CN108918214A - Conglomerate sample preparation method for core analysis and conglomerate sample for core analysis - Google Patents
Conglomerate sample preparation method for core analysis and conglomerate sample for core analysis Download PDFInfo
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- CN108918214A CN108918214A CN201810473636.6A CN201810473636A CN108918214A CN 108918214 A CN108918214 A CN 108918214A CN 201810473636 A CN201810473636 A CN 201810473636A CN 108918214 A CN108918214 A CN 108918214A
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- 238000004458 analytical method Methods 0.000 title claims abstract description 68
- 238000005464 sample preparation method Methods 0.000 title claims abstract description 35
- 239000003822 epoxy resin Substances 0.000 claims abstract description 106
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 106
- 230000001681 protective effect Effects 0.000 claims abstract description 62
- 238000005520 cutting process Methods 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 239000011435 rock Substances 0.000 claims description 144
- 239000003292 glue Substances 0.000 claims description 14
- 239000003350 kerosene Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002826 coolant Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- 238000011156 evaluation Methods 0.000 abstract description 6
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 238000004382 potting Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a conglomerate sample preparation method for core analysis and a conglomerate sample for core analysis, and relates to the field of laboratory core analysis, wherein the preparation method comprises the following steps: step 1, observing a conglomerate core to be detected, and determining two end surfaces of the conglomerate core; step 2, embedding the epoxy resin outside the conglomerate core and curing to form a first epoxy resin protective sleeve; step 3, cutting two ends of the conglomerate core along a direction parallel to the end face, and enabling two ends of the conglomerate core to expose fresh cores respectively to form core cutting faces; step 4, respectively installing a flow guide device on the two core cutting surfaces, wherein the flow guide device comprises a flow guide sheet and a flow guide joint; and 5, embedding the epoxy resin outside the first epoxy resin protective sleeve and the two flow deflectors and curing to form a second epoxy resin protective sleeve. The invention can effectively prevent the problems of particle falling, cracking and the like of the conglomerate sample in the experimental process, and provides technical support for conglomerate reservoir evaluation and seepage mechanism.
Description
Technical field
The present invention relates to laboratory core-analysis field, in particular to a kind of conglomerate sample preparation side for core analysis
Method and conglomerate sample for core analysis.
Background technique
As the important kind of China's oil and gas reservoir, conglomerate is the main object of geologist's research, especially in the recent period, companion
With the hair in the Junggar Basin ring Ma lake area area conglomerate great You and Bohai gulf basin Dongying Depression north slope conglomerate scale reserves area
It is existing, become important field of research by the coarse grain sedimentary system of core of conglomerate.
Core analysis is the basis of evaluating reservoir, and in terms of laboratory research, core analysis mainly includes Physical Property Analysis, oil-containing
Saturation analysis mutually seeps experimental analysis etc., therefore result of core analysis is not only the preferred important evidence of Favorable Reservoir, Er Qieguan
It is to oil and gas resource evaluation, therefore by common concern.
Currently, core analysis requires sample to have well-regulated shape, according to oil and gas industry standard SY/T 5336-
2006, general is mostly the small column that diameter is 2.54cm or 3.8cm.Conglomerate Reservoir is different from conventional sandstone reservoir, due to
The problems such as granularity is big, the miscellaneous base content of shale is high, causes Conglomerate Reservoir than more loose, easily falls grain, ruptures, causes the diameter to be
The extremely difficult preparation of plunger sample of 2.54cm or 3.8cm, while confining pressure can not be also loaded in experimentation, therefore how to prepare and meet
The sample that core analysis requires becomes the problem of puzzlement conglomerate evaluation.
