CN108519259A - A kind of artificial core and its preparation method and application - Google Patents
A kind of artificial core and its preparation method and application Download PDFInfo
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- CN108519259A CN108519259A CN201810201514.1A CN201810201514A CN108519259A CN 108519259 A CN108519259 A CN 108519259A CN 201810201514 A CN201810201514 A CN 201810201514A CN 108519259 A CN108519259 A CN 108519259A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/364—Embedding or analogous mounting of samples using resins, epoxy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
- G01N2001/386—Other diluting or mixing processes
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Abstract
A kind of artificial core of present invention offer and its preparation method and application.Wherein the preparation method includes the following steps：Quartz sand, feldspar, carbonate rock and clay mineral are mixed into two parts of different mixtures respectively according to two different default proportionings；Above-mentioned two parts of different mixtures are respectively mixed with epoxy resin, two parts of different pouring materials are accordingly obtained；Above-mentioned two parts different pouring materials are alternately poured in a mold, are compacted after often pouring one layer of pouring material；All pouring materials in mold are integrally compacted；And be heating and curing, obtain artificial core.Using artificial core made from the preparation method, it is capable of the stratification and bed plane of the inside development of accurate simulation natural core, to make the artificial core can be good at the mechanical property research for rock.
Description
Technical field
The present invention relates to a kind of artificial core and its preparation method and application more particularly to a kind of artificial rocks with stratification
The preparation method of the heart and artificial core obtained.
Background technology
In geological research, the common rock with bedded structure, stratification construction is most important a kind of structure in sedimentary rock
It makes.Stratification (stratification) generates in rock forming process, by material composition, granular size, color, structure
Construction etc. difference and show rock composition construction.Stratification is general several centimetres to several meters thick, and it can be several to be laterally extended
Centimetre to thousands of rice.Stratification is the most important deposition characteristics of sedimentary type formations.
Divisional plane between lithosphere is referred to as bed plane, bed plane be an important factor for influencing material properties of rock it
One.Influence of the bed plane to material properties of rock is studied, a large amount of rock core is needed.Currently, the mode of field sampling is taken to obtain more
Coring.But there are a large amount of irregular microfissures in natural core more, geophysics is established in the influence for studying stratification
Model generates interference.Also, the cost of field sampling is higher, can also be damaged to natural core in transportational process.In consideration of it,
The processing preparation of artificial core just becomes the hot spot studied at present.
For example Hou Bing et al. discloses a kind of preparation method of joint property shale artificial core, specifically by cement, quartz
Sand, clay, land plaster are mixed；A small amount of oatmeal, a scrap of paper are added into mixture, adds water stirring；Demixing pours
Cement sample is cast, one layer of lubricating oil is applied between layers, after cement sample drying and moulding, you can obtain joint property shale people
The lithogenesis heart.It can obtain that there is certain fracture development, stratification development, brittle cement sample using this method, can align
The mechanical properties such as the true bed plane, intrinsic fracture, hydraulic fracture for simulating joint property shale rock, so as to Efficient Development shale
Oil gas.Material used in this method is simple, of low cost, easy to operate, but during making rock core, except landwaste, mineral
Outside clast, matrix and cement, the other compositions such as oatmeal, a scrap of paper, lubricating oil are also mixed into, rock core is polluted, has been unfavorable for grinding
Study carefully influence of the ingredient to rock anisotropy and mechanical property etc., and lubricating oil easily penetrates into pore interior, fluid is to rock core wave
Speed, intensity etc. will produce influence, thus be easy to cause the inaccuracy of test result.
Zhang Guangqing et al. discloses a kind of production method of the artificial core with different stratification angles, passes through control adjacent two
Bed plane of the secondary interface for pouring material formation as rock mass, controls the length of the time interval of adjacent casting material twice to control
The intensity of bed plane processed drills through the inclination angle of machine base to drill through the rock core containing different stratification angles finally by rock core is adjusted.It should
Although method can obtain the rock core with different stratification angles, between gained bed plane and practical natural core still
Difference.
Although it can be seen that having the method for several making artificial rock cores both at home and abroad at present, for containing stratification rock core
Production method remained deficiency, therefore natural core can not accurately be simulated, thus be not well positioned to meet rock mechanics
The demand that can be studied.
