CN104089806B - A kind of multi-modal pore system structural artificial rock core and preparation method thereof - Google Patents
A kind of multi-modal pore system structural artificial rock core and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of multi-modal pore system structural artificial rock core and preparation method thereof, step is: prepare landwaste, inorganic salt particle and sheet metal; Landwaste is mixed with epoxy resin adhesive; When adding potpourri in mould, embed the inorganic salt particle designed and (or) sheet metal at random; Solidification; Synthetic core is taken out in form removal, uses distilled water immersion rock core, and dissolve inorganic salts particle forms dissolution pore; Soak or leaching rock core with the acid of correspondence or alkali, form crack; Finally by synthetic core distilled water flushing, after dry, obtain multi-modal pore system structural artificial rock core.The synthetic core of this invention can the crack of fixing quantity rock core and dissolution pore parameter, the synthetic core obtained and natural core have good similarity, and the simulation and the test that can be the physical propertys such as acoustic wave of rock, seepage flow, conduction provide high-quality, low cost, free of contamination experiment material.
Description
Technical field
The present invention relates to a kind of synthetic core of simulating porous rock and preparation method thereof, belong to analysis 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 validity of different raising rate of oil and gas recovery technology (as surfactant flooding, water drive, polymer flooding etc.) for multi-modal pore system structure reservoir.
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. are secondary pores.The pore network of these dissimilar hole compositions is important hydrocarbon pore volume and seepage channel.Multi-modal pore system structure refers to simultaneously containing two or more porosity type, such as crack-pore type, solution cavity-pore type etc.Containing the reservoir of oil and gas that the rock of multi-modal pore system structure is favourable often, the physical property (acoustic wave character, seepage characteristic and electrical characteristics) of research multi-modal pore system rock is significant for oil exploration and exploitation.
Experiment test is the most direct method of research multi-modal pore system structure petrophysical property.True core is adopted to carry out the character of the physical testing energy true reflection underground hydrocarbon reservoirs such as acoustic velocity, permeability, conductivity, but multi-modal pore system structure rock shows very strong nonuniformity, anisotropy and multiple dimensioned property, be difficult to obtain representative natural core.In addition, underground cost of coring is high, and quality of coring not easily ensures; 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 property such as seepage flow, sound wave, conductivity of research multi-modal pore system structure rock, needs to adopt the rock core of known pore texture to carry out a large amount of experiment tests.Preparing multi-modal pore system structural artificial rock core is basis that is economic, that carry out petrophysics experiment efficiently.Synthetic core wants skeleton and the pore texture of feasible simulation true core.Pore components (aspect ratio is called for short AR) and characteristic dimension are two important parameters characterizing pore shape.Pore components 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 only containing interparticle pore, as conventional sandstone, its Artificial Core Making technique comparative maturity: according to factor of porosity, the permeability situation of reservoir sandstone, the silica sand choosing suitable particle diameter, as rock skeleton, mixes with jointing compound, and compacting is cementing, between quartz sand particle, form the interparticle pore of hollow, the synthetic core made can be used for the experiment test of different physical properties.But for except interparticle pore, the multi-modal pore system structure rock also containing 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 made often can only be used for the experiment test of a certain physical property.
Multi-modal pore system structural artificial rock core preparation method for sonic test reports more, such as sheet combination 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: the acoustic characteristic of (1) synthetic core skeleton and true core difference are comparatively large, and analog result needs could be used for engineering reality according to after theoretical model conversion, and whether this conversion rationally needs to be inquired into; (2) pore-size adjustment is subject to a definite 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, 201310022534.X), the method adopts landwaste and epoxy resin adhesive to construct synthetic core skeleton, soft rubber sheet or the plastic sheet simulation secondary pores of different size and shape is embedded in skeleton, in acoustic characteristic, effectively can simulate multi-pore media, but the experiment test of the characteristic such as seepage flow, conductivity cannot be used for.
For the preparation of the multi-modal pore system structural artificial rock core of Seepage Experiment mainly based on photoengraving glass plate method (Guo Shang equality, 1990), etch different cracks more on this basis.Hole-fissured structure the seepage flow of the method simulating two-dimensional, the physical model made can not carry out the experiment test of the characteristic such as acoustics, conductivity.
