CN114720343A - Rock hole fracture network connectivity characterization device and characterization method thereof - Google Patents
Rock hole fracture network connectivity characterization device and characterization method thereof Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims abstract description 59
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- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
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- 239000002023 wood Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
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- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Abstract
The invention provides a rock pore fracture network connectivity characterization device and a characterization method, the device comprises a pressurizing container, a vacuumizing assembly and a pressurizing assembly, the pressurizing container comprises a heating cylinder, a heating sleeve is arranged in the side wall of the heating cylinder, two ends of the heating cylinder are respectively provided with a sealing head, a sample chamber is formed between the two sealing heads, a pressurizing piston, a rock sample and characterization alloy are arranged in the sample chamber, and the vacuumizing assembly and the pressurizing assembly are respectively connected with the two sealing heads. The invention has the beneficial effects that: according to the method, the characterization alloy is liquefied through a high-pressure and high-temperature environment, is injected into a pore crack structure of a rock sample, and is observed through a scanning electron microscope of the injected alloy shale sample, so that the network connectivity of the shale pore crack structure and the effective occurrence space of oil gas can be visually and quantitatively characterized; the device can simplify the process of network connectivity characterization of the shale pore structure, reduce the operation difficulty of the device and improve the efficiency of network connectivity characterization of the shale pore structure.
Description
Technical Field
The invention relates to the technical field of unconventional oil and gas experiments, in particular to a rock pore fracture network connectivity characterization device and a characterization method thereof.
Background
The shale oil resource amount in China is huge, and the shale oil resource amount has huge exploration space and wide exploration prospect, however, whether the shale reservoir can become an effective oil production layer or not is whether the oil can effectively flow in the shale matrix or not. No matter how complex the fracture network is formed by the fracturing process, the communicated matrix pores only account for a small part of the total pores, and most of oil and gas needs to seep into natural fractures or artificial fractures through the matrix pore network to form effective energy production. Meanwhile, the problems of low shale oil recovery rate, fast yield decrease and the like in the shale oil development process are all related to the pore-gap connectivity in the shale reservoir, and the research on the quantitative characterization and the cause mode of the pore-gap connectivity of the shale reservoir can provide effective theoretical and application support for shale oil reservoir reconstruction and sustainability development. Therefore, the key scientific problem which needs to be solved urgently is to establish an evaluation index system for the supply capacity of shale oil from a shale matrix to cracks by aiming at quantitative-visual representation of shale crack occurrence, distribution and pore gap connectivity under the condition of developing stratum of a shale oil reservoir, to clarify the effectiveness of the shale cracks.
At present, the connectivity characterization of a shale hole fracture structure is mostly carried out by adopting a slice scanning mode, and the process is as follows: the shale pore fracture structure connectivity characterization method has the advantages that the section of the shale sample is cut to obtain the two-dimensional image of the shale pore fracture structure, the purpose of connectivity characterization of the shale pore fracture structure is achieved through the two-dimensional images, the shale pore fracture structure is characterized in a two-dimensional section mode, the characterization result accuracy is not enough, and meanwhile, the characterization mode is complex in operation process, time-consuming and labor-consuming.
Disclosure of Invention
In order to improve the accuracy of the connectivity characterization of the shale pore crack structure, simplify the process of improving the connectivity characterization of the shale pore crack structure and reduce the operation difficulty, the invention provides a device for characterizing the connectivity of a rock pore crack network, which comprises a pressurizing container, a vacuumizing assembly and a pressurizing assembly;
the pressurizing container comprises a heating cylinder body, a heating sleeve is arranged in the side wall of the heating cylinder body, two ends of the heating cylinder body are respectively provided with a blocking head, the two blocking heads respectively block two ends of the heating cylinder body, a sample chamber is formed between the two blocking heads, a pressurizing piston, a rock sample and a characterization alloy are arranged in the sample chamber,
the vacuumizing assembly and the pressurizing assembly are respectively connected with the two plugging heads, and are both communicated with the sample chamber;
the vacuumizing assembly is used for vacuumizing the sample chamber, and the heating sleeve is used for heating the sample chamber to melt the characterization alloy;
the pressurizing assembly is used for pressurizing the sample chamber, pushing the pressurizing piston to move and pressing the melted characterization alloy into a hole crack structure of the rock sample.
