CN110595893A - Hydrate-containing sediment consolidation static exploration penetration simulation device and method - Google Patents
Hydrate-containing sediment consolidation static exploration penetration simulation device and method Download PDFInfo
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- CN110595893A CN110595893A CN201910999674.XA CN201910999674A CN110595893A CN 110595893 A CN110595893 A CN 110595893A CN 201910999674 A CN201910999674 A CN 201910999674A CN 110595893 A CN110595893 A CN 110595893A
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- 230000003068 static effect Effects 0.000 title claims abstract description 49
- 238000004088 simulation Methods 0.000 title claims abstract description 25
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 23
- 229920006395 saturated elastomer Polymers 0.000 claims description 12
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- 238000006243 chemical reaction Methods 0.000 claims description 5
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 abstract description 5
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
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Classifications
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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
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- 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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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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
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- 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
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- 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
- G01N2203/023—Pressure
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- 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
- G01N2203/0236—Other environments
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a hydrate-containing sediment consolidation static penetration simulation device and method, which belong to the field of marine natural gas hydrate exploitation. The hydrate-containing sediment consolidation static penetration simulation method adopts the hydrate-containing sediment consolidation static penetration simulation device. Vertical pressure is applied to the hydrate-containing sediment through the consolidation subsystem to simulate the working condition of the hydrate-containing sediment at different depths in the sea, the stress level of a hydrate reservoir similar to the sea bottom can be applied, and an engineering static penetration simulation test is carried out, so that basic data are provided for building hydrate sediment engineering parameter calculation models under different reservoir conditions.
Description
Technical Field
The invention relates to the field of marine natural gas hydrate exploitation, in particular to a hydrate-containing sediment consolidation static exploration penetration simulation device and method.
Background
The natural gas hydrate is a cage-shaped compound formed by combining methane gas and water under certain temperature and pressure conditions, and is generally distributed in land permafrost zones or deep sea shallow sediments at the edges of continents. When the hydrate is mined, no matter the stability evaluation and sand production analysis of a mined reservoir stratum or the estimation of mining induced geological disasters, the mechanical parameters of the hydrate reservoir stratum need to be accurately acquired, and the dependence of the parameters on the overburden pressure, the hydrate saturation and the reservoir stratum soil characteristics needs to be quantitatively explained.
In-situ tests and indoor geotechnical tests are the main means for obtaining the mechanical properties of hydrate reservoirs. The indoor geotechnical test generally adopts manual preparation sample, because the pressurize heat preservation degree of difficulty of on-the-spot drilling sample is very big, and it is more difficult that the sample transfers into indoor test instrument from the pressurize cabin low disturbance. The state of the artificially prepared sample has certain difference with the field, and the direct determination of the hydrate reservoir parameters through the in-situ test is a more feasible solution.
The static cone penetration test is the most common in-situ test method for obtaining the mechanical properties of sediments in ocean engineering. The conical probe and the connected friction cylinder are penetrated into the sediment at a constant speed, and the continuous change of the cone tip resistance, the side friction resistance and the pore water pressure along with the penetration depth is recorded, so that the shear strength, the super-consolidation ratio, the sensitivity, the consolidation coefficient and the like of the soil are calculated.
The soil containing hydrate can be regarded as a special soil body, and a plurality of key mechanical parameters can be efficiently and reasonably provided through a static sounding test, so that the difficulty of pressure maintaining, heat preservation and sampling is avoided. However, the mechanical properties of the soil containing hydrate are closely related to factors such as the saturation of the hydrate, the cementation and filling states of hydrate particles in the soil and the like, and due to the difference of the density of soil layers at different depths of the seabed, the mechanical parameters of the soil containing hydrate in the soil layers at different depths cannot be obtained in the static exploration parameter simulation experiment of the engineering containing the hydrate deposit at present, so that the analysis and evaluation on the properties of the hydrate deposit are inaccurate.