Using specific chemical substance to sample carry out it is cementing be current mainstream conglomerate sample manufacturing method, wherein commonly using
Cementing agent include epoxy resin, 502 glue or paraffin, operating process is relatively easy, and sample is usually placed in cementing agent
In, after cementing agent is fully cured, sample taking-up is used for sample analysis.But the above method has very big defect：
Firstly, cementing agent to sample have very strong permeability, especially 502 glue and paraffin, into sample after can block up
A part of pore throat space is filled in, result of core analysis is influenced；
Secondly, cementing agent has carried out comprehensive curing process to sample, since cementing agent and the presence of rock core mechanical property are poor
It is different, cause rock core end face to be easy to produce crack under stress.Epoxy resin to the embedding effect of sample better than 502 glue with
Paraffin, but after epoxy resin embedding when sample progress oil-water displacement experiment, since clamper both ends are rigid plug, endface ring
The displacement and deformation of different scale can occur under high pressure for oxygen resin and rock core, lead to sample broke.
Based on this, this invention is intended to create a kind of conglomerate sample preparation methods for core analysis and for rock core point
The conglomerate sample of analysis, to overcome defect of the existing technology.
Summary of the invention
The purpose of the present invention is to provide a kind of conglomerate sample preparation methods for core analysis and it is used for core analysis
Conglomerate sample, can effectively prevent experimentation pebblestone sample fall grain, rupture the problems such as, be evaluation of conglomerate reservoir and seep
It flows mechanism and technical support is provided.
In order to achieve the above objectives, the present invention proposes a kind of conglomerate sample preparation methods for core analysis, wherein described
Preparation method includes：
Step 1, conglomerate rock core to be measured is observed, determines that two end faces of the conglomerate rock core, two end faces are parallel
Setting；
Step 2, make epoxy resin embedding outside the conglomerate rock core and be formed by curing the first epoxy resin protective case；
Step 3, the both ends that the conglomerate rock core is cut along the direction for being parallel to the end face, make the two of the conglomerate rock core
Expose fresh rock core respectively and form rock core cut surface in end；
Step 4, guiding device is installed respectively on two rock core cut surfaces, the guiding device includes flow deflector
With flow guiding connector, it is fixedly connected with a surface of the flow deflector with the rock core cut surface, another surface of the flow deflector
It is installed with the flow guiding connector, the through hole being connected to the flow guiding connector is offered on the flow deflector；
Step 5, make epoxy resin embedding outside the first epoxy resin protective case and outside two flow deflectors and admittedly
Change and form the second epoxy resin protective case, the flow guiding connector runs through the second epoxy resin protective case.
The conglomerate sample preparation methods as described above for being used for core analysis, wherein further include measuring in the step 1
The end face obtains the circumscribed diameter of a circle of maximum of the end face.
The conglomerate sample preparation methods as described above for being used for core analysis, wherein the first epoxy resin protective case
Outer diameter be greater than the circumscribed diameter of a circle 2mm of the maximum.
The as described above conglomerate sample preparation methods for being used for core analysis, wherein the flow deflector is in disc-shaped, and institute
The diameter for stating flow deflector is the 60%~80% of the first epoxy resin protective case outer diameter.
The as described above conglomerate sample preparation methods for being used for core analysis, wherein the step 2 includes：
Step 21, epoxy resin is melted in 120 DEG C, is injected after being down to 20 DEG C in phase embedding container；
Step 22, curing agent is added into epoxy resin, and stirs evenly；
Step 23, the conglomerate rock core is put into the phase embedding container, makes end face and the institute of the conglomerate rock core
The axis for stating phase embedding container is vertically arranged, and guarantees that the conglomerate rock core is submerged by epoxy resin completely；
Step 24, the epoxy resin completes to be formed by curing at normal temperature the first epoxy resin protective case, when solidification
Between be 48 hours.
The as described above conglomerate sample preparation methods for being used for core analysis, wherein in the step 3, when cutting makes
Use aviation kerosine as cooling medium；After the completion of cutting, with filter paper by the aviation kerosine wiped clean of the rock core cut surface, then
The conglomerate rock core after cutting is placed in baking oven, the temperature 70 C of the baking oven, the heating time 15 of the baking oven are set
Minute.
The conglomerate sample preparation methods as described above for being used for core analysis, wherein in the step 4, the water conservancy diversion
The outer rim of piece is hermetically connect by sealing glue with the rock core cut surface or the first epoxy resin protective case.
