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

Abstract

The application discloses a visual variable temperature and pressure simulation experiment system. The system comprises a simulated wellbore system, a circulating system, a working condition simulation system, an automatic control system and a data monitoring system. The simulated wellbore system adopts a pipe-in-pipe structure and visual materials resistant to temperature and pressure, simulates the circulating flow under real drilling conditions, has the characteristics of visualization, pressure and temperature resistance and multifunctional adjustment, realizes distributed heating and pressurization at multiple measuring points to establish a variable temperature and pressure simulation environment, and simulates downhole gas invasion, overflow and loss and the like. In combination with the data monitoring data, the automatic control system obtains the measurement accuracy, movement posture and depth position data under different flow states. The application can realize simulation in a laboratory under real drilling working condition, provides support conditions for model method test verification of optimization design, depth positioning and error processing of a micro measuring device, and provides a new technical means for downhole complex working condition identification and wellbore pressure safety control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field exploitation simulation experiment, in particular to a visual variable temperature and pressure simulation implementation system and a related working condition simulation method. BACKGROUND

[0002] Accurate and timely monitoring of key parameters such as wellbore temperature and pressure can provide scientific basis and support for judging the actual situation downhole, formulating reasonable construction parameters and measures. In order to meet the requirements of the development of wellbore parameter measurement tools in the direction of parameter diversification, module integration, extreme environment tolerance, and rapid information transmission, a micro measurement device based on micro-electro-mechanical system technology has emerged. This tool can circulate with the wellbore and record measurements in real time, is not limited by complex formation conditions, and can achieve ultra-small size, extremely low cost, and high precision in full wellbore key parameter measurement.

[0003] However, during the current research and development and testing process at home and abroad, it has been found that the micro measurement device still has many unsolved key technical problems, which greatly restricts the application effect of the downhole micro measurement device: ① the measurement accuracy under the circulating motion state is difficult to calibrate, and the error analysis and compensation mechanism are not clear; ② the motion posture stability is difficult to control, and the depth corresponding to each measurement point is difficult to determine; ③ the law between the downhole working conditions, especially the complex downhole working conditions, and the measurement values is difficult to quantitatively characterize. The above problems are directly related to the wellbore structure and the pipe string structure, the density, viscosity, and flow rate of the wellbore working fluid, and the gas and solid content in the annulus. SUMMARY

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

[0005] In a first aspect, an embodiment of the present application provides a visual variable temperature and pressure simulation experiment system, comprising: a simulated wellbore system, a circulation system, a working condition simulation system, an automatic control system, and a data monitoring system, wherein:

[0006] The simulated wellbore system comprises a visual pipe string module, a rotation control module, and a connection module. The visual pipe string module comprises at least one pipe string section, and a plurality of measurement points are arranged on the at least one pipe string section. Each pipe string section comprises a visual inner pipe and an outer pipe. The inner pipe is nested in the outer pipe. The inner pipe is used to simulate a drill string, and the outer pipe is used to simulate a well wall or a casing. The visual pipe string module is made of a visual and pressure-resistant and temperature-resistant material. The connection module is used to connect a plurality of pipe string sections when the simulated wellbore of the visual pipe string module comprises the plurality of pipe string sections. The plurality of pipe strings can be combined to simulate different well walls and casing conditions. The rotation control module is used to rotate the inner pipe.

[0007] a circulating system connected with the inner tube inlet and the outer tube outlet of the simulated wellbore system, the circulating system comprising a liquid-phase circulating module, a gas-phase injection module and a solid-phase injection module; the circulating system is used for solid-liquid separation and gas-liquid separation of the fluid at the outlet of the simulated wellbore system, and the separated liquid is replenished and added with solid-phase particles and then injected into the inlet of the simulated wellbore system again;

[0008] a working condition simulation system connected with the multiple measuring points distributed on the simulated wellbore respectively, the working condition simulation system being used for simulating a lost circulation condition, an overflow condition and a gas invasion condition;

[0009] an automatic control system used for simulation control of the inclination angle of the pipe string, and simulation control of pressure, flow rate and temperature in the circulating system and the simulated wellbore system, so as to obtain data of measuring accuracy, moving posture and depth position under different flow states;

[0010] a data monitoring system used for monitoring temperature, pressure and flow rate of each measuring point of the simulated wellbore system, and generating wellbore temperature and pressure profile data.

[0011] In an embodiment, at least one pipe string in the simulated wellbore system comprises at least one variable-diameter horizontal pipe section and at least one variable-diameter vertical pipe section.

[0012] The rotation control module comprises a rotary motor and a motor controller.

[0013] The connecting module comprises a bend connecting device of the horizontal pipe section and the vertical pipe section, a connector of the rotary motor and the inner tube, 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 bend connecting device.

[0015] In an embodiment, the liquid-phase circulating module in the circulating system comprises a liquid storage tank, a liquid replenishing pump, and a solid-liquid separator, a gas-liquid separator and a liquid circulating pump connected in sequence through a pipeline; wherein:

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

[0017] The liquid storage tank has the functions of heating and stirring, and is used for preparing fluid required by the experiment.