Disclosure of Invention
The invention aims to provide a hydrate-containing sediment consolidation static penetration simulation device and method, which aim to solve the technical problem that the mechanical parameters of hydrate-containing soil in different depth soil layers cannot be obtained in the prior art.
As the conception, the technical scheme adopted by the invention is as follows:
a hydrate-containing sediment consolidation static penetration simulator, comprising:
the reaction kettle subsystem comprises a kettle body and an end cover arranged at the top end of the kettle body, wherein the bottom end of the kettle body is provided with an air inlet, and the end cover is provided with an air outlet;
an upper support part connected with the end cover;
the consolidation subsystem comprises a first power mechanism, a consolidation platform connected with the first power mechanism and a pressure plate connected with the consolidation platform, the consolidation platform is slidably connected with the upper supporting part, and the pressure plate is positioned in the kettle body;
static sounding subsystem, including second power unit, with the penetration platform that second power unit connects, with the probe rod that the penetration platform is connected and with the probe that the probe rod is connected, the penetration platform with go up supporting part sliding connection, the probe rod runs through the pressure plate, the probe is located this internal.
The consolidation subsystem further comprises a pressurizing rod, the pressurizing rod penetrates through the end cover, one end of the pressurizing rod is connected with the consolidation platform, and the other end of the pressurizing rod is connected with the pressurizing plate.
Wherein, the pressurizing rod is connected with the end cover in a sealing way.
The pressurizing rod is provided with a pressure sensor, and the consolidation platform is provided with a displacement sensor.
The water outlet is formed in the kettle body, the pressurizing plate is a hollow plate, and the water permeable plate is laid at the bottom end of the kettle body in the kettle body.
Wherein, the outer wall of cauldron body is gone up around being equipped with the pipeline, the outside of cauldron body and all cover on the end cover and have the heat preservation.
Wherein, go up the bracing part including two piece at least bracing pieces that the interval set up, the one end of bracing piece with the end cover is connected, concretize the platform with the penetration platform all with bracing piece sliding connection.
The static sounding subsystem further comprises a data acquisition instrument connected with the probe.
The first power mechanism and the second power mechanism both comprise a motor and a planetary roller screw.
The hydrate-containing sediment consolidation static probing penetration simulation method adopts the hydrate-containing sediment consolidation static probing penetration simulation device and comprises the following steps:
placing the saturated water sediment in the kettle body, and keeping a set distance between the saturated water sediment and the end cover;
injecting methane through an air inlet on the kettle body, simulating the upward permeation process of the gas and generating a hydrate-containing sediment;
the consolidation platform is driven by the first power mechanism to slide along the upper supporting part, so that the pressurizing plate is driven to linearly move in the kettle body, and vertical pressure is applied to the hydrate-containing sediment;
the penetration platform is driven by the second power mechanism to slide along the upper supporting part, so that the probe rod is driven to linearly move in the kettle body, and the probe is penetrated into the hydrate-containing sediment.
The invention has the beneficial effects that:
according to the hydrate-containing sediment consolidation static penetration simulation device provided by the invention, the consolidation subsystem can apply vertical consolidation pressure to the hydrate-containing sediment to simulate the working condition of the hydrate-containing sediment at different depths in the sea, can apply the stress level of a hydrate reservoir stratum close to the sea bottom, and can carry out an engineering static penetration simulation test, so that basic data are provided for building hydrate sediment engineering parameter calculation models under different reservoir stratum conditions, and the measurement result is more accurate.
Drawings
FIG. 1 is a schematic diagram of a hydrate-containing sediment consolidation static penetration simulation device provided by an embodiment of the invention.
