Determination method of underground fuel deposition rate, reaction model and experimental device

Abstract

The invention relates to a method for determining an underground fuel deposition rate, which comprises the following steps of: putting a rock core and high-temperature-resistant cement into a model pipe to prepare a reaction model; the reaction model is placed in the RTO tubular furnace, the reaction model is connected with a gas inlet pipe and a gas outlet pipe, the gas inlet pipe of the reaction model is connected with a first gas cylinder and a second gas cylinder, and the gas outlet pipe of the reaction model is connected with a gas-liquid separation device and a flue gas analyzer; a control valve of the second gas cylinder is opened, a control valve of the first gas cylinder is closed, and gas in the second gas cylinder enters the reaction model; the control valve of the second gas cylinder is closed, the control valve of the first gas cylinder is opened, gas in the first gas cylinder enters the reaction model, the RTO tubular furnace is started, and heating is stopped after the temperature is increased to the preset temperature; calculating fuel consumption according to the volumes of carbon dioxide and carbon monoxide measured by the flue gas analyzer; and measuring the amount of liquid crude oil collected in the gas-liquid separation device after heating is stopped, and calculating the fuel deposition rate based on the amount of the liquid crude oil and the fuel consumption.

Description

Technical Field

[0001] This application relates to the field of laboratory fire research technology, and in particular to a method for determining the underground fuel deposition rate, as well as a reaction model and experimental apparatus for determining the underground fuel deposition rate. Background Technology

[0002] Fire-driven oil recovery is an important thermal oil recovery technology. The most crucial aspect of fire-driven extraction is the formation of a stable combustion front, which depends on whether the combustion deposition reaches or exceeds the minimum critical value for fire-driven extraction. Therefore, measuring fuel deposition is of paramount importance.

[0003] In related technologies, fuel deposition is mainly measured using combustion tubes and RTO (Regenerative Thermal Oxidizer) experimental methods. The inventors have discovered at least the following technical problems in these technologies: These methods all use sand-filled models to simulate the temperature and pressure conditions of the oil reservoir during the experimental process. However, under high temperature and high pressure conditions, this traditional sand-filled model exhibits large voids, causing gas leakage during the experiment. This results in unreacted gas leaking out through the voids, leading to disordered experimental data and large errors. Summary of the Invention

[0004] This application provides a method for determining the underground fuel deposition rate, as well as a reaction model and experimental apparatus for determining the underground fuel deposition rate.

[0005] In a first aspect, this application provides a method for determining the underground fuel deposition rate. The method includes: inserting a core and high-temperature resistant cement into a model tube to form a reaction model; placing the reaction model in an RTO tubular furnace, the reaction model being connected to an inlet pipe and an outlet pipe, the inlet pipe of the reaction model being connected to a first gas cylinder and a second gas cylinder, and the outlet pipe of the reaction model being connected to a gas-liquid separation device and a flue gas analyzer; wherein, the output ends of the first gas cylinder and the second gas cylinder are each equipped with a control valve; opening the control valve of the second gas cylinder and closing the control valve of the first gas cylinder, allowing the gas inside the second gas cylinder to enter the reaction model; closing the control valve of the second gas cylinder and opening the control valve of the first gas cylinder, allowing the gas inside the first gas cylinder to enter the reaction model; starting the RTO tubular furnace, heating to a preset temperature, and then stopping heating; calculating the fuel consumption based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer; measuring the amount of liquid crude oil collected in the gas-liquid separation device after heating is stopped, and calculating the fuel deposition rate based on the amount of liquid crude oil and the fuel consumption.

[0006] As an optional implementation, the step of inserting a rock core and high-temperature resistant cement into a model tube to form a reaction model includes: placing the rock core at the center of the model tube, allowing gas to enter the rock core through the air inlet pipe and flow out through the air outlet pipe, and filling the space between the rock core and the inner wall of the model tube with high-temperature resistant cement until the model tube is completely filled.

