CN109443886B - Method for manufacturing simulated rock core with fixed pore throat and particle surface property - Google Patents
Method for manufacturing simulated rock core with fixed pore throat and particle surface property Download PDFInfo
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- CN109443886B CN109443886B CN201910034384.1A CN201910034384A CN109443886B CN 109443886 B CN109443886 B CN 109443886B CN 201910034384 A CN201910034384 A CN 201910034384A CN 109443886 B CN109443886 B CN 109443886B
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Abstract
The invention relates to a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties. The invention relates to a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties, which comprises the step of filling a high-temperature-resistant high-strength toughened glass ball material into a mold and compacting the material. The pore throat is changed by adjusting the radius of the glass ball, the clay solution prepared in advance is displaced for the glass simulated rock core, different properties of the particle surface are realized, and further, the influence rule of the rock particle surface properties on the displacement effect when different fluids displace rocks can be explored. The whole simulated rock core is simple in manufacturing method and economical and easily available in raw materials, and the problems that a natural rock core is difficult to obtain, the surface property of particles of a common artificial rock core is uncertain, and a single influence factor cannot be explored are solved.
Description
Technical Field
The invention relates to a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties, and belongs to the technical field of preparation of simulated rock cores.
Background
In a series of stratum processing processes such as exploration, development, reservoir transformation and the like in the petroleum industry, the response rule of rocks under different action conditions is of great importance, when rock property testing is carried out in a laboratory, the natural rock core is difficult to obtain and expensive, and obvious difference is shown in the natural rock core due to different drilling rock core positions, and the research on the rock response rule in the laboratory is limited by the influence of the factors.
For the research on the displacement effect of the surface properties of rock particles, a few natural rock cores are adopted, quartz sand or river sand is mainly used as a framework material, and epoxy resin or composite phosphate and the like are used as cementing agents to prepare artificial rock cores. For the experiment for exploring the influence of the surface properties of rock particles on the displacement effect, no matter natural rock cores or common artificial rock cores can not control a single variable, the influence of different fluids on the rock cannot be necessarily explored, and the dynamic response of rock physical properties to fluids in the rock cannot be described.
Therefore, it is necessary to design a method for manufacturing a simulated core to manufacture a simulated core required by a laboratory experiment for researching the rule of influence of the surface properties of rock particles on the displacement effect when different fluids displace the rock.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties.
The technical scheme of the invention is as follows:
a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties comprises the following steps:
(1) selecting glass balls with the radius of 0.5mm-1.5mm for later use;
(2) putting the glass balls into a mould and compacting to obtain a glass ball simulation core;
(3) uniformly stirring and mixing montmorillonite, kaolin and chlorite to form a mixture A, wherein the mass ratio of the montmorillonite to the kaolin to the chlorite is (0.1-1) to (0.1-2) to (0.1-3);
(4) adding water into the mixture A, and stirring to prepare a clay solution B, wherein the content of solute in the clay solution B is 3% -20%;
(5) putting the glass ball simulated core prepared in the step (2) into a core holder, and performing displacement adhesion by using a clay solution B;
(6) and after the displacement adhesion is finished, taking out the glass ball simulated core from the core holder, and carrying out heating treatment to finally obtain a simulated core finished product.
Preferably, in the step (1), the glass balls made of toughened glass are selected, and the compressive strength is 6 MPa.
Preferably, in step (1), the glass spheres selected have a maximum withstand temperature of 180 ℃.
Preferably, in the step (2), the mold is a cylinder, is made of toughened glass, and has a height of 65mm, an inner diameter of 25mm, an outer diameter of 28mm, and a compressive strength of 6 MPa.
Preferably, in the step (2), a four-column hydraulic press is adopted for compaction, the range of pressurization is 0-30MPa, the pressure of compaction is 1-3MPa, and the duration of pressurization is 1-10 min.
Preferably, in the step (3), the particle mesh number of the montmorillonite is 500-1200 meshes, the particle mesh number of the kaolin is 500-1200 meshes, and the particle mesh number of the chlorite is 500-1200 meshes.
Preferably, in the step (3), the montmorillonite, the kaolin and the chlorite are stirred and mixed for at least 3 min.
Preferably, in step (4), the water used is deionized water.
Preferably, in the step (5), the core holder can provide confining pressure and displacement action, and the confining pressure is 0.2-0.5MPa and the displacement pressure is 0.1-0.3 MPa.
Preferably, in step (5), the time for displacement attachment is 5-20 min.
Preferably, in the step (6), a dryer is adopted for heating, and the heating temperature range is 0-500 ℃.
Preferably, in step (6), the heating is carried out in a stepwise manner, first at 80 ℃ for 1h and then at 120 ℃ for 2 h.