In the figure:
11. a kettle body; 12. an end cap; 13. a pipeline; 14. a water outlet; 15. a water permeable plate;
21. a support bar; 22. a support platform;
31. a consolidation platform; 32. a pressurizing plate; 33. a pressurizing rod; 34. a pressure sensor; 35. a displacement sensor; 36. a first motor; 37. a first lead screw;
41. a penetration platform; 42. a probe rod; 43. a data acquisition instrument; 44. a second motor; 45. a second lead screw;
51. a support frame.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1, an embodiment of the present invention provides a hydrate-containing sediment consolidation static penetration simulation apparatus, which mainly includes a reaction kettle subsystem, an upper support portion, a lower support portion, a consolidation subsystem, a static sounding subsystem, and a temperature control subsystem, which are respectively described in detail below.
The reaction kettle subsystem comprises a kettle body 11 and an end cover 12 arranged at the top end of the kettle body 11, the end cover 12 is detachably connected with the kettle body 11, and hydrate-containing sediments can be contained in the kettle body 11. The upper supporting part is connected with the end cover 12, and the lower supporting part is connected with the kettle body 11.
A sealing ring, specifically a double-layer rubber seal, is arranged between the end cover 12 and the kettle body 11. The end cover 12 is connected with the kettle body 11 through a hoop, so that the installation and the disassembly are convenient, the structure of the hoop is not described again, and the prior art can be referred to. In this embodiment, the tank body 11 is made of titanium alloy.
The bottom of cauldron body 11 is provided with the air inlet, is provided with the gas outlet on the end cover 12. The air inlet is connected with the air source, and the air outlet can be used for recycling air so as to ensure safety. After the saturated water deposit was placed in the tank body 11, methane was injected through the inlet on the tank body 11, simulating the gas permeation process upward and producing a hydrate-containing deposit.
The outer wall of the kettle body 11 is wound with a pipeline 13 for controlling the temperature of the liquid bath, and the fluid in the pipeline 13 is ethylene glycol aqueous solution. When methane is injected into the tank body 11, the fluid having a low temperature in the pipe 13 exchanges heat with the tank body 11 to reduce the temperature inside the tank body 11. The inlet and outlet of the pipeline 13 are both located at the bottom end of the tank body 11, which facilitates the injection and recovery of the fluid. Pipeline 13 and the outer wall local weld of cauldron body 11 for pipeline 13 and cauldron body 11 in close contact with increase coefficient of heat conductivity. In this embodiment, the pipe 13 is a copper pipe.
The outside of cauldron body 11 and end cover 12 all cover and are stamped the heat preservation for temperature in the stable cauldron body 11. The heat-insulating layer is mainly composed of rock wool and has the characteristics of flame retardance and heat insulation. The thickness of the rock wool in the heat-insulating layer is 50 mm. The outside of heat preservation is provided with outer protective layer, and outer protective layer uses thin corrosion resistant plate parcel, has advantages such as pleasing to the eye, anticorrosive, fire prevention.
The top end and the bottom end of the kettle body 11 are respectively provided with a temperature measuring point, two temperature measuring points are arranged inside the sediment containing the hydrate in the kettle body 11, the internal temperature measuring points are used for judging whether the temperature of the sediment containing the hydrate in the kettle body 11 is consistent with a set temperature, 4 temperature measuring points are arranged, and each temperature measuring point is provided with a temperature sensor. The end cover 12 is provided with an air pressure sensor and a safety valve, when the pressure of the gas in the kettle body 11 is abnormally higher than a set value (30MPa), the safety valve is automatically opened and then fully discharged, and when the pressure is reduced to the set value, the safety valve is automatically closed, so that the safe operation of the equipment is ensured.
Wherein the temperature of the methane can be controlled by a temperature control subsystem. The temperature control subsystem comprises a gas heat exchanger, a refrigerant is introduced into the gas heat exchanger through a refrigeration system, and the temperature of introduced methane gas is reduced to be lowest-10 ℃ from the highest 30 ℃ by utilizing a cooling circulation system. In the actual use process, the output power of the refrigerating system is automatically controlled and adjusted according to the data fed back by the temperature sensor in the kettle body 11, the temperature in the kettle body 11 is stabilized at a certain specific temperature between minus 10 ℃ and 20 ℃, and the temperature condition of the actual sea natural gas hydrate reservoir is simulated.
