CN108445189B - Device and method for simulating static detection parameters of hydrate-containing sediment engineering - Google Patents
Device and method for simulating static detection parameters of hydrate-containing sediment engineering Download PDFInfo
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Abstract
The invention belongs to the field of marine natural gas hydrate exploitation, and particularly relates to a hydrate sediment engineering static detection parameter simulation device and method. The simulation device is a device capable of carrying out reservoir engineering static detection parameter evaluation indoors through simulation experiments, can provide basic data support for building hydrate deposit engineering parameter calculation models under different reservoir conditions, and provides basis for building a basic method special for hydrate deposit engineering static detection parameter evaluation.
Description
Technical Field
The invention belongs to the field of marine natural gas hydrate exploitation, and particularly relates to a device and a method for simulating a static detection parameter of hydrate sediment engineering.
Background
The natural gas hydrate is a cage compound formed by combining methane gas and water under a certain temperature and pressure condition. Under ideal condition 1m 3 Natural gas hydrate decomposition can release 164m 3 Natural gas (standard conditions) and therefore natural gas hydrates are considered to be unconventional energy sources with great energy potential, typically distributed in land permanent frozen earth zones or land border deep sea shallow sediments. In order to effectively develop and utilize natural gas hydrate, the natural gas hydrate is currently in CanadaMalik, alaska North slope, nankai Trough, china Muli basin, china south sea god fox sea area all developed certain natural gas hydrate test exploitation. A certain knowledge is obtained, and a certain experience basis is provided for the development and utilization of natural gas hydrate resources. Marine natural gas hydrate recovery presents a greater challenge than frozen earth with natural gas hydrate development.
One of the key challenges is: the water depth of the marine natural gas hydrate occurrence area is large, and the evaluation of the hydrate reservoir engineering parameters is difficult. The construction risk due to the evaluation error of engineering parameters is multiplied. These risks are mainly manifested in: the evaluation of the parameters of the overburden stratum of the hydrate reservoir depends on the field engineering geological survey, which has long time consumption and high cost, and undoubtedly increases the exploitation cost. And in the aspect of evaluating geological parameters of reservoir engineering, the method is still blank. The engineering geological parameters of the stratum covered on the test mining area are investigated by the first-time stratum before the test mining of the natural gas hydrate in the sea area in China, so that very precious data are obtained, and the basic technology for evaluating the engineering geological parameters in the deep sea is accumulated. However, the on-site engineering geological survey cannot cover the actual natural gas hydrate reservoir, and no relevant research report exists at home and abroad at present. The loss of the geological parameters of the hydrate reservoir engineering brings great difficulty to the evaluation of the stability of the reservoir in the later mining process, the simulation of the sand production process of the reservoir and the evaluation of the geological risks of the engineering.
Static sounding is the most important means for obtaining geological parameters of field engineering. In practice, however, field engineering static sounding has a strong "regional dependence". The engineering static sounding parameters obtained in the area A cannot be directly used for simulating and calculating the reservoir engineering geological parameters of the area B due to the influence of factors such as soil quality, pore penetration, soil components and the like. Therefore, even if engineering geological investigation aiming at the test mining area is carried out in the first sea area natural gas hydrate test mining in China, the parameters cannot be applied to the next test mining area at all.
For this reason, there are currently the following bottlenecks in the evaluation of the engineering static detection parameters of hydrate deposit, which need to be resolved: (1) The on-site engineering geological investigation is time-consuming and laborious, and a new engineering static detection parameter evaluation method capable of reducing the exploitation cost of the natural gas hydrate needs to be explored; (2) The on-site engineering geological survey does not work on natural gas hydrate reservoirs, the calculation of reservoir engineering parameters depends on an empirical formula, and the reliability is to be further checked; (3) The engineering static detection parameters in different areas have strong regional dependence and are not universal, and a basic method special for evaluating the engineering static detection parameters of the sediment containing the hydrate is required to be established.
