CN111220519A - Standard core model and manufacturing method thereof - Google Patents
Standard core model and manufacturing method thereof Download PDFInfo
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- CN111220519A CN111220519A CN201811409682.6A CN201811409682A CN111220519A CN 111220519 A CN111220519 A CN 111220519A CN 201811409682 A CN201811409682 A CN 201811409682A CN 111220519 A CN111220519 A CN 111220519A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000011148 porous material Substances 0.000 claims abstract description 121
- 230000001788 irregular Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims description 54
- 238000010146 3D printing Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 abstract description 34
- 238000005065 mining Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
- 238000002474 experimental method Methods 0.000 description 38
- 239000012530 fluid Substances 0.000 description 22
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- 230000001066 destructive effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a standard core model and a manufacturing method thereof, wherein the standard core model is a cylinder, the standard core model internally comprises a standard pore structure, the top surface and the bottom surface of the standard core model are respectively provided with at least one round hole, and the standard pore structure comprises: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more; the positional relationship between the apertures includes: the pores are mutually crossed to form an included angle or the pores are mutually parallel. The standard core model provided by the embodiment of the invention contains the standard pore structure inside, so that when the change rule of the seepage parameter is researched, the change rule of the seepage parameter is favorably summarized, and the interference of experimental data caused by the damage of a core part and the change of an internal structure in the mining process is avoided.
Description
Technical Field
The invention relates to the technical field of compact oil and gas development experiments, in particular to a standard core model and a manufacturing method thereof.
Background
The reserves of the compact oil and gas in China are rich, but the exploitation amount is small so far, wherein the important reason is that the geological micro-flowing rule of the compact oil and gas reservoirs in China is not mastered. At present, for the research of the geological micro-flow rule of a compact oil and gas reservoir, a real core is mainly adopted for experiment, the core is placed in a core clamping system, fluid is injected from one end of the core, the seepage parameters such as the speed and the pressure of the fluid exhaust are monitored at the other end of the core, and the change rule of the seepage parameters of the pore structures of the cores when different fluids are injected is researched by replacing different fluids, so that the geological micro-flow rule of the compact oil and gas reservoir is analyzed. However, the real core needs thousands of dollars of investment for well drilling and is taken out from the underground, and the number of the cores is very limited, so that the experiment cost is too high; furthermore, experiments for researching the geological micro-flow rule of a compact oil and gas reservoir are usually destructive, when the change rule of seepage parameters when different fluids are injected into a core pore structure is researched, if repeated experiments are carried out on the same core, different fluids are injected into the core pore structure in sequence for research so as to obtain a comparison experiment result, because the fluid injected first already damages the internal structure of the core, and then other types of fluids are injected for experiments, the obtained experiment results are possibly inaccurate, and the real core structures obtained by mining are different, so that the cores with the same structure are hardly found for the comparison experiment; in addition, part of the internal structure of some mined real cores is changed due to partial damage, which brings great difficulty to the research of the geological micro-flow rule of the compact oil and gas reservoir.
Disclosure of Invention
The embodiment of the invention provides a standard core model manufacturing method, which is used for obtaining a standard core model, so that a comparison experiment for researching a geological micro-flow rule of a compact oil and gas reservoir is facilitated, an accurate experiment result is obtained, and a reliable geological micro-flow rule of the compact oil and gas reservoir is summarized, and the method comprises the following steps:
scanning the rock core sample to obtain a three-dimensional digital rock core;
extracting a standard pore structure in the three-dimensional digital core;
3D printing a rock core model with a standard pore structure to obtain a standard rock core model;
wherein the standard pore structure comprises: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more.
According to the embodiment of the invention, the three-dimensional digital rock core is obtained by scanning the rock core sample, the standard pore structure in the three-dimensional digital rock core is extracted, and the rock core model with the standard pore structure is printed in a 3D mode, so that the standard rock core model is obtained. According to the embodiment of the invention, the 3D printing technology is adopted to print the rock core model, a plurality of rock core models with the same pore structure can be manufactured, thousands of elements of investment are not needed to drill and mine a real rock core, the experiment cost is effectively saved, different fluids can be respectively injected into the manufactured rock core models with the same pore structure and the change rule of the seepage parameter can be researched when the change rule of the seepage parameter when different fluids are injected into one rock core pore structure, and the problems that a comparison experiment is difficult to develop when the real rock core is adopted to perform an experiment and the experiment result is inaccurate are effectively solved. In addition, according to the embodiment of the invention, the standard pore structure is selected from the three-dimensional digital rock core obtained by scanning, then the 3D printing technology is utilized to print the rock core model with the standard pore structure, and when the rock core model with the standard pore structure is adopted to research the change rule of the seepage parameters, the change rule of the seepage parameters is favorably summarized due to the representative and universal pore structure, so that the interference of experimental data caused by the partial damage of the rock core and the change of the internal structure in the mining process is avoided, and an accurate experimental conclusion cannot be obtained.
