Method and device for determining the action distance of a catalytic upgrading system in a porous medium

Abstract

The application relates to the technical field of super-heavy oil reservoir development, and discloses a method and device for measuring the action distance of a catalytic upgrading system in a porous medium and a storage medium. The method comprises the following steps: constructing a porous medium physical model simulating the physical characteristics of a reservoir, the physical model being provided with a plurality of sampling points along the length direction of the physical model; establishing bound water in the physical model and saturating a target oil sample; injecting a preset amount of catalytic upgrading system solution into the physical model, and making the catalytic upgrading system solution and the target oil sample undergo an upgrading reaction under a preset reaction temperature condition; driving the upgraded oil sample to migrate along the physical model, and collecting upgraded oil samples at different migration distances at the plurality of sampling points; measuring the physical parameters of the collected upgraded oil samples, establishing a graph of the change of the upgrading effect of the catalytic upgrading system solution in the physical model with the distance according to the physical parameters; and determining the effective action distance of the catalytic upgrading system solution in the porous medium based on the graph according to a preset target value of the upgrading effect.

Description

Technical Field

[0001] This application relates to the field of extra-heavy oil reservoir development technology, and discloses a method, apparatus and storage medium for determining the action distance of a catalytic reforming system in a porous medium. Background Technology

[0002] Heavy oil resources hold a significant position in global oil and gas resources, but their high viscosity leads to poor fluidity and makes conventional extraction difficult. Catalytic reforming technology, which involves injecting a catalyst and hydrogen donor system into the reservoir porous medium, enables in-situ catalytic reactions in heavy oil, achieving irreversible viscosity reduction. This has become a research hotspot in the field of heavy oil development, and the effective action distance of the catalytic reforming system is a key parameter for evaluating its application effect. This distance refers to the maximum transport distance that the catalyst and hydrogen donor can maintain effective reforming capacity during migration in the reservoir porous medium, directly determining the optimized design of the injection well spacing and the selection of process parameters for the reforming scheme.

[0003] In existing technologies, the evaluation of the effect distance of catalytic reforming systems mainly adopts the following two methods: one is to determine the viscosity reduction effect of the catalytic reforming system through static reactor experiments, and directly use the reactor experiment results as the effect under reservoir conditions; the other is to collect reformed oil samples at the outlet end of the sand-filled tube through a single outlet displacement experiment, and use the viscosity reduction rate at the outlet end to represent the average reforming effect of the entire core.

[0004] However, among the above evaluation methods, the static reactor experiment cannot simulate the adsorption, retention and concentration decay process of the catalytic reforming system during its migration in porous media, and the viscosity reduction rate measured by it cannot represent the true effect of the reforming system after decay along the process under actual reservoir conditions; the single outlet end evaluation method can only obtain the final effect of the reforming system after its action, and cannot obtain the decay law of the reforming effect with the migration distance, let alone determine the limit distance at which the reforming system can maintain effective reforming capacity in porous media.

[0005] Therefore, how to accurately determine the effective action distance of the catalytic reforming system in porous media and establish a quantitative relationship between the reforming effect and the transport distance has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this application is to overcome the problems of the decay of the catalytic reforming effect of the catalytic reforming system in porous media with the transport distance and the difficulty in accurately measuring the effective action distance in the existing technology, and to provide a method, device and storage medium for measuring the action distance of the catalytic reforming system in porous media.

[0007] To achieve the above objectives, the present invention provides a method for determining the interaction distance of a catalytic reforming system in a porous medium, the method comprising: A porous medium physical model simulating the physical properties of the reservoir was constructed, with multiple sampling points along its length. Binding water was created in the physical model and the target oil sample was saturated. A preset amount of catalytic reforming system solution is injected into the physical model, and the catalytic reforming system solution reacts with the target oil sample under a preset reaction temperature condition. The modified oil sample was driven to migrate along the physical model, and modified oil samples were collected at different migration distances at multiple sampling points. The physical properties of the collected modified oil samples were measured, and a graph showing the modification effect of the catalytic modification system solution in the physical model as a function of distance was established based on the physical properties. Based on the preset target value of the reforming effect, the effective interaction distance of the catalytic reforming system solution in the porous medium is determined using the chart.

[0008] In this embodiment of the application, establishing bound water in the physical model and saturating the target oil sample includes: evacuating the physical model and saturating it with formation water to determine its pore volume; and injecting the target oil sample into the physical model using an oil-drive water method until the bound water saturation is established.

[0009] In this embodiment of the application, the physical property parameters of the collected modified oil samples include at least the viscosity reduction rate. Based on the physical property parameters, a graph showing the modification effect of the catalytic modification system solution in the physical model as a function of distance is established, including: measuring the viscosity of the modified oil sample at each sampling point, calculating the viscosity reduction rate corresponding to each sampling point based on the viscosity; and fitting and establishing a graph showing the viscosity reduction rate as a function of distance based on the axial distance of each sampling point from the inlet of the physical model and its corresponding viscosity reduction rate.