[0007] As an optional implementation, the model further includes a filling material. The step of filling the model tube with a rock core and high-temperature resistant cement to form a reaction model includes: filling the bottom of the model tube with the filling material, placing the rock core on top of the filling material at the bottom of the model tube, filling the space between the rock core and the inner wall of the model tube with high-temperature resistant cement, and filling the model tube with the filling material until the model tube is full.

[0008] As an optional implementation, the fuel consumption is calculated using the following formula (1), and the fuel deposition rate is calculated using the following formula (2):

[0009]

[0010]

[0011] Where Vco2 represents the volume of carbon dioxide, Vco represents the volume of carbon monoxide, m1 represents the amount of liquid crude oil, m2 represents the fuel consumption, and m3 represents the fuel deposition rate.

[0012] As an optional implementation, the first gas cylinder is filled with air, and the second gas cylinder is filled with nitrogen.

[0013] As an alternative implementation, the model tube is made of at least one of the following materials: stainless steel, titanium alloy, and Hastelloy.

[0014] As an optional implementation, the preset temperature is 600-700 degrees Celsius.

[0015] Secondly, this application provides a reaction model for determining the underground fuel deposition rate. The reaction model includes a model tube, a core, high-temperature resistant cement, and a filling material. The core is located at the center of the filling material at the bottom of the model tube. The high-temperature resistant cement is filled between the inner wall of the model tube and the core. The reaction model is used to implement the above-mentioned method for determining the underground fuel deposition rate.

[0016] Thirdly, this application provides an experimental apparatus for determining the underground fuel deposition rate, comprising the aforementioned reaction model for determining the underground fuel deposition rate, an RTO tubular furnace, a gas-liquid separation device, a flue gas analyzer, a first gas cylinder, and a second gas cylinder; the reaction model is located inside the RTO tubular furnace, and the reaction model is connected to an inlet pipe and an outlet pipe; the first gas cylinder and the second gas cylinder are respectively connected to the inlet pipe of the reaction model, and the outlet pipe of the reaction model is sequentially connected to the gas-liquid separation device and the flue gas analyzer; wherein, the gas-liquid separation device is used to collect liquid crude oil during the experiment, and the flue gas analyzer is used to measure the volume of carbon dioxide and the volume of carbon monoxide, to calculate the fuel consumption based on the volume of carbon dioxide and the volume of carbon monoxide, and to calculate the fuel deposition rate based on the amount of liquid crude oil and the fuel consumption.

[0017] As an optional implementation, the experimental apparatus for determining the underground fuel deposition rate further includes a data processing module, which is used to calculate the fuel consumption based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer, and to calculate the fuel deposition rate based on the amount of liquid crude oil measured by the gas-liquid separation device and the fuel consumption.

[0018] The technical solutions provided in this application have the following advantages compared with the prior art:

[0019] The method for determining the underground fuel deposition rate provided in this application effectively solves the technical problems in related technologies, such as gas channeling during the experiment caused by traditional sand-filling models, resulting in gas leakage from gaps and disordered experimental data. It realizes the simulation of on-site reservoir conditions, greatly reduces experimental errors, and can calculate the underground fuel deposition rate more accurately.

[0020] The method for determining the underground fuel deposition rate, the reaction model for determining the underground fuel deposition rate, and the experimental device provided in this application embodiment all use real rock cores, whose oil and water content, trace minerals, etc. are consistent with those of the field oilfield. The reaction model adopts a high-temperature resistant filled and sealed structure, which eliminates the gap between the reactor and the rock core, avoids gas leakage, and ensures that the gas and the rock core react fully in the experiment, so as to obtain accurate experimental data and thus obtain a more accurate fuel deposition rate. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart illustrating a method for determining the underground fuel deposition rate according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a reaction model according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram illustrating the preparation process of a reaction model according to another embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of an experimental apparatus for determining the underground fuel deposition rate according to another embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in this application can be purchased commercially or prepared using existing methods. This addresses the technical problem in related technologies where traditional sand-filled models cause gas leakage during experiments, resulting in unreacted gas loss from voids and distorted experimental data with large errors. This approach simulates actual reservoir conditions, avoids gas leakage, obtains accurate experimental data, and consequently yields a more accurate fuel deposition rate, reducing experimental errors.