The embodiment of the invention provides a standard core model, which is used for performing a comparison experiment on the research of the geological micro-flow rule of a compact oil and gas reservoir to obtain an accurate experiment result and summarize the reliable geological micro-flow rule of the compact oil and gas reservoir, wherein the standard core model is a cylinder, the standard core model internally comprises a standard pore structure, the top surface and the bottom surface of the standard core model are respectively provided with at least one circular hole, and the standard pore structure comprises: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more; the positional relationship between the apertures includes: the pores are mutually crossed to form an included angle or the pores are mutually parallel.
According to the embodiment of the invention, the standard pore structure is contained in the standard core model, when the core model with the standard pore structure is adopted to research the change rule of the seepage parameters, the representative and universality of the pore structure is beneficial to summarizing the change rule of the seepage parameters, and the interference of experimental data caused by the partial damage of the core and the change of the internal structure in the mining process is avoided, so that an accurate experimental conclusion cannot be obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic diagram of a standard core model manufacturing process in an embodiment of the invention;
FIGS. 2A-2C are schematic diagrams of a single pore in a standard pore structure in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of a standard core model in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In order to obtain a standard core model, which is used for developing a comparison experiment for researching a geological micro-flow rule of a tight oil and gas reservoir, obtaining an accurate experiment result, and summarizing a reliable geological micro-flow rule of the tight oil and gas reservoir, an embodiment of the invention provides a standard core model manufacturing method, as shown in fig. 1, the method may include:
102, extracting a standard pore structure in the three-dimensional digital core;
103, 3D printing a rock core model with a standard pore structure to obtain a standard rock core model;
wherein the standard pore structure comprises: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more.
As can be seen from fig. 1, in the embodiment of the present invention, a three-dimensional digital core is obtained by scanning a core sample, a standard pore structure in the three-dimensional digital core is extracted, and a core model having the standard pore structure is 3D printed, so as to obtain a standard core model. The applicant finds that at present, for the research of the geological micro-flow rule of the compact oil and gas reservoir, a real core is mainly adopted for experiment, the core is placed in a core clamping system, fluid is injected from one end of the core, seepage parameters such as the speed and the pressure of fluid discharge are monitored at the other end of the core, and the change rule of the seepage parameters of pore structures of the cores when different fluids are injected is researched by replacing different fluids, so that the geological micro-flow rule of the compact oil and gas reservoir is analyzed. However, the real core needs thousands of dollars of investment for well drilling and is taken out from the underground, and the number of the cores is very limited, so that the experiment cost is too high; furthermore, experiments for researching the geological micro-flow rule of a compact oil and gas reservoir are usually destructive, when the change rule of seepage parameters when different fluids are injected into a core pore structure is researched, if repeated experiments are carried out on the same core, different fluids are injected into the core pore structure in sequence for research so as to obtain a comparison experiment result, because the fluid injected first already damages the internal structure of the core, and then other types of fluids are injected for experiments, the obtained experiment results are possibly inaccurate, and the real core structures obtained by mining are different, so that the cores with the same structure are hardly found for the comparison experiment; in addition, part of the internal structure of some mined real cores is changed due to partial damage, which brings great difficulty to the research of the geological micro-flow rule of the compact oil and gas reservoir. Therefore, the embodiment of the invention adopts the 3D printing technology to print the rock core model, can manufacture a plurality of rock core models with the same pore structure, does not need to invest thousands of yuan to drill and mine a real rock core, effectively saves the experiment cost, can respectively inject different fluids into a plurality of manufactured rock core models with the same pore structure and research the change rule of the seepage parameter when researching the change rule of the seepage parameter when different fluids are injected into one rock core pore structure, and effectively overcomes the problems that the contrast experiment is difficult to develop when the real rock core is adopted to carry out the experiment and the experiment result is inaccurate. In addition, according to the embodiment of the invention, the standard pore structure is selected from the three-dimensional digital rock core obtained by scanning, then the 3D printing technology is utilized to print the rock core model with the standard pore structure, and when the rock core model with the standard pore structure is adopted to research the change rule of the seepage parameters, the change rule of the seepage parameters is favorably summarized due to the representative and universal pore structure, so that the interference of experimental data caused by the partial damage of the rock core and the change of the internal structure in the mining process is avoided, and an accurate experimental conclusion cannot be obtained.
