CN114199924A - Oil-rich coal in-situ pyrolysis process simulation test device and method - Google Patents
Oil-rich coal in-situ pyrolysis process simulation test device and method Download PDFInfo
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- CN114199924A CN114199924A CN202210038660.3A CN202210038660A CN114199924A CN 114199924 A CN114199924 A CN 114199924A CN 202210038660 A CN202210038660 A CN 202210038660A CN 114199924 A CN114199924 A CN 114199924A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
Abstract
The invention discloses a similar simulation test device for an in-situ pyrolysis process of oil-rich coal, which comprises a similar simulation system, a heating temperature control system and a data acquisition system, wherein the similar simulation system comprises a simulation test box, the heating temperature control system comprises a heating panel and a temperature control device, the heating panel is arranged below the simulation test box and is in contact with a bottom plate of the simulation test box for transmitting heat to a coal stratum similar model built in the simulation test box through the bottom plate of the simulation test box, and the data acquisition system is connected with the simulation test box for acquiring test data and samples. The invention also discloses a simulation test method for the in-situ pyrolysis process of the oil-rich coal by using the device. According to the invention, the heating panel arranged below the simulation test box is used for heating the coal-rock stratum similar model arranged in the simulation test box, so that the original state of the rock stratum is kept to the greatest extent, and the research on temperature fields and stress fields of various rock strata in the in-situ pyrolysis process of the oil-rich coal is facilitated.
Description
Technical Field
The invention belongs to the technical field of in-situ pyrolysis of rich coal, and particularly relates to a device and a method for a similar simulation test of the in-situ pyrolysis process of the rich coal.
Background
The oil-rich coal is a special coal resource and can be converted into oil gas resources which are in short supply by pyrolysis. Along with the development of underground in-situ mining, the rich-oil coal in-situ pyrolysis combining underground coal gasification and oil shale in-situ mining can greatly reduce the mining cost of the rich-oil coal and improve the energy utilization efficiency, and meanwhile, the method has the advantages of small environmental pollution, strong adaptability of mining depth and the like.
However, the research on the in-situ pyrolysis of the oil-rich coal is in the initial stage, and mainly researches on products after the pyrolysis of the oil-rich coal, a temperature field, a stress field and a fracture zone in the corresponding pyrolysis process by means of laboratory analysis, numerical simulation, theoretical calculation and the like. Although the established model can predict the change of the physical field in the in-situ pyrolysis process of the oil-rich coal, the reliability of the model cannot be verified. The in-situ pyrolysis of the oil-rich coal is carried out underground, the process is complex, and the migration diffusion of pollutants generated by pyrolysis, the change process of a temperature field and a stress field need better research methods and systems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a similar simulation test device for the in-situ pyrolysis process of oil-rich coal, which heats a coal-rock stratum similar model arranged in a simulation test box through a heating panel arranged below the simulation test box, maintains the original state of the rock stratum to the maximum extent and is beneficial to the research of temperature fields and stress fields of various rock strata in the in-situ pyrolysis process of the oil-rich coal.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a similar analogue test device of rich oil coal normal position pyrolysis process which characterized in that includes: the system comprises a similar simulation system, a heating temperature control system and a data acquisition system;
the simulation system comprises a simulation test box for building a coal and rock stratum simulation model in the simulation test box;
the heating temperature control system comprises a heating panel and a temperature control device, the temperature control device is connected with the heating panel and is used for controlling the heating panel to work, and the heating panel is arranged below the simulation test box and is in contact with a bottom plate of the simulation test box and is used for transferring heat to a coal rock stratum similar model built in the simulation test box through the bottom plate of the simulation test box;
the data acquisition system is connected with the simulation test box and used for acquiring test data and samples, and the data acquisition system is connected with the coal and rock stratum similar model in the simulation test box and used for acquiring temperature and pressure information in the coal and rock stratum similar model.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that the similar simulation system further comprises a nitrogen source capable of providing nitrogen, the nitrogen source is communicated with the simulation test box through a pipeline, and a pressure reducing valve is arranged on the pipeline connecting the nitrogen source and the simulation test box.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that the similar simulation system further comprises an automatic water inlet tank, the automatic water inlet tank is communicated with the simulation test box through a pipeline, and a water inlet regulating valve is arranged on the pipeline connecting the automatic water inlet tank and the simulation test box.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that the data acquisition system comprises a water sample collection device and a pyrolysis oil collection device;
the water sample collecting device is communicated with the simulation test box through a pipeline and is used for collecting water samples in aquifers in the rock stratum similar model in the in-situ pyrolysis process of the oil-rich coal, and a water outlet valve is arranged on the pipeline connecting the water sample collecting device with the simulation test box;
the pyrolysis oil collecting device is communicated with the simulation test box through a pipeline and is used for collecting pyrolysis oil generated in the in-situ pyrolysis process of the oil-rich coal.