The invention has the beneficial effects that:
the method for manufacturing the simulated rock core with the fixed pore throat and the fixed particle surface property realizes the purpose of filling a high-temperature-resistant high-strength toughened glass ball material into a mold and compacting the material. The pore throat is changed by adjusting the radius of the glass ball, the clay solution prepared in advance is displaced for the glass simulated rock core, different properties of the particle surface are realized, and further, the influence rule of the rock particle surface properties on the displacement effect when different fluids displace rocks can be explored. The whole simulated rock core is simple in manufacturing method and economical and easily available in raw materials, and the problems that a natural rock core is difficult to obtain, the surface property of particles of a common artificial rock core is uncertain, and a single influence factor cannot be explored are solved.
Drawings
FIG. 1 is a flow chart of a method of making a simulated core according to the present invention;
FIG. 2 is a schematic diagram of the structure of a prepared simulated core;
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, this embodiment provides a method for making a pseudo core with a fixed pore throat and particle surface properties, which includes the following specific operation processes:
(1) selecting glass balls with the radius of 0.5mm and made of toughened glass, wherein the compressive strength is 6MPa, and the maximum bearing temperature is 180 ℃ for later use;
(2) putting the glass spheres into a cylindrical mold, and compacting by adopting a four-column hydraulic press to obtain a glass sphere simulation core;
(3) uniformly stirring and mixing montmorillonite, kaolin and chlorite in a container to form a mixture A, wherein the mass ratio of the montmorillonite to the kaolin to the chlorite is 1:1:1, and the stirring and mixing time is 3 min;
(4) adding deionized water into the mixture A, and stirring to prepare a clay solution B, wherein the content of solute in the clay solution B is 10%;
(5) and (3) putting the glass ball simulated rock core prepared in the step (2) into a rock core holder, and performing displacement adhesion by using a clay solution B, wherein the confining pressure is set to be 0.3MPa, and the displacement pressure is set to be 0.1 MPa. The displacement attachment time is 10 min;
(6) and taking the glass sphere simulated core out of the core holder, and heating by using a dryer, wherein the heating temperature range is 0-500 ℃, the glass sphere simulated core is firstly heated at 80 ℃ for 1h and then at 120 ℃ for 2h, and finally the simulated core finished product is obtained, as shown in figure 2. In the obtained simulated rock core finished product, the glass spheres are used for simulating rock core particles, the clay solution B is attached to the glass spheres to form a single substance, and the single substance can be subsequently used for researching displacement experiment rules.
The cylindrical die adopted in the step (2) is made of toughened glass, the height of the cylindrical die is 65mm, the inner diameter of the cylindrical die is 25mm, the outer diameter of the cylindrical die is 28mm, and the compressive strength of the cylindrical die is 6 MPa. The pressurizing range of the four-column hydraulic press is 0-30MPa, the compacting pressure is 1MPa, and the continuous pressurizing time is 5 min.
In the step (3), the particle mesh number of the montmorillonite is 1000 meshes, the particle mesh number of the kaolin is 1000 meshes, and the particle mesh number of the chlorite is 1000 meshes.
The core holder in the step (5) is a standard displacement experiment holder, and can provide confining pressure and displacement effects, for example, the core holder structure provided in the Chinese patent application 'a pressure-sensitive multi-scale horizontal seam comprehensive regulation and control simulation experiment device and method' (application number 201811085718X).
According to the technical scheme, the pore throat is changed by using different glass sphere radiuses, the prepared clay solution B is used for displacing the glass sphere core, so that different particle surface properties are obtained, and finally the simulated core finished product is obtained. The influence rule of the surface property of rock particles on the displacement effect when different fluids displace the rock can be explored subsequently for the simulated rock core.
When the simulated core finished product prepared by the embodiment is used for carrying out displacement experiments of different fluids, the displacement results are shown in table 1.
Table 1 contrast table for physical properties of simulated core displacement experiment
| Displacement fluid | Time to begin to go out liquid/s | Total time of dayM/s | Total liquid volume/ml | Flow rate ml/s |
| Deionized water | 3.4 | 60 | 20 | 0.33 |
| 10% NaCl solution | 5.1 | 60 | 16 | 0.27 |
| 20% NaCl solution | 6.2 | 60 | 11 | 0.18 |
| 30% NaCl solution | 7 | 60 | 8 | 0.13 |
The size of the pore is set to the diameter that the rock core of this embodiment was made utilizes the glass ball to can carry out single or more clay material of adhesion to the particle surface, with this in the laboratory experiment probe rock porosity and the influence law of a certain particle surface property to the displacement effect, and whole simulation rock core gets simple, safety, environmental protection, and the preparation raw materials is flat cheap easily getting.
Example 2:
a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties comprises the following steps of 1: selecting glass balls with the radius of 1mm and made of toughened glass in the step (1).
The compacting pressure in the step (2) is 1.5MPa, and the continuous pressurizing time is 5 min.
