Visual variable temperature and pressure simulation implementation system and related working condition simulation method

Abstract

The invention discloses a visual variable temperature and pressure simulation experiment system. The system comprises a wellbore simulation system, a circulation system, a working condition simulation system, an automatic control system and a data monitoring system, the simulation wellbore system adopts a pipe-in-pipe structure and a temperature-resistant and pressure-resistant visual material, simulates circular flow under real drilling conditions, has the characteristics of visualization, pressure resistance, temperature resistance, multifunction and adjustability, realizes distributed heating and pressurization at a plurality of measuring points so as to establish a variable-temperature and variable-pressure simulation environment, and is high in practicability. The working condition simulation system simulates underground gas cut, overflow, leakage and the like. And in combination with data monitoring data, an automatic control system obtains measurement precision, migration attitude and depth position data under different flow states. Simulation in a laboratory under the real drilling working condition can be achieved, supporting conditions are provided for test and verification of model methods such as optimization design, depth positioning and error processing of a miniature measurer, and a new technical means is provided for underground complex working condition recognition and wellbore pressure safety control.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field exploitation simulation experiments, and in particular to a visualized variable temperature and pressure simulation implementation system and a related working condition simulation method. Background Art

[0002] Accurate and timely monitoring of key parameters such as wellbore temperature and pressure can provide a scientific basis and support for judging the actual situation underground and formulating reasonable construction parameters and measures. In order to meet the requirements of wellbore parameter measurement tools developing in the direction of parameter diversification, module integration, extreme environment tolerance, and rapid information transmission, a micro-measuring device developed based on micro-electromechanical system technology came into being. This tool can circulate dynamically with the wellbore and record measurements in real time. It is not restricted by complex formation conditions and can achieve ultra-small size, extremely low cost, and high-precision measurement capabilities of the entire wellbore's key parameters.

[0003] However, in the research and development and testing process that has been carried out at home and abroad, it is found that there are still many unresolved key technical problems in the micro-meter, which greatly restricts the application effect of the downhole micro-meter: ① The measurement accuracy under the cyclic motion state is difficult to calibrate, and the error analysis and compensation mechanism are unclear; ② The stability of the motion posture is difficult to control, and the depth corresponding to each measurement point is difficult to determine; ③ The regular relationship between the downhole working conditions, especially the complex downhole working conditions and the measured values ​​is difficult to quantify. The above problems are directly related to the wellbore structure and the string structure, the density, viscosity, flow rate of the wellbore working fluid, and the gas and solid content in the annulus. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a visual variable temperature and pressure simulation experiment system and a related working condition simulation method that overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect, an embodiment of the present invention provides a visualized variable temperature and pressure simulation experimental system, including: a simulated wellbore system, a circulation system, a working condition simulation system, an automatic control system and a data monitoring system, wherein:

[0006] A simulated wellbore system includes: a visualization string module, a rotation control module and a connection module, wherein the visualization string module includes at least one string segment, and a plurality of measuring points are arranged on the at least one string segment, and each string segment includes a visualized inner tube and an outer tube, wherein the inner tube is nested in the outer tube, the inner tube is used to simulate a drill string, and the outer tube is used to simulate a well wall or a casing; the visualization string module adopts a visualized, pressure-resistant and temperature-resistant material; the connection module is used to connect the plurality of string segments when the wellbore simulated by the visualization string module includes a plurality of string segments; the plurality of strings can be combined to simulate different well wall and casing conditions; the rotation control module is used to rotate the inner tube;

[0007] A circulation system connected to the inner tube inlet and the outer tube outlet of the simulated wellbore system, the circulation system comprising a liquid circulation module, a gas injection module and a solid injection module; the circulation system is used to perform solid-liquid separation and gas-liquid separation on the fluid at the outlet of the simulated wellbore system, and to replenish the separated liquid and add solid phase particles before recirculating and injecting it into the inlet of the simulated wellbore system;

[0008] A working condition simulation system, respectively connected to a plurality of measuring points distributed on the simulated wellbore, the working condition simulation system is used to simulate a leakage working condition, an overflow working condition and a gas invasion working condition;

[0009] An automatic control system for simulating the well inclination angle of the pipe string section, as well as simulating the pressure, flow rate and temperature in the circulation system and the simulated wellbore system, and obtaining the data of measurement accuracy, migration attitude and depth position under different flow conditions;

[0010] The data monitoring system is used to monitor the temperature, pressure and flow rate of each measuring point of the simulated wellbore system and generate wellbore temperature and pressure profile data.

[0011] In one embodiment, the at least one pipe string section in the simulated wellbore system includes: at least one variable diameter horizontal pipe section and at least one variable diameter vertical pipe section;

[0012] The rotation control module comprises: a rotating motor and a motor controller;

[0013] The connection module includes an elbow connection device for the horizontal pipe section and the vertical pipe section, a connector for the rotating motor and the inner pipe, and a control pipeline connector;

[0014] The variable diameter interface of the variable diameter horizontal pipe section is connected through a flange; the horizontal pipe section and the vertical pipe section are connected through the elbow connection device.