[0010] In this embodiment of the application, the effective action distance of the catalytic reforming system solution in the porous medium is determined based on a chart according to a preset target value for reforming effect. This includes: setting a target viscosity reduction rate; substituting the target viscosity reduction rate into the chart to determine the distance corresponding to the target viscosity reduction rate, which is the effective action distance of the catalytic reforming system solution in the porous medium.

[0011] In this embodiment of the application, a porous media physical model simulating the physical properties of a reservoir is constructed. The physical model has multiple sampling points along its length, including: selecting quartz sand of different mesh sizes and mixing them according to the physical property parameters of the target reservoir; filling the mixed quartz sand into a sand-filling pipe and compacting it to construct a porous media physical model, and measuring its permeability to verify whether it meets the physical property parameters of the target reservoir; wherein, multiple sampling ports are preset along the length of the sand-filling pipe, and the multiple sampling ports are distributed at unequal or equal intervals along the axial direction of the sand-filling pipe.

[0012] In this embodiment, a preset amount of catalytic reforming system solution is injected into a physical model, and the catalytic reforming system solution reacts with the target oil sample under a preset reaction temperature condition. This includes: preparing a catalytic reforming system solution by mixing a catalyst and a hydrogen donor in a preset ratio; injecting a preset amount of catalytic reforming system solution into the physical model, the preset amount being a multiple of a preset pore volume; setting the ambient temperature to the preset temperature required for the catalytic reforming reaction; and allowing the reaction to stand at a constant temperature for a preset time.

[0013] In this embodiment of the application, the modified oil sample is driven to move along the physical model, and modified oil samples at different moving distances are collected at multiple sampling points, including: injecting driving fluid into the inlet of the physical model to push the modified oil sample to move along the physical model to the outlet; opening multiple sampling points along the physical model in a preset order, and collecting a preset volume of modified oil sample at each sampling point.

[0014] The second aspect of this application provides a device for measuring the interaction distance of a catalytic reforming system in a porous medium, the device comprising: The memory is configured to store instructions; and The processor is configured to execute a method for determining the interaction distance of a catalytically modified system in a porous medium according to any one of the above.

[0015] In this embodiment of the application, the apparatus further includes: A sand-filled pipe is used to construct a porous media physical model simulating the physical properties of the reservoir. Multiple sampling points are located along the length of the physical model. An injection pump, a heavy oil piston container, a six-way valve, and the sand-filled pipe work together to establish bound water within the physical model and saturate the target oil sample. Another injection pump, a catalytic reforming system piston container, a six-way valve, and the sand-filled pipe work together to inject a predetermined amount of catalytic reforming system solution into the physical model and induce a reforming reaction between the catalytic reforming system solution and the target oil sample at a predetermined reaction temperature. A third injection pump, a hot water piston container, a six-way valve, and the sand-filled pipe work together to drive the reformed oil sample along the physical model and collect reformed oil samples at different transport distances from multiple sampling points. A viscosity measurement and data processing device is used to measure the physical properties of the collected reformed oil samples and establish a graph showing the reforming effect of the catalytic reforming system solution in the physical model as a function of distance based on these properties. Finally, an action distance determination device is used to determine the effective action distance of the catalytic reforming system solution in the porous media based on a predetermined target reforming effect value and the graph.

[0016] A third aspect of this application provides a machine-readable storage medium storing instructions for causing a machine to perform a method for determining the action distance of a catalytic reforming system in a porous medium according to any one of the preceding claims.

[0017] The above technical solution constructs a porous media physical model simulating reservoir physical properties and sets multiple sampling points along its path. After establishing bound water and saturating the target oil sample in the physical model, a catalytic reforming system solution is injected to initiate the reforming reaction. This drives the migration of the reformed oil sample, and reformed oil samples are collected at different migration distances from multiple sampling points. The physical properties of the reformed oil samples are measured, and a graph showing the reforming effect as a function of distance is established. Based on the preset target reforming effect value and the graph, the effective action distance of the catalytic reforming system in the porous media is determined. This enables the visualization and quantification of the reforming effect's decay along the path, accurately determining the limit distance at which the catalytic reforming system maintains its effective reforming capacity. This provides a scientific basis for optimizing injection well spacing and selecting process parameters for reforming schemes.

[0018] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings: Figure 1 The schematic diagram illustrates a process flow diagram of a method for determining the interaction distance of a catalytic reforming system in porous media according to an embodiment of this application; Figure 2 The schematic diagram illustrates a process flow diagram of a method for determining the interaction distance of a catalytic reforming system in porous media according to another embodiment of this application; Figure 3 This illustration schematically shows a device for measuring the interaction distance of a catalytic reforming system in a porous medium according to an embodiment of this application. Figure 4a The diagram illustrates the viscosity reduction rate variation curve of Experiment 1 according to an embodiment of this application. Figure 4b A schematic diagram illustrating viscosity reduction along the core sample of Experiment 1 according to an embodiment of this application is shown. Figure 5a The diagram illustrates the viscosity reduction rate variation curve of Experiment 2 according to an embodiment of this application. Figure 5b A schematic diagram illustrating viscosity reduction along the core sample of Experiment 2 according to an embodiment of this application is shown. Figure 6 The diagram illustrates the internal structure of a computer device according to an embodiment of this application. Detailed Implementation

[0020] 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. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] It should be noted that if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] Figure 1 The illustration shows a schematic flow diagram of a method for determining the interaction distance of a catalytic reforming system in porous media according to an embodiment of this application. Figure 1 As shown in one embodiment of this application, a method for determining the interaction distance of a catalytic reforming system in a porous medium is provided, comprising the following steps: Step 101: Construct a porous medium physical model to simulate the physical properties of the reservoir. The physical model has multiple sampling points along its length.

