CN114002073A - Hydrate mechanical property test device and method considering deposition angle - Google Patents

Hydrate mechanical property test device and method considering deposition angle Download PDF

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Publication number
CN114002073A
CN114002073A CN202111269922.9A CN202111269922A CN114002073A CN 114002073 A CN114002073 A CN 114002073A CN 202111269922 A CN202111269922 A CN 202111269922A CN 114002073 A CN114002073 A CN 114002073A
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test
assembly
sample
pressure chamber
main body
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Chinese (zh)
Inventor
公彬
张瑞琪
蒋宇静
李彦龙
纳赛尔·戈尔萨纳米
毕延续
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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Priority to CN202111269922.9A priority Critical patent/CN114002073A/en
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    • 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
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • 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
    • G01N1/36—Embedding or analogous mounting of samples
    • 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
    • G01N1/38—Diluting, dispersing or mixing samples
    • 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
    • G01N3/02—Details
    • 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
    • G01N1/36—Embedding or analogous mounting of samples
    • G01N2001/366—Moulds; Demoulding
    • 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
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • 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
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • 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
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means
    • 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
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • 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
    • G01N2203/022—Environment of the test
    • G01N2203/0244—Tests performed "in situ" or after "in situ" use
    • G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
    • 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
    • G01N2203/0258—Non axial, i.e. the forces not being applied along an axis of symmetry of the specimen
    • 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
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens
    • 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • 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
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

Abstract

The invention discloses a hydrate mechanical property test device considering a deposition angle, which comprises a test bed, wherein a sample preparation part and a test part are arranged on the test bed; the sample preparation part comprises a frame, and the frame is detachably connected with the top surface of the test bed; the top surface of the frame is fixedly connected with a sample preparation assembly, the bottom end of the sample preparation assembly is provided with an oblique angle, and the sample preparation assembly is electrically connected with the test part; a mould for manufacturing a sample is arranged below the sample preparation assembly; the test part comprises a test main body and a data collection assembly, wherein the test main body is used for mounting a sample, two ends of the test main body are respectively communicated with a fluid supply assembly and a fluid recovery assembly, and the fluid supply assembly and the fluid recovery assembly are respectively electrically connected with the data collection assembly; the sample preparation assembly is electrically connected with the data collection assembly. The device has the advantages of simple structure and strong applicability, can conveniently simulate the mechanical characteristics of natural gas hydrate sedimentary layers at different angles, is convenient for test and research, greatly shortens the test process and simplifies the test process.

Description

Hydrate mechanical property test device and method considering deposition angle
Technical Field
The invention relates to the technical field of energy exploitation, in particular to a hydrate mechanical property testing device and a testing method considering a deposition angle.
Background
The natural gas hydrate (combustible ice) is an ice-like crystalline substance formed by natural gas and water under high-pressure and low-temperature conditions, is widely distributed in deep sea or land permafrost, generates only a small amount of carbon dioxide and water after combustion, has far less pollution than coal, petroleum and the like, and has huge reserves, so the natural gas hydrate (combustible ice) is internationally accepted as a substitute energy source for the petroleum and the like.
According to the drilling data, the heterogeneous deposition exists among all the zones of the natural gas hydrate sedimentary deposit in the geological deposition process, so that various angles exist among the natural gas hydrate reservoirs, and the natural gas is recovered from the natural gas hydrate sedimentary deposit, so that the strength of the sedimentary deposit of the stratum is reduced, the instability of the stratum is increased, and disasters such as geological collapse, landslide of the ground bottom and the like are caused. How to economically, efficiently and safely mine natural gas hydrates in sedimentary formations at different angles, and meanwhile, geological disasters such as landslide and sedimentary formation collapse cannot be caused, and the mechanical characteristics of hydrate sediments need to be deeply researched.
Disclosure of Invention
The invention aims to provide a hydrate mechanical property testing device considering a deposition angle so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a hydrate mechanical property test device considering a deposition angle, which comprises a test bed, wherein a sample preparation part and a test part are arranged on the test bed;
the sample preparation part comprises a frame, and the frame is detachably connected with the top surface of the test bed; the sample preparation assembly is fixedly connected to the top surface of the frame, an oblique angle is arranged at the bottom end of the sample preparation assembly, and the sample preparation assembly is electrically connected with the test part; a mould for manufacturing a sample is arranged below the sample preparation assembly;
the test part comprises a test main body and a data collection assembly, wherein the test main body is used for mounting the sample, two ends of the test main body are respectively communicated with a fluid supply assembly and a fluid recovery assembly, and the fluid supply assembly and the fluid recovery assembly are respectively electrically connected with the data collection assembly; the sample preparation assembly is electrically connected with the data collection assembly.
Preferably, the sample preparation assembly comprises a hydraulic oil cylinder fixedly connected with the top end of the frame, the output end of the hydraulic oil cylinder is fixedly connected with a pressure head, and the bottom end of the pressure head is provided with the bevel angle; and a third sensor is fixedly connected to the hydraulic oil cylinder and electrically connected with the data collection assembly.