[0015] In one embodiment, the liquid phase circulation module in the circulation system includes: a liquid storage tank, a liquid replenishing pump, and a solid-liquid separator, a gas-liquid separator and a liquid circulation pump connected in sequence through pipelines; wherein:

[0016] The solid-liquid separator, gas-liquid separator and liquid circulation pump connected in sequence are respectively connected to the outlet and inlet of the simulated wellbore system through the pipeline;

[0017] The liquid storage tank has the functions of heating and stirring, and is used to prepare the fluid required for the experiment;

[0018] The solid-liquid separator, the gas-liquid separator and the outlet of the simulated wellbore system are connected via pipelines;

[0019] The liquid circulation pump is arranged on the pipeline between the inlet of the simulated wellbore system and the solid-liquid separator and the gas-liquid separator;

[0020] The liquid replenishment power pump is used to be connected to the liquid storage tank to pump out sufficient liquid phase fluid from the liquid storage tank to the pipeline to replenish the liquid phase fluid in the pipeline.

[0021] In one embodiment, the gas phase injection module in the circulation system includes: a gas source and a gas flow controller;

[0022] The gas source and the gas flow controller are connected via a gas injection pipeline;

[0023] The number of gas phase injection modules in the circulation system is one or more, and during the experiment, they are connected to corresponding measuring points, and gas is injected into the circulation system through the measuring points;

[0024] The gas flow controller is used to control the speed of injecting gas into the pipeline.

[0025] In one embodiment, the solid phase injection module in the circulation system includes: a solid phase particle storage dispenser;

[0026] The solid-phase particle storage and delivery device is arranged on the pipeline between the liquid flow pump and the liquid replenishment power pump, and is used to deliver solid-phase particles into the pipeline during the experiment.

[0027] In one embodiment, the operating condition simulation system includes: a leakage simulation module and an overflow simulation module; wherein:

[0028] The leakage simulation module includes: joints, valves, and discharge pipelines; the overflow simulation module includes: joints, valves, liquid injection channels, and gas injection channels;

[0029] The discharge pipeline is connected to the measuring point of the simulated wellbore system through a joint and a valve;

[0030] The liquid injection channel and the gas injection channel are connected to the measuring point of the simulated wellbore system through joints and valves;

[0031] The discharge pipeline is used to discharge the fluid in the experimental pipeline;

[0032] The liquid injection channel cooperates with the liquid replenishment power pump to replenish the fluid into the pipeline;

[0033] The gas injection channel is used to inject gas into the pipeline.

[0034] In one embodiment, the automatic control system includes: a well inclination control module, a temperature control module, a pressurization control module and a flow regulation module;

[0035] The well inclination angle control module includes a coupling, an elevator, and a valve; the elevator is arranged at the bottom of the horizontal pipe section to simulate any well inclination angle of the inclined well section; the elevator is connected to the horizontal pipe section through the coupling and the flange;

[0036] The variable temperature control module includes a hot runner heating rod;

[0037] The pressurization control module includes: a liquid replenishment power pump, a circulation power pump and a pressure-changing valve;

[0038] The flow regulating module includes: a gas flow controller, a liquid flow controller and a solid flow controller;

[0039] The hot runner heating rod is used to realize the heating function in the circulation process; the hot runner heating rod is installed in the pipeline through a corresponding coupling;

[0040] The gas flow controller is used to realize the gas flow control function in the circulation process; the gas flow controller is installed on the pipeline used for gas injection through a joint and a valve;

[0041] The liquid flow controller is used to realize the liquid flow control function in the circulation process. The liquid flow controller is installed on the pipeline of liquid circulation through joints and valves;

[0042] The solid flow controller is used to realize the solid flow control function in the circulation process; the solid flow controller is installed on the solid phase particle storage dispenser through a joint and a valve.

[0043] In one embodiment, the data monitoring system includes: a temperature monitoring module, a pressure monitoring module, and a flow monitoring module; wherein:

[0044] The temperature monitoring module includes: a temperature sensor, a temperature control instrument and a temperature acquisition card; the temperature monitoring module is connected through a four-way valve, a flange and a pipe string section;

[0045] The pressure monitoring module includes: a pressure sensor, a pressure display instrument and a pressure acquisition card; the pressure monitoring module is connected through a four-way valve, a flange and a pipe string section;

[0046] The flow monitoring module includes: a mass flow meter, a flow display instrument and a flow acquisition card; the flow monitoring module is connected through a four-way valve, a flange and a pipe string section.

[0047] In one embodiment, the data monitoring system further includes: an image detection module;

[0048] The image detection module includes: a camera, a camera slide rail and a host computer connected to the camera;

[0049] The camera is installed on a camera slide rail, and the camera faces the simulated wellbore system, and is used to shoot the experimental process and transmit it to the host computer.

[0050] In a second aspect, an embodiment of the present invention provides a method for simulating operating conditions, including: using the aforementioned visualized variable temperature and pressure simulation experimental system to perform operating condition simulation and data monitoring.

[0051] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0052] In the visualized variable temperature and pressure simulation experimental system provided by the embodiment of the present invention, the simulated wellbore system adopts a structure in which an inner tube is nested in an outer tube, and adopts a temperature-resistant and pressure-resistant visualization material. Unlike the traditional multiphase flow test circulation pipeline, the embodiment of the present invention has the characteristics of visualization, pressure resistance, temperature resistance and multifunctional adjustment. In addition, since the system adopts the structural feature of the inner tube nested in the outer tube, it can well simulate the circulation flow under the condition of the drilling pipe in the pipe, realize the physical simulation of the real drilling working conditions in the laboratory, and reproduce the wellbore annulus flow field under the condition of the drill string rotation under indoor laboratory conditions. Through distributed heating and pressurization to establish a segmented variable temperature and variable pressure simulation environment, the working condition simulation system can simulate underground gas invasion, overflow and leakage, etc., and provide the simulation capability of underground gas invasion and leakage complex working conditions. The data monitoring system is used to monitor the temperature, pressure and flow of each measuring point of the simulated wellbore system, and generate wellbore temperature and pressure profile data. The automatic control system combined with the data monitoring system can also obtain measurement accuracy, migration posture, depth position and other data under different flow states. The embodiments of the present invention can provide support conditions for the optimization design of the housing and components of the micro-meter, as well as the testing and verification of model methods such as depth positioning and error processing, and further provide new technical means for realizing the identification of complex downhole working conditions and safe control of wellbore pressure based on the accurate characterization of the wellbore temperature and pressure profile.

