CN114660266A - Test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock and working method - Google Patents
Test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock and working method Download PDFInfo
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Abstract
The invention discloses a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock and a working method, and the test system comprises a confining pressure cylinder, wherein a clamping cylinder for clamping an organic rock sample is arranged in the confining pressure cylinder, a liquid injection port communicated with an annular channel is formed in the side wall of the confining pressure cylinder, and a heater is further arranged on the side wall of the confining pressure cylinder; a pressure bearing block which is propped against the lower end of the upper cover plate and the upper end of the organic rock sample is hermetically arranged in the first connecting piece, and an electric heating rod, an inert gas input pipe and a pyrolysis gas output pipe which penetrate through the pressure bearing block and the upper cover plate are arranged in the organic rock sample; a pressurizing pressing block is arranged in the second connecting piece in a sealing manner, the lower end of the pressurizing pressing block is connected with a pressurizing device penetrating through the lower cover plate, and a seepage product output pipe penetrating through the pressurizing pressing block is arranged in the organic rock sample. The invention can effectively overcome the defect that the sample is easy to be stressed unevenly due to rigid constraint, has high heating efficiency, and considers the influence of seepage evolution on the transportation of pyrolysis gas in the pyrolysis process.
Description
Technical Field
The invention belongs to the technical field of in-situ pyrolysis utilization of underground deep rock masses, and particularly relates to a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock and a working method.
Background
For many years, numerous researchers have actively sought petroleum alternative routes to produce fuel oil, which is considered an effective method for mitigating the oil crisis from coal liquefaction. However, the ground carbonization coal-to-liquid technology is easy to cause resource waste in the process of mining and conversion. The traditional coal-to-liquid process discharges a large amount of gas pollutants, organic compounds and particle pollutants to cause serious environmental pollution. Meanwhile, coal mining accidents and casualties occur frequently. Under the situation that petroleum energy is increasingly tense, the development of oil and gas resources in underground organic rock is focused, and the significance of guaranteeing the energy safety strategy is achieved.
The in-situ pyrolysis of the underground organic rock refers to a technology that the underground organic rock is directly injected with heat under the formation pressure without being exploited to promote the pyrolysis of the organic rock, and then an oil gas product separated out in the in-situ pyrolysis process is extracted to the ground for separation and utilization. Compared with the conventional ground pyrolysis technology, the in-situ pyrolysis does not need to build a large-scale post-treatment facility, is beneficial to developing deep organic rock resources, and has the advantages of small occupied area, low investment, high environmental protection benefit and the like. The method for extracting oil gas by in-situ pyrolysis of underground organic rock is used as a future organic rock, and the law and mechanism for extracting oil gas by in-situ pyrolysis of underground organic rock are not clear under the multiple coupling conditions of temperature, stress, seepage, concentration and the like by using a revolutionary technology.
