CN108548702A - Matrix-high infiltration strip rock core prepares green body and rock core preparation method - Google Patents
Matrix-high infiltration strip rock core prepares green body and rock core preparation method Download PDFInfo
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- CN108548702A CN108548702A CN201810197092.5A CN201810197092A CN108548702A CN 108548702 A CN108548702 A CN 108548702A CN 201810197092 A CN201810197092 A CN 201810197092A CN 108548702 A CN108548702 A CN 108548702A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N2001/2893—Preparing calibration standards
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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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Abstract
A kind of matrix high infiltration strip rock core prepares green body and rock core preparation method.Main purpose, which is to provide a kind of base portion, fully to prepare green body and preparation method by the matrix high infiltration strip rock core of saturated oils.This method is characterized mainly in that：When preparing basement rock high infiltration strip rock core, layering and zoning compacting matrix and high infiltration strip part in compacting tool set, matrix and high infiltration strip both ends are suppressed according to ultralow permeability, and when one-dimensional column rock core coring takes into both ends Oil in Super-low Permeability, centre is the long cores of matrix high infiltration strip；Matrix and high infiltration strip part are high pressure saturation region when saturated oils in core holding unit so that simulation oil can smoothly enter into matrix rock core, to realize the purpose of the fully saturated oil of matrix rock core, while judge whether matrix rock core saturated oils is complete using Duplicate Samples.The one-dimensional rock core of matrix high infiltration strip column that fully saturated oil can be prepared using the present invention overcomes the previous problem that saturation is unable to fully because of high infiltration strip presence.
Description
Technical field
The present invention relates to one kind can simulating matrix-high infiltration strip rock core preparation method, belongs to oil-gas field development field.
Background technology
The actual reservoir in China oil field is developed to form the predominant pathways such as macropore and high infiltration strip by long-term injecting, at present
The level of technical monitoring can not be monitored all, also be cannot achieve whole transfer drives and blocked, and no matter lead to high infiltration strip objective reality
On in plane or longitudinal direction, the case where displacement remaining oil, is more universal in the case of matrix-high infiltration strip, can prepare routine at present
The one-dimensional column rock core of column, centre lay high infiltration strip, but indoors test saturated oils when there is saturated oils problem because intermediate
Partial permeability is big, and fat oil is flowed out from middle section when saturated oils, is caused both sides base portion to be unable to fully be saturated, is made
Obtaining subsequent experimental can not carry out, and lead to not carry out matrix-high infiltration strip evaluation study.
Invention content
The technical issues of in order to solve to be previously mentioned in background technology, the present invention provide a kind of new solution.In the solution
The matrix certainly prepared under scheme-high infiltration strip rock core, may be implemented fully saturated oil, and specific solution is by making
When standby basement rock high infiltration strip rock core, layering and zoning compacting matrix and high infiltration strip part, matrix and hypertonic item in compacting tool set
Band both ends are suppressed according to ultralow permeability, and when one-dimensional column rock core coring takes into both ends Oil in Super-low Permeability, centre is matrix-high infiltration strip
Long cores, because of both ends Oil in Super-low Permeability when saturated oils in core holding unit, the pressure that saturated oils needs is significantly increased, matrix with
High infiltration strip part is high pressure saturation region so that simulation oil can smoothly enter into matrix rock core, to realize that matrix rock core is complete
The purpose of full saturated oils, while needing to judge whether matrix rock core saturated oils complete using Duplicate Samples.
The technical scheme is that：This kind of matrix-high infiltration strip rock core prepares green body, including upper hypothallus and lower base
Matter layer, high infiltration strip layer is between upper hypothallus and lower hypothallus, upper hypothallus, high infiltration strip layer and lower hypothallus three
Between by suppress it is cementing connect and compose matrix, be unique in that：It is ultralow that it is equipped with left end respectively at the both ends of described matrix
Permeate section and right end ultra-low penetration section；By suppressing glue between described matrix and left end ultra-low penetration section and right end ultra-low penetration section
Knot is connected as one.
