CN107817142B - Shale dual-medium artificial rock core and preparation method thereof - Google Patents
Shale dual-medium artificial rock core and preparation method thereof Download PDFInfo
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- CN107817142B CN107817142B CN201710949124.8A CN201710949124A CN107817142B CN 107817142 B CN107817142 B CN 107817142B CN 201710949124 A CN201710949124 A CN 201710949124A CN 107817142 B CN107817142 B CN 107817142B
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- 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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Abstract
The invention relates to the technical field of petroleum development experiments, in particular to a shale dual-medium artificial rock core and a preparation method thereof, wherein the shale dual-medium artificial rock core is prepared from the following raw materials in percentage by mass based on the total mass of the shale dual-medium artificial rock core: 15-25% of epoxy resin, 25-75% of quartz sand and 10-60% of porous alumina film. The porous alumina film is utilized to simulate a rock matrix, nano pores are provided, the quartz sand provides micro pores, namely two porous media with different seepage capabilities are provided, the characteristics of shale dual porous media under the micro-nano scale can be simulated, and the rock core parameters required by different experiments are met.
Description
Technical Field
The invention relates to the technical field of petroleum development experiments, in particular to a shale dual-medium artificial core with high accuracy and good simulation and a preparation method thereof.
Background
Dual media refers to porous media having two different seepage capabilities simultaneously, such as a fracture-pore type. The rock with the double-medium structure is one of good oil and gas storage places, and research on the physical properties of the double-medium rock can play a guiding role in exploration and development of oil and gas. At present, natural rock cores are obtained mainly by a drilling and coring method, but the natural rock core drilling has the defects of high cost, long period, poor repeatability and the like, the quality is difficult to ensure, and people often use artificial rock cores to perform experimental tests in physical property simulation experiments. In addition, the natural core has strong heterogeneity and anisotropy, and the preparation method of the shale dual-medium artificial core is very important for better simulating the physical properties of the rock of an actual reservoir.
Disclosure of Invention
In order to solve the problems of high acquisition cost and poor repeatability of natural cores in petroleum development experiments, the invention provides the shale dual-medium artificial core with high accuracy and good simulation property, so as to simulate strong heterogeneity and anisotropy of actual stratum rocks and improve the accuracy of the experiments.
The invention also provides a preparation method of the shale dual-medium artificial rock core with simple process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the shale dual-medium artificial rock core takes the total mass of the shale dual-medium artificial rock core as a benchmark, and consists of the following raw materials in percentage by mass: 15-25% of epoxy resin, 25-75% of quartz sand and 10-60% of porous alumina film.
The shale dual-medium artificial rock core prepared by the formula can provide two porous media with different seepage capabilities, and meets rock core parameters required by different experiments. In addition, the materials required for manufacturing the shale dual-medium artificial rock core are conventional materials and have wide sources. The shale is a typical dual porous medium, the artificial core of the shale dual medium meets the characteristics of the shale dual porous medium under the micro-nano scale, and provides an indoor experimental material for the efficient development of shale gas. The action principle of the formula components of the invention is as follows: the porous alumina film is used for simulating a rock matrix, and the quartz sand is used for simulating microcracks to form a dual porous medium, so that the requirements of different petroleum development experiments can be met.
Preferably, the particle size of the quartz sand is 100 to 1200 meshes.
Preferably, the pore diameter of the porous alumina film is 10-100 nm.
A preparation method of a shale dual-medium artificial rock core comprises the following steps:
(1) crushing the porous alumina film, and screening out porous alumina scrap particles;
(2) respectively weighing the epoxy resin, the quartz sand and the porous alumina film scrap particles according to the proportion, mixing and stirring the components uniformly;
(3) placing the mixture into an artificial rock core manufacturing mold, slowly boosting and compacting, standing, releasing pressure and demolding to obtain a blank artificial rock core;
(4) demoulding the blank artificial rock core, putting the blank artificial rock core into a drying box, drying and solidifying the blank artificial rock core, and naturally cooling the blank artificial rock core to normal temperature;
(5) and (4) preparing the finished product of the shale dual-medium artificial rock core by using a rock cutting machine and a polishing machine on the dried and cooled blank artificial rock core.