Preferably, the mold comprises a sample cylinder fixedly connected with the bottom surface of the frame, and an inner cavity of the sample cylinder is matched with the pressure head; the bottom end of the inner cavity of the sample cylinder is fixedly connected with a bottom wall, and the bottom wall is detachably connected with the bottom end of the frame.
Preferably, the test main body comprises a main body frame, and the bottom end of the main body frame is fixedly connected with the top surface of the test bed; an inner pressure surrounding chamber is arranged on the bottom surface of the inner cavity of the main body frame, and the inner cavity of the inner pressure surrounding chamber is used for mounting the test sample; the outer wall of the inner confining pressure chamber is wound with a heat exchanger; a confining pressure chamber which is coaxial with the inner confining pressure chamber is arranged outside the inner confining pressure chamber, and the confining pressure chamber is connected with the side wall of the main body frame in a sliding mode; the top surface of the main body frame is fixedly connected with a pressure applying assembly, the pressure applying assembly is fixedly connected with the confining pressure chamber, and the pressure applying assembly is electrically connected with the data collecting assembly; the inner plenum is in communication with the fluid recovery assembly; the plenum is in communication with the fluid supply assembly.
Preferably, an adjusting block is fixedly connected to the bottom end of the confining pressure chamber, and the adjusting block abuts against the inner confining pressure chamber; the aligning block is provided with a built-in load sensor which is electrically connected with the data collecting assembly.
Preferably, the lower end of the inner pressure chamber is fixedly connected with the main body frame through a support plate, and the fluid recovery assembly penetrates through the support plate and then is communicated with the inner cavity of the inner pressure chamber; the top wall of the inner pressure surrounding chamber is in sliding connection with an inner cavity of the inner pressure surrounding chamber, and the centering block is abutted to the top wall; the fluid supply assembly penetrates through the centering block and the top wall and is communicated with an inner cavity of the inner confining pressure chamber; the inner cavity of the inner confining pressure chamber is used for installing the test sample, the test sample is divided into a first test block and a second test block, and the first test block is matched with the second test block.
A hydrate mechanical property test method considering a deposition angle comprises the following test steps:
s1, preparing the sample; selecting a proper bevel angle to press the sample, and recording the data of the sample;
s2, installing the sample to be measured; mounting the sample into the inner cavity of the inner plenum, connecting the fluid supply assembly and the fluid recovery assembly, and connecting the data collection assembly;
s3, carrying out a test; carrying out the test according to the set test target;
s4, collecting test data, and collecting the test data through the data collection component;
and S5, processing the test data, analyzing and processing the data collected by the data collection component, and summarizing rules.
Preferably, in the step S1, when the sample is prepared, the aggregate is filled from the bottom wall position; the temperature at which the sample is prepared is not higher than 0 ℃.
Preferably, in step S1, the first test block includes only two manufacturing methods, and the second test block includes three manufacturing methods.
Preferably, in step S2, the center hole of the aligning block is opposite to the center hole of the top wall.
The invention discloses the following technical effects: according to the invention, the sample with different oblique angles is manufactured through the oblique angle matching die of the sample preparation assembly, so that the uneven deposition between the natural gas hydrate storage layers is simulated, the similarity with the actual stratum is higher, and the test result is more accurate; the oblique angle of the sample preparation assembly is convenient to replace, the angle of the oblique angle is convenient to adjust, deposition layers with different oblique angles are simulated, and the use is convenient; the test body is combined with the sample preparation assembly, so that second test blocks in different forming processes can be manufactured according to actual stratum conditions, the test result is more accurate, the test is more economical and efficient, and theoretical support is provided for safely exploiting natural gas hydrates in sedimentary layers at different angles; the method can accurately measure the mechanical properties of the hydrates in different sedimentary layers, discuss the occurrence mechanisms of geological disasters such as landslide and sedimentary layer collapse in the natural gas hydrate exploitation process, provide theoretical support and research direction for safely and efficiently exploiting the natural gas hydrate, avoid the occurrence of the geological disasters and accelerate the exploitation and utilization of the natural gas hydrate. The device has the advantages of simple structure and strong applicability, can conveniently simulate the mechanical characteristics of the natural gas hydrate sedimentary deposit at different angles, is convenient for test and research, greatly shortens the test process, simplifies the test process, and provides theoretical support for the safe and efficient exploitation of the natural gas hydrate sedimentary deposit at different angles.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creating any labor.