Disclosure of Invention
The invention aims to provide a hydrate-containing sediment engineering static detection parameter simulation device, which is a device capable of carrying out reservoir engineering static detection parameter evaluation indoors through simulation experiments, can provide basic data support for building hydrate sediment engineering parameter calculation models under different reservoir conditions, and provides basis for building a basic method special for hydrate-containing sediment engineering static detection parameter evaluation.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the hydrate-containing sediment engineering static detection parameter simulation device comprises a hydrate reservoir simulation reaction kettle subsystem, an air supply subsystem, a cooling subsystem, a static touch detection subsystem, a monitoring subsystem and a data acquisition subsystem;
the hydrate reservoir simulation reaction kettle subsystem comprises a reaction kettle body, wherein an upper end cover and a lower end cover are respectively arranged at the upper end and the lower end of the reaction kettle body, an inner container is arranged in the reaction kettle body, the two ends of the inner container are respectively in sealing connection with the upper end cover and the lower end cover, a sealed annular space is formed between the inner wall of the reaction kettle body and the outer wall of the inner container, an air outlet and an air inlet are respectively arranged at the positions corresponding to the inner container on the upper end cover and the lower end cover, saturated sediments are filled in the inner container, and nitrogen is filled in the annular space; a cooling pipe is wound on the outer wall of the reaction kettle body;
the gas supply subsystem comprises a methane cylinder;
the cooling subsystem comprises a refrigerator and a heat exchanger, the refrigerator is used for circularly cooling a refrigerant in the heat exchanger, methane in the methane cylinder is cooled by the heat exchanger and then is introduced into the liner through the air inlet, and cooling liquid in the cooling pipe is circularly subjected to heat exchange with the heat exchanger;
the static touch subsystem comprises a penetration module and a measuring module, wherein the penetration module comprises a penetration motor, a counter-force support frame is arranged on the upper end cover, and the penetration motor is arranged on the counter-force support frame; the measuring module comprises a static sounding probe, a stay wire encoder and a data acquisition instrument, wherein a through hole is formed in the upper end cover and corresponds to the position of the inner container, a probe rod is arranged in the through hole, can slide up and down along the through hole and is in sealing fit with the through hole, the static sounding probe is arranged at the lower end of the probe rod, the upper end of the probe rod is connected with a penetrating motor, and the penetrating motor can drive the probe rod to move up and down; the body of the stay wire encoder is arranged on the penetration motor, and the metal wire of the stay wire encoder is connected to the probe rod; the static cone penetration test probes are electrically connected with the data acquisition instrument;
the monitoring subsystem comprises a monitoring module, a temperature sensor, an air pressure sensor and a flow sensor, wherein the temperature sensor is respectively arranged at the outlet of the refrigerant of the heat exchanger, the outlet of the methane gas heat exchanger, the upper end cover and the lower end cover of the reaction kettle body and the inside of the reaction kettle body; the air pressure sensor is arranged at the outlet of the methane gas heat exchanger and in a sealed annular space formed between the inner wall of the reaction kettle body and the outer wall of the inner container; the flow sensor is arranged at the outlet of the methane cylinder; the temperature sensor, the air pressure sensor and the flow sensor are respectively and electrically connected with the monitoring module;
the data acquisition subsystem comprises a data acquisition computer, and the data acquisition computer is electrically connected with the data acquisition instrument, the monitoring module and the stay wire encoder respectively.
Further, the cooling pipe is a copper pipe, the copper pipe is welded with the outer wall of the reaction kettle body locally, the copper pipe is covered with a heat preservation layer, and the heat preservation layer is covered with an outer protection layer.
Further, an upper end cover opening mechanism is connected to the upper end cover and is an electric ratchet plate, and the electric ratchet plate is arranged on the counter-force supporting frame.
Further, a safety valve is arranged on the upper end cover at the position corresponding to the annular space.
Further, the monitoring subsystem also comprises a circuit monitoring module, wherein the circuit monitoring module is used for monitoring the power supply states of the sensors, the data acquisition subsystem and the measuring module.
Further, three layers of sealing rings are arranged in the through holes of the upper end cover and matched with the probe rod.
Further, the penetration motor comprises a torque motor and a planetary roller screw, one end of the planetary roller screw is connected with a rotating shaft of the torque motor, the other end of the planetary roller screw is connected with a motion pressing block, and the upper end of the probe rod is connected with the motion pressing block.