The conglomerate sample preparation methods as described above for being used for core analysis, wherein the sealing glue highest tolerance temperature
Degree is not less than 120 DEG C, and the highest proof pressure of the sealing glue is not less than 50MPa.
The conglomerate sample preparation methods as described above for being used for core analysis, wherein the flow deflector is cut with the rock core
It is fixedly connected between face by fixed screw.
The present invention also proposes a kind of conglomerate sample for core analysis, by the gravel for being used for core analysis as described above
Rock sample preparation methods are prepared, wherein the conglomerate sample for core analysis includes successively being arranged from inside to outside：
Conglomerate rock core, is in the form of a column, and the both ends of the conglomerate rock core are separately installed with flow deflector, the flow deflector along perpendicular to
The axis of the conglomerate rock core is arranged, and the flow deflector has towards the first surface of the conglomerate rock core and backwards to the conglomerate
The second surface of rock core, the first surface are fixedly connected with the end face of the conglomerate rock core, and the second surface, which is installed with, leads
Flow connector, the flow guiding connector in a tubular form and the diversion cavity that there is the axis along the flow guiding connector to penetrate through, on the flow deflector
Offer the through hole with the flow guiding connector corresponding matching；
First epoxy resin protective case is set in outside the conglomerate rock core, the inner wall of the first epoxy resin protective case
It is hermetically connect with the outer wall of the conglomerate rock core；
Second epoxy resin protective case is set in outside the first epoxy resin protective case, and second epoxy resin is protected
The inner wall of sheath is hermetically connect with the outer wall of the first epoxy resin protective case, and the two of the second epoxy resin protective case
End is all closed and is formed closure part, and the closure part is hermetically connect with the flow deflector, and the flow guiding connector runs through the envelope
Stifled portion.
Compared with prior art, the invention has the characteristics that and advantage：
Conglomerate sample preparation methods proposed by the present invention for core analysis and the gravel sample for core analysis, benefit
Conglomerate rock core is protected substantially with the first epoxy resin protective case, using the second epoxy resin protective case by guiding device with
Conglomerate rock core is embedded and is combined together completely, makes all epoxy resin of its pressure-bearing surface of conglomerate sample after the completion of preparation, this
Sample, guiding device is consistent with conglomerate rock core stress, ensure that the Balance of whole system, effectively prevent high-potting process
The rupture of middle sample.
Using the conglomerate sample preparation methods proposed by the present invention for core analysis to the miscellaneous base of clay, tufaceous content compared with
Conglomerate rock core that is high, easily loose, falling grain or ruptured carries out pre-processing, can effectively prevent experimentation pebblestone sample
The problems such as falling grain, rupture provides technical support for evaluation of conglomerate reservoir and seepage flow mechanism.
Conglomerate sample preparation methods proposed by the present invention for core analysis, are installed with water conservancy diversion on rock core cut surface
Piece avoids Fluid pressure from being applied directly to the rock core cut surface of loose easy fracture using the pressure of the evenly dispersed fluid of flow deflector,
The damage of conglomerate rock core during the experiment is avoided to greatest extent.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.
Fig. 1 is the flow chart in the present invention for the conglomerate sample preparation methods of core analysis；
Fig. 2 is the structural schematic diagram in the present invention for the conglomerate sample of core analysis；
Fig. 3 is the cross-sectional view in the present invention for the conglomerate sample of core analysis；
Fig. 4 is the longitudal section figure in the present invention for the conglomerate sample of core analysis.
Description of symbols：
100, for the conglomerate sample of core analysis；10, conglomerate rock core；
20, the first epoxy resin protective case；30, the second epoxy resin protective case；
40, flow deflector；50, flow guiding connector；
60, fixed screw.
Specific embodiment
With reference to the drawings and the description of the specific embodiments of the present invention, details of the invention can clearly be understood.But
It is the specific embodiment of invention described herein, purpose for explaining only the invention, and cannot understand in any way
At being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that based on any possible change of the invention
Shape, these are regarded as belonging to the scope of the present invention.