FIG. 1 is a schematic structural diagram of a hydrate mechanical property testing device considering a deposition angle according to the invention;
FIG. 2 is a three-dimensional view of a sample preparation section according to the present invention;
FIG. 3 is a schematic view of a sample preparation section according to the present invention;
FIG. 4 is a schematic view of the structure of the test section of the present invention;
FIG. 5 is a schematic structural view of a test body according to the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 3;
FIG. 7 is a partial enlarged view of B in FIG. 5;
FIG. 8 is a schematic view of the structure of the inner plenum of the present invention;
wherein, 1, a frame; 2. a hydraulic cylinder; 3. a reinforcing plate; 4. a pressure head; 5. a sample cartridge; 6. a bottom wall; 7. a sample; 8. a test subject; 9. a magnetostrictive displacement sensor; 10. a pressure applying oil cylinder; 11. an oil cylinder accessory; 12. a main body frame; 13. a confining pressure chamber; 14. a linear slider; 15. an inner confining pressure chamber; 16. hoisting the oil cylinder; 17. a centering block; 18. a built-in load sensor; 19. a support plate; 20. a fluid supply tank; 21. a first conduit; 22. a fluid recovery tank; 23. A second conduit; 24. a first sensor; 25. a second sensor; 26. a third sensor; 27. A data collection module; 28. a data processing module; 29. a test bed; 30. a heat exchanger; 31. A top wall; 701. a first test block; 702. and (5) a second test block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 8, the invention provides a hydrate mechanical property test device considering a deposition angle, which comprises a test bed 29, wherein a sample preparation part and a test part are arranged on the test bed 29;
the sample preparation part comprises a frame 1, and the frame 1 is detachably connected with the top surface of the test bed 29; the top surface of the frame 1 is fixedly connected with a right sample preparation assembly, the bottom end of the sample preparation assembly is provided with an oblique angle, and the sample preparation assembly is electrically connected with the test part; a mould for manufacturing the sample 7 is arranged below the sample preparation assembly;
the test part comprises a test main body 8 for mounting the test sample 7 and a data collection assembly, two ends of the test main body 8 are respectively communicated with a fluid supply assembly and a fluid recovery assembly, and the fluid supply assembly and the fluid recovery assembly are respectively electrically connected with the data collection assembly; the sample preparation assembly is electrically connected with the data collection assembly.
According to the invention, the sample 7 with different oblique angles is manufactured through the oblique angle matching die of the sample preparation assembly, so that the uneven deposition between the natural gas hydrate storage layers is simulated, the similarity with the actual stratum is higher, and the test result is more accurate; the oblique angle of the sample preparation assembly is convenient to replace, the angle of the oblique angle is convenient to adjust, deposition layers with different oblique angles are simulated, and the use is convenient; the test main body 8 of the invention can be combined with the sample preparation assembly to prepare the second test blocks 702 in different forming processes according to actual stratum conditions, the test result is more accurate, more economic and efficient, and theoretical support is provided for safely exploiting natural gas hydrates in sedimentary layers at different angles; the method can accurately measure the mechanical properties of the hydrates in different sedimentary layers, discuss the occurrence mechanisms of geological disasters such as landslide and sedimentary layer collapse in the natural gas hydrate exploitation process, provide theoretical support and research direction for safely and efficiently exploiting the natural gas hydrate, avoid the occurrence of the geological disasters and accelerate the exploitation and utilization of the natural gas hydrate.
According to a further optimized scheme, the sample preparation assembly comprises a hydraulic oil cylinder 2 fixedly connected with the top wall 31 of the frame 1, the output end of the hydraulic oil cylinder 2 is fixedly connected with a pressure head 4, and the bottom end of the pressure head 4 is provided with an oblique angle; the hydraulic cylinder 2 is fixedly connected with a third sensor 26, and the third sensor 26 is electrically connected with the data collection assembly. The pressure head 4 is fixedly connected with the output end of the hydraulic oil cylinder 2 through bolts or other modes, different oblique angles can be obtained by replacing the pressure head 4, and then samples 7 with different oblique angles are obtained by pressing; the third sensor 26 is used for measuring the pressing distance of the pressing head 4, and under the condition that the aggregate is filled to a certain extent, the porosity and the pressure of the sample 7 are calculated through the pressing distance, so that different deposition layer consolidation degrees are simulated.
Furthermore, in order to facilitate the installation of the hydraulic oil cylinder 2 and reduce the pressure of the hydraulic oil cylinder 2 on the frame 1, a reinforcing plate 3 is arranged between the hydraulic oil cylinder 2 and the frame 1, and two ends of the reinforcing plate 3 are fixedly connected with the frame 1 and the base of the hydraulic oil cylinder 2 through bolts respectively.
According to a further optimized scheme, the mold comprises a sample cylinder 5 fixedly connected with the bottom surface of the frame 1, and an inner cavity of the sample cylinder 5 is matched with the pressure head 4; the bottom end of the inner cavity of the sample cylinder 5 is fixedly connected with a bottom wall 6, and the bottom wall 6 is detachably connected with the bottom end of the frame 1. When a sample 7 is prepared, the indenter 4 is removed and inserted into the sample tube 5, the assembly is inverted, aggregate is filled into the sample tube 5 from the bottom wall 6, and the bottom wall 6 is fixedly connected to the frame 1 by bolts or threads.
Furthermore, the sample 7 is formed by pressing aggregate and other substances, and different deposition layer conditions can be simulated due to different pressing pressures; the aggregate is generally selected from common stratum materials such as quartz sand, kaolin, Fenpu sand and the like, and can also be selected from samples of target strata.