In the step (3), the mass ratio of the montmorillonite to the kaolin to the chlorite is 1:2: 1. Stirring and mixing time is 5 min.
The content of solute in the clay solution B in the step (4) is 15%.
In the step (5), the confining pressure is set to be 0.5MPa, the displacement pressure is set to be 0.2MPa, and the displacement attachment time is set to be 5 min.
When the simulated core finished product prepared by the embodiment is used for carrying out displacement experiments of different fluids, the displacement results are shown in table 2.
Table 2 contrast table for physical properties of simulated rock core displacement experiment
Example 3:
a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties comprises the following steps of 1: selecting glass balls with the radius of 1.5mm and made of toughened glass in the step (1).
The compacting pressure in the step (2) is 3MPa, and the continuous pressurizing time is 10 min.
In the step (3), the mass ratio of the montmorillonite to the kaolin to the chlorite is 1:2: 3. The particle mesh number of the montmorillonite is 500 meshes, the particle mesh number of the kaolin is 500 meshes, and the particle mesh number of the chlorite is 500 meshes.
In the step (4), the content of solute in the clay solution B is 3%.
In the step (5), the confining pressure is set to be 0.5MPa, and the displacement pressure is set to be 0.3 MPa. The time for displacement attachment was 20 min.
Example 4:
a method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties comprises the following steps of 1: the compacting pressure in the step (2) is 3MPa, and the continuous pressurizing time is 1 min.
In the step (3), the mesh number of the montmorillonite is 1200 meshes, the mesh number of the kaolin is 1200 meshes, and the mesh number of the chlorite is 1200 meshes.
The content of the solute in the clay solution B in the step (4) is 20%.
In the step (5), the confining pressure is set to be 0.2MPa, and the displacement pressure is set to be 0.3 MPa. The time for displacement attachment was 20 min.
Claims (10)
1. A method for manufacturing a simulated rock core with a fixed pore throat and particle surface properties is characterized by comprising the following steps:
(1) selecting glass balls with the radius of 0.5mm-1.5mm for later use;
(2) putting the glass balls into a mould and compacting to obtain a glass ball simulation core;
(3) uniformly stirring and mixing montmorillonite, kaolin and chlorite to form a mixture A, wherein the mass ratio of the montmorillonite to the kaolin to the chlorite is (0.1-1) to (0.1-2) to (0.1-3);
(4) adding water into the mixture A, and stirring to prepare a clay solution B, wherein the content of solute in the clay solution B is 3% -20%;
(5) putting the glass ball simulated core prepared in the step (2) into a core holder, and performing displacement adhesion by using a clay solution B; the rock core holder can provide confining pressure and displacement action, the confining pressure is 0.2-0.5MPa, and the displacement pressure is 0.1-0.3 MPa;
(6) and after the displacement adhesion is finished, taking out the glass ball simulated core from the core holder, and carrying out heating treatment to finally obtain a simulated core finished product.
2. The method for preparing the simulated core with the constant pore throat and the particle surface property as claimed in claim 1, wherein in the step (1), a glass ball made of toughened glass is selected, and the compressive strength is 6 MPa.
3. The method for making a pseudo core with a fixed pore throat and particle surface properties as claimed in claim 1, wherein in step (1), the maximum temperature of the selected glass spheres is 180 ℃.
4. The method for preparing the simulated core with the constant pore throat and the particle surface property as claimed in claim 1, wherein in the step (2), the mold is a cylinder, is made of tempered glass, and has a height of 65mm, an inner diameter of 25mm, an outer diameter of 28mm and a compressive strength of 6 MPa.
5. The method for preparing the simulated core with the fixed pore throat and the particle surface property as claimed in claim 1, wherein in the step (2), a four-column hydraulic press is adopted for compaction, the pressurizing range is 0-30MPa, the compacting pressure is 1-3MPa, and the continuous pressurizing time is 1-10 min.
6. The method for preparing a simulated core with a fixed pore throat and particle surface properties as claimed in claim 1, wherein in the step (3), the particle mesh number of montmorillonite is 500-.
7. The method for preparing a pseudo core with a fixed pore throat and particle surface property as claimed in claim 1, wherein in the step (3), the montmorillonite, the kaolin and the chlorite are stirred and mixed for at least 3 min.
8. The method for making a pseudo core with a fixed pore throat and particle surface property as claimed in claim 1, wherein in the step (4), the water used is deionized water.
9. The method for preparing a pseudo core with a fixed pore throat and particle surface property as claimed in claim 1, wherein in the step (5), the displacement attachment time is 5-20 min.
10. The method for preparing the simulated core with the fixed pore throat and the particle surface property as claimed in claim 1, wherein in the step (6), a dryer is used for heating, the heating temperature range is 0-500 ℃, a step-by-step method is used for heating, the heating is firstly carried out at 80 ℃ for 1h, and then the heating is carried out at 120 ℃ for 2 h.
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