Furthermore, the two plugging heads are an upper plugging head and a lower plugging head respectively, the vacuumizing group comprises a vacuumizing pump, a vacuum container and a vacuumizing pipe, the vacuumizing pump is connected with the vacuum container, the vacuumizing pipe is connected with the upper plugging head and the vacuum container, and the vacuumizing pipe is provided with a vacuumizing valve.
Furthermore, a vacuum meter is arranged at the upper end of the vacuum container, and an emptying valve is arranged at the lower end of the vacuum container.
Further, the pressurizing assembly comprises a pressurizing pump, a pressurizing pipe and a pressurizing valve, the pressurizing pipe is connected with the lower plugging head and the pressurizing pump, and the pressurizing valve is arranged on the pressurizing pipe.
Furthermore, a pressure relief valve is further arranged on the pressurizing pipe and located between the lower plugging head and the pressurizing valve.
Further, the characterization alloy within the sample chamber is located between the pressurization piston and the rock sample, the pressurization piston is located below the characterization alloy, and the rock sample is located above the characterization alloy.
Further, a temperature controller is connected outside the heating cylinder body, the temperature controller is connected with the heating sleeve, and the temperature controller controls the heating temperature of the heating sleeve so as to control the temperature in the sample chamber.
Further, the characterized alloy is a wood alloy.
The invention also provides a rock pore fracture network connectivity characterization method based on the rock pore fracture network connectivity characterization device, which comprises the following steps:
s1, sample loading and device assembling: opening a plugging head of the pressurizing container, sequentially putting the solid characterization alloy and the rock sample on the pressurizing piston in the sample chamber, and then installing the plugging head and completing the assembly of the device;
s2, vacuumizing a sample chamber: opening a vacuumizing valve, starting a vacuumizing pump, vacuumizing the sample chamber, and closing the vacuumizing valve and the vacuumizing pump after vacuumizing is finished;
s3, heating up and melting to characterize alloy: the heating of the heating sleeve is controlled by a temperature controller, so that the temperature in the sample chamber is increased, and the characterization alloy is melted to be in a liquid state;
s4, pressing the liquid characterization alloy into a hole crack structure of the rock sample: opening a pressurizing valve, pressurizing the sample chamber through a pressurizing pump, enabling high-pressure oil to enter the sample chamber and push a pressurizing piston to move upwards, and enabling the pressure of the sample chamber to reach a target value; pressurizing the piston to press the liquid characterization alloy into a hole crack structure of the rock sample;
s5, temperature reduction, pressure relief and sampling: maintaining the pressure of the sample chamber for 5-60min, controlling the heating sleeve to stop heating through the temperature controller, cooling and solidifying the characterization alloy in the sample chamber, opening the pressure relief valve to relieve the pressure after the characterization alloy is solidified, and opening the blocking head to take out the rock sample;
s6, visual representation: and scanning the taken rock sample to obtain the form of the characteristic alloy in the rock sample, so that the connectivity of the pore crack structure in the rock sample is visually represented.
The device and the method for characterizing the connectivity of the rock pore fracture network have the beneficial effects that: according to the characterization method for the connectivity of the rock pore fracture network, the characterization alloy is pressed into the pore fracture structure of the shale sample after being melted, and the characterization alloy form of the shale sample is obtained in an electron microscope scanning mode, so that the shale pore fracture structure and the effective occurrence space of oil and gas are visualized and quantitatively characterized, and the accuracy of the characterization of the connectivity of the rock pore fracture network is improved. The device for representing the connectivity of the rock pore fracture structure can conveniently and quickly inject the liquid characterization alloy into the pore fracture structure of the rock sample under the high-pressure and high-temperature environment, so that the pore fracture structure of the rock sample is conveniently and visually characterized in a scanning mode, the process of representing the connectivity of the shale pore fracture structure is simplified, the operation difficulty of the device is reduced, and the efficiency of representing the connectivity of the shale pore fracture structure is improved.
Drawings
Fig. 1 is a schematic overall structure diagram of a rock pore fracture network connectivity characterization device according to the present invention.
FIG. 2 is a first effect diagram of a rock sample pore fracture structure obtained by the method for characterizing connectivity of a rock pore fracture network of the present invention.
FIG. 3 is a second effect diagram of a rock sample pore fracture structure obtained by the method for characterizing connectivity of a rock pore fracture network of the present invention.