Preferably, in the step (1), the particle size of the porous alumina crumb particles is 20-100 meshes.
Preferably, in the step (3), the pressure is slowly increased to 5-15 MPa for compaction, and the pressure is released and the die is removed after the mixture is kept stand for 2-5 hours.
Preferably, in the step (4), the drying temperature is 80-120 ℃, and the drying time is 12-24 h.
Therefore, the invention has the following beneficial effects: the porous alumina film is utilized to simulate a rock matrix, nano pores are provided, the quartz sand provides micro pores, namely two porous media with different seepage capabilities are provided, the characteristics of shale dual porous media under the micro-nano scale are truly simulated, and the rock core parameters required by different experiments are met.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples.
In the present invention, all the equipment and materials are commercially available or commonly used in the art, and the methods in the following examples are conventional in the art unless otherwise specified.
Example 1
(1) Crushing a porous alumina film with the aperture of 10nm, and screening out porous alumina scrap particles with the particle size of 20-50 meshes and quartz sand with the particle size of 100-500 meshes;
(2) taking the total mass of the shale dual-medium artificial rock core as a reference, respectively weighing 15% of epoxy resin, 25% of quartz sand and 60% of porous alumina film scrap particles according to the following proportion, mixing and stirring the components uniformly;
(3) placing the mixture into an artificial rock core manufacturing mold, slowly increasing the pressure to 5MPa for compaction, standing for 5h, and then releasing the pressure and demolding to obtain a blank artificial rock core;
(4) the blank artificial rock core is placed into a drying box after being demoulded, dried and solidified, the drying temperature is 80 ℃, the drying time is 24 hours, and the blank artificial rock core is naturally cooled to the normal temperature;
(5) and (4) preparing the finished product of the shale dual-medium artificial rock core by using a rock cutting machine and a polishing machine on the dried and cooled blank artificial rock core.
Example 2
(1) Crushing a porous alumina film with the aperture of 100nm, and screening out porous alumina scrap particles with the particle size of 40-60 meshes and quartz sand with the particle size of 300-700 meshes;
(2) taking the total mass of the shale dual-medium artificial rock core as a reference, respectively weighing 25% of epoxy resin, 45% of quartz sand and 30% of porous alumina film scrap particles according to the following proportion, mixing and stirring the components uniformly;
(3) placing the mixture into an artificial rock core manufacturing mold, slowly increasing the pressure to 15MPa for compaction, standing for 2h, and then releasing the pressure and demolding to obtain a blank artificial rock core;
(4) the blank artificial rock core is placed into a drying box after being demoulded, dried and solidified, the drying temperature is 120 ℃, the drying time is 12 hours, and the blank artificial rock core is naturally cooled to the normal temperature;
(5) and (4) preparing the finished product of the shale dual-medium artificial rock core by using a rock cutting machine and a polishing machine on the dried and cooled blank artificial rock core.
Example 3
(1) Crushing a porous alumina film with the aperture of 50nm, and screening out porous alumina scrap particles with the average particle size of 50-100 meshes and quartz sand with the particle size of 800-1200 meshes;
(2) taking the total mass of the shale dual-medium artificial rock core as a reference, respectively weighing 15% of epoxy resin, 75% of quartz sand and 10% of porous alumina film scrap particles according to the following mixture ratio, mixing and stirring the components uniformly;
(3) placing the mixture into an artificial rock core manufacturing mold, slowly increasing the pressure to 10MPa for compaction, standing for 3h, and then releasing the pressure and demolding to obtain a blank artificial rock core;
(4) the blank artificial rock core is placed into a drying box after being demoulded, dried and solidified, the drying temperature is 100 ℃, the drying time is 16 hours, and the blank artificial rock core is naturally cooled to the normal temperature;
(5) and (4) preparing the finished product of the shale dual-medium artificial rock core by using a rock cutting machine and a polishing machine on the dried and cooled blank artificial rock core.
