Underground gas-liquid-solid three-phase fluid simulation detection device

Abstract

The invention discloses an underground gas-liquid-solid three-phase fluid simulation detection device which comprises a simulation shaft and a simulation drill rod installed in the simulation shaft, a drill rod motor is installed at the top of the simulation drill rod, a supporting bearing is installed at the bottom of the drill rod, and the underground gas-liquid-solid three-phase fluid simulation detection device comprises a gas cylinder set, a gas mixing chamber, a liquid storage tank, a pump set, a heater and a pressurizer. The gas cylinder set is connected with a gas inlet in the bottom of the simulation shaft through a gas mixing chamber, the lower end of the liquid storage tank is connected with a liquid inlet in the bottom of the simulation shaft through a pump set, a heater and a pressurizer which are sequentially connected, and a gas monitoring nipple is installed in the middle of the simulation drill rod. The device has high precision and reliability, monitoring and analysis of underground multi-component gas while drilling are achieved, and reliable experimental technical support is provided for well drilling gas cut monitoring. The experimental device is reasonable in design, simple in structure, easy to operate and maintain and high in safety performance, and the personal safety of experimenters and the integrity of equipment can be guaranteed.

Description

Technical Field

[0001] The invention relates to the field of drilling equipment, in particular to an underground gas-liquid-solid three-phase fluid simulation detection device. Background Art

[0002] In the field of oil and gas development, drilling is an important process. However, during the drilling process, there are a lot of solids and liquids in the wellbore, and formation gas is also easy to invade the wellbore, causing the gas to mix in the wellbore annulus to form a gas-liquid-solid three-phase flow. Gas intrusion is one of the important causes of drilling accidents such as wellbore instability and blowout. Therefore, in the process of downhole drilling, timely and accurate monitoring and identification of the type of gas intrusion and the annular concentration are of great significance to ensure drilling safety, improve drilling efficiency and reduce drilling costs.

[0003] At present, only gas intrusion can be detected separately. In the field of gas intrusion monitoring, the drilling fluid pool level detection method (drilling fluid increment method), flow difference overflow detection method, acoustic gas intrusion monitoring method and other methods are usually used. The ultrasonic-based downhole gas intrusion detection system is to add an ultrasonic monitoring device to the drill pipe, and use it in conjunction with a turbine and a gas-solid separation device. Although the acoustic wave method has a faster response speed compared to the drilling fluid pool level detection method and the flow difference overflow detection method, its accuracy and technical defects are also obvious. The drilling fluid pool level detection method and the flow difference overflow detection method have low monitoring accuracy and relatively slow speed in generating gas intrusion responses.

[0004] Therefore, how to provide an underground gas-liquid-solid three-phase fluid simulation detection device that can simulate gas-liquid-solid three-phase flow conditions is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide an underground gas-liquid-solid three-phase fluid simulation detection device, which can simulate the gas-liquid-solid three-phase flow situation and realize precise control of the gas mixing ratio and flow rate, thereby improving the accuracy and practicality of gas mixing and detection.

[0006] In order to solve the above technical problems, the present invention provides a downhole gas-liquid-solid three-phase fluid simulation detection device, including a simulated wellbore and a simulated drill pipe installed inside the simulated wellbore, a drill pipe motor is installed on the top of the simulated drill pipe, and a support bearing is installed on the bottom of the drill pipe. It includes a gas cylinder group, a gas mixing chamber, a liquid storage tank, a pump group, a heater and a pressurizer. The gas cylinder group is connected to the gas inlet at the bottom of the simulated wellbore through the gas mixing chamber, and the lower end of the liquid storage tank is connected to the liquid inlet at the bottom of the simulated wellbore through the pump group, the heater and the pressurizer connected in sequence, and a gas monitoring short section is installed in the middle of the simulated drill pipe.

[0007] Preferably, a monitoring chamber is provided in the middle of the gas monitoring pup joint, and an array gas sensor is provided in the monitoring chamber.

[0008] Preferably, a decompression chamber is arranged around the monitoring chamber, the outside of the decompression chamber is covered with a PDMS film, and the gas passes through the PDMS film and the decompression chamber in sequence and enters the monitoring chamber.

[0009] Preferably, activated carbon is arranged at the lower part of the monitoring chamber, a protective cover is installed outside the activated carbon, and an air hole communicating with the monitoring chamber is arranged on the top of the protective cover.

[0010] Preferably, an upper thread structure and a lower thread structure connected to the simulated drill pipe are respectively provided at the upper and lower ends of the gas monitoring nipple.

[0011] Preferably, it also includes a cooler and a pressure reducer, and the upper end of the liquid storage tank is connected to the liquid outlet at the top of the simulated wellbore through the cooler and the pressure reducer connected in sequence; an agitator is arranged inside the liquid storage tank, and a stirring motor for driving the agitator is arranged outside the liquid storage tank.

[0012] Preferably, the gas mixing chamber includes multiple straight-through pipes and multiple mixing pipes, the air inlets of the straight-through pipes are respectively connected to different gas cylinders of the gas cylinder group, the air outlets of the straight-through pipes are connected to the simulated wellbore, and a straight-through switching valve is provided at the end of each of the straight-through pipes. The multiple mixing pipes are connected in series in sequence, and a mixing switching valve is provided between adjacent mixing pipes. A mixing outlet valve is provided at the end of each mixing pipe and is connected to the simulated wellbore. The middle part of each straight pipe is connected to the mixing pipe at the head end through a mixing inlet valve, and a gas flow meter is provided at the end of each straight pipe.

[0013] Preferably, a plurality of inlaid plates are arranged in the mixing pipe to form a spiral channel.