In a further optimized scheme, the test main body 8 comprises a main body frame 12, and the bottom end of the main body frame 12 is fixedly connected with the top surface of the test bed 29; an inner pressure surrounding chamber 15 is arranged on the bottom surface of the inner cavity of the main body frame 12, and the inner cavity of the inner pressure surrounding chamber 15 is used for installing the test sample 7; the outer wall of the inner surrounding pressure chamber 15 is wound with a heat exchanger 30; the top end of the inner confining pressure chamber 15 is provided with a confining pressure chamber 13 which is arranged corresponding to the inner confining pressure chamber 15, and the confining pressure chamber 13 is connected with the side wall of the main body frame 12 in a sliding manner; the top surface of the main body frame 12 is fixedly connected with a pressure applying component, the pressure applying component is fixedly connected with the confining pressure chamber 13, and the pressure applying component is electrically connected with the data collecting component; inner plenum 15 is in communication with the fluid supply assembly and the fluid recovery assembly; plenum 13 communicates with the fluid supply assembly and the fluid recovery assembly.
Further, a heat exchanger 30 for exchanging heat with the sample 7 in the inner pressure chamber 15 is fixed to the outside of the inner pressure chamber 15, and is used for adjusting the temperature of the sample 7 in the inner pressure chamber 15.
Further, the fluid supply assembly comprises a separate test fluid supply device and a separate temperature regulating fluid supply device, and the fluid recovery assembly comprises a separate test fluid recovery device and a separate temperature regulating fluid recovery device; wherein, two ends of the inner surrounding pressure chamber 15 are respectively communicated with the test fluid supply device and the test fluid recovery device, and are used for supplying and recovering the fluid for the test to the inner surrounding pressure chamber 15, and the supply amount and the recovery amount of the fluid for the test need to be measured and recorded for later analysis of the test rule; the two ends of the confining pressure chamber 13 are respectively communicated with the temperature adjusting fluid supply device and the temperature adjusting fluid recovery device, and the confining pressure chamber 13 is supplied with and recovers fluid for adjusting the temperature of the inner confining pressure chamber 15, the inlet and outlet amount of the fluid for adjusting the temperature does not need to be measured, the fluid only needs to be matched with the heat exchanger 30 for temperature adjustment, the temperature is reduced, the temperature is raised, the temperature is kept constant, and a proper test environment is created.
Further, the pressure applying assembly comprises a pressure applying oil cylinder 10 fixed at the top end of the main body frame 12, and the pressure applying oil cylinder 10 is fixedly connected with the confining pressure chamber 13; an oil cylinder accessory 11 is arranged on the periphery of the pressure applying oil cylinder 10, and the oil cylinder accessory 11 comprises a servo valve and a hydraulic valve block small energy accumulator; the output end of the pressure applying oil cylinder 10 is fixedly connected with the top end of the confining pressure chamber 13 and is used for pushing the confining pressure chamber 13 to move downwards and applying pressure to the sample 7 in the confining pressure chamber 15; the top end of the pressure applying oil cylinder 10 is provided with a magnetostrictive displacement sensor 9, and the magnetostrictive displacement sensor 9 is electrically connected with the data collection module 27.
Further, a lifting oil cylinder 16 is arranged at the lower end of the main body frame 12 and used for adjusting the position of the whole device and lifting partial parts.
Further, the side wall of the main body frame 12 is longitudinally connected with a plurality of linear sliders 14 in a sliding manner, and the linear sliders 14 are fixedly connected with the outer wall of the confining pressure chamber 13 to limit the ascending or descending of the confining pressure chamber 13.
According to the further optimized scheme, the bottom end of the confining pressure chamber 13 is fixedly connected with an aligning block 17, and the aligning block 17 is abutted against the inner confining pressure chamber 15; the adjusting block 17 is provided with a built-in load sensor 18, and the built-in load sensor 18 is electrically connected with the data collecting component.
In a further optimized scheme, the lower end of the inner pressure surrounding chamber 15 is fixedly connected with the main body frame 12 through a supporting plate 19, and the fluid recovery assembly penetrates through the supporting plate 19 and then is communicated with an inner cavity of the inner pressure surrounding chamber 15; the top wall 31 of the inner confining pressure chamber 15 is in sliding connection with the inner cavity of the inner confining pressure chamber 15, and the aligning block 17 is abutted to the top wall 31; the fluid supply assembly penetrates through the centering block 17 and the top wall 31 and then is communicated with the inner cavity of the inner surrounding pressure chamber 15; the inner cavity of the inner surrounding pressure chamber 15 is used for installing the test sample 7, the test sample 7 is divided into a first test block 701 and a second test block 702, and the first test block 701 and the second test block 702 are matched.
Furthermore, the rubber sleeve is sleeved outside the first test block 701 and the second test block 702 after combination, and then the rubber sleeve is placed into the inner cavity of the inner surrounding pressure chamber 15, so that the first test block 701 and the second test block 702 are prevented from being broken and liquid in the inner surrounding pressure chamber invades into the test block to influence the properties of the test block in the test process.