[0023] A porous media physical model is a physical model that simulates the pore structure and seepage characteristics of underground rocks by screening and filling similar materials such as quartz sand based on the real physical properties of the target reservoir.

[0024] In one embodiment, a porous media physical model simulating the physical properties of a reservoir is constructed. The physical model has multiple sampling points along its length. The process includes: researchers selecting quartz sand of different mesh sizes and mixing them according to the physical properties of the target reservoir; filling the mixed quartz sand into a sand-filling pipe and compacting it to construct the porous media physical model, and measuring its permeability to verify whether it meets the physical properties of the target reservoir; wherein, multiple sampling ports are preset along the length of the sand-filling pipe, and the multiple sampling ports are distributed at unequal or equal intervals along the axial direction of the sand-filling pipe.

[0025] In one embodiment, researchers selected quartz sand of different mesh sizes and mixed them in a specific ratio to simulate the permeability and porosity of the target reservoir. The uniformly mixed quartz sand was then filled into a sand-filling pipe and compacted layer by layer to construct a physical model of the sand-filled core. After filling, the permeability of the sand-filled core was measured to verify whether it met the physical property parameters of the target reservoir. The sand-filling pipe had multiple sampling ports pre-set along its axial direction, and the positions of the sampling ports were set to be equally spaced or unequally spaced according to the experimental monitoring requirements.

[0026] In another embodiment, researchers first select quartz sand with corresponding mesh sizes based on the actual permeability range of the target reservoir. For example, coarser mesh quartz sand can be selected for medium-to-high permeability reservoirs, while finer mesh quartz sand needs to be added to reduce pore size for low-permeability reservoirs. Quartz sand of different mesh sizes, weighed in proportion, is thoroughly mixed in a sand mixing device to ensure homogeneity. Subsequently, using a wet or dry filling process, the mixed sand sample is filled into the filling pipe in batches. After each layer is filled, compaction is performed using a tamping tool, and the degree of compaction is controlled to simulate the compaction effect of the reservoir rock. Removable sealing end caps and fluid distributors are installed at both ends of the filling pipe to ensure that the injected fluid can uniformly enter the core cross-section. After filling is completed, a displacement system is connected, and the gas or liquid permeability of the filled core under confining pressure is measured and compared with the permeability data of the target reservoir. If the measured permeability deviates from the target value beyond the allowable range, the quartz sand ratio or compaction degree is adjusted and the filling is repeated until the requirements are met. Finally, sampling branch pipes with control valves are installed at preset positions on the sand-filling pipe wall. The sampling points are determined according to the experimental design, for example, sampling ports are set at 1 / 4, 1 / 2, 3 / 4 of the distance from the inlet end and the outlet end to cover the entire process of fluid movement in the core, forming a porous media physical model with the function of sampling along the flow path.

[0027] Step 102: Create bound water in the physical model and saturate the target oil sample.

[0028] Establishing bound water and saturating the target oil sample in the physical model refers to the process of reconstructing the original water saturation and oil saturation of the reservoir in a sand-filled core model through physical simulation experiments such as vacuum saturation and oil-driven water displacement, so as to provide an initial fluid distribution state that conforms to the actual underground conditions for subsequent catalytic upgrading system injection.

[0029] In one embodiment, establishing bound water in a physical model and saturating the target oil sample includes: evacuating the physical model and saturating it with formation water to determine its pore volume; and injecting the target oil sample into the physical model using an oil-driven water method until bound water saturation is established.

[0030] In one embodiment, the dry weight of the compacted sand-filled core model is recorded. The core is then connected to a vacuum system and kept under vacuum for 2-4 hours to remove air from the pores. While maintaining the vacuum, the valve is slowly opened to allow simulated formation water to enter the core until it is completely submerged. This saturation is continued for another 2 hours to ensure the pores are completely filled with water. After removing the saturated core, the surface water is wiped off, and the wet weight is recorded. Based on the difference between the dry and wet weights and the density of water, the pore volume and porosity of the core are calculated using formulas. Subsequently, the core is loaded into a displacement process, and an oil-water displacement experiment is conducted using a target oil sample, such as extra-heavy oil, at a constant flow rate. During the displacement process, the water production at the core outlet is accurately recorded using a metering tube. When no water is produced at the outlet for an extended period and the oil production stabilizes, it is considered that a bound water state has been established, and the total water production at this point represents the original water-bearing volume within the core. Changes in injection pressure during the displacement process are recorded to assess oil phase permeability. Finally, the valves at both ends of the core sample, after establishing the bound water saturation, were closed, and the sample was placed in a constant temperature chamber set to the target reservoir temperature for 24 hours of static aging. The purpose of the aging treatment is to ensure that the polar components in the crude oil fully contact the rock surface, restoring the rock's wettability to near the original reservoir state and ensuring the reliability of subsequent experimental data.