Of course, the reaction kettle subsystem also comprises a state monitoring module which mainly comprises temperature monitoring, pressure monitoring, circuit monitoring and flow monitoring. The temperature monitoring mainly monitors the outlet temperature of the refrigerant, the outlet temperature of the methane gas and the temperature of 4 temperature measuring points inside the kettle body 11. The pressure monitoring mainly monitors the pressure inside the kettle body 11 and the pressure at the outlet of the gas heat exchanger. The circuit monitoring mainly monitors the power supply states of the temperature control subsystem and the data acquisition system. Flow monitoring primarily monitors methane gas outlet flow. The state monitoring module can be set according to actual needs, and is not described in detail herein.
The consolidation subsystem comprises a first power mechanism, a consolidation platform 31 connected with the first power mechanism and a pressure plate 32 connected with the consolidation platform 31, the consolidation platform 31 is slidably connected with the upper support part, and the pressure plate 32 is positioned in the kettle body 11. The consolidation platform 31 can be driven to slide along the upper supporting part through the first power mechanism, so that the pressurizing plate 32 is driven to move linearly in the kettle body 11, and vertical pressure is applied to hydrate-containing sediments. The vertical load, drainage consolidation and simulation of the effective stress level at the actual depth of the submarine reservoir are mainly realized on the hydrate-containing sediment in the kettle body 11.
The consolidation subsystem further comprises a pressure rod 33, the pressure rod 33 penetrates through the end cover 12, one end of the pressure rod 33 is connected with the consolidation platform 31, and the other end of the pressure rod 33 is connected with the pressure plate 32. The pressure rods 33 transmit the motion of the consolidation platform 31 to the pressure plate 32, and the pressure plate 32 can apply a uniform load on the surface of the hydrate-containing deposit inside the tank body 11. The shape of the pressurizing plate 32 is set in accordance with the sectional shape of the internal cavity of the tank body 11. In this embodiment, the pressurizing plate 32 is a circular plate having the same diameter as the inner diameter of the tank body 11.
The pressurizing rod 33 is connected with the end cover 12 in a sealing mode. Three layers of sealing rings are arranged at the matching position of the pressurizing rod 33 and the end cover 12, so that the overall sealing performance of the kettle body 11 is ensured and the pressure drop caused by leakage is prevented when the pressurizing operation is executed.
The pressure sensor 34 is arranged on the pressure rod 33, and the measuring range of the pressure sensor 34 is 20MPa and is used for measuring the applied vertical pressure. The consolidation platform 31 is provided with a displacement sensor 35, and the displacement sensor 35 measures the deformation settlement of the soil body in the kettle body 11 in the consolidation process. In this embodiment, the pressure sensor 34 is a load pressure sensor, and the displacement sensor 35 is a laser displacement sensor.
The tank body 11 is provided with a drain port 14. The pressing plate 32 is a hollowed-out plate for draining the hydrate-containing deposit upper layer to the drain opening 14 after vertical pressing. A water permeable plate 15 is laid at the bottom end of the kettle body 11 in the kettle body 11 and is used for draining the hydrate sediment at the lower layer to a water outlet 14 after vertical pressurization. The hydrate-containing deposit can be drained up and down simultaneously during the pressurization. Specifically, the pressing plate 32 is a hollow titanium alloy circular plate.