The underground organic rock is a non-continuous medium with non-homogeneous, anisotropic and porous-joint properties, and has poor permeability, low thermal conductivity and small carbonization temperature range. Therefore, how to simulate the underground environment in a laboratory to carry out high-temperature and high-pressure pyrolysis test guidance engineering actually always troubles numerous scholars at home and abroad. Patent application No. 202021045210.X discloses a true triaxial pressure chamber test apparatus in which a cuboid rock sample is prepared for in situ testing that is capable of simulating the pressure of the underground environment using rigid restraint applied stress. But rigid binding easily causes uneven stress on the sample, and is difficult to carry out high-temperature and high-pressure pyrolysis test by coupled heating due to the limitation of a pressurization mode. The application No. 201110267767.7 discloses a high temperature and high pressure triaxial test device and method for organic rock mass, the application heats an organic rock mass sample under a preset pressure, the heating starts from room temperature until the organic rock mass sample starts to decompose, and pyrolysis products are collected and corresponding temperature and pressure are recorded. However, the application only adopts an electric heating mode with low heating efficiency, and the influence of seepage evolution on pyrolysis gas transportation in the pyrolysis process is not considered.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a test system and a working method for simulating in-situ pyrolysis oil gas extraction of underground organic rock, which can effectively overcome the defect that rigid constraint is easy to cause uneven stress on a sample, have high heating efficiency, consider the influence of seepage evolution on pyrolysis gas transportation in the pyrolysis process, and facilitate the research of rules and mechanisms of multi-coupling conditions on the in-situ pyrolysis oil gas extraction of the underground organic rock under temperature, stress, seepage and concentration fields.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock comprises a confining pressure barrel, wherein the top and the bottom of the confining pressure barrel are respectively provided with an upper cover plate and a lower cover plate, a clamping barrel for clamping an organic rock sample is arranged in the confining pressure barrel, the position, close to the top, of the clamping barrel is in sealing detachable connection with the bottom of the upper cover plate and the top of the confining pressure barrel through a first connecting piece which is communicated up and down, and the position, close to the bottom, of the clamping barrel is in sealing detachable connection with the top of the lower cover plate and the bottom of the confining pressure barrel through a second connecting piece which is communicated up and down; an annular channel is formed between the confining pressure barrel and the first connecting piece as well as between the confining pressure barrel and the clamping barrel, a liquid injection port communicated with the annular channel is formed in the side wall of the confining pressure barrel, and a heater is further arranged on the side wall of the confining pressure barrel; the first connecting piece is internally provided with a pressure bearing block which is pressed against the lower end of the upper cover plate and the upper end of the organic rock sample in a sealing manner, and the organic rock sample is internally provided with an electric heating rod, an inert gas input pipe and a pyrolysis gas output pipe which penetrate through the pressure bearing block and the upper cover plate; the second connecting piece internal seal is provided with the pressurization briquetting, the lower extreme of pressurization briquetting is connected with and runs through the pressure device of apron down, be provided with in the organic rock sample and run through the seepage flow product output tube of pressurization briquetting.
Further, still include heat exchanger, inert gas high pressure storage jar and plunger pump, still seted up on the lateral wall of confining pressure section of thick bamboo with the steam port that unloads of annular channel intercommunication, the output of inert gas high pressure storage jar with the first input of heat exchanger is connected, the first output of heat exchanger with the inert gas input tube is connected, be provided with first pressure gauge on the inert gas input tube, unload the steam port with the second input of heat exchanger is connected, unload the steam port with be provided with first valve between the heat exchanger, the second output of heat exchanger with the input of plunger pump is connected, the output of plunger pump with annotate the liquid mouth and connect.
The pyrolysis gas recovery device comprises an oil gas absorption unit for absorbing oil gas in the pyrolysis gas, a second pressure gauge and a second valve are arranged on the pyrolysis gas output pipe, the pyrolysis gas output pipe is connected with the input end of the cooling separator, and the output end of the cooling separator is connected with the oil gas absorption unit.
Further, the pyrolysis gas recovery device also comprises a filtering unit, a drying unit and a pyrolysis gas recovery unit, wherein the oil gas absorption unit is connected with the filtering unit, the filtering unit is connected with the drying unit, and the drying unit is connected with the pyrolysis gas recovery unit.
Furthermore, still include seepage flow result recovery unit, seepage flow result recovery unit with seepage flow result output tube connects, be provided with third pressure gauge and third valve on the seepage flow result output tube.
Furthermore, a thermocouple penetrating through the pressure bearing block and the upper cover plate is further arranged in the organic rock sample.
Furthermore, a thermometer for measuring the temperature in the annular channel, a fourth pressure gauge for measuring the pressure in the annular channel and a liquid level meter for measuring the liquid level in the annular channel are further arranged on the side wall of the confining pressure cylinder.
Further, the clamping cylinder is made of T2 red copper.
The pressure device comprises a support, wherein the upper cover plate and the lower cover plate are connected to the support, a bottom plate is arranged at the bottom of the support, and the pressure device is arranged on the bottom plate.