Invention content
In view of the above-mentioned drawbacks in the prior art, a kind of artificial core of present invention offer and its preparation method and application, is adopted
The artificial core being prepared with the preparation method is capable of the stratification and bed plane of the inside development of accurate simulation natural core, from
And the artificial core being prepared is made to can be good at the mechanical property research for rock.
To achieve the above object, present invention firstly provides a kind of preparation method of artificial core, include the following steps：
Quartz sand, feldspar, carbonate rock and clay mineral are mixed into two parts respectively according to two different default proportionings
Different mixtures；
Above-mentioned two parts of different mixtures are respectively uniformly mixed with epoxy resin, two parts is accordingly obtained and different pours
Material；
Above-mentioned two parts different pouring materials are alternately poured in a mold, are compacted after often pouring one layer of pouring material；
After the completion of pouring, compaction moulding is integrally carried out to all pouring materials in mold, and to the sample after compaction moulding
It is complete be heated to epoxy resin cure, obtains artificial core.
In the preparation process of above-mentioned artificial core, the alternating pouring material that the pours gained after being compacted and being heating and curing pours
The stratification that layer can be used in simulation natural core is built, being formed by interlayer between adjacent two layers pouring layer can be used to simulation layer
Reason face；Due to using different formulations pouring material carry out alternately pour, so as to by bed plane both sides stratification vertically
Difference reaction come out, can accurate response bed plane media of both sides mineralogical composition difference.Therefore, system using the present invention
Preparation Method is capable of the stratification and bed plane of the inside development of accurate simulation natural core, it is thus possible to be used for the power of rock well
Learn performance study.
In above-mentioned mixture, matching when between these four raw mineral materials of quartz sand, feldspar, carbonate rock and clay mineral
Grain size etc. can rationally be adjusted according to the property of simulated artificial core.For example can rationally it be arranged according to the hardness of required artificial core
Proportioning between raw mineral materials.
Specifically, the different default proportioning of above two is following the first proportioning and the second proportioning：
The mixture of first proportioning is by the quartz sand of 2~3 parts by weight, the feldspar of 2~3 parts by weight, 0.5~1 parts by weight
Carbonate rock and the clay mineral of 3~5 parts by weight mix；
The mixture of second proportioning is by the quartz sand of 2~3 parts by weight, the carbon of the feldspar of 2~3 parts by weight, 3~4 parts by weight
Carbonate Rocks and the clay mineral of 1~3 parts by weight mix.
In above-mentioned raw mineral materials, carbonate rock is by the sedimentary rock of the self-existing numbers mineral composition such as calcite, dolomite.
Carbonate rock is important oil-saturated reservoir rock.The oil and natural gas in the whole world 50% is stored in carbonate rock.In addition, carbonate rock
Itself also it is a kind of of great value mineral products, is widely used in building, chemical industry, metallurgy etc..Carbonate rock used in the present invention,
It can voluntarily sample and process to obtain, it is also commercially available, it is not specially limited.
Quartz sand is quartz through the broken quartz particles being process.Feldspar is a kind of manosil AS containing calcium, sodium, potassium
Salt mineral.Clay mineral is some containing the hydrosilicate mineral based on aluminium, magnesium etc., is the main mine for forming clay rock and soil
Object.In the present invention, above-mentioned quartz sand, feldspar and clay mineral are further crushed after being commercially available or is commercially available to be added
Work uses.
The matter of mixture CLAY MINERALS AND THEIR SIGNIFICANCE can be changed by being sampled to natural core and constituent analysis is found in inventor
Content is measured, makes the stratification of artificial core obtained closer to the stratification of natural core.Specifically, in the first proportioning and the second proportioning
Mixture in, the mass content for controlling quartz sand is identical, and the mass content of feldspar is identical, and the mass content of clay mineral is not
Together.Such as in two parts of different mixtures, the mass content of quartz sand can be 20%, and the mass content of feldspar can be
25%, and the mass content of clay mineral may respectively be 50% and 20%, surplus is carbonate rock.
It should be noted that in the description of the present invention, term " the first proportioning ", " the second proportioning " are only used for facilitating description
Different raw material proportionings is not understood to indicate or imply ordinal relation and relative importance.
