LU503715B1 - Triaxial test device for natural gas hydrate-containing sediment - Google Patents

Triaxial test device for natural gas hydrate-containing sediment Download PDF

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Publication number
LU503715B1
LU503715B1 LU503715A LU503715A LU503715B1 LU 503715 B1 LU503715 B1 LU 503715B1 LU 503715 A LU503715 A LU 503715A LU 503715 A LU503715 A LU 503715A LU 503715 B1 LU503715 B1 LU 503715B1
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LU
Luxembourg
Prior art keywords
natural gas
pressure
gas hydrate
closed
testing machine
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Application number
LU503715A
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German (de)
Inventor
Jialu Wu
Qiannan Yu
Dianjie Sui
Yang Yu
Kun Zhang
Mingwang Zhan
Huawei Zhang
Baoyan Wang
Fulei Zhao
Xingang Wang
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Univ Guangdong Petrochem Tech
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Priority to LU503715A priority Critical patent/LU503715B1/en
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Publication of LU503715B1 publication Critical patent/LU503715B1/en

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12—Pressure testing
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/025—Geometry of the test
    • G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Remote Sensing (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention discloses a triaxial test device for a natural gas hydrate-containing sediment, and belongs to the technical field of testing the natural gas hydrate-containing sediment. The device comprises: a triaxial testing machine having a plurality of pipeline interfaces that are in communication with a closed environment and may be closed; a temperature control unit connected with the pipeline interfaces of the triaxial testing machine; a pressure control unit comprising a confining pressure control group and a pore pressure control group which are connected with the pipeline interfaces of the triaxial testing machine; and a data acquisition unit electrically connected with a temperature sensor, a pressure sensor and a force measuring sensor for monitoring a force applied by the triaxial testing machine to a natural gas hydrate-containing sediment specimen which are arranged in the closed environment. The present invention can simulate the processes of synthesizing the natural gas hydrate in the natural gas hydrate-containing sediment under natural conditions and decomposing the natural gas hydrate under exploitation condition, and achieves high-precision temperature and pressure control and precise measurement of the strength and the volume change of the natural gas hydrate-containing sediment.