The static sounding subsystem comprises a second power mechanism, a penetration platform 41 connected with the second power mechanism, a probe 42 connected with the penetration platform 41 and a probe connected with the probe 42, the penetration platform 41 is slidably connected with the upper supporting part, the probe 42 penetrates through the pressurizing plate 32, and the probe is positioned in the kettle body 11. The penetration platform 41 is driven by the second power mechanism to slide along the upper supporting part, so as to drive the probe rod 42 to move linearly in the kettle body 11, and the probe is made to penetrate into the hydrate-containing sediment. The static detection parameter measuring device mainly realizes measurement of static detection parameters of sediments containing the hydrate in the kettle body 11, and comprises cone tip resistance (the measurement range is 0-10 MPa, the test precision is 0.5%), side friction resistance (0-1 MPa, the test precision is 0.5%), pore water pressure (0-20 MPa, the test precision is 0.5%), resistivity (the range is 0-5000 omega m, and the test precision is 0.5%) and image (100W pixel) data of a penetration path.
The probe rod 42 penetrates through the end cover 12 and extends into the kettle body 11, a central hole is formed in the end cover 12, three layers of sealing rings are arranged at the matching position of the central hole and the probe rod 42, and therefore when the injection operation is executed, the overall sealing performance of the kettle body 11 is guaranteed, and the pressure intensity reduction caused by leakage is prevented. The probe rod 42 is made of a duplex stainless steel pipe with a specially treated surface, has good sealing performance with the end cover 12, and can keep good sealing effect under the pressure of 30 MPa. The center of the pressure plate 32 is reserved with a circular hole with the same diameter as the probe rod 42, so that the probe rod 42 can pass through the circular hole conveniently.
The static sounding subsystem further comprises a data acquisition instrument 43 connected with the probe, mainly refers to static sounding acquisition software, and can monitor acquisition of parameters such as cone tip resistance, side friction resistance, pore pressure and resistivity value in the static sounding process at a main interface and automatically record the parameters at a background. The collected data can be exported, can be collected in real time, can be displayed in a software interface in real time, and provides a manual correction interface. The data collector 43 is disposed on the penetration platform 41.
The upper support part comprises at least two support rods 21 arranged at intervals, and one end of each support rod 21 is connected with the end cover 12. Consolidation platform 31 and penetration platform 41 all with bracing piece 21 sliding connection, bracing piece 21 plays spacing and guide effect. Go up the supporting part still including setting up in bracing piece 21 and keeping away from the supporting platform 22 of the one end of cauldron body 11, the last rings that are provided with of supporting platform 22, the transportation of being convenient for. The lower supporting part comprises two supporting frames 51 arranged at intervals, one end of each supporting frame 51 is connected with the kettle body 11, and the supporting frames 51 play roles in positioning and supporting.
In this embodiment, the first power mechanism and the second power mechanism each include a motor and a planetary roller screw. Specifically, the first power mechanism includes a first motor 36 and a first lead screw 37, and the first motor 36 directly drives the first lead screw 37 to rotate or the first motor 36 indirectly drives the first lead screw 37 to rotate through a transmission mechanism. First motor 36 sets up on bracing piece 21 or first motor 36 sets up on consolidation platform 31, and first lead screw 37's one end and end cover 12 rotate to be connected, and first lead screw 37's the other end pass consolidation platform 31 and with consolidate between the platform 31 threaded connection, because consolidation platform 31 is spacing by bracing piece 21, drive consolidation platform 31 and be linear motion along bracing piece 21 when first lead screw 37 rotates. The second power mechanism comprises a second motor 44 and a second lead screw 45, the second motor 44 is arranged on the supporting platform 22, one end of the second lead screw 45 is rotatably connected with the supporting platform 22, and the other end of the second lead screw 45 penetrates through the consolidation platform 31 to be rotatably connected with the end cover 12. The penetration platform 41 is located between the consolidation platform 31 and the supporting platform 22, the second lead screw 45 is in threaded connection with the penetration platform 41, and the penetration platform 41 is limited by the supporting rod 21, so that the second lead screw 45 drives the penetration platform 41 to move linearly along the supporting rod 21 when rotating.