The microcrack and pore distribution ratios of the shale dual-medium artificial core finished products prepared in the embodiments 1 to 3 of the invention were measured by a nitrogen adsorption method, and the results are shown in table 1:
TABLE 1 test results
As can be seen from table 1, the shale dual-medium artificial rock core in embodiments 1 to 3 of the present invention provides two porous media with different seepage capabilities, can simulate characteristics of shale dual-porous media in micro-nano scale, and meets core parameters required by different experiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (4)
1. The shale dual-medium artificial rock core is characterized in that the shale dual-medium artificial rock core is composed of the following raw materials in percentage by mass based on the total mass of the shale dual-medium artificial rock core: 15-25% of epoxy resin, 25-75% of quartz sand and 10-60% of porous alumina film; the pore diameter of the porous alumina film is 10-100 nm; the particle size of the quartz sand is 100-1200 meshes;
the preparation method of the shale dual-medium artificial rock core comprises the following steps:
(1) crushing the porous alumina film, and screening out porous alumina scrap particles; the particle size of the porous alumina chip particles is 20-100 meshes;
(2) respectively weighing the epoxy resin, the quartz sand and the porous alumina film scrap particles according to the proportion, mixing and uniformly stirring the components;
(3) placing the mixture into an artificial rock core manufacturing mold, slowly increasing the pressure to 5-15 MPa, compacting, standing, releasing the pressure and demolding to obtain a blank artificial rock core;
(4) demoulding the blank artificial rock core, putting the blank artificial rock core into a drying box, drying and solidifying the blank artificial rock core, and naturally cooling the blank artificial rock core to normal temperature;
(5) and (4) preparing the finished product of the shale dual-medium artificial rock core by using a rock cutting machine and a polishing machine on the dried and cooled blank artificial rock core.
2. The method for preparing the shale dual-medium artificial core of claim 1, comprising the steps of:
(1) crushing the porous alumina film, and screening out porous alumina scrap particles;
(2) respectively weighing the epoxy resin, the quartz sand and the porous alumina film scrap particles according to the proportion, mixing and uniformly stirring the components;
(3) placing the mixture into an artificial rock core manufacturing mold, slowly boosting and compacting, standing, releasing pressure and demolding to obtain a blank artificial rock core;
(4) demoulding the blank artificial rock core, putting the blank artificial rock core into a drying box, drying and solidifying the blank artificial rock core, and naturally cooling the blank artificial rock core to normal temperature;
(5) and (4) preparing the finished product of the shale dual-medium artificial rock core by using a rock cutting machine and a polishing machine on the dried and cooled blank artificial rock core.
3. The preparation method of the shale dual-medium artificial core according to claim 2, wherein in the step (3), the pressure is released and the mold is removed after the shale dual-medium artificial core is left for 2-5 hours.
4. The preparation method of the shale dual-medium artificial core according to claim 2, wherein in the step (4), the drying temperature is 80-120 ℃, and the drying time is 12-24 hours.
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| CN104089806B (en) * | 2014-07-17 | 2015-09-09 | 中国石油大学(华东) | A kind of multi-modal pore system structural artificial rock core and preparation method thereof |
| CN104111189B (en) * | 2014-07-31 | 2017-01-11 | 中国石油天然气股份有限公司 | Rock core preparation method |
| CN104326708B (en) * | 2014-10-22 | 2016-11-16 | 杜江民 | A kind of shale reservoir artificial core and preparation method thereof |
| CN106554168A (en) * | 2015-09-28 | 2017-04-05 | 中国石油化工股份有限公司 | Two-phase media artificial core and preparation method thereof and petrophysical model |
| CN105547778A (en) * | 2015-12-17 | 2016-05-04 | 石家庄经济学院 | Preparation method of artificial core in petroleum geology research and application of artificial core |
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Non-Patent Citations (1)
| Title |
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| Assessment of Rock Injectivity by Comparing the Open-hole Well Logging Data with Continuous Rock Core;Chi-WenYu et al.;《Energy Procedia》;20161130;第114卷;第2985-2995页 * |
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