[0031] In this embodiment, the processor calculates the pore volume and porosity of the core according to formula (1) and formula (2), respectively:

[0032] in, Pore ​​volume, unit is cm. 3 m1 is the core weight after water saturation, in g; m0 is the core weight before water saturation, in g. The density of water is expressed in g / cm³. 3 .

[0033]

[0034] in, Porosity; Pore ​​volume, unit is cm. 3 ; This refers to the total volume of the core, in cm³. 3 .

[0035] Step 103: Inject a preset amount of catalytic reforming system solution into the physical model, and allow the catalytic reforming system solution to undergo a reforming reaction with the target oil sample under preset reaction temperature conditions.

[0036] The reforming reaction refers to the chemical process in which the large molecular weight components in heavy oil undergo thermal cracking under the action of catalysts and hydrogen donors. The long-chain alkyl side chains and bridging bonds break, generating saturated hydrocarbons and aromatic hydrocarbons with smaller molecular weights, thereby reducing the viscosity of heavy oil and improving its fluidity.

[0037] In one embodiment, the experimenter injects a preset amount of catalytic reforming system solution into a physical model and causes the catalytic reforming system solution to undergo a reforming reaction with the target oil sample under preset reaction temperature conditions. This includes: preparing a catalytic reforming system solution by mixing a catalyst and a hydrogen donor in a preset ratio; injecting a preset amount of catalytic reforming system solution into the physical model, the preset amount being a multiple of a preset pore volume; setting the ambient temperature to the preset temperature required for the catalytic reforming reaction; and maintaining the reaction at a constant temperature for a preset time.

[0038] In one embodiment, researchers determine the optimal ratio of catalyst to hydrogen donor based on the characteristics of the target reservoir and the results of previous screening experiments. The catalyst and hydrogen donor are then prepared and thoroughly mixed using a magnetic stirrer to form a homogeneous catalytic reforming system solution. The prepared solution is loaded into a piston container and connected to a high-precision injection pump. A sand-filled core model with established bound water saturation and aging is connected to the displacement process. The injection pump is set to inject the catalytic reforming system solution into the core at a constant flow rate. The total injection volume is calculated based on the pore volume and determined as a preset multiple of the pore volume, such as 0.1, 0.3, or 0.5 times the pore volume, to simulate the impact range of the reforming system under different injection scales. During injection, changes in injection pressure are recorded, and any abnormal pressure increases or breakthroughs are observed. After injection, the valves at the core inlet and outlet are closed to seal the core and prevent fluid evaporation or pressure leakage. The temperature of the thermostat is set to the preset temperature required for the catalytic reforming reaction. The reaction temperature of most catalytic reforming systems is between 200℃ and 300℃; the appropriate reaction temperature needs to be selected according to the type of catalytic reforming system. The reaction is kept at a constant temperature for a preset time, such as 24 hours, to ensure that the modified system and heavy oil undergo sufficient thermal catalytic cracking reaction, so that the heavy components in the heavy oil are converted into light components.

[0039] Step 104: Drive the modified oil sample along the physical model and collect modified oil samples at different migration distances at multiple sampling points.

[0040] In one embodiment, driving the modified oil sample to move along a physical model and collecting modified oil samples at different moving distances at multiple sampling points includes: injecting driving fluid into the inlet of the physical model to push the modified oil sample to move along the physical model towards the outlet; opening multiple sampling points along the physical model in a preset order and collecting a preset volume of modified oil sample at each sampling point.

[0041] In one embodiment, after the catalytic reforming reaction is completed, the temperature of the constant temperature chamber is adjusted to the driving temperature, such as the reservoir temperature or hot water temperature, to ensure that the displacement process conforms to actual working conditions. The driving fluid, such as simulated formation water or hot water, is loaded into a piston container, connected to a high-precision injection pump, and the injection line is connected to the inlet end of the sand-filled core model. The injection pump is set to inject the driving fluid at a constant flow rate, propelling the reformed oil sample slowly along the core pore channels towards the outlet end. During the displacement process, the inlet pressure is monitored in real time to ensure that the displacement pressure does not exceed the core's pressure limit, avoiding damage to the core structure or fingering. When fluid is observed to be about to be produced at the first sampling point along the core path, for example, at 1 / 4 of the distance from the inlet, a clean sampling tube is prepared. The valves at each sampling point are opened sequentially from the inlet end to the outlet end. At each sampling point, after the fluid has flowed out steadily, a preset volume of reformed oil sample is collected, and the location and sampling time of that sampling point are immediately recorded. For each sampling point, the collected oil sample should be placed in a sealed sample bottle, labeled, and used for subsequent property analysis. After all sampling is completed, close all sampling point valves and continue displacement until the output fluid at the outlet stabilizes, or terminate displacement as needed for the experiment.

[0042] Step 105: Measure the physical properties of the collected modified oil samples, and establish a graph showing the modification effect of the catalytic modification system solution in the physical model as a function of distance based on the physical properties.