Foretell rich oily coal normal position pyrolysis process analogue simulation test device, its characterized in that, pyrolysis oil collection device includes condenser, pyrolysis oil receiving flask and blast pipe, the condenser sets up in the outside of pyrolysis oil receiving flask and is used for cooling the pyrolysis oil that decomposes from the coal seam, the one end and the pyrolysis oil receiving flask of blast pipe communicate mutually, be provided with discharge valve on the blast pipe.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that the simulation test box comprises a front side panel and a simulation test box main body, the front side panel is made of quartz glass and is detachably mounted on the simulation test box main body, and the front side panel is connected with the simulation test box main body in a sealing mode.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that a coal and rock stratum similar model built in the simulation test box comprises a simulated coal bed, an overburden layer I, a rock stratum II, a rock stratum III, a water-bearing layer and a surface soil layer, and the simulated coal bed, the overburden layer I, the rock stratum II, the rock stratum III, the water-bearing layer and the surface soil layer are sequentially arranged from bottom to top according to a similar principle;
an air inlet is formed in the side wall of the left side of the simulation test box main body, and the position of the air inlet is over against the middle of a simulation coal bed in the coal rock layer similar model;
a water outlet hole is further formed in the side wall of the left side of the simulation test box main body, and the position of the water outlet hole is over against the bottom of a water-bearing layer in the coal rock layer similar model;
a water inlet hole is formed in the side wall of the right side of the simulation test box main body, and the position of the water inlet hole is over against the top of the aquifer in the coal rock stratum similar model;
and the side wall on the right side of the simulation test box main body is also provided with an air outlet hole, and the position of the air outlet hole is over against the bottom of the simulated coal bed in the coal rock layer similar model.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that a sampling hole is formed in the side wall of the rear side of the simulation test box main body;
the number of the sampling holes is four, and the sampling holes are respectively a first sampling hole, a second sampling hole, a third sampling hole and a fourth sampling hole, wherein the position of the first sampling hole is over against the middle of an overlying strata I in the coal strata similar model, the position of the second sampling hole is over against the middle of a strata II in the coal strata similar model, the position of the third sampling hole is over against the middle of a strata III in the coal strata similar model, and the position of the fourth sampling hole is over against the middle of a water-bearing layer in the coal strata similar model.
The similar simulation test device for the in-situ pyrolysis process of the oil-rich coal is characterized in that the data acquisition system further comprises a sensor, a data acquisition device and a processor for processing data, wherein the sensor is arranged in the coal rock layer similar model and is used for acquiring temperature and pressure data information inside the coal rock layer similar model, the data acquisition device is connected with the sensor and is used for collecting the data information acquired by the sensor, and the data acquisition device is connected with the processor and is used for transmitting the acquired data to the processor;
the sensors comprise four groups of temperature sensors and four groups of pressure sensors, wherein the four groups of temperature sensors are respectively a first temperature sensor group, a second temperature sensor group, a third temperature sensor group and a fourth temperature sensor group;
the four groups of pressure sensors are respectively a first pressure sensor group, a second pressure sensor group, a third pressure sensor group and a fourth pressure sensor group;
the first temperature sensor group and the first pressure sensor group are uniformly distributed at the top of a simulated coal seam in the coal rock stratum similar model;
the second temperature sensor group and the second pressure sensor group are uniformly distributed in the middle of a first overburden layer in the coal-rock layer similar model;
the third temperature sensor group and the third pressure sensor group are both arranged in the middle of a second rock stratum in the coal-rock stratum similar model;
and the fourth temperature sensor group and the fourth pressure sensor group are both arranged in the middle of a third rock stratum in the coal rock stratum similar model.
Correspondingly, the invention also provides a method for carrying out the similar simulation test of the in-situ pyrolysis process of the oil-rich coal by using the similar simulation test device of the in-situ pyrolysis process of the oil-rich coal, which is characterized by comprising the following steps of: the method comprises the following steps:
step one, building a coal rock stratum similar model in a simulation test box;
the coal and rock stratum similar model selects a geometric similarity ratio of 1: 200, selecting river sand, gypsum and white powder as model filling materials according to mechanical properties, determining the proportions of the river sand, the gypsum and the white powder in the overburden rock layer I, the rock layer II, the rock layer III, the aquifer and the topsoil layer according to the stress-strength similarity ratio and the geometric similarity ratio, and calculating materials required by each rock layer according to the thickness of each rock layer, the volume weight of similar materials and the size of the model;
step two, arranging a sensor;
in the process of building a coal and rock stratum similar model, a first temperature sensor group and a first pressure sensor group are arranged at the top of a simulated coal seam, a second temperature sensor group and a second pressure sensor group are arranged in the middle of a first overlying rock stratum, a third temperature sensor group and a third pressure sensor group are arranged in the middle of a second rock stratum, and a fourth temperature sensor group and a fourth pressure sensor group are arranged in the middle of a third rock stratum;
step three, air-drying the coal rock stratum similar model;
removing the front side panel, and allowing the coal rock layer to be air-dried like the model naturally;
step four, sealing the simulation test box;
after the coal rock stratum similar model is naturally air-dried, installing a front side panel, and checking whether the simulation test box is sealed;
step five, gas supply and water injection;
nitrogen is supplied into the simulation test box by utilizing the air inlet hole so as to ensure that the coal does not generate spontaneous combustion in the pyrolysis process;
opening a water inlet regulating valve, and injecting water into the aquifer by using an automatic water inlet tank so as to simulate the underground water aquifer of the actual stratum;
step six, simulating a pyrolysis process;
adjusting the temperature of a heating panel through a temperature control device, heating the coal bed at a heating rate of 5 ℃/min to 700 ℃, keeping for 4 hours, and simulating the in-situ pyrolysis process of the oil-rich coal;
collecting data and samples;
recording data of each sensor every 10min in the pyrolysis process, and collecting an oil sample, a water sample and a soil sample every 30 min;
keeping the temperature at 700 ℃ for 4 hours, closing the heating system to naturally cool the coal and rock stratum similar model, recording data of each sensor every 30min in the cooling process, and collecting oil samples, water samples and soil samples every 30 min;
step eight, observing and recording the morphological change of the similar model in the test process;
analyzing test data;
and (4) processing the temperature and pressure data collected in the seventh step and the eighth step, and testing and analyzing the water sample, the oil sample and the soil sample collected in the seventh step and the eighth step in a laboratory to obtain the results of pollutant migration and diffusion, a temperature field, a pressure field and fracture zone development change in the in-situ pyrolysis process of the oil-rich coal.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the heating panel arranged below the simulation test box is used for heating the coal-rock stratum similar model arranged in the simulation test box, so that the original state of the rock stratum is kept to the greatest extent, and the research on temperature fields and stress fields of various rock strata in the in-situ pyrolysis process of the oil-rich coal is facilitated.