In the above figures: 1-heating cylinder body, 11-sealing head, 12-sample chamber, 13-temperature controller, 3-rock sample, 4-characterization alloy, 5-pressure pump, 51-pressure pipe, 52-pressure release valve, 53-pressure valve, 6-vacuum pump, 61-vacuum pipe, 62-vacuum valve, 63-vacuum meter and 64-vent valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, a rock pore fracture network connectivity characterization device of the present invention includes a pressurized container, a vacuum pumping assembly, and a pressurizing assembly.
The pressurizing container comprises a heating cylinder body 1, wherein the heating cylinder body 1 is a hollow round pipe body, in the embodiment, the heating cylinder body 1 is made of titanium alloy, the size of an inner cavity of the heating cylinder body is phi 30mm x 80mm, and the design pressure of the heating cylinder body is 200 Mpa; the characterization device comprises a heating cylinder body 1, wherein a heating sleeve (not shown in the figure) is arranged in the side wall of the heating cylinder body 1, two ends of the heating cylinder body 1 are respectively provided with a sealing head 11, the two sealing heads 11 respectively seal the two ends of the heating cylinder body 1, a sample chamber 12 is formed between the two sealing heads 1, a pressurizing piston 3 is arranged in the sample chamber 12, the edge of the pressurizing piston 3 is provided with a sealing ring, the pressurizing piston 3 can axially slide along the sample chamber 12, when the characterization device works, a rock sample 3 and a characterization alloy 4 are arranged in the sample chamber 12, the characterization alloy 4 is positioned between the rock sample 3 and the pressurizing piston 3, the rock sample 3 is a shale block to be characterized, the characterization alloy 4 is a wood alloy with a lower melting point, the wood alloy is an alloy composed of tin, indium, bismuth and lead elements, the melting point is 40-80 ℃, and the wood alloy is solid at normal temperature.
The vacuumizing assembly and the pressurizing assembly are respectively connected with the two plugging heads 11 and are both communicated with the sample chamber 12; specifically, the two plugging heads are an upper plugging head and a lower plugging head respectively, the upper plugging head and the lower plugging head are both provided with air guide holes in the axial direction, the vacuumizing group comprises a vacuumizing pump 6, a vacuum container and a vacuumizing tube 61, the vacuumizing tube 61 is connected with the upper plugging head and the vacuum container, and the vacuumizing tube 61 is provided with a vacuumizing valve 62; the pressurizing assembly comprises a pressurizing pump 5, a pressurizing pipe 51 and a pressurizing valve 53, the pressurizing pipe 51 is connected with the lower blocking head and the pressurizing pump 5, the pressurizing valve 53 is arranged on the pressurizing pipe 51, and in the embodiment, the pressurizing pump 5 can be a hydraulic pump or a hand pump. The vacuumizing assembly is used for vacuumizing the sample chamber 12, and the heating sleeve is used for heating the sample chamber 12 to melt the characterization alloy 4; the pressurizing assembly is used for pressurizing the sample chamber 12, pushing the pressurizing piston 2 to move, and pressing the melted characterization alloy 4 into the pore structure of the rock sample 3, so that the pore structure of the rock sample 3 is conveniently and visually characterized in a scanning mode.
Further, a vacuum gauge 63 is arranged at the upper end of the vacuum container, and an emptying valve 64 is arranged at the lower end of the vacuum container. The pressure pipe 51 is provided with a pressure gauge, and the vacuum gauge 63 and the pressure gauge are respectively used for displaying the vacuum degree and the pressure in the sample chamber 12.
Further, a pressure relief valve 52 is further arranged on the pressurizing pipe 51, the pressure relief valve 52 is located between the lower plugging head and the pressurizing valve 53, the pressure relief valve 52 has two functions of active pressure relief and passive pressure relief, and active pressure relief means that the pressure in the sample chamber is actively relieved after high-pressure loading is completed; the passive pressure reduction is to prevent the pressure loaded by the booster pump 5 from being too high during the pressurization process, and when the pressure in the sample chamber 12 exceeds the limit pressure, the pressure relief valve 52 is automatically opened to complete the pressure relief process, and the limit pressure is 30000 psia.
Further, a temperature controller 13 is connected to the outside of the heating cylinder 1, the temperature controller 13 is connected to the heating jacket, and the temperature controller 13 controls the heating temperature of the heating jacket, so as to control the temperature in the sample chamber 12.