[0043] In one embodiment, the physical property parameters of the collected modified oil samples include at least the viscosity reduction rate. Based on the physical property parameters, a graph showing the modification effect of the catalytic modification system solution in the physical model as a function of distance is established, including: measuring the viscosity of the modified oil sample at each sampling point, calculating the viscosity reduction rate corresponding to each sampling point based on the viscosity, and fitting and establishing a graph showing the viscosity reduction rate as a function of distance based on the axial distance of each sampling point from the inlet of the physical model and its corresponding viscosity reduction rate.

[0044] In one embodiment, the experimenter allowed the modified oil samples collected in step 104 to cool to room temperature to ensure uniform and stable oil sample temperature. Using a rotational rheometer or an equivalently precise viscosity measuring instrument, the measurement temperature was set to 50°C, representing a reference temperature under reservoir or wellbore conditions. The viscosity value of the oil sample at each sampling point was measured and recorded as follows. Where i represents different sampling point locations, such as 1 / 4, 1 / 2, 3 / 4, and the outlet. Simultaneously, the initial viscosity of the extra-heavy oil is obtained. This value should be obtained by measuring the original oil sample under the same conditions, i.e., 50℃, before the experiment. For the viscosity reduction rate at the inlet end of the physical model, i.e., at 0 distance, an experimentally verified alternative method is used to determine it. Specifically, under the same reaction conditions, a parallel reforming reaction experiment is conducted using a static reactor, the viscosity of the reformed oil sample in the reactor is measured and its viscosity reduction rate is calculated, and this value is taken as the viscosity reduction rate at the inlet end. After verification by multiple sets of comparative experiments, the relative error between this method of determining the viscosity reduction rate at the inlet end and the measured viscosity reduction rate of the reformed oil sample obtained directly from the inlet end of the core through reverse displacement is within 3%, so this method has reliable representativeness. Subsequently, the viscosity reduction rate of the oil sample at each sampling point is calculated according to formula (3):

[0045] in, Let be the viscosity reduction rate at the i-th sampling point; The initial viscosity of the extra-heavy oil is expressed in mPa·s. Let be the viscosity of the modified oil sample at the i-th sampling point, in mPa·s.

[0046] After calculating the viscosity reduction rate for all sampling points, the data points were plotted on a coordinate system with the axial distance from each sampling point to the inlet of the physical model as the x-axis and the corresponding viscosity reduction rate as the y-axis. A suitable mathematical fitting method was used to perform regression analysis on these data points, establishing a curve showing the relationship between viscosity reduction rate and transport distance. This curve serves as the viscosity reduction chart along the path of the catalytic reforming system in the physical model, quantitatively describing the attenuation of the reforming effect from the inlet to the outlet. Finally, the fitted curve, the original data points, and the fitted equation were compiled to form a complete chart showing the viscosity reduction rate as a function of distance, used for subsequent determination of the effective action distance.

[0047] Step 106: Based on the preset target value of the reforming effect, determine the effective action distance of the catalytic reforming system solution in the porous medium using the chart.

[0048] In one embodiment, the experimenter determines the effective action distance of the catalytically modified system solution in the porous medium based on a chart according to a preset target value for the modification effect. This includes: setting a target viscosity reduction rate; substituting the target viscosity reduction rate into the chart to determine the distance corresponding to the target viscosity reduction rate, which is the effective action distance of the catalytically modified system solution in the porous medium.

[0049] In one embodiment, researchers determine the target value of the upgrading effect required for heavy oil extraction based on the actual development needs and economic and technical feasibility of the target reservoir. This target value is usually expressed in the form of viscosity reduction rate, for example, setting the target viscosity reduction rate to be 70%, 80%, or 90% or higher, to ensure that the upgraded heavy oil has sufficient flowability under reservoir temperature conditions, can smoothly flow into the wellbore, and be lifted to the surface. The viscosity reduction rate versus distance chart established in step 105 is retrieved. This chart uses distance as the horizontal axis and viscosity reduction rate as the vertical axis, and includes the fitted viscosity reduction rate decay curve. On the chart, the preset target viscosity reduction rate value point is found on the vertical axis. A straight line parallel to the horizontal axis is drawn through this point, intersecting the viscosity reduction rate decay curve at a single point. From this intersection point, a straight line perpendicular to the horizontal axis is drawn, and the distance value read at the intersection with the horizontal axis is the effective distance corresponding to the target viscosity reduction rate. The physical significance of this distance is that, starting from the injection well and moving along the fluid migration direction to this distance, the catalytic reforming system can still achieve a reforming effect on heavy oil that is no less than the target viscosity reduction rate; beyond this distance, the reforming effect will decay below the target value, failing to meet development requirements. Ultimately, this distance value is determined as the effective operating distance of the catalytic reforming system in this specific porous medium, serving as a key basis for designing field injection schemes, such as well spacing design and injection dosage optimization.

[0050] This application provides a method and apparatus for determining the effective range of a catalytic reforming system in porous media. By constructing a physical model of the porous media with sampling points along the transport path, the transport and reaction process of the catalytic reforming system in reservoir pores is simulated. Combined with multi-point sampling along the transport path and property analysis, a quantitative chart showing the change in reforming effect with transport distance is established, enabling accurate determination of the effective range of the catalytic reforming system in porous media. This method links and matches the chemical reforming effect of the catalytic reforming system with the physical transport distance, and can quantitatively determine the effective range of the reforming system based on the target viscosity reduction rate. This provides a reliable theoretical basis and experimental support for well spacing design and injection dosage optimization in heavy oil catalytic reforming field injection schemes.

