoustic emission parameters and stress-strain parameter to carry out rock brittleness analysis.
Compared to prior art, assembly of the invention is simple, easy and simple to handle, Material Testing Machine rigidity, servo performance
Ask low, thus there is higher practical value and promotional value.
The specific implementation process of one embodiment of the invention is described below by way of concrete implementation environment.
In one embodiment, as in figure 2 it is shown, ultrasound probe 3 and 4 is fixed in shuttle 2 by location coupling
Core sample on；By on strain gauge 6 positioning installation core sample in shuttle 2；Ultrasound probe 3 and 4 is passed through
Single coaxial shielded cable is connected to acoustic emission harvester 5, and acoustic emission harvester 5 is connected to data analysis set-up 7；Simultaneously
Strain gauge 6 is coupled together with data analysis set-up 7, and sets respective channel parameter.
Utilize Material Testing Machine 1 that core sample is loaded onto destruction, high rigid material testing machine can be used properly
Load mode obtains stress time curve, and the strain parameter obtained in conjunction with strain gauge 6 obtains stress-strain parameter.Synchronous acquisition
Acoustic emission parameters in whole loading procedure, including parameters such as the waveform of ultrasound wave, energy, rise time.Finally utilize data
Analytical equipment 7 carries out rock brittleness analysis.
Concrete, in one embodiment, take a length of 50mm, a diameter of 25mm core sample carries out uniaxial compression experiment,
Use 500KN material test apparatus；Acoustic emission harvester sample frequency 40MHz；It is arranged symmetrically with 2 to surpass on core sample surface
Sonic probe, ultrasound probe a size of diameter 8mm, the cylinder of high 8mm, carry a width of 50KHz-750KHz.
It is embodied as result below by way of the concrete implementation environment explanation embodiment of the present invention.
In one embodiment, somewhere shale is carried out quantitative analysis rock brittleness test experience.
Fig. 3 is typical brittle rock characteristics of Acoustic Emission and the quantitative assessment schematic diagram of the present embodiment, wherein, when abscissa is
Between (unit: second), vertical coordinate is stress, energy, accumulated energy.As it is shown on figure 3, it is few to destroy early stage acoustie emission event, sound is sent out
Penetrating energy and accumulative acoustic emission energy is that step increases, macroscopically rock shows as sudden change formula and destroys, i.e. acoustie emission event and
Energy is mainly in rock failure mechanism of rock abrupt release, and rock substantially shows as Brittleness.Concrete, in the present embodiment, quantitatively divide
The mathematical model of analysis rock brittleness is:
(brittleness index is the rock brittleness that peak strength and residual strength characterize that utilizes of this testing result and synchronous acquisition
100%) having good concordance, i.e. this rock is brittle rock.Field hydraulic pressure break micro-seismic monitoring shows this rock core simultaneously
Place interval of interest fracturing forms obvious complex fracture network, and after pressure, yield fitting result further shows that crack
Complexity is high, shows that rock brittleness is high.
In another embodiment, somewhere pebbly sandstone is carried out quantitative analysis rock brittleness test experience.
Fig. 4 is the non-brittle ACOUSTIC EMISSION CHARACTERISTICS OF ROCKS of typical case and the quantitative assessment schematic diagram of the present embodiment.Wherein, abscissa is
Time (unit: second), vertical coordinate is stress, energy, accumulated energy.As shown in Figure 4, acoustie emission event is with the whole loading of rock
Process, micro-destruction persistently occurs, and before causing rock generation macroscopic failure, accumulative acoustic emission releases energy many, and rock does not breaks out
Property destroy, hence it is evident that show as ductile characteristic.In the present embodiment, the mathematical model of quantitative analysis rock brittleness is:
(brittleness index is the rock brittleness that peak strength and residual strength characterize that utilizes of this testing result and synchronous acquisition
5.04%) having good concordance, i.e. this rock is non-brittle rock.Field hydraulic pressure break micro-seismic monitoring shows simultaneously, should
Rock core place interval fracturing formed for symmetric double slot, further demonstrate that rock brittleness is relatively low.
While it is disclosed that embodiment as above, but described content is only to facilitate understand the present invention and adopt
Embodiment, be not limited to the present invention.Method of the present invention also can have other various embodiments.Without departing substantially from
In the case of essence of the present invention, those of ordinary skill in the art are when making various corresponding change or change according to the present invention
Shape, but these change accordingly or deform the scope of the claims that all should belong to the present invention.
