GB2616730A - A rock pore-fracture network connectivity characterization device and its characterization method - Google Patents
A rock pore-fracture network connectivity characterization device and its characterization method Download PDFInfo
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- GB2616730A GB2616730A GB2302262.7A GB202302262A GB2616730A GB 2616730 A GB2616730 A GB 2616730A GB 202302262 A GB202302262 A GB 202302262A GB 2616730 A GB2616730 A GB 2616730A
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- 238000012512 characterization method Methods 0.000 title claims abstract description 71
- 239000011435 rock Substances 0.000 title claims abstract description 62
- 229910000634 wood's metal Inorganic materials 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 230000000903 blocking effect Effects 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 230000000007 visual effect Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 8
- 238000004626 scanning electron microscopy Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 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
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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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
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2202—Preparing specimens therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/241—Earth materials for hydrocarbon content
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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
- G01N2015/0833—Pore surface area
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- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/30—Accessories, mechanical or electrical features
- G01N2223/335—Accessories, mechanical or electrical features electronic scanning
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
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Abstract
A rock pore-fracture network connectivity characterisation device includes a pressurising vessel, a pumping vacuum assembly 6, and a pressurisation assembly 5. The pressurising vessel comprises a heating cylinder 1 provided with a heating sleeve and a blocking head 11 at each end separated by a sample chamber 12 for holding a rock sample 3, equipped with a pressure piston 2 and a Wood’s metal sample 4. The pumping vacuum assembly 5 and the pressurisation assembly 6 are connected to the two ends. The rock sample and Wood’s metal are loaded into the chamber, the device is heated and pressurised and molten Wood’s metal is injected into the rock sample pore-fracture structure. Once cooled the rock sample 3 is analysed using scanning electron microscopy to obtain a visual and quantitative characterisation of pore and fracture network within the sample in order to determine the effective space for oil and gas deposits.
Description
SPECIFICATION
A ROCK PORE-FRACTURE NETWORK CONNECTIVITY CHARACTERIZATION
DEVICE AND ITS CHARACTERIZATION METHOD
Technology Field
10001] The present invention relates to the technical field of Unconventional Oil and Gas experiments, in particular to a rock pore-fracture network connectivity characterization device and its characterization method.
Background Technology
[0002] China's shale oil resources are huge, with broad exploration space and prospects. However, whether the shale reservoir can be an effective oil producing layer depends on the effective flow of oil within the shale matrix. The matrix pore space that can be connected is only a small portion of the total pore space, no matter the complexity of pore network formed from hydraulic fracturing technologies, most of the hydrocarbons need to seep through the matrix pore network into the natural or artificial fractures to form an effective production capacity. Thus, for shale reservoirs, a quantitative characterization of pore connectivity and its genetic model will provide an effective theoretical and applied support for reservoir modification and sustainable development. Therefore, it is necessary to investigate scientific conundrums pertaining to pore distribution and connectivity in shale reservoirs, and establish the effectiveness of shale bedding fracture to shale oil capacity.
[0003] Currently, shale pore-fracture structure connectivity characterization is mostly performed by slice and scan, which procedurally involves sectioning the sample into two dimensions with their multiple images used to evaluate connectivity. However, this method has an accuracy problem, and the operation procedure is complicated and time-consuming.
Invention content [0004] In order to improve the accuracy of shale pore-fracture structure connectivity characterization, there is a need to simplify the operation process and reduce the difficulty of operation. This invention provides a rock pore-fracture network connectivity characterization device which comprises of a pressing vessel, pumping vacuum assembly, and pressurized assembly.
[0005] The pressing vessel includes a heating cylinder which comprises of a side wall provided
SPECIFICATION
with a heating sleeve, and a sample chamber placed between the two blocking heads situated at each end of the cylinder. The sample chamber is equipped with a pressurization piston, a rock sample and a characterization Wood's metal.
[0006] The pumping vacuum assembly mid the pressurization assembly are each connected to the blocking head and the sample chamber.
[0007] The assembly is used to evacuate the sample chamber which is then heated with the heating sleeve in order to melt the characterization Wood's metal.
[0008] The pressurizing assembly is used to pressurize the sample chamber, push the pressurization piston to move and press the molten characterization Wood's metal into the rock sample pore-fracture structure.
100091 The pumping vacuum assembly includes a vacuum pump connected to a vacuum vessel, mid a vacuum tube which connects two seal plugs (comprises an upper and a lower plug) and the vacuum vessel.
[0010] The vacuum vessel has an upper end which comprises of a vacuum gauge with the lower end being an emptying valve.
[0011] The pressurized assembly comprises a forcing pump which is connected to the lower sealing head via a forcing pipe set on by a pressurizing valve.
[0012] The forcing pipe is also provided with a relief valve which is located between the lower blocking head and the pressurizing tube.
