A visualized wellbore-reservoir integrated simulation device and method

Abstract

This invention provides an integrated wellbore-reservoir simulation device, comprising an integrated wellbore-reservoir functional base plate and a sealing plate fastened to the functional base plate; the functional base plate contains a wellbore simulation cavity and a reservoir simulation cavity located on one side of the wellbore simulation cavity along its length; a through hole connects the wellbore simulation cavity and the reservoir simulation cavity; the reservoir simulation cavity is filled with a medium simulating an oil reservoir. The functional base plate contains both a wellbore simulation cavity and a reservoir simulation cavity to simulate the wellbore structure and the porous medium space of the reservoir. This invention constructs initial reservoir conditions through an injection system and injects water, gas, or steam into the simulation device using a constant flow rate or constant pressure to achieve oil displacement simulation. Combined with a data acquisition system, the fluid migration process and production are observed and measured in real time. This invention achieves coupled simulation of the wellbore and reservoir flow processes, improving the accuracy of the simulation results and their engineering reference value.

Description

Technical Field

[0001] This invention belongs to the field of reservoir simulation technology, and relates to an integrated wellbore-reservoir simulation device, simulation system and simulation method, and particularly to a visualized integrated wellbore-reservoir simulation device and method. Background Technology

[0002] Oil and gas resources are important strategic energy sources and basic industrial raw materials for the country. Their safe and efficient development and utilization are of great significance for ensuring energy supply and supporting the sustainable development of the national economy. With the continuous improvement of oil and gas exploration and development, the development targets of oil and gas fields are gradually shifting from conventional reservoirs to reservoirs with complex burial conditions and significant differences in physical properties, which puts forward higher requirements for oil and gas field development technologies and related mechanism research.

[0003] In oil and gas field development, displacement methods such as water injection, gas injection, and steam injection are widely used to enhance oil and gas recovery. During displacement, the injected fluid enters the reservoir through the wellbore and undergoes complex multiphase flows and interactions in the near-wellbore zone and within the reservoir. These flow characteristics directly affect injection capacity, displacement efficiency, and the final development outcome. Therefore, conducting experimental simulation studies focusing on wellbore structure, injection methods, and reservoir seepage characteristics is crucial for understanding the mechanisms of oil and gas field development.

[0004] Currently, experimental research on the displacement mechanism of oil and gas reservoirs mainly relies on physical simulation methods. Commonly used experimental models include sand-filled pipe models, two-dimensional visualization plate models, and three-dimensional sand-filled models. By filling the model with quartz sand or glass microspheres of different particle sizes, the reservoir pore structure characteristics and fluid seepage behavior in porous media can be simulated. Combined with constant flow rate or constant pressure injection methods, experimental research can be carried out on development processes such as water drive, gas drive, and thermal drive.

[0005] However, existing physical simulation methods still have certain limitations, resulting in some discrepancies between experimental results and actual oil and gas field development conditions.

[0006] Therefore, finding a more suitable physical simulation method for studying the displacement mechanism of oil and gas reservoirs and solving the aforementioned technical problems in existing experimental models has become one of the urgent problems to be solved by many front-line researchers in the industry. Summary of the Invention

[0007] In view of this, the technical problem to be solved by the present invention is to provide an integrated wellbore-reservoir simulation device, simulation system, and simulation method, particularly a visualized integrated wellbore-reservoir simulation device and method. The device and experimental method provided by the present invention can more realistically reflect the influence of wellbore structural factors on the fluid flow process, thereby overcoming and reducing the deficiencies of the prior art.

[0008] This invention provides an integrated wellbore-reservoir simulation device, comprising: an integrated wellbore-reservoir functional base plate and a sealing plate fastened to the functional base plate;

[0009] The integrated wellbore-reservoir functional substrate is provided with a wellbore simulation cavity and a reservoir simulation cavity located on one side of the wellbore simulation cavity along its length.

[0010] A through hole is provided between the wellbore simulation cavity and the reservoir simulation cavity;

[0011] The reservoir simulation cavity is filled with a medium that simulates an oil reservoir.

[0012] Preferably, the wellbore-reservoir integrated functional base plate is provided with an injection hole;

[0013] The injection hole is connected to one end of the wellbore simulation cavity;

[0014] The number of injection holes is 1 to 5;

[0015] The injection port is connected to an injection tubing;

[0016] The outlet end of the injection string is located at any point along the length of the wellbore simulation cavity.

[0017] Preferably, a sealed connection is achieved between the sealing plate and the integrated wellbore-reservoir functional base plate;

[0018] The wellbore-reservoir integrated simulation device includes a visualized wellbore-reservoir integrated simulation device;

[0019] The materials used for the wellbore-reservoir integrated functional substrate and / or sealing plate include visual materials;

[0020] The number of reservoir simulation cavities includes 1 to 10;

[0021] The media of the simulated reservoir include quartz sand and / or glass microspheres;

[0022] The reservoir simulation cavity is specifically filled with media of simulated oil reservoirs of different mesh sizes.