[0014] Preferably, the gas mixing chamber comprises a first straight-through pipe, a second straight-through pipe, a third straight-through pipe, a first mixing pipe, a second mixing pipe and a third mixing pipe;

[0015] The first straight-through pipeline and the second straight-through pipeline are connected via a first mixing intake valve, the second straight-through pipeline and the third straight-through pipeline are connected via a second mixing intake valve, and the third straight-through pipeline and the head end of the first mixing pipeline are connected via a third mixing intake valve;

[0016] The end of the first mixing pipe is connected to the four-way pipe through a first mixing gas outlet valve, the end of the second mixing pipe is connected to the four-way pipe through a second mixing gas outlet valve, the end of the third mixing pipe is connected to the four-way pipe through a third mixing gas outlet valve, and the four-way pipe is connected to the simulated wellbore.

[0017] Preferably, the first mixing pipe is a straight pipe, and the second mixing pipe and the third mixing pipe are U-shaped pipes.

[0018] The present invention provides a downhole gas-liquid-solid three-phase fluid simulation detection device, comprising a simulated wellbore and a simulated drill pipe installed inside the simulated wellbore, a drill pipe motor is installed on the top of the simulated drill pipe, a support bearing is installed on the bottom of the drill pipe, the device comprises a gas cylinder group, a gas mixing chamber, a liquid storage tank, a pump group, a heater and a pressurizer, the gas cylinder group is connected to the gas inlet at the bottom of the simulated wellbore through the gas mixing chamber, the lower end of the liquid storage tank is connected to the liquid inlet at the bottom of the simulated wellbore through the pump group, the heater and the pressurizer connected in sequence, and a gas monitoring short section is installed in the middle of the simulated drill pipe.

[0019] During the working process, the gas provided by the gas cylinder group is mixed in the gas mixing chamber to simulate the type of invading gas, and the mixed gas is input into the simulated wellbore. At the same time, the solid-liquid mixing is completed in the liquid storage tank. The corresponding temperature and pressure are simulated by the heater and the pressurizer and then input into the simulated wellbore. Then, the type of the mixed gas is identified and the concentration is detected through the gas monitoring short section on the simulated drill pipe.

[0020] With high accuracy and reliability, it can realize the monitoring and analysis of multi-component gas in the well while drilling, and provide reliable experimental technical support for drilling gas invasion monitoring. The experimental device is reasonably designed, simple in structure, easy to operate and maintain, and has high safety performance, which can ensure the personal safety of the experimenters and the integrity of the equipment. The simulated wellbore and three-phase circulation device of the experimental device can realize the three-phase circulation flow of gas, liquid and solid while drilling, which can be close to the high temperature and high pressure environment in the well, and has a high ability to simulate the real downhole environment, which can better reflect the actual situation of drilling. The data receiving and processing system can realize real-time monitoring and analysis of experimental data, with a high degree of automation, simple operation, and reduced human intervention and errors. At the same time, it has a high data processing capability and can quickly and accurately draw experimental results and conclusions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a specific implementation of the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention;

[0022] Figure 2 A schematic diagram of the structure of a gas mixing chamber in a specific implementation of the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention;

[0023] Figure 3 This is a structural schematic diagram of a gas monitoring pup joint in a specific implementation manner of the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention.

[0024] Among them, 101-gas cylinder group, 102-first air inlet valve, 103-second air inlet valve, 104-third air inlet valve, 105-first air outlet valve, 106-second air outlet valve, 107-third air outlet valve, 108-fourth air outlet valve;

[0025] 200-gas mixing chamber, 201-first air inlet, 202-second air inlet, 203-third air inlet, 204-first air outlet, 205-second air outlet, 206-third air outlet, 207-first mixed air inlet valve, 208-second mixed air inlet valve, 209-third mixed air inlet valve, 210-first straight-through switch valve, 211-second straight-through switch valve, 212-third straight-through switch valve, 213-four-way pipe, 214-outlet, 215-first mixed air outlet valve, 216-second mixed air outlet valve, 217-third mixed air outlet valve, 218-first mixed air outlet valve, 219-second mixed air outlet valve, 220-first mixing pipe, 221-second mixing pipe, 222-third mixing pipe, 223-first flow meter, 224-second flow meter, 225-third flow meter, 226-fourth flow meter;

[0026] 300-gas monitoring nipple, 301-upper thread structure, 302-lower thread structure, 303-screw, 304-PDMS membrane, 305-high-strength steel wire mesh, 306-decompression chamber, 307-monitoring chamber, 308-array gas sensor, 309-protective cover, 310-activated carbon;

[0027] 401-simulated wellbore, 402-simulated drill pipe, 403-support bearing, 404-drill pipe motor, 405-heater, 406-pressurizer, 407-cooler, 408-pressure reducer, 409-stirring motor, 410-multiphase pump, 411-frequency converter, 412-first thermal insulation tube, 413-first high-temperature and high-pressure pipeline, 414-second thermal insulation tube, 415-second high-temperature and high-pressure pipeline, 416-fluid outlet, 417-stirrer, 418-liquid storage tank, 419-liquid level gauge, 420-first thermometer, 421-first pressure gauge, 422-second thermometer, 423-second pressure gauge, 424-cylinder thermometer, 425-cylinder pressure gauge, 426-high-temperature and high-pressure flowmeter;

[0028] 500-Data integrated control system. DETAILED DESCRIPTION

[0029] The core of the present invention is to provide an underground gas-liquid-solid three-phase fluid simulation detection device, which can simulate the gas-liquid-solid three-phase flow situation and realize precise control of the gas mixing ratio and flow rate, thereby improving the accuracy and practicality of gas mixing and detection.

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Please refer to Figures 1 to 3 , Figure 1 A schematic structural diagram of a specific implementation of the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention; Figure 2 A