In the present invention, the granularity of mixture can be according to the porosity and permeability reasonable set of required artificial core, specifically
Porosity and permeability can refer to document with the correspondence mixed between material granularity《Ten thousand woods artificial core technologies of preparing of beam are ground
Study carefully [J], petroleum pipe and instrument, 2008,22 (2):72-74.》.In specific implementation process of the present invention, the granularity of carbonate rock
500~700 mesh generally are can be controlled in, the granularity of quartz sand, feldspar and clay mineral can be controlled in 20~200 mesh.
In the present invention, the granularity of the mixture of the first proportioning and the second proportioning is consistent.Specifically, grain can be pressed respectively
Degree requires processing quartz sand, feldspar, carbonate rock and clay mineral, is then mixed into respectively according to two different default proportionings
Two parts of different mixtures.
Epoxy resin cures for being bonded together the raw mineral materials particle in mixture, and by subsequent to simulate
The stratification of natural core.The dosage of epoxy resin is generally directly proportional to the total surface area of mixture, is embodied in the present invention
The mass ratio of Cheng Zhong, general control epoxy resin and mixture is (2~5)：100, it in this way can either be by the mineral in mixture
Feed particles are bonded as entirety, and avoid epoxy resin significantly and influence the property of porosity and permeability of artificial core etc..
The present invention is not specially limited the source of epoxy resin, commercially available or voluntarily prepare.Of the invention specific real
During applying, epoxy resin used is commercially available, is typically chosen epoxy resin product more universal and economic in the market, for example select
The epoxy resin that epoxide number is 0.48~0.54 is selected, other epoxy resin can also be selected according to actual demand.
As described above, raw material used in artificial core is used to prepare in the present invention, by quartz sand, feldspar, carbonate rock
It is formed with these four raw mineral materials of clay mineral and epoxy resin, due to preparing artificial core without containing existing in raw materials used
When oatmeal, a scrap of paper and the lubricating oil etc. that are often used be easy to pollute the component of rock core, and epoxy resin have passed through thermosetting chemical conversion
Type, so as to avoid when studying influence of the ingredient to the velocity of wave of rock, mechanical property and crack extension etc., artificial core is former
Expect the interference to result of study, ensure that the accuracy and reliability of corresponding result of study.
Above-mentioned two parts different pouring materials are alternately poured in a mold, are compacted after often pouring one layer of pouring material, it is real
It is exactly the deposition and consolidation during simulating diagenesis on border, so as to what is developed inside accurate simulation natural core
Stratification, and successfully make the artificial core with bed plane.
Wherein, the thickness of every layer of pouring material, the amount of pouring of pouring material can be according between required adjacent bed plane in other words
Spacing (thickness of stratification needed for i.e.) rationally adjustment；In view of subsequently also needing to implement to be compacted, so the thickness of general every layer of pouring material
Degree is slightly larger than the thickness of corresponding stratification, for example the thickness of required stratification is 0.8~10mm, then the thickness of corresponding pouring material is about controllable
System is in 1.2~1.3mm.
It is appreciated that the amount of pouring is bigger, the thickness of pouring material is higher in other words, to pressure caused by the pouring material of lower section
It is bigger, to influence the porosity and permeability etc. of final artificial core obtained, therefore, the generally control for the amount of pouring, with
The thickness (height) of final artificial core obtained is advisable no more than 100mm.
The time interval of compacting dynamics and adjacent two-step pouring can rationally be adjusted according to the cementing strength of required bed plane.Cause
This can control compacting dynamics, and rationally control pours time interval further to adjust according to the cementing strength of required bed plane
Cementing strength.In specific implementation process of the present invention, it is 5~20MPa that general control, which is compacted dynamics,.
In practical casting process, one layer of pouring material is often poured, is poured again after can standing a period of time at room temperature after compacting
Build another layer of pouring material.This section of time of repose, it is as so-called " time interval of adjacent two-step pouring ".
It is appreciated that time of repose is longer, i.e., the time interval of adjacent two-step pouring is bigger, then cementing strength is smaller；Instead
It, time of repose is shorter, and the time interval of adjacent two-step pouring is smaller in other words, then cementing strength is bigger.Of the invention specific
In implementation process, the time interval of adjacent two-step pouring is 1~3 hour, you can obtains more suitable cementing strength.