As shown in Figure 1, the conglomerate sample preparation methods proposed by the present invention for core analysis include：
Step 1, conglomerate rock core 10 to be determined is observed, determines two end faces (inlet end face and outlets of conglomerate rock core 10
End face), two end faces are arranged in parallel；
Step 2, make epoxy resin embedding outer in conglomerate rock core 10 and be formed by curing the first epoxy resin protective case 20；
Step 3, along the both ends for the direction cutting conglomerate rock core 10 for being parallel to end face, reveal the both ends of conglomerate rock core 10 respectively
Fresh rock core forms rock core cut surface out；
Step 4, guiding device is installed respectively on two rock core cut surfaces, guiding device includes that flow deflector 40 connects with water conservancy diversion
First 50, it is fixedly connected with a surface of flow deflector 40 with rock core cut surface, another surface of flow deflector 40 is installed with flow guiding connector
50, the through hole being connected to flow guiding connector 50 is offered on flow deflector 40；
Step 5, make epoxy resin embedding outer outer with two flow deflectors 40 in the first epoxy resin protective case 20 and solidify shape
At the second epoxy resin protective case 30, flow guiding connector 50 runs through the second epoxy resin protective case 30.
Conglomerate sample preparation methods proposed by the present invention for core analysis, it is right using the first epoxy resin protective case 20
Conglomerate rock core 10 is protected substantially, is embedded guiding device and conglomerate rock core 10 completely using the second epoxy resin protective case 30
And be combined together, make all epoxy resin of its pressure-bearing surface of conglomerate sample after the completion of preparation, in this way, guiding device and conglomerate
Rock core stress is consistent, ensure that the Balance of whole system, effectively prevent the rupture of sample during high-potting.
Using the conglomerate sample preparation methods proposed by the present invention for core analysis to the miscellaneous base of clay, tufaceous content compared with
Conglomerate rock core that is high, easily loose, falling grain or ruptured carries out pre-processing, can effectively prevent experimentation pebblestone sample
The problems such as falling grain, rupture provides technical support for evaluation of conglomerate reservoir and seepage flow mechanism.
Conglomerate sample preparation methods proposed by the present invention for core analysis, are installed with flow deflector on rock core cut surface
40, using the pressure of the evenly dispersed fluid of flow deflector 40, Fluid pressure is avoided to be applied directly to the rock core cutting of loose easy fracture
Face avoids the damage of conglomerate rock core during the experiment to greatest extent.
In an optional example of the invention, in step 1, conglomerate rock core to be determined is observed, determines conglomerate rock core
The specific operation process of two end faces (inlet end and an outlet end) can be according to specific core analysis project demand and stone
Oily Gas Industry standard requirements, are realized using the prior art, herein without repeating.
It in an optional example of the invention, further include utilizing vernier caliper measurement conglomerate rock core end face in step 1
Rock core size obtains the circumscribed diameter of a circle of maximum of end face.
Further, the container (phase embedding container for epoxy resin embedding is determined according to maximum circumscribed diameter of a circle
Embed container with the second phase) size, phase embedding container and second phase embedding container are the container with cylindrical accommodating cavity, and
And the diameter of accommodating cavity is adjustable, the adjustable range of accommodating cavity diameter is 2cm~10cm.Wherein, its accommodating of phase embedding container
The internal diameter of chamber is 2mm bigger (in this way, the outer diameter of the first epoxy resin protective case 20 is greater than maximum circumcircle than maximum circumscribed circular diameter
Diameter 2mm)；The internal diameter of second phase embedding its accommodating cavity of container then determines that specific standards are as follows according to oil and gas industry standard：
Conglomerate core diameter is not more than 2cm, and the internal diameter of second phase embedding its accommodating cavity of container is determined as 2.54cm；Conglomerate core diameter does not surpass
3.5cm is crossed, the internal diameter of second phase embedding its accommodating cavity of container is determined as 3.8cm；Conglomerate core diameter is no more than 9.5cm, second phase packet
The internal diameter of its accommodating cavity of buried capacitor device is determined as 10cm；Conglomerate core diameter is 10cm, the internal diameter of second phase embedding its accommodating cavity of container
It is determined as 15cm.