2. The rock stratum filling materials in the coal rock stratum similarity model are common similarity simulation materials, are convenient to purchase and low in price, and can save test cost.
3. The system is reasonably distributed, and can reduce the in-situ pyrolysis process of the oil-rich coal in a laboratory, so that the system research on the change conditions of the migration diffusion of related pollutants, the temperature field and the stress field in the in-situ pyrolysis process of the coal resources with high content of hydrogen-rich structures and high tar yield of the oil-rich coal and the like is carried out.
The invention is described in further detail below with reference to the figures and examples.
Drawings
FIG. 1 is a schematic structural diagram of an in-situ pyrolysis simulation test device for oil-rich coal.
FIG. 2 is a schematic structural diagram of a coal-rock formation similarity model according to the present invention.
Fig. 3 is an exploded view of a similar simulation test apparatus of the present invention.
Description of reference numerals:
10-a similar simulation system; 11-simulation test box;
11-1-front panel; 11-2-simulation test box main body;
11-21-air inlet holes; 11-22-water outlet; 11-23-water inlet;
11-24-air outlet holes; 11-25-sample wells; 11-251 — a first sampling well;
11-252 — a second sampling well; 11-253-third sampling hole; 11-254-fourth sampling well;
11-26-front panel pallet; 12-coal and rock stratum similar model;
12-1-simulated coal seam; 12-2 — overburden one; 12-3-formation two;
12-4-stratum iii; 12-5-aqueous layer; 12-6-topsoil layer;
13-a nitrogen source; 14, an automatic water inlet tank; 15-water inlet regulating valve;
16-outlet valve; 17-a pressure reducing valve; 20-heating temperature control system;
21-a heating panel; 22-temperature control means; 30-a data acquisition system;
31-a water sample collecting device; 32-a pyrolysis oil collecting device;
32-1-condenser; 32-2-pyrolysis oil collection bottle;
32-3-exhaust pipe; 32-4-exhaust valve;
33-a sensor; 33-1 — a first temperature sensor group;
33-2 — a second temperature sensor group; 33-3 — a third temperature sensor group;
33-4 — a fourth temperature sensor group; 33-5 — a first pressure sensor group;
33-6 — a second pressure sensor group; 33-7 — a third pressure sensor group;
33-8 — a fourth pressure sensor group; 34-a data acquisition device;
35-a processor; 40-test bench.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. Here, the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
As shown in fig. 1 to fig. 3, the embodiment discloses a similar simulation test device for in-situ pyrolysis process of oil-rich coal, which is characterized by comprising: the simulation system 10, the heating temperature control system 20 and the data acquisition system 30; the simulation system 10 comprises a simulation test box 11 for building a coal stratum simulation model 12 in the simulation test box; the heating temperature control system 20 comprises a heating panel 21 and a temperature control device 22, the temperature control device 22 is connected with the heating panel 21 and is used for controlling the heating panel 21 to work, and the heating panel 21 is arranged below the simulation test box 11 and is in contact with the bottom plate of the simulation test box 11 and is used for transferring heat to the coal-rock stratum similar model 12 built in the simulation test box 1 through the bottom plate of the simulation test box 11; the data acquisition system 30 is connected with the simulation test box 11 and used for acquiring test data and samples, and the data acquisition system 30 is connected with the coal and rock stratum similar model in the simulation test box 11 and used for acquiring temperature and pressure information in the coal and rock stratum similar model.