A working method of a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock comprises the following steps:
controlling the pressurizing device to apply a set axial load to the organic rock sample in the clamping cylinder through the pressurizing pressing block;
adding confining pressure liquid into the annular channel through the liquid injection port, controlling the heater to heat the confining pressure liquid to a set temperature, and applying confining pressure to the organic rock sample in the clamping cylinder by the heated confining pressure liquid;
inputting inert gas with set temperature into the organic rock sample in the clamping cylinder through the inert gas input pipe to carry out convection heating on the organic rock sample, and measuring the seepage pressure of the seepage product output pipe;
controlling the electric heating rod to electrically heat the organic rock sample in the clamping cylinder;
and after heating to the pyrolysis temperature, outputting pyrolysis gas through the pyrolysis gas output pipe and extracting oil gas in the pyrolysis gas.
Compared with the prior art, the invention has at least the following beneficial effects: according to the test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock, when the test system works, confining pressure liquid is added into the annular channel through the liquid injection port, the heater is controlled to heat the confining pressure liquid to the set temperature, and the heated confining pressure liquid applies confining pressure to the organic rock sample in the clamping cylinder. Carry out convection heating to organic matter rock sample through the inert gas of inert gas input set temperature in to the organic matter rock sample in the clamping cylinder, that is to say, the inert gas after will heating lets in organic matter rock sample, realize convection heating, heating efficiency improves greatly, and simultaneously, utilize the electric heating rod to carry out electrical heating to the organic matter rock sample in the clamping cylinder, realize the coupling heating of multiple heating methods, organic matter rock sample is whole to be heated evenly, the heat loss is little and heating rate is fast, can shorten the heat time by a wide margin. The bottom of the organic rock sample is provided with a seepage product output pipe, the top of the organic rock sample is provided with a pyrolysis gas output pipe, the influence of seepage evolution on pyrolysis gas transportation in the pyrolysis process is considered by measuring the seepage pressure of the seepage product output pipe and extracting oil gas in the pyrolysis gas through the pyrolysis gas output pipe, and the rule and mechanism of extracting oil gas from underground organic rock in-situ pyrolysis under multi-coupling conditions under temperature, stress, seepage and concentration fields are conveniently researched. In addition, the position of being close to the top on the centre gripping section of thick bamboo and the bottom of upper cover plate and the top of enclosing a pressure section of thick bamboo can be dismantled through the sealed connection that has a perfect understanding from top to bottom through the first connecting piece that link up from top to bottom, and the position of being close to the bottom on the centre gripping section of thick bamboo and the top of apron and the bottom of enclosing a pressure section of thick bamboo can be dismantled through the sealed connection that has a perfect understanding from top to bottom, according to experimental demand, can make things convenient for nimble not unidimensional centre gripping section of thick bamboo of change for but the practicality is better.
Furthermore, the side wall of the confining pressure cylinder is provided with a steam discharging port communicated with the annular channel, when the annular channel is over-temperature and over-pressure, the steam discharging port is used for facilitating adjustment, meanwhile, high-temperature steam output by the steam discharging port is used for carrying out auxiliary heating on inert gas, secondary utilization of system heat energy is achieved, cooled liquid is input into the annular channel, recycling of system resources is achieved, and balance of confining pressure in the annular channel is maintained.
Furthermore, a second pressure gauge and a second valve are arranged on the pyrolysis gas output pipe, the pyrolysis gas output pipe is connected with the input end of the cooling separator, the output end of the cooling separator is connected with the oil gas absorption unit, after the second valve is opened, oil gas in the pyrolysis gas generated by pyrolysis in the organic rock sample is recycled by the oil gas absorption unit for subsequent test analysis, and the output pressure of the pyrolysis gas can be conveniently measured by using the second pressure gauge.
Furthermore, the invention utilizes the filtering unit, the drying unit and the pyrolysis gas recovery unit to filter, dry and recover the pyrolysis gas after the oil gas is recovered, thereby realizing the full utilization of the pyrolysis gas.