[0023] Preferably, the wellbore-reservoir integrated functional base plate is provided with a production port;

[0024] The production hole is connected to one end of the well reservoir simulation cavity;

[0025] A high-temperature resistant sealing gasket is also provided between the sealing plate and the integrated wellbore-reservoir functional base plate;

[0026] The length-to-diameter ratio of the simulated wellbore cavity is (10~30):1;

[0027] There are two injection holes.

[0028] Preferably, the reservoir simulation chamber includes a first reservoir simulation chamber and a second reservoir simulation chamber arranged in parallel;

[0029] The first reservoir simulation cavity and the second reservoir simulation cavity are laterally arranged on one side of the wellbore simulation cavity along its length.

[0030] Each reservoir simulation chamber has two production holes connected to the end furthest from the wellbore simulation chamber in the lateral direction;

[0031] The through hole includes a plurality of closely spaced small holes;

[0032] The diameter of the through hole is 1~3mm.

[0033] This invention provides an integrated wellbore-reservoir simulation system, comprising: an injection system;

[0034] An integrated wellbore-reservoir simulation device connected to the injection system;

[0035] A data acquisition system connected to the wellbore-reservoir integrated simulation device;

[0036] The wellbore-reservoir integrated simulation device includes any one of the above-mentioned technical solutions.

[0037] Preferably, the injection system includes: a first injection device, a second injection device, and a third injection device;

[0038] The first injection device includes a steam generator and a heating device connected to the steam generator;

[0039] The second injection device includes a liquid source, an injection pump connected to the liquid source, and an intermediate container connected to the injection pump;

[0040] The third injection device gas source includes a gas source and a flow controller connected to the gas source.

[0041] Preferably, the heating device is connected to an injection port of the wellbore-reservoir integrated simulation device via a first pipeline;

[0042] A multi-way valve is installed on the first pipeline;

[0043] The intermediate container is connected to the multi-way valve via a second pipeline;

[0044] The flow controller is connected to another injection port of the wellbore-reservoir integrated simulation device via a third pipeline.

[0045] Preferably, the injection hole connection is specifically achieved through an injection tubing;

[0046] The integrated simulation system also includes a data acquisition and measurement device;

[0047] The data acquisition and measurement device is connected to the data collection hole;

[0048] The integrated simulation system also includes a temperature control device;

[0049] The integrated wellbore-reservoir simulation device is housed in a constant temperature device.

[0050] The present invention also provides a simulation method for an integrated wellbore-reservoir simulation system using any one of the above technical solutions, comprising the following steps:

[0051] 1) Water is injected into the wellbore-reservoir integrated simulation device through the injection system to saturate the water, and then oil is injected to saturate the oil, in order to construct the initial reservoir conditions;

[0052] 2) According to the preset simulation conditions, one or more of water, gas and steam are injected into the simulation device through the injection system at a constant flow rate or constant pressure to simulate the reservoir displacement process.

[0053] 3) The fluid transport status and output fluid during the experiment are observed and measured in real time through the data acquisition system.

[0054] This invention provides an integrated wellbore-reservoir simulation device, comprising: an integrated wellbore-reservoir functional base plate and a sealing plate fastened to the functional base plate; the integrated wellbore-reservoir functional base plate has a wellbore simulation cavity and a reservoir simulation cavity disposed on one side of the wellbore simulation cavity along its length; a through hole is provided between the wellbore simulation cavity and the reservoir simulation cavity; the reservoir simulation cavity is filled with a medium simulating an oil reservoir. Compared with the prior art, in the experimental models of physical simulations for experimental studies on the displacement mechanism of existing oil and gas reservoirs, this invention argues that most physical simulation experiments take the reservoir as the main research object, and the wellbore is usually simplified to boundary conditions or a single injection point. Its geometry, injection location, and connectivity with the near-wellbore reservoir are not fully characterized, making it difficult to truly reflect the influence of wellbore structural factors on the fluid flow process, thus leading to certain differences between experimental results and actual oil and gas field development conditions.

[0055] Based on this, this invention creatively designs an integrated wellbore-reservoir simulation device with a specific structure to overcome the shortcomings of existing experimental devices that cannot simultaneously characterize the wellbore structure and the longitudinal heterogeneity of the near-wellbore reservoir. This enables intuitive, visual simulation and quantitative analysis of oil and gas field development processes such as water injection, gas injection, and steam injection. Specifically, this invention introduces wellbore structure factors into the experimental process, achieving coupled simulation of wellbore and reservoir flow behavior. Compared to traditional experimental methods that only consider the reservoir, this approach more closely reflects actual oil and gas field development conditions, thereby improving the accuracy and engineering reference value of the simulation results.