[0018] The solid-liquid separator and the gas-liquid separator are connected with the outlet of the simulated wellbore system through the pipeline.

[0019] The liquid circulating pump is arranged on a pipeline between an inlet of the simulated wellbore system and the solid-liquid separator and the gas-liquid separator.

[0020] The liquid supplementing power pump is connected with the liquid storage tank and pumps sufficient liquid-phase fluid from the liquid storage tank to the pipeline to supplement the liquid-phase fluid in the pipeline.

[0021] In an embodiment, the gas-phase injection module in the circulating system comprises a gas source and a gas flow controller.

[0022] The gas source and the gas flow controller are connected through a gas injection pipeline.

[0023] The number of the gas-phase injection module in the circulating system is one or more, and the corresponding measuring point is connected during the experiment, and the gas is injected into the circulating system through the measuring point.

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

[0025] In an embodiment, the solid-phase injection module in the circulating system comprises a solid-phase particle storage and delivery device.

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

[0027] In an embodiment, the working condition simulation system comprises a lost circulation simulation module and an overflow simulation module, and wherein:

[0028] The lost circulation simulation module comprises a joint, a valve and a discharge pipeline, and the overflow simulation module comprises a joint, a valve, a liquid injection channel and a gas injection channel.

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

[0030] The liquid injection channel and the gas injection channel are connected to the measuring point of the simulated wellbore system through the joint and the valve.

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

[0032] The liquid injection channel cooperates with the liquid supplementing power pump to supplement the fluid in the pipeline.

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

[0034] In an embodiment, the automatic control system comprises a well inclination control module, a temperature variation control module, a pressure control module and a flow adjustment module.

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

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

[0037] The pressure control module comprises a liquid supplementing power pump, a circulating power pump and a variable pressure valve;

[0038] The flow regulating module comprises 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 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 for liquid circulation through a joint and a valve;

[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 and delivery device through a joint and a valve.

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

[0044] The temperature monitoring module comprises 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 column section;

[0045] The pressure monitoring module comprises 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 column section;

[0046] The flow monitoring module comprises 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 column section.

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

[0048] The image detection module comprises a camera, a camera sliding rail and a host computer connected with the camera;

[0049] The camera is installed on a camera sliding rail, and faces the simulated wellbore system, for shooting the experiment process and transmitting to the upper computer.

[0050] In a second aspect, the embodiment of the present application provides a method for simulating working conditions, comprising: using the visual variable temperature and pressure simulation experiment system as described above to perform working condition simulation and data monitoring.

[0051] The beneficial effects of the above technical solutions provided by the embodiments of the present application at least include:

[0052] In the visual variable temperature and pressure simulation experiment system provided by the embodiments of the present application, the simulated wellbore system adopts the structure of the inner tube nested in the outer tube, and uses visual materials resistant to temperature and pressure. Unlike the traditional multiphase flow test circulating pipeline, the embodiments of the present application have the characteristics of visualization, pressure resistance, temperature resistance and multifunctional adjustment. Moreover, due to the structural feature that the inner tube is nested in the outer tube, the system can well simulate the circulating flow under the condition of the drilling pipe in the pipe, and can realize the physical simulation of the real drilling working condition in the laboratory, and reproduce the wellbore annulus flow field under the condition of the drilling string rotation. By distributed heating and pressurization, a segmented variable temperature and pressure simulation environment is established, the working condition simulation system can simulate downhole gas invasion, overflow and loss, and provide the simulation capability of the downhole gas invasion and loss complex working condition. The data monitoring system is used for monitoring the temperature, pressure and flow of each measuring point of the simulated wellbore system, and generating wellbore temperature and pressure profile data. The automatic control system combined with the data monitoring system can also obtain data such as measurement accuracy, moving posture, depth position and the like under different flow states. The embodiments of the present application can provide support conditions for the optimization design of the shell and components of the micro measuring device, and the model method test verification of depth positioning and error processing, and further provide new technical means for realizing the identification of downhole complex working conditions and the safety control of wellbore pressure based on the accurate characterization of wellbore temperature and pressure profile.

[0053] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and achieved by the structure particularly pointed out in the written description, claims, and drawings.

[0054] The technical solutions of the present application will be further described in detail below by means of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

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

[0056] Figure 1It is a structure schematic diagram of a visual variable temperature and pressure simulation experiment system in the embodiment of the present application. DETAILED DESCRIPTION

[0057] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0058] In order to improve the technical level of the micro measuring device, it is necessary to carry out indoor experimental research before further field application, and to establish a set of indoor circulating pipeline device with the functions of local pressure sealing, segmented temperature control, downhole complex simulation, etc. The measurement accuracy correction method, motion mechanism and hydrodynamic characteristics of the tool under different working conditions are explored and researched.