The aforementioned method for preparing green body and matrix-high infiltration strip rock core is prepared, is included the following steps：
Step 1：According to practical reservoir mesostroma permeability to be simulated and high infiltration strip permeability and depth information, respectively
Compacting cementitious matrix rock core A plates, the rock core B plates of homogeneous high infiltration strip permeability and Oil in Super-low Permeability rock core C plates simultaneously drill through core sample；
The Oil in Super-low Permeability core permeability used in this step is 0.1 × 10-3μm2；
Step 2：Rock core gradation pressing structure figure is built, is determined according to the rock core gradation pressing structure figure and suppresses heterogeneous base
Then matrix material is divided into 2 parts by the material of matter-high infiltration strip rock core D plates, Oil in Super-low Permeability rock core material correspondence is divided into 3 parts；
Step 3 installs bottom plate, mold, respectively in heterogeneous matrix-high infiltration strip rock core D plates described in pressing step two
Three layers of rock core, are as follows：
1. suppressing first layer：The use of length is 200mm, thickness is that unitary mould is divided into 3 parts, both sides width by the plank of 1mm
50mm, intermediate width 100mm, among the uniform loading mold of the 1st part of the uniformly mixed matrix material divided in step 2
Part, Oil in Super-low Permeability rock core material are put into two side portions, after pumping veneer matter baffle, put pressing plate above whole material, use pressure
Force tester stops pressurization after being slowly forced into pressure P；
2. suppressing the second layer：2 thin barrier partitions are reused into 3 parts, both sides width 50mm, intermediate width 100mm, thin plate
Centre is packed into the material of high infiltration strip, and both sides are uniformly filled according to the quality of material of high infiltration strip THICKNESS CALCULATION excess of export low permeability cores
Excess of imports low permeability cores material removes 2 veneer baffles, and pressing plate is put in the whole top of second layer material, uses pressure testing
Machine stops pressurization after being slowly forced into pressure P；
3. suppressing third layer：2 veneers are put among rock core mold again to separate, position is constant, successively in middle section
Be added the 2nd part of matrix material, by remaining Oil in Super-low Permeability surplus material it is average be even added to veneer both sides, extract out again thin
Plank adds pressing plate above overall third part material, when being slowly forced into persistent pressure T after pressure P using pressure testing machine
Between section.After, top board is taken out in pressure release, and the rock core pressed, which is put into 90 degrees Celsius of constant temperature in insulating box, to be cured 24 hours；
Step 4, the core bit for being 210mm with a diameter of 25mm length are hypertonic to the heterogeneous matrix-being cured in step 3
Band rock core D plates carry out rock core coring, form the system of column matrix-high infiltration strip rock core of the both sides with Oil in Super-low Permeability rock core part
Standby green body；Choose spare, the base for preparing 4 pieces of green body of high infiltration strip position matrix-high infiltration strip rock core placed in the middle after coring
Matter-high infiltration strip rock core to prepare that green body numbers respectively be D1, D2, D3 and D4；
Step 5 carries out the calibration of matrix, high infiltration strip and Oil in Super-low Permeability rock core initial oil saturation, this step is according to as follows
It realizes in path：
By the cylindrical sample of the matrix rock core obtained in step 1, the rock core of homogeneous high infiltration strip permeability and Oil in Super-low Permeability rock core point
It is not placed on evacuation, saturated water, saturated oils in core holding unit, calculates the porosity of 3 kinds of rock coresMatrix,ØBand,ØIt is ultralowAnd original contain
Oily saturation degree SOi matrix,SOi bands,SOi is ultralow；Matrix-the height obtained in step 4 is calculated according to the initial oil saturation of 3 kinds of rock cores
The rock core theory porosity for preparing green body D1 to D4 of infiltration strip rock coreIt is theoreticalWith initial oil saturation SOi is theoretical；
Step 6, the matrix-high infiltration strip rock core obtained in selecting step four prepare green body, and it is 200mm to be sequentially placed into length
Core holding unit, evacuate, calculate actual measurement porosity, choose in wherein actual measurement porosity value and step 5It is theoreticalIt is closest
Rock core prepare in step 7；
Step 7, by the rock core for preparing green body and being put into corresponding length of matrix-high infiltration strip rock core in step 6 preferably out
In clamper, 10MPa ring pressures are set, back pressure 6MPa is arranged in clamper outlet end, and inlet pressure is since 7MPa, using constant pressure pump
After the saturated oils process of oily expelling water is carried out until exit velocity stablizes, injection end pressure is gradually increased successively to 8MPa, 9MPa,
Go out water inventory according to clamper outlet end and calculates rock core actual measurement oil saturation SOi is surveyed,If SOi is surveyedWith in inventive step five
SOi is theoreticalError is within ± 1%, it is believed that saturated oils saturation is complete, and the matrix-high infiltration strip rock core prepares green body qualification, otherwise
Step 4 is repeated to step 7, until meeting error requirements；Select the hypertonic item of matrix-for meeting fully saturated requirement
Green body Dm is prepared with rock core；
The green body for preparing of matrix-high infiltration strip rock core of abundant saturated oils in step 7 preferably out is carried out nothing by step 8
Both ends are cut under water condition, and ultra-low penetration section is cut off, and carry out section grinding later, and end face cleaning treatment is fully saturated
Matrix-high infiltration strip rock core of oil.