[0029] The first aspect of this application discloses a method for determining the underground fuel deposition rate.

[0030] Example 1:

[0031] Figure 1 This is a flowchart illustrating a method for determining the underground fuel deposition rate according to an embodiment of the present invention; as shown. Figure 1 As shown in the embodiment of this application, a method for determining the underground fuel deposition rate is provided, the method comprising:

[0032] S1, a rock core and high-temperature resistant cement are inserted into the model tube to make a reaction model;

[0033] S2, the reaction model is placed inside an RTO tube furnace. The reaction model is connected to an inlet pipe and an outlet pipe. The inlet pipe of the reaction model is connected to a first gas cylinder and a second gas cylinder. The outlet pipe of the reaction model is connected to a gas-liquid separator and a flue gas analyzer. Control valves are provided at the output ends of the first gas cylinder and the second gas cylinder.

[0034] S3, open the control valve of the second gas cylinder and close the control valve of the first gas cylinder, and the gas inside the second gas cylinder enters the reaction model;

[0035] S4, close the control valve of the second gas cylinder, open the control valve of the first gas cylinder, the gas inside the first gas cylinder enters the reaction model, start the RTO tube furnace, and stop heating after heating to the preset temperature;

[0036] S5. Calculate the fuel consumption based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer.

[0037] S6, Measure the amount of liquid crude oil collected in the gas-liquid separation device after heating is stopped, and calculate the fuel deposition rate based on the amount of liquid crude oil and the fuel consumption.

[0038] Figure 2 This is a schematic diagram of the structure of a reaction model according to an embodiment of the present invention.

[0039] In step S1, a rock core and high-temperature resistant cement are placed inside a model tube to create a reaction model. This includes placing the rock core at the center of the model tube, allowing gas to enter the rock core through the inlet pipe and exit through the outlet pipe, and filling the space between the rock core and the inner wall of the model tube with high-temperature resistant cement until the model tube is completely filled. The resulting reaction model is as follows: Figure 2 As shown.

[0040] Specifically, the core samples used in the experiment can be oil reservoir extraction core samples, whose oil and water content, trace minerals, etc. are consistent with those of the actual oil field. They can characterize the influence of changes in porosity and permeability and clay distribution characteristics in the real oil reservoir, thereby simulating the real oil reservoir conditions to the greatest extent possible in the experiment.

[0041] Before preparing the reaction model, the core can be cut using a core preparer, for example, into cylinders 300mm long and 10mm in diameter, with a volume smaller than the reactor volume. The above scheme employs a high-temperature resistant, filled, and sealed structure to ensure the actual core fits tightly inside the reactor, eliminating gaps between the reactor and the core, preventing gas leakage, and ensuring sufficient gas-core reaction during the experiment. High-temperature glue can maintain a seal between the core and the inner wall of the model at 600-700 degrees Celsius, preventing gaps that could allow gas to escape. Even if the model tube undergoes some deformation under high-temperature conditions, such as bending of stainless steel at 600-700 degrees Celsius, the high-temperature glue can still maintain a seal between the core and the inner wall, preventing gaps that could allow gas to escape. This ensures that the flowing gas can fully contact the core, react completely, and then flow out. High-temperature glue can be made from aluminosilicates, inorganic ceramics, and other components.

[0042] In step S3, gas from the second gas cylinder enters the reaction model, simulating the pressure conditions of an on-site oilfield. The gas introduced into the second gas cylinder displaces some of the crude oil, and liquid crude oil is collected in the gas-liquid separator. In one possible implementation, step S3 opens the control valve of the second gas cylinder and closes the first gas cylinder. The gas-liquid separator collects liquid crude oil until no more liquid crude oil is collected. Then, the control valve of the second gas cylinder is closed, the experiment is paused, and the system returns to a standby state, with both the control valves of the first and second gas cylinders closed.

