CN104089806A - Man-made rock core with multi-pore structure and preparation method of man-made rock core - Google Patents
Man-made rock core with multi-pore structure and preparation method of man-made rock core Download PDFInfo
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Abstract
The invention discloses a man-made rock core with a multi-pore structure and a preparation method of the man-made rock core. The preparation method comprises the following steps: preparing rock debris, inorganic salt particles and thin metal sheets; uniformly mixing the rock debris with an epoxy resin cementing agent; when adding a mixture into a mould, randomly embedding the designed inorganic salt particles and/or the thin metal sheets; solidifying; detaching the mould and taking out the man-made rock core; immersing the man-made rock core in distilled water and dissolving the inorganic salt particles to form dissolving holes; immersing or leaching the rock core by corresponding acid or alkali to form cracks; and finally, washing the man-made rock core with distilled water, and drying to obtain the man-made rock core with the multi-pore structure. According to the man-made rock core provided by the invention, the cracks and dissolving hole parameters of the rock core can be quantitatively controlled; the obtained man-made rock core is very similar with a natural rock core, so as to provide high-quality, low-cost and pollution-free experimental materials for simulation and test of physical properties including waves, seepage, conductivity and the like of rock.
Description
Technical field
The present invention relates to a kind of synthetic core of simulating porous rock and preparation method thereof, belong to and analyze and survey control technology field.Can be used as the experiment rock core of experimental study rock microscopic percolation mechanism, acoustic wave character, electrical characteristics etc., also can be used to evaluate the different validity of rate of oil and gas recovery technology (as surfactant flooding, water drive, polymer flooding etc.) for multi-modal pore system structure reservoir that improves.
Background technology
Subsurface rock belongs to porous medium, and except interparticle pore, also normal growth has crack, dissolution pore etc.; General interparticle pore is primary pore, and crack, dissolution pore etc. is secondary pores.The pore network of these dissimilar hole compositions is important hydrocarbon pore volume and seepage channels.Multi-modal pore system structure refers to and contains two or more porosity type simultaneously, such as crack-pore type, solution cavity-pore type etc.Containing the rock of multi-modal pore system structure favourable reservoir of oil and gas often, the physical property (acoustic wave character, seepage characteristic and electrical characteristics) of research multi-modal pore system rock is significant with exploitation for oil-gas exploration.
Experiment test is the direct method of research multi-modal pore system structure petrophysical property.Adopt true core to carry out the character of the physical testing energy true reflection underground oil and gas reservoirs such as acoustic velocity, permeability, conductivity, but multi-modal pore system structure rock shows very strong nonuniformity, anisotropy and multiple dimensioned property, is difficult to obtain representative natural core.In addition, the underground cost of coring is high, and the quality of coring is difficult for ensureing; Experimental repeatability is poor, and the pore texture of true core varies, and is unfavorable for carrying out single factor analysis research, causes that experimental study efficiency is low, the cycle is long.Therefore, the experimental data of true core is used for checking and the correction of theoretical model and experimental formula.
The Changing Pattern of the physical propertys such as the seepage flow of research multi-modal pore system structure rock, sound wave, conductivity, need to adopt the rock core of known pore texture to carry out a large amount of experiment tests.Preparing multi-modal pore system structure synthetic core is basis economic, that carry out efficiently rock physics experiment.Synthetic core is wanted skeleton and the pore texture of feasible simulation true core.Hole aspect ratio (aspect ratio is called for short AR) and characteristic dimension are two important parameters that characterize pore shape.Hole aspect ratio refers to the length ratio of hole minor axis and major axis; The characteristic dimension of hole characterizes the size of hole, refers generally to the long axis length of hole.
At present, for the rock that only contains interparticle pore, as conventional sandstone, comparative maturity of its Artificial Core Making technique: according to the factor of porosity of reservoir sandstone, permeability situation, choose the silica sand of suitable particle diameter as rock skeleton, mix with jointing compound, compacting is cementing, between quartz sand particle, form the interparticle pore of hollow, the synthetic core of making can be used for the experiment test of different physical properties.But for except interparticle pore, also contain the multi-modal pore system structure rock of the secondary pores such as crack, dissolution pore, as carbonatite, its simulation core technology is also immature, and method is relatively simple; And the synthetic core of making often can only be used for the experiment test of a certain physical property.