The present invention has the advantages that：By when preparing basement rock high infiltration strip rock core, being layered in compacting tool set
Subregion suppresses matrix and high infiltration strip part, and matrix and high infiltration strip both ends are suppressed according to ultralow permeability, one-dimensional column rock core
Both ends Oil in Super-low Permeability is taken into when coring, centre be matrix-high infiltration strip long cores, because two when saturated oils in core holding unit
Oil in Super-low Permeability, the pressure that saturated oils needs is held to be significantly increased, matrix and high infiltration strip part are high pressure saturation region so that simulation oil
Matrix rock core can be can smoothly enter into, to realize the purpose of the fully saturated oil of matrix rock core.The present invention is by preparing in rock core
Design in the process prepares the matrix-one-dimensional rock core of high infiltration strip column for the fully saturated oil that can be verified, for the field
Obstacle has been cleared away in technology development, overcomes the previous problem that saturated oils is unable to fully because of high infiltration strip presence, significant.
Description of the drawings：
Fig. 1 is the structural schematic diagram for preparing green body of matrix of the present invention-high infiltration strip rock core.
Fig. 2 is rock core gradation pressing structure figure of the present invention.
Fig. 3 is the schematic diagram that veneer separates dress material.
Fig. 4 is to utilize matrix-high infiltration strip rock core after the finally obtained abundant saturated oils of the method for the invention.
1- bottom plates 2- ironys surrounding baffle 3- separation veneers in figure, the upper hypothallus of 4-, 5- high infiltration strip layers, under 6-
Hypothallus, 7- right end ultra-low penetration sections, 8- left end ultra-low penetration sections, 9- are saturated the upper hypothallus finished, and 10- is saturated the height finished
Infiltration strip layer, 11- are saturated the lower hypothallus finished.
Specific implementation mode：
The invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, this kind of matrix-high infiltration strip rock core prepares green body, including upper hypothallus 4 and lower hypothallus 6, hypertonic item
Belt 5 leads between upper hypothallus 4 and lower hypothallus 6 between upper hypothallus 4, high infiltration strip layer 5 and lower 6 three of hypothallus
Over-pressed glue knot connects and composes matrix.It is unique in that：It is equipped with left end ultra-low penetration section 8 respectively at the both ends of described matrix
With right end ultra-low penetration section 7；It is cementing by suppressing between described matrix and left end ultra-low penetration section 8 and right end ultra-low penetration section 7
It is connected as one.