Further, the hydrate reservoir simulation reaction kettle subsystem further comprises a turnover bracket for turning over the reaction kettle.
Another object of the present invention is to provide a method for simulating a hydrate-containing sediment engineering static detection parameter, comprising:
s1, vacuum saturation of a static cone penetration probe: a static cone penetration test probe which is actually needed to be used is inserted into a probe vacuum saturator to be vacuumized, and distilled water is saturated in a pore pressure measuring hole;
s2, in-situ synthesis of saturated water sediment: installing a hydrate reservoir simulation reaction kettle subsystem, filling saturated water sediment into the liner, reserving a space of 20-30 mm between the saturated water sediment and the upper end cover, slowly injecting methane into the reaction kettle, cooling, simulating the upward leakage process of gas and generating a sediment containing hydrate;
s3, carrying out static sounding simulation of the hydrate-containing sediment: connecting a static sounding subsystem, setting the penetration rate of a static sounding probe, starting a penetration motor, gradually pressing the static sounding probe into hydrate sediment, recording probe cone end resistance, side friction resistance, pore pressure, resistivity and video image data in the process in real time, and recording the penetration depth of the probe in real time through a pull wire encoder; stopping the penetration when the probe penetrates to a depth of 2cm from the lower end cover of the reaction kettle, reversely penetrating into the motor, and lifting the static cone penetration probe;
s4, estimating the longitudinal distribution rules of the non-drainage shear strength, the permeability coefficient and the stress path of the sediment containing the hydrate according to cone end resistance, side friction resistance and pore pressure, calculating the saturation of the hydrate in the layer according to the resistivity, establishing the change rules of cone end resistance, side friction resistance and pore water pressure along with the saturation of the hydrate, and further establishing the change curves of the non-drainage shear strength, the permeability coefficient and the stress path along with the saturation of the hydrate; and identifying the destructive form of the hydrate deposit in the static cone penetration process by utilizing the video image data in the static cone penetration process.
The simulation device for the hydrate-containing sediment engineering static detection parameters is a device capable of carrying out reservoir engineering static detection parameter evaluation indoors through simulation experiments, can provide basic data support for building hydrate sediment engineering parameter calculation models under different reservoir conditions, and provides basis for building a basic method special for hydrate-containing sediment engineering static detection parameter evaluation. In addition to this, the device of the invention has the following effects:
(1) From the perspective that the indoor simulation experiment is consistent with the on-site deep sea on-site construction, the scheme adopts the static sounding probe to obtain 5 test parameters at one time: cone tip resistance, side friction resistance, pore water pressure, resistivity and pore photography. Not only improves the experimental efficiency, but also has very important significance for simultaneously obtaining the non-uniformity of the longitudinal mechanical parameters and the non-uniformity of the saturation of the hydrate-containing sediment. The measured cone tip resistance, side friction resistance and pore pressure can be calculated according to the engineering strength parameter of 1:1 of site construction, and the measured resistivity parameter can acquire the saturation longitudinal non-uniformity characteristic of the actual hydrate-containing sediment, so that the corresponding research of the hydrate-containing sediment engineering strength parameter and the reservoir saturation non-uniformity can be realized;
(2) The device adopts the main advantages of planet post lead screw: the planetary roller screw has a similar structure to the ball screw, and is characterized in that the planetary roller screw load transmission element is a threaded roller and is in typical line contact; and the ball screw load transmission element is a ball, which is in point contact. The planetary column screw used by the device has a plurality of contact points to support the load. Because of uncertainty of distribution of the synthetic natural gas hydrate in the test, uncertainty of soil layering is caused, local strength can be greatly different, and therefore a line contact mechanism with good shock resistance is required to be selected. When the static probe cone is in a soil layer exceeding the upper safety limit or the probe cone is pointed to the lower end cover of the reaction kettle due to operation delay and the like, the motor can be stopped in a protective way, the propulsion is stopped, and the probe is prevented from being damaged;
(3) The hydrate-containing sediment engineering static detection parameter simulation device can completely simulate the temperature and pressure environment where the actual submarine hydrate-containing sediment is located, and can generate the natural gas-containing hydrate sediment in the sediment by means of the pressure of a methane gas source. The cooperation of this function with a static cone penetration device is not involved in all devices at present.
