CN106323749B - A kind of device and method of quantitative analysis rock brittleness - Google Patents
A kind of device and method of quantitative analysis rock brittleness Download PDFInfo
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- CN106323749B CN106323749B CN201610860965.7A CN201610860965A CN106323749B CN 106323749 B CN106323749 B CN 106323749B CN 201610860965 A CN201610860965 A CN 201610860965A CN 106323749 B CN106323749 B CN 106323749B
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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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
Abstract
The invention discloses a kind of device and methods of quantitative analysis rock brittleness.The inventive system comprises: it is configured with the sample container of opening and through-hole, is configured to accommodate core sample；Ultrasonic probe is configured to acquire the acoustic emission signal of the core sample；Sound emission acquisition device is configured to obtain acoustic emission parameters according to the acoustic emission signal；Material test apparatus is configured to the core sample into the sample container and provides stress to destroy the core sample；Radial strain rule and axial strain rule, are configured to mate with the stress-strain parameter that the material test apparatus obtains the core sample；Data analysis set-up is configured to the acoustic emission parameters of synchronous acquisition and stress-strain parameter quantitative analysis rock brittleness during being destroyed according to the core sample.The apparatus according to the invention and method quick, easy, accurately can carry out quantitative analysis to the rock brittleness of all kinds of rock cores.
Description
Technical field
The present invention relates to geologic development fields, in particular relate to a kind of device and method of quantitative analysis rock brittleness.
Background technique
Being transformed using hydraulic fracturing to reservoir rock is the important means for improving well yield, especially for infiltration
The extremely low reservoir hydrfracturing of rate is even more the basis of its economical and effective exploitation.
In water in fracturing technology, reservoir brittleness is to judge that can hydraulic fracturing form complex fracture network in reservoir
Basis and hydraulic fracturing process parameter optimization and fracturing fluid are preferably basic.
In the prior art, on the one hand, the concept of brittleness index is proposed for shale and for instructing scene, but due to
Its brittleness index used is determined with the content of two elastic parameters of Young's modulus and Poisson's ratio or " brittle mineral ", and rock
The brittleness of stone is parameter relevant to destruction, and two kinds calculate the method for brittleness without the property for reflecting the rock failure mechanism of rock, therefore its
Applicability is restricted, i.e., the strong applicability in the shale of some regions, and poor to other regions, other lithology applicabilities.
On the other hand, the brittleness of the characteristic parameter measurement characterization rock of the whole English teaching based on rock.Wherein,
Characteristic parameter is mainly the peak strength and residual strength of rock.But due 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 whole English teaching is obtained, especially for page
Rock is more such.Therefore the success rate of this method is not high.
To sum up, in the prior art, for the analysis method of rock brittleness, that there are applicabilities is not strong, equipment requirement is high, behaviour
Make the problems such as complicated and success rate is low.Therefore, it is necessary to a kind of device and methods of new analysis rock brittleness.
Summary of the invention
The present invention provides a kind of device of quantitative analysis rock brittleness, described device includes:
Sample container is configured to accommodate core sample, is configured with opening and through-hole on the sample container；
Ultrasonic probe is configured to through the through-hole location and installation on the core sample in the sample container
Acquire the acoustic emission signal of the core sample；
Sound emission acquisition device is configured to obtain acoustic emission parameters according to the acoustic emission signal；
Material test apparatus, the core sample offer stress being configured into the sample container are described to destroy
Core sample；
Radial strain rule and axial strain rule, by it is described be open location and installation the sample container core sample
On product, it is configured to mate with the stress-strain parameter that the material test apparatus obtains the core sample；
Data analysis set-up is configured to the sound emission of synchronous acquisition during being destroyed according to the core sample
Parameter and the stress-strain parameter quantitative analyze rock brittleness.
In one embodiment, the sample container is hollow cylindrical shape.
In one embodiment, described device includes comprising 2 ultrasonic probes, and there are two logical for the sample container construction
Hole, two through-holes are respectively configured at side wall upper part and the lower part of the sample container.
In one embodiment, two through-hole omnidirectional distributions.