In an optional example of the invention, the outer diameter of the first epoxy resin protective case 20 is greater than the straight of maximum circumcircle
Diameter 2mm.
Preferably, flow deflector 40 is in disc-shaped, and the diameter of flow deflector is 20 outer diameter of the first epoxy resin protective case
60%~80%.
In an optional example of the invention, step 2 is specifically included：
Step 21, epoxy resin is melted in 120 DEG C, after epoxy resin is down to 20 DEG C, epoxy resin is injected one
Phase embeds in container；
Step 22, curing agent is added into epoxy resin, and stirs evenly；
Step 23, conglomerate rock core 10 is put into phase embedding container, makes end face (inlet end face and the outlet of conglomerate rock core
End face) it is vertically arranged with the axis of phase embedding container, and guarantee that conglomerate rock core 10 is submerged by epoxy resin completely；
Step 24, epoxy resin cure is completed at normal temperature form the first epoxy resin protective case 20, curing time 48
Hour.
In an optional example of the invention, in step 3, when cutting, uses aviation kerosine as cooling medium；It cuts
After the completion of cutting, baking oven is placed in by the aviation kerosine wiped clean of rock core cut surface, then by the conglomerate rock core 10 after cutting with filter paper
In, the temperature 70 C of baking oven is set, 15 minutes heating times of baking oven, with remove comprehensively its rock core cut surface of conglomerate rock core 10 and
The aviation kerosine that may be disseminated inside conglomerate rock core 10.Its good lubricity is on the one hand considered using aviation kerosine when cutting
Can, on the other hand primarily to preventing clay mineral in conglomerate rock core 10 from water-swellable reaction occurs, lead to conglomerate rock core 10
It destroys.
In step 3, it can use mechanical cutter to cut flat with two end faces of conglomerate rock core 10, it is desirable that conglomerate rock core 10
Both ends must expose the fresh face of 10 its rock core of conglomerate rock core, mechanical cutter and cutting mode are all made of the prior art, herein
Without repeating.
In an optional example of the invention, connect between flow deflector 40 and rock core cut surface by the way that fixed screw 60 is fixed
It connects, to guarantee that flow deflector 40 is fitted closely with rock core cut surface.
Further, in step 4, the outer rim of flow deflector 40 also passes through sealing glue and hermetically connects with rock core cut surface
It connects, reduces closure of the epoxy resin to rock core cut surface (and guide face) during subsequent embedding to the maximum extent.Wherein, close
Sealing water can use the prior art, herein without repeating.
Preferential, sealing glue highest tolerable temperature is not less than 120 DEG C, and the highest proof pressure for sealing glue is not less than
50MPa。
In an optional example of the invention, flow guiding connector 50 and flow deflector 40 can use integral forming technology system
Standby to form, flow guiding connector 50 is arranged at the center (center of circle) of flow deflector 40, meanwhile, flow deflector 40 is coaxially set with conglomerate rock core 10
It sets, relatively percolation path offset error is caused in side when entering rock core cut surface to avoid fluid.
In an optional example of the invention, in step 5, epoxy resin cure forms the second epoxy resin protective case
Operating process is essentially identical with step 2, in Curing Process of Epoxy, fixed screw 60, flow deflector 40 and the first asphalt mixtures modified by epoxy resin
Rouge protective case 20 is totally immersed into epoxy resin, and the flow guiding connector 50 at both ends exposes in epoxy resin without embedding.