For the synthetic core of electric conduction of rock characteristic research or physical model report less, generally all adopt true core or conventional artificial's rock core; At present, the multi-modal pore system structural artificial rock core for conductive characteristic research is not yet seen in report.
Comprising the crack of hollow or dissolution pore in synthetic core is can simultaneously for basic demand that sound wave, seepage flow, electrical characteristics etc. are tested.Crack or the dissolution pore of current formation hollow mainly contain two class methods: one is before rock core is shaping, insert sheet metal extract again, forms crack; The method can only form the crack running through rock core, and the opportunity of inserting and extracting sheet metal is difficult to control, and success ratio is lower.Another kind method puts into certain material in advance in rock core, after rock core is shaped, forms hollow by physical method; Such as put into camphor sheet to heat again and make it volatilize, put into rosin etc. and use organic solvent dissolution again.The method can better control 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 adopted in preparation process has harm to health and Environmental security.
Summary of the invention
The present invention is intended at least to solve one of technical matters existed in prior art.
To achieve these goals, propose a kind of preparation method of multi-modal pore system structural artificial rock core according to an aspect of the present invention, comprise the following steps:
(1) landwaste corresponding with the natural core needing to simulate is prepared;
(2) prepare to prepare in synthetic core the material of simulating secondary pores, described secondary pores comprise in crack, dissolution pore one or both:
If need the natural core of simulation to contain crack, according to average-size and the aspect ratio in crack, the sheet metal of processing same size (d) and corresponding thickness (h), the fracture density (ε) simulated according to actual needs, determines the quantity (n) of required sheet metal; Wherein, the size of described sheet metal refers to the maximum length of any point-to-point transmission on sheet metal, and the thickness of sheet metal equals the aspect ratio of microfissure with the ratio of its size;
If need the natural core of simulation to contain dissolution pore, according to average-size and the quantity of dissolution pore, 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 and be mixed together evenly by step (2) ready inorganic salt particle;
(4) before epoxy resin adhesive starts solidification, the potpourri that step (3) is obtained adds in synthetic core mould; If the natural core of simulation contains crack, when adding potpourri in mould, also should embed at random, uniformly by step (2) ready sheet metal; After potpourri all adds mould, exert pressure, after epoxy resin adhesive has solidified, form removal has obtained synthetic core;
(5) if containing inorganic salt particle in synthetic core, first adopt distilled water to carry out leaching or immersion to synthetic core, dissolve completely until inorganic salt particle, stop leaching or immersion, form dissolution pore; If containing sheet metal in synthetic core, then adopt acid or alkali to carry out leaching or immersion to synthetic core, sheet metal and acid or alkali reaction completely after, stop leaching or immersion, form crack;
(6) synthetic core distilled water leaching or immersion after step (5) being processed, drier, obtain final rock core.
In the present invention, described sheet metal can with the acid of or not reacting landwaste or alkali reaction, generate water-soluble salt and gas, be used for formed crack.The size of sheet metal refers to that the maximum length of any point-to-point transmission on sheet metal (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 grown 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 is shaping, adopts leaching or infusion method sheet metal and inorganic salt particle to be dissolved, form crack and (or) the dissolution pore of hollow; Thus make the synthetic core comprising multi-modal pore system structure.The method can the crack of fixing quantity rock core and dissolution pore parameter, and the synthetic core of acquisition 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, the implication of " multi-modal pore system ", " hole " that describe in technical solution of the present invention both comprised interparticle pore, comprised again all holes that the simulation of the physical propertys such as microfissure, crack, dissolution pore, mould pore etc. and acoustic wave of rock, seepage flow, conduction is relevant with test; Described " crack " comprising: the hole that the aspect ratios such as microfissure, crack, throat are less than 0.1, and described " dissolution pore " comprising: the hole that the aspect ratio such as dissolution pore, mould pore is greater than 0.5.