The first motor 36 and the second motor 44 are both torque motors, and the torque motors have winding characteristics, so that constant tension rotation can be realized, and constant load can be effectively applied. The planetary roller screw allows the load to be quickly released through numerous contact points, thereby enabling higher impact resistance. Parameters of the second motor 44: the injection force is 5kN at 10MPa, and the injection power is 750W.
The static sounding subsystem further comprises a stay wire encoder which is installed on the second motor 44 and connected with the lower end of the probe rod 42 through a metal wire, and when the probe moves in the kettle body 11 under the action of the probe rod 42, the metal wire is driven to move synchronously, so that the penetration depth of the probe is obtained, and the penetration speed of the probe can be indirectly obtained. The coding depth of the stay wire is the basis of the automatic recording of the static sounding and is also the basis for adjusting the penetration speed.
The embodiment of the invention also provides a hydrate-containing sediment consolidation static penetration simulation method, which adopts the hydrate-containing sediment consolidation static penetration simulation device and comprises the following steps:
placing the saturated water sediment in the kettle body 11, and keeping a set distance between the saturated water sediment and the end cover 12;
injecting methane through an air inlet on the kettle body 11 to simulate the upward gas permeation process and generate a hydrate-containing sediment;
the consolidation platform 31 is driven by the first power mechanism to slide along the upper support part, so as to drive the pressurizing plate 32 to linearly move in the kettle body 11, and vertical pressure is applied to hydrate-containing sediments;
the penetration platform 41 is driven by the second power mechanism to slide along the upper supporting part, so as to drive the probe rod 42 to move linearly in the kettle body 11, and the probe is made to penetrate into the hydrate-containing sediment.
Specifically, a space of 20 mm-30 mm is reserved between the saturated water sediment and the end cover 12, so that the height of the saturated water sediment in the kettle body 11 is smaller than the actual effective height of the kettle body 11. The existence of this space is crucial for simulating a real seabed hydrate-containing sediment environment: the saturated water deposits will drain a portion of the water during the upward leakage of the gas, which is deposited in the space between the hydrate-containing deposits and the inner wall of the end cap 12, and the excess water is drained out of the tank body 11. Therefore, the stress applied to the upper end of the sediment containing the hydrate by the part of the water film can be used for simulating the pressure of the actual seawater on the submarine sediment, and the defect that the stress applied to the sediment by the seawater cannot be accurately simulated when the end face of the sediment is directly pressurized by the hard metal in a conventional mechanical experiment is overcome.
When consolidation is performed, the moving speed of the consolidation platform 31 can be controlled through the first motor 36, so as to control the moving speed of the pressurizing plate 32, and the measurement values of the pressure sensor 34 and the displacement sensor 35 are detected in real time, so as to obtain the magnitude of the applied vertical pressure and the deformation settlement amount of the soil body in the kettle body 11. If necessary, the pressurization is stopped when the measured value of the pressure sensor 34 reaches a set value.
Before the probe is used, a probe vacuum saturator is required to be inserted for vacuumizing, and distilled water is saturated in the hole pressure measuring hole. The vacuum degassing is mainly carried out on a pore water pressure conduction cabin of the probe, and pressure-guiding liquid is filled and saturated, so that the influence of air on the pore water pressure detection is reduced. The specific parameters of the probe vacuum saturator are as follows: -0.1 MPa; adapting the type of the probe: 2cm2、5cm2、10cm2、15cm2A pore pressure probe; rated power: 80W.
During static sounding, the penetration rate of the probe is set, generally set to 2mm/s, the second motor 44 is started to gradually press the probe into the hydrate-containing sediment, the cone tip resistance, the side friction resistance, the pore pressure, the resistivity and the video image data of the probe in the process are recorded in real time, and the penetration depth of the probe is recorded in real time through the stay wire encoder. When the penetration depth of the probe is 42cm from the bottom end of the kettle body 11, the penetration is stopped, the second motor 44 is reversed, and the probe is lifted up.