Furthermore, the device also comprises a seepage product recovery device, the seepage product recovery device is connected with a seepage product output pipe, a third pressure gauge and a third valve are arranged on the seepage product output pipe, after the third valve is opened, the seepage product enters the seepage product recovery device through the seepage product output pipe, and the seepage pressure is conveniently measured through the third pressure gauge.
Furthermore, a thermocouple penetrating through the bearing block and the upper cover plate is arranged in the organic rock sample, and the temperature of the organic rock sample can be conveniently measured through the thermocouple.
Furthermore, a thermometer used for measuring the temperature in the annular channel, a fourth pressure gauge used for measuring the pressure in the annular channel and a liquid level meter used for measuring the liquid level in the annular channel are arranged on the side wall of the confining pressure cylinder, the temperature of liquid in the annular channel is convenient to monitor through the thermometer, the confining pressure in the annular channel is convenient to monitor through the four pressure gauges, and the liquid level height of liquid in the annular channel is convenient to monitor and master through the liquid level meter.
Furthermore, the clamping cylinder is made of T2 red copper, and the organic rock sample is coated by the T2 red copper pipe sleeve, so that the clamping cylinder can be sealed and airtight in the in-situ pyrolysis process, has a good pressure transmission effect and a good temperature resistance effect, is not cracked when pressurized, and is uniformly heated and does not react.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to the invention;
fig. 2 is a partial structural schematic diagram of fig. 1.
In the figure: 1-enclosing and pressing a cylinder; 2-upper cover plate; 3-lower cover plate; 4-a clamping cylinder; 5-organic rock sample; 6-a first connector; 7-a second connector; 8-an annular channel; 9-a pressure-bearing block; 10-pressing and briquetting; 11-a pressurizing device; 12-an electrical heating rod; 13-inert gas input pipe; 14-pyrolysis gas output pipe; 15-a seepage product output pipe; 16-a liquid injection port; 17-a heater; 18-steam discharge port; 19-a heat exchanger; 20-inert gas high-pressure storage tank; 21-a plunger pump; 22-a first pressure gauge; 23-a first valve; 24-a hydrocarbon absorption unit; 25-a cooling separator; 26-a second pressure gauge; 27-a second valve; 28-a filtration unit; 29-a drying unit; 30-pyrolysis gas recovery unit; 31-a permeate product recovery unit; 32-a third pressure gauge; 33-a third valve; 34-a thermocouple; 35-a thermometer; 36-a fourth pressure gauge; 37-a liquid level meter; 38-a scaffold; 39-a base plate; 40-a hydraulic station; 41-power supply; 42-an electronic control unit.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As a specific embodiment of the present invention, referring to fig. 1 and 2, a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock comprises a confining pressure cylinder 1, wherein an upper cover plate 2 and a lower cover plate 3 are respectively arranged at the top and the bottom of the confining pressure cylinder 1, a clamping cylinder 4 for clamping an organic rock sample 5 is arranged in the confining pressure cylinder 1, a position on the clamping cylinder 4 close to the top is hermetically and detachably connected with the bottom of the upper cover plate 2 and the top of the confining pressure cylinder 1 through a first connecting member 6 which is vertically penetrated, and a position on the clamping cylinder 4 close to the bottom is hermetically and detachably connected with the top of the lower cover plate 3 and the bottom of the confining pressure cylinder 1 through a second connecting member 7 which is vertically penetrated; an annular channel 8 is formed between the confining pressure cylinder 1 and the first connecting piece 6 and the clamping cylinder 4. In the embodiment, a support 38 is designed, an upper cover plate 2 and a lower cover plate 3 are installed on the support 38, a graphite sealing gasket is adopted for sealing between a first connecting piece 6 and a clamping cylinder 4, between the upper cover plate 2 and between the first connecting piece 6 and an confining pressure cylinder 1, and the first connecting piece 6 is connected with the upper cover plate 2 through a bolt; in a similar way, the second connecting piece 7, the clamping cylinder 4, the lower cover plate 3 and the confining pressure cylinder 1 are sealed by graphite sealing gaskets, and the second connecting piece 7 is connected with the lower cover plate 3 through bolts. And the clamping cylinder 4 and the organic rock sample 5 in the clamping cylinder 4 are convenient to replace due to the adoption of bolt connection. Preferably, the holding cylinder 4 is made of T2 red copper.