Report for the multi-modal pore system structure synthetic core preparation method of sonic test more, such as thin slice combined method (Cao's equalization, 2004; Hao Shouling etc., 2004), block cutting method (Li Qiong etc., 2006), casting method (Ass ' ad et al., 1992; Wei Jianxin, 2002; Bi influential officials etc., 2009; Wang et al., 2012) etc., the subject matter that these methods exist has: acoustic characteristic and the true core difference of (1) synthetic core skeleton are larger, and analog result could be used for engineering reality after need to transforming according to theoretical model, and whether this conversion rationally needs to be inquired into; (2) pore-size adjustment is subject to certain limitation, and pore texture is limited to simple combination, and for Complicated Pore Structures, rock core preparation process becomes comparatively complexity and is even difficult to realize.Another method is that (prince's embedding inlay technique shakes etc., 201310022534.X), the method adopts landwaste and epoxy resin adhesive to construct synthetic core skeleton, in skeleton, embed soft rubber sheet or the plastic sheet simulation secondary pores of different size and shape, multi-pore media can be aspect acoustic characteristic, effectively simulated, but the experiment test of the characteristic such as seepage flow, conductivity cannot be used for.
Preparation for the multi-modal pore system structure synthetic core of Seepage Experiment is mainly based on photoengraving glass plate method (Guo Shang equality, 1990), on this basis the different crack of etching again.Hole-fissured structure seepage flow of the method simulating two-dimensional, the physical model of making can not carry out the experiment test of the characteristics such as acoustics, conductivity.
Synthetic core or physical model report for electric conduction of rock characteristic research are less, generally all adopt true core or conventional synthetic core; At present, be not yet seen in report for the multi-modal pore system structure synthetic core of conductive characteristic research.
The crack or the dissolution pore that in synthetic core, comprise hollow are the basic demands that can simultaneously test for sound wave, seepage flow, electrical characteristics etc.The crack or the dissolution pore that form at present hollow mainly contain two class methods: the one, and before rock core moulding, insert sheet metal and extract again, form crack; The method can only form the crack of running through rock core, and inserts and extract very difficult control on opportunity of sheet metal, and success ratio is lower.Another kind method is in rock core, to put in advance certain material, after rock core is shaped, forms hollow by physical method; Heat again and make its volatilization, put into rosin etc. and use again organic solvent dissolution such as putting into camphor sheet.The method can better be controlled dissolution pore parameter, but is difficult to control parameters of fissure (shape, size, thickness, quantity, inclination angle etc.), and the experimental results of the synthetic core of acquisition is not easy to carry out quantitative test; Dissolution pore and crack are confined in a plane, and are interconnected, larger with the complex distributions difference of actual rock core; The organism adopting in preparation process has harm to health and Environmental security.
Summary of the invention
The present invention is intended at least solve one of technical matters existing in prior art.
To achieve these goals, propose according to an aspect of the present invention a kind of preparation method of multi-modal pore system structure synthetic core, comprise the following steps:
(1) prepare the landwaste corresponding with the natural core that needs simulation;
(2) prepare to prepare the material of simulating secondary pores in synthetic core, described secondary pores comprises one or both in crack, dissolution pore:
If need the natural core of simulation to contain crack, according to the average-size in crack and aspect ratio, the sheet metal of processing same size (d) and corresponding thickness (h), the crack density (ε) of simulation according to actual needs, determines the quantity (n) of required sheet metal; Wherein, the size of described sheet metal refers on sheet metal the maximum length of point-to-point transmission arbitrarily, and the thickness of sheet metal and the ratio of its size equal the aspect ratio of microfissure;
If need the natural core of simulation to contain dissolution pore, according to the average-size of dissolution pore and quantity, the inorganic salt particle of screening same size and quantity;
(3) landwaste is mixed with epoxy resin adhesive; If the natural core of simulation contains dissolution pore, also to add again by the ready inorganic salt particle of step (2) and be mixed together evenly;
(4) before epoxy resin adhesive starts to solidify, the potpourri that step (3) is made adds in synthetic core mould; If the natural core of simulation contains crack, add potpourri in mould time, also should embed at random, uniformly by the ready sheet metal of step (2); Potpourri all adds after mould, exerts pressure, and after epoxy resin adhesive has solidified, form removal obtains synthetic core;
(5) if contain inorganic salt particle in synthetic core, first adopt distilled water to carry out leaching or immersion to synthetic core, after inorganic salt particle dissolves completely, stop leaching or immersion, form dissolution pore; If contain sheet metal in synthetic core, then adopt acid or alkali to carry out leaching or immersion to synthetic core, after sheet metal and acid or alkali reaction are complete, stop leaching or immersion, form crack;
(6) by distilled water leaching or immersion for synthetic core after treatment step (5), drier, obtain final rock core.