The preparation method of this kind of matrix-high infiltration strip rock core, this method comprises the following steps：
Step 1：According to practical reservoir mesostroma permeability to be simulated and high infiltration strip permeability and depth information, respectively
Compacting cementitious matrix rock core A plates, the rock core B plates of homogeneous high infiltration strip permeability and Oil in Super-low Permeability rock core C plates simultaneously drill through core sample；
The Oil in Super-low Permeability core permeability used in this step is 0.1 × 10-3μm2。
In this step, according to practical reservoir mesostroma permeability to be simulated and high infiltration strip permeability and thickness feelings
Condition suppresses gluing method using rock core compacting tool set and pressure testing machine using quartz sand resin, when preparation fixation pressure P with
Pressure time T is held, long 200mm is chosen, the die assembly of wide 200mm determines that Oil in Super-low Permeability core permeability is 0.1 × 10-3μm2,Rock
Heart overall thickness 35mm.It is determined here that being 0.1 × 10-3μm the reason of be 0.1 × 10-3μm2It is to do artificial core at present to accomplish
Minimum permeability limits.By adjusting quartz sand size distribution, epoxy resin adhesive content obtains preparation matrix and oozes respectively
Quartz sand size distribution proportion, the adhesive content parameter of saturating rate rock core, high infiltration strip rock core and Oil in Super-low Permeability rock core.Divide later
The whole rock cores of tri- blocks of cementing A, B, C are not suppressed.Matrix rock core A plates drill through core sample, diameter 25mm long after suppressing cementation solidifying
100mm；The rock core B plates of homogeneous high infiltration strip permeability drill through core sample, diameter 25mm long 100mm after suppressing cementation solidifying；
Oil in Super-low Permeability rock core C plates drill through core sample, diameter 25mm long 100mm after suppressing cementation solidifying.
Step 2：Rock core gradation pressing structure figure is built, determines that compacting is non-according to the rock core gradation pressing structure figure
Then matrix material is divided into 2 parts by the material of matter matrix-high infiltration strip rock core D plates, Oil in Super-low Permeability rock core material correspondence is divided into
3 parts.
In this step, because the experimental data obtained in above-mentioned steps one has each material gross mass and suppresses rock core
Thickness data can be counted according to the experimental data obtained in the design thickness combination step 1 of structure rock core gradation pressing structure figure
The material total volume needed for matrix rock core, high infiltration strip rock core and Oil in Super-low Permeability rock core is calculated, using the computational methods of volume ratio
It calculates according to the quartz sand size distribution proportion and total sand amount, gluing needed for parameter listed by structure rock core gradation pressing structure figure
Agent total amount, curing agent content.After being mixed with adhesive to 3 parts of rock core materials, stranding sand is carried out respectively, sieving prepares.
Step 3 installs bottom plate, mold, respectively heterogeneous matrix-high infiltration strip rock core D plates described in pressing step two
In three layers of rock core, be as follows：
1. suppressing first layer：The use of length is 200mm, thickness is that unitary mould is divided into 3 parts, both sides width by the plank of 1mm
50mm, intermediate width 100mm, among the uniform loading mold of the 1st part of the uniformly mixed matrix material divided in step 2
Part, Oil in Super-low Permeability rock core material are put into two side portions, after pumping veneer matter baffle, put pressing plate above whole material, use pressure
Force tester stops pressurization after being slowly forced into pressure P；
2. suppressing the second layer：2 thin barrier partitions are reused into 3 parts, both sides width 50mm, intermediate width 100mm, thin plate
Centre is packed into the material of high infiltration strip, and both sides are uniformly filled according to the quality of material of high infiltration strip THICKNESS CALCULATION excess of export low permeability cores
Excess of imports low permeability cores material removes 2 veneer baffles, and pressing plate is put in the whole top of second layer material, uses pressure testing
Machine stops pressurization after being slowly forced into pressure P；
3. suppressing third layer：2 veneers are put among rock core mold again to separate, position is constant, successively in middle section
Be added the 2nd part of matrix material, by remaining Oil in Super-low Permeability surplus material it is average be even added to veneer both sides, extract out again thin