[0053] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0054] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0056] Figure 1It is a structural schematic diagram of a visualized variable temperature and pressure simulation experiment system in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0058] In order to improve the technical level of micro-measurers, it is urgently necessary to carry out indoor experimental research before further field application, establish a set of indoor circulation pipeline devices that combine local pressurization sealing, segmented temperature control, and complex downhole simulation functions, and explore the measurement accuracy correction methods, motion mechanisms, and hydrodynamic characteristics of research tools under different working conditions.

[0059] Based on this, the embodiment of the present invention provides a visual variable temperature and pressure simulation experiment system, referring to Figure 1 As shown, it includes: a simulated wellbore system, a circulation system, a working condition simulation system, an automatic control system and a data monitoring system, among which:

[0060] A simulated wellbore system includes: a visualization string module, a rotation control module and a connection module, wherein the visualization string module includes at least one string segment, and a plurality of measuring points are arranged on the at least one string segment, and each string segment includes a visualized inner tube and an outer tube, wherein the inner tube is nested in the outer tube, the inner tube is used to simulate a drill string, and the outer tube is used to simulate a well wall or a casing; the visualization string module adopts a visualized, pressure-resistant and temperature-resistant material; the connection module is used to connect a plurality of string segments when the wellbore simulated by the visualization string module includes a plurality of string segments; a plurality of strings can be combined to simulate different well wall and casing conditions; the rotation control module is used to rotate the inner tube;

[0061] The purpose of the rotation control module rotating the inner tube is to simulate the drilling process of the drill bit.

[0062] A circulation system is connected to the inner tube inlet and the outer tube outlet of the simulated wellbore system, and the circulation system includes a liquid circulation module, a gas injection module and a solid injection module; the circulation system is used to perform solid-liquid separation and gas-liquid separation on the fluid at the outlet of the simulated wellbore system, and to replenish the separated liquid and add solid phase particles before recirculating and injecting it into the inlet of the simulated wellbore system;

[0063] The circulation system mainly realizes the circulation of liquid and solid phases between the inlet and outlet of the simulated wellbore system to simulate the real wellbore annulus flow field.

[0064] The circulation process is to pass through the entrance of the simulated wellbore system, pass through each measuring point in turn, then pass through the annulus, circulate back, pass through the exit, and then enter the circulation system to achieve a closed loop.

[0065] The working condition simulation system is connected to multiple measuring points distributed on the simulated wellbore. The working condition simulation system is used to simulate the leakage working condition, overflow working condition and gas invasion working condition;

[0066] The working condition simulation system can simulate different complex working conditions such as leakage, overflow and gas intrusion by gas-liquid injection or gas-liquid discharge (overflow).

[0067] Automatic control system, used to simulate the control of the well inclination angle of the pipe string section, as well as the simulated control of the pressure, flow rate and temperature in the circulation system and simulated wellbore system, to obtain the measurement accuracy, migration attitude and depth position data under different flow conditions;

[0068] The data monitoring system is used to monitor the temperature, pressure and flow rate of each measuring point in the simulated wellbore system and generate wellbore temperature and pressure profile data.

[0069] In the above-mentioned visualized variable temperature and pressure simulation experimental system provided by the embodiment of the present invention, the simulated wellbore system adopts a structure in which the inner tube is nested in the outer tube, and adopts a temperature-resistant and pressure-resistant visualization material. Different from the traditional multiphase flow test circulation pipeline, the embodiment of the present invention has the characteristics of visualization, pressure resistance, temperature resistance and multifunctional adjustment. In addition, since the system adopts the structural feature of the inner tube nested in the outer tube, it can well simulate the circulation flow under the condition of the drilling pipe in the pipe, and can realize the physical simulation of the real drilling working conditions in the laboratory, and reproduce the wellbore annulus flow field under the condition of the drill string rotation under indoor laboratory conditions. Through distributed heating and pressurization to establish a segmented variable temperature and variable pressure simulation environment, the working condition simulation system can simulate underground gas invasion, overflow and leakage, etc., and provide the simulation capability of underground gas invasion and leakage complex working conditions. The data monitoring system is used to monitor the temperature, pressure and flow of each measuring point of the simulated wellbore system, and generate wellbore temperature and pressure profile data. The automatic control system combined with the data monitoring system can also obtain measurement accuracy, migration posture, depth position and other data under different flow states. The embodiments of the present invention can provide support conditions for the optimization design of the housing and components of the micro-meter, as well as the testing and verification of model methods such as depth positioning and error processing, and further provide new technical means for realizing the identification of complex downhole working conditions and safe control of wellbore pressure based on the accurate characterization of the wellbore temperature and pressure profile.

[0070] The above-mentioned visible heat-resistant and pressure-resistant materials include but are not limited to: transparent materials such as organic glass and high-strength resin.

[0071] The inner tube and the outer tube can be made of the same material or different materials.

[0072] For example, both the inner tube and the outer tube are made of organic glass, or the outer tube is made of organic glass and the inner tube is made of other materials, which is not limited in the embodiment of the present invention.