[0013] The characterization Wood's metal which is in the sample chamber is located between the pressurization piston mid the rock sample (they arc located below and above the characterization Wood's metal respectively) [0014] The heating cylinder is externally connected with a temperature control instrument which is connected with the heating sleeve, and controls the sample chamber temperature.
[0015] The characterization alloy is named Wood's metal.
[0016] The present invention also provides a rock pore-fracture newvork connectivity characterization method based on the following steps: 100171 S1 Assemble samples and complete assembly of the device: open the plug of the pressing vessel, place the solid characterization Wood's metal and rock samples on the pressurization piston in the sample chamber in sequence, then install the plug and complete the
SPECIFICATION
assembly of the device.
[0018] S2 Vacuum the sample chamber: open the vacuum valve and start the vacuum pump to extract the air in the sample chamber. Close the vacuum valve and the vacuum pump when the vacuum is completed.
[0019] S3 Heating and melting the characterization Wood's metal: the heating sleeve is controlled by the temperature control instrument to raise the temperature in the sample chamber, so that the characterization Wood's metal is melted to liquid state.
[0020] S4 Pressing the liquid characterization Wood's metal into the pore-fracture structure of the rock sample: open the pressure valve and pressurize the sample chamber by using the forcing pump so that the high-pressure oil enters the sample chamber and pushes the pressurization piston upward. Once the pressure of the sample chamber reaches the target value, the pressurization piston presses the liquid characterization Wood's metal into the pore-fracture structure of the rock sample.
[0021] S5 Cooling and pressure relief sampling: after 5-60 min of holding pressure in the sample chamber, the heating sleeve is controlled by the temperature control apparatus to stop heating, so that the characterization Wood's metal in the sample chamber is cooled and solidified, with the pressure relief valve opened to release pressure after the characterization -Wood's metal is solidified, mid the blocking head opened to remove the rock sample.
[0022] S6 Visual representation: the removed rock sample is scanned to obtain the morphology of the characterization Wood's metal within the rock samples, thus visually characterizing the structural connectivity of pores and fractures within the rock sample.
[0023] The beneficial effect of the rock pore-fracture network connectivity characterization device is a rock pore-fracture network connectivity characterization method which melts the characterization Wood's metal and presses it into the pore-fracture structure of the shale sample, and obtains the characterization Wood's metal morphology of the shale sample by electron microscope scanning, so as to visualize and quantitatively characterize shale pore-fracture structure and the effective reservoir space of oil and gas. This pore-fracture structure connectivity characterization device can easily mid quickly inject the liquid characterization Wood's metal into the pore-fracture structure of the rock sample under high pressure and high temperature environment, so that the pore-fracture structure of the rock sample can be easily visualized and characterized by scanning, simplifying the process of shale pore-fracture structure connectivity characterization,
SPECIFICATION
reducing its operational difficulty, and improving the efficiency of shale pore-fracture structure connectivity characterization.
Description of figures
100241 Figure 1 is a schematic diagram of the overall structure of the rock pore-fracture network connectivity characterization device.
[0025] Figure 2 shows the first effect diagram of the pore-fracture structure of a rock sample obtained by a rock pore-fracture network connectivity characterization method of the present invention.
[0026] Figure 3 shows the pore-fracture structure of a rock sample obtained by a rock pore-fracture network connectivity characterization method of the present invention.
[0027] hi the above figures: 1 -heating cylinder, 11 -blocking head, 12 -sample chamber, 13 -temperature control instrument, 3 -rock sample, 4 -characterization ensemble 5-force pump, 51-forcing pipe, 52-relief valve, 53-pressure valve, 6-vacuum pump, 61-vacuum tube, 62 -vacuum valve. 63-vacuum gauge, 64-vent valve.
Specific implementation [0028] In order to make the technical solutions and advantages of the present invention clearer, the embodiment of the invention will be further described in combination with the drawings below as follows: [0029] Referring to Figure 1, The present invention is a rock pore-fracture network connectivity characterization device which comprises a pressurized vessel, a vacuum assembly, and a pressurized assembly.
[0030] The pressurized vessel includes a heating cylinder 1, which is a hollow circular tube made of titanium alloy. Tts inner cavity size is cp 30mm X gOmm and design pressure is 200MPa. The heating cylinder 1 is provided with a heating sleeve in the side wall (not shown in the figure), two blocking heads 11 at each end, a sample chamber 12 formed between the two blocking heads 1 which is provided with a pressurizing piston 3, the edge of which is provided with a sealing ring. The pressurizing piston 3 can be used to slide axially along the sample chamber 12. When the characterization device works, the sample chamber 12 is installed with rock sample 3, and characterization Wood's metal 4 which is located between the rock sample 3 and the pressurization piston 3. The rock sample 3 is a shale block to be characterized, the characterization Wood's metal
SPECIFICATION
4 is a wood alloy with a 40-80°C melting point, and is composed of tin, indium, bismuth, lead. The alloy is a solid at room temperature.