In the present invention, described sheet metal can with the acid or the alkali reaction that or not do not react landwaste, generate water-soluble salt and gas, be used for forming crack.The size of sheet metal refers to that the maximum length of any point-to-point transmission on sheet metal is (if disk refers to diameter; Ellipse slice, refers to major axis; Triangular piece, refers to longest edge; Quadrilateral sheet, refers to the diagonal line length of growing most).Described inorganic salt particle can be water-soluble, but do not participate in the curing reaction of epoxy resin, is used for forming dissolution pore.
According to the preparation method of the synthetic core of the multi-modal pore system structure of the embodiment of the present invention, using natural landwaste as synthetic core skeleton, adopt epoxy resin adhesive simulation cementing matter, between natural cutting grain, form interparticle pore; In synthetic core skeleton, embed sheet metal and (or) inorganic salt particle, and after synthetic core moulding, adopt leaching or infusion method that sheet metal and inorganic salt particle are dissolved, form crack and (or) the dissolution pore of hollow; Thereby make the synthetic core that comprises multi-modal pore system structure.The method can quantitatively be controlled crack and the dissolution pore parameter of rock core, and the synthetic core obtaining and natural core have good similarity, can meet simulation and the test of the physical propertys such as acoustic wave of rock, seepage flow, conduction.Convenient, favorable repeatability that the method is implemented, can be physical test of rock provide high-quality, at a low price, free of contamination experiment rock core, improve conventional efficient, reduce experimental period and cost.In addition, " multi-modal pore system " described in technical solution of the present invention, the implication of " hole " had both comprised interparticle pore, comprised again simulation all holes relevant with test of the physical propertys such as microfissure, crack, dissolution pore, mould pore etc. and acoustic wave of rock, seepage flow, conduction; Described " crack " comprising: microfissure, crack, the hole that aspect ratio is less than 0.1 such as shout, described " dissolution pore " comprising: the hole that the aspect ratios such as dissolution pore, mould pore are greater than 0.5.
In addition, can also there is following additional technical feature according to the preparation method of the synthetic core of the multi-modal pore system structure of the embodiment of the present invention:
Preferably, in described step (1), the quantity (n) of sheet metal is calculated according to the following formula:
In formula, ε represents the crack density of the natural core of needs simulation, and d represents the size of sheet metal, and V represents the volume of mould or the volume of synthetic core.
Preferably, in described step (3), landwaste and epoxy resin adhesive parts by weight are: the landwaste of 100 parts, 0.5～20 part of epoxy resin adhesive; Preferably 100 parts of landwaste, 1～5 part of epoxy resin adhesive.
Preferably, in described step (3), epoxy resin adhesive comprises epoxy resin, hardening agent and thinning agent, and epoxy resin is the bisphenol A type epoxy resin of epoxide number 0.25～0.45; The parts by weight of each component are 0.5～1 part of epoxy resin, 0.05～0.5 part, hardening agent, 0.1～1 part of thinning agent.
Preferably, while embedding sheet metal in described step (4), should keep sheet metal smooth as far as possible, avoid bending or overlapping; According to the situation of simulated actual rock core, while embedding sheet metal, can make the substantially parallel or random tilt profiles of all sheet metals.