[0073] The structure and function of the visualized variable temperature and pressure simulation experiment system provided by the embodiment of the present invention are described in detail below in conjunction with the accompanying drawings.

[0074] Reference Figure 1 As shown, at least one pipe string section in a simulated wellbore system includes: at least one variable diameter horizontal pipe section and at least one variable diameter vertical pipe section;

[0075] A rotation control module, comprising: a rotation motor and a motor controller;

[0076] A connection module, including an elbow connection device for the horizontal pipe section and the vertical pipe section, a connector for the rotating motor and the inner pipe, and a control pipeline connector;

[0077] The variable diameter interface of the variable diameter horizontal pipe section is connected through a flange; the horizontal pipe section and the vertical pipe section are connected through the elbow connection device.

[0078] For example, the horizontal pipe section and the vertical pipe section are connected by a pressure-resistant bending assembly.

[0079] The simulated wellbore system may include horizontal pipe sections and vertical pipe sections, but in the specific experimental process, the simulated wellbore can realize the flexible disassembly and assembly of the horizontal section and the vertical section, and complete the simulation of the single horizontal section and the single vertical section. According to the needs of the experiment, it is possible to choose to use only the horizontal pipe section to simulate the wellbore, or only the vertical pipe section to simulate the wellbore, or connect the horizontal pipe section and the vertical pipe section to form a simulated wellbore.

[0080] The outer tube can simulate the well wall or casing, and the inner tube can simulate the drill string. By setting different tube diameters, the effect of simulating wellbores and drill strings of different openings can be achieved.

[0081] Specifically, in the rotation control module, the rotation motor drives the horizontal pipe section to rotate under the control of the motor controller to simulate the drilling of the drill bit.

[0082] In one embodiment, the liquid phase circulation module in the circulation system includes: a liquid storage tank, a liquid replenishing pump, and a solid-liquid separator, a gas-liquid separator and a liquid circulation pump connected in sequence through pipelines; wherein:

[0083] The solid-liquid separator, gas-liquid separator and liquid circulation pump connected in sequence are connected to the outlet and inlet of the simulated wellbore system through pipelines respectively;

[0084] Liquid storage tank, with heating and stirring functions, used to prepare fluids required for experiments;

[0085] The solid-liquid separator, the gas-liquid separator and the outlet of the simulated wellbore system are connected through pipelines;

[0086] The liquid circulation pump is arranged on the pipeline between the inlet of the simulated wellbore system and the solid-liquid separator and the gas-liquid separator;

[0087] The liquid replenishment power pump is used to be connected to the liquid storage tank and pump sufficient liquid phase fluid from the liquid storage tank to the pipeline to replenish the liquid phase fluid in the pipeline.

[0088] The above-mentioned pipelines mainly refer to the pipelines from the inlet to the outlet of the simulated wellbore system.

[0089] The gas phase injection module in the circulation system includes: a gas source and a gas flow controller;

[0090] The gas source and the gas flow controller are connected through a gas injection pipeline;

[0091] Reference Figure 1 In the lower left corner, the dry gas source is connected to each measuring point of the simulated wellbore system through a gas pipeline. On the pipeline, a gas flow controller is included, and pipeline valves such as a one-way valve can also be set.

[0092] Specifically, although Figure 1 Only one gas phase injection module is drawn, but in actual implementation, the number of gas phase injection modules in the circulation system is one or more, and in the experiment, they are connected to the corresponding measuring points, and gas is injected into the circulation system through the measuring points;

[0093] Gas flow controller, used to control the speed of gas injection into the pipeline.

[0094] In one embodiment, the solid phase injection module in the circulation system includes: a solid phase particle storage dispenser;

[0095] The solid phase particle storage and delivery device is arranged on the pipeline between the liquid flow pump and the liquid replenishment power pump, and is used to deliver solid phase particles into the pipeline during the experiment.

[0096] The above-mentioned solid particles include but are not limited to sand and other solid particles.

[0097] In one embodiment, the above-mentioned operating condition simulation system includes: a leakage simulation module and an overflow simulation module; wherein:

[0098] The leakage simulation module includes: joints, valves, and discharge pipelines; the overflow simulation module includes: joints, valves, liquid injection channels, and gas injection channels;

[0099] The discharge pipeline is connected to each measuring point of the simulated wellbore system through a joint and a valve;

[0100] The liquid injection channel and the gas injection channel are connected to various measuring points of the simulated wellbore system through joints and valves;

[0101] The discharge pipeline is used to discharge the fluid in the experimental pipeline;

[0102] The liquid injection channel cooperates with the liquid replenishment power pump to replenish the fluid into the pipeline;

[0103] The gas injection channel is used to inject gas into the pipeline.

[0104] Figure 1 There may be multiple discharge pipelines, liquid injection channels, and gas injection channels shown in the figure, which are used to connect with the measuring points during the experiment, replenish liquid into the wellbore simulation system, inject gas, and discharge liquid in the pipeline.

[0105] In one embodiment, the automatic control system comprises: a well inclination control module, a temperature control module, a pressurization control module and a flow regulation module;

[0106] The well inclination angle control module includes a coupling, an elevator, and a valve; the elevator is arranged at the bottom of the horizontal pipe section to simulate any well inclination angle of the inclined well section; the elevator is connected to the horizontal pipe section through the coupling and the flange;

[0107] The variable temperature control module includes a hot runner heating rod;

[0108] The pressurization control module includes: a liquid replenishment power pump, a circulation power pump and a pressure-changing valve;

[0109] The flow regulating module includes: a gas flow controller, a liquid flow controller and a solid flow controller; wherein:

[0110] The hot runner heating rod is used to realize the heating function during the circulation process; the hot runner heating rod is installed in the pipeline through the corresponding coupling;

[0111] The gas flow controller is used to realize the gas flow control function in the circulation process; the gas flow controller is installed on the pipeline used for gas injection through a joint and a valve;

[0112] The liquid flow controller is used to realize the liquid flow control function in the circulation process. The liquid flow controller is installed on the pipeline of liquid circulation through joints and valves;

[0113] The solid flow controller is used to realize the solid flow control function in the circulation process; the solid flow controller is installed on the solid phase particle storage dispenser through a joint and a valve.