[0056] The simulation device provided by this invention includes an integrated wellbore-reservoir functional base plate and a sealing plate. The functional base plate contains a wellbore simulation cavity and a reservoir simulation cavity for simulating the wellbore structure and the porous media space of the reservoir. The simulation method includes an injection system, a simulation system, and a data acquisition system. Initial reservoir conditions are established through the injection system, and water, gas, or steam is injected into the simulation device at a constant flow rate or pressure to simulate oil displacement. Simultaneously, the data acquisition system is used to monitor and measure the fluid migration process and production in real time. This invention achieves coupled simulation of the wellbore and reservoir flow processes, improving the accuracy and engineering reference value of the simulation results. Attached Figure Description

[0057] Figure 1 This is a functional substrate structure diagram of the wellbore-reservoir integrated simulation device provided by the present invention;

[0058] Figure 2 This is a structural diagram of the sealing plate of the wellbore-reservoir integrated simulation device provided by the present invention;

[0059] Figure 3 A top view of the functional base plate of the integrated wellbore-reservoir simulation device provided by the present invention;

[0060] Figure 4 The front view of the functional base plate of the integrated wellbore-reservoir simulation device provided by the present invention;

[0061] Figure 5 A side view of the functional base plate of the wellbore-reservoir integrated simulation device provided by the present invention;

[0062] Figure 6 This is a schematic diagram of the integrated wellbore-reservoir simulation device provided by the present invention;

[0063] Figure 7 This is a physical data diagram of the functional baseboard of the wellbore-reservoir integrated simulation device in Embodiment 1 of the present invention;

[0064] Figure 8 This is a physical data diagram of the sealing plate of the wellbore-reservoir integrated simulation device in Embodiment 1 of the present invention;

[0065] Figure 9 This is a diagram showing the experimental results of helix injection in Embodiment 2 of the present invention;

[0066] Figure 10 This is a diagram showing the experimental results of toe-tip injection in Embodiment 2 of the present invention. Detailed Implementation

[0067] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and not for limiting the claims of the present invention.

[0068] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0069] The purity of the raw materials used in this invention is not particularly limited. Preferably, the purity is analytical grade or conventional purity used in oil well simulation.

[0070] All processes and apparatuses of this invention are referred to by common abbreviations in the field. Each abbreviation is clear and distinct within its relevant application area, and those skilled in the art can understand its conventional process steps and apparatus structure based on the abbreviation.

[0071] All terms and abbreviations used in this invention are conventional terms and abbreviations in the field. Each term and abbreviation is clear and distinct in its relevant application area, and those skilled in the art can understand it clearly, accurately, and uniquely based on the terms and abbreviations.

[0072] This invention provides an integrated wellbore-reservoir simulation device, comprising: an integrated wellbore-reservoir functional base plate and a sealing plate fastened to the functional base plate;

[0073] The integrated wellbore-reservoir functional substrate is provided with a wellbore simulation cavity and a reservoir simulation cavity located on one side of the wellbore simulation cavity along its length.

[0074] A through hole is provided between the wellbore simulation cavity and the reservoir simulation cavity;

[0075] The reservoir simulation cavity is filled with a medium that simulates an oil reservoir.

[0076] In this invention, the wellbore-reservoir integrated functional substrate is preferably provided with an injection hole.

[0077] In this invention, the injection hole is preferably connected to one end of the wellbore simulation cavity.

[0078] In this invention, the number of injection holes can be 1 to 5, specifically 2, 3, or 4.

[0079] In this invention, the injection port is preferably connected to an injection tube.

[0080] In this invention, the outlet end of the injection string is preferably located at any point along the length of the wellbore simulation cavity.

[0081] In this invention, the sealing plate is preferably sealed to the integrated wellbore-reservoir functional substrate.

[0082] In this invention, the wellbore-reservoir integrated simulation device preferably includes a visualized wellbore-reservoir integrated simulation device.

[0083] In this invention, the material of the wellbore-reservoir integrated functional substrate and / or sealing plate preferably includes a visual material.

[0084] In this invention, the number of reservoir simulation cavities may include 1 to 10, 3 to 8, or 5 to 6.

[0085] In this invention, the medium of the simulated reservoir preferably includes quartz sand and / or glass microspheres, more preferably quartz sand or glass microspheres.

[0086] In this invention, the reservoir simulation cavity is preferably filled with a medium of simulated oil reservoir with different mesh sizes.

[0087] In this invention, the wellbore-reservoir integrated functional substrate is preferably provided with a production hole.

[0088] In this invention, the production hole is preferably connected to one end of the well reservoir simulation cavity.

[0089] In this invention, a high-temperature resistant sealing gasket is preferably provided between the sealing plate and the wellbore-reservoir integrated functional substrate.

[0090] In this invention, the length-to-diameter ratio of the wellbore simulation cavity is preferably (10~30):1;

[0091] In this invention, the number of injection holes can be two.

[0092] In this invention, the reservoir simulation cavity preferably includes a first reservoir simulation cavity and a second reservoir simulation cavity arranged in parallel.

[0093] In this invention, the first reservoir simulation cavity and the second reservoir simulation cavity are preferably arranged laterally on one side of the wellbore simulation cavity along its length.