In one embodiment, the opening constructs the side wall in the sample container, the shape of the opening and the diameter
To strain gauge and axial strain rule matching.
In one embodiment, the acquisition ultrasonic wave bandwidth of the ultrasonic probe is 50KHz-750KHz.
The invention also provides a kind of methods of quantitative analysis rock brittleness, which comprises
Prepare core sample；
The core sample is carried out to be loaded onto destruction, in the whole process the sound emission of core sample described in synchronous acquisition
Parameter and stress-strain parameter；
According to the rock brittleness of core sample described in the acoustic emission parameters and the stress-strain Parameter analysis.
In one embodiment, the acoustic emission parameters include the waveform, energy, rise time parameter of ultrasonic wave.
In one embodiment, the core sample according to the acoustic emission parameters and the stress-strain Parameter analysis
Rock brittleness, wherein qualitative characterization is carried out according to energy accumulation and time curve, and macroscopic failure occurs using rock
Preceding accumulated energy accounting carries out quantitative analysis to rock brittleness.
In one embodiment, the Quantitative Analysis Model of the rock brittleness are as follows:
Wherein, BiFor the crumbly coefficient of rock, EAE1To reach sound emission accumulated energy value before macroscopic failure, EAE2For rock
Sound emission accumulated energy value when reaching macroscopic failure.
The apparatus according to the invention and method can quickly, it is easy, accurately the rock brittleness of all kinds of rock cores is determined
Amount analysis.
Other feature or advantage of the invention will illustrate in the following description.Also, Partial Feature of the invention or
Advantage will be become apparent by specification, or be appreciated that by implementing the present invention.The purpose of the present invention and part
Advantage can be realized or be obtained by step specifically noted in the specification, claims and drawings.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example and is used together to explain the present invention, be not construed as limiting the 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 and quantitative assessment figure according to one embodiment of the invention；
Fig. 4 is the non-brittle ACOUSTIC EMISSION CHARACTERISTICS OF ROCKS of typical case and quantitative assessment figure according to one embodiment of the invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, implementation personnel of the invention whereby
Can fully understand that how the invention applies technical means to solve technical problems, and reach technical effect realization process and according to
The present invention is embodied according to above-mentioned realization process.As long as 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, be formed by technical solution protection scope of the present invention it
It is interior.
The invention proposes a kind of methods of quantitative analysis rock brittleness.Specifically, method of the invention passes through to rock
Acoustic emission parameters and stress-strain parameter during being destroyed are analyzed to obtain rock brittleness.Next it combines
The implementation process of the method for attached drawing detailed description of the present invention embodiment.Step shown in the flow chart of attached drawing can comprising
It is executed in the computer system of such as a group of computer-executable instructions.Although the logic for showing each step in flow charts is suitable
Sequence, but in some cases, it can be with the steps shown or described are performed in an order that is different from the one herein.
In an embodiment of the present invention, as shown in Figure 1, preparing core sample (step S110) first.Specifically, in this hair
In a bright embodiment, require according to International Rock mechanics association's Rock Mechanics Test to core sample length, the depth of parallelism and its end
Face is processed, and standard core sample is prepared.
Then the core sample is carried out being loaded onto destruction (step S120).
The acoustic emission parameters of core sample described in synchronous acquisition and stress-strain parameter (step in entire destructive process
Rapid S130).Specifically, in one embodiment, acoustic emission parameters include the waveform, energy, rise time parameter of ultrasonic wave.Into one
Step, in one embodiment, stress-strain parameter is stress time curve.
The finally rock brittleness (step of the core sample according to acoustic emission parameters and stress-strain Parameter analysis
S140).Specifically, in one embodiment, handling the stress-strain parameter of synchronous acquisition, energy parameter, according to energy
It is accumulative to carry out qualitative characterization with time curve, and before reaching macroscopic failure using rock accumulated energy accounting to rock brittleness
Carry out quantitative analysis.