After the completion of pouring, i.e., pouring material fills up entire mold, then integrally presses all pouring materials in mold
It is real, to adjust the tensile strength of sample.Compacting dynamics is bigger, and tensile strength is also bigger.In specific implementation process of the present invention,
In whole compacting process, compacting dynamics is 20~50MPa, and the compacting time is 12~48 hours.
It is appreciated that passing through above-mentioned whole compacting, additionally it is possible to the porosity and permeability for further adjusting sample, to make
The porosity and permeability of finally obtained artificial core is closer to required porosity and permeability.
Heated to the sample after above-mentioned compaction moulding, be exactly actually make epoxy resin be cured and and mixture
Secure bond, to obtain the process of stratification.Specifically, drying temperature can rationally be set according to the solidification temperature of epoxy resin itself
It is fixed.In specific implementation process of the present invention, cured at a temperature of 50~120 DEG C.
It is appreciated that the shape and size of artificial core can be adjusted by controlling the shape and size of mold, preparing
After the completion, artificial core obtained is removed from the molds, it then can be according to corresponding test method and test equipment to sample
Shape and size requirement, selection, which suitably drills through angle and drills through or cut, obtains artificial core sample, to meet different surveys
Examination demand, it can be 0~90 ° that this, which drills through angle such as,.
It is the artificial core of cuboid obtained first in specific implementation process of the present invention, for example its size can be
300mm × 300mm × (60mm~100mm) (length × width × height), is then placed in rock core by the artificial core and drills through on machine base,
According to different testing requirements, the inclination angle of machine base is drilled through by adjusting rock core can drill through to obtain containing the artificial of different stratification angles
Core sample.
Secondly the present invention provides a kind of artificial core, be made using above-mentioned preparation method.
The present invention finally provides application of the above-mentioned artificial core in the mechanical property research of rock.It is prepared in the present invention
Obtained artificial core can be adapted for Wave Velocity Anisotropy in laboratory and test, stress sensitivity experiment, Hydraulic Fracturing Tests
Deng.
The preparation method of artificial core provided by the invention, due to raw materials used without using oatmeal, a scrap of paper, lubricating oil etc.
It is easy to pollute the component of rock core, avoids the influence to the velocity of wave of rock, mechanical property and crack extension etc. in research ingredient
When, interference of the impurity to result of study；By controlling the granularity of raw material, to be substantial access to porosity and the infiltration of natural core
Rate；It by changing the mineralogical composition of adjacent two layers, and is compacted after often pouring one layer, to simulate the deposition during diagenesis
Effect and consolidation, the stratification that accurate simulation natural core inside is developed, and the artificial core with bed plane is successfully made,
So as to be used for the mechanical property research of rock and the foundation of geophysical model well.
Also, the preparation method is simply controllable, not only effectively overcomes natural core and drills through difficult disadvantage but also solve
Existing artificial core stratification density problem difficult to control.
Artificial core provided by the present invention, the stratification developed inside accurate simulation natural core, and successfully make and have
The artificial core of bed plane, while interference of the impurity to follow-up study is also avoided, so as to be used for the power of rock well
Learn property research and the foundation of geophysical model.
Description of the drawings
Fig. 1 is the structural schematic diagram of obtained artificial core in a specific embodiment of the invention；
Fig. 2 is the photo in kind of artificial core obtained in the embodiment of the present invention 1；
Fig. 3 is the photo in kind one of artificial core sample obtained in the embodiment of the present invention 1；
Fig. 4 is the photo in kind two of artificial core sample obtained in the embodiment of the present invention 1.
Reference sign：
The first stratifications of 1-；The second stratifications of 2-；3- bed planes.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment 1
It is that preparation method as follows is prepared the present embodiment provides a kind of artificial core：
S1, quartz sand, feldspar, carbonate rock and clay mineral are mixed into two parts respectively by two different default proportionings
Different mixture, wherein two different default proportionings are following the first proportioning and the second proportioning：
The mixture of first proportioning includes the carbonic acid of the quartz sand of 2 parts by weight, the feldspar of 2.5 parts by weight, 0.5 parts by weight
The clay mineral of rock salt and 5 parts by weight；
The mixture of second proportioning includes the carbonic acid of the quartz sand of 2 parts by weight, the feldspar of 2.5 parts by weight, 3.5 parts by weight
The clay mineral of rock salt and 2 parts by weight.