Plank adds pressing plate above overall third part material, when being slowly forced into persistent pressure T after pressure P using pressure testing machine
Between section.After, top board is taken out in pressure release, and the rock core pressed, which is put into 90 degrees Celsius of constant temperature in insulating box, to be cured 24 hours；
Step 4, the core bit for being 210mm with a diameter of 25mm length are hypertonic to the heterogeneous matrix-being cured in step 3
Band rock core D plates carry out rock core coring, form the system of column matrix-high infiltration strip rock core of the both sides with Oil in Super-low Permeability rock core part
Standby green body；Choose spare, the base for preparing 4 pieces of green body of high infiltration strip position matrix-high infiltration strip rock core placed in the middle after coring
Matter-high infiltration strip rock core to prepare that green body numbers respectively be D1, D2, D3 and D4；
Step 5 carries out the calibration of matrix, high infiltration strip and Oil in Super-low Permeability rock core initial oil saturation, this step is according to as follows
It realizes in path：
By the cylindrical sample of the matrix rock core obtained in step 1, the rock core of homogeneous high infiltration strip permeability and Oil in Super-low Permeability rock core point
It is not placed on evacuation, saturated water, saturated oils in core holding unit, calculates the porosity of 3 kinds of rock coresMatrix,ØBand,ØIt is ultralowAnd original contain
Oily saturation degree SOi matrix,SOi bands,SOi is ultralow；Matrix-the height obtained in step 4 is calculated according to the initial oil saturation of 3 kinds of rock cores
The rock core theory porosity for preparing green body D1 to D4 of infiltration strip rock coreIt is theoreticalWith initial oil saturation SOi is theoretical；
Step 6, the matrix-high infiltration strip rock core obtained in selecting step four prepare green body, and it is 200mm to be sequentially placed into length
Core holding unit, evacuate, calculate actual measurement porosity, choose in wherein actual measurement porosity value and step 5It is theoreticalIt is closest
Rock core prepare in step 7；
Step 7, by the rock core for preparing green body and being put into corresponding length of matrix-high infiltration strip rock core in step 6 preferably out
In clamper, 10MPa ring pressures are set, back pressure 6MPa is arranged in clamper outlet end, and inlet pressure is since 7MPa, using constant pressure pump
After the saturated oils process of oily expelling water is carried out until exit velocity stablizes, injection end pressure is gradually increased successively to 8MPa, 9MPa,
Go out water inventory according to clamper outlet end and calculates rock core actual measurement oil saturation SOi is surveyed,If SOi is surveyedWith in inventive step five
SOi is theoreticalError is within ± 1%, it is believed that saturated oils saturation is complete, and the matrix-high infiltration strip rock core prepares green body qualification, otherwise
Step 4 is repeated to step 7, until meeting error requirements；Select the hypertonic item of matrix-for meeting fully saturated requirement
Green body Dm is prepared with rock core；
The green body for preparing of matrix-high infiltration strip rock core of abundant saturated oils in step 7 preferably out is carried out nothing by step 8
Both ends are cut under water condition, and ultra-low penetration section is cut off, and carry out section grinding, end face cleaning treatment later, as shown in figure 4, obtaining
To matrix-high infiltration strip rock core of abundant saturated oils.
A specific embodiment is given below：
According to the actual block condition of Daqing oil field, matrix permeability to be simulated is 500 × 10-3μm2, high infiltration strip permeability
2200×10-3μm2, the high infiltration strip thickness in the one-dimensional cylinder rock core being calculated according to similarity criterion is 3mm, uses rock
Heart compacting tool set and pressure testing machine prepare rock core using quartz sand resin compacting gluing method.
（1）Fixation pressure 10MPa and pressure time 5min is held when preparation, chooses long 200mm, the die assembly of wide 200mm, really
It is 0.1 × 10 to determine Oil in Super-low Permeability core permeability-3μm2, rock core overall thickness 35mm.By adjusting quartz sand size distribution, asphalt mixtures modified by epoxy resin
Fat gluing agent content, respectively acquisition prepare the quartzy sand grains of matrix permeability rock core, high infiltration strip rock core and Oil in Super-low Permeability rock core
It is as shown in table 1 to spend distribution proportion, the material proportion table of adhesive content parameter：.