Specifically, the rock strong for brittleness, early period, acoustie emission event was few, released energy few, and the rock failure mechanism of rock is burst
It destroys, it is few to add up acoustic emission energy before the rock failure mechanism of rock；The rock weak for brittleness, acoustie emission event persistently occur, the rock failure mechanism of rock
It is more to add up acoustic emission energy for the micro- destruction of duration, before the rock failure mechanism of rock.For parameters such as collected acoustic emission energys, pass through meter
It calculates before rock reaches peak value and adds up acoustic emission energy accounting, quantitative analysis can be carried out to the brittleness of rock.
That is, rock reach occur before macroscopic failure it is micro- destroy more, sound emission releases energy more, then adds up sound emission energy
Amount accounting is bigger, and rock brittleness is lower；And rock reach occur before macroscopic failure it is micro- destroy fewer, sound emission releases energy more
It is few, then add up acoustic emission energy accounting with regard to smaller, rock brittleness is higher；Therefore, from rock brittleness essence, in an embodiment
In, utilize the mathematical model of acoustic emission parameters quantitative analysis rock brittleness are as follows:
Wherein, BiFor the crumbly coefficient of rock, EAE1To reach sound emission accumulated energy value before macroscopic failure, EAE2For rock
Sound emission accumulated energy value when reaching macroscopic failure.
Further, in an embodiment of the present invention, it is based on historical data, the quantitative model of structural analysis rock brittleness is such as
Shown in table 1.
Table 1
Method of the invention is sent out from failure mechanism of rock, the essence of rock brittleness using sound is added up before the rock failure mechanism of rock
It penetrates energy and accounts for accumulated energy accounting when the rock failure mechanism of rock occurs, the brittleness of rock is analyzed.Compared to the prior art, of the invention
Brittleness analysis result more it is accurate, rationally, method of the invention has stronger adaptability.
Based on method of the invention, the invention proposes a kind of devices of quantitative analysis rock brittleness.Specifically, in this hair
In a bright embodiment, as shown in Fig. 2, device includes:
Sample container 2 is configured to accommodate core sample, is configured with opening and through-hole on sample container；
Ultrasonic probe (3 and 4) is configured to adopt through through-hole location and installation on the core sample in sample container 2
Collect the acoustic emission signal of core sample；
Sound emission acquisition device 5 is configured to obtain acoustic emission parameters according to acoustic emission signal；
Material test apparatus 1 is configured to the core sample into sample container and provides stress to destroy core sample；
Radial/axial strain gauge 6, by opening location and installation on the core sample in sample container 2, be configured to
The cooperation of material test apparatus 1 obtains the stress-strain parameter of core sample；
Data analysis set-up 7, be configured to the acoustic emission parameters of synchronous acquisition during being destroyed according to core sample with
And stress-strain parameter quantitative analyzes rock brittleness.
Specifically, in one embodiment, sample container 2 is hollow cylindrical shape.Device includes comprising 2 ultrasonic probes
(3 and 4).Corresponding, there are two through-holes for sample container construction.Specifically, in one embodiment, ultrasonic probe is cylinder,
Therefore through-hole is cylindrical (shape matching ultrasonic probe).
Since through-hole and opening on rock sample for being evenly arranged ultrasonic probe and strain gauge, implement one
In example, two through-holes are respectively configured at side wall upper part and the lower part of sample container, and two through-hole omnidirectional distributions.Opening construction exists
The shape of the side wall of sample container, opening is matched with radial strain rule and axial strain rule.Specifically, 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 device shown in Fig. 2, first, in accordance with shown in FIG. 1
Process prepares core sample；Then core sample is loaded into sample container 2；Followed by sample container 2 through-hole and
Opening installs ultrasonic probe (3 and 4) and radial/axial strain gauge 6 on core sample.
Next the core sample in sample container 2 is destroyed using material test apparatus 1, and acquires core sample simultaneously and exists
Acoustic emission parameters and stress-strain parameter in destructive process.Specifically, ultrasonic probe (3 and 4) synchronous reception core sample
The ultrasonic wave of product sending is simultaneously converted into electric signal；Sound emission acquisition device 5 receives the electric signal that ultrasonic probe (3 and 4) are transmitted
And handled, to obtain acoustic emission parameters.Material test apparatus 1 uses universal testing machine, mentions to core sample
For stress to destroy core sample.What the stress parameters and radial/axial strain gauge 6 of bond material experimental rig 1 obtained answers
The stress-strain parameter of variable element acquisition core sample.