Further, the test fluid supply device comprises a fluid supply tank 20, the fluid supply tank 20 is communicated with the test main body 8 through a first pipeline 21, a first sensor 24 is communicated with the first pipeline 21, and the first sensor 24 is electrically connected with the data collecting assembly. The fluid supply tank 20 supplies low-temperature hydraulic oil for simulating the confining pressure acting on the test sample 7 and sealing hydraulic oil of the inner cavity of the outer peripheral pressure chamber 13 to the inner peripheral pressure chamber 15 of the test body 8 through a first pipeline 21, supplies fluids for generating natural gas hydrate, such as natural gas and water, to the test sample 7, simulates the generation process of the natural gas hydrate, and the first sensor 24 is used for measuring the fluid flow rate and the fluid pressure in the first pipeline 21 and transmitting data to the data collecting component.
Further, the test fluid recovery device comprises a fluid recovery tank 22, the fluid recovery tank 22 is communicated with the test main body 8 through a second pipeline 23, a second sensor 25 is arranged on the second pipeline 23, and the second sensor 25 is electrically connected with the data collection assembly. The fluid recovery tank 22 recovers the fluid discharged from the support plate 19 in the test body 8 through the second pipe 23 to circulate with the fluid supply tank 20 and the first pipe 21, simulating the production of natural gas hydrates.
Further, the data collection assembly comprises a data collection module 27 and a data processing module 28, wherein the data collection module 27 is electrically connected with the data processing module 28; the data collection module 27 is electrically connected to the first sensor 24, the second sensor 25, the third sensor 26, the magnetostrictive displacement sensor 9, the built-in load sensor 18, and the like, collects data obtained by the sensors, and transmits the data to the data processing module 28 for data processing, so as to obtain a required mechanical law and characteristics.
A hydrate mechanical property test method considering a deposition angle comprises the following test steps:
s1, preparing sample 7; pressing the sample 7 by selecting a proper bevel angle, and recording the data of the sample 7; the sample 7 comprises a first test block 701 and a second test block 702, the first test block 701 comprises two manufacturing methods,
the method comprises the following steps: uniformly mixing the dried aggregate with water glass or other water-soluble adhesives, then filling a certain amount of aggregate from the bottom of a sample cylinder 5 according to design requirements, installing a bottom wall 6, and pressing into a specified size by using a pressure head 4;
the second method comprises the following steps:
filling ion distilled water saturated aggregate into the sample cylinder 5 from the position of the bottom wall 6, and pressing the mixture into a water saturated test block by a pressure head 4 at the temperature of below 0 ℃;
the second block 702 includes three manufacturing methods,
the method comprises the following steps: mixing deionized distilled water with aggregate, filling a certain amount of aggregate from the bottom of the sample cylinder 5 according to design requirements, installing the bottom wall 6, and pressing into a specified size by using a pressure head 4. The first test block 701 and the second test block 702 are combined up and down and then are loaded into the inner confining pressure chamber 15, air in the inner confining pressure chamber 15 and a pipeline is exhausted, pure methane gas is introduced, the methane gas pressure is set and maintained according to a hydrate phase equilibrium curve, when the pressure is not changed, it is proved that hydrate in a test sample is completely generated, deionized distilled water is filled into the inner confining pressure chamber 15, and internal gas is exhausted.
The second method comprises the following steps: mixing ice powder with aggregate, filling a certain amount of aggregate from the bottom of a sample cylinder 5 according to design requirements, installing a bottom wall 6, and pressing the mixture into a specified size by using a pressure head 4. The first test block 701 and the second test block 702 are combined and then are loaded into an inner confining pressure chamber 15, air in the inner confining pressure chamber 15 and a pipeline is exhausted, the temperature is raised to be higher than 0 ℃, ice powder is melted, pure methane gas is introduced, the pressure of the methane gas is set and maintained according to a hydrate phase equilibrium curve, when the pressure is not changed, hydrate in a sample is completely generated, deionized distilled water is filled into the inner confining pressure chamber, and gas in a cavity is exhausted.
The third method comprises the following steps: mixing hydrate powder with aggregate, filling a certain amount of aggregate from the bottom of a sample cylinder 5 according to design requirements, installing a bottom wall 6, and pressing the mixture into a specified size by using a pressure head 4. The first test block 701 and the second test block 702 are combined and then are loaded into the inner confining pressure chamber 15, deionized water is filled into the inner confining pressure chamber 15, and gas in the cavity is exhausted.
The first manufacturing method of the first test block 701 is adapted to the three manufacturing methods of the second test block 702; the second method for manufacturing the first test block 702 is three-phase adaptive to the second method for manufacturing the second test block.