Description

BL-5646
TRIAXIAL TEST DEVICE FOR NATURAL GAS FROST
HYDRATE-CONTAINING SEDIMENT
TECHNICAL FIELD
The present invention belongs to the technical field of testing the natural gas hydrate-containing sediment, and in particular relates to a triaxial test device for a natural gas hydrate-containing sediment.
BACKGROUND
At present, some progress has been made in the related research on the mechanical property of a natural gas hydrate-containing sediment, and different triaxial testing machines have been developed by laboratories at home and abroad to test and analyze the basic physical properties of natural gas hydrates. However, among the test devices that have been reported currently, some devices cannot simulate the actual situation of the natural gas hydrate generation under natural conditions, resulting in low reliability of the test results; some devices cannot simulate the influence of the hydrate decomposition process on the strength of the natural gas hydrate-containing sediment under exploitation condition, so that the mechanical property of the natural gas hydrate-containing sediment cannot be accurately reflected; and some devices have limited temperature and pressure control precision and cannot meet the test requirements.
SUMMARY
In order to solve the above problems, the present invention adopts the following technical schemes.
A triaxial test device for a natural gas hydrate-containing sediment comprises: a triaxial testing machine, wherein the triaxial testing machine is configured to provide a closed environment and perform mechanical property testing on a natural gas hydrate-containing sediment specimen in the closed environment; and the triaxial testing machine has a plurality of pipeline interfaces that are in 1
BL-5646
LU503715 communication with the closed environment and may be closed; a temperature control unit, wherein the temperature control unit is connected with the pipeline interfaces of the triaxial testing machine, and is configured to control a temperature in the closed environment and a temperature of the natural gas hydrate-containing sediment specimen to achieve a temperature environment for simulating the decomposition process of the natural gas hydrate; a pressure control unit, wherein the pressure control unit comprises a confining pressure control group and a pore pressure control group connected with the pipeline interfaces of the triaxial testing machine, the confining pressure control group is configured to control a pressure in the closed environment, and the pore pressure control group is configured to provide distilled water and methane gas required by natural gas hydrate synthesis in the closed environment and maintain a pressure of natural gas hydrate generation and decomposition process in the closed environment; and a data acquisition unit, wherein the data acquisition unit is electrically connected with a temperature sensor, a pressure sensor and a force measuring sensor for monitoring a force applied by the triaxial testing machine to the natural gas hydrate-containing sediment specimen which are arranged in the closed environment, so as to achieve real-time acquisition and recording of the temperature and the pressure in the closed environment and the force applied by the triaxial testing machine to the natural gas hydrate-containing sediment specimen.
Further, the triaxial testing machine comprises a testing machine frame, a base, a pressure chamber forming the closed environment, a driving mechanism and a loading assembly, wherein the base is arranged at a bottom end of the testing machine frame and is positioned in the testing machine frame; the pressure chamber is positioned in the testing machine frame, the pressure chamber 2
BL-5646
LU503715 comprises a closed pressure chamber and a high pressure chamber, the closed pressure chamber comprises a closed pressure cylinder and a cylinder cover, one end of the closed pressure cylinder is in sealing connection with the base, the other end of the closed pressure cylinder 1s fixedly connected with the cylinder cover, the driving mechanism is fixedly connected onto the testing machine frame, the driving mechanism drives the cylinder cover to rise or fall, and the cylinder cover drives the closed pressure cylinder to slide along a supporting rod; the supporting rod is of a hollow structure, one end of the supporting rod is fixedly connected with an upper end of the testing machine frame, the other end of the supporting rod is provided with a bent part, and the bent part is arranged in the closed pressure cylinder and is in sliding and sealing connection with an inner wall of the closed pressure cylinder; the high pressure chamber comprises a high pressure cylinder, the high pressure cylinder 1s arranged in the closed pressure cylinder, an upper end and a lower end of the high pressure cylinder are respectively provided with an upper pressure column and a lower pressure column and form a closed space with an inner cavity of the high pressure cylinder, and the lower pressure column 1s fixedly connected with the base; the natural gas hydrate-containing sediment specimen is placed between the upper pressure column and the lower pressure column; and the loading assembly is arranged at the upper end of the testing machine frame, wherein a loading end of the loading assembly passes through a middle hole of the supporting rod and extends into the closed pressure cylinder to be matched with the upper pressure column, so as to load the natural gas hydrate-containing sediment specimen.
Beneficial Effects:
The present invention has a reasonable design and convenient operation, can simulate the processes of synthesizing the natural gas hydrate in the natural gas hydrate-containing sediment under natural conditions and decomposing the natural 3
BL-5646
LU503715 gas hydrate under exploitation condition, achieves high-precision temperature and pressure control and precise measurement of the strength and the volume change of the natural gas hydrate-containing sediment, provides basic data for deformation analysis and development scheme design of the natural gas hydrate-containing sediment reservoir, and provides basic data support and guidance for exploration and safe exploitation of natural gas hydrate resources.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of an overall connection according to the present invention; and