[0043] In step S4, the experiment is started by activating the first gas cylinder, closing the control valve of the second gas cylinder, and opening the control valve of the first gas cylinder. The gas inside the first gas cylinder enters the reaction model, and the RTO tube furnace is activated, heating to a preset temperature at a rate of 10 kJ / min. The preset temperature can be 600-700 degrees Celsius. For example, the heating rate can be 2-10 kJ / min, which can be determined based on the specific experimental conditions.

[0044] In S5 and S6, the fuel consumption is calculated using the following formula (1):

[0045]

[0046] The fuel deposition rate is calculated using the following formula (2):

[0047]

[0048] Where Vco2 represents the volume of carbon dioxide, Vco represents the volume of carbon monoxide, m1 represents the amount of liquid crude oil, m2 represents the fuel consumption, and m3 represents the fuel deposition rate. The fuel deposition rate in this embodiment reflects the proportion of oil consumed during the experimental process, providing a key parameter for the early stages of fire-driven extraction in indoor experiments measuring underground fuel deposition. For example, the gas in the first cylinder can be air, and the gas in the second cylinder can be nitrogen.

[0049] Furthermore, based on the above data, by comparing the ratios of each quantity and the percentages of each part, the values ​​of combustion deposition, evaporation, and oil production under oilfield conditions can be calculated.

[0050] The technical solutions provided in this application have the following advantages compared with the prior art:

[0051] The method for determining the underground fuel deposition rate provided in this application effectively solves the technical problems in related technologies, such as gas channeling during the experiment caused by traditional sand-filling models, resulting in gas leakage from gaps and disordered experimental data. It realizes the simulation of on-site reservoir conditions, greatly reduces experimental errors, and can calculate the underground fuel deposition rate more accurately.

[0052] The method for determining the underground fuel deposition rate, the reaction model for determining the underground fuel deposition rate, and the experimental device provided in this application embodiment all use real rock cores, whose oil and water content, trace minerals, etc. are consistent with those of the field oilfield. The reaction model adopts a high-temperature resistant filled and sealed structure, which eliminates the gap between the reactor and the rock core, avoids gas leakage, and ensures that the gas and the rock core react fully in the experiment, so as to obtain accurate experimental data and thus obtain a more accurate fuel deposition rate.

[0053] Example 2:

[0054] Figure 1 This is a flowchart illustrating a method for determining the underground fuel deposition rate according to an embodiment of the present invention; as shown. Figure 1 As shown in the embodiment of this application, a method for determining the underground fuel deposition rate is provided, the method comprising:

[0055] S1, a rock core and high-temperature resistant cement are inserted into the model tube to make a reaction model;

[0056] S2, the reaction model is placed inside an RTO tube furnace. The reaction model is connected to an inlet pipe and an outlet pipe. The inlet pipe of the reaction model is connected to a first gas cylinder and a second gas cylinder. The outlet pipe of the reaction model is connected to a gas-liquid separator and a flue gas analyzer. Control valves are provided at the output ends of the first gas cylinder and the second gas cylinder.

[0057] S3, open the control valve of the second gas cylinder and close the control valve of the first gas cylinder, and the gas inside the second gas cylinder enters the reaction model;

[0058] S4, close the control valve of the second gas cylinder, open the control valve of the first gas cylinder, the gas inside the first gas cylinder enters the reaction model, start the RTO tube furnace, and stop heating after heating to the preset temperature;

[0059] S5. Calculate the fuel consumption based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer.

[0060] S6, Measure the amount of liquid crude oil collected in the gas-liquid separation device after heating is stopped, and calculate the fuel deposition rate based on the amount of liquid crude oil and the fuel consumption.

[0061] Figure 3 This is a schematic diagram of the preparation process of a reaction model according to another embodiment of the present invention.