In specific implementation, the core sample is scanned to obtain the three-dimensional digital core. In an embodiment, the core sample may be scanned by using an electronic Computed Tomography (CT) scanning technique or a focused scanning technique to obtain a three-dimensional digital core of the core sample.
In specific implementation, after the three-dimensional digital rock core is obtained, a standard pore structure in the three-dimensional digital rock core is extracted, wherein the standard pore structure comprises: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more, as shown in fig. 2A-2C. The inventor finds that the real rock core structures obtained by mining are different, and the rock cores with the same structures are hardly found for comparison experiments; in addition, part of the internal structure of some mined real cores is changed due to partial damage, which brings great difficulty to the research of the geological micro-flow rule of the compact oil and gas reservoir. According to the embodiment of the invention, the standard pore structure is selected from the scanned three-dimensional digital rock core, and when the rock core model with the standard pore structure is adopted to research the change rule of the seepage parameters, the representative and universality of the pore structure is beneficial to summarizing the change rule of the seepage parameters, so that the interference of experimental data caused by the partial damage of the rock core and the change of the internal structure in the mining process is avoided, and an accurate experimental conclusion cannot be obtained.
In an example, in the standard pore structure, the average value of the pore diameters of all pores is within a first set range, and the first set range may be 50nm to 500 μm.
In an embodiment, in the standard pore structure, an angle formed between the pores is within a second predetermined range, and the second predetermined range may be 0 degree to 360 degrees.
In specific implementation, after a standard pore structure in a three-dimensional digital core is extracted, a core model with the standard pore structure is printed in a 3D mode, and the standard core model is obtained.
It should be noted that the 3D printing technology is the prior art, and those skilled in the art can understand the 3D printing technology by referring to the data, and the present invention is not described in detail.
Based on the same inventive concept, the embodiment of the present invention also provides a standard core model, as described in the following embodiments.
The embodiment of the invention provides a standard core model which is used for performing a comparison experiment on the research of the geological micro-flow rule of a compact oil and gas reservoir, obtaining an accurate experiment result and summarizing the reliable geological micro-flow rule of the compact oil and gas reservoir. As shown in fig. 3, this standard core model is the cylinder, and inside the containing standard pore structure of standard core model, standard core model top surface and bottom surface respectively have at least one circular port, and wherein, standard pore structure includes: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more; the positional relationship between the apertures includes: the pores are mutually crossed to form an included angle or the pores are mutually parallel.
In one embodiment, the standard pore structure has an average value of pore diameters of all pores within a first set range.
In one embodiment, the first predetermined range is 50nm to 500 μm.
In one embodiment, the standard pore structure has an included angle between pores within a second predetermined range.
In one embodiment, the second setting range is 0 degrees to 360 degrees.
According to the embodiment of the invention, the standard pore structure is contained in the standard core model, when the core model with the standard pore structure is adopted to research the change rule of the seepage parameters, the representative and universality of the pore structure is beneficial to summarizing the change rule of the seepage parameters, and the interference of experimental data caused by the partial damage of the core and the change of the internal structure in the mining process is avoided, so that an accurate experimental conclusion cannot be obtained.