In this embodiment, heating panel 21 through setting up in analogue test case 11 below heats for the similar model 12 of coal rock stratum of setting in analogue test case 11, furthest has kept the original state nature of stratum, be favorable to the research to each stratum temperature field of rich oil coal normal position pyrolysis in-process, stress field, adopted the heating rod to heat the coal seam among the avoided prior art, need directly place the heating rod in the coal seam, the coal seam can produce the gap in the heating process, can not keep the original state nature of coal seam and stratum, consequently the result that obtains in the experiment has great difference with the data of coal normal position exploitation, be unfavorable for the research of rich oil coal normal position pyrolysis. In this embodiment, the heating panel 21 may be a silicon carbide heating panel, and the temperature control device 22 includes a temperature sensor, a temperature display panel, a temperature adjustment button, and the like, so as to accurately control the temperature of the heating panel, the temperature rise rate, and the like.
As shown in fig. 1, the simulation modeling system 10 further includes a nitrogen source 13 capable of providing nitrogen, the nitrogen source 13 is communicated with the simulation test chamber 11 through a pipeline, and a pressure reducing valve 17 is arranged on the pipeline connecting the nitrogen source 13 and the simulation test chamber 11.
In this embodiment, nitrogen gas with a certain pressure is introduced into the simulation test chamber 11 to ensure that the coal does not generate spontaneous combustion in the pyrolysis process, and the rich-oil coal pyrolysis process can be performed, which is beneficial to the research of the in-situ pyrolysis of the rich-oil coal.
As shown in fig. 1, the analog simulation system 10 further includes an automatic water inlet tank 14, the automatic water inlet tank 14 is communicated with the simulation test chamber 11 through a pipeline, and a water inlet regulating valve 15 is disposed on the pipeline connecting the automatic water inlet tank 14 and the simulation test chamber 11.
As shown in fig. 1, the data acquisition system 30 includes a water sample collection device 31 and a pyrolysis oil collection device 32; the water sample collecting device 31 is communicated with the simulation test box 11 through a pipeline and is used for collecting water samples in aquifers in the rock stratum similar model in the in-situ pyrolysis process of the oil-rich coal, and a water outlet valve 16 is arranged on the pipeline connecting the water sample collecting device 31 and the simulation test box 11; the pyrolysis oil collecting device 32 is communicated with the simulation test box 11 through a pipeline and is used for collecting pyrolysis oil generated in the in-situ pyrolysis process of the oil-rich coal.
As shown in fig. 1, the pyrolysis oil collecting device 32 includes a condenser 32-1, a pyrolysis oil collecting bottle 32-2, and an exhaust pipe 32-3, wherein the condenser 32-1 is disposed outside the pyrolysis oil collecting bottle 32-2 and is used for cooling pyrolysis oil decomposed from the coal seam, one end of the exhaust pipe 32-3 is communicated with the pyrolysis oil collecting bottle 32-2, and an exhaust valve 32-4 is disposed on the exhaust pipe 32-3.
As shown in fig. 3, the simulation test box 11 includes a front panel 11-1 and a simulation test box main body 11-2, the front panel 11-1 is made of quartz glass and is detachably mounted on the simulation test box main body 11-2, and the front panel 11-1 is hermetically connected with the simulation test box main body 11-2. The quartz glass is transparent and has good high-temperature resistance and corrosion resistance, the quartz glass is used as a front panel, observation in the test process is facilitated, and the front panel can be detached in the air drying process of the coal strata similar model 12, so that the coal strata similar model 12 can be quickly and naturally air-dried. Meanwhile, in the embodiment, quartz glass is detachably mounted on the simulation test box main body 11-2 through a pressing plate, sealing gaskets are arranged between the quartz glass and the simulation test box main body 11-2 and between the quartz glass and the pressing plate to ensure the sealing performance of the simulation test box 12 in the test process, a front side panel supporting plate 11-26 is further arranged on the simulation test box main body 11-2, when the front side panel 11-1 is mounted, the lower end of the front side panel 11-1 is firstly placed on the front side panel supporting plate 11-26, then locking bolts are sequentially fastened, and the front side panel supporting plate 11-26 is convenient to dismount and mount the front side panel 11-1.
As shown in fig. 1 and 2, the coal and rock stratum similarity model 12 built in the simulation test box 11 comprises a simulated coal seam 12-1, an overburden layer one 12-2, a rock layer two 12-3, a rock layer three 12-4, a water-bearing layer 12-5 and a topsoil layer 12-6, wherein the simulated coal seam 12-1, the overburden layer one 12-2, the rock layer two 12-3, the rock layer three 12-4, the water-bearing layer 12-5 and the topsoil layer 12-6 are sequentially arranged from bottom to top according to a similarity principle;
the coal and rock stratum similarity model 12 selects a geometric similarity ratio to determine the size of the coal and rock stratum similarity model 12 according to the geometric size and the drilling data of the research area. The geometric similarity ratio is selected in this embodiment to be 1: 200 of a carrier; river sand, gypsum and whiting are selected as model filling materials according to mechanical properties, the filling material used in the embodiment is prepared by uniformly mixing the river sand, the gypsum and the whiting in different proportions with water to prepare a standard test piece, the size of the standard test piece is 50mm multiplied by 50mm, and then a mechanical property test is carried out by using equipment such as a universal testing machine, and the proportion of the filling materials of each rock stratum is finally determined. Wherein the overburden rock layer I12-2 and the rock layer III 12-4 are mudstone, and the proportion of river sand, gypsum and white powder is 7: 3: 7; the second rock stratum 12-3 is medium sandstone, and the proportion of river sand, gypsum and white powder is 8: 3: 7; the proportion of river sand, gypsum and white powder in the water-containing layer 12-5 is 8: 3: 7; the proportion of river sand, gypsum and white powder in the topsoil layer 12-6 is 4.5: 4.5: 1. the accuracy of the test result can be ensured.