FIG. 2 is a schematic diagram of the structure of a triaxial testing machine.
In the drawings, 10. air supply assembly; 11. first methane gas cylinder; 12. sixth needle valve; 13. third plunger pump; 14. second pressure gauge; 15. second flow meter; 16. seventh needle valve; 20. confining pressure control group; 21. second thermostat; 22. second rotor pump; 23. fourth needle valve; 24. second plunger pump; 25. fifth needle valve; 30. exhaust assembly; 31. second methane gas cylinder; 32. ninth needle valve; 33. fourth plunger pump; 34. third pressure gauge; 35. third flow meter; 36. eighth needle valve; 40. temperature control unit; 41. first thermostat; 42. first rotor pump; 43. first needle valve; 44. first plunger pump; 45. third needle valve; 46. second needle valve; 47. first flow meter; 48. first pressure gauge; 50. industrial personal computer; 60. pipeline interface; 61. first pipeline interface; 62. second pipeline interface; 63. third pipeline interface; 64. fourth pipeline interface; 70. upright column; 80. temperature sensor; 90. quick connector; 100. natural gas hydrate-containing sediment specimen; 110. second seepage plate; 120. lower pressure column; 130. lower beam; 140. piston; 150. supporting rod; 160. upper beam; 170. speed reducer; 180. screw rod; 190. cylinder cover; 200. closed pressure cylinder; 210. force measuring sensor; 220. upper pressure column; 230. first seepage plate; and 240. high pressure cylinder. 4
BL-5646
LU503715
DETAILED DESCRIPTION OF THE EMBODIMENTS
Example 1
A triaxial test device for a natural gas hydrate-containing sediment comprises: a triaxial testing machine, wherein the triaxial testing machine is configured to provide a closed environment and perform mechanical property testing on a natural gas hydrate-containing sediment specimen 100 in the closed environment; and the triaxial testing machine has a plurality of pipeline interfaces 60 that are in communication with the closed environment and may be closed; a temperature control unit 40, wherein the temperature control unit 40 is connected with the pipeline interfaces of the triaxial testing machine, and is configured to control a temperature in the closed environment and a temperature of the natural gas hydrate-containing sediment specimen 100 to achieve a temperature environment for simulating the decomposition process of the natural gas hydrate; a pressure control unit, wherein the pressure control unit comprises a confining pressure control group 20 and a pore pressure control group connected with the pipeline interfaces of the triaxial testing machine, the confining pressure control group 20 is configured to control a pressure in the closed environment, and the pore pressure control group is configured to provide distilled water and methane gas required by natural gas hydrate synthesis in the closed environment and maintain a pressure of natural gas hydrate generation and decomposition process in the closed environment; and a data acquisition unit, wherein the data acquisition unit is electrically connected with a temperature sensor 80, a pressure sensor and a force measuring sensor 210 for monitoring a force applied by the triaxial testing machine to the natural gas hydrate-containing sediment specimen 100 which are arranged in the closed environment, so as to achieve real-time acquisition and recording of the temperature and the pressure in the closed environment and the force applied by
BL-5646
LU503715 the triaxial testing machine to the natural gas hydrate-containing sediment specimen 100.
The triaxial testing machine comprises a testing machine frame, a base (not shown), a pressure chamber forming the closed environment, a driving mechanism and a loading assembly, wherein the base 1s arranged at a bottom end of the testing machine frame and is positioned in the testing machine frame; the pressure chamber is positioned in the testing machine frame, the pressure chamber comprises a closed pressure chamber and a high pressure chamber, the closed pressure chamber comprises a closed pressure cylinder 200 and a cylinder cover 190, one end of the closed pressure cylinder 200 is in sealing connection with the base, the other end of the closed pressure cylinder is fixedly connected with the cylinder cover 190, the driving mechanism is fixedly connected onto the testing machine frame, the driving mechanism drives the cylinder cover to 190 rise or fall, and the cylinder cover 190 drives the closed pressure cylinder 200 to slide along a supporting rod 150; the supporting rod 150 is of a hollow structure, one end of the supporting rod is fixedly connected with an upper end of the testing machine frame, the other end of the supporting rod 1s provided with a bent part, and the bent part is arranged in the closed pressure cylinder 200 and is in sliding and sealing connection with an inner wall of the closed pressure cylinder 200; the high pressure chamber comprises a high pressure cylinder 240, the high pressure cylinder 240 is arranged in the closed pressure cylinder 200, an upper end and a lower end of the high pressure cylinder 240 are respectively provided with an upper pressure column 220 and a lower pressure column 120 and form a closed space with an inner cavity of the high pressure cylinder 240, and the lower pressure column 120 is fixedly connected with the base; the natural gas hydrate-containing sediment specimen 100 is placed between the upper pressure column 220 and the lower pressure column 120; and the loading assembly is arranged at the upper end 6
BL-5646
LU503715 of the testing machine frame, wherein a loading end of the loading assembly passes through a middle hole 150 of the supporting rod and extends into the closed pressure cylinder 200 to be matched with the upper pressure column 220, so as to load the natural gas hydrate-containing sediment specimen 100.
In this example, the loading assembly is one of a hydraulic cylinder, an air cylinder, or an electric cylinder, and the loading end is the piston 140.
A first seepage plate 230 is arranged between the upper pressure column 220 and the natural gas hydrate-containing sediment specimen 100, a second seepage plate 110 is arranged between the lower pressure column 120 and the natural gas hydrate-containing sediment specimen, and a plurality of pipeline interfaces that are in communication with an inner cavity of the high pressure cylinder 240 are arranged on the first seepage plate 230 and the second seepage plate 110; and a rubber film is wrapped around an outer side of the natural gas hydrate-containing sediment specimen 100 positioned between the first seepage plate 230 and the second seepage plate 110.