(4) In order to prevent the influence of external temperature on the whole temperature of the reaction kettle, a gas heat exchanger synchronous with gas temperature control is adopted to cool the glycol, and copper tubes wound around the periphery of the reaction kettle are utilized to control the whole temperature of the reaction kettle. The simulation of the actual reservoir temperature conditions is ensured under double temperature control.
Drawings
FIG. 1 is a schematic view of a portion of the structure of the device of the present invention;
FIG. 2 is a schematic diagram of the modular connection of the measurement section of the present invention;
FIG. 3 is a schematic diagram of the connection of the refrigeration unit of the present invention;
in the above figures: 1-a reaction kettle body; 2-an inner container; 3-an upper end cap; 4-a lower end cover; 5-cooling pipes; 6-penetrating into the motor; 7-a counterforce support frame; 8-a static cone penetration probe; 9-a probe rod; 10-stay wire encoder; 11-an electric ratchet plate; 12-turning over the bracket; 13-moving the pressing block.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The invention relates to a hydrate-containing sediment engineering static detection parameter simulation device which mainly comprises 6 parts, wherein the parts are as follows: the system comprises a hydrate reservoir simulation reaction kettle subsystem, an air supply subsystem, a cooling subsystem, a static touch probe subsystem, a monitoring subsystem and a data acquisition subsystem.
The hydrate reservoir simulation reaction kettle subsystem comprises a reaction kettle body 1, wherein the reaction kettle comprises a reaction kettle body 1 made of titanium alloy, an upper end cover 3 and a lower end cover 4 are respectively arranged at the upper end and the lower end of the reaction kettle body 1, an inner container 2 is arranged in the reaction kettle body 1, the two ends of the inner container 2 are respectively in sealing connection with the upper end cover 3 and the lower end cover 4, a sealing annular space is formed between the inner wall of the reaction kettle body 1 and the outer wall of the inner container 2, an air outlet and an air inlet are respectively arranged at positions corresponding to the inner container 2 on the upper end cover 3 and the lower end cover 4, saturated sediments are filled in the inner container 2, and nitrogen is filled in the annular space; the outer wall of the reaction kettle body 1 is wound with a cooling pipe 5, and the temperature control fluid in the pipe is glycol. The cooling pipe 5 is a copper pipe, and the copper pipe is locally welded with the outer wall of the reaction kettle body 1, so that the pipeline is in close contact with the reaction kettle, and the heat conductivity coefficient is increased. The copper pipe is covered with an insulating layer for stabilizing the temperature in the kettle, the insulating layer mainly comprises rock wool, has the characteristics of flame retardance and heat preservation, the thickness of the rock wool of the insulating layer is generally 50mm, the insulating layer is covered with an outer protective layer, the outer protective layer is made of a thin stainless steel plate and is wrapped on the outer side of the rock wool, and the copper pipe has the advantages of being attractive in appearance, corrosion-resistant, fireproof and the like. In addition, an upper end cover 3 opening mechanism is connected to the upper end cover 3, the upper end cover 3 opening mechanism is an electric ratchet plate 11, and the electric ratchet plate 11 is arranged on the counter-force supporting frame 7. The electric ratchet plate 11 can automatically grasp the upper end cover 3 of the reaction kettle, and pull force is applied through the counter-force support frame 7 to open the upper end cover 3. The hydrate reservoir simulation reaction kettle subsystem further comprises a turnover bracket 12 for turning over the reaction kettle, so that sediment inside the reaction kettle can be dumped conveniently when the test is finished.
The gas supply subsystem comprises a methane cylinder for containing methane gas.
The cooling subsystem comprises a refrigerator and a heat exchanger, wherein the refrigerator is used for circularly cooling a refrigerant in the heat exchanger, the heat exchanger is a gas heat exchanger, and the refrigerator is a low-temperature water cooling unit. Methane in the methane cylinder is cooled by the heat exchanger and then is introduced into the liner 2 through the air inlet. The cooling liquid in the cooling pipe 5 circulates and exchanges heat with the heat exchanger.