The simulation test box main body 11-2 in this embodiment is disposed on the test bed 40, the test bed 40 is formed by welding stainless steel, has a size of 2400mm × 700mm × 500mm, is placed on the ground, the heating panel 21 is disposed on the test bed 40, and the simulation test box 11 is disposed on the heating panel 21. The simulation test box main body 11-2 is a six-sided box structure made of stainless steel, the adopted stainless steel is 31603 stainless steel, the external dimension of the box is 2100mm × 600mm × 1100mm, and the internal dimension of the box is 2000 × 500mm × 1000 mm. The simulation test box comprises a simulation test box body 11-2, and is characterized in that an air inlet hole 11-21 is formed in the side wall of the left side of the simulation test box body 11-2, the position of the air inlet hole 11-21 is over against the middle of a simulation coal bed 12-1 in a coal rock layer similar model 12, the other end of a pipeline connected with a nitrogen source 13 is connected with the air inlet hole 11-21, nitrogen can be introduced into the simulation test box 11 through the air inlet hole 11-21, oxygen in the test box 11 is replaced through the nitrogen, spontaneous combustion of the coal bed is prevented, and the coal bed is protected.
In the embodiment, the side wall on the right side of the simulation test box main body 11-2 is provided with water inlet holes 11-23, and the positions of the water inlet holes 11-23 are opposite to the top of a water-bearing layer 12-5 in the coal rock layer similar model 12; the other end of the pipeline connected with the automatic water inlet tank 14 is connected with the water inlet hole 11-23; the side wall of the left side of the simulation test box main body 11-2 is also provided with water outlet holes 11-22, the positions of the water outlet holes 11-22 are opposite to the bottom of a water bearing layer 12-5 in the coal rock layer similar model 12, and the other end of the pipeline connected with the water sample collecting device 31 is connected with the water outlet holes 11-22; the water sample collecting device 31 is a water sample collecting bottle and is used for collecting water samples of aquifers in the in-situ pyrolysis process of the rich-oil coal.
In the embodiment, the side wall on the right side of the simulation test box main body 11-2 is also provided with air outlet holes 11-24, and the positions of the air outlet holes 11-24 are opposite to the bottom of the simulated coal bed 12-1 in the coal rock layer similar model 12. The air outlet holes 11-24 are connected with the pyrolysis oil collecting device 32, the air outlet holes 11-24 are positioned on one side opposite to the air inlet holes 11-21, pyrolysis products generated in the pyrolysis process enter the condenser 32-1 through the air outlet holes 11-24, the pyrolysis oil is collected in the pyrolysis oil collecting bottle 32-2 through cooling of the condenser 32-1, and residual gas is discharged or collected and utilized through the exhaust pipe 32-3. Because the temperature is higher in the pyrolysis process, the pipelines adopted in the embodiment all adopt high-temperature-resistant hoses.
As shown in fig. 1 and 3, a sampling hole 11-25 is formed on the side wall of the rear side of the simulation test box main body 11-2; the number of the sampling holes 11-25 is four, and the sampling holes are respectively a first sampling hole 11-251, a second sampling hole 11-252, a third sampling hole 11-253 and a fourth sampling hole 11-254, wherein the first sampling hole 11-251 is over against the middle of an overburden layer I12-2 in the coal and rock layer similar model 12, the second sampling hole 11-252 is over against the middle of a rock layer II 12-3 in the coal and rock layer similar model 12, the third sampling hole 11-253 is over against the middle of a rock layer III 12-4 in the coal and rock layer similar model 12, and the fourth sampling hole 11-254 is over against the middle of an aquifer 12-5 in the coal and rock layer similar model 12.
As shown in fig. 1 and 2, the data acquisition system 30 further includes a sensor 33, a data acquisition device 34 and a processor 35 for processing data, the sensor 33 is disposed in the coal-rock formation similar model 12 and is used for acquiring temperature and pressure data information inside the coal-rock formation similar model 12, the data acquisition device 34 is connected with the sensor 33 and is used for collecting data information acquired by the sensor 33, and the data acquisition device 34 is connected with the processor 35 and is used for transmitting the acquired data to the processor 35; the processor 35 in this embodiment is a computer, and processes and analyzes the acquired data by a computer program. The data acquisition device 34 is provided with a data display panel which can display acquired data such as temperature, pressure and the like in real time, and the data acquisition device 34 is in wireless communication connection with the processor 35, so that wiring trouble is avoided. A wireless bluetooth data connection may be employed here.