[0114] The automatic control system can realize functions such as automatic injection of fluids in different phases under various working conditions, heating and pressurizing of the pipe column, etc.

[0115] In one embodiment, the data monitoring system specifically includes: a temperature monitoring module, a pressure monitoring module, and a flow monitoring module; wherein:

[0116] The temperature monitoring module includes: a temperature sensor, a temperature control instrument and a temperature acquisition card; the temperature monitoring module is connected through a four-way valve, a flange and a pipe string section;

[0117] The pressure monitoring module includes: a pressure sensor, a pressure display instrument and a pressure acquisition card; the pressure monitoring module is connected through a four-way valve, a flange and a pipe string section;

[0118] The flow monitoring module includes: a mass flow meter, a flow display instrument and a flow acquisition card; the flow monitoring module is connected through a four-way valve, a flange and a pipe string section.

[0119] In one embodiment, the temperature sensor and the temperature acquisition card are connected through a four-way valve, a flange and a pipe column; the pressure sensor and the pressure acquisition card are connected through a four-way valve, a flange and a pipe column; the mass flow meter and the flow acquisition card are connected through a four-way valve, a flange and a pipe column.

[0120] By installing multiple temperature sensors, the temperature at different positions (different measuring points) of the pipe string is measured to achieve the temperature field measurement of the entire pipe string; by installing multiple pressure sensors, the pressure at different positions (different measuring points) of the pipe string is measured to achieve the pressure field measurement of the entire pipe string; by installing a mass flow meter, the flow rate in the pipe string is measured.

[0121] In one embodiment, the data monitoring system further includes: an image detection module;

[0122] The image detection module includes: a camera, a camera slide rail and a host computer connected to the camera;

[0123] The camera is installed on a camera slide rail, and the camera faces the simulated wellbore system, and is used to shoot the experimental process and transmit it to the host computer.

[0124] The experimental process is recorded as videos, photos and other multimedia information and transmitted to the host computer to facilitate the corresponding multimedia data storage, processing and analysis operations on the host computer.

[0125] The camera may be, for example, a high-definition, high-frame-rate, high-speed camera.

[0126] The above-mentioned visualized variable temperature and pressure simulation experiment system provided by the embodiment of the present invention has at least the following technical features:

[0127] 1) The visualization of the pipe-in-pipe structure can realize the reproduction of the wellbore annulus flow field when the drill string rotates, so as to achieve a true simulation of the wellbore annulus flow field.

[0128] Furthermore, the gas-liquid two-phase flow pattern in the annulus is identified by high-speed cameras, and experimental tests and fluid mechanics research on downhole operating tools such as micro-meters are carried out under different flow patterns.

[0129] 2) Lay out pressurized sections at different positions in the tubing to simulate the actual pressurized state downhole and achieve effective control of circulating wellbore pressure. Support pressure function testing of downhole tools such as micrometers, and determine the pressure measurement function and pressure measurement accuracy of downhole tools such as micrometers through testing to achieve circulating wellbore pressure regulation.

[0130] 3) Install heating and insulation devices at different positions in the pipe string to effectively control the temperature of each part of the pipe string and simulate the characteristics of underground temperature change. Support temperature function testing of underground operation tools such as micro-meters, and determine the temperature measurement function and temperature measurement accuracy of underground operation tools such as micro-meters through testing.

[0131] 4) The embodiment of the present invention designs the pipe string in the simulated wellbore system as a multi-size variable diameter pipe string, so that the simulated pipe string conforms to the sizes of most wellbores and matching drill strings. The multi-size variable diameter pipe string realizes the functions of vertical well simulation, horizontal well simulation and multi-opening wellbore simulation, and provides variable diameter experimental testing capabilities for downhole operation tools such as micro-measurers.

[0132] 5) The embodiment of the present invention realizes the simulation of complex downhole working conditions such as downhole overflow and leakage by means of multiphase flow injection control and setting leakage points at various positions of the pipe string. Visual simulation experiments of complex working conditions such as overflow and leakage are carried out using downhole operation tools such as micro-meters, and multi-physical field parameters such as dynamics, temperature, and pressure under different working conditions are measured. Based on this, wellbore temperature and pressure profile data are generated, and a calculation method for identifying and judging complex downhole working conditions is established to realize the intelligent identification and judgment function of the micro-meter for complex downhole working conditions.

[0133] In order to better illustrate the visualized variable temperature and pressure simulation experiment system provided by the embodiment of the present invention, several specific implementation modes are given as examples below:

[0134] Embodiment 1:

[0135] ①Simulated wellbore system: The simulated wellbore system includes vertical pipe sections and horizontal pipe sections (such as Figure 1 ), the outer pipe of the vertical pipe section is made of plexiglass, the inner pipe is made of 304 stainless steel, with a pressure resistance of 5MPa, and a hot runner electric heating device is provided in the middle section of the inner pipe, with a heating output of more than 200°C; the inner and outer pipes of the horizontal pipe section are all made of plexiglass, and are equipped with a hot runner electric heating device. The inner pipe is connected to the rotating motor and the motor controller; the horizontal pipe section and the vertical pipe section elbow are connected by a flange, and the flange is connected to the ball valve.