S2, installing a sample 7 to be measured; installing the sample 7 in the inner cavity of the inner confining chamber 15, connecting the fluid supply assembly and the fluid recovery assembly, and connecting the data collection assembly; when the test block is installed, the second test block 702 is installed at the lower end of the inner confining pressure chamber 15, and the plane of the second test block 702 is in contact with the bottom plate of the inner confining pressure chamber 15; the first test block 701 is arranged above the second test block 702, the oblique angle of the first test block 701 is the same as that of the second test block 702, and the first test block 701 and the second test block 702 are spliced with each other; communicating a first pipeline 21 with a central hole of an aligning block 17, aligning and communicating the central hole of the aligning block 17 with a central hole of a top wall 31, further communicating the first pipeline 21 with the top end of an inner confining pressure chamber 15, communicating a second pipeline 23 with a central hole of a support plate 19, aligning and communicating the central hole of the support plate 19 with a central hole of a bottom plate of the inner confining pressure chamber 15, further communicating the second pipeline 23 with the bottom end of an inner cavity of the inner confining pressure chamber 15, and forming circulation of fluid in a fluid supply tank 20 and a fluid recovery tank 22;
s3, carrying out a test; carrying out the test according to the set test target; raising the temperature and the pressure of an inner cavity of the inner confining pressure chamber 15, wherein the temperature is 15-20 ℃, the pressure is 5-10 MPa, and the inner cavity is in a dynamic balance state; the adhesive in the first test block 701 dissolves and the ice in the second test block 702 melts, so that pores are formed, wherein the first test block 701 becomes loose aggregate, and the second test block 702 is cemented together by the hydrate bonding aggregate; then deionized distilled water is injected into the inner cavity of the inner surrounding pressure chamber 15 through the fluid supply box 20 to reach saturation; the pressures of the first pipeline 21 and the second pipeline 23 at the upper end and the lower end of the inner surrounding pressure chamber 15 are gradually changed to form different pressure differences, so that the hydrate of the second sample 7 is decomposed, gas and water generated in the decomposition process enter the fluid recovery tank 22 through the second pipeline 23 for collection and statistics, and the pressure of the first pipeline 21 is ensured to be higher than the pressure of the second pipeline 23 in the process, so that the fluid in the inner cavity of the inner surrounding pressure chamber 15 flows.
S4, collecting test data, and collecting the test data through a data collection assembly; measuring the flow and pressure of the fluid in the first pipe 21 by means of the first sensor 24 and the second sensor 25 and transmitting the data to the data processing module 28; the third sensor 26 is used for recording the pressing distance of the pressure head 4 in the manufacturing process of the sample 7, and further calculating the pressure borne by the sample 7; the magnetostrictive displacement sensor 9 is used for measuring the moving distance of the pressurizing oil cylinder 10 driving the confining pressure chamber 13, and the built-in load sensor 18 is used for calculating the pressure of the centering block 17 on the top wall 31 of the confining pressure chamber 15.
And S5, processing the test data, analyzing and processing the data recorded by the data collection assembly, and summarizing the rule.
In a further preferred embodiment, in step S1, when the sample 7 is prepared, the aggregate is filled from the bottom wall 6; the temperature for producing sample 7 was not higher than 0 ℃. Because the bottom surface of the pressure head 4 has an oblique angle, if the aggregate is placed at the top end of the sample cylinder 5, the top surface of the aggregate is inconvenient to adjust, so that the pressed sample 7 is uneven in internal pressure, and the test result is influenced. Stretch into sample cylinder 5 certain distance earlier pressure head 4, block up sample cylinder 5's import completely, then take off diapire 6, put into quantitative aggregate from diapire 6, install diapire 6 again back, then suppress, because the top surface of diapire 6 is the plane, only need with the exposed surface of aggregate floating can, the sample 7 atress that the suppression obtained is even.
The test method comprises the following steps:
manufacturing a first test block 701:
uniformly mixing dried aggregate with water glass or other water-soluble adhesives, then filling a certain amount of aggregate from the bottom of a sample cylinder 5 according to design requirements, installing a bottom wall 6, and pressing into a specified size by using a pressure head 4;
filling ion distilled water saturated aggregate into a sample cylinder 5 from the position of a bottom wall 6, and pressing the mixture into a water saturated test block by using a pressure head 4 at the temperature of below 0 ℃;
making a second test block 702:
the method is that deionized distilled water is mixed with aggregate, then a certain amount of aggregate is filled from the bottom of a sample cylinder 5 according to the design requirement, a bottom wall 6 is arranged, and a pressure head 4 is used for pressing the aggregate into a specified size. The first test block 701 and the second test block 702 are combined up and down and then are loaded into the inner confining pressure chamber 15, air in the inner confining pressure chamber 15 and a pipeline is exhausted, pure methane gas is introduced, the methane gas pressure is set and maintained according to a hydrate phase equilibrium curve, when the pressure is not changed, it is proved that hydrate in a test sample is completely generated, deionized distilled water is filled into the inner confining pressure chamber 15, and internal gas is exhausted.