1 each rock core of table prepares required material proportion table
| Coarse sand mesh number（40-70）Quality（Gram） | Fine sand mesh number（300）Quality（Gram） | Resin quality（Gram） | Curing agent quality（Gram） | Corresponding permeability（×10-3μm2） | Remarks |
| 1358 | 2142 | 412 | 26 | 500 | Matrix |
| 2397 | 1103 | 527 | 33 | 2200 | High infiltration strip |
| 72 | 3428 | 737 | 47 | 0.1 | Oil in Super-low Permeability |
（2）Matrix rock core A plates are prepared according to table 1, core sample, diameter 25mm long 100mm are drilled through after suppressing cementation solidifying；
（3）The rock core B plates of homogeneous high infiltration strip permeability are prepared according to table 1, and core sample, diameter are drilled through after suppressing cementation solidifying
25mm long 100mm；
（4）Oil in Super-low Permeability rock core C plates are prepared according to table 1, core sample, diameter 25mm long 100mm are drilled through after suppressing cementation solidifying；
（5）Heterogeneous matrix-high infiltration strip rock core D plates are prepared, preparation process is as follows：
1）The quartz sand needed for matrix rock core, high infiltration strip rock core and Oil in Super-low Permeability rock core is calculated according to the data obtained in table 1
Size distribution ratio and total sand amount, adhesive total amount, curing agent content.Such as the following table 2 and table 3：
2 heterogeneous core material proportion table of table
| Coarse sand mesh number（40-70）Quality（Gram） | Fine sand mesh number（300）Quality（Gram） | Resin quality（Gram） | Curing agent quality（Gram） | Corresponding permeability（×10-3μm2） | Remarks | Material gross mass（Gram） |
| 815 | 1285 | 247 | 16 | 500 | Matrix | 2363 |
| 113 | 52 | 25 | 2 | 2200 | High infiltration strip | 192 |
| 46 | 2203 | 474 | 30 | 0.1 | Oil in Super-low Permeability | 2753 |
3 heterogeneous core each section material allocation table of table
| The number of plies | Material gross mass（Gram） | It suppresses for the first time（Gram） | Second of compacting（Gram） | Third time is suppressed（Gram） |
| Base portion | 2363 | 1181.5 | 0 | 1181.5 |
| High infiltration strip | 192 | 0 | 192 | 0 |
| Oil in Super-low Permeability | 2753 | 1308（It is equally divided into both sides） | 138 | 1308（It is equally divided into both sides） |
2）Bottom plate, mold are installed, three layers of rock core is suppressed respectively, is as follows：
1. suppressing first layer：The use of length is 2 thin thin planks of 200mm（Thick 1mm）Unitary mould is divided into 3 parts, two
Side width 50mm, intermediate width 100mm, as shown in Fig. 2, point the 1st part 1181.5 grams of good uniformly mixed matrix material is uniformly
Loading mold middle section, Oil in Super-low Permeability rock core material is put into two side portions, whole after pumping veneer matter baffle per 654 grams of part
Pressing plate is put above body material, stops pressurization after pressure 10MPa is slowly forced into using pressure testing machine；
2. suppressing the second layer：Reuse 2 thin baffles（Thick 1mm）It is separated into 3 parts, both sides width 50mm, intermediate width
100mm, thin plate centre are packed into 192 grams of the material of high infiltration strip, and both sides are according to high infiltration strip THICKNESS CALCULATION excess of export low permeability cores
Each 69 grams of quality of material, careful uniform loading Oil in Super-low Permeability rock core material, removes 2 veneer baffles, and second layer material is whole
Pressing plate is put above body, stops pressurization after pressure 10MPa is slowly forced into using pressure testing machine；
3. suppressing third layer：2 veneers are put among rock core mold again（Thick 1mm）Separate, position is constant, successively in
Between the 2nd part 1181.5 grams of matrix material is partly added, remaining Oil in Super-low Permeability surplus material is respectively added to veneer both sides 654
Gram, it extracts 2 veneers out again, pressing plate will be added above overall third part material, pressure is slowly forced into using pressure testing machine
Persistent pressure 5min after power 10MPa.After, pressure release takes out top board, the rock core pressed is prepared green body and is put into insulating box
90 degrees Celsius of constant temperature cures 24 hours.
3）The rock core being cured is prepared green body coring by the core bit for being 210mm with a diameter of 25mm length, and selection takes
High infiltration strip position rock core placed in the middle prepares that 4 pieces of green body is spare after the heart, and it is that 25mm length is that the rock core of taking-up, which prepares blank diameter,
200mm, number D1, D2, D3, D4, for use.
（6）Carry out the calibration of matrix, high infiltration strip and Oil in Super-low Permeability rock core initial oil saturation
By step（2）、（3）、（4）The cylindrical sample of middle acquirement is individually placed to evacuation, saturated water, saturated oils in core holding unit,
Calculate the porosity of 3 kinds of rock coresMatrix,ØBand,ØIt is ultralowAnd initial oil saturation SOi matrix,SOi bands,SOi is ultralow.According to 3 kinds of rock cores
Initial oil saturation calculates the theoretical porosity of D1-D4 rock cores in inventive step oneIt is theoreticalWith initial oil saturation SOi is theoretical.Table
4 be test and result of calculation table.