Referring to fig. 1 and 2, a pressure-bearing block 9 is hermetically disposed in the first connecting member 6 and abuts against the lower end of the upper cover plate 2 and the upper end of the organic rock sample 5, an electrical heating rod 12 penetrating through the pressure-bearing block 9 and the upper cover plate 2, an inert gas input tube 13 and a pyrolysis gas output tube 14 are disposed in the organic rock sample 5, the organic rock sample 5 is electrically heated by the electrical heating rod 12, the organic rock sample 5 is heated by convection by introducing hot inert gas into the organic rock sample 5 through the inert gas input tube 13, and pyrolysis gas generated by the organic rock sample 5 is output through the pyrolysis gas output tube 14. Preferably, a thermocouple 34 penetrating the pressure bearing block 9 and the upper cover plate 2 is further provided in the organic rock sample 5, and the temperature in the organic rock sample 5 is measured by the thermocouple 34. Specifically, the thermocouple 34 is connected to a power source 41, and an electronic control unit 42 is provided between the thermocouple 34 and the power source 41.
Referring to fig. 1 and 2, a pressurizing press block 10 is hermetically arranged in the second connecting member 7, the lower end of the pressurizing press block 10 is connected with a pressurizing device 11 penetrating through the lower cover plate 3, a seepage product output pipe 15 penetrating through the pressurizing press block 10 is arranged in the organic rock sample 5, and the seepage product of the organic rock sample 5 is output through the seepage product output pipe 15. In this embodiment, a bottom plate 39 is disposed at the bottom of the support 38, and the pressurizing device 11 is disposed on the bottom plate 39, specifically, as shown in fig. 2, the pressurizing device 11 is a hydraulic cylinder, the hydraulic cylinder is connected to a hydraulic station 40, the hydraulic station 40 injects oil into the hydraulic cylinder at the lower side, the high-pressure oil pushes the hydraulic cylinder against the pressurizing briquette 10, and the pressurizing briquette 10 applies axial pressure to the organic rock sample 5.
As shown in fig. 2, a liquid injection port 16 communicating with the annular passage 8 is opened on the side wall of the confining pressure cylinder 1, and liquid, which is water in the present embodiment, is injected into the annular passage 8 through the liquid injection port 16. A heater 17 is provided on the side wall of the confining pressure cylinder 1, and the liquid injected into the annular passage 8 is heated by the heater 17. Preferably, a steam discharging port 18 communicated with the annular channel 8 is further formed in the side wall of the confining pressure cylinder 1, and the confining pressure in the annular channel 8 is adjusted through the steam discharging port 18, that is, after the annular channel 8 is over-temperature and over-pressure, steam is discharged through the steam discharging port 18, so that the temperature and the pressure in the annular channel 8 are kept constant, and the required confining pressure load is provided for the organic rock sample 5.
Specifically, the test system further comprises a heat exchanger 19, an inert gas high-pressure storage tank 20 and a plunger pump 21, wherein the output end of the inert gas high-pressure storage tank 20 is connected with the first input end of the heat exchanger 19, the first output end of the heat exchanger 19 is connected with an inert gas input pipe 13, a first pressure gauge 22 is arranged on the inert gas input pipe 13, the first pressure gauge 22 is used for measuring the pressure of inert gas entering the organic rock sample 5, a steam unloading port 18 is connected with the second input end of the heat exchanger 19, a first valve 23 is arranged between the steam unloading port 18 and the heat exchanger 19, the second output end of the heat exchanger 19 is connected with the input end of the plunger pump 21, and the output end of the plunger pump 21 is connected with the liquid injection port 16. That is, after a set amount of liquid is injected into the annular channel 8 and the liquid is heated, after the first valve 23 is opened, high-temperature steam passes through the heat exchanger 19, the inert gas passing through the heat exchanger 19 can be heated by using heat carried by the steam, and at the same time, the cooled steam is condensed into liquid and enters the annular channel 8 through the plunger pump 21 for recycling. And in the gas injection/liquid phase process, the injection pressure is kept to be 2-3 MPa lower than the confining pressure, so that side leakage is prevented.