Preferably, in described step (4), potpourri all adds after mould, applies axle pressure 0～15MPa, preferably 2～6MPa.
Preferably, in described step (5), adopt acid or alkali to carry out leaching or immersion to synthetic core, simulating common reservoir rock landwaste-sheet metal-leaching used (immersion) liquid is: carbonate rock detritus-aluminium foil-highly basic, sandstone landwaste-aluminium foil-highly basic or strong acid or sandstone landwaste-tagger-strong acid.
Preferably, inorganic salt particle described in described step (5) is that dissolved solution degree is greater than 20g/100gH
2the inorganic salts of O, such as sodium salt, sylvite, ammonium salt; Preferred inorganic salt particle is sodium chloride particle.Further preferably, adopt distilled water to carry out leaching or immersion to synthetic core, general solubleness distilled water temperature larger, that use is higher, inorganic salt particle is dissolved to the required time of formation dissolution pore completely shorter.
Preferably, described step (5) if in contain inorganic salt particle in synthetic core, first adopt distilled water to carry out leaching or immersion to synthetic core, weighed the quality of a synthetic core every 5 minutes, along with the continuous dissolving of inorganic salt particle, the quality of synthetic core is tending towards a stationary value gradually.When adjacent twice weighing result is less than 0.01g, can stop leaching or immersion.
Preferably, described step (5) if in contain sheet metal in synthetic core, then adopt acid or alkali to carry out leaching or immersion to synthetic core, emerge until no longer include bubble, stop leaching or immersion.
Preferably, also comprise the final rock core fracture aperture of gained (φ
c) and dissolution pore factor of porosity (φ
v) calculation procedure, can calculate according to following formula:
In formula, ρ
1for the density of sheet metal used; ρ
2for the density of inorganic salts used; m
1for the quality of sheet metal used; m
2for the quality of inorganic salt particle used; V is the volume of synthetic core.
The present invention protects the multi-modal pore system structure synthetic core that adopts above-mentioned preparation method to prepare on the other hand.
To sum up, the beneficial effect of multi-modal pore system structure synthetic core of the present invention and preparation method thereof is:
(1) framework material of synthetic core is natural landwaste, its multi-modal pore system structure is close with natural core, the hole, hole, the seam that form are all hollow, can be used in the rock Physical Experiments such as ultrasound wave, seepage flow, electric conductivity, provide the physical test of rock result that has more reference value, applied range;
(2) can accurately control size and the quantity of dissolution pore; Can more accurately control shape, size, opening width, the quantity of seam, seam can be parallel, can be also random inclination angle.The rock core obtaining has known crack density and aspect ratio, can carry out the quantitative test of acoustical testing result and seepage flow test result, for microscopic percolation mechanism, the acoustic wave character etc. of means announcement multi-modal pore system structure rock are laid a good foundation by experiment.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is sandstone and the carbonate rock detritus particle of different-grain diameter; (a1)-(a3) sandstone landwaste of different-grain diameter; (b1)-(b3) carbonate rock detritus of different-grain diameter;
Fig. 2 is different size aluminium foil; (a) d=3mm, h=0.02mm; (b) d=6mm, h=0.02mm; (c) d=8mm, h=0.02mm;
Fig. 3 is the sodium chloride particle of different-grain diameter; (a) d=1mm; (b) d=(3～4) mm; (c) d=(4～5) mm;
Fig. 4 is the SEM image of crack-porous sandstone synthetic core and diverse location thereof;
Fig. 5 is the CT scan composograph of dissolution pore-pore type carbonatite synthetic core and pore texture thereof;
Fig. 6 is the capillary pressure curve of crack-pore type dual pore structure synthetic core;
Fig. 7 is the capillary pressure curve of dissolution pore-pore type dual pore structure synthetic core.