The present invention also proposes a kind of conglomerate sample 100 for core analysis, by being used for core analysis as described above
Conglomerate sample preparation methods be prepared, as shown in Figures 2 to 4, which includes by interior
Conglomerate rock core 10, the first epoxy resin protective case 20 and the second epoxy resin protective case 30 being successively arranged outward, specifically, gravel
Rock rock core 10 is in the form of a column, and the both ends of conglomerate rock core 10 are separately installed with guiding device, and guiding device includes flow deflector 40 and water conservancy diversion
Connector 50, flow deflector 40 have along the axis setting perpendicular to conglomerate rock core 10, flow deflector 40 towards the first of conglomerate rock core 10
Surface and backwards to conglomerate rock core second surface, first surface be fitted tightly on the end face of conglomerate rock core 10 and with conglomerate rock core
10 are fixedly connected, and second surface is installed with flow guiding connector 50, and flow guiding connector 50 is in a tubular form and with the axis along flow guiding connector 50
The diversion cavity of perforation, offers the through hole with flow guiding connector corresponding matching on flow deflector 40, through hole be connected to gravel sample and
Diversion cavity；First epoxy resin protective case 20 is set in outside conglomerate rock core 10, the inner wall and gravel of the first epoxy resin protective case 20
The outer wall of rock rock core 10 hermetically connects；Second epoxy resin protective case 30 is set in outside the first epoxy resin protective case 20, the
The inner wall of diepoxy resin protective case 30 is hermetically connect with the outer wall of the first epoxy resin protective case 20, and the second epoxy resin is protected
Sheath 30 closed at both ends simultaneously forms closure part, and closure part is hermetically connect with flow deflector 40, and flow guiding connector 50 runs through closure part.
In an optional example, for the conglomerate sample preparation methods of core analysis, detailed process is as follows：
Firstly, taking out and observing conglomerate rock core 10 (core sample) to be determined, according to core analysis project demand, determine
The both ends of the surface (inlet end face and exit end face) of conglomerate rock core 10；Then, vernier caliper measurement 10 end face of conglomerate rock core is utilized
Rock core size determines the circumscribed circular diameter of maximum of parallel end faces；
Then, according to the determining cylindrical embedding container for epoxy resin embedding of maximum circumscribed circular diameter, (phase is embedded
Container and second phase embedding container) cementing size, the cylindrical embedding container diameter for epoxy resin embedding is adjustable, adjusts
Range is 2cm~10cm, wherein a phase embeds, container diameter circumscribed circular diameter more maximum than conglomerate rock core is 2mm big, and second phase embedding is held
Device diameter then determines that specific standards are as follows according to oil and gas industry standard：Conglomerate core diameter is not more than 2cm, second phase packet
It buries container diameter and is determined as 2.54cm；Conglomerate core diameter is no more than 3.5cm, and second phase embedding container diameter is determined as 3.8cm；Gravel
Rock core diameter is no more than 9.5cm, and second phase embedding container diameter is determined as 10cm；Conglomerate core diameter is 10cm, second phase packet
It buries hydrostatic column diameter and is determined as 15cm；
Later, epoxy resin is melted in 120 DEG C, is injected after being down to 20 DEG C in phase embedding container, curing agent is added,
It stirs evenly, is then put into conglomerate rock core in one phase embedding container perpendicular to the direction of phase embedding container axis along end face,
Guarantee that conglomerate rock core is submerged by epoxy resin completely, solidification is completed under room temperature, forms the first epoxy resin outside conglomerate rock core 10
Protective case 20, general curing time are 48 hours；The purpose of normal temperature cure is utmostly to reduce epoxy resin in embedding process
To the seeping of conglomerate rock core, the fluid in conglomerate rock core is protected no longer to scatter and disappear；Wherein, the asphalt mixtures modified by epoxy resin used in the present invention
Rouge, curing agent and normal temperature cure method are the prior art, herein without repeating；
Later, after epoxy resin is fully cured, the conglomerate rock core 10 embedded by the first epoxy resin protective case 20 is taken out；
Two end faces of the conglomerate rock core 10 embedded by the first epoxy resin protective case 20 are cut flat with using mechanical cutter, it is desirable that two