[0051] Figure 2 The illustration schematically shows a process flow diagram of a method for determining the interaction distance of a catalytic reforming system in a porous medium according to another embodiment of this application. In another embodiment of this application, a method for determining the interaction distance of a catalytic reforming system in a porous medium is provided, comprising: S1, based on the actual physical properties of the reservoir, the sand filling pipe was filled with quartz sand, and the permeability of the sand-filled core was measured.

[0052] S2, vacuum the sand-filled rock core, saturate it with formation water, and calculate the pore volume and porosity of the core.

[0053] S3, core saturated oil, established bound water, and aged for 24 hours at reservoir temperature.

[0054] S4, prepare the catalytic modification system solution and inject the preset amount of modification solution into the sand-filled core.

[0055] S5, set the ambient temperature to the temperature required for the modification reaction, and keep the reaction at a constant temperature for 24 hours.

[0056] S6. Hot water was injected into the sandstone core to drive out oil, and 3-5 mL of modified oil samples were collected at each sampling point.

[0057] S7. The viscosity of each sample at 50℃ was measured using a rheometer, and the viscosity reduction rate was calculated. A viscosity reduction chart along the core path was then fitted and established.

[0058] S8. Set the target viscosity reduction rate according to the reservoir requirements, and input the target value into the viscosity reduction chart to determine the corresponding effective distance. This distance is the effective effective distance.

[0059] In one embodiment, researchers weighed quartz sand of different mesh sizes based on the actual physical properties of the reservoir, mixed them evenly, filled the sand-filling pipe, and measured the permeability of the sand-filled core after compaction. Next, the sand-filled core was vacuumed and saturated with formation water, and the pore volume and porosity of the core were calculated using the following formulas:

[0060] in, Pore ​​volume, unit is cm. 3 m1 is the core weight after water saturation, in g; m0 is the core weight before water saturation, in g. The density of water is expressed in g / cm³. 3 .

[0061]

[0062] in, Porosity; Pore ​​volume, unit is cm. 3 ; This refers to the total volume of the core, in cm³. 3 .

[0063] Then, the researchers saturated the oil with water displacement to establish bound water and aged it for 24 hours at the reservoir temperature. The catalyst and hydrogen donor were prepared into a solution according to the required ratio, and a modified system solution with a preset pore volume multiple was injected into the sand-filled core using a high-precision injection pump. The ambient temperature was set to the temperature required for the modification reaction, and the reaction was carried out at a constant temperature for 24 hours. Hot water was injected into the inlet of the sand-filling pipe using a high-precision injection pump, and the switches at each sampling point along the sand-filling pipe were opened sequentially. The sampling points were located at 1 / 4, 1 / 2, 3 / 4, and the outlet of the sand-filling pipe, respectively. 3-5 mL of modified oil samples were collected at each sampling point. The collected oil samples were cooled to room temperature, and the viscosity of each sample at 50°C was measured using a rheometer. The viscosity reduction rate was calculated, and the viscosity reduction rate curves of the oil samples at each sampling point were obtained. After multiple sets of experiments, it was verified that the viscosity reduction rate of the modified oil sample obtained from the core during reverse displacement was within 3% of that obtained from the inlet. Therefore, the viscosity reduction rate at the inlet was taken as the viscosity reduction rate during the modification reaction in the reactor under the same reaction conditions. A viscosity reduction chart along the core was established based on the viscosity reduction rates at each point. The viscosity reduction calculation formula is as follows:

[0064] in, Let be the viscosity reduction rate at the i-th sampling point; The initial viscosity of the extra-heavy oil is expressed in mPa·s. Let be the viscosity of the modified oil sample at the i-th sampling point, in mPa·s.

[0065] Finally, based on the actual reservoir requirements, a target viscosity reduction rate for extra-heavy oil is set. The target viscosity reduction rate is then substituted into the viscosity reduction chart along the core path to determine the distance corresponding to the target viscosity reduction rate. This distance is the effective action distance of the catalytic reforming system in the porous medium.

[0066] In one specific embodiment, the following is adopted: Figure 3 The apparatus shown was used to determine the interaction distance of a catalytic reforming system in porous media. The apparatus includes: 1-high-precision injection pump, 2-extra-heavy oil piston container, 3-catalytic reforming system piston container, 4-hot water piston container, 5-six-way valve, 6-multi-sampling-point sand-packing pipe, 7-sampling test tube, and 8-pressure monitoring device. The reservoir temperature was 30℃, the reforming reaction temperature was 250℃, and the oil used in the experiment was extra-heavy crude oil from an oilfield, with a viscosity of 27296 mPa·s at 50℃.