The monitoring subsystem comprises a monitoring module, a temperature sensor, a barometric pressure sensor, a flow sensor and a circuit monitoring module.
The temperature sensor is arranged at the outlet of the refrigerant of the heat exchanger and is used for measuring the temperature of the refrigerant flowing out of the heat exchanger; the device is arranged at the outlet of the methane gas heat exchanger and is used for measuring the temperature of methane gas after heat exchange; the temperature sensor is further disposed at the positions of the upper end cover 3 and the lower end cover 4 of the reaction kettle body 1 and inside the reaction kettle body 1, and two temperature sensors are disposed at two different positions inside the reaction kettle body 1 in general, and detect the temperatures of the positions of the upper end cover 3 and the lower end cover 44 inside the reaction kettle body 1.
The air pressure sensor is arranged in a sealed annular space formed between the inner wall of the reaction kettle body 1 and the outer wall of the liner 2 and used for detecting the air pressure in the annular space, and can be arranged on the inner side of the upper end cover 3 when in specific arrangement; the safety valve is arranged on the upper end cover 3 at the position corresponding to the annular space, when the air pressure sensor detects that the air pressure in the annular space is abnormally increased to a specified value (30 MPa), the safety valve is automatically opened, then the full quantity is discharged, and when the pressure is reduced to the specified value, the safety valve is automatically closed, so that the safe operation of the reaction kettle is ensured; the air pressure sensor is also arranged at the outlet of the methane gas heat exchanger and is used for detecting the pressure of methane gas entering the inner container 2.
The flow detection sensor is arranged at the outlet of the methane cylinder and is used for detecting the amount of methane gas entering the liner 2.
The circuit monitoring module is used for monitoring the power supply state of each sensor, the data acquisition subsystem and the measuring module.
The temperature sensing sensor, the pressure detecting sensor, the flow detecting sensor and the circuit monitoring module are respectively and electrically connected with the monitoring module.
The static touch probe system comprises a penetration module and a measurement module, wherein the penetration module comprises a penetration motor 6, a counter-force support frame 7 is arranged on the upper end cover 3, and the penetration motor 6 is arranged on the counter-force support frame 7; the penetrating motor 6 performs the actions of pushing and recovering the probe rod 9 into the reaction kettle, and the counter-force support frame 7 is responsible for relatively fixing the penetrating motor 6 and the reaction kettle. The penetration motor 6 is formed by matching a torque motor with a planetary roller screw, one end of the planetary roller screw is connected with a rotating shaft of the torque motor, and the other end of the planetary roller screw is connected with a motion pressing block 13. The torque motor has winding characteristics, can realize constant tension rotation, and the constant tension rotation can effectively realize the protection of the static cone penetration probe 8. The planetary roller screw allows for a rapid release of load through numerous points of contact, thereby enabling higher impact resistance. Parameters of the penetration motor 6: the penetration force is 5kN at 10MPa, and the penetration power is 750W.
The measuring module comprises a static sounding probe 8, a stay wire encoder 10 and a data acquisition instrument, a through hole is formed in the upper end cover 3 and corresponds to the position of the liner 2, a probe rod 9 is arranged in the through hole, the probe rod 9 can slide up and down along the through hole and is in sealing fit with the through hole, a three-layer sealing ring is designed at the position where the probe rod 9 is matched, and when the penetrating action is executed, the integral tightness of the reaction kettle is ensured, and the pressure drop caused by leakage is prevented. The static cone penetration probe 8 is arranged at the lower end of the probe rod 9, the upper end of the probe rod 9 is connected with the penetration motor 6, the penetration motor 6 can drive the probe rod 9 to move up and down, in particular, the lower end of the planetary roller screw is connected with the motion pressing block 13, and the upper end of the probe rod 9 is connected with the motion pressing block 13. The static cone penetration probe 8 is a very mature probe in the prior art, and in the invention, the static cone penetration probe 8 has a pressure resistance of 30MPa, and can simultaneously measure the following engineering static cone penetration parameters in the process of pressing the static cone penetration probe into a hydrate sediment: cone tip resistance (measuring range 0-10 MPa, test accuracy 0.5%), side friction resistance (0-1 MPa, test accuracy 0.5%), pore water pressure (0-20 MPa, test accuracy 0.5%), resistivity (measuring range 0-5000 Ω m, test accuracy 0.5%) and image of penetration path (100W pixel). The probe rod 9 is made of a duplex stainless steel tube with the surface subjected to special treatment, has good tightness with the reaction kettle, and can keep good sealing effect under the pressure state of 30 MPa.