100311 The vacuum assembly and the pressurized assembly are each connected to the blocking head 11 and the sample chamber 12. Specifically, the two blocking heads are upper blocking head and lower blocking head, and are both axially provided with air guide holes. The vacuum assembly group includes vacutun pump 6, vacuum vessel, and a vacuum tube 61 which connects upper blocking head and vacuum vessel. The vacuum tube 61 is provided with a vacuum valve 62. The pressurized assembly comprises a forcing pump 5, a forcing pipe 51, and a pressure valve 53. The forcing pipe 51 connects the lower sealing plug and the pressurizing pump 5, the pressure valve 53 is arranged on the forcing pipe 51. In this setup, the forcing pump 5 can be a hydraulic pump and a hand crank pump. The vacuum assembly is used to evacuate the sample chamber 12. Push the pressurizing piston 2 to press the melted characterization Wood's metal 4 into the pore-fracture structure of rock sample 3. Thus, the pore-fracture structure of rock sample 3 can be easily visualized by scanning for visual characterization.
[0032] The upper end of the vacuum vessel is provided with a vacuum gauge 63, and the lower end is provided with a vent valve 64. The pressure tube 51 is provided with a pressure gauge, vacuum gauge 63. They are respectively used to display the vacuum degree and pressure in the sample chamber 12.
100331 The pressure tube 51 is also provided with a relief valve 52 located between the lower plugging head and the pressure valve 53. The relief valve 52 has two functions of active pressure relief and passive pressure relief. Active pressure relief is after the completion of high-pressure loading, to relief pressure out of the sample chamber 12. Passive pressure means that the pressure loaded by the pressure pump 5 is prevented from being too high during the pressurization process. When the pressure in the sample chamber 12 exceeds the limit pressure, the pressure relief valve 52 automatically opens to complete the pressure relief process, and its limit pressure is 30000 MPa.
[0034] The heating cylinder 1 is externally connected with a temperature controller 13, which is connected with the heating sleeve. The temperature controller 13 controls the heating temperature of the heating sleeve, so as to control the temperature in the sample chamber 12.
100351 The pore-fracture network connectivity characterization device be used to visualize the pore-fracture network connectivity in rock samples via a method which requires the characterization
SPECIFICATION
Wood's metal 4 to be melted and pressed into the pore-fracture structure in 3, which is then visualized by scanning electron microscopy. Importantly, the process of melting and pressing the characterization Wood's metal 4 into the pore-fracture structure in rock sample 4 is realized by the device. The connectivity characterization method of the invention specifically includes the following steps.
[0036] SI. Sample assembly and device assembly: open the plug head of pressing vessel 1, sequentially place solid characterization Wood's metal 4 and rock sample 3 arc placed on the pressurized piston 2 which is in sample chamber 12, then install plug head 11 and complete device assembly.
[0037] S2. Vacuum the sample chamber 12: open the vacuum valve 62 and start the vacuum pump 6 to extract the air in chamber 12. After the vacuum is completed, close the vacuum valve 62 and the vacuum pump 6.
[0038] S3. Heating and melting characterized alloy 4: The heating sleeve is controlled by temperature controller 13, and the temperature in sample chamber 12 is raised to the target temperature, so that the characterization Wood's metal 4 was inched to the liquid state. The optimal target temperature is 200°C.
[0039] S4. The liquid characterization Wood's metal is pressed into the pore-fracture structure of the rock sample: open the pressure valve and apply pressure to the sample chamber 12 through the pressure pump 5, so that the high-pressure oil enters the sample chamber 12 and pushes the pressurization piston 2 up to reach the target value; The pressurization piston 2 presses the liquid characterizing Wood's metal 4 into the pore-fracture structure of rock sample 3.
[0040] In step S4, when pressurizing sample chamber 12 by force pump 5, the hydraulic pump can be used for rapid pressure boost first. When the pressure in sample chamber 12 reaches a certain height, the hand pump can be used to pressurize the sample chamber 12 at a constant speed to the target pressure.
[0041] S5. Cooling and pressure relief sampling: After holding pressure for 5-60 min in the sample chamber 12, control the heating sleeve to stop heating by temperature controller 13, cooling and solidification of the characterized Wood's metal in the sample chamber 12, after curing of characterization Wood's metal 4 is completed, open pressure relief valve 52 to release pressure; Open plugging head 11 to take out rock sample 3.
SPECIFICATION
[0042] S6. Visual representation: The extracted rock sample 3 was scanned by scanning electron microscopy to obtain the morphology of characterization Wood's metal 4 within the rock sample, so as to visualize the pore-fracture structure in the rock sample 3 and obtain the connectivity information.