[0136] ②Circulation system: mainly includes liquid circulation module, gas injection module and solid injection module. Among them, the liquid storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, is made of 304 stainless steel, and is equipped with a liquid level detection device. The solid injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0137] ③Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The replaceable leakage joints are installed inside the leakage interface flange for leakage testing; the control valve uses a DN15 ball valve to control the leakage rate. The gas injection channel is located at the reserved interface of the metal flange, with 4 interfaces in the circumferential direction for injection, the interface size is 3 / 8NPT, the maximum compressed air injection flow rate is 300L / s, and quantitative input is possible.

[0138] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0139] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed motion acquisition instrument is equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0140] Embodiment 2:

[0141] ① Simulated wellbore system: The simulated wellbore system includes a horizontal pipe section. The inner and outer pipes of the horizontal pipe section are all made of organic glass. A hot runner electric heating device is provided. The inner pipe is connected to a rotating motor and a motor controller.

[0142] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. Among them, the liquid phase storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, and is made of 304 stainless steel, equipped with a liquid level detection device. The solid phase injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0143] ③Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The replaceable leakage joints are installed inside the leakage interface flange for leakage testing; the control valve uses a DN15 ball valve to control the leakage rate. The gas injection channel is located at the reserved interface of the metal flange, with 4 interfaces in the circumferential direction for injection, the interface size is 3 / 8NPT, the maximum compressed air injection flow rate is 300L / s, and quantitative input is possible.

[0144] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0145] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed motion acquisition instrument is equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0146] Embodiment three:

[0147] ① Simulated wellbore system: The simulated wellbore system includes a vertical pipe section. The outer pipe of the vertical pipe section is made of plexiglass, and the inner pipe is made of 304 stainless steel. It has a pressure resistance of 5MPa. A hot runner electric heating device is set in the middle section of the inner pipe. The heating output is above 200℃. The inner pipe is connected to a rotating motor and a motor controller.

[0148] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. Among them, the liquid phase storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, and is made of 304 stainless steel, equipped with a liquid level detection device. The solid phase injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0149] ③Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The replaceable leakage joints are installed inside the leakage interface flange for leakage testing; the control valve uses a DN15 ball valve to control the leakage rate. The gas injection channel is located at the reserved interface of the metal flange, with 4 interfaces in the circumferential direction for injection, the interface size is 3 / 8NPT, the maximum compressed air injection flow rate is 300L / s, and quantitative input is possible.

[0150] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0151] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed motion acquisition instrument is equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0152] Embodiment 4:

[0153] ①Simulated wellbore system: The simulated wellbore system includes vertical pipe sections and horizontal pipe sections (such as Figure 1), the outer tube of the vertical pipe section is made of plexiglass, the inner tube is made of 304 stainless steel, with a pressure resistance of 5MPa, and the middle section of the inner tube is equipped with a hot runner electric heating device, with a heating output of more than 200°C; the inner and outer pipes of the horizontal pipe section are all made of plexiglass, and are equipped with a hot runner electric heating device. The inner tube is connected to the rotating motor and the motor controller; the horizontal pipe section is connected to the vertical pipe section elbow through a flange, and the flange is connected to the ball valve; the lower part of the horizontal pipe section is equipped with a lift, a hydraulic pump and a lift controller, which can realize the simulation of any well inclination angle of the inclined well section.

[0154] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. Among them, the liquid phase storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, and is made of 304 stainless steel, equipped with a liquid level detection device. The solid phase injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0155] ③Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The replaceable leakage joints are installed inside the leakage interface flange for leakage testing; the control valve uses a DN15 ball valve to control the leakage rate. The gas injection channel is located at the reserved interface of the metal flange, with 4 interfaces in the circumferential direction for injection, the interface size is 3 / 8NPT, the maximum compressed air injection flow rate is 300L / s, and quantitative input is possible.

[0156] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0157] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed camera uses a high-speed motion acquisition instrument, equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0158] Embodiment five:

[0159] ①Simulated wellbore system: The simulated wellbore system includes vertical pipe sections and horizontal pipe sections (such as Figure 1 ), the outer tube of the vertical pipe section is made of plexiglass, the inner tube is made of 304 stainless steel, with a pressure resistance of 5MPa, and the middle section of the inner tube is equipped with a hot runner electric heating device with a heating output of more than 200°C; the inner and outer pipelines of the horizontal pipe section are all made of plexiglass and are equipped with a hot runner electric heating device. The inner tube is connected to a rotating motor and a motor controller; the horizontal pipe section is connected to the vertical pipe section elbow through a flange, and the flange is connected to a ball valve; the lower part of the horizontal pipe section is equipped with a lift, a hydraulic pump and a lift controller, which can realize the simulation of any well inclination angle of the inclined well section.

[0160] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. Among them, the liquid phase storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, and is made of 304 stainless steel, equipped with a liquid level detection device. The solid phase injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0161] ③ Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The replaceable leakage joints are installed inside the leakage interface flange for leakage testing; the control valve uses a DN15 ball valve to control the leakage rate, and the leakage joints and valves are connected to the discharge pipeline through flanges.