The body of the stay wire encoder 10 is arranged on the penetration motor 6, and the metal wire of the stay wire encoder 10 is connected to the probe rod 9; when the static sounding probe 8 is pressed into the reaction kettle under the action of the probe rod 9, the metal wire of the stay wire encoder 10 is driven to synchronously move, so that the penetration depth of the probe is obtained, and the penetration speed of the probe can be indirectly obtained. The code depth of the stay wire is the basis of automatic recording of static sounding and is also the basis for adjusting the penetration speed. And the static cone penetration probes 8 are electrically connected with a data acquisition instrument.
The data acquisition subsystem comprises a data acquisition computer, and the data acquisition computer is respectively and electrically connected with the data acquisition instrument and the monitoring module. The data acquisition computer is provided with static cone penetration acquisition software, so that the acquisition of parameters such as cone tip resistance, side friction resistance, pore pressure, resistivity value and the like in the static cone penetration process can be monitored at a main interface, and the parameters can be automatically recorded in the background. The acquired data can be exported, can be acquired in real time, can be displayed in real time on a software interface, and provides a manual correction interface.
Example 2
Corresponding to the hydrate deposit engineering static detection parameter simulation device in example 1, example 2 provides a hydrate deposit engineering static detection parameter simulation method, which includes:
s1, vacuum saturation of a static cone penetration probe 8; the method comprises the specific steps of taking a static cone penetration probe 8 which is actually needed to be used, inserting the probe into a vacuum saturator for vacuumizing, and saturating distilled water in a pore pressure measuring hole.
The method mainly comprises the steps of carrying out vacuum degassing on a pore water pressure conduction cabin of a pore pressure touch probe, and filling and saturating with pressure-guiding liquid, so that the influence of air on pore water pressure detection is reduced. The probe vacuum saturator comprises the following specific parameters: -0.1MPa; adapting probe type: 2cm 2 、5cm 2 、10cm 2 、15cm 2 A hole pressure probe; rated power: 80W.
S2, in-situ synthesis of saturated water sediment: installing a hydrate reservoir simulation reaction kettle subsystem, filling saturated water sediment into the liner 2, reserving a space of 20-30 mm between the saturated water sediment and the upper end cover 3, slowly injecting methane into the reaction kettle, cooling, simulating the upward leakage process of gas and generating hydrate-containing sediment;
in the operation step, the height of the saturated water sediment in the reaction kettle is ensured to be smaller than the actual effective height of the reaction kettle, and the space of 20-30 mm is ensured to exist at the upper part of the saturated water sediment all the time, wherein the existence of the space is crucial for simulating the real submarine hydrate-containing sediment environment: the saturated water sediment can discharge a part of water in the process of upward leakage of the gas, the part of water is deposited in the space between the sediment and the inner wall of the upper end cover 3 of the reaction kettle, and the redundant water is discharged out of the reaction kettle. Therefore, the stress applied to the upper end of the sediment by the part of water film can simulate the pressure of the actual sea water to the sediment at the bottom, and the defect that the stress application condition of the sea water to the sediment cannot be accurately simulated when the end face of the sediment is directly pressurized by adopting hard metal in the conventional mechanical experiment is overcome.