In addition, following additional technical feature can also be had 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 calculates according to the following formula:
In formula, ε represents the fracture density of the natural core that needs are simulated, 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; Preferred landwaste 100 parts, epoxy resin adhesive 1 ~ 5 part.
Preferably, described step (3) epoxy resin system jointing compound 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 epoxy resin 0.5 ~ 1 part, 0.05 ~ 0.5 part, hardening agent, thinning agent 0.1 ~ 1 part.
Preferably, when embedding sheet metal in described step (4), should sheet metal be kept smooth as far as possible, avoid bending or overlapping; According to the situation of simulated actual rock core, when embedding sheet metal, the substantially parallel or random tilt profiles of all sheet metals can be made.
Preferably, after potpourri all adds mould in described step (4), apply axle pressure 0 ~ 15MPa, preferably 2 ~ 6MPa.
Preferably, acid or alkali is adopted to carry out leaching or immersion to synthetic core in described step (5), simulating common reservoir rock landwaste used-sheet metal-leaching (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 that is larger, that use is higher, and it is shorter inorganic salt particle to be dissolved completely the time of formation needed for dissolution pore.
Preferably, described step (5) if in synthetic core containing inorganic salt particle, distilled water is first adopted to carry out leaching or immersion to synthetic core, the quality of a synthetic core is weighed 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, leaching or immersion can be stopped.
Preferably, described step (5) if in synthetic core containing sheet metal, 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 according to following formulae discovery:
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 structural artificial rock core adopting above-mentioned preparation method to prepare on the other hand.
To sum up, the beneficial effect of multi-modal pore system structural artificial rock 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 formed, hole, seam are all hollow, can be used in the petrophysics experiment such as ultrasound wave, seepage flow, electric conductivity, there is provided the physical test of rock result having more reference value, applied range;
(2) size and the quantity of dissolution pore can accurately be controlled; More accurately can control shape, size, opening width, the quantity of stitching, seam can be parallel, also can be random inclination angle.The rock core obtained has known fracture density and aspect ratio, can carry out the quantitative test of acoustical testing result and seepage flow test result, and the microscopic percolation mechanism, acoustic wave character etc. that disclose multi-modal pore system structure rock for means are by experiment laid a good foundation.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is sandstone and the carbonate rock detritus particle of different-grain diameter; (a1)-(a3) the 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
Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
The screening of the natural landwaste of different lithology and particle diameter:
The lithology of the natural core of simulating as required, mineral composition and domain size distribution, screen the landwaste of corresponding lithology and particle diameter: the natural sandstone selecting mineral composition purer or carbonatite (block or landwaste), obtain cutting grain by Mechanical Crushing, grinding, adopt the screen cloth of different-grain diameter to filter out the cutting grain of different-grain diameter distribution range, as shown in Figure 1, domain size distribution is 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:
Pore components (AR) refers to the length ratio of hole minor axis and major axis, is the important parameter describing pore shape.Choose the aluminium-foil paper that thickness is 0.02mm, adopt the card punch of different-diameter, aluminium-foil paper is processed into the disk that diameter is 3mm, 6mm, 8mm, corresponding aspect ratio is 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 of different-grain diameter distribution.The domain size distribution of sodium chloride particle shown in Fig. 3 is 1mm, (3 ~ 4) mm, (4 ~ 5) mm.
Embodiment 1
To prepare crack-porous sandstone synthetic core.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, aspect ratio AR be 0.0067, fracture density ε is 0.0495.The quantity n totally 45 of the circular tagger (AR=0.0067) of preparation diameter d=3mm, thickness h=0.02mm, the quality m of 45 taggers
1for 0.0496g, to simulate crack.Take the carbonate rock detritus 60g of particle diameter 200 μm, 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 5 times, in the process, embeds at random one by one in potpourri with tweezers gripping tagger.Synthetic core is prepared after material all adds mould, is put into by mould on axle pressure experiment frame, applies 6MPa axle pressure.Under normal temperature, after 12 hours, epoxy resin adhesive fully solidifies, and removes mould.Synthetic core being immersed in mass concentration is in the hydrochloric acid solution of 3mol/L, emerges until no longer include bubble.After synthetic core takes out, dry after 6 hours with distilled water leaching.Fig. 4 is the crack-pore type synthetic core of preparation and the SEM image in diverse location cross section, and as can be seen from SEM image, 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 adding tagger
cbe 0.0259%.