The fresh face that end face must expose rock core forms rock core cut surface；It uses aviation kerosine as cooling medium when cutting, after cutting flat with, uses
Filter paper then places it in the aviation kerosine wiped clean of sample end face in baking oven, and temperature 70 C is arranged, and heating time 15 divides
Clock removes 10 rock core cut surface of conglomerate rock core and the internal aviation kerosine that may be disseminated comprehensively, is on the one hand examined using aviation kerosine
Its good greasy property is considered, on the other hand primarily to preventing clay mineral generation water-swellable in conglomerate rock core 10 anti-
It answers, conglomerate rock core 10 is caused to destroy；
Later, round stainless steel diversion device, water conservancy diversion dress are installed respectively on two rock core cut surfaces of conglomerate rock core 10
It sets including flow deflector 40 and flow guiding connector 50, is convenient for connecting line.40 diameter of flow deflector by conglomerate rock core 10 the first asphalt mixtures modified by epoxy resin
20 specification of rouge protective case determines, it is desirable that is the 60%~80% of 20 diameter of the first epoxy resin protective case (outer diameter), and flow deflector
40 centers need to be overlapped with rock core cut surface (rock core goes out to show up) center；One surface of flow deflector 40 and the rock core of conglomerate rock core 10 are cut
It is fixed between face using fixed screw 60, guarantees that flow deflector 40 is fitted closely with rock core cut surface, fixed screw 60 is solid
The sealing glue of high temperature resistant and high pressure is smeared at edge, 40 outer rim of flow deflector and rock core cut surface outer edge after fixed, to greatest extent
Reduce closure of the epoxy resin to guide face during subsequent embedding；The external flow guiding connector 50 in another surface of flow deflector 40；It wants
Derivation flow, flow guiding connector and closed glue highest tolerable temperature are not less than 120 DEG C, and highest proof pressure is not less than 50MPa；
Finally, setting second phase embedding container dimensional, repeats the operation of phase embedding, carries out second phase embedding, it is desirable that is fixed
Screw 60, flow deflector 40 and conglomerate rock core 10 are totally immersed into epoxy resin, and the flow guiding connector 50 at both ends is without embedding, room temperature
Lower completion epoxy resin cure forms the second epoxy resin protective case 30, and curing time is not less than 48 hours, thorough to epoxy resin
After the solidification of bottom, experiment terminates, and prepared by the conglomerate sample 100 for core analysis completes.At this point, being used for the conglomerate sample of core analysis
The all epoxy resin of the pressure-bearing surface of product 100, ensure that the Balance of whole system, prevent high-potting process pebblestone
Rock core rupture.
For explaining in detail for the respective embodiments described above, purpose, which is only that, explains the present invention, in order to be able to
More fully understand the present invention, still, these descriptions cannot with any explanation at being limitation of the present invention, in particular,
Each feature described in different embodiments can also mutual any combination, so that other embodiments are formed, in addition to having
Opposite description is specified, these features should be understood to can be applied in any one embodiment, and be not limited merely to
Described embodiment.
Claims (10)
1. a kind of conglomerate sample preparation methods for core analysis, which is characterized in that the preparation method includes：
Step 1, conglomerate rock core to be measured is observed, determines that two end faces of the conglomerate rock core, two end faces are arranged in parallel；
Step 2, make epoxy resin embedding outside the conglomerate rock core and be formed by curing the first epoxy resin protective case；
Step 3, the both ends that the conglomerate rock core is cut along the direction for being parallel to the end face make the both ends point of the conglomerate rock core
Do not expose fresh rock core and forms rock core cut surface；
Step 4, guiding device is installed respectively on two rock core cut surfaces, the guiding device includes flow deflector and lead
Connector is flowed, is fixedly connected with a surface of the flow deflector with the rock core cut surface, another surface of the flow deflector is fixed
There is the flow guiding connector, the through hole being connected to the flow guiding connector is offered on the flow deflector；
Step 5, make epoxy resin embedding outside the first epoxy resin protective case and two flow deflectors outside and solidify shape
At the second epoxy resin protective case, the flow guiding connector runs through the second epoxy resin protective case.