[0094] In this invention, each reservoir simulation cavity preferably has two production holes connected to the end that is laterally away from the wellbore simulation cavity.

[0095] In this invention, the through hole preferably comprises a plurality of closely arranged small holes.

[0096] In this invention, the diameter of the through hole can be 1~3mm or 1.5~2.5mm.

[0097] This invention provides an integrated wellbore-reservoir simulation system, comprising: an injection system;

[0098] An integrated wellbore-reservoir simulation device connected to the injection system;

[0099] A data acquisition system connected to the wellbore-reservoir integrated simulation device;

[0100] The wellbore-reservoir integrated simulation device includes any one of the above-mentioned technical solutions.

[0101] In this invention, the injection system preferably includes: a first injection device, a second injection device, and a third injection device.

[0102] In this invention, the first injection device preferably includes a steam generator and a heating device connected to the steam generator.

[0103] In this invention, the second injection device preferably includes a liquid source, an injection pump connected to the liquid source, and an intermediate container connected to the injection pump.

[0104] In this invention, the gas source of the third injection device preferably includes a gas source and a flow controller connected to the gas source.

[0105] In this invention, the heating device is preferably connected to an injection port of the wellbore-reservoir integrated simulation device via a first pipeline;

[0106] In this invention, a multi-way valve is preferably provided on the first pipeline.

[0107] In this invention, the intermediate container is preferably connected to the multi-way valve via a second pipeline.

[0108] In this invention, the flow controller is preferably connected to another injection port of the wellbore-reservoir integrated simulation device via a third pipeline.

[0109] In this invention, the injection hole connection is preferably achieved through an injection tubing.

[0110] In this invention, the integrated simulation system preferably also includes a data acquisition and measurement device.

[0111] In this invention, the data acquisition and measurement device is preferably connected to the data collection hole.

[0112] In this invention, the integrated simulation system preferably also includes a temperature control device.

[0113] In this invention, the wellbore-reservoir integrated simulation device is preferably housed in a constant temperature device.

[0114] This invention provides a simulation method for an integrated wellbore-reservoir simulation system using any one of the above-described technical solutions, comprising the following steps:

[0115] 1) Water is injected into the wellbore-reservoir integrated simulation device through the injection system to saturate the water, and then oil is injected to saturate the oil, in order to construct the initial reservoir conditions;

[0116] 2) According to the preset simulation conditions, one or more of water, gas and steam are injected into the simulation device through the injection system at a constant flow rate or constant pressure to simulate the reservoir displacement process.

[0117] 3) The fluid transport status and output fluid during the experiment are observed and measured in real time through the data acquisition system.

[0118] This invention aims to complete and refine the overall technical solution, better ensure the structure and connection relationship of the integrated wellbore-reservoir simulation system, and further improve the simulation accuracy and stability of the integrated wellbore-reservoir simulation system. Specifically, the aforementioned visualized integrated wellbore-reservoir simulation device, simulation system, and simulation method may include the following:

[0119] A visualized wellbore-reservoir integrated simulation device includes: a wellbore-reservoir integrated functional base plate and a sealing plate.

[0120] The integrated wellbore-reservoir functional substrate is made of a transparent material that is resistant to high temperature and high pressure, and it contains a wellbore simulation cavity and a reservoir simulation cavity.

[0121] The wellbore simulation chamber and the reservoir simulation chamber are connected by a through hole, which forms a flow channel for fluid to enter the reservoir simulation chamber from the wellbore simulation chamber.

[0122] The wellbore simulation cavity is provided with a circular through hole for inserting the injection tubing.

[0123] The reservoir simulation cavity is filled with quartz sand to simulate the porous media environment of an oil reservoir.

[0124] The sealing plate is sealed to the integrated wellbore-reservoir functional substrate to ensure the airtightness of the experimental process.

[0125] Specifically, both the wellbore-reservoir integrated functional substrate and the sealing plate are temperature- and pressure-resistant transparent glass plates, enabling visual observation of the fluid transport state during the experiment.

[0126] Specifically, the reservoir simulation cavity can be filled with quartz sand of different mesh sizes to simulate the heterogeneous characteristics of the reservoir.

[0127] Specifically, the sidewall of the reservoir simulation cavity is provided with a circular through hole that communicates with it, for connecting the production and metering devices.

[0128] Specifically, the injection string is used to inject one or more of water, gas, or steam into the simulated wellbore cavity.

[0129] Specifically, the insertion depth of the injection string within the wellbore simulation cavity is adjustable to simulate injection conditions at different injection positions.

[0130] Specifically, a high-temperature resistant sealing gasket is provided between the sealing plate and the integrated wellbore-reservoir functional base plate.

[0131] This invention also provides a visualized wellbore-reservoir integrated simulation method, comprising the following steps:

[0132] S1. Provide a visualized wellbore-reservoir integrated simulation device as described in any of the above technical solutions, and fill the reservoir simulation cavity with quartz sand;

[0133] S2. Formation water is injected into the simulation device through the injection system to saturate the water, and then oil is injected to saturate the oil to construct the initial reservoir conditions.