[0043] Please refer to Fig. 2 and Fig. 3, which are the effect drawings of the pore-fracture network connectivity of rock samples obtained by the connectivity characterization method.
[0044] The front, back, top, and bottom orientation words arc defined by the location of the parts and their position between each other in the figure, which is just to express the technical solution clearly and conveniently. So, the orientation word shall not limit the scope of protection claimed in this application.
100451 The above embodiments and the features in the embodiments mentioned in this paper may be combined without conflict.
[0046] The foregoing is only a better embodiment of the invention and is not intended to limit the it. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the invention shall be included within the scope of protection of the invention.
Claims (9)
- CLAIMS1. The pressurizing vessel includes a heating cylinder which respectively comprises of a side wall provided with a heating sleeve, and two ends provided with a blocking hcad. The ends arc separated with a sample chamber which contains a pressurization piston, a rock sample, and a characterization Wood's metal.The pumping vacuum assembly and the pressurized assembly are each connected to the blocking head and a sample chamber which is evacuated with the former and pressurized with the latter. The heating sleeve is used to heat the sample chamber to melt the characterization Wood's metal which is then pushed and moved via the pressurization piston within the pressurized assembly into the rock sample pore-fracture structure.
- 2. A rock pore-fracture network connectivity characterization device according to claim 1, comprises: two seals plugs (upper plug and lower plug), a pumping vacuum assembly which includes a vacuum pump, a vacuum vessel and a vacuum tube. In addition, the vacuum pump is connected with the vacuum vessel which is connected to the upper blocking head via the vacuum tube provided with a vacuum valve.
- 3. A rock pore-fracture network connectivity characterization device according to claim 2 comprises: a vacuum vessel provided with a vacutun gauge at the upper end and an emptying valve at the lower end.
- 4. A rock pore-fracture network connectivity characterization device according to claim 3, comprises: the pressurized assembly which includes a forcing pump, a forcing pipe and a pressurizing valve. The forcing pipe connects the lower sealing head and the forcing pump.
- 5. A rock pore-fracture network connectivity characterization device according to claim 4, comprises the forcing pipe provided with a relief valve which is located between the lower blocking head and the pressurizing tube.
- 6. A rock pore-fracture network connectivity characterization device according to claim 5 comprises: A sample characterizing alloy in the chamber located between the pressurization piston and the rock sample. The former is situated beneath and the latter above the alloy 7. A rock pore-fracture network connectivity characterization device according to claim 6 comprises: a heating cylinder externally connected with a temperature control instrument that is used to control the heating temperature of the heating sleeve in order to control temperature within the sample chamber.
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- 8. A rock pore-fracture network connectivity characterization device according to claim 7 comprises: a characterization alloy which is Wood's metal.
- 9. A rock pore-fracture network connectivity characterization method undertaken via the device according to claims 7-8 above, includes the following steps: SI. Assemble samples and complete assembly of the device: open the plug of the pressing vessel, place the solid characterization Wood's metal and rock samples on the pressurization piston in the sample chamber in sequence, then install the plug and complete the assembly of the device.S2. Vacuum the sample chamber: open the vacuum valve and start the vacuum pump to extract the air in the sample chamber. Close the vacuum valve and the vacuum pump after the vacuum is completed.S3. Heating and melting the characterization Wood's metal: the heating sleeve is controlled by the temperature control instrument to raise the temperature in the sample chamber, so that the characterized Wood's metal is melted to liquid state.S4. The liquid characterization Wood's metal is pressed into the pore-fracture structure of the rock sample: open the pressure valve and apply pressure to the sample chamber through the pressure pump, so that the high-pressure oil enters the sample chamber and pushes the pressurization piston upward, so that the pressure of the sample chamber reaches the target value; The pressurization piston presses the liquid characterization Wood's metal into the pore-fracture structure of the rock sample.S5. Cooling and pressure relief sampling: after 5-60 min of pressure preservation in the sample chamber, the temperature controller is used to restrict heat release by the heating sleeve, which makes the Wood's metal solidify then open the pressure relief valve to release the pressure and open the plug to take out the rock sample.S6. Visual representation: The rock samples were scanned to obtain the morphology of the characterization Wood's metal, so as to visualize the connectivity of the pore-fracture structure network within the rock samples.
Applications Claiming Priority (1)
| 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 |
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| Publication Number | Publication Date |
|---|---|
| GB202302262D0 GB202302262D0 (en) | 2023-04-05 |
| GB2616730A true GB2616730A (en) | 2023-09-20 |
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| 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 |
|---|---|---|---|---|
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| ZHAO, J. et al; "Pore connectivity characterization of shale using integrated wood's metal impregnation, microscopy, tomography, tracer mapping and porosimetry", Fuel, 259, 2020, 116248 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114720343A (en) | 2022-07-08 |
| GB202302262D0 (en) | 2023-04-05 |
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