Estimating the longitudinal distribution rule of parameters such as the non-drainage shear strength, the permeability coefficient, the stress path and the like of the sediment containing the hydrate according to the cone tip resistance, the side friction resistance and the pore pressure, calculating the saturation degree of the sediment containing the hydrate in the layer by using the resistivity obtained by measurement, establishing the change rule of engineering static sounding data such as the cone tip resistance, the side friction resistance, the pore pressure and the like along with the saturation degree of the hydrate, and further establishing the change curve of the engineering parameters such as the non-drainage shear strength, the permeability coefficient, the stress path and the like of the sediment along with the saturation degree of the hydrate. And identifying the damage form of the hydrate-containing sediment in the static sounding process by using the video image data in the static sounding process.
Compared with the conventional soil mechanics static sounding device, the invention has the main characteristics that:
(1) the method can completely simulate the temperature field of the actual submarine hydrate-containing sediment, reduce the initial stress state of the reservoir and generate the natural gas hydrate-containing sediment in the sediment by virtue of the pressure of a methane gas source. The function is matched with the static sounding device for use, and the function is not related to all the devices at present.
(2) From the perspective that the indoor simulation experiment is consistent with the on-site deep sea site construction, 5 test parameters are collected on one probe for the first time: cone tip resistance, side friction resistance, pore water pressure, resistivity, and pore volume. The method not only improves the experimental efficiency, but also has very important significance for simultaneously obtaining the heterogeneity of longitudinal mechanical parameters and the heterogeneity of saturation of the sediment containing the hydrate. The measured cone tip resistance, side friction resistance and pore pressure can be calculated according to the engineering strength parameter 1:1 of the field construction, and the measured resistivity parameter can obtain the saturation longitudinal heterogeneity characteristic of the actual hydrate-containing sediment, so that the corresponding research on the saturation heterogeneity of the hydrate-containing sediment engineering strength parameter and the reservoir can be realized.
(3) The main advantages of using a planetary roller screw are: the planetary roller screw load transfer element is a threaded roller, and is typically in line contact; whereas the common ball screw load transfer elements are balls, which are point contacts. The planetary roller screw thus has numerous contact points to support the load. Because the synthetic natural gas hydrate in the test has uncertainty of distribution, uncertainty of soil layer layering is caused, local strength may have large difference, and a line contact mechanism with good impact resistance needs to be selected. When the probe is tapered into a soil layer exceeding the upper safety limit or the tip of the probe is pushed to the bottom end of the kettle body 11 due to reasons such as operation delay and the like, the second motor 44 can have protective stopping to stop propelling, so that the probe is prevented from being damaged.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A hydrate-containing sediment consolidation static penetration simulator, comprising:
the reaction kettle subsystem comprises a kettle body (11) and an end cover (12) arranged at the top end of the kettle body (11), wherein the bottom end of the kettle body (11) is provided with an air inlet, and the end cover (12) is provided with an air outlet;
an upper support part connected with the end cover (12);
the consolidation subsystem comprises a first power mechanism, a consolidation platform (31) connected with the first power mechanism and a pressure plate (32) connected with the consolidation platform (31), the consolidation platform (31) is in sliding connection with the upper supporting part, and the pressure plate (32) is positioned in the kettle body (11);
static sounding subsystem, including second power unit, with injection platform (41) that second power unit connects, with probe rod (42) that injection platform (41) are connected and with the probe that probe rod (42) are connected, injection platform (41) with go up supporting part sliding connection, probe rod (42) run through pressure plate (32), the probe is located in cauldron body (11).
2. The hydrate-containing sediment consolidation static penetration simulation device according to claim 1, wherein the consolidation subsystem further comprises a pressurizing rod (33), the pressurizing rod (33) penetrates through the end cover (12), one end of the pressurizing rod (33) is connected with the consolidation platform (31), and the other end of the pressurizing rod (33) is connected with the pressurizing plate (32).