[0162] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0163] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed motion acquisition instrument is equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0164] Embodiment six:

[0165] ①Simulated wellbore system: The simulated wellbore system includes vertical pipe sections and horizontal pipe sections (such as Figure 1 ), the outer tube of the vertical pipe section is made of plexiglass, the inner tube is made of 304 stainless steel, with a pressure resistance of 5MPa, and the middle section of the inner tube is equipped with a hot runner electric heating device, with a heating output of more than 200°C; the inner and outer pipes of the horizontal pipe section are all made of plexiglass, equipped with a hot runner electric heating device, and the inner tube is connected to the rotating motor and the motor controller; the horizontal pipe section and the vertical pipe section elbow are connected by a flange, and the flange is connected to the ball valve.

[0166] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. Among them, the liquid phase storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, and is made of 304 stainless steel, equipped with a liquid level detection device. The solid phase injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0167] ③Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The gas injection channel is located at the reserved interface of the metal flange, with 4 interfaces for injection in the circumferential direction, the interface size is 3 / 8NPT, the maximum compressed air injection flow rate is 300L / s, and the control valve uses a DN15 ball valve to control the injection speed, which can be quantitatively input.

[0168] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0169] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed motion acquisition instrument is equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0170] Embodiment seven:

[0171] ①Simulated wellbore system: The simulated wellbore system includes vertical pipe sections and horizontal pipe sections (such as Figure 1 ), the inner diameter of the vertical pipe section is adjustable from 80mm to 450mm, and the outer diameter is adjustable from 120mm to 600mm; the inner diameter of the horizontal pipe section is adjustable from 50mm to 300mm, and the outer diameter is adjustable from 80mm to 450mm; the outer tube of the vertical pipe section is made of plexiglass, and the inner tube is made of 304 stainless steel, with a pressure resistance of 5MPa. The middle section of the inner tube is equipped with a hot runner electric heating device, and the heating output is above 200℃; the inner and outer pipes of the horizontal pipe section are all made of plexiglass, and are equipped with a hot runner electric heating device. The inner tube is connected to the rotating motor and the motor controller; the horizontal pipe section and the vertical pipe section elbow are connected by a flange, and the flange is connected to the ball valve.

[0172] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. Among them, the liquid phase storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulation pump adopts a high-temperature and high-pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200℃, a maximum displacement of 100L / s, and a frequency converter to accurately control the flow rate. The solid-liquid separator has a volume of 50L, a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L, a working pressure of 20MPa, and is made of 304 stainless steel, equipped with a liquid level detection device. The solid phase injection module includes a 50L solid phase particle storage tank, a gas control valve, a liquid replenishment pipeline and a DN15 manual valve.

[0173] ③Working condition simulation system: including leakage joints and control valves, gas injection channels, solid-liquid separators, gas-liquid separators, etc. The replaceable leakage joints are installed inside the leakage interface flange for leakage testing; the control valve uses a DN15 ball valve to control the leakage rate. The gas injection channel is located at the reserved interface of the metal flange, with 4 interfaces in the circumferential direction for injection, the interface size is 3 / 8NPT, the maximum compressed air injection flow rate is 300L / s, and quantitative input is possible.

[0174] ④ Automatic control system: The heating device uses a hot runner heater, which is wrapped around the outer wall of the inner tube through a metal flange interface. It is equipped with a temperature control instrument with PID adjustment function, which is mainly used to heat and control the temperature of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulation pump, with a power of 100kW. The back pressure valve controls the pressure 0-1500psi, 1 / 2NPT interface, CV=0.6.

[0175] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operating system. The temperature sensor has a range of -50℃-260℃ and an accuracy of ±0.1℃. The pressure sensor has a range of 25MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000kg / h and an accuracy of ±0.2%. The high-speed motion acquisition instrument is equipped with a 105mm macro lens, a 300W light source, a pan / tilt, a tripod, high-speed acquisition software and motion control rails. All pressure, flow, temperature, outlet control and other values ​​are collected through the automatic control operating system, and the data is automatically stored and backed up.

[0176] Based on the same inventive concept, an embodiment of the present invention further provides a method for simulating operating conditions, which uses the aforementioned visualized variable temperature and pressure simulation experimental system to perform operating condition simulation and data monitoring.

[0177] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A visual variable temperature and pressure simulation experiment system, characterized in that: include: Simulated wellbore system, circulation system, working condition simulation system, automatic control system and data monitoring system, including: A simulated wellbore system includes: a visualization string module, a rotation control module and a connection module, wherein the visualization string module includes at least one string segment, and a plurality of measuring points are arranged on the at least one string segment, and each string segment includes a visualized inner tube and an outer tube, wherein the inner tube is nested in the outer tube, the inner tube is used to simulate a drill string, and the outer tube is used to simulate a well wall or a casing; the visualization string module adopts a visualized, pressure-resistant and temperature-resistant material; the connection module is used to connect the plurality of string segments when the wellbore simulated by the visualization string module includes a plurality of string segments; the plurality of strings can be combined to simulate different well wall and casing conditions; the rotation control module is used to rotate the inner tube; A circulation system connected to the inner tube inlet and the outer tube outlet of the simulated wellbore system, the circulation system comprising a liquid circulation module, a gas injection module and a solid injection module; the circulation system is used to perform solid-liquid separation and gas-liquid separation on the fluid at the outlet of the simulated wellbore system, and to replenish the separated liquid and add solid phase particles before recirculating and injecting it into the inlet of the simulated wellbore system; A working condition simulation system, respectively connected to a plurality of measuring points distributed on the simulated wellbore, the working condition simulation system is used to simulate a leakage working condition, an overflow working condition and a gas invasion working condition; An automatic control system for simulating the well inclination angle of the pipe string section, as well as simulating the pressure, flow rate and temperature in the circulation system and the simulated wellbore system, and obtaining the data of measurement accuracy, migration attitude and depth position under different flow conditions; The data monitoring system is used to monitor the temperature, pressure and flow rate of each measuring point of the simulated wellbore system and generate wellbore temperature and pressure profile data.