In this example, the testing machine frame is composed of an upper beam 160, upright columns 70 and a lower beam 130. The upper beam 160 and the lower beam 130 are connected with the upright columns 70 with bolts.
A sealing ring is arranged in a gap between the closed pressure cylinder 200 and the supporting rod 150, and a lower end of the closed pressure cylinder 200 is sealed with the base with the sealing ring.
A sealing ring is arranged in a gap between the base and the lower beam 130.
The driving mechanism comprises a driving device, a fixed end of the driving device is fixedly connected with the upper end of the testing machine frame, a driving end of the driving device is fixedly connected with a screw rod 180, and a cylinder cover 190 is provided with threads; and the screw rod 180 is engaged with 7
BL-5646
LU503715 the threads to drive the cylinder cover 190 to rise or fall relative to the supporting rod 150.
In this example, the driving device is a speed reducer 170, and an output shaft of the speed reducer 170 1s fixedly connected with the screw rod 180.
The temperature control unit 40 comprises a first thermostat 41, an annular cavity formed between the closed pressure cylinder 200 and the high pressure cylinder 240 is in communication with the first thermostat 41 through a first pipeline, and a first rotor pump 42, a first needle valve 43, a first plunger pump 44, a second needle valve 46, a first flow meter 47 and a first pressure meter 48 are sequentially arranged on the first pipeline, wherein the first rotor pump 42 is arranged at one side close to the first thermostat 41; a bypass pipeline is arranged between the first rotor pump 42 and the second needle valve 46, a third needle valve 45 is arranged on the bypass pipeline, and two joints of the bypass pipeline are arranged outside an inlet end of the first needle valve 43 and outside an outlet end of the first plunger pump 44, respectively.
A temperature sensor 80 is arranged at the bent part of the supporting rod 150 that is positioned at one side of the closed pressure cylinder 200, and is configured to detect a temperature of a cooling liquid between the closed pressure cylinder 200 and the high pressure cylinder 240.
The confining pressure control group 20 comprises a second thermostat 21, the second thermostat 21 is in communication with the pipeline interfaces positioned on the second seepage plate 110 through a second pipeline, and a second rotor pump 22, a fourth needle valve 23, a second plunger pump 24 and a fifth needle valve 25 are sequentially arranged on the second pipeline, wherein the second rotor pump 22 is arranged on one side close to the second thermostat 21.
The pore pressure control group comprises an air supply assembly 10 and an exhaust assembly 30, wherein the air supply assembly 10 comprises a first 8
BL-5646
LU503715 methane gas cylinder 11, the first methane gas cylinder 11 is in communication with the pipeline interfaces positioned on a second seepage plate 110 through an air inlet branch, and a sixth needle valve 12, a third plunger pump 13, a second pressure gauge 14, a second flow gauge 15 and a seventh needle valve 16 are sequentially arranged on the air inlet branch; and the exhaust assembly 30 comprises a second methane gas cylinder 31, the second methane gas cylinder 31 1s in communication with the pipeline interfaces positioned on the first seepage plate 230 through an exhaust branch, and an eighth needle valve 36, a third flow meter 35, a third pressure meter 34, a fourth plunger pump 33 and a ninth needle valve 32 are sequentially arranged on the exhaust branch.
In this example, an upper part of the upper pressure column 220 is provided with an annular groove for fixing during mounting. A lower part of the upper pressure column 220 1s provided with a cylindrical bulge, and the bulge has a diameter that is the same as that of the natural gas hydrate-containing sediment specimen 100.
A sealing ring is arranged between or at the joint of the upper pressure column 220 and the first seepage plate 230.
The first seepage plate 230 1s provided with a first pipeline interface 61 and a third pipeline interface 63, and the first pipeline interface 61 and the third pipeline interface 63 are in communication with the closed pressure cylinder 200, wherein the third pipeline interface 63 is a methane gas outlet and is connected with the exhaust assembly 30; and the first pipeline interface 61 is water inlet and outlet and 1s connected with the confining pressure control group 20.
An upper part of the lower pressure column 120 is provided with a cylindrical bulge, the lower pressure column 120 has a diameter that is the same as that of the natural gas hydrate-containing sediment specimen 100, a sealing ring is arranged 9
BL-5646 between or at the joint of the lower pressure column 120 and the second seepage "9 plate 110, the second seepage plate 110 1s provided with a second pipeline interface 62, the second pipeline interface 62 is in communication with the closed pressure cylinder 200, and the second pipeline interface 62 is a methane gas inlet and 1s connected with the air supply assembly 10.
The high pressure cylinder 240, the base, the supporting rod 150 and the closed pressure cylinder 200 form a closed space, a fourth pipeline interface 64 is arranged in the closed space, and the fourth pipeline interface 64 is cooling liquid outlet and inlet and is connected with the temperature control unit 40.
The data acquisition unit 1s an industrial personal computer 50, and the industrial personal computer 50 is electrically connected with the force measuring sensor 210, the temperature sensor 80, the first pressure gauge 48, the second pressure gauge 14 and the third pressure gauge 34.
The above description is only preferred example of the present invention, and 1s not intended to limit the technical scope of the present invention. As such, any minor amendments, equivalent changes and modifications made to the above examples according to the technical spirit of the present invention shall fall within the scope of the technical scheme of the present invention.