Final data analytical equipment 7 carries out the analysis of rock brittleness using acoustic emission parameters and stress-strain parameter.
Compared to the prior art, the device of the invention is simple, easy to operate, wants to Material Testing Machine rigidity, servo performance
Ask low, thus practical value with higher and promotional value.
Illustrate the specific implementation process of one embodiment of the invention below by way of specific implementation environment.
In one embodiment, as shown in Fig. 2, ultrasonic probe 3 and 4 is fixed in sample container 2 by positioning coupling
Core sample on；By 6 positioning installation of strain gauge on the core sample in sample container 2；Ultrasonic probe 3 and 4 is passed through
Single coaxial shielded cable is connected to sound emission acquisition device 5, and sound emission acquisition device 5 is connected to data analysis set-up 7；Simultaneously
Strain gauge 6 and data analysis set-up 7 are connected, and set respective channel parameter.
Core sample is carried out using Material Testing Machine 1 to be loaded onto destruction, high rigidity Material Testing Machine can be used properly
Loading method 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 entire loading procedure, the parameters such as waveform, energy, rise time including ultrasonic wave.Finally utilize data
Analytical equipment 7 carries out the analysis of rock brittleness.
Specifically, in one embodiment, taking length is 50mm, diameter is that 25mm core sample carries out uniaxial compression experiment,
Using 500KN material test apparatus；Sound emission acquisition device sample frequency 40MHz；2 are arranged symmetrically on core sample surface to surpass
Sonic probe, ultrasonic probe is having a size of diameter 8mm, the cylinder of high 8mm, bandwidth 50KHz-750KHz.
Illustrate the specific implementation result of the embodiment of the present invention below by way of specific implementation environment.
In one embodiment, quantitative analysis rock brittleness test experience is carried out to somewhere shale.
Fig. 3 is the typical brittle rock characteristics of Acoustic Emission and quantitative assessment schematic diagram of the present embodiment, wherein when abscissa is
Between (unit: second), ordinate is stress, energy, accumulated energy.As shown in figure 3, destroying, acoustie emission event early period is few, and sound is sent out
Penetrate energy and accumulative acoustic emission energy for step growth, macroscopically rock show as mutation formula destruction, i.e., acoustie emission event and
For energy mainly in rock failure mechanism of rock abrupt release, rock obviously shows as Brittleness.Specifically, in the present embodiment, quantitative point
Analyse the mathematical model of rock brittleness are as follows:
(brittleness index is the rock brittleness of the testing result and synchronous acquisition characterized using peak strength and residual strength
100%) there is good consistency, i.e. this rock is brittle rock.Field hydraulic pressure break micro-seismic monitoring shows the rock core simultaneously
Place interval of interest hydraulic fracturing forms apparent complex fracture network, and yield fitting result further shows that crack after pressure
Complexity is high, shows that rock brittleness is high.
In another embodiment, quantitative analysis rock brittleness test experience is carried out to somewhere pebbly sandstone.
Fig. 4 is the non-brittle ACOUSTIC EMISSION CHARACTERISTICS OF ROCKS of typical case and quantitative assessment schematic diagram of the present embodiment.Wherein, abscissa is
Time (unit: second), ordinate are stress, energy, accumulated energy.As shown in figure 4, acoustie emission event is entirely loaded with rock
Process, micro- destruction is lasting to be occurred, and accumulative sound emission releases energy more before causing rock that macroscopic failure occurs, and rock is not broken out
Property destroy, hence it is evident that show as ductile characteristic.In the present embodiment, the mathematical model of quantitative analysis rock brittleness are as follows:
(brittleness index is the rock brittleness of the testing result and synchronous acquisition characterized using peak strength and residual strength
5.04%) there is good consistency, i.e. this rock is non-brittle rock.Field hydraulic pressure break micro-seismic monitoring shows this simultaneously
Interval hydraulic fracturing formation is symmetric double slot where rock core, further demonstrates that rock brittleness is lower.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Method of the present invention can also have other various embodiments.Without departing substantially from
In the case where essence of the present invention, those skilled in the art make various corresponding changes or change in accordance with the present invention
Shape, but these corresponding changes or deformation all should belong to scope of protection of the claims of the invention.