[0059] Based on this, the embodiment of the present application provides a visual variable temperature and pressure simulation experiment system, as shown in Figure 1 The simulation wellbore system, the circulation system, the working condition simulation system, the automatic control system and the data monitoring system, wherein:

[0060] The simulation wellbore system comprises a visual pipe string module, a rotation control module and a connecting module. The visual pipe string module comprises at least one pipe string section, and a plurality of measuring points are arranged on the at least one pipe string section. Each pipe string section comprises a visual inner pipe and an outer pipe. The inner pipe is nested in the outer pipe. The inner pipe is used for simulating a drill string, and the outer pipe is used for simulating a well wall or a casing. The visual pipe string module is made of a visual and pressure-resistant and temperature-resistant material. The connecting module is used to connect a plurality of pipe string sections when the wellbore simulated by the visual pipe string module comprises a plurality of pipe string sections. A plurality of pipe strings can be combined to simulate different well walls and casing conditions. The rotation control module is used to rotate the inner pipe.

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

[0062] The circulation system is connected with the inner pipe inlet and the outer pipe outlet of the simulation wellbore system. The circulation system comprises a liquid phase circulation module, a gas phase injection module and a solid phase injection module. The circulation system is used to separate the fluid at the outlet of the simulation wellbore system into liquid and gas, and to circulate and inject the separated liquid and the solid phase particles into the inlet of the simulation wellbore system again after supplementing the liquid and adding the solid phase particles.

[0063] The circulation system mainly realizes the circulation of liquid and solid phases between the inlet and the outlet of the simulation wellbore system, so as to simulate the real annular flow field of the wellbore.

[0064] The circulation process is that the fluid passes through the inlet of the simulated wellbore system, sequentially passes through each measuring point, then passes through the annulus, circulates back, passes through the outlet, and then enters the circulation system to realize closed loop.

[0065] The working condition simulation system is connected with the multiple measuring points distributed on the simulated wellbore, and is used for simulating the lost circulation condition, the overflow condition and the gas invasion condition.

[0066] The working condition simulation system can simulate different complex conditions such as lost circulation, overflow and gas invasion through gas-liquid injection or gas-liquid discharge (overflow).

[0067] The automatic control system is used for controlling the simulation control of the inclination angle of the pipe string section, and the simulation control of the pressure, flow and temperature in the circulation system and the simulated wellbore system, so as to obtain the data of the measurement accuracy, the moving posture and the depth position under different flow states.

[0068] The data monitoring system is used for monitoring the temperature, pressure and flow of each measuring point of the simulated wellbore system, and generating the wellbore temperature and pressure profile data.

[0069] In the above-mentioned visual variable temperature and pressure simulation experiment system, the simulated wellbore system adopts the structure of the inner pipe nested in the outer pipe, and adopts the visual material resistant to temperature and pressure. Different from the traditional multiphase flow test circulation pipeline, the embodiment of the present application has the characteristics of visualization, pressure resistance, temperature resistance and multifunctional adjustment. Moreover, since the system adopts the structure feature that the inner pipe is nested in the outer pipe, the circulation flow under the condition of the drilling pipe in the pipe can be well simulated, the physical simulation of the real drilling working condition in the laboratory can be realized, and the wellbore annulus flow field under the condition of the rotating drilling string can be reproduced in the indoor laboratory condition. The segmented variable temperature and pressure simulation environment is established through distributed heating and pressurization, the working condition simulation system can simulate the downhole gas invasion, overflow and lost circulation, and provide the simulation capability of the downhole gas invasion and lost circulation complex conditions. The data monitoring system is used for monitoring the temperature, pressure and flow of each measuring point of the simulated wellbore system, and generating the wellbore temperature and pressure profile data. The automatic control system combined with the data monitoring system can also obtain the data of the measurement accuracy, the moving posture and the depth position under different flow states. The embodiment of the present application can provide support conditions for the optimization design of the shell and components of the micro measuring device, the depth positioning, error processing and other model method test verification, and further provide new technical means for realizing the downhole complex condition identification and wellbore pressure safety control based on the accurate characterization of the wellbore temperature and pressure profile.

[0070] The above-mentioned visual temperature-resistant and pressure-resistant material includes but is not limited to: organic glass, high-strength resin and other transparent materials.

[0071] The inner pipe and the outer pipe can adopt 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, and the embodiments of the present application are not limited.

[0073] The structure and function of the visual variable-temperature pressure simulation experiment system provided by the embodiments of the present application will be described in detail below with reference to the drawings.

[0074] Referring to Figure 1 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.

[0075] The rotation control module includes a rotating motor and a motor controller.

[0076] The connection module includes a bend connection device of the horizontal pipe section and the vertical pipe section, a connector of the rotating motor and the inner tube, and a control pipeline connector.

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

[0078] For example, the horizontal pipe section and the vertical pipe section are connected through a pressure-resistant elbow component.

[0079] The simulated wellbore system can include horizontal pipe sections and vertical pipe sections, but in the specific experiment process, the simulated wellbore can realize flexible disassembly of the horizontal section and the vertical section, complete simulation of the single horizontal section and the single vertical section. Specifically, according to the needs of the experiment, the horizontal pipe section can be used to simulate the wellbore, or the vertical pipe section can be used to simulate the wellbore, or the horizontal pipe section and the vertical pipe section can be connected to form the simulated wellbore in various ways.