[0067] Following the above-described experiment on the determination of the interaction distance in a catalytic modification system within porous media, a core sample with a diameter of 2.5 cm and a length of 30 cm was prepared from quartz sand. The core permeability was measured to be 1340 mD. The core was then vacuum-sealed and saturated with formation water; the calculated pore volume was 48.5 cm³. 3The porosity was 32.95%. Saturated oil was added to the core and aged at 30℃ for 24 hours. A modified solution was prepared by mixing nano-nickel-based catalyst and hydrogen donor tetrahydronaphthalene at a ratio of 1:3. 0.1 PV (0.1 times the pore volume) of the modified solution was injected into the core at a rate of 0.1 mL / min using a high-precision injection pump. The ambient temperature was set to 250℃ and the reaction was maintained at this temperature for 24 hours. Hot water was injected into the core at a rate of 0.1 mL / min using a high-precision injection pump for oil displacement. 5 mL oil samples were collected at depths of 7.5 cm, 15 cm, 22.5 cm, and 30 cm. The viscosity of the modified oil samples at each location was measured using a rheometer, and the viscosity reduction rate was calculated. The viscosity reduction curves are shown below. Figure 4a As shown. The viscosity reduction rate at the inlet (0cm) is taken as 82.64% of the viscosity reduction rate in the reactor experiment under the same conditions. The fitted core viscosity reduction chart is shown below. Figure 4b As shown, the target viscosity reduction rate for the reservoir is 70%, and based on the established viscosity reduction chart, the effective effective distance corresponding to this target viscosity reduction rate is determined to be 4.67 cm.

[0068] The second set of experiments was conducted using the same method. The prepared sand-filled core had a permeability of 1326 mD. After vacuuming and saturation with formation water, the pore volume was measured to be 48.2 cm³. 3 The porosity was 32.74%. The core was saturated with oil and aged for 24 hours. Using a high-precision injection pump, 0.2 PV (0.2 times the pore volume) of the modified solution was injected into the core at a rate of 0.1 mL / min. The ambient temperature was set to 250℃, and the reaction was maintained at this temperature for 24 hours. Hot water was then injected into the core at a rate of 0.1 mL / min using the same high-precision injection pump. 5 mL oil samples were collected at depths of 7.5 cm, 15 cm, 22.5 cm, and 30 cm. The viscosity of the modified oil samples at each location was measured using a rheometer, and the viscosity reduction rate was calculated. The viscosity reduction curves are shown below. Figure 5a As shown. The viscosity reduction rate at the inlet (0cm) is taken as 82.64% of the viscosity reduction rate in the reactor experiment under the same conditions. The fitted core viscosity reduction chart is shown below. Figure 5b As shown, the target viscosity reduction rate for this reservoir is 70%, and based on the established viscosity reduction chart, the effective effective distance corresponding to this target viscosity reduction rate is determined to be 8.76 cm.

[0069] In one embodiment, a device for measuring the interaction distance of a catalytic reforming system in a porous medium is provided, the device comprising: The memory is configured to store instructions; and The processor is configured to execute a method for determining the interaction distance of a catalytically modified system in a porous medium according to any one of the above.

[0070] In this embodiment, the apparatus further includes: a sand-filling pipe for constructing a porous media physical model simulating reservoir physical properties, wherein the physical model has multiple sampling points along its length; an injection pump, an extra-heavy oil piston container, a six-way valve, and the sand-filling pipe working together to establish bound water in the physical model and saturate the target oil sample; and an injection pump, a catalytic reforming system piston container, a six-way valve, and the sand-filling pipe working together to inject a preset amount of catalytic reforming system solution into the physical model and to cause the catalytic reforming system solution to react with the target oil sample under a preset reaction temperature. The system includes: an injection pump, a hot water piston container, a six-way valve, and a sand-filling pipe, used to drive the modified oil sample along the physical model and collect modified oil samples at different transport distances at multiple sampling points; a viscosity measuring and data processing device, used to measure the physical property parameters of the collected modified oil samples and establish a graph showing the modification effect of the catalytic modification system solution in the physical model as a function of distance based on the physical property parameters; and an action distance determination device, used to determine the effective action distance of the catalytic modification system solution in the porous medium based on the graph and a preset target value for the modification effect.

[0071] In one embodiment, a machine-readable storage medium is provided, on which instructions are stored, which, when executed by a processor, cause the processor to be configured to perform the method for determining the action distance of a catalytically modified system in a porous medium, as described above.

[0072] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 6 As shown in the figure, the computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05, and a memory (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A06. The network interface A02 is used for communication with external terminals via a network connection. When the computer program is executed by the processor A01, it implements a method for determining the interaction distance of a catalytic modification system in a porous medium. The display screen A04 can be a liquid crystal display or an e-ink display. The input device A05 can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0073] Those skilled in the art will understand that Figure 6The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0074] This application provides a computer (electronic) device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of any of the above methods for determining the interaction distance of a catalytic reforming system in a porous medium.