3. The hydrate-containing sediment consolidation static penetration simulator as defined in claim 2, wherein the pressurization rod (33) is in sealed connection with the end cap (12).
4. The hydrate-containing sediment consolidation static penetration simulator as defined in claim 2, wherein a pressure sensor (34) is provided on the pressurizing rod (33) and a displacement sensor (35) is provided on the consolidation platform (31).
5. The hydrate-containing sediment consolidation static penetration simulation device according to claim 1, wherein a water outlet (14) is arranged on the kettle body (11), the pressure plate (32) is a hollow plate, and a water permeable plate (15) is laid at the bottom end of the kettle body (11) in the kettle body (11).
6. The hydrate-containing sediment consolidation static penetration simulation device according to claim 1, wherein a pipeline (13) is wound on the outer wall of the kettle body (11), and the outer side of the kettle body (11) and the end cover (12) are covered with insulating layers.
7. The hydrate-containing sediment consolidation static penetration simulation device according to claim 1, wherein the upper support part comprises at least two support rods (21) arranged at intervals, one ends of the support rods (21) are connected with the end cover (12), and the consolidation platform (31) and the penetration platform (41) are both connected with the support rods (21) in a sliding manner.
8. The hydrate-containing deposit consolidation penetration simulator of claim 1, wherein the static sounding subsystem further comprises a data acquisition instrument (43) connected to the probe.
9. The hydrate-containing deposit consolidation static penetration simulator of any of claims 1-8, wherein the first powered mechanism and the second powered mechanism each comprise a motor and a planetary roller screw.
10. A hydrate-containing sediment consolidation static probing penetration simulation method, which is characterized in that the hydrate-containing sediment consolidation static probing penetration simulation device as claimed in any one of claims 1 to 9 is adopted, and comprises the following steps:
placing the saturated water sediment in the kettle body (11) to enable a set distance to be reserved between the saturated water sediment and the end cover (12);
injecting methane through an air inlet on the kettle body (11) to simulate the upward gas permeation process and generate a hydrate-containing sediment;
the consolidation platform (31) is driven to slide along the upper supporting part by a first power mechanism, so that the pressurizing plate (32) is driven to linearly move in the kettle body (11), and vertical pressure is applied to hydrate-containing sediments;
the second power mechanism drives the injection platform (41) to slide along the upper supporting part, so as to drive the probe rod (42) to move linearly in the kettle body (11), and the probe is injected into the hydrate-containing sediment.
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| CN201910999674.XA CN110595893A (en) | 2019-10-21 | 2019-10-21 | Hydrate-containing sediment consolidation static exploration penetration simulation device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899727A (en) * | 2021-09-18 | 2022-01-07 | 中山大学 | Device and method for detecting vertical change of concentration of target object in sediment pore water |
| CN114965959A (en) * | 2022-05-26 | 2022-08-30 | 大连理工大学宁波研究院 | Static sounding calibration tank device for pressure-maintaining sediment online detection |
| CN115639079A (en) * | 2022-11-04 | 2023-01-24 | 湖北顶华工程勘察设计有限公司 | Static sounding test system and method for restoring soil body field state indoors |
-
2019
- 2019-10-21 CN CN201910999674.XA patent/CN110595893A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899727A (en) * | 2021-09-18 | 2022-01-07 | 中山大学 | Device and method for detecting vertical change of concentration of target object in sediment pore water |
| CN114965959A (en) * | 2022-05-26 | 2022-08-30 | 大连理工大学宁波研究院 | Static sounding calibration tank device for pressure-maintaining sediment online detection |
| CN115639079A (en) * | 2022-11-04 | 2023-01-24 | 湖北顶华工程勘察设计有限公司 | Static sounding test system and method for restoring soil body field state indoors |
| CN115639079B (en) * | 2022-11-04 | 2023-10-20 | 湖北顶华工程勘察设计有限公司 | Static cone penetration test system and method for restoring soil body site state indoors |
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Application publication date: 20191220 |