Embodiment 2
To prepare dissolution pore-pore type dual pore structure carbonatite synthetic core.Design rock core size diameter 25mm, length 50mm standard rock core; Dissolution pore size 3mm, dissolution pore quantity 75.The sodium chloride particle 75 of screening particle diameter 3mm, quality m
2for 4.35g.Take the carbonate rock detritus 60g of particle diameter 200 μm, epoxy resin 0.923g, hardening agent 0.277g, thinning agent 0.462g.Carbonate rock detritus is mixed with epoxy resin adhesive, then adds the sodium chloride particle filtered out, mix.Potpourri is added in mould, apply axle pressure 6MPa.Under normal temperature, after 12 hours, epoxy resin adhesive fully solidifies, and removes mould.Be immersed in by type synthetic core in the distilled water of 45 DEG C, per half an hour weighs once.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 (the CT scan composographs wherein containing 6 width diverse locations) of preparation, can find out that the synthetic core obtained contains interparticle pore and dissolution pore from CT image.Its total porosity of this rock core is 28.06%, obtains dissolution pore factor of porosity φ according to the Mass Calculation adding sodium chloride particle
vbe 8.2%.
Embodiment 3
To prepare crack-dissolution pore-pore type multi-modal pore system structural carbon Carbonate Rocks synthetic core.Design rock core size diameter 25mm, length 50mm standard rock core; Wherein slot dimensions is 3mm, and aspect ratio is 0.0067, and fracture density is 0.022; Dissolution pore size 2mm, dissolution pore quantity 135.Preparation diameter d=3mm, the quantity n of thickness h=0.02mm circular aluminum paillon foil (AR=0.0067) totally 20, the quality m1 of 20 aluminium foils is 0.0076g, to simulate crack.The sodium chloride particle 135 of screening particle diameter 2mm, quality m2 is 2.33g, to simulate dissolution pore.Take the carbonate rock detritus 60g of particle diameter 200 μm, epoxy resin 0.923g, hardening agent 0.277g, thinning agent 0.462g.Carbonate rock detritus is mixed with epoxy resin adhesive, then adds the sodium chloride particle filtered out, mix.Potpourri average mark is joined in mould 4 times, in the process, embeds at random one by one in potpourri with tweezers gripping aluminium foil.Synthetic core is prepared after material all adds mould, is put into by mould on axle pressure experiment frame, applies 4MPa axle pressure.Under normal temperature, after 12 hours, epoxy resin adhesive fully solidifies, and 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.Synthetic core being immersed in mass concentration is in the sodium hydroxide solution of 4% again, emerges until no longer include bubble.Finally use distilled water leaching dry after 6 hours, 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 surveys total porosity, and interparticle porosity is 23.0493%.
Embodiment 4
Synthetic core embodiment 1 prepared is the dry rock core of the saturation of the air, both ends of the surface is processed smooth, and the depth of parallelism controls, within ± 0.05mm, to carry out the test of ultrasound wave P-and S-wave velocity.After having tested, by saturated for synthetic core distilled water, then carry out the test of ultrasound wave P-and S-wave velocity.After synthetic core drying, by saturated for synthetic core kerosene, then carry out ultrasonic compressional, transverse wave testing.Above-mentioned ultrasonic investigation longitudinal frequency 0.5MHz, shear wave frequency 0.25MHz.Carry out ultrasonic investigation under different saturation conditions, result is as shown in table 1.Multi-modal pore system structural artificial rock 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 is carried out capillary pressure curve test, and result respectively as shown in Figure 6, Figure 7.The difference of the capillary pressure curve of different double pores system synthetic core can be found out clearly from Fig. 6, Fig. 7.
Embodiment 6
By synthetic core prepared by embodiment 1, adopt four electrode method to carry out resistivity measurement, result is as shown in table 2.Multi-modal pore system structural artificial rock core can complete the resistivity measurement under different condition.