In above-mentioned raw mineral materials, carbonate rock granularity is 600 mesh or so, and the granularity of other raw mineral materials is 80~150 mesh.
S2, above-mentioned two parts of different mixtures are respectively mixed and stirred for uniformly, accordingly to obtain two parts with epoxy resin
Different pouring materials.For convenience of description, the present embodiment is denoted as the first pouring material and the second pouring material respectively herein.
In the first pouring material and the second pouring material, epoxy resin used is E-51 epoxy resin, the matter with mixture
It is 3 to measure ratio：100.
S3, above-mentioned two parts different pouring materials are alternately poured in a mold, after often pouring one layer of pouring material, using pressing plate
It is compacted, control compacting dynamics is 5MPa, is divided between the adjacent two-step pouring time 1 hour.
S4, after the completion of pouring, whole compacting is carried out to all pouring materials in mold, the dynamics of compacting is 25MPa, compacting
Time be 12h；
S5, the sample after compaction moulding in step S4 is put into baking oven, after being heated 24 hours under 80 DEG C of constant temperature, solidification
It completes, obtains artificial core.
The structural schematic diagram of the artificial core can refer to Fig. 1 comprising the first stratification 1 and the second layer of alternately laminated setting
Reason 2 forms bed plane 3 between consecutive first layer reason 1 and the second stratification 2.Wherein, the first stratification 1 and the second stratification 2 be respectively by
First pouring material and the second pouring material are through pouring, being compacted, be formed by curing.
After tested, the porosity of the artificial core is 2.23%, permeability 0.025MDa.
For the photo in kind of the artificial core as shown in Fig. 2, whole is in cuboid body, specific size is 300mm × 300mm
× 80mm (length × width × height) is bed plane 3 at white dashed line therein.
Artificial core obtained by the present embodiment can be used for Wave Velocity Anisotropy experiment in laboratory, stress sensitivity experiment
And Hydraulic Fracturing Tests.
Above-mentioned artificial core is placed in rock core to drill through on machine base, according to above-mentioned different testing requirement, by adjusting rock
The inclination angle that the heart drills through machine base can drill through the artificial core sample containing different stratification angles, for example, Fig. 3 and Fig. 4 be respectively it is vertical and
3 direction of bed plane for being parallel to artificial core carries out drilling through obtained artificial core sample, and dotted portion is stratification in figure
Face 3.
Embodiment 2
It is that preparation method as follows is prepared the present embodiment provides a kind of artificial core：
S1, quartz sand, feldspar, carbonate rock and clay mineral are mixed into two parts respectively by two different default proportionings
Different mixture, wherein two different default proportionings are following the first proportioning and the second proportioning：
The mixture of first proportioning includes the carbonate rock of the quartz sand of 3 parts by weight, the feldspar of 2 parts by weight, 1 parts by weight
With the clay mineral of 4 parts by weight；
The mixture of second proportioning includes the carbonate rock of the quartz sand of 3 parts by weight, the feldspar of 2 parts by weight, 4 parts by weight
With the clay mineral of 1 parts by weight.
In above-mentioned raw mineral materials, carbonate rock granularity is 600 mesh or so, and the granularity of other raw mineral materials is 50~80 mesh.
S2, above-mentioned two parts of different mixtures are respectively mixed and stirred for uniformly, accordingly to obtain two parts with epoxy resin
Different pouring materials.For convenience of description, the present embodiment is denoted as the first pouring material and the second pouring material respectively herein.
In the first pouring material and the second pouring material, epoxy resin used is E-51 epoxy resin, the matter with mixture
It is 3 to measure ratio：100.
S3, above-mentioned two parts different pouring materials are alternately poured in a mold, after often pouring one layer of pouring material, using pressing plate
It is compacted, control compacting dynamics is 10MPa, is divided between the adjacent two-step pouring time 2 hours.
S4, after the completion of pouring, whole compacting is carried out to all pouring materials in mold, the dynamics of compacting is 30MPa, compacting
Time be for 24 hours；
S5, the sample after compaction moulding in step S4 is put into baking oven, after being heated 24 hours under 80 DEG C of constant temperature, solidification
It completes, obtains artificial core.
The structural schematic diagram of the artificial core can refer to Fig. 1 comprising the first stratification 1 and the second layer of alternately laminated setting
Reason 2 forms bed plane 3 between consecutive first layer reason 1 and the second stratification 2.Wherein, the first stratification 1 and the second stratification 2 be respectively by
First pouring material and the second pouring material are through pouring, being compacted, be formed by curing.