S3, carrying out static sounding simulation of the hydrate-containing sediment: the static cone penetration test system is connected with a static cone penetration test subsystem, the penetration rate of the static cone penetration test probe 8 is set to be 2mm/s generally, the penetration motor 6 is started, the static cone penetration test probe 8 is gradually pressed into hydrate sediment, probe cone end resistance, side friction resistance, pore pressure, resistivity and video image data 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 10. When the probe penetration depth is 42cm away from the lower end cover of the reaction kettle, stopping penetration, reversely penetrating the motor 6, and lifting the static cone penetration probe 8.
S4, estimating longitudinal distribution rules of parameters such as non-drainage shear strength, permeability coefficient, stress path and the like of the sediment containing the hydrate according to cone end resistance, side friction resistance and pore pressure, calculating the saturation of the hydrate in the layer where the sediment containing the hydrate is located by using the measured resistivity, establishing the change rule of engineering static sounding data such as cone end resistance, side friction resistance, pore water pressure and the like along with the saturation of the hydrate, and further establishing the change curve of engineering parameters such as non-drainage shear strength, permeability coefficient, stress path and the like along with the saturation of the hydrate. And identifying the destructive form of the hydrate deposit in the static cone penetration process by utilizing the video image data in the static cone penetration process.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (7)
1. The hydrate-containing sediment engineering static detection parameter simulation device is characterized by comprising a hydrate reservoir simulation reaction kettle subsystem, an air supply subsystem, a cooling subsystem, a static touch detection subsystem, a monitoring subsystem and a data acquisition subsystem;
the hydrate reservoir simulation reaction kettle subsystem comprises a reaction kettle body, wherein an upper end cover and a lower end cover are respectively arranged at the upper end and the lower end of the reaction kettle body, an inner container is arranged in the reaction kettle body, the two ends of the inner container are respectively in sealing connection with the upper end cover and the lower end cover, a sealed annular space is formed between the inner wall of the reaction kettle body and the outer wall of the inner container, an air outlet and an air inlet are respectively arranged at the positions corresponding to the inner container on the upper end cover and the lower end cover, saturated sediments are filled in the inner container, and nitrogen is filled in the annular space; a cooling pipe is wound on the outer wall of the reaction kettle body;
the gas supply subsystem comprises a methane cylinder;
the cooling subsystem comprises a refrigerator and a heat exchanger, the refrigerator is used for circularly cooling a refrigerant in the heat exchanger, methane in the methane cylinder is cooled by the heat exchanger and then is introduced into the liner through the air inlet, and cooling liquid in the cooling pipe is circularly subjected to heat exchange with the heat exchanger;
the static touch subsystem comprises a penetration module and a measuring module, wherein the penetration module comprises a penetration motor, a counter-force support frame is arranged on the upper end cover, and the penetration motor is arranged on the counter-force support frame; the measuring module comprises a static sounding probe, a stay wire encoder and a data acquisition instrument, wherein a through hole is formed in the upper end cover and corresponds to the position of the inner container, a probe rod is arranged in the through hole, can slide up and down along the through hole and is in sealing fit with the through hole, the static sounding probe is arranged at the lower end of the probe rod, the upper end of the probe rod is connected with a penetrating motor, and the penetrating motor can drive the probe rod to move up and down; the body of the stay wire encoder is arranged on the penetration motor, and the metal wire of the stay wire encoder is connected to the probe rod; the static cone penetration test probes are electrically connected with the data acquisition instrument;
the monitoring subsystem comprises a monitoring module, a temperature sensor, an air pressure sensor and a flow sensor, wherein the temperature sensor is respectively arranged at the outlet of the refrigerant of the heat exchanger, the outlet of the methane gas heat exchanger, the upper end cover and the lower end cover of the reaction kettle body and the inside of the reaction kettle body; the air pressure sensor is arranged at the outlet of the methane gas heat exchanger and in a sealed annular space formed between the inner wall of the reaction kettle body and the outer wall of the inner container; the flow sensor is arranged at the outlet of the methane cylinder; the temperature sensor, the air pressure sensor and the flow sensor are respectively and electrically connected with the monitoring module;
the data acquisition subsystem comprises a data acquisition computer which is electrically connected with the data acquisition instrument, the monitoring module and the stay wire encoder respectively;
the monitoring subsystem further comprises a circuit monitoring module, wherein the circuit monitoring module is used for monitoring the power supply states of the sensors, the data acquisition subsystem and the measuring module;
and a safety valve is arranged at the position corresponding to the annular space on the upper end cover.