[0134] S3. According to the preset working conditions, water, gas or steam is injected into the simulation device through the injection system at a constant flow rate or constant pressure to simulate the reservoir displacement process.

[0135] S4. The fluid transport status and output fluid during the experiment are observed and measured in real time through the data acquisition system.

[0136] Specifically, the simulation device is set up in a constant temperature chamber to keep the experimental temperature consistent with the target reservoir temperature.

[0137] Furthermore, the present invention provides a visualized wellbore-reservoir integrated simulation device, which mainly includes a wellbore-reservoir integrated functional base plate and a sealing plate. Both the functional base plate and the sealing plate are made of transparent materials that are resistant to high temperature and high pressure, preferably transparent glass plates, so as to facilitate real-time observation of the fluid flow behavior in the wellbore and reservoir during the experiment.

[0138] Specifically, the integrated wellbore-reservoir functional substrate has three independent functional cavities inside. One cavity forms a wellbore simulation cavity to simulate the wellbore spatial structure; the other two cavities form a reservoir simulation cavity to simulate the near-wellbore reservoir space.

[0139] Specifically, two circular through holes are provided within the wellbore simulation chamber for inserting an injection string to simulate multi-media injection conditions. The injection methods may include water injection, gas injection, and steam injection. In the actual experiment, a pipeline with an outer diameter of 3 mm can be used as the injection string to meet the requirements of experimental accuracy and operational convenience. Furthermore, the insertion depth of the injection string within the wellbore simulation chamber is adjustable to allow for adjustment of the injection position according to different experimental conditions, thereby simulating different injection methods, including but not limited to heel injection and toe injection.

[0140] Specifically, the reservoir simulation chamber is filled with quartz sand of a certain mesh size to simulate the porous media environment in actual reservoirs. By rationally selecting the particle size distribution of the quartz sand, the pore structure characteristics and seepage behavior of the reservoir can be reflected more realistically. Furthermore, the two reservoir simulation chambers can be filled with quartz sand of different mesh sizes according to the actual vertical heterogeneity characteristics of the formation, so as to achieve a refined simulation of fluid transport patterns under heterogeneous reservoir conditions.

[0141] Specifically, two circular through holes are provided on the sidewall of each reservoir simulation chamber for connecting to a metering device to measure the volume and flow rate of the produced fluid, providing a reliable basis for the acquisition and analysis of experimental data.

[0142] Specifically, the wellbore simulation cavity is connected to the two reservoir simulation cavities through through holes. The through holes form a connecting channel between the wellbore simulation cavity and the reservoir simulation cavity, which is used to simulate the process of fluid seeping from the wellbore to the near-well reservoir in an actual oil reservoir. Preferably, the number, location and diameter of the through holes can be set according to the actual wellbore completion method.

[0143] Specifically, the sealing plate is used for assembly and connection with the integrated wellbore-reservoir functional base plate. It has circular through holes corresponding to the structure of the functional base plate, and the entire device is reinforced and sealed via screw connection. A 1 mm thick high-temperature resistant sealing gasket is placed between the sealing plate and the functional base plate to prevent fluid from flowing between the plates during the experiment, thereby ensuring the sealing performance and accuracy of the results.

[0144] Specifically, the overall dimensions of the visualized wellbore-reservoir integrated simulation device are designed using similarity theory based on the actual reservoir injection string structure parameters and the longitudinal heterogeneity characteristics of the near-wellbore reservoir, so that the experimental model has good consistency with the actual reservoir conditions in terms of geometric similarity, dynamic similarity and motion similarity.

[0145] The second aspect of the present invention provides a visual wellbore-reservoir integrated simulation method, which is based on the coordinated operation of an injection system, a simulation system and a data acquisition system.

[0146] Specifically, the simulation system includes a visualized wellbore-reservoir integrated simulation device and a constant temperature chamber. The visualized wellbore-reservoir integrated simulation device is used to fill with quartz sand to simulate the porous media environment in the reservoir; the constant temperature chamber is used to provide stable experimental temperature conditions for the simulation device, so that the experimental temperature is consistent with the target reservoir temperature, thereby improving the reliability and accuracy of the experimental results.

[0147] Specifically, the injection system includes an injection pump assembly, an intermediate container assembly, a pressure gauge assembly, a valve assembly, a steam generator, a heating belt, a temperature control box, a pressure relief device, a gas cylinder, and a gas mass flow controller. Through this injection system, formation water from the intermediate container is first injected into the integrated wellbore-reservoir visualization simulation device to achieve water saturation; subsequently, oil from the intermediate container is injected into the simulation device to achieve oil saturation, thereby constructing the initial reservoir conditions required for the experiment. After the initial reservoir conditions are constructed, a displacement medium is injected into the integrated wellbore-reservoir visualization simulation device according to a preset injection method to simulate the oil displacement process. The injection method can be constant flow injection or constant pressure injection; the displacement medium can be one or more of water, gas, or steam, and can be specifically set according to the experimental purpose and reservoir operating conditions.