[0080] The outer tube can simulate the well wall or the casing, and the inner tube can simulate the drill string, and by setting different pipe diameter sizes, the effect of simulating different open wellbores and drill strings can be achieved.

[0081] Specifically, in the rotation control module, the rotating motor is driven to rotate the horizontal pipe section 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 supplementing 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, the gas-liquid separator, and the liquid circulation pump connected in sequence are connected with the outlet and the inlet of the simulated wellbore system through the pipelines, respectively.

[0084] The liquid storage tank has the functions of heating and stirring, and is used to prepare the fluid required by the experiment.

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

[0086] The liquid circulating 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 supplementing power pump is used to be connected with the liquid storage tank and pump out sufficient liquid phase fluid from the liquid storage tank to the pipeline to supplement the liquid phase fluid in the pipeline.

[0088] The pipeline mainly refers to the pipeline between the inlet and the outlet of the simulated wellbore system.

[0089] The gas phase injection module in the circulating system comprises a gas source and a gas flow controller;

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

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

[0092] Specifically, although Figure 1 The number of the gas phase injection module in the circulating system is one or more in the specific implementation, and in the experiment, the corresponding measuring point is connected to inject gas into the circulating system through the measuring point.

[0093] The gas flow controller is used to control the speed of injecting gas into the pipeline.

[0094] In one embodiment, the solid phase injection module in the circulating system comprises a solid phase particle storage and delivery device.

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

[0096] The solid phase particles include but are not limited to solid phase particles such as sand.

[0097] In one embodiment, the working condition simulation system comprises a loss simulation module and an overflow simulation module; wherein:

[0098] The loss simulation module comprises a joint, a valve and a discharge pipeline; and the overflow simulation module comprises a joint, a valve, a liquid injection channel and a gas injection channel.

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

[0100] The liquid injection channel and the gas injection channel are connected to each measuring point 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 is matched with the liquid supplementing power pump to supplement the fluid in the pipeline.

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

[0104] Figure 1 The discharge pipeline and the liquid injection channel and the gas injection channel shown in the figure can be multiple to be connected to the measuring points during the experiment, to supplement the liquid, inject gas and discharge the liquid in the pipeline for the wellbore simulation system.

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

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

[0107] The temperature change control module comprises a hot runner heating rod.

[0108] The pressurization control module comprises a liquid supplementing power pump, a circulating power pump and a pressure change valve.

[0109] The flow regulation module comprises 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 in 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 for gas injection through the joint and the 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 liquid circulation pipeline through the joint and the valve;

[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 and delivery device through the joint and the valve.

[0114] The automatic control system can realize the automatic injection of different phase fluids in different working conditions, the heating and pressurization of the pipe column and other functions.

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

[0116] The temperature monitoring module comprises: 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 column segment;

[0117] The pressure monitoring module comprises: 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 column segment;

[0118] The flow monitoring module comprises: 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 column segment.

[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; and the mass flow meter and the flow acquisition card are connected through a four-way valve, a flange, and a pipe column.

[0120] By erecting multiple temperature sensors, the temperature at different positions (different measuring points) of the pipe column is measured to realize full-pipe-column temperature field measurement; by erecting multiple pressure sensors, the pressure at different positions (different measuring points) of the pipe column is measured to realize full-pipe-column pressure field measurement; and by erecting a mass flow meter, the flow size in the pipe column is measured.

[0121] In one embodiment, the above-mentioned data monitoring system further comprises: an image detection module;

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

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

[0124] The experimental process is shot into multimedia information such as a video and a photo, and is transmitted to the host computer to facilitate corresponding multimedia data saving, 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 visual variable-temperature pressure simulation experiment system provided by the embodiments of the present application has at least the following technical features:

[0127] 1) The visualization of the pipe-in-pipe structure can realize wellbore annulus flow field reproduction under the condition of drill string rotation to realize real simulation of the wellbore annulus flow field.

[0128] Further, the flow pattern of the gas-liquid two-phase flow in the annulus is identified by a high-speed camera, and experimental testing and fluid mechanics research of the downhole operation tool such as the micro gauge under different flow patterns are carried out.

[0129] 2) The pressurized section is arranged at different positions in the pipe string to simulate the real pressure state downhole, and the circulation wellbore pressure is effectively controlled. The pressure function test of the downhole operation tool such as the micro gauge is supported, and the pressure measurement function and the pressure measurement accuracy of the downhole operation tool such as the micro gauge are determined through the test, so as to realize the circulation wellbore pressure regulation and control.

[0130] 3) The heating and heat preservation device is arranged at different positions in the pipe string to effectively control the temperature of each part of the pipe string, and the temperature change characteristics downhole are simulated. The temperature function test of the downhole operation tool such as the micro gauge is supported, and the temperature measurement function and the temperature measurement accuracy of the downhole operation tool such as the micro gauge are determined through the test.