The method secondly mixes the ice powder with the aggregate, then fills a certain amount of aggregate from the bottom of the sample cylinder 5 according to the design requirement, installs the bottom wall 6, and presses the mixture into the specified size by the pressure head 4. The first test block 701 and the second test block 702 are combined and then are loaded into an inner confining pressure chamber 15, air in the inner confining pressure chamber 15 and a pipeline is exhausted, the temperature is raised to be higher than 0 ℃, ice powder is melted, pure methane gas is introduced, the pressure of the methane gas is set and maintained according to a hydrate phase equilibrium curve, when the pressure is not changed, hydrate in a sample is completely generated, deionized distilled water is filled into the inner confining pressure chamber, and gas in a cavity is exhausted.
Mixing hydrate powder with aggregate, filling a certain amount of aggregate from the bottom of a sample cylinder 5 according to design requirements, installing a bottom wall 6, and pressing the mixture into a specified size by using a pressure head 4. The first test block 701 and the second test block 702 are combined and then are loaded into the inner confining pressure chamber 15, deionized water is filled into the inner confining pressure chamber 15, and gas in the cavity is exhausted.
And selecting a proper manufacturing mode of the first test block 701 and the second test block 702 according to the test conditions and the test requirements, and then matching.
Mounting a sample to be measured 7:
installing the sample 7 in the inner cavity of the inner confining chamber 15, connecting the fluid supply assembly and the fluid recovery assembly, and connecting the data collection assembly; when the test block is installed, the second test block 702 is installed at the lower end of the inner confining pressure chamber 15, and the plane of the second test block 702 is in contact with the bottom plate of the inner confining pressure chamber 15; the first test block 701 is arranged above the second test block 702, the oblique angle of the first test block 701 is the same as that of the second test block 702, and the first test block 701 and the second test block 702 are spliced with each other; the first pipeline 21 is communicated with a center hole of the center adjusting block 17, the center hole of the center adjusting block 17 is communicated with a center hole of the top wall 31 in an aligning mode, so that the first pipeline 21 is communicated with the top end of the inner surrounding pressure chamber 15, the second pipeline 23 is communicated with a center hole of the support plate 19, the center hole of the support plate 19 is communicated with a center hole of a bottom plate of the inner surrounding pressure chamber 15 in an aligning mode, the second pipeline 23 is communicated with the bottom end of an inner cavity of the inner surrounding pressure chamber 15, and fluids in the fluid supply tank 20 and the fluid recovery tank 22 form circulation.
The test was carried out:
carrying out the test according to the set test target; raising the temperature and the pressure of an inner cavity of the inner confining pressure chamber 15, wherein the temperature is 15-20 ℃, the pressure is 5-10 MPa, and the inner cavity is in a dynamic balance state; the ice in the first test block 701 and the second test block 702 melts to form pores, at this time, the first test block 701 becomes loose aggregate, and the second test block 702 is bonded by the hydrate and cannot be broken; then deionized distilled water is injected into the inner cavity of the inner surrounding pressure chamber 15 through the fluid supply box 20 to reach saturation; and then gradually changing the pressure of the first pipeline 21 and the second pipeline 23 at the upper end and the lower end of the inner confining pressure chamber 15 to form different pressure differences, so that the hydrate of the second test block 702 is decomposed, gas and water generated in the decomposition process enter the fluid recovery tank 22 through the second pipeline 23 for collection and statistics, and the pressure of the first pipeline 21 is ensured to be higher than the pressure of the second pipeline 23 all the time in the process, so that the fluid in the inner cavity of the inner confining pressure chamber 15 flows.
Collecting and processing test data:
collecting test data by a data collection component; measuring the flow and pressure of the fluid in the first pipe 21 by means of the first sensor 24 and the second sensor 25 and transmitting the data to the data processing module 28; the third sensor 26 is used for recording the pressing distance of the pressure head 4 in the manufacturing process of the sample 7, and further calculating the pressure borne by the sample 7; the magnetostrictive displacement sensor 9 is used for measuring the moving distance of the pressurizing oil cylinder 10 driving the confining pressure chamber 13, and the built-in load sensor 18 is used for calculating the pressure of the centering block 17 on the top wall 31 of the confining pressure chamber 15; and classifying the collected data to obtain the required mechanical characteristics of the natural gas hydrate sample 7 considering the reservoir deposition angle.
The device has the advantages of simple structure and strong applicability, can conveniently simulate the mechanical characteristics of the natural gas hydrate sedimentary deposit at different angles, is convenient for test and research, greatly shortens the test process, simplifies the test process, and provides theoretical support for the safe and efficient exploitation of the natural gas hydrate sedimentary deposit at different angles.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (10)

1. A hydrate mechanical property test device considering a deposition angle comprises a test bed (29), and is characterized in that: the test bed (29) is provided with a sample preparation part and a test part;
the sample preparation part comprises a frame (1), and the frame (1) is detachably connected with the top surface of the test bed (29); the sample preparation component is fixedly connected to the top surface of the frame (1), an oblique angle is arranged at the bottom end of the sample preparation component, and the sample preparation component is electrically connected with the test part; a mould for manufacturing a sample (7) is arranged below the sample preparation assembly;
the test part comprises a test main body (8) for mounting the sample (7) and a data collection assembly, wherein a fluid supply assembly and a fluid recovery assembly are respectively communicated with two ends of the test main body (8), and are respectively electrically connected with the data collection assembly; the sample preparation assembly is electrically connected with the data collection assembly.