The sensors 33 comprise four groups of temperature sensors and four groups of pressure sensors, wherein the four groups of temperature sensors are respectively a first temperature sensor group 33-1, a second temperature sensor group 33-2, a third temperature sensor group 33-3 and a fourth temperature sensor group 33-4; the four groups of pressure sensors are respectively a first pressure sensor group 33-5, a second pressure sensor group 33-6, a third pressure sensor group 33-7 and a fourth pressure sensor group 33-8; the first temperature sensor group 33-1 and the first pressure sensor group 33-5 are uniformly distributed at the top of the simulated coal seam 12-1 in the coal and rock stratum similar model 12; the second temperature sensor group 33-2 and the second pressure sensor group 33-6 are uniformly arranged in the middle of the overburden layer I12-2 in the coal and rock layer similar model 12; the third temperature sensor group 33-3 and the third pressure sensor group 33-7 are uniformly arranged in the middle of the second rock stratum 12-3 in the coal rock stratum similar model 12; the fourth temperature sensor group 33-4 and the fourth pressure sensor group 33-8 are uniformly arranged in the middle of the third rock stratum 12-4 in the coal rock stratum similar model 12. The four groups of temperature sensors are all K-type thermocouples.
The invention also discloses a method for carrying out the similar simulation test of the in-situ pyrolysis process of the oil-rich coal by using the similar simulation test device of the in-situ pyrolysis process of the oil-rich coal, which comprises the following steps:
step one, building a coal rock stratum similar model 12 in a simulation test box 11;
the coal and rock stratum similarity model 12 selects a geometric similarity ratio of 1: 200, selecting river sand, gypsum and white powder as model filling materials according to mechanical properties, determining the proportion of the river sand, the gypsum and the white powder in the overburden rock layer I12-2, the rock layer II 12-3, the rock layer III 12-4, the aquifer 12-5 and the topsoil layer 12-6 according to the stress-strength similarity ratio and the geometric similarity ratio, and calculating materials required by each rock layer according to the thickness of each rock layer, the volume weight of similar materials and the size of the model;
step two, arranging a sensor 33;
in the process of building the coal and rock stratum similar model 12, a first temperature sensor group 33-1 and a first pressure sensor group 33-5 are arranged at the top of the simulated coal seam 12-1, a second temperature sensor group 33-2 and a second pressure sensor group 33-6 are arranged in the middle of the first overburden rock stratum 12-2, a third temperature sensor group 33-3 and a third pressure sensor group 33-7 are arranged in the middle of the second overburden rock stratum 12-3, and a fourth temperature sensor group 33-4 and a fourth pressure sensor group 33-8 are arranged in the middle of the third rock stratum 12-4;
step three, air-drying the coal rock stratum similar model 12;
removing the front side panel 11-1, and naturally drying the coal rock layer similar model 12;
step four, sealing the simulation test box 11;
after the coal rock stratum similarity model 12 is naturally air-dried, installing a front side panel 11-1, and checking whether the simulation test box 11 is sealed;
step five, gas supply and water injection;
nitrogen is supplied into the simulation test box 11 by utilizing the air inlet holes 11-21 so as to ensure that the coal does not generate spontaneous combustion in the pyrolysis process;
opening a water inlet regulating valve 15, and injecting water into the aquifers 12-5 by using an automatic water inlet tank 14 so as to simulate the underground water aquifers of the actual stratum;
step six, simulating a pyrolysis process;
the temperature of the heating panel 21 is adjusted through the temperature control device 22, the coal bed is heated, the heating rate is 5 ℃/min, the temperature is increased to 700 ℃, the temperature is kept for 4 hours, and the in-situ pyrolysis process of the oil-rich coal is simulated;
collecting data and samples;
in the pyrolysis process, recording the data of each sensor 33 every 10min, and collecting an oil sample, a water sample and a soil sample every 30 min;
keeping the temperature at 700 ℃, closing the heating system 20 after 4 hours to naturally cool the coal and rock stratum similarity model 12, recording data of each sensor 33 every 30min in the cooling process, and collecting oil samples, water samples and soil samples every 30 min;
step eight, observing and recording the morphological change of the similar model in the test process;
analyzing test data;
and (4) processing the temperature and pressure data collected in the seventh step and the eighth step, and testing and analyzing the water sample, the oil sample and the soil sample collected in the seventh step and the eighth step in a laboratory to obtain the results of pollutant migration and diffusion, a temperature field, a pressure field and fracture zone development change in the in-situ pyrolysis process of the oil-rich coal.
The rock stratum filling materials in the coal rock stratum similarity model are common similarity simulation materials, are convenient to purchase and low in price, and can save test cost. According to the invention, the heating device is arranged at the bottom of the coal rock layer simulation test box, and heat is transferred to the bottom panel of the box body through the temperature regulating system, so that the coal layer is directly pyrolyzed. Compared with a heating mode adopting a heating rod, the heating mode is more uniform in heating, and the original state of the coal bed and the rock stratum is well kept.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a similar analogue test device of rich oil coal normal position pyrolysis process which characterized in that includes: the system comprises a similar simulation system (10), a heating temperature control system (20) and a data acquisition system (30);
the simulation system (10) comprises a simulation test box (11) for building a coal stratum simulation model (12) in the simulation test box;
the heating temperature control system (20) comprises a heating panel (21) and a temperature control device (22), the temperature control device (22) is connected with the heating panel (21) and is used for controlling the heating panel (21) to work, and the heating panel (21) is arranged below the simulation test box (11) and is in contact with a bottom plate of the simulation test box (11) to be used for transferring heat to a coal strata similarity model (12) built in the simulation test box (11) through the bottom plate of the simulation test box (11);
the data acquisition system (30) is connected with the simulation test box (11) and used for acquiring test data and samples, and the data acquisition system (30) is connected with the coal and rock stratum similar model in the simulation test box (11) and used for acquiring temperature and pressure information in the coal and rock stratum similar model.