Embodiment
Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
The screening of the natural landwaste of different lithology and particle diameter:
The lithology of the natural core of simulation, mineral composition and particle diameter distribute as required, screen the landwaste of corresponding lithology and particle diameter: select the purer natural sandstone of mineral composition or carbonatite (bulk or landwaste all can), obtain cutting grain by Mechanical Crushing, grinding, the screen cloth of employing different-grain diameter filters out the cutting grain of different-grain diameter distribution range, as shown in Figure 1, particle diameter is distributed as 0.05mm, 0.1mm, 0.2-0.4mm, 0.4-0.6mm, 0.6-0.9mm, 1mm.
The preparation of sheet metal and inorganic salt particle and screening:
Hole aspect ratio (AR) refers to the length ratio of hole minor axis and major axis, is the important parameter of describing pore shape.Choose the aluminium-foil paper that thickness is 0.02mm, adopt the card punch of different-diameter, it is 3mm that aluminium-foil paper is processed into diameter, 6mm, and the disk of 8mm, corresponding aspect ratio was 0.0067,0.0033,0.0025 (as shown in Figure 2).
Choose bulk sea salt, obtain sodium chloride particle by Mechanical Crushing, grinding, adopt the screen cloth of different-grain diameter, filter out the sodium chloride particle that different-grain diameter distributes.The particle diameter of sodium chloride particle shown in Fig. 3 is distributed as 1mm, (3～4) mm, (4～5) mm.
Embodiment 1
Taking preparation crack-porous sandstone synthetic core as example.Design synthetic core is of a size of diameter 25mm, length 50mm standard rock core, and volume V is 39.27cm
3, wherein microfissure size d is 3mm, and aspect ratio AR is 0.0067, and crack density ε is 0.0495.Preparation diameter d=3mm, totally 45 of the quantity n of the circular tagger of thickness h=0.02mm (AR=0.0067), the quality m of 45 taggers
1for 0.0496g, to simulate crack.Take the carbonate rock detritus 60g of particle diameter 200 μ m, epoxy resin 1.538g, hardening agent 0.462g, thinning agent 0.769g.Sandstone landwaste is mixed with epoxy resin adhesive.Potpourri average mark is joined in mould for 5 times, in this process, embed at random one by one in potpourri with tweezers gripping tagger.Synthetic core is prepared material and is all added after mould, and mould is put on axle pressure experiment frame, applies 6MPa axle pressure.Under normal temperature, after 12 hours, epoxy resin adhesive is fully curing, removes mould.Synthetic core is immersed in the hydrochloric acid solution that mass concentration is 3mol/L, emerges until no longer include bubble.After synthetic core takes out, dry after 6 hours with distilled water leaching.Fig. 4 is crack-pore type synthetic core of preparation and the SEM image in diverse location cross section, can find out from SEM image, and the synthetic core of acquisition contains interparticle pore and crack.Adopting helium porosity measurement instrument to record this TCP is 21.44%, obtains fracture aperture φ according to the Mass Calculation that adds tagger
cbe 0.0259%.
Embodiment 2
To prepare dissolution pore-pore type dual pore structure carbonatite synthetic core as example.Design rock core size diameter 25mm, length 50mm standard rock core; Dissolution pore size 3mm, dissolution pore quantity 75.75 of the sodium chloride particles of screening particle diameter 3mm, quality m
2for 4.35g.Take the carbonate rock detritus 60g of particle diameter 200 μ m, epoxy resin 0.923g, hardening agent 0.277g, thinning agent 0.462g.Carbonate rock detritus is mixed with epoxy resin adhesive, then add the sodium chloride particle filtering out, mix.Potpourri is added in mould, apply axle pressure 6MPa.Under normal temperature, after 12 hours, epoxy resin adhesive is fully curing, removes mould.In type synthetic core is immersed in the distilled water of 45 DEG C, weigh once per half an hour.After core quality is substantially constant, stop soaking, synthetic core takes out dry.Fig. 5 is dissolution pore-pore type synthetic core and the CT scan composograph (wherein containing the CT scan composograph of 6 width diverse locations) of preparation, can find out that from CT image the synthetic core obtaining contains interparticle pore and dissolution pore.Its total porosity of this rock core is 28.06%, obtains dissolution pore factor of porosity φ according to the Mass Calculation that adds sodium chloride particle
vbe 8.2%.