[0075] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0076] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0077] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0078] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0079] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0080] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0081] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0082] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0083] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for determining the interaction distance of a catalytic reforming system in porous media, characterized in that, The method includes: A porous medium physical model simulating the physical properties of a reservoir is constructed, and the physical model has multiple sampling points along its length. Binding water is established in the physical model, and the target oil sample is saturated. A predetermined amount of catalytic reforming system solution is injected into the physical model, and the catalytic reforming system solution reacts with the target oil sample under a predetermined reaction temperature condition. The modified oil sample is driven to move along the physical model, and modified oil samples are collected at different moving distances at the multiple sampling points; The physical properties of the collected modified oil samples were measured, and a graph showing the modification effect of the catalytic modification system solution in the physical model as a function of distance was established based on the physical properties. Based on the preset target value for the reforming effect, the effective action distance of the catalytic reforming system solution in the porous medium is determined using the chart.

2. The method for determining the interaction distance of the catalytic reforming system in porous media according to claim 1, characterized in that, The process of establishing bound water in the physical model and saturating the target oil sample includes: The physical model was evacuated and saturated with formation water to determine its pore volume; The target oil sample was injected into the physical model using an oil-driven water method until bound water saturation was established.

3. The method for determining the interaction distance of the catalytic reforming system in porous media according to claim 1, characterized in that, The measured physical properties of the collected modified oil sample include at least the viscosity reduction rate. The establishment of a graph based on these physical properties, showing the modification effect of the catalytic modification system solution in the physical model as a function of distance, includes: The viscosity of the modified oil sample at each sampling point was measured, and the viscosity reduction rate corresponding to each sampling point was calculated based on the viscosity. Based on the axial distance of each sampling point from the entrance of the physical model and its corresponding viscosity reduction rate, a graph of viscosity reduction rate as a function of distance is fitted and established.

4. The method for determining the interaction distance of the catalytic reforming system in porous media according to claim 3, characterized in that, The step of determining the effective action distance of the catalytic reforming system solution in the porous medium based on the preset reforming effect target value and the chart includes: Set a target viscosity reduction rate; Substitute the target viscosity reduction rate into the graph to determine the distance corresponding to the target viscosity reduction rate. This distance is the effective action distance of the catalytically modified system solution in the porous medium.

5. The method for determining the interaction distance of the catalytic reforming system in porous media according to claim 1, characterized in that, The construction of a porous medium physical model simulating the physical properties of the reservoir includes multiple sampling points along its length, including: Based on the physical properties of the target reservoir, quartz sand of different mesh sizes was selected and mixed in a specific ratio. The mixed quartz sand was filled into the sand-filling pipe and compacted to construct the porous medium physical model, and its permeability was measured to verify whether it met the target reservoir physical property parameters. The sand-filling pipe has multiple sampling ports pre-set along its length, and the multiple sampling ports are distributed at unequal or equal intervals along the axial direction of the sand-filling pipe.

6. The method for determining the interaction distance of the catalytic reforming system in porous media according to claim 1, characterized in that, The step of injecting a predetermined amount of catalytic reforming system solution into the physical model and causing the catalytic reforming system solution to react with the target oil sample under predetermined reaction temperature conditions includes: The catalyst and hydrogen donor are prepared into a catalytic reforming system solution according to a preset ratio; The preset amount of catalytic modification system solution is injected into the physical model, wherein the preset amount is a multiple of the preset pore volume. Set the ambient temperature to the preset temperature required for the catalytic reforming reaction, and set the preset time for the constant temperature static reaction.

7. The method for determining the interaction distance of the catalytic reforming system in porous media according to claim 1, characterized in that, The modified oil sample is driven to migrate along the physical model, and modified oil samples are collected at different migration distances at the multiple sampling points, including: A driving fluid is injected into the inlet of the physical model to propel the modified oil sample along the physical model toward the outlet. Multiple sampling points along the physical model are opened sequentially in a preset order, and a preset volume of modified oil sample is collected at each sampling point.

8. A device for measuring the interaction distance of a catalytic reforming system in porous media, characterized in that, The device includes: The memory is configured to store instructions; and The processor is characterized in that it is configured to perform a method for determining the interaction distance of a catalytic reforming system in a porous medium according to any one of claims 1 to 7.

9. The apparatus for determining the action distance of a catalytic reforming system in porous media according to claim 8, characterized in that, The device further includes: Sand-filled pipes are used to construct porous media physical models that simulate the physical properties of reservoirs. The physical model has multiple sampling points along its length. An injection pump, an extra-heavy oil piston container, a six-way valve, and a sand-filling pipe are used to create bound water in the physical model and saturate the target oil sample. The injection pump, the catalytic reforming system piston container, the six-way valve, and the sand-filling pipe are used to inject a preset amount of catalytic reforming system solution into the physical model, and to allow the catalytic reforming system solution to undergo a reforming reaction with the target oil sample under a preset reaction temperature condition. The injection pump, hot water piston container, six-way valve and sand filling pipe are used to drive the modified oil sample to move along the physical model, and to collect modified oil samples at different moving distances at the multiple sampling points. A viscosity measuring and data processing device is used to measure the physical property parameters of the collected modified oil sample and to establish a graph of the modification effect of the catalytic modification system solution in the physical model as a function of distance based on the physical property parameters. The action distance determining device is used to determine the effective action distance of the catalytic reforming system solution in the porous medium based on the preset reforming effect target value and the chart.

10. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform a method for determining the action distance of a catalytically modified system in a porous medium according to any one of claims 1 to 7.

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