[0131] 4) In the embodiment of the present application, the pipe string in the simulated wellbore system is designed as a multi-size variable-diameter pipe string, so that the simulated pipe string conforms to the size of most wellbores and matching drill strings. The multi-size variable-diameter pipe string realizes the functions of straight well simulation, horizontal well simulation and multi-trip wellbore simulation, and provides the variable-diameter experimental testing capability for the downhole operation tool such as the micro gauge.

[0132] 5) In the embodiment of the present application, the multi-phase flow injection control and the leakage point arranged at each position of the pipe string are adopted to simulate the downhole complex working conditions such as overflow and leakage. The downhole operation tool such as the micro gauge is used to carry out the visual simulation experiment of the complex working conditions such as overflow and leakage, the dynamic, temperature, pressure and other multi-physical field parameters under different working conditions are measured, the wellbore temperature and pressure profile data are generated based on this, the identification and calculation method of the downhole complex working conditions is established, and the intelligent identification and judgment function of the micro gauge under the complex working conditions is realized.

[0133] In order to better illustrate the visual variable temperature and pressure simulation experiment system provided by the embodiment of the present application, the following examples are taken to illustrate the embodiment of the present application:

[0134] Embodiment one:

[0135] ① Simulated wellbore system: the simulated wellbore system includes a vertical pipe section and a horizontal pipe section (such as Figure 1 ), the outer pipe of the vertical pipe section is made of organic glass material, the inner pipe is made of 304 stainless steel material, the pressure resistance is 5 MPa, the middle section of the inner pipe is provided with a hot runner electric heating device, and the heating output is above 200 DEG C; the inner and outer pipes of the horizontal pipe section are all made of organic glass material, and are provided with a hot runner electric heating device, the inner pipe is connected with a rotary motor and a motor controller; the elbow of the horizontal pipe section and the vertical pipe section is connected through a flange, and the flange is connected with a ball valve.

[0136] ②Circulation system: mainly includes liquid phase circulation module, gas injection module and solid phase 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 circulating 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 variable frequency control of the flow through a frequency converter. The solid-liquid separator has a volume of 50L and a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L and 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 supplement pipeline and a DN15 manual valve.

[0137] ③Working condition simulation system: including leakage joint and control valve, gas injection channel, solid-liquid separator, gas-liquid separator, etc. The replaceable leakage joint is installed inside the leakage interface flange for leakage test; the control valve uses a DN15 ball valve to control the leakage speed. The gas injection channel is located in the metal flange reserved interface, with 4 interface injection in the circumferential direction, interface size 3 / 8NPT, and compressed air injection flow rate of 300L / s, which can be quantitatively input.

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

[0139] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operation 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 flowmeter 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 gimbal, a tripod, high-speed acquisition software and a motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and the data is automatically stored and backed up.

[0140] Example two:

[0141] ①Simulated wellbore system: the simulated wellbore system includes a horizontal pipe section, the inner and outer pipes of which are made of organic glass material, provided with a hot runner electric heating device, and the inner pipe is connected with a rotary motor and a motor controller.

[0142] ②Circulation system: mainly includes liquid phase circulation module, gas injection module and solid phase 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 circulating 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 variable frequency control of the flow through a frequency converter. 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 supplement pipeline and a DN15 manual valve.

[0143] ③Working condition simulation system: including leakage joint and control valve, gas injection channel, solid-liquid separator, gas-liquid separator, etc. The replaceable leakage joint is installed inside the leakage interface flange for leakage test; the control valve uses a DN15 ball valve to control the leakage speed. The gas injection channel is located in the metal flange reserved interface, with 4 interface injection in the circumferential direction, interface size 3 / 8NPT, and compressed air injection flow rate of 300L / s, which can be quantitatively input.

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

[0145] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operation 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 flowmeter 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 gimbal, a tripod, high-speed acquisition software and a motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and the data is automatically stored and backed up.

[0146] Example three:

[0147] ①Simulated wellbore system: the simulated wellbore system includes a vertical pipe section, the outer pipe of which is made of organic glass, and the inner pipe is made of 304 stainless steel, with a pressure resistance of 5MPa. The inner pipe is provided with a hot runner electric heating device in the middle section, with a heating output of 200℃ or above. The inner pipe is connected with a rotary 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 storage tank is made of 304 stainless steel, with a volume of 1000L and a maximum working temperature of 200℃. The liquid circulating 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 variable frequency control of the flow through a frequency converter. The solid-liquid separator has a volume of 50L and 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 supplement pipeline and a DN15 manual valve.

[0149] ③Working condition simulation system: including leakage joint and control valve, gas injection channel, solid-liquid separator, gas-liquid separator, etc. The replaceable leakage joint is installed inside the leakage interface flange for leakage test; the control valve uses a DN15 ball valve to control the leakage speed. The gas injection channel is located in the metal flange reserved interface, with 4 interface injection in the circumferential direction, interface size 3 / 8NPT, and compressed air injection flow rate of 300L / s, which can be quantitatively input.

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

[0151] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operation 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 flowmeter 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 gimbal, a tripod, high-speed acquisition software and a motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and the data is automatically stored and backed up.