Claims (2)

  1. BL-5646 LU503715 CLAIMS:
    I. A triaxial test device for a natural gas hydrate-containing sediment, comprising: a triaxial testing machine, wherein the triaxial testing machine is configured to provide a closed environment and perform mechanical property testing on a natural gas hydrate-containing sediment specimen in the closed environment; and the triaxial testing machine has a plurality of pipeline interfaces that are in communication with the closed environment and may be closed; a temperature control unit, wherein the temperature control unit is connected with the pipeline interfaces of the triaxial testing machine, and is configured to control a temperature in the closed environment and a temperature of the natural gas hydrate-containing sediment specimen to achieve a temperature environment for simulating the decomposition process of the natural gas hydrate; a pressure control unit, wherein the pressure control unit comprises a confining pressure control group and a pore pressure control group connected with the pipeline interfaces of the triaxial testing machine, the confining pressure control group is configured to control a pressure in the closed environment, and the pore pressure control group is configured to provide distilled water and methane gas required by natural gas hydrate synthesis in the closed environment and maintain a pressure of natural gas hydrate generation and decomposition process in the closed environment; and a data acquisition unit, wherein the data acquisition unit is electrically connected with a temperature sensor, a pressure sensor and a force measuring sensor for monitoring a force applied by the triaxial testing machine to the natural gas hydrate-containing sediment specimen which are arranged in the closed environment, so as to achieve real-time acquisition and recording of the temperature and the pressure in the closed environment and the force applied by 11
    BL-5646 LU503715 the triaxial testing machine to the natural gas hydrate-containing sediment specimen.
  2. 2. The triaxial test device for the natural gas hydrate-containing sediment according to claim 1, wherein the triaxial testing machine comprises a testing machine frame, a base, a pressure chamber forming the closed environment, a driving mechanism and a loading assembly, wherein the base is arranged at a bottom end of the testing machine frame and is positioned in the testing machine frame; the pressure chamber is positioned in the testing machine frame, the pressure chamber comprises a closed pressure chamber and a high pressure chamber, the closed pressure chamber comprises a closed pressure cylinder and a cylinder cover, one end of the closed pressure cylinder is in sealing connection with the base, the other end of the closed pressure cylinder is fixedly connected with the cylinder cover, the driving mechanism is fixedly connected onto the testing machine frame, the driving mechanism drives the cylinder cover to rise or fall, and the cylinder cover drives the closed pressure cylinder to slide along a supporting rod; the supporting rod is of a hollow structure, one end of the supporting rod is fixedly connected with an upper end of the testing machine frame, the other end of the supporting rod is provided with a bent part, and the bent part is arranged in the closed pressure cylinder and is in sliding and sealing connection with an inner wall of the closed pressure cylinder; the high pressure chamber comprises a high pressure cylinder, the high pressure cylinder is arranged in the closed pressure cylinder, an upper end and a lower end of the high pressure cylinder are respectively provided with an upper pressure column and a lower pressure column and form a closed space with an inner cavity of the high pressure cylinder, and the lower pressure column is fixedly connected with the base; the natural gas hydrate-containing sediment specimen is placed between the upper pressure column and the lower pressure column; and the loading assembly is 12
    BL-5646 LU503715 arranged at the upper end of the testing machine frame, wherein a loading end of the loading assembly passes through a middle hole of the supporting rod and extends into the closed pressure cylinder to be matched with the upper pressure column, so as to load the natural gas hydrate-containing sediment specimen. 13
LU503715A 2023-03-23 2023-03-23 Triaxial test device for natural gas hydrate-containing sediment LU503715B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
LU503715A LU503715B1 (en) 2023-03-23 2023-03-23 Triaxial test device for natural gas hydrate-containing sediment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU503715A LU503715B1 (en) 2023-03-23 2023-03-23 Triaxial test device for natural gas hydrate-containing sediment

Publications (1)

Publication Number Publication Date
LU503715B1 true LU503715B1 (en) 2023-09-25

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ID=88144797

Family Applications (1)

Application Number Title Priority Date Filing Date
LU503715A LU503715B1 (en) 2023-03-23 2023-03-23 Triaxial test device for natural gas hydrate-containing sediment

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LU (1) LU503715B1 (en)

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Effective date: 20230925