Preferably, as shown in fig. 2, a thermometer 35 for measuring the temperature in the annular passage 8, a fourth pressure gauge 36 for measuring the pressure in the annular passage 8, and a liquid level gauge 37 for measuring the liquid level in the annular passage 8 are further provided on the side wall of the confining pressure cylinder 1.
As shown in fig. 2, the test system further includes a pyrolysis gas recovery device and a cooling separator 25, specifically, the pyrolysis gas recovery device includes an oil gas absorption unit 24 for absorbing oil gas in the pyrolysis gas, a filter unit 28 for filtering impurities in the pyrolysis gas, a drying unit 29 for drying the pyrolysis gas, and a pyrolysis gas recovery unit 30 for recovering the dried pyrolysis gas, a second pressure gauge 26 and a second valve 27 are disposed on the pyrolysis gas output pipe 14, the pyrolysis gas output pipe 14 is connected to an input end of the cooling separator 25, an output end of the cooling separator 25 is connected to the oil gas absorption unit 24, the oil gas absorption unit 24 is connected to the filter unit 28, the filter unit 28 is connected to the drying unit 29, and the drying unit 29 is connected to the pyrolysis gas recovery unit 30. After the second valve 27 is opened, pyrolysis gas generated by pyrolysis of the organic rock sample 5 is output from the pyrolysis gas output pipe 14, the second pressure gauge 26 is used for measuring output pressure of the pyrolysis gas, the cooling separator 25 is used for cooling the high-temperature pyrolysis gas, the cooled gas-liquid mixture enters the oil-gas absorption unit 24, the oil-gas absorption unit 24 absorbs oil gas, and the absorbed oil gas is used for subsequent test analysis. In this embodiment, the oil and gas absorption unit 24 is filled with isopropyl alcohol, the filtration unit 28 is filled with deionized water, and the drying unit 29 is filled with dry silica gel.
As shown in FIG. 2, the testing system further comprises a seepage product recovery unit 31, the seepage product recovery unit 31 is connected with the seepage product output pipe 15, and the seepage product output pipe 15 is provided with a third pressure gauge 32 and a third valve 33. That is, after the third valve 33 is opened, the seepage product of the organic rock sample 5 enters the seepage product recovery device 31 through the seepage product output pipe 15 to be recovered, the third pressure gauge 32 is used for measuring the output pressure of the seepage product, that is, the third pressure gauge 32 can be used for judging whether the organic rock sample 5 is driven through, so as to determine the pore pressure of the core of the organic rock sample 5.
The organic rock in the invention comprises low-quality coal rock, rich-oil coal rock, oil shale and the like.
The invention relates to a working method of a test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock, which comprises the following steps:
the method comprises the following steps: flanging the upper end and the lower end of the clamping cylinder 4, and hermetically connecting the clamping cylinder 4 to the upper cover plate 2 and the lower cover plate 3 through a first connecting piece 6 and a second connecting piece 7, wherein a graphite sealing gasket is adopted for sealing the connection part; the lower end of the clamping cylinder 4 is sealed, water is injected into the clamping cylinder 4, the upper end of the clamping cylinder is sealed, a pressure gauge is additionally arranged, confining pressure load is applied to explore the pressure transmission characteristic of the clamping cylinder 4, and the appropriate wall thickness of the clamping cylinder 4 is determined; in this embodiment, the holding cylinder 4 is a T2 copper tube.