The method for representing the connectivity of the rock pore fracture network can visually represent the connectivity of the pore fracture network in a rock sample, and needs to melt a representation alloy 4 and press the representation alloy 4 into a pore fracture structure in a sample 3, and then visually present the pore fracture structure in a scanning mode, wherein the process of melting and pressing the representation alloy 4 into the pore fracture structure in the rock sample 4 is realized by the device, and the method for representing the connectivity of the rock pore fracture network specifically comprises the following steps:
s1, sample loading and device assembling: opening a sealing head of the pressurizing container 1, sequentially putting the solid characterization alloy 4 and the rock sample 3 on the pressurizing piston 2 in the sample chamber 12, and then installing the sealing head 11 and completing the device assembly;
s2, vacuumizing the sample chamber 12: opening the vacuum-pumping valve 62, starting the vacuum-pumping pump 6, pumping out air in the sample chamber 12, and closing the vacuum-pumping valve 62 and the vacuum-pumping pump 6 after the vacuum pumping is finished;
s3, heating up and melting to characterize alloy 4: the heating of the heating sleeve is controlled by the temperature controller 13, the temperature in the sample chamber 12 is increased to a target temperature, and the characterization alloy 4 is melted to be in a liquid state; the target temperature is preferably 200 ℃;
s4, pressing the liquid characterization alloy into a hole crack structure of the rock sample: opening a pressurizing valve, pressurizing the sample chamber 12 through a pressurizing pump 5, enabling high-pressure oil to enter the sample chamber 12, pushing a pressurizing piston 2 to move upwards, and enabling the pressure in the sample chamber 12 to reach a target value; the pressurizing piston 2 presses the liquid characterization alloy 4 into a hole crack structure of the rock sample 3;
in step S4, a hydraulic pump may be used to quickly increase the pressure in the sample chamber 12 by the pressure pump 5, and when the pressure in the sample chamber 12 reaches a certain height, the pressure is increased to a target pressure by a hand pump at a constant speed.
S5, temperature reduction, pressure relief and sampling: maintaining the pressure of the sample chamber 12 for 5-60min, controlling the heating sleeve to stop heating through the temperature controller 13, cooling and solidifying the characterization alloy in the sample chamber 12, and opening the pressure release valve 52 to release the pressure after the characterization alloy 4 is solidified; opening the plugging head 11 to take out the rock sample 3;
s6, visual representation: and scanning the taken rock sample 3 through a scanning electron microscope to obtain the form of the characterization alloy 4 in the rock sample, so as to visually characterize the pore crack structure in the rock sample 3 and obtain the network connectivity information of the pore crack structure.
Referring to fig. 2 and fig. 3, fig. 2 and fig. 3 are graphs showing the effect of the connectivity of the rock sample pore fracture network obtained by the characterization method for the connectivity of the rock pore fracture network according to the present invention.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The embodiments and features of the embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A rock pore fracture network connectivity characterization device is characterized in that: comprises a pressurized container, a vacuum-pumping component and a pressurizing component,
the pressurizing container comprises a heating cylinder, a heating sleeve is arranged in the side wall of the heating cylinder, two ends of the heating cylinder are respectively provided with a blocking head, the two blocking heads respectively block two ends of the heating cylinder, a sample chamber is formed between the two blocking heads, a pressurizing piston, a rock sample and a characterization alloy are arranged in the sample chamber,
the vacuumizing assembly and the pressurizing assembly are respectively connected with the two plugging heads, and are both communicated with the sample chamber;
the vacuumizing assembly is used for vacuumizing the sample chamber, and the heating sleeve is used for heating the sample chamber to melt the characterization alloy;
the pressurizing assembly is used for pressurizing the sample chamber, pushing the pressurizing piston to move and pressing the melted characterization alloy into a hole crack structure of the rock sample.
2. The apparatus for characterizing connectivity of a rock pore fracture network according to claim 1, wherein: the two plugging heads are an upper plugging head and a lower plugging head respectively, the vacuumizing group comprises a vacuumizing pump, a vacuum container and a vacuumizing pipe, the vacuumizing pump is connected with the vacuum container, the vacuumizing pipe is connected with the upper plugging head and the vacuum container, and the vacuumizing pipe is provided with a vacuumizing valve.