2. The simulation test device for the in-situ pyrolysis process of the oil-rich coal as claimed in claim 1, wherein the simulation system (10) further comprises a nitrogen source (13) capable of providing nitrogen, the nitrogen source (13) is communicated with the simulation test chamber (11) through a pipeline, and a pressure reducing valve (17) is arranged on the pipeline connecting the nitrogen source (13) and the simulation test chamber (11).
3. The simulation test device for simulating the in-situ pyrolysis process of rich coal as claimed in claim 2, wherein the simulation system (10) further comprises an automatic water inlet tank (14), the automatic water inlet tank (14) is connected with the simulation test chamber (11) through a pipeline, and a water inlet regulating valve (15) is arranged on the pipeline connecting the automatic water inlet tank (14) and the simulation test chamber (11).
4. The in-situ pyrolysis process simulation test device for oil-rich coal according to claim 3, wherein the data acquisition system (30) comprises a water sample collection device (31) and a pyrolysis oil collection device (32);
the water sample collecting device (31) is communicated with the simulation test box (11) through a pipeline and is used for collecting water samples in aquifers in the rock stratum similar model in the in-situ pyrolysis process of the oil-rich coal, and a water outlet valve (16) is arranged on the pipeline connecting the water sample collecting device (31) and the simulation test box (11);
the pyrolysis oil collecting device (32) is communicated with the simulation test box (11) through a pipeline and is used for collecting pyrolysis oil generated in the in-situ pyrolysis process of the oil-rich coal.
5. The in-situ pyrolysis process simulation test device for the oil-rich coal according to claim 4, wherein the pyrolysis oil collecting device (32) comprises a condenser (32-1), a pyrolysis oil collecting bottle (32-2) and an exhaust pipe (32-3), the condenser (32-1) is arranged outside the pyrolysis oil collecting bottle (32-2) and is used for cooling the pyrolysis oil decomposed from the coal seam, one end of the exhaust pipe (32-3) is communicated with the pyrolysis oil collecting bottle (32-2), and the exhaust pipe (32-3) is provided with an exhaust valve (32-4).
6. The simulation test device for simulating the in-situ pyrolysis process of rich coal as claimed in claim 1, wherein the simulation test box (11) comprises a front panel (11-1) and a simulation test box main body (11-2), the front panel (11-1) is made of quartz glass and is detachably mounted on the simulation test box main body (11-2), and the front panel (11-1) is hermetically connected with the simulation test box main body (11-2).
7. The oil-rich coal in-situ pyrolysis process simulation test device according to claim 6, wherein the coal and rock stratum simulation model (12) built in the simulation test box (11) comprises a simulation coal bed (12-1), an overburden layer I (12-2), a rock layer II (12-3), a rock layer III (12-4), a water-bearing layer (12-5) and a surface soil layer (12-6), and the simulation coal bed (12-1), the overburden layer I (12-2), the rock layer II (12-3), the rock layer III (12-4), the water-bearing layer (12-5) and the surface soil layer (12-6) are sequentially arranged from bottom to top according to a similar principle;
an air inlet (11-21) is formed in the side wall of the left side of the simulation test box main body (11-2), and the position of the air inlet (11-21) is over against the middle of a simulation coal seam (12-1) in the coal and rock stratum similar model (12);
a water outlet hole (11-22) is further formed in the side wall of the left side of the simulation test box main body (11-2), and the position of the water outlet hole (11-22) is over against the bottom of a water-bearing layer (12-5) in the coal and rock stratum similar model (12);
a water inlet hole (11-23) is formed in the side wall on the right side of the simulation test box main body (11-2), and the position of the water inlet hole (11-23) is over against the top of a water-bearing layer (12-5) in the coal and rock stratum similar model (12);
the side wall of the right side of the simulation test box main body (11-2) is further provided with air outlet holes (11-24), and the positions of the air outlet holes (11-24) are opposite to the bottom of the simulated coal bed (12-1) in the coal and rock stratum similar model (12).
8. The oil-rich coal in-situ pyrolysis process simulation test device as claimed in claim 6, wherein a sampling hole (11-25) is formed in the side wall of the rear side of the simulation test box main body (11-2);
the number of the sampling holes (11-25) is four, and the sampling holes are respectively a first sampling hole (11-251), a second sampling hole (11-252), a third sampling hole (11-253) and a fourth sampling hole (11-254), wherein the first sampling hole (11-251) is over against the middle of an overlying strata I (12-2) in the coal strata similar model (12), the second sampling hole (11-252) is over against the middle of a strata II (12-3) in the coal strata similar model (12), the third sampling hole (11-253) is over against the middle of a strata III (12-4) in the coal strata similar model (12), and the fourth sampling hole (11-254) is over against the middle of an aquifer (12-5) in the coal strata similar model (12).