2. The hydrate-containing sediment engineering static detection parameter simulation device according to claim 1, wherein: the cooling pipe is a copper pipe, the copper pipe is partially welded with the outer wall of the reaction kettle body, the copper pipe is covered with a heat preservation layer, and the heat preservation layer is covered with an outer protection layer.
3. The hydrate-containing sediment engineering static detection parameter simulation device according to claim 1, wherein: the upper end cover is connected with an upper end cover opening mechanism, the upper end cover opening mechanism is an electric ratchet plate, and the electric ratchet plate is arranged on the counter-force supporting frame.
4. The hydrate-containing sediment engineering static detection parameter simulation device according to claim 1, wherein: and three layers of sealing rings are arranged in the through holes of the upper end cover and at the matching positions of the upper end cover and the probe rod.
5. The hydrate-containing sediment engineering static detection parameter simulation device according to claim 1, wherein: the penetration motor comprises a torque motor and a planetary roller screw, one end of the planetary roller screw is connected with a rotating shaft of the torque motor, the other end of the planetary roller screw is connected with a motion pressing block, and the upper end of the probe rod is connected with the motion pressing block.
6. The hydrate-containing sediment engineering static detection parameter simulation device according to claim 1, wherein: the hydrate reservoir simulation reaction kettle subsystem further comprises a turnover bracket for turning over the reaction kettle.
7. A hydrate deposit engineering static detection parameter simulation method using the hydrate deposit engineering static detection parameter simulation device according to any one of claims 1 to 6, characterized by comprising:
s1, vacuum saturation of a static cone penetration probe: a static cone penetration test probe which is actually needed to be used is inserted into a probe vacuum saturator to be vacuumized, and distilled water is saturated in a pore pressure measuring hole;
s2, in-situ synthesis of saturated water sediment: installing a hydrate reservoir simulation reaction kettle subsystem, filling saturated water sediment into the liner, reserving a space of 20-30 mm between the saturated water sediment and the upper end cover, slowly injecting methane into the reaction kettle, cooling, simulating the upward leakage process of gas and generating a sediment containing hydrate;
s3, carrying out static sounding simulation of the hydrate-containing sediment: connecting a static sounding subsystem, setting the penetration rate of a static sounding probe, starting a penetration motor, gradually pressing the static sounding probe into hydrate sediment, recording probe cone end resistance, side friction resistance, pore pressure, resistivity and video image data in the process in real time, and recording the penetration depth of the probe in real time through a pull wire encoder; stopping the penetration when the probe penetrates to a depth of 2cm from the lower end cover of the reaction kettle, reversely penetrating into the motor, and lifting the static cone penetration probe;
s4, estimating the longitudinal distribution rules of the non-drainage shear strength, the permeability coefficient and the stress path of the sediment containing the hydrate according to cone end resistance, side friction resistance and pore pressure, calculating the saturation of the hydrate in the layer according to the resistivity, establishing the change rules of cone end resistance, side friction resistance and pore water pressure along with the saturation of the hydrate, and further establishing the change curves of the non-drainage shear strength, the permeability coefficient and the stress path along with the saturation of the hydrate; and identifying the destructive form of the hydrate deposit in the static cone penetration process by utilizing the video image data in the static cone penetration process.
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| CN109827829B (en) * | 2019-04-09 | 2021-04-20 | 大连理工大学 | Rotary type hydrate sediment sample preparation and mechanical property test device |
| CN110954673B (en) * | 2019-12-02 | 2021-10-22 | 中国海洋大学 | Static sounding indoor simulation test method |
| CN110952521A (en) * | 2019-12-26 | 2020-04-03 | 国家***南海标准计量中心 | Detection equipment and method for ocean static penetrometer |
| CN113776925B (en) * | 2021-09-26 | 2022-05-27 | 中国科学院武汉岩土力学研究所 | Self-drilling type side pressure simulation test device and method for natural gas hydrate-containing stratum |
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