[0152] Example Four:

[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 tube segment is made of organic glass, the inner tube 304 is made of stainless steel, and the pressure resistance is 5 MPa. The middle section of the inner tube is provided with a hot runner electric heating device, and the heating output is above 200 DEG C. The inner and outer tubes of the horizontal tube segment are all made of organic glass, and are provided with a hot runner electric heating device. The inner tube is connected with a rotating motor and a motor controller. The elbow of the horizontal tube segment and the vertical tube segment is connected through a flange, and the flange is connected with a ball valve. The lower part of the horizontal tube segment is provided with an elevator, a hydraulic pump and an elevator controller, so that the simulation of any inclination angle of the inclined shaft section can be realized.

[0154] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase 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 DEG C. The liquid circulating pump adopts a high temperature and high pressure magnetic pump, with a maximum working pressure of 20 MPa, a temperature resistance of 200 DEG C, a maximum displacement of 100L / s, and a variable frequency accurate control flow through a frequency converter. The solid-liquid separator has a volume of 50L and a working pressure of 20 MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L and a working pressure of 20 MPa, 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 supplement pipeline and a DN15 manual valve.

[0155] ③Working condition simulation system: including leakage joint and control valve, gas injection channel, solid-liquid separator, gas-liquid separator, etc. The replaceable leakage joint is installed inside the leakage interface flange for leakage test; the control valve uses a DN15 ball valve to control the leakage speed. The gas injection channel is located in the metal flange reserved interface, and 4 interfaces are injected in the circumferential direction, with an interface size of 3 / 8NPT and a maximum compressed air injection flow of 300L / s, which can be quantitatively input.

[0156] ④Automatic control system: the heating device adopts a hot runner heater, which is wound on the outer wall of the inner tube through a metal flange interface, and is equipped with a temperature control instrument with PID adjustment function, mainly used for heating and temperature control of the liquid storage tank. The frequency converter is mainly used for liquid circulating pump flow regulation, with a power of 100kW. The back pressure valve controls the pressure of 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 operation system. Temperature sensor range -50℃-260℃, accuracy ±0.1℃. Pressure sensor range 25MPa, accuracy: 0.1%. Mass flow meter range 0-100000kg / h, accuracy: ±0.2%. High-speed camera uses high-speed motion acquisition instrument, which is equipped with 105mm macro lens, 300W light source, gimbal, tripod, high-speed acquisition software and motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and the data is automatically stored and backed up.

[0158] Example five:

[0159] 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 organic glass material, the inner pipe is made of 304 stainless steel material, the pressure resistance is 5MPa, the middle section of the inner pipe is provided 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 organic glass material, and are provided with a hot runner electric heating device, the inner pipe is connected with a rotating motor and a motor controller; the elbow of the horizontal pipe section and the vertical pipe section is connected through a flange, and the flange is connected with a ball valve; the lower part of the horizontal pipe section is provided with an elevator, a hydraulic pump and an elevator controller, so that the simulation of any inclination angle of the inclined well section can be realized.

[0160] ②Circulation system: mainly including liquid phase circulation module, gas phase injection module and solid phase 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 circulating 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 variable frequency control of the flow through a frequency converter. The solid-liquid separator has a volume of 50L and a working pressure of 20MPa, and is made of 304 stainless steel. The gas-liquid separator has a volume of 300L and 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 supplement pipeline and a DN15 manual valve.

[0161] ③Working condition simulation system: including leakage joint and control valve, gas injection channel, solid-liquid separator, gas-liquid separator, etc. The replaceable leakage joint is installed inside the leakage interface flange for leakage test; the control valve uses a DN15 ball valve to control the leakage speed, and the leakage joint and the valve are connected with the discharge pipeline through the flange.

[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, mainly used for heating and temperature control of the liquid storage tank. The frequency converter is mainly used for flow regulation of the liquid circulating pump, with a power of 100 kW. The back pressure valve controls the pressure of 0-1500 psi, with a 1 / 2NPT interface and a CV of 0.6.

[0163] (5) Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operation system. The temperature sensor has a range of -50°C to 260°C and an accuracy of ±0.1°C. The pressure sensor has a range of 25 MPa and an accuracy of 0.1%. The mass flow meter has a range of 0-100000 kg / 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 gimbal, a tripod, high-speed acquisition software and a motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and the data is automatically stored and backed up.

[0164] Example Six:

[0165] (1) Simulated wellbore system: The simulated wellbore system includes vertical pipe sections and horizontal pipe sections (e.g. Figure 1 ). The outer tube of the vertical pipe section is made of organic glass, and the inner tube is made of 304 stainless steel with a pressure resistance of 5 MPa. A hot runner electric heating device is provided in the middle section of the inner tube, which can heat up to 200°C or above. The horizontal pipe section is made of organic glass, and a hot runner electric heating device is provided. The inner tube is connected to a rotating motor and a motor controller. The elbow of the horizontal pipe section is connected to the vertical pipe section through a flange, and the flange is connected to a ball valve.