9. The oil-rich coal in-situ pyrolysis process simulation test device according to claim 4, wherein the data acquisition system (30) further comprises a sensor (33), a data acquisition device (34) and a processor (35) for processing data, the sensor (33) is arranged in the coal formation similar model (12) and is used for acquiring temperature and pressure data information inside the coal formation similar model (12), the data acquisition device (34) is connected with the sensor (33) and is used for collecting data information acquired by the sensor (33), and the data acquisition device (34) is connected with the processor (35) and is used for transmitting the acquired data to the processor (35);
the sensors (33) comprise four groups of temperature sensors and four groups of pressure sensors, wherein the four groups of temperature sensors are respectively a first temperature sensor group (33-1), a second temperature sensor group (33-2), a third temperature sensor group (33-3) and a fourth temperature sensor group (33-4);
the four groups of pressure sensors are respectively a first pressure sensor group (33-5), a second pressure sensor group (33-6), a third pressure sensor group (33-7) and a fourth pressure sensor group (33-8);
the first temperature sensor group (33-1) and the first pressure sensor group (33-5) are uniformly distributed at the top of the simulated coal seam (12-1) in the coal and rock stratum similar model (12);
the second temperature sensor group (33-2) and the second pressure sensor group (33-6) are uniformly distributed in the middle of the overburden layer I (12-2) in the coal and rock layer similar model (12);
the third temperature sensor group (33-3) and the third pressure sensor group (33-7) are uniformly distributed in the middle of the second rock stratum (12-3) in the coal-rock stratum similar model (12);
the fourth temperature sensor group (33-4) and the fourth pressure sensor group (33-8) are uniformly arranged in the middle of a third rock stratum (12-4) in the coal-rock stratum similar model (12).
10. A method for performing the simulation test of the in-situ pyrolysis process of the oil-rich coal by using the simulation test device of the in-situ pyrolysis process of the oil-rich coal of claim 9, wherein: the method comprises the following steps:
step one, building a coal rock stratum similar model (12) in a simulation test box (11);
the coal and rock stratum similarity model (12) selects a geometric similarity ratio of 1: 200, selecting river sand, gypsum and white powder as model filling materials according to mechanical properties, determining the proportion of the river sand, the gypsum and the white powder in the overburden stratum I (12-2), the overburden stratum II (12-3), the overburden stratum III (12-4), the aquifer (12-5) and the topsoil layer (12-6) according to the stress-strength similarity ratio and the geometric similarity ratio, and calculating materials required by each stratum according to the thickness of each stratum, the volume weight of similar materials and the size of the model;
step two, arranging a sensor (33);
in the process of building a coal and rock stratum similar model (12), a first temperature sensor group (33-1) and a first pressure sensor group (33-5) are arranged at the top of a simulated coal seam (12-1), a second temperature sensor group (33-2) and a second pressure sensor group (33-6) are arranged in the middle of an overlying strata I (12-2), a third temperature sensor group (33-3) and a third pressure sensor group (33-7) are arranged in the middle of a strata II (12-3), and a fourth temperature sensor group (33-4) and a fourth pressure sensor group (33-8) are arranged in the middle of a strata III (12-4);
step three, air-drying the coal rock stratum similar model (12);
the front side panel (11-1) is removed, and the coal rock layer similar model (12) is naturally dried;
step four, sealing the simulation test box (11);
after the coal rock stratum similar model (12) is naturally air-dried, installing a front side panel (11-1), and checking whether the simulation test box (11) is sealed;
step five, gas supply and water injection;
nitrogen is supplied into the simulation test box (11) by utilizing the air inlet holes (11-21) so as to ensure that the coal does not generate spontaneous combustion phenomenon in the pyrolysis process;
opening a water inlet regulating valve (15) and injecting water into the aquifer (12-5) by using an automatic water inlet tank (14) so as to simulate the underground water aquifer of the actual stratum;
step six, simulating a pyrolysis process;
the temperature of the heating panel (21) is adjusted through the temperature control device (22), the coal bed is heated, the heating rate is 5 ℃/min, the temperature is raised to 700 ℃, the temperature is kept for 4 hours, and the in-situ pyrolysis process of the oil-rich coal is simulated;
collecting data and samples;
in the pyrolysis process, recording the data of each sensor (33) every 10min, and collecting an oil sample, a water sample and a soil sample every 30 min;
keeping the temperature at 700 ℃ for 4 hours, closing the heating system (20), naturally cooling the coal and rock stratum similarity model (12), recording the data of each sensor (33) every 30min in the cooling process, and collecting an oil sample, a water sample and a soil sample every 30 min;
step eight, observing and recording the morphological change of the similar model in the test process;
analyzing test data;
and (4) processing the temperature and pressure data collected in the seventh step and the eighth step, and testing and analyzing the water sample, the oil sample and the soil sample collected in the seventh step and the eighth step in a laboratory to obtain the results of pollutant migration and diffusion, a temperature field, a pressure field and fracture zone development change in the in-situ pyrolysis process of the oil-rich coal.
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| CN116626088A (en) * | 2023-03-13 | 2023-08-22 | 陕西省煤田地质集团有限公司 | Deformation characteristic testing device and method for high-temperature pyrolysis of oil-rich coal |
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