Claims (6)
1. a kind of device of quantitative analysis rock brittleness, which is characterized in that described device includes:
Sample container is configured to accommodate core sample, is configured with opening and through-hole on the sample container；
Ultrasonic probe is configured to acquire through the through-hole location and installation on the core sample in the sample container
The acoustic emission signal of the core sample, wherein described device includes comprising 2 ultrasonic probes, the sample container construction
There are two through-hole, two through-holes are respectively configured at side wall upper part and the lower part of the sample container, and two through-holes are just
Hand over distribution；
Sound emission acquisition device is configured to obtain acoustic emission parameters according to the acoustic emission signal；
Material test apparatus is configured to the core sample into the sample container and provides stress to destroy the rock core
Sample；
Radial strain rule and axial strain rule, by it is described be open location and installation the sample container core sample
On, it is configured to mate with the stress-strain parameter that the material test apparatus obtains the core sample；
Data analysis set-up is configured to the acoustic emission parameters of synchronous acquisition during being destroyed according to the core sample
And the stress-strain parameter quantitative analyzes rock brittleness, wherein qualitative according to energy accumulation and time curve progress
Characterization, and using rock occur macroscopic failure before accumulated energy account for the rock failure mechanism of rock occur when accumulated energy accounting to rock brittleness into
Row quantitative analysis, then observe rock occur macroscopic failure before acoustie emission event and release energy to analyze lithologic character, institute
State the waveform, energy, rise time parameter that acoustic emission parameters include ultrasonic wave.
2. the apparatus according to claim 1, which is characterized in that the sample container is hollow cylindrical shape.
3. the apparatus of claim 2, which is characterized in that side wall of the opening construction in the sample container, institute
The shape for stating opening is matched with the radial strain rule and axial strain rule.
4. the apparatus according to claim 1, which is characterized in that the acquisition ultrasonic wave bandwidth of the ultrasonic probe is
50KHz-750KHz。
5. a kind of method of quantitative analysis rock brittleness, which is characterized in that the described method includes:
Prepare core sample；
The core sample being contained in sample container is carried out being loaded onto destruction, utilizes ultrasonic probe in the whole process
With the acoustic emission parameters of core sample described in sound emission acquisition device synchronous acquisition, and using radial strain rule and axial answer
Becoming the stress-strain parameter of core sample described in rule synchronous acquisition, wherein sample container construction is there are two through-hole, and two
The through-hole is respectively configured at side wall upper part and the lower part of the sample container, two through-hole omnidirectional distributions, the ultrasound
Wave probe has 2, and the ultrasonic probe is by the through-hole location and installation on the core sample in the sample container；
According to the rock brittleness of core sample described in the acoustic emission parameters and the stress-strain Parameter analysis, wherein root
Qualitative characterization is carried out according to energy accumulation and time curve, and accounts for rock using accumulated energy before rock generation macroscopic failure and breaks
Accumulated energy accounting carries out quantitative analysis to rock brittleness when bad generation, then observes rock and the sound emission before macroscopic failure occurs
Event analyzes lithologic character with releasing energy, and the acoustic emission parameters include waveform, energy, the rise time ginseng of ultrasonic wave
Number.
6. according to the method described in claim 5, it is characterized in that, the Quantitative Analysis Model of the rock brittleness are as follows:
Wherein, BiFor the crumbly coefficient of rock, EAE1To reach sound emission accumulated energy value before macroscopic failure, EAE2Reach for rock
Sound emission accumulated energy value when macroscopic failure.
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| 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 |
| 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 |
| CN110318743B (en) * | 2018-03-30 | 2022-06-21 | 中国石油化工股份有限公司 | Fracturing simulation test method and device for thin interbed shale oil reservoir |
| 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 |
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