3. The apparatus for characterizing connectivity of a rock pore fracture network according to claim 2, wherein: the upper end of the vacuum container is provided with a vacuum meter, and the lower end of the vacuum container is provided with an emptying valve.
4. The apparatus according to claim 3, wherein: the pressurizing assembly comprises a pressurizing pump, a pressurizing pipe and a pressurizing valve, the pressurizing pipe is connected with the lower plugging head and the pressurizing pump, and the pressurizing valve is arranged on the pressurizing pipe.
5. The apparatus for characterizing connectivity of a rock pore fracture network according to claim 4, wherein: and the pressurizing pipe is also provided with a pressure relief valve, and the pressure relief valve is positioned between the lower plugging head and the pressurizing valve.
6. The apparatus for characterizing connectivity of a rock pore fracture network according to claim 5, wherein: the characterization alloy in the sample chamber is located between the pressurizing piston and the rock sample, the pressurizing piston is located below the characterization alloy, and the rock sample is located above the characterization alloy.
7. The apparatus for characterizing connectivity of a rock pore fracture network according to claim 6, wherein: the heating device is characterized in that a temperature controller is connected outside the heating cylinder body and connected with the heating sleeve, and the temperature controller controls the heating temperature of the heating sleeve so as to control the temperature in the sample chamber.
8. The apparatus according to claim 7, wherein: the characterized alloy is a wood alloy.
9. A rock pore fracture network connectivity characterization method based on the rock pore fracture network connectivity characterization device of claims 7-8, characterized in that: the method comprises the following steps:
s1, sample loading and device assembling: opening a plugging head of the pressurizing container, sequentially putting the solid characterization alloy and the rock sample on the pressurizing piston in the sample chamber, and then installing the plugging head and completing the assembly of the device;
s2, vacuumizing a sample chamber: opening a vacuum pumping valve, starting a vacuum pumping pump, pumping air in the sample chamber, and closing the vacuum pumping valve and the vacuum pumping pump after the vacuum pumping is finished;
s3, heating up and melting to characterize alloy: the heating of the heating sleeve is controlled by a temperature controller, so that the temperature in the sample chamber is increased, and the characterization alloy is melted to be in a liquid state;
s4, pressing the liquid characterization alloy into a hole crack structure of the rock sample: opening a pressurizing valve, pressurizing the sample chamber through a pressurizing pump, enabling high-pressure oil to enter the sample chamber and push a pressurizing piston to move upwards, and enabling the pressure of the sample chamber to reach a target value; pressurizing the piston to press the liquid characterization alloy into a hole crack structure of the rock sample;
s5, temperature reduction, pressure relief and sampling: maintaining the pressure of the sample chamber for 5-60min, controlling the heating sleeve to stop heating through the temperature controller, cooling and solidifying the characterization alloy in the sample chamber, opening the pressure relief valve to relieve the pressure after the characterization alloy is solidified, and opening the blocking head to take out the rock sample;
s6, visual representation: and scanning the taken rock sample to obtain the form of the characteristic alloy in the rock sample, so that the network connectivity of the pore crack structure in the rock sample is visually represented.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210165986.2A CN114720343A (en) | 2022-02-23 | 2022-02-23 | Rock hole fracture network connectivity characterization device and characterization method thereof |
| GB2302262.7A GB2616730B (en) | 2022-02-23 | 2023-02-17 | A rock pore-fracture network connectivity characterization device and its characterization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2616730A (en) * | 2022-02-23 | 2023-09-20 | Univ Northeast Petroleum | A rock pore-fracture network connectivity characterization device and its characterization method |
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| CN115615774A (en) * | 2021-07-15 | 2023-01-17 | 中国石油天然气股份有限公司 | Pore filling, porosity determination and pore structure analysis method and rock sample slice |
| CN114720343A (en) * | 2022-02-23 | 2022-07-08 | 东北石油大学 | Rock hole fracture network connectivity characterization device and characterization method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2616730A (en) * | 2022-02-23 | 2023-09-20 | Univ Northeast Petroleum | A rock pore-fracture network connectivity characterization device and its characterization method |
| GB2616730B (en) * | 2022-02-23 | 2024-07-17 | Univ Northeast Petroleum | A rock pore-fracture network connectivity characterization device and its characterization method |
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| GB2616730B (en) | 2024-07-17 |
| GB2616730A (en) | 2023-09-20 |
| GB202302262D0 (en) | 2023-04-05 |
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