The sonic test result of synthetic core in table 2 embodiment 3
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (14)
1. a preparation method for multi-modal pore system structural artificial rock core, is characterized in that, comprises the following steps:
(1) landwaste corresponding with the natural core needing to simulate is prepared;
(2) prepare to prepare in synthetic core the material of simulating secondary pores, described secondary pores comprise in crack, dissolution pore one or both:
If need the natural core of simulation to contain crack, according to average-size and the aspect ratio in crack, processing same size (
d) and corresponding thickness (
h) sheet metal, the fracture density simulated according to actual needs (
ε), determine the quantity (n) of required sheet metal; Wherein, the size of described sheet metal refers to the maximum length of any point-to-point transmission on sheet metal, and the thickness of sheet metal equals the aspect ratio in crack with the ratio of its size;
If need the natural core of simulation to contain dissolution pore, according to average-size and the quantity of dissolution pore, 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 and be mixed together evenly by step (2) ready inorganic salt particle;
(4) before epoxy resin adhesive starts solidification, the potpourri that step (3) is obtained adds in synthetic core mould; If the natural core of simulation contains crack, when adding potpourri in mould, also should embed at random, uniformly by step (2) ready sheet metal; After potpourri all adds mould, exert pressure, after epoxy resin adhesive has solidified, form removal has obtained synthetic core;
(5) if containing inorganic salt particle in synthetic core, first adopt distilled water to carry out leaching or immersion to synthetic core, dissolve completely until inorganic salt particle, stop leaching or immersion, form dissolution pore; If containing sheet metal in synthetic core, then adopt acid or alkali to carry out leaching or immersion to synthetic core, sheet metal and acid or alkali reaction completely after, stop leaching or immersion, form crack;
(6) synthetic core distilled water leaching or immersion after step (5) being processed, drier, obtain final rock core.
2. preparation method according to claim 1, is characterized in that, in described step (1) sheet metal quantity (
n) calculate according to the following formula:
In formula,
εrepresent the fracture density of the natural core needing simulation,
drepresent the size of sheet metal,
vrepresent 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.
4. preparation method according to claim 3, is characterized in that, in described step (3), landwaste and epoxy resin adhesive parts by weight are: landwaste 100 parts, epoxy resin adhesive 1 ~ 5 part.
5. the preparation method according to claim 1 or 3, is characterized in that, described step (3) epoxy resin system jointing compound 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 epoxy resin 0.5 ~ 1 part, 0.05 ~ 0.5 part, hardening agent, thinning agent 0.1 ~ 1 part.
6. preparation method according to claim 1, is characterized in that, when embedding sheet metal in described step (4), should sheet metal be kept smooth as far as possible, avoids bending or overlapping; According to the situation of simulated actual rock core, when embedding sheet metal, the substantially parallel or random tilt profiles of all sheet metals can be made.
7. preparation method according to claim 1, is characterized in that, after potpourri all adds mould in described step (4), applies axle pressure 0 ~ 15MPa.
8. preparation method according to claim 7, is characterized in that, described axle pressure is 2 ~ 6MPa.
9. preparation method according to claim 1, it is characterized in that, acid or alkali is adopted to carry out leaching or immersion to synthetic core in described step (5), simulating common reservoir rock landwaste used-sheet metal-leaching (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.
10. 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.
11. preparation methods according to claim 10, is characterized in that, described inorganic salts are sodium salt, sylvite or ammonium salt.
12. preparation methods according to claim 10, is characterized in that, described inorganic salts are sodium chloride particle.
13. preparation methods according to claim 1, is characterized in that, also comprise to the final rock core fracture aperture of gained (
φ c) and dissolution pore factor of porosity (
φ v) calculation procedure, can according to following formulae discovery:
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;
vfor the volume of synthetic core.
Multi-modal pore system structural artificial rock core prepared by 14. preparation methods as described in any one of claim 1-13.
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| CN104568544B (en) * | 2015-01-14 | 2017-02-22 | 三峡大学 | Method for preparing inner air bubble-containing rock sample in rock sample visualization experiment |
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