[0148] Specifically, the data acquisition system includes a graduated cylinder, a high-definition camera, sensors, and a computer. The high-definition camera is used for real-time visual acquisition of the fluid transport status within the wellbore and reservoir during the experiment; the graduated cylinder is used to measure the volume of the produced fluid during the experiment; and the sensors are used to transmit the acquired real-time images to the computer for storage and subsequent experimental analysis.

[0149] The advantage of this invention lies in the introduction of wellbore structure factors into the experimental process, which realizes the coupled simulation of wellbore and reservoir flow behavior. Compared with the traditional experimental method that only considers the reservoir, it is closer to the actual oil and gas field development conditions, thereby improving the accuracy of the simulation results and their engineering reference value.

[0150] See Figure 1 , Figure 1 This is a functional substrate structure diagram of the wellbore-reservoir integrated simulation device provided by the present invention.

[0151] See Figure 2 , Figure 2 This is a structural diagram of the sealing plate of the wellbore-reservoir integrated simulation device provided by the present invention.

[0152] See Figure 3 , Figure 3 This is a top view of the functional base plate of the wellbore-reservoir integrated simulation device provided by the present invention.

[0153] See Figure 4 , Figure 4 This is a front view of the functional base plate of the wellbore-reservoir integrated simulation device provided by the present invention.

[0154] See Figure 5 , Figure 5 This is a side view of the functional base plate of the wellbore-reservoir integrated simulation device provided by the present invention.

[0155] See Figure 6 , Figure 6 This is a schematic diagram of the integrated wellbore-reservoir simulation device provided by the present invention. Wherein, 1--distilled water; 2--injection pump; 3--valve; 4--steam generator; 5--three-way valve; 6--pressure relief device; 7--valve; 8--valve; 9--temperature control box; 10--heating belt; 11--six-way valve; 12--pressure gauge; 13--high-definition camera device; 14--sensor; 15--computer; 16--visualized integrated wellbore-reservoir simulation device; 17--measuring cylinder; 18--distilled water; 19--injection pump; 20--valve; 21--intermediate container; 22--valve; 23--valve; 24--intermediate container; 25--gas cylinder; 26--gas mass flow controller; 27--one-way valve; 28--valve; 29--pressure gauge; 30--temperature control box.

[0156] like Figure 1 and Figure 2 As shown, a visualized wellbore-reservoir integrated simulation device includes a wellbore-reservoir integrated functional substrate structure diagram and a sealing plate. Figure 3 This is a top view of the integrated wellbore-reservoir functional substrate, which includes a wellbore simulation chamber and two reservoir simulation chambers. Figure 4 This is the front view of the integrated wellbore-reservoir functional base plate, including two corresponding circular through holes inside the wellbore simulation cavity for inserting the injection string. Figure 5 It is a side view of the integrated wellbore-reservoir functional substrate, including the circular through hole corresponding to the side wall of the reservoir simulation cavity, for communication with the metering device.

[0157] like Figure 6As shown, a visualized wellbore-reservoir integrated simulation method includes an injection system, a simulation system, and a data acquisition system. The simulation system includes a visualized wellbore-reservoir integrated simulation device and a constant temperature chamber. The injection system includes an injection pump set, an intermediate container set, a pressure gauge set, a valve set, a steam generator, a heating belt, a temperature control chamber, a pressure relief device, gas cylinders, and a gas mass flow controller. The data acquisition system includes a measuring cylinder, a high-definition camera, sensors, and a computer.

[0158] The present invention provides a visualized integrated wellbore-reservoir simulation device, simulation system, and simulation method. The integrated wellbore-reservoir simulation device with a specific structure designed in this invention overcomes the shortcomings of existing experimental devices in simultaneously characterizing the wellbore structure and the longitudinal heterogeneity of the near-wellbore reservoir, thereby achieving intuitive and visualized simulation and quantitative analysis of oil and gas field development processes such as water injection, gas injection, and steam injection. In particular, this invention introduces wellbore structure factors into the experimental process, realizing the coupled simulation of wellbore and reservoir flow behavior. Compared with traditional experimental methods that only consider the reservoir, this method more closely reflects actual oil and gas field development conditions, thus improving the accuracy and engineering reference value of the simulation results.

[0159] The simulation device provided by this invention includes an integrated wellbore-reservoir functional base plate and a sealing plate. The functional base plate contains a wellbore simulation cavity and a reservoir simulation cavity for simulating the wellbore structure and the porous media space of the reservoir. The simulation method includes an injection system, a simulation system, and a data acquisition system. Initial reservoir conditions are established through the injection system, and water, gas, or steam is injected into the simulation device at a constant flow rate or pressure to simulate oil displacement. Simultaneously, the data acquisition system is used to monitor and measure the fluid migration process and production in real time. This invention achieves coupled simulation of the wellbore and reservoir flow processes, improving the accuracy and engineering reference value of the simulation results.