In summary, in the embodiment of the present invention, a three-dimensional digital core is obtained by scanning a core sample, a standard pore structure in the three-dimensional digital core is extracted, and a core model with the standard pore structure is 3D printed, so as to obtain a standard core model. According to the embodiment of the invention, the 3D printing technology is adopted to print the rock core model, a plurality of rock core models with the same pore structure can be manufactured, thousands of elements of investment are not needed to drill and mine a real rock core, the experiment cost is effectively saved, different fluids can be respectively injected into the manufactured rock core models with the same pore structure and the change rule of the seepage parameter can be researched when the change rule of the seepage parameter when different fluids are injected into one rock core pore structure, and the problems that a comparison experiment is difficult to develop when the real rock core is adopted to perform an experiment and the experiment result is inaccurate are effectively solved. In addition, according to the embodiment of the invention, the standard pore structure is selected from the three-dimensional digital rock core obtained by scanning, then the 3D printing technology is utilized to print the rock core model with the standard pore structure, and when the rock core model with the standard pore structure is adopted to research the change rule of the seepage parameters, the change rule of the seepage parameters is favorably summarized due to the representative and universal pore structure, so that the interference of experimental data caused by the partial damage of the rock core and the change of the internal structure in the mining process is avoided, and an accurate experimental conclusion cannot be obtained.
In the embodiment, the standard core model internally comprises a standard pore structure, and when the core model with the standard pore structure is used for researching the change rule of the seepage parameters, the representative and universality of the pore structure is favorable for summarizing the change rule of the seepage parameters, so that the interference of experimental data caused by the partial damage of the core and the change of the internal structure in the mining process is avoided, and an accurate experimental conclusion cannot be obtained.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of making a standard core model, comprising:
scanning the rock core sample to obtain a three-dimensional digital rock core;
extracting a standard pore structure in the three-dimensional digital core;
3D printing a rock core model with a standard pore structure to obtain a standard rock core model;
wherein the standard pore structure comprises: the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more.
2. The method of claim 1, wherein the standard pore structure has an average pore size of all pores within a first set range.
3. The method of claim 2, wherein the first set range is 50nm to 500 μm.
4. The method of claim 1, wherein the standard pore structure includes a second predetermined angle between pores.
5. The method of claim 4, wherein the second set range is 0 degrees to 360 degrees.
6. The utility model provides a standard core model, its characterized in that, standard core model is the cylinder, and standard core model is inside to contain standard pore structure, and standard core model top surface and bottom surface respectively have at least one circular port, wherein, standard pore structure includes:
the single pore is a regular or irregular cylindrical structure, the regular cylindrical structure is that all cross sections of the pore are circular and have the same radius, and the irregular cylindrical structure is that all cross sections of the pore are circular and the radius value of each cross section is two or more;
the positional relationship between the apertures includes: the pores are mutually crossed to form an included angle or the pores are mutually parallel.
7. The model of claim 6, wherein the standard pore structure has an average pore size of all pores within a first set range.
8. The model of claim 7, wherein said first set range is between 50nm and 500 μm.
9. The mold of claim 6, wherein the standard pore structure includes pores that are angled within a second predetermined range.
10. The model of claim 9, wherein said second set range is 0 degrees to 360 degrees.
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| CN106227943A (en) * | 2016-07-26 | 2016-12-14 | 中国石油大学(华东) | The random pore of a kind of two dimension different surface roughness generates method |
| CN111208052A (en) * | 2020-02-28 | 2020-05-29 | 西安石油大学 | Shale reservoir permeability prediction method based on improved Kozeny-Carman model |
| CN111208051A (en) * | 2020-02-28 | 2020-05-29 | 西安石油大学 | Shale reservoir permeability dynamic prediction method under synergistic effect of complex mechanism |
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2018
- 2018-11-23 CN CN201811409682.6A patent/CN111220519A/en active Pending
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|---|---|---|---|---|
| CN101587055A (en) * | 2009-04-13 | 2009-11-25 | 中国科学院武汉岩土力学研究所 | Standard test piece based on calibration permeability test |
| CN103698803A (en) * | 2012-09-27 | 2014-04-02 | 中国石油天然气股份有限公司 | Blowhole structural characterization method and device |
| US20160063150A1 (en) * | 2013-04-12 | 2016-03-03 | Schlumberger Technology Corporation | Enhanced oil recovery using digital core sample |
| US20160194940A1 (en) * | 2013-08-13 | 2016-07-07 | Schlumberger Technology Corporation | Digital core sensitivity analysis |
| CN104729904A (en) * | 2015-03-31 | 2015-06-24 | 中国石油大学(华东) | Complicated rock core preparation method based on CT scanning and 3D printing |
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