[0062] In step S1, the model further includes a filling material. The step of inserting a rock core and high-temperature resistant cement into the model tube to form a reaction model includes: filling the bottom of the model tube with the filling material, placing the rock core on top of the filling material at the bottom of the model tube, filling the space between the rock core and the inner wall of the model tube with high-temperature resistant cement, and filling the model tube with the filling material until the model tube is full.

[0063] like Figure 3 As shown, (a) represents an empty model tube, (b) represents filling the bottom of the model tube with filler material, (c) represents placing the core on top of the filler material at the bottom of the model tube, (d) represents filling the space between the core and the inner wall of the model tube with high-temperature resistant cement, and (e) represents filling the model tube with filler material until it is completely filled. Optionally, the filler material can be quartz sand.

[0064] Specifically, the core samples used in the experiment can be oil reservoir extraction core samples, whose oil and water content, trace minerals, etc. are consistent with those of the actual oil field. They can characterize the influence of changes in porosity and permeability and clay distribution characteristics in the real oil reservoir, thereby simulating the real oil reservoir conditions to the greatest extent possible in the experiment.

[0065] Before preparing the reaction model, the core can be cut using a core preparer, for example, into cylinders 300mm long and 10mm in diameter, with a volume smaller than the reactor volume. The above scheme employs a high-temperature resistant, filled, and sealed structure to ensure the actual core fits tightly inside the reactor, eliminating gaps between the reactor and the core, preventing gas leakage, and ensuring sufficient gas-core reaction during the experiment. High-temperature glue can maintain a seal between the core and the inner wall of the model at 600-700 degrees Celsius, preventing gaps that could allow gas to escape. Even if the model tube undergoes some deformation under high-temperature conditions, such as bending of stainless steel at 600-700 degrees Celsius, the high-temperature glue can still maintain a seal between the core and the inner wall, preventing gaps that could allow gas to escape. This ensures that the flowing gas can fully contact the core, react completely, and then flow out. High-temperature glue can be made from aluminosilicates, inorganic ceramics, and other components.

[0066] In step S3, gas from the second gas cylinder enters the reaction model, simulating the pressure conditions of an on-site oilfield. The gas introduced into the second gas cylinder displaces some of the crude oil, and liquid crude oil is collected in the gas-liquid separator. In one possible implementation, step S3 opens the control valve of the second gas cylinder and closes the first gas cylinder. The gas-liquid separator collects liquid crude oil until no more liquid crude oil is collected. Then, the control valve of the second gas cylinder is closed, the experiment is paused, and the system returns to a standby state, with both the control valves of the first and second gas cylinders closed.

[0067] In step S4, the experiment is started by activating the first gas cylinder, closing the control valve of the second gas cylinder, and opening the control valve of the first gas cylinder. The gas inside the first gas cylinder enters the reaction model, and the RTO tube furnace is activated, heating to a preset temperature at a rate of 10 kJ / min. The preset temperature can be 600-700 degrees Celsius. For example, the heating rate can be 2-10 kJ / min, which can be determined based on the specific experimental conditions.

[0068] In S5 and S6, the fuel consumption is calculated using the following formula (1):

[0069]

[0070] The fuel deposition rate is calculated using the following formula (2):

[0071]

[0072] Where Vco2 represents the volume of carbon dioxide, Vco represents the volume of carbon monoxide, m1 represents the amount of liquid crude oil, m2 represents the fuel consumption, and m3 represents the fuel deposition rate. The fuel deposition rate in this embodiment reflects the proportion of oil consumed during the experimental process, providing a key parameter for the early stages of fire-driven extraction in indoor experiments measuring underground fuel deposition. For example, the gas in the first cylinder can be air, and the gas in the second cylinder can be nitrogen.

[0073] Furthermore, based on the above data, by comparing the ratios of each quantity and the percentages of each part, the values ​​of combustion deposition, evaporation, and oil production under oilfield conditions can be calculated.