2. The hydrate mechanical property test device considering the deposition angle as claimed in claim 1, wherein: the sample preparation assembly comprises a hydraulic oil cylinder (2) fixedly connected with the top end of the frame (1), the output end of the hydraulic oil cylinder (2) is fixedly connected with a pressure head (4), and the bottom end of the pressure head (4) is provided with the bevel; and a third sensor (26) is fixedly connected to the hydraulic oil cylinder (2), and the third sensor (26) is electrically connected with the data collection assembly.
3. The hydrate mechanical property test device considering the deposition angle as claimed in claim 2, wherein: the die comprises a sample cylinder (5) fixedly connected with the bottom surface of the frame (1), and the inner cavity of the sample cylinder (5) is matched with the pressure head (4); the bottom end of the inner cavity of the sample cylinder (5) is fixedly connected with a bottom wall (6), and the bottom wall (6) is detachably connected with the bottom end of the frame (1).
4. The hydrate mechanical property test device considering the deposition angle as claimed in claim 1, wherein: the test main body (8) comprises a main body frame (12), and the bottom end of the main body frame (12) is fixedly connected with the top surface of the test bed (29); an inner surrounding pressure chamber (15) is arranged on the bottom surface of the inner cavity of the main body frame (12), and the inner cavity of the inner surrounding pressure chamber (15) is used for mounting the test sample (7); the outer wall of the inner surrounding pressure chamber (15) is provided with a heat exchanger (30) in a surrounding way; a confining pressure chamber (13) which is coaxially arranged with the inner confining pressure chamber (15) is arranged outside the inner confining pressure chamber (15), and the confining pressure chamber (13) is in sliding connection with the side wall of the main body frame (12); a pressure applying assembly is fixedly connected to the top surface of the main body frame (12), the pressure applying assembly is fixedly connected with the confining pressure chamber (13), and the pressure applying assembly is electrically connected with the data collecting assembly; the inner plenum (15) and the plenum (13) are in communication with the fluid recovery assembly and the fluid supply assembly, respectively.
5. The hydrate mechanical property test device considering the deposition angle as claimed in claim 4, wherein: an adjusting block (17) is fixedly connected to the bottom end of the confining pressure chamber (13), and the adjusting block (17) is abutted to the inner confining pressure chamber (15); the aligning block (17) is provided with a built-in load sensor (18), and the built-in load sensor (18) is electrically connected with the data collecting assembly.
6. The hydrate mechanical property test device considering the deposition angle as claimed in claim 5, wherein: the lower end of the inner confining pressure chamber (15) is fixedly connected with the main body frame (12) through a supporting plate (19), and the fluid recovery assembly penetrates through the supporting plate (19) and then is communicated with the inner cavity of the inner confining pressure chamber (15); the top wall (31) of the inner pressure surrounding chamber (15) is in sliding connection with the inner cavity of the inner pressure surrounding chamber (15), and the centering block (17) is abutted to the top wall (31); the fluid supply assembly penetrates through the centering block (17) and the top wall (31) and then is communicated with an inner cavity of the inner confining pressure chamber (15); the inner cavity of the inner confining pressure chamber (15) is used for installing the test sample (7), the test sample (7) is divided into a first test block (701) and a second test block (702), and the first test block (701) is matched with the second test block (702).
7. A method for testing mechanical properties of hydrates in consideration of a deposition angle, which is the device for testing mechanical properties of hydrates in consideration of a deposition angle as claimed in any one of claims 1 to 6, and is characterized by comprising the following test steps:
s1, preparing the sample (7); pressing the test sample (7) by selecting a proper bevel angle, and recording the data of the test sample (7);
s2, installing the sample (7) to be measured; mounting the test specimen (7) into the inner cavity of the inner plenum (15), connecting the fluid supply assembly and the fluid recovery assembly, and connecting the data collection assembly;
s3, carrying out a test; carrying out the test according to the set test target;
s4, collecting test data, and collecting the test data through the data collection component;
and S5, processing the test data, analyzing and processing the data collected by the data collection component, and summarizing rules.
8. The method for testing mechanical properties of hydrates in consideration of a deposition angle according to claim 7, wherein: in the step S1, when the sample (7) is produced, the aggregate is filled from the position of the bottom wall (6); the sample (7) was prepared at a temperature of not higher than 0 ℃.
9. The method for testing mechanical properties of hydrates in consideration of a deposition angle according to claim 8, wherein: in the step S1, the first test block (701) includes only two manufacturing methods, and the second test block (702) includes three manufacturing methods.
10. The method for testing mechanical properties of hydrates in consideration of a deposition angle according to claim 7, wherein: in the step S2, the center hole of the aligning block (17) is aligned with the center hole of the top wall (31).
CN202111269922.9A 2021-10-29 2021-10-29 Hydrate mechanical property test device and method considering deposition angle Pending CN114002073A (en)

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