[0166] (2) Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase injection module. The liquid storage tank is made of 304 stainless steel with a volume of 1000L and a maximum working temperature of 200°C. The liquid circulating pump uses a high temperature and high pressure magnetic pump with a maximum working pressure of 20MPa, a temperature resistance of 200°C, a maximum displacement of 100L / s, and a frequency conversion precision control flow through a frequency converter. The solid-liquid separator has a volume of 50L and a working pressure of 20MPa, made of 304 stainless steel. The gas-liquid separator has a volume of 300L and a working pressure of 20MPa, 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 supplement pipeline and a DN15 manual valve.

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

[0168] ④Automatic control system: heating device uses hot runner heater, which is wrapped around the outer wall of the inner tube through the metal flange interface, equipped with temperature control instrument with PID adjustment function, mainly used for heating and temperature control of the liquid storage tank. Frequency converter is mainly used for liquid circulating pump flow regulation, power 100kW. Back pressure valve control 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 operation system. Temperature sensor range-50℃-260℃, accuracy ±0.1℃. Pressure sensor range 25MPa, accuracy: 0.1%. Mass flowmeter range 0-100000kg / h, accuracy: ±0.2%. High-speed motion acquisition instrument is equipped with 105mm macro lens, 300W light source, pan-tilt, tripod, high-speed acquisition software and motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and data is automatically stored and backed up.

[0170] Example Seven:

[0171] ①Simulated wellbore system: the simulated wellbore system includes vertical pipe section and horizontal pipe section (such as Figure 1 ), the vertical pipe section has adjustable inner tube diameter range 80mm-450mm and adjustable outer tube diameter range 120mm-600mm; the horizontal pipe section has adjustable inner tube diameter range 50mm-300mm and adjustable outer tube diameter range 80mm-450mm; the vertical pipe section outer tube is made of organic glass, and the inner tube is made of 304 stainless steel, with pressure resistance 5MPa, and the middle section of the inner tube is provided with hot runner electric heating device with heating output above 200℃; the horizontal pipe section inner and outer tubes are all made of organic glass, and are provided with hot runner electric heating device, and the inner tube is connected with rotary motor and motor controller; the horizontal pipe section and the vertical pipe section elbow are connected through flange, and the flange is connected with ball valve.

[0172] ②Circulation system: mainly includes liquid phase circulation module, gas phase injection module and solid phase 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 circulating 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 variable frequency control of flow through a frequency converter. 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 supplement pipeline and a DN15 manual valve.

[0173] ③Working condition simulation system: including leakage joint and control valve, gas injection channel, solid-liquid separator, gas-liquid separator, etc. The replaceable leakage joint is installed inside the leakage interface flange for leakage test; the control valve uses a DN15 ball valve to control the leakage speed. The gas injection channel is located in the metal flange reserved interface, with 4 interface injection in the circumferential direction, and the interface size is 3 / 8NPT, with a maximum compressed air injection flow of 300L / s, which can be quantitatively input.

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

[0175] ⑤Data monitoring system: including temperature sensor, pressure sensor, high-speed camera (high-speed motion acquisition instrument) and automatic control operation 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 flowmeter 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 gimbal, a tripod, high-speed acquisition software and a motion control guide rail. All pressure, flow, temperature, outlet control and other values are collected through the automatic control operation system, and the data is automatically stored and backed up.

[0176] Based on the same inventive concept, the embodiments of the present application also provide a working condition simulation method, which uses the visual variable temperature and pressure simulation experiment system as described above to perform working condition simulation and data monitoring.

[0177] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A visualizing variable temperature press simulation experiment system, characterized in that, The simulation wellbore system comprises a circulating system, a working condition simulation system, an automatic control system and a data monitoring system, wherein: The simulation wellbore system comprises a visual pipe string module, a rotation control module and a connecting module, the visual pipe string module comprises at least one pipe string section, the at least one pipe string section is provided with a plurality of measuring points, each pipe string section comprises a visual inner pipe and an outer pipe, the inner pipe is nested in the outer pipe, the inner pipe is used for simulating a drill string, and the outer pipe is used for simulating a well wall or a casing; the visual pipe string module is made of visual and pressure-resistant and temperature-resistant materials; the connecting module is used for connecting a plurality of pipe string sections in the case that the wellbore simulated by the visual pipe string module comprises the plurality of pipe string sections; the plurality of pipe strings can be combined to simulate different well wall and casing conditions; and the rotation control module is used for rotating the inner pipe; The circulating system is connected with an inlet of the inner pipe and an outlet of the outer pipe of the simulation wellbore system, and the circulating system comprises a liquid-phase circulating module, a gas-phase injection module and a solid-phase injection module; the circulating system is used for separating fluid at the outlet of the simulation wellbore system into solid and liquid phases and into gas and liquid phases, and is used for supplementing liquid and adding solid particles to the separated liquid and then recycling and injecting the liquid into the inlet of the simulation wellbore system again; The working condition simulation system is connected with a plurality of measuring points distributed on the simulation wellbore respectively, and is used for simulating lost circulation conditions, overflow conditions and gas invasion conditions; The automatic control system is used for simulating and controlling the inclination angle of the pipe string section, and is used for simulating and controlling the pressure, flow and temperature in the circulating system and the simulation wellbore system, so as to obtain data of measuring accuracy, moving posture and depth position under different flow states; The data monitoring system is used for monitoring the temperature, pressure and flow of each measuring point of the simulation wellbore system, and is used for generating wellbore temperature and pressure profile data. At least one pipe string section in the simulation wellbore system comprises at least one variable-diameter horizontal pipe section and at least one variable-diameter vertical pipe section; 2. The system of claim 1, wherein, The rotation control module comprises a rotating motor and a motor controller; The connecting module comprises a bend connecting device of the horizontal pipe section and the vertical pipe section, a connector of 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; and the horizontal pipe section and the vertical pipe section are connected through the bend connecting device. The liquid-phase circulating module in the circulating system comprises a liquid storage tank, a liquid supplementing pump and a solid-liquid separator, a gas-liquid separator and a liquid circulating pump connected in sequence through a pipeline; wherein:

3. The system of claim 2, wherein, The solid-liquid separator, the gas-liquid separator and the liquid circulating pump connected in sequence are connected with the outlet and the inlet of the simulation wellbore system through the pipeline respectively; The liquid storage tank has the functions of heating and stirring, and is used for preparing fluid required by experiments; The solid-liquid separator and the gas-liquid separator are connected with the outlet of the simulation wellbore system through the pipeline; The liquid circulating pump is arranged on the pipeline between the inlet of the simulation wellbore system and the solid-liquid separator and the gas-liquid separator. ​ The liquid supplementing power pump is connected with the liquid storage tank and pumps sufficient liquid phase fluid from the liquid storage tank to the pipeline to supplement the liquid phase fluid in the pipeline.

4. The system of claim 1, wherein, The gas phase injection module in the circulation system comprises a gas source and a gas flow controller. The gas source and the gas flow controller are connected through a gas injection pipeline. The number of the gas phase injection module in the circulation system is one or more, and the gas phase injection module is connected with a corresponding measuring point during an experiment to inject gas into the circulation system through the measuring point. The gas flow controller is configured to control the speed of injecting gas into the pipeline.

5. The system of claim 3, wherein, The solid phase injection module in the circulation system comprises 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 supplementing power pump, and is configured to deliver solid phase particles into the pipeline during the experiment.

6. The system of claim 3, wherein, The working condition simulation system comprises a loss simulation module and an overflow simulation module, wherein: The loss simulation module comprises a joint, a valve and a discharge pipeline, and the overflow simulation module comprises a joint, a valve, a liquid injection channel and a gas injection channel. The discharge pipeline is connected to the measuring point of the simulated wellbore system through the joint and the valve. The liquid injection channel and the gas injection channel are connected to the measuring point of the simulated wellbore system through the joint and the valve. The discharge pipeline is configured to discharge fluid in the pipeline. The liquid injection channel cooperates with the liquid supplementing power pump to supplement fluid in the pipeline. The gas injection channel is configured to inject gas into the pipeline.

7. The system of claim 6, wherein, The automatic control system comprises a well inclination angle control module, a temperature change control module, a pressurization control module and a flow adjustment module. The well inclination angle control module comprises a coupling, an elevator and a valve, and the elevator is arranged at the bottom of the horizontal pipe section to simulate an arbitrary well inclination angle of the inclined well section. The temperature change control module comprises a hot runner heating rod. The pressurization control module comprises a liquid supplementing power pump, a circulation power pump and a pressure change valve. The flow adjustment module comprises a gas flow controller, a liquid flow controller and a solid flow controller. The hot runner heating rod is configured to realize a heating function in the circulation process. The gas flow controller is configured to realize a gas flow control function in the circulation process. The liquid flow controller is configured to realize a liquid flow control function in the circulation process. The solid flow controller is configured to realize a solid flow control function in the circulation process.

8. The system of claim 1, wherein, The data monitoring system comprises a temperature monitoring module, a pressure monitoring module and a flow monitoring module, wherein: The temperature monitoring module comprises a temperature sensor, a temperature control instrument and a temperature acquisition card, and is connected through a four-way valve, a flange and a pipe section. The pressure monitoring module comprises a pressure sensor, a pressure display instrument and a pressure acquisition card, and is connected through a four-way valve, a flange and a pipe section. The temperature monitoring module comprises a temperature sensor, a temperature control instrument and a temperature acquisition card, and is connected through a four-way valve, a flange and a pipe section. The flow monitoring module comprises 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 column segment.

9. The system of claim 8, wherein, The data monitoring system further comprises an image detection module. The image detection module comprises a camera, a camera slide rail and a host computer connected to the camera. The camera is installed on the camera slide rail and faces the simulated shaft system, and is used for shooting the experiment process and transmitting the shooting result to the host computer.

10. A method of operating condition simulation, characterized by, The method comprises: Performing working condition simulation and data monitoring by using the visual variable temperature and pressure mold simulation experiment system according to any one of claims 1-9.

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