Step two: cutting irregular samples excavated underground into cylindrical organic rock samples 5 with various sizes (phi 50 multiplied by 100mm, phi 75 multiplied by 150mm, phi 80 multiplied by 160mm, phi 100 multiplied by 200mm and phi 150 multiplied by 300mm) by a sandstone wire cutting machine, and placing the samples in a clamping cylinder 4 with proper wall thickness for tight wrapping after surface polishing, drying and other pretreatment; the actual buried depth range of the organic rock sample 5 collected in this example is 0 to 2100m, and the ambient temperature range is 0 to 800 ℃.
Step three: the method comprises the following steps of placing a clamping cylinder 4 wrapping an organic rock sample 5 into a confining pressure cylinder 1, injecting oil into a lower side axial pressure pressurizing hydraulic cylinder by a hydraulic station 40, pushing the lower side hydraulic cylinder to prop a pressurizing pressing block 10 by high-pressure oil, propping the organic rock sample 5 in a pyrolysis reactor by the pressurizing pressing block 10 to apply axial pressure from the lower side, sealing the upper side of the organic rock sample 5 by an upper cover plate 2, injecting water into an annular channel 8, and heating water in the annular channel 8 to apply confining pressure load.
Step four: the hydraulic station 40 injects oil into the lower axial pressure pressurizing hydraulic cylinder to slowly apply axial pressure, the organic rock sample 5 stops acting after being pressurized to a certain degree, and a plurality of pore channels are drilled from the upper side of the organic rock sample 5 through the upper cover plate 2 and the pressure bearing block 9 and used for containing the inert gas input pipe 13 (convection flower pipe), the electric heating rod 12, the thermocouple 34 and the pyrolysis gas output pipe 14.
Step five: adjusting the pressure, monitoring seepage, opening a valve of an inert gas high-pressure storage tank 20, and injecting heated hot inert gas into the organic rock sample 5 through an inert gas input pipe 13 for fracturing; in this example, nitrogen was used as the inert gas.
Step six: stopping injecting hot inert gas, vacuumizing the annular channel 8, starting heating in the organic rock sample 5 by using the electric heating rod 12, and monitoring the pressure, seepage pressure and temperature change conditions in real time;
step seven: and (3) heating to the pyrolysis temperature, extracting oil gas through a pyrolysis gas recovery device, and collecting data of each monitor in the heating process.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock is characterized by comprising a confining pressure barrel (1), wherein an upper cover plate (2) and a lower cover plate (3) are respectively arranged at the top and the bottom of the confining pressure barrel (1), a clamping barrel (4) for clamping an organic rock sample (5) is arranged in the confining pressure barrel (1), the position, close to the top, of the clamping barrel (4) is in sealing detachable connection with the bottom of the upper cover plate (2) and the top of the confining pressure barrel (1) through a first connecting piece (6) which is communicated up and down, and the position, close to the bottom, of the clamping barrel (4) is in sealing detachable connection with the top of the lower cover plate (3) and the bottom of the confining pressure barrel (1) through a second connecting piece (7) which is communicated up and down; an annular channel (8) is formed between the confining pressure barrel (1) and the first connecting piece (6) and the clamping barrel (4), a liquid injection port (16) communicated with the annular channel (8) is formed in the side wall of the confining pressure barrel (1), and a heater (17) is further arranged on the side wall of the confining pressure barrel (1); a pressure bearing block (9) which is abutted against the lower end of the upper cover plate (2) and the upper end of the organic rock sample (5) is hermetically arranged in the first connecting piece (6), and an electric heating rod (12), an inert gas input pipe (13) and a pyrolysis gas output pipe (14) which penetrate through the pressure bearing block (9) and the upper cover plate (2) are arranged in the organic rock sample (5); the second connecting piece (7) internal seal is provided with a pressurizing pressing block (10), the lower end of the pressurizing pressing block (10) is connected with a pressurizing device (11) which penetrates through the lower cover plate (3), and a seepage product output pipe (15) which penetrates through the pressurizing pressing block (10) is arranged in the organic rock sample (5).
2. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, further comprising a heat exchanger (19), an inert gas high-pressure storage tank (20) and a plunger pump (21), wherein a steam unloading port (18) communicated with the annular channel (8) is further formed in the side wall of the confining pressure cylinder (1), the output end of the inert gas high-pressure storage tank (20) is connected with the first input end of the heat exchanger (19), the first output end of the heat exchanger (19) is connected with the inert gas input pipe (13), a first pressure gauge (22) is arranged on the inert gas input pipe (13), the steam unloading port (18) is connected with the second input end of the heat exchanger (19), and a first valve (23) is arranged between the steam unloading port (18) and the heat exchanger (19), and a second output end of the heat exchanger (19) is connected with an input end of the plunger pump (21), and an output end of the plunger pump (21) is connected with the liquid injection port (16).
3. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, further comprising a pyrolysis gas recovery device and a cooling separator (25), wherein the pyrolysis gas recovery device comprises an oil gas absorption unit (24) for absorbing oil gas in pyrolysis gas, a second pressure gauge (26) and a second valve (27) are arranged on the pyrolysis gas output pipe (14), the pyrolysis gas output pipe (14) is connected with an input end of the cooling separator (25), and an output end of the cooling separator (25) is connected with the oil gas absorption unit (24).
4. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 3, wherein the pyrolysis gas recovery device further comprises a filtering unit (28), a drying unit (29) and a pyrolysis gas recovery unit (30), the oil gas absorption unit (24) is connected with the filtering unit (28), the filtering unit (28) is connected with the drying unit (29), and the drying unit (29) is connected with the pyrolysis gas recovery unit (30).
5. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, further comprising a seepage product recovery device (31), wherein the seepage product recovery device (31) is connected with the seepage product output pipe (15), and a third pressure gauge (32) and a third valve (33) are arranged on the seepage product output pipe (15).
6. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, characterized in that a thermocouple (34) penetrating through the pressure bearing block (9) and the upper cover plate (2) is further arranged in the organic rock sample (5).
7. A test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, characterized in that a thermometer (35) for measuring the temperature in the annular channel (8), a fourth pressure gauge (36) for measuring the pressure in the annular channel (8) and a liquid level gauge (37) for measuring the liquid level in the annular channel (8) are further arranged on the side wall of the confining pressure cylinder (1).
8. The test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, wherein the clamping cylinder (4) is made of T2 red copper.
9. A test system for simulating in-situ pyrolysis oil extraction gas of underground organic rock according to claim 1, characterized by further comprising a bracket (38), wherein the upper cover plate (2) and the lower cover plate (3) are connected to the bracket (38), a bottom plate (39) is arranged at the bottom of the bracket (38), and the pressurizing device (11) is arranged on the bottom plate (39).
10. A method of operating a test system for simulating in situ pyrolysis gas stripping of underground organic rock as claimed in any one of claims 1 to 9, comprising:
controlling the pressurizing device (11) to apply a set axial load to the organic rock sample (5) in the clamping cylinder (4) through the pressurizing press block (10);
adding confining pressure liquid into the annular channel (8) through the liquid injection port (16), controlling the heater (17) to heat the confining pressure liquid to a set temperature, and applying confining pressure to the organic rock sample (5) in the clamping cylinder (4) by the heated confining pressure liquid;
inputting inert gas with set temperature into the organic rock sample (5) in the clamping cylinder (4) through the inert gas input pipe (13) to carry out convection heating on the organic rock sample (5), and measuring the seepage pressure of the seepage product output pipe (15);
controlling the electric heating rod (12) to electrically heat the organic rock sample (5) in the clamping cylinder (4);
after the pyrolysis gas is heated to the pyrolysis temperature, the pyrolysis gas is output through the pyrolysis gas output pipe (14) and oil gas in the pyrolysis gas is extracted.
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