[0074] The second aspect of this application discloses a reaction model for determining the underground fuel deposition rate. The reaction model includes a model tube, a core, high-temperature resistant cement, and a filling material. The core is located at the center of the filling material at the bottom of the model tube. The high-temperature resistant cement fills the space between the inner wall of the model tube and the core. The reaction model is used to implement a method for determining the underground fuel deposition rate. For details, please refer to the above embodiments. Since this reaction model adopts some or all of the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0075] The technical solutions provided in this application have the following advantages compared with the prior art:

[0076] The method for determining the underground fuel deposition rate provided in this application effectively solves the technical problems in related technologies, such as gas channeling during the experiment caused by traditional sand-filling models, resulting in gas leakage from gaps and disordered experimental data. It realizes the simulation of on-site reservoir conditions, greatly reduces experimental errors, and can calculate the underground fuel deposition rate more accurately.

[0077] The method for determining the underground fuel deposition rate, the reaction model for determining the underground fuel deposition rate, and the experimental device provided in this application embodiment all use real rock cores, whose oil and water content, trace minerals, etc. are consistent with those of the field oilfield. The reaction model adopts a high-temperature resistant filled and sealed structure, which eliminates the gap between the reactor and the rock core, avoids gas leakage, and ensures that the gas and the rock core react fully in the experiment, so as to obtain accurate experimental data and thus obtain a more accurate fuel deposition rate.

[0078] Example 3:

[0079] Figure 4 This is a schematic diagram of an experimental apparatus for determining the underground fuel deposition rate according to another embodiment of the present invention.

[0080] A third aspect of this application discloses an experimental apparatus for determining the underground fuel deposition rate, comprising the aforementioned reaction model for determining the underground fuel deposition rate, an RTO tubular furnace, a gas-liquid separation device, a flue gas analyzer, a first gas cylinder, and a second gas cylinder; the reaction model is located inside the RTO tubular furnace, and the reaction model is connected to an inlet pipe and an outlet pipe; the first gas cylinder and the second gas cylinder are respectively connected to the inlet pipe of the reaction model, and the outlet pipe of the reaction model is sequentially connected to the gas-liquid separation device and the flue gas analyzer; wherein, the gas-liquid separation device is used to collect liquid crude oil during the experiment, and the flue gas analyzer is used to measure the volume of carbon dioxide and the volume of carbon monoxide, to calculate the fuel consumption based on the volume of carbon dioxide and the volume of carbon monoxide, and to calculate the fuel deposition rate based on the amount of liquid crude oil and the fuel consumption.

[0081] As an optional implementation, the experimental apparatus for determining the underground fuel deposition rate further includes a data processing module, which is used to calculate the fuel consumption based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer, and to calculate the fuel deposition rate based on the amount of liquid crude oil measured by the gas-liquid separation device and the fuel consumption.

[0082] like Figure 4 As shown, in one possible implementation, the experimental setup includes the aforementioned reaction model for determining underground fuel deposition rate, RTO tubular furnace, gas-liquid separator, flue gas analyzer, first and second gas cylinders, data processing module, and other experimentally related equipment, such as flow meters, back pressure valves, and desiccants. The data processing module may include a computer or other equipment for instrument control, information acquisition, data processing, and data interaction.

[0083] Based on a general inventive concept, the experimental apparatus of the embodiments of this application can be used to implement the method for determining the underground fuel deposition rate of the aforementioned embodiments. The specific content of the method can be referred to the above embodiments. Since some or all of the technical solutions of the above embodiments are adopted, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0084] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then general international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0085] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0086] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in the description of this application, terms such as "comprising" and "including" mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0087] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for determining the underground fuel deposition rate, characterized in that, The method includes: A rock core and high-temperature resistant cement are inserted into a model tube to create a reaction model; The reaction model is placed inside an RTO tube furnace. The reaction model is connected to an inlet pipe and an outlet pipe. The inlet pipe of the reaction model is connected to a first gas cylinder and a second gas cylinder. The outlet pipe of the reaction model is connected to a gas-liquid separator and a flue gas analyzer. Control valves are provided at the output ends of the first gas cylinder and the second gas cylinder. Open the control valve of the second gas cylinder and close the control valve of the first gas cylinder, so that the gas inside the second gas cylinder enters the reaction model; Close the control valve of the second gas cylinder, open the control valve of the first gas cylinder, and the gas inside the first gas cylinder enters the reaction model. Start the RTO tube furnace, heat up to the preset temperature, and then stop heating. The fuel consumption is calculated based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer. The amount of liquid crude oil collected in the gas-liquid separator after heating is stopped is measured, and the fuel deposition rate is calculated based on the amount of liquid crude oil and the amount of fuel consumed.