[0160] To further illustrate the present invention, the following describes in detail, with reference to embodiments, an integrated wellbore-reservoir simulation device, simulation system, and simulation method provided by the present invention. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0161] Example 1

[0162] A visualized integrated wellbore-reservoir simulation device, such as Figure 1 and Figure 2As shown, the system includes an integrated wellbore-reservoir functional base plate and a sealing plate. Both the functional base plate and the sealing plate are made of heat- and pressure-resistant transparent glass to meet the visualization requirements under high-temperature and high-pressure conditions during experiments. The integrated wellbore-reservoir functional base plate contains three independent functional cavities: one wellbore simulation cavity and two reservoir simulation cavities. The wellbore simulation cavity simulates the actual wellbore space structure, while the reservoir simulation cavities simulate the reservoir space. The wellbore simulation cavity is connected to the two reservoir simulation cavities via through-holes to simulate the fluid flow process between the wellbore and the reservoir in an actual oil reservoir. The number, location, and diameter of the through-holes can be set according to experimental needs to simulate different well completion methods or connection conditions. The wellbore simulation cavity contains two circular through-holes for inserting injection tubing to simulate multi-media injection conditions.

[0163] The injection string can use a 3mm outer diameter heat-resistant pipeline, and its insertion depth within the wellbore simulation chamber is adjustable to simulate injection methods under different injection location conditions, such as heel-end injection or toe-end injection. The reservoir simulation chamber is filled with quartz sand to simulate the porous media environment of the reservoir. The two reservoir simulation chambers can be filled with quartz sand of different mesh sizes to characterize the heterogeneous features of the reservoir. Each reservoir simulation chamber has a circular through-hole on its sidewall for connecting the production and metering devices. The sealing plate is assembled and connected to the integrated wellbore-reservoir functional base plate with screws, and a high-temperature resistant sealing gasket is placed between the two to prevent fluid flow between the plates during the experiment, ensuring the overall sealing of the device and the stability of the experimental process.

[0164] Based on data from a block in the Shengli Oilfield and incorporating similarity criteria, a visual simulation diagram of an integrated wellbore-reservoir simulation device was designed, as shown below. Figure 7 and Figure 8 As shown.

[0165] See Figure 7 , Figure 7 This is a physical data diagram of the functional baseboard of the wellbore-reservoir integrated simulation device in Embodiment 1 of the present invention.

[0166] See Figure 8 , Figure 8 This is a physical data diagram of the sealing plate of the wellbore-reservoir integrated simulation device in Embodiment 1 of the present invention.

[0167] Example 2

[0168] Based on the integrated visualization wellbore-reservoir simulation device described in Example 1, the integrated visualization wellbore-reservoir simulation method includes the following steps:

[0169] S1. Equipment preparation:

[0170] A predetermined mesh size of quartz sand is filled into the reservoir simulation cavity of the wellbore-reservoir integrated functional substrate to simulate the porous media environment of the oil reservoir. Then, the functional substrate and the sealing plate are assembled, and the assembled simulation device is placed in a constant temperature chamber. The experimental temperature is adjusted and stabilized within the target oil reservoir temperature range by a constant temperature control system.

[0171] S2. Establishing initial reservoir conditions:

[0172] according to Figure 6 The experimental setup was connected as shown. In this embodiment, saturated water was injected into the simulation device at a rate of 0.1 mL / min via an injection system; subsequently, saturated oil was injected into the simulation device at a rate of 0.1 mL / min to establish the initial oil-containing state required for the experiment.

[0173] S3, Displacement Experiment:

[0174] After establishing the initial reservoir conditions, a displacement medium is injected into the simulated wellbore cavity via an injection system according to preset operating conditions, at a constant flow rate or pressure, to simulate displacement behavior during oil and gas field development. The displacement medium can be one or more of water, gas, or steam, specifically selected based on the experimental objective.

[0175] S4. Data Acquisition and Analysis:

[0176] During the experiment, a high-definition camera was used to collect real-time visual data on the fluid transport status within the simulated wellbore cavity and reservoir cavity. At the same time, the volume of the extracted fluid was measured using a graduated cylinder to provide data support for subsequent experimental result analysis.

[0177] See Figure 9 , Figure 9 This is a diagram showing the experimental results of helix injection in Embodiment 2 of the present invention.

[0178] See Figure 10 , Figure 10 This is a diagram showing the experimental results of toe-tip injection in Embodiment 2 of the present invention.

[0179] Based on the above experimental procedures, water injection was selected for the oil displacement experiment. Figure 9 This is a graph showing the experimental results when using heel-to-toe injection at an injection rate of 5 mL / min. Figure 10 The figure shows the experimental results when using toe-end injection at an injection rate of 5 mL / min. It can be seen that the degree of water absorption in the reservoir varies depending on the placement of the injection string.