Embodiment 3
Taking preparation crack-dissolution pore-pore type multi-modal pore system structural carbon Carbonate Rocks synthetic core as example.Design rock core size diameter 25mm, length 50mm standard rock core; Wherein crack is of a size of 3mm, and aspect ratio is 0.0067, and crack density is 0.022; Dissolution pore size 2mm, dissolution pore quantity 135.Preparation diameter d=3mm, totally 20 of the quantity n of thickness h=0.02mm circular aluminum paillon foil (AR=0.0067), the quality m1 of 20 aluminium foils is 0.0076g, to simulate crack.135 of the sodium chloride particles of screening particle diameter 2mm, quality m2 is 2.33g, to simulate dissolution pore.Take the carbonate rock detritus 60g of particle diameter 200 μ m, epoxy resin 0.923g, hardening agent 0.277g, thinning agent 0.462g.Carbonate rock detritus is mixed with epoxy resin adhesive, then add the sodium chloride particle filtering out, mix.Potpourri average mark is joined in mould for 4 times, in this process, embed at random one by one in potpourri with tweezers gripping aluminium foil.Synthetic core is prepared material and is all added after mould, and mould is put on axle pressure experiment frame, applies 4MPa axle pressure.Under normal temperature, after 12 hours, epoxy resin adhesive is fully curing, removes mould.In type synthetic core is immersed in the distilled water of 60 DEG C, within every 15 minutes, weighs once.After core quality is substantially constant, stop soaking.Again synthetic core is immersed in to mass concentration and is in 4% sodium hydroxide solution, emerge until no longer include bubble.Finally dry after 6 hours with distilled water leaching, obtain crack-dissolution pore-interparticle pore type carbonatite synthetic core.This rock core fracture aperture is 0.0115%, and dissolution pore factor of porosity is 4.3651%, and it is 27.4259% that gas is surveyed total porosity, and interparticle porosity is 23.0493%.
Embodiment 4
Synthetic core prepared by embodiment 1 is the dry rock core of the saturation of the air, both ends of the surface is processed smooth, in be controlled at ± 0.05mm of the depth of parallelism, carries out the test of ultrasonic compressional, shear wave velocity.After having tested, synthetic core is saturated with distilled water, then carry out ultrasonic compressional, shear wave velocity test.After synthetic core is dry, synthetic core is saturated with kerosene, then carry out ultrasonic compressional, transverse wave testing.Above-mentioned ultrasonic investigation longitudinal frequency 0.5MHz, shear wave frequency 0.25MHz.Under different saturation conditionss, carry out ultrasonic investigation, result is as shown in table 1.Multi-modal pore system structure synthetic core can complete the sonic test under different condition.
The sonic test result of synthetic core in table 1 embodiment 1
| Saturated fluid | Velocity of longitudinal wave, m/s | Shear wave velocity, m/s |
| Air | 2805.92 | 1525.03 |
| Water | 2804.38 | 1213.66 |
| Kerosene | 2684.15 | 1614.39 |
Embodiment 5
Synthetic core prepared by embodiment 1 and embodiment 2 carries out capillary pressure curve test, and result respectively as shown in Figure 6, Figure 7.From Fig. 6, Fig. 7, can find out clearly the difference of the capillary pressure curve of different double pores system synthetic cores.
Embodiment 6
Synthetic core prepared by embodiment 1, adopts four electrode method to carry out resistivity measurement, and result is as shown in table 2.Multi-modal pore system structure synthetic core can complete the resistivity measurement under different condition.