2. The system according to claim 1, characterized in that The at least one pipe string section in the simulated wellbore system includes: at least one variable diameter horizontal pipe section and at least one variable diameter vertical pipe section; The rotation control module comprises: a rotating motor and a motor controller; The connection module includes an elbow connection device for the horizontal pipe section and the vertical pipe section, a connector for the rotating motor and the inner pipe, and a control pipeline connector; The variable diameter interface of the variable diameter horizontal pipe section is connected through a flange; the horizontal pipe section and the vertical pipe section are connected through the elbow connection device.

3. The system according to claim 2, characterized in that The liquid phase circulation module in the circulation system includes: a liquid storage tank, a liquid replenishing pump, and a solid-liquid separator, a gas-liquid separator and a liquid circulation pump connected in sequence through pipelines; wherein: The solid-liquid separator, gas-liquid separator and liquid circulation pump connected in sequence are respectively connected to the outlet and inlet of the simulated wellbore system through the pipeline; The liquid storage tank has the functions of heating and stirring, and is used to prepare the fluid required for the experiment; The solid-liquid separator, the gas-liquid separator and the outlet of the simulated wellbore system are connected via pipelines; The liquid circulation pump is arranged on the pipeline between the inlet of the simulated wellbore system and the solid-liquid separator and the gas-liquid separator; The liquid replenishment power pump is used to be connected to the liquid storage tank to pump out sufficient liquid phase fluid from the liquid storage tank to the pipeline to replenish the liquid phase fluid in the pipeline.

4. The system according to claim 1, characterized in that The gas phase injection module in the circulation system includes: a gas source and a gas flow controller; The gas source and the gas flow controller are connected via a gas injection pipeline; The number of gas phase injection modules in the circulation system is one or more, and during the experiment, they are connected to corresponding measuring points, and gas is injected into the circulation system through the measuring points; The gas flow controller is used to control the speed of injecting gas into the pipeline.

5. The system according to claim 3, characterized in that The solid phase injection module in the circulation system includes: a solid phase particle storage and delivery device; The solid-phase particle storage and delivery device is arranged on the pipeline between the liquid flow pump and the liquid replenishment power pump, and is used to deliver solid-phase particles into the pipeline during the experiment.

6. The system according to claim 3, characterized in that The working condition simulation system includes: a leakage simulation module and an overflow simulation module; wherein: The leakage simulation module includes: joints, valves, and discharge pipelines; the overflow simulation module includes: joints, valves, liquid injection channels, and gas injection channels; The discharge pipeline is connected to the measuring point of the simulated wellbore system through a joint and a valve; The liquid injection channel and the gas injection channel are connected to the measuring point of the simulated wellbore system through joints and valves; The discharge pipeline is used to discharge the fluid in the experimental pipeline; The liquid injection channel cooperates with the liquid replenishment power pump to replenish the fluid into the pipeline; The gas injection channel is used to inject gas into the pipeline.

7. The system according to claim 6, characterized in that The automatic control system includes: a well inclination control module, a temperature change control module, a pressurization control module and a flow regulation module; The well inclination angle control module includes a coupling, an elevator, and a valve; the elevator is arranged at the bottom of the horizontal pipe section to simulate any well inclination angle of the inclined well section; the elevator is connected to the horizontal pipe section through the coupling and the flange; The variable temperature control module includes a hot runner heating rod; The pressurization control module includes: a liquid replenishment power pump, a circulation power pump and a pressure-changing valve; The flow regulating module includes: a gas flow controller, a liquid flow controller and a solid flow controller; The hot runner heating rod is used to realize the heating function in the circulation process; the hot runner heating rod is installed in the pipeline through a corresponding coupling; The gas flow controller is used to realize the gas flow control function in the circulation process; the gas flow controller is installed on the pipeline used for gas injection through a joint and a valve; The liquid flow controller is used to realize the liquid flow control function in the circulation process. The liquid flow controller is installed on the pipeline of liquid circulation through joints and valves; The solid flow controller is used to realize the solid flow control function in the circulation process; the solid flow controller is installed on the solid phase particle storage dispenser through a joint and a valve.

8. The system of claim 1, wherein: The data monitoring system includes: a temperature monitoring module, a pressure monitoring module, and a flow monitoring module; wherein: The temperature monitoring module includes: a temperature sensor, a temperature control instrument and a temperature acquisition card; the temperature monitoring module is connected through a four-way valve, a flange and a pipe string section; The pressure monitoring module includes: a pressure sensor, a pressure display instrument and a pressure acquisition card; the pressure monitoring module is connected through a four-way valve, a flange and a pipe string section; The flow monitoring module includes: a mass flow meter, a flow display instrument and a flow acquisition card; the flow monitoring module is connected through a four-way valve, a flange and a pipe string section.

9. The system according to claim 8, characterized in that The data monitoring system further includes: an image detection module; The image detection module includes: a camera, a camera slide rail and a host computer connected to the camera; The camera is installed on a camera slide rail, and the camera faces the simulated wellbore system, and is used to shoot the experimental process and transmit it to the host computer.

10. A method for simulating working conditions, characterized in that: include: The visual variable temperature and pressure simulation experimental system as described in any one of claims 1 to 9 is used to perform operating condition simulation and data monitoring.

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