Table 4 is tested and result of calculation table
| Classification | Matrix | High infiltration strip | Oil in Super-low Permeability rock core | Rock core of the both ends with Oil in Super-low Permeability（It is theoretical） |
| Porosity | ØMatrix=25.1% | ØBand=32.2% | ØIt is ultralow=10.4% | ØIt is theoretical=17.8% |
| Initial oil saturation | SOi matrix=72.3% | SOi bands=75.4% | SOi is ultralow=60.5% | SOi is theoretical=68.9% |
（7）D1-D4 rock cores are prepared into green body, are sequentially placed into the core holding unit that length is 200mm, evacuates, calculate actual measurement hole
Degree, table 5 are test and result of calculation table, choose itself and step（6）InIt is theoreticalIt is real that immediate rock core carries out follow-up saturated oils
It tests.According to correction data, preferably D2 blocks rock core carries out subsequent experimental.
5 each rock core of table surveys porosity
| Classification | Rock core of the both ends with Oil in Super-low Permeability（It is theoretical） | D1 is surveyed | D2 is surveyed | D3 is surveyed | D4 is surveyed |
| Porosity | ØIt is theoretical=17.8% | 17.1% | 17.7% | 16.8% | 17.0% |
（8）D2 rock cores are prepared green body to be placed in core holding unit, 10MPa ring pressures are set, back pressure is arranged in clamper outlet end
6MPa, inlet pressure is since 7MPa, using the saturated oils process of the oily expelling water of constant pressure pump progress after exit velocity is stablized, according to
The secondary injection end pressure that gradually increases goes out water inventory according to clamper outlet end and calculates rock core actual measurement oil-containing saturation to 8MPa, 9MPa
Spend SOi is surveyed,As shown in table 6.
6 rock core of table surveys oil saturation
| Classification | Rock core of the both ends with Oil in Super-low Permeability（It is theoretical） | D2 is surveyed | Remarks |
| Initial oil saturation | SOi is theoretical=68.9% | 68.2% | Meet requirement of experiment |
（9）D2 rock cores are prepared into green body and carry out both ends cutting under anhydrous condition, section grinding, end face cleaning treatment obtains diameter
For the matrix-high infiltration strip rock core for the abundant saturated oils that 25mm length is 100mm.
It can be seen that the present invention by design during prepared by rock core, prepares, can verify is completely full
With matrix-one-dimensional rock core of high infiltration strip column of oil.
Claims (2)
1. a kind of matrix-high infiltration strip rock core prepares green body, including upper hypothallus (4) and lower hypothallus (6), high infiltration strip layer
(5) between upper hypothallus (4) and lower hypothallus (6), upper hypothallus (4), high infiltration strip layer (5) and lower hypothallus (6) three
Between person matrix is connected and composed by the way that compacting is cementing, it is characterised in that：It is equipped with left end Oil in Super-low Permeability respectively at the both ends of described matrix
Saturating section（8）With right end ultra-low penetration section（7）；Described matrix and left end ultra-low penetration section（8）With right end ultra-low penetration section（7）Between
By suppressing cementing be connected as one.