The sonic test result of synthetic core in table 2 embodiment 3
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a preparation method for multi-modal pore system structure synthetic core, is characterized in that, comprises the following steps:
(1) prepare the landwaste corresponding with the natural core that needs simulation;
(2) prepare to prepare the material of simulating secondary pores in synthetic core, described secondary pores comprises one or both in crack, dissolution pore:
If need the natural core of simulation to contain crack, according to the average-size in crack and aspect ratio, the sheet metal of processing same size (d) and corresponding thickness (h), the crack density (ε) of simulation according to actual needs, determines the quantity (n) of required sheet metal; Wherein, the size of described sheet metal refers on sheet metal the maximum length of point-to-point transmission arbitrarily, and the thickness of sheet metal and the ratio of its size equal the aspect ratio in crack;
If need the natural core of simulation to contain dissolution pore, according to the average-size of dissolution pore and quantity, the inorganic salt particle of screening same size and quantity;
(3) landwaste is mixed with epoxy resin adhesive; If the natural core of simulation contains dissolution pore, also to add again by the ready inorganic salt particle of step (2) and be mixed together evenly;
(4) before epoxy resin adhesive starts to solidify, the potpourri that step (3) is made adds in synthetic core mould; If the natural core of simulation contains crack, add potpourri in mould time, also should embed at random, uniformly by the ready sheet metal of step (2); Potpourri all adds after mould, exerts pressure, and after epoxy resin adhesive has solidified, form removal obtains synthetic core;
(5) if contain inorganic salt particle in synthetic core, first adopt distilled water to carry out leaching or immersion to synthetic core, after inorganic salt particle dissolves completely, stop leaching or immersion, form dissolution pore; If contain sheet metal in synthetic core, then adopt acid or alkali to carry out leaching or immersion to synthetic core, after sheet metal and acid or alkali reaction are complete, stop leaching or immersion, form crack;
(6) by distilled water leaching or immersion for synthetic core after treatment step (5), drier, obtain final rock core.
2. preparation method according to claim 1, is characterized in that, in described step (1), the quantity (n) of sheet metal is calculated according to the following formula:
In formula, ε represents the crack density of the natural core of needs simulation, and d represents the size of sheet metal, and V represents the volume of mould or the volume of synthetic core.
3. preparation method according to claim 1, is characterized in that, in described step (3), landwaste and epoxy resin adhesive parts by weight are: the landwaste of 100 parts, 0.5～20 part of epoxy resin adhesive; Preferably 100 parts of landwaste, 1～5 part of epoxy resin adhesive.
4. according to the preparation method described in claim 1 or 3, it is characterized in that, in described step (3), epoxy resin adhesive comprises epoxy resin, hardening agent and thinning agent, and epoxy resin is the bisphenol A type epoxy resin of epoxide number 0.25～0.45; The parts by weight of each component are 0.5～1 part of epoxy resin, 0.05～0.5 part, hardening agent, 0.1～1 part of thinning agent.
5. preparation method according to claim 1, is characterized in that, while embedding sheet metal, should keep sheet metal smooth in described step (4) as far as possible, avoids bending or overlapping; According to the situation of simulated actual rock core, while embedding sheet metal, can make the substantially parallel or random tilt profiles of all sheet metals.
6. preparation method according to claim 1, is characterized in that, in described step (4), potpourri all adds after mould, applies axle pressure 0～15MPa, preferably 2～6MPa.
7. preparation method according to claim 1, it is characterized in that, in described step (5), adopt acid or alkali to carry out leaching or immersion to synthetic core, simulating common reservoir rock landwaste-sheet metal-leaching used (immersion) liquid is: carbonate rock detritus-aluminium foil-highly basic, sandstone landwaste-aluminium foil-highly basic or strong acid or sandstone landwaste-tagger-strong acid.
8. preparation method according to claim 1, is characterized in that, inorganic salt particle described in described step (5) is that dissolved solution degree is greater than 20g/100gH
2the inorganic salts of O, such as sodium salt, sylvite, ammonium salt; Preferred inorganic salt particle is sodium chloride particle.
9. preparation method according to claim 1, is characterized in that, also comprises the final rock core fracture aperture of gained (φ
c) and dissolution pore factor of porosity (φ
v) calculation procedure, can calculate according to following formula:
In formula, ρ
1for the density of sheet metal used; ρ
2for the density of inorganic salts used; m
1for the quality of sheet metal used; m
2for the quality of inorganic salt particle used; V is the volume of synthetic core.
10. the multi-modal pore system structure synthetic core that prepared by the preparation method as described in claim 1-9 any one.
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