After tested, the porosity of the artificial core is 1.66%, permeability 0.048MDa.
The photo in kind of the artificial core is approximate with Fig. 2, generally cuboid, specific size be 300mm × 300mm ×
80mm (length × width × height).
Artificial core obtained by the present embodiment can be used for Wave Velocity Anisotropy experiment in laboratory, stress sensitivity experiment
And Hydraulic Fracturing Tests.
Above-mentioned artificial core is placed in rock core to drill through on machine base, according to above-mentioned different testing requirement, by adjusting rock
The inclination angle that the heart drills through machine base can drill through the artificial core sample containing different stratification angles.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of preparation method of artificial core, which is characterized in that include the following steps：
Quartz sand, feldspar, carbonate rock and clay mineral are mixed into two parts of differences respectively according to two different default proportionings
Mixture；
Above-mentioned two parts of different mixtures are respectively mixed with epoxy resin, two parts of different pouring materials are accordingly obtained；
Above-mentioned two parts different pouring materials are alternately poured in a mold, are compacted after often pouring one layer of pouring material；
After the completion of pouring, compaction moulding is integrally carried out to all pouring materials in mold, and carry out to the sample after compaction moulding
It is complete to be heated to the epoxy resin cure, obtains artificial core.
2. preparation method according to claim 1, which is characterized in that described two different default proportionings are following the
One proportioning and the second proportioning：
The mixture of first proportioning is by the quartz sand of 2~3 parts by weight, the carbonic acid of the feldspar of 2~3 parts by weight, 0.5~1 parts by weight
Rock salt and the clay mineral of 3~5 parts by weight mix；
The mixture of second proportioning is by the quartz sand of 2~3 parts by weight, the carbonate of the feldspar of 2~3 parts by weight, 3~4 parts by weight
Rock and the clay mineral of 1~3 parts by weight mix.
3. preparation method according to claim 1 or 2, which is characterized in that in two parts of different mixtures, quartz sand
Mass content is identical, and the mass content of feldspar is identical, and the mass content of clay mineral is different.
4. according to claim 1-3 any one of them preparation methods, which is characterized in that the granularity of the carbonate rock is 500
The granularity of~700 mesh, quartz sand, feldspar and clay mineral is 20~200 mesh.
5. according to claim 1-3 any one of them preparation methods, which is characterized in that the matter of the epoxy resin and mixture
Amount is than being (2~5)：100.
6. preparation method according to claim 1 or 5, which is characterized in that the epoxide number of the epoxy resin be 0.48~
0.54。
7. preparation method according to claim 1, which is characterized in that the mistake being compacted after often pouring one layer of pouring material
Cheng Zhong, control compacting dynamics are 5~20Mpa, and the time interval of adjacent two-step pouring is 1~3 hour.
8. preparation method according to claim 1, which is characterized in that be integrally compacted to all pouring materials in mold
During, control compacting dynamics is 20~50MPa, and the compacting time is 12~48h.
9. a kind of artificial core, which is characterized in that the artificial core is using any one of the claim 1-8 preparation method system
.
10. application of the artificial core in the mechanical property research of rock described in claim 9.
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| CN201810201514.1A CN108519259A (en) | 2018-03-12 | 2018-03-12 | A kind of artificial core and its preparation method and application |
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| CN109506996A (en) * | 2018-10-12 | 2019-03-22 | 西南石油大学 | A kind of shale chip sample preparation method for micron indentation test |
| CN110044675A (en) * | 2019-05-22 | 2019-07-23 | 重庆交通大学 | A kind of interbedding of soft and hard rocks rock sample producing device and production method |
| CN110320122A (en) * | 2019-06-12 | 2019-10-11 | 华北水利水电大学 | The accurate detection method of rock forming mineral degree of abrasion |
| CN112857935A (en) * | 2021-01-22 | 2021-05-28 | 上海大学 | Preparation method of large-grade-difference heterogeneous nonmagnetic core |
| CN112943176A (en) * | 2021-02-01 | 2021-06-11 | 重庆科技学院 | Method for measuring gas-oil relative permeability curve for simulating injection and production of oil reservoir type gas storage |
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