[0180] Oil well simulation experiments were conducted using the visual wellbore-reservoir integrated simulation device of the present invention.

[0181] Comparative analysis of test data from the P1 well in Shengli Oilfield revealed that the simulation results obtained by the integrated wellbore-reservoir simulation device of this invention have an error of less than 5% compared with the actual field test results. This indicates that the simulation device can accurately reflect the fluid migration and reservoir water absorption characteristics under actual wellbore-reservoir coupling conditions.

[0182] The above provides a detailed description of the visualized wellbore-reservoir integrated simulation device and method provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the textual description of the claims, or if they include equivalent structural elements that are not substantially different from the textual description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A wellbore-reservoir integrated simulation device, characterized in that, include: Integrated wellbore-reservoir functional base plate and sealing plate fastened to the functional base plate; The integrated wellbore-reservoir functional substrate is provided with a wellbore simulation cavity and a reservoir simulation cavity located on one side of the wellbore simulation cavity along its length. A through hole is provided between the wellbore simulation cavity and the reservoir simulation cavity; The reservoir simulation cavity is filled with a medium that simulates an oil reservoir.

2. The integrated simulation device according to claim 1, characterized in that, The integrated wellbore-reservoir functional base plate is provided with an injection hole; The injection hole is connected to one end of the wellbore simulation cavity; The number of injection holes is 1 to 5; The injection port is connected to an injection tubing; The outlet end of the injection string is located at any point along the length of the wellbore simulation cavity.

3. The integrated simulation device according to claim 1, characterized in that, The sealing plate and the integrated wellbore-reservoir functional base plate achieve a sealed connection; The wellbore-reservoir integrated simulation device includes a visualized wellbore-reservoir integrated simulation device; The materials used for the wellbore-reservoir integrated functional substrate and / or sealing plate include visual materials; The number of reservoir simulation cavities includes 1 to 10; The media of the simulated reservoir include quartz sand and / or glass microspheres; The reservoir simulation cavity is specifically filled with media of simulated oil reservoirs of different mesh sizes.

4. The integrated simulation device according to claim 2, characterized in that, The wellbore-reservoir integrated functional base plate is provided with a production port; The production hole is connected to one end of the well reservoir simulation cavity; A high-temperature resistant sealing gasket is also provided between the sealing plate and the integrated wellbore-reservoir functional base plate; The length-to-diameter ratio of the simulated wellbore cavity is (10~30):1; There are two injection holes.

5. The integrated simulation device according to claim 2, characterized in that, The reservoir simulation chamber includes a first reservoir simulation chamber and a second reservoir simulation chamber arranged in parallel. The first reservoir simulation cavity and the second reservoir simulation cavity are laterally arranged on one side of the wellbore simulation cavity along its length. Each reservoir simulation chamber has two production holes connected to the end furthest from the wellbore simulation chamber in the lateral direction; The through hole includes a plurality of closely spaced small holes; The diameter of the through hole is 1~3mm.

6. A wellbore-reservoir integrated simulation system, characterized in that, include: Injection system; An integrated wellbore-reservoir simulation device connected to the injection system; A data acquisition system connected to the wellbore-reservoir integrated simulation device; The wellbore-reservoir integrated simulation device includes the wellbore-reservoir integrated simulation device as described in any one of claims 1 to 4.

7. The integrated simulation system according to claim 6, characterized in that, The injection system includes: a first injection device, a second injection device, and a third injection device; The first injection device includes a steam generator and a heating device connected to the steam generator; The second injection device includes a liquid source, an injection pump connected to the liquid source, and an intermediate container connected to the injection pump; The third injection device gas source includes a gas source and a flow controller connected to the gas source.

8. The integrated simulation system according to claim 7, characterized in that, The heating device is connected to an injection port of the integrated wellbore-reservoir simulation device via a first pipeline; A multi-way valve is installed on the first pipeline; The intermediate container is connected to the multi-way valve via a second pipeline; The flow controller is connected to another injection port of the wellbore-reservoir integrated simulation device via a third pipeline.

9. The integrated simulation system according to claim 7, characterized in that, The injection hole connection is specifically achieved through an injection tubing; The integrated simulation system also includes a data acquisition and measurement device; The data acquisition and measurement device is connected to the data collection hole; The integrated simulation system also includes a temperature control device; The integrated wellbore-reservoir simulation device is housed in a constant temperature device.

10. A simulation method using the integrated wellbore-reservoir simulation system according to any one of claims 6 to 9, characterized in that, Includes the following steps: 1) Water is injected into the wellbore-reservoir integrated simulation device through the injection system to saturate the water, and then oil is injected to saturate the oil, in order to construct the initial reservoir conditions; 2) According to the preset simulation conditions, one or more of water, gas and steam are injected into the simulation device through the injection system at a constant flow rate or constant pressure to simulate the reservoir displacement process. 3) The fluid transport status and output fluid during the experiment are observed and measured in real time through the data acquisition system.

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