Claims (10)
1. the device of a quantitative analysis rock brittleness, it is characterised in that described device includes:
Shuttle, it is configured to accommodate core sample, described shuttle is configured with opening and through hole；
Ultrasound probe, it, by described through hole location and installation core sample in described shuttle, is configured to gather
The acoustic emission signal of described core sample；
Acoustic emission harvester, it is configured to obtain acoustic emission parameters according to described acoustic emission signal；
Material test apparatus, the described core sample that it is configured in described shuttle provides stress to destroy described rock core
Sample；
Radial strain rule and axial strain rule, its by described opening location and installation at the core sample of described shuttle
On, it is configured to mate with described material test apparatus and obtains the stress-strain parameter of described core sample；
Data analysis set-up, it is configured to according to described core sample described acoustic emission parameters of synchronous acquisition during destroyed
And described stress-strain parameter quantitative analyzes rock brittleness.
Device the most according to claim 1, it is characterised in that described shuttle is the cylindrical shape of hollow.
Device the most according to claim 2, it is characterised in that described device includes comprising 2 ultrasound probes, described sample
Product container structure has two through holes, two described through holes to be respectively configured at side wall upper part and the bottom of described shuttle.
Device the most according to claim 3, it is characterised in that two described through hole omnidirectional distribution.
Device the most according to claim 2, it is characterised in that described opening structure is in the sidewall of described shuttle, institute
The shape stating opening is mated with described radial strain rule and axial strain rule.
Device the most according to claim 1, it is characterised in that the collection ultrasound wave band of described ultrasound probe is a width of
50KHz-750KHz。
7. the method for a quantitative analysis rock brittleness, it is characterised in that described method includes:
Prepare core sample；
Described core sample is loaded onto destruction, the acoustic emission parameters of core sample described in synchronous acquisition during whole
And stress-strain parameter；
Rock brittleness according to core sample described in described acoustic emission parameters and described stress-strain Parameter analysis.
Method the most according to claim 7, it is characterised in that described acoustic emission parameters include the waveform of ultrasound wave, energy,
Rise time parameter.
Method the most according to claim 8, it is characterised in that according to described acoustic emission parameters and described stress-strain
The rock brittleness of core sample described in Parameter analysis, wherein, carries out qualitative characterization according to energy accumulation and time curve, and
Before utilizing rock generation macroscopic failure, accumulated energy accounting carries out quantitative analysis to rock brittleness.
Method the most according to claim 9, it is characterised in that the Quantitative Analysis Model of described rock brittleness is:
Wherein, BiFor the crumbly coefficient of rock, EAE1For reaching acoustic emission accumulated energy value before macroscopic failure, EAE2Reach for rock
Acoustic emission accumulated energy value during macroscopic failure.
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| CN106813976A (en) * | 2017-01-16 | 2017-06-09 | 中国矿业大学 | A kind of standard coal rock sample product fracturing process seismoelectric magnetic effect synchronous monitoring device and method |
| CN107340229A (en) * | 2017-06-22 | 2017-11-10 | 中国矿业大学 | A kind of experimental provision and method for testing coal and rock dynamics |
| CN108519281A (en) * | 2018-02-27 | 2018-09-11 | 中国石油天然气股份有限公司 | Method, device and system for determining brittleness index of rock |
| CN108760513A (en) * | 2018-04-04 | 2018-11-06 | 山东科技大学 | A kind of real simulation hydraulic pressure effect stratigraphic structure evolution device and evolution method |
| CN110318743A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Thin interbed shale oil reservoir fracturing simulation experiment method and device |
| US12050297B2 (en) | 2020-09-11 | 2024-07-30 | Saudi Arabian Oil Company | Method and system for determining energy-based brittleness |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106813976A (en) * | 2017-01-16 | 2017-06-09 | 中国矿业大学 | A kind of standard coal rock sample product fracturing process seismoelectric magnetic effect synchronous monitoring device and method |
| CN106813976B (en) * | 2017-01-16 | 2019-05-14 | 中国矿业大学 | A kind of standard coal rock sample product fracturing process seismoelectric magnetic effect synchronous monitoring device and method |
| CN107340229A (en) * | 2017-06-22 | 2017-11-10 | 中国矿业大学 | A kind of experimental provision and method for testing coal and rock dynamics |
| CN108519281A (en) * | 2018-02-27 | 2018-09-11 | 中国石油天然气股份有限公司 | Method, device and system for determining brittleness index of rock |
| CN108519281B (en) * | 2018-02-27 | 2020-08-11 | 中国石油天然气股份有限公司 | Method, device and system for determining brittleness index of rock |
| CN110318743A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Thin interbed shale oil reservoir fracturing simulation experiment method and device |
| CN108760513A (en) * | 2018-04-04 | 2018-11-06 | 山东科技大学 | A kind of real simulation hydraulic pressure effect stratigraphic structure evolution device and evolution method |
| US12050297B2 (en) | 2020-09-11 | 2024-07-30 | Saudi Arabian Oil Company | Method and system for determining energy-based brittleness |
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