2. a kind of preparation method of matrix-high infiltration strip rock core, this method comprises the following steps：
Step 1：According to practical reservoir mesostroma permeability to be simulated and high infiltration strip permeability and depth information, respectively
Compacting cementitious matrix rock core A plates, the rock core B plates of homogeneous high infiltration strip permeability and Oil in Super-low Permeability rock core C plates simultaneously drill through core sample；
The Oil in Super-low Permeability core permeability used in this step is 0.1 × 10-3μm2；
Step 2：Rock core gradation pressing structure figure is built, is determined according to the rock core gradation pressing structure figure and suppresses heterogeneous base
Then matrix material is divided into 2 parts by the material of matter-high infiltration strip rock core D plates, Oil in Super-low Permeability rock core material correspondence is divided into 3 parts；
Step 3 installs bottom plate, mold, respectively in heterogeneous matrix-high infiltration strip rock core D plates described in pressing step two
Three layers of rock core, are as follows：
1. suppressing first layer：Unitary mould is divided into 3 parts using two pieces of veneers, it is uniformly mixed by what is divided in step 2
The 1st part of matrix material is uniform to be packed into mold middle section, and Oil in Super-low Permeability rock core material is put into two side portions, pumps veneer matter baffle
Afterwards, pressing plate is put above whole material, stops pressurization after pressure P is slowly forced into using pressure testing machine；
2. suppressing the second layer：It reuses 2 pieces of veneers and is separated into 3 parts, be packed into the material of high infiltration strip among veneer, two
Side is uniformly packed into Oil in Super-low Permeability rock core material, removes 2 thin according to the quality of material of high infiltration strip THICKNESS CALCULATION excess of export low permeability cores
The whole top of second layer material is put pressing plate, stops pressurization after pressure P is slowly forced into using pressure testing machine by plank；
3. suppressing third layer：2 veneers are put among rock core mold again to separate, position is constant, successively in middle section
Be added the 2nd part of matrix material, by remaining Oil in Super-low Permeability surplus material it is average be even added to veneer both sides, extract out again thin
Plank adds pressing plate above overall third part material, when being slowly forced into persistent pressure T after pressure P using pressure testing machine
Between section；After, top board is taken out in pressure release, and the rock core pressed, which is put into 90 degrees Celsius of constant temperature in insulating box, to be cured 24 hours；
Step 4, the core bit for being 210mm with a diameter of 25mm length are hypertonic to the heterogeneous matrix-being cured in step 3
Band rock core D plates carry out rock core coring, form the system of column matrix-high infiltration strip rock core of the both sides with Oil in Super-low Permeability rock core part
Standby green body；Choose spare, the base for preparing 4 pieces of green body of high infiltration strip position matrix-high infiltration strip rock core placed in the middle after coring
Matter-high infiltration strip rock core to prepare that green body numbers respectively be D1, D2, D3 and D4；
Step 5 carries out the calibration of matrix, high infiltration strip and Oil in Super-low Permeability rock core initial oil saturation, this step is according to as follows
It realizes in path：
By the cylindrical sample of the matrix rock core obtained in step 1, the rock core of homogeneous high infiltration strip permeability and Oil in Super-low Permeability rock core point
It is not placed on evacuation, saturated water, saturated oils in core holding unit, calculates the porosity of 3 kinds of rock coresMatrix,ØBand,ØIt is ultralowAnd original contain
Oily saturation degree SOi matrix,SOi bands,SOi is ultralow；Matrix-the height obtained in step 4 is calculated according to the initial oil saturation of 3 kinds of rock cores
The rock core theory porosity for preparing green body D1 to D4 of infiltration strip rock coreIt is theoreticalWith initial oil saturation SOi is theoretical；
Step 6, the matrix-high infiltration strip rock core obtained in selecting step four prepare green body, and it is 200mm to be sequentially placed into length
Core holding unit, evacuate, calculate actual measurement porosity, choose in wherein actual measurement porosity value and step 5It is theoreticalIt is closest
Rock core prepare in step 7；
Step 7, by the rock core for preparing green body and being put into corresponding length of matrix-high infiltration strip rock core in step 6 preferably out
In clamper, 10MPa ring pressures are set, back pressure 6MPa is arranged in clamper outlet end, and inlet pressure is since 7MPa, using constant pressure pump
After the saturated oils process of oily expelling water is carried out until exit velocity stablizes, injection end pressure is gradually increased successively to 8MPa, 9MPa,
Go out water inventory according to clamper outlet end and calculates rock core actual measurement oil saturation SOi is surveyed,If SOi is surveyedWith in inventive step five
SOi is theoreticalError is within ± 1%, it is believed that saturated oils saturation is complete, and the matrix-high infiltration strip rock core prepares green body qualification, otherwise
Step 4 is repeated to step 7, until meeting error requirements；Select the hypertonic item of matrix-for meeting fully saturated requirement
Green body Dm is prepared with rock core；
The green body for preparing of matrix-high infiltration strip rock core of abundant saturated oils in step 7 preferably out is carried out nothing by step 8
Both ends are cut under water condition, and ultra-low penetration section is cut off, and carry out section grinding later, and end face cleaning treatment is fully saturated
Matrix-high infiltration strip rock core of oil.
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