2. being used for the conglomerate sample preparation methods of core analysis as described in claim 1, which is characterized in that in the step 1
Further include measuring the end face, obtains the circumscribed diameter of a circle of maximum of the end face.
3. being used for the conglomerate sample preparation methods of core analysis as claimed in claim 2, which is characterized in that first epoxy
The outer diameter of resin protective case is greater than the circumscribed diameter of a circle 2mm of the maximum.
4. being used for the conglomerate sample preparation methods of core analysis as claimed in claim 3, feature is being, the flow deflector
In disc-shaped, and the diameter of the flow deflector is the 60%~80% of the first epoxy resin protective case outer diameter.
5. being used for the conglomerate sample preparation methods of core analysis as described in claim 1, which is characterized in that step 2 packet
It includes：
Step 21, epoxy resin is melted in 120 DEG C, is injected after being down to 20 DEG C in phase embedding container；
Step 22, curing agent is added into epoxy resin, and stirs evenly；
Step 23, the conglomerate rock core is put into the phase embedding container, makes the end face and described one of the conglomerate rock core
The axis of phase embedding container is vertically arranged, and guarantees that the conglomerate rock core is submerged by epoxy resin completely；
Step 24, the epoxy resin is completed to be formed by curing the first epoxy resin protective case at normal temperature, and curing time is
48 hours.
6. being used for the conglomerate sample preparation methods of core analysis as described in claim 1, which is characterized in that in the step 3
In, when cutting, uses aviation kerosine as cooling medium；After the completion of cutting, with filter paper by the aviation kerosine of the rock core cut surface
Wiped clean, then the conglomerate rock core after cutting is placed in baking oven, the temperature 70 C of the baking oven is set, the baking oven
Heating time 15 minutes.
7. being used for the conglomerate sample preparation methods of core analysis as described in claim 1, which is characterized in that in the step 4
In, the outer rim of the flow deflector is by sealing glue and the rock core cut surface or the first epoxy resin protective case hermetically
Connection.
8. being used for the conglomerate sample preparation methods of core analysis as claimed in claim 7, which is characterized in that the sealing glue
Highest tolerable temperature is not less than 120 DEG C, and the highest proof pressure of the sealing glue is not less than 50MPa.
9. as described in claim 1 be used for core analysis conglomerate sample preparation methods, which is characterized in that the flow deflector with
It is fixedly connected between the rock core cut surface by fixed screw.
10. a kind of conglomerate sample for core analysis, by being used for rock core as in one of claimed in any of claims 1 to 9
The conglomerate sample preparation methods of analysis are prepared, which is characterized in that the conglomerate sample for core analysis includes by interior
It is successively arranged outward：
Conglomerate rock core, is in the form of a column, and the both ends of the conglomerate rock core are separately installed with flow deflector, and the flow deflector is along perpendicular to described
The axis of conglomerate rock core is arranged, and the flow deflector has towards the first surface of the conglomerate rock core and backwards to the conglomerate rock core
Second surface, the first surface is fixedly connected with the end face of the conglomerate rock core, and the second surface is installed with water conservancy diversion and connects
Head, the flow guiding connector in a tubular form and the diversion cavity that there is the axis along the flow guiding connector to penetrate through, open up on the flow deflector
There is the through hole with the flow guiding connector corresponding matching；
First epoxy resin protective case is set in outside the conglomerate rock core, the inner wall of the first epoxy resin protective case and institute
The outer wall for stating conglomerate rock core hermetically connects；
Second epoxy resin protective case is set in outside the first epoxy resin protective case, the second epoxy resin protective case
Inner wall hermetically connect with the outer wall of the first epoxy resin protective case, the both ends of the second epoxy resin protective case are equal
Closure part is closed and is formed, the closure part is hermetically connect with the flow deflector, and the flow guiding connector runs through the closure part.
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| CN108918214B (en) | 2020-12-01 |
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