2. The method for determining the underground fuel deposition rate according to claim 1, characterized in that, The process of inserting a rock core and high-temperature resistant cement into a model tube to create a reaction model includes: The core is placed at the center of the model tube, allowing gas to enter the core through the inlet pipe and exit through the outlet pipe. High-temperature resistant cement is then filled between the core and the inner wall of the model tube until the model tube is completely filled.

3. The method for determining the underground fuel deposition rate according to claim 1, characterized in that, The model also includes a filling material, wherein the process of inserting a rock core and high-temperature resistant cement into the model tube to create a reaction model includes: Fill the bottom of the model tube with filler material, place the core on top of the filler material at the bottom of the model tube, fill the space between the core and the inner wall of the model tube with high-temperature resistant cement, and fill the model tube with filler material until it is full.

4. The method for determining the underground fuel deposition rate according to claim 1, characterized in that, Fuel consumption is calculated using the following formula (1): The fuel deposition rate is calculated using the following formula (2): Where Vco2 represents the volume of carbon dioxide, Vco represents the volume of carbon monoxide, m1 represents the amount of liquid crude oil, m2 represents the fuel consumption, and m3 represents the fuel deposition rate.

5. The method for determining the underground fuel deposition rate according to claim 1, characterized in that, The first gas cylinder is filled with air, and the second gas cylinder is filled with nitrogen.

6. The method for determining the underground fuel deposition rate according to claim 1, characterized in that, The model tube is made of at least one of the following materials: stainless steel, titanium alloy, and Hastelloy.

7. The method for determining the underground fuel deposition rate according to claim 1, characterized in that, The preset temperature is 600-700 degrees Celsius.

8. A reaction model for determining the deposition rate of underground fuels, characterized in that, The reaction model includes a model tube, a core, high-temperature resistant cement, and a filling material. The core is located at the center of the filling material at the bottom of the model tube. The high-temperature resistant cement is filled between the inner wall of the model tube and the core. The reaction model is used to implement the method for determining the underground fuel deposition rate as described in any one of claims 1 to 7.

9. An experimental apparatus for determining the deposition rate of underground fuel, characterized in that, The system includes, as described in claim 8, a reaction model for determining underground fuel deposition rate, an RTO tubular furnace, a gas-liquid separator, a flue gas analyzer, a first gas cylinder, and a second gas cylinder; the reaction model is located inside the RTO tubular furnace, the reaction model is connected to an inlet pipe and an outlet pipe, the first gas cylinder and the second gas cylinder are respectively connected to the inlet pipe of the reaction model, and the outlet pipe of the reaction model is sequentially connected to the gas-liquid separator and the flue gas analyzer; The gas-liquid separation device is used to collect liquid crude oil during the experiment, and the flue gas analyzer is used to measure the volume of carbon dioxide and carbon monoxide to calculate the fuel consumption based on the volume of carbon dioxide and carbon monoxide. Based on the amount of liquid crude oil and the fuel consumption, the fuel deposition rate is calculated.

10. The experimental apparatus for determining the underground fuel deposition rate according to claim 9, characterized in that, It also includes a data processing module, which is used to calculate fuel consumption based on the volume of carbon dioxide and carbon monoxide measured by the flue gas analyzer, and to calculate fuel deposition rate based on the amount of liquid crude oil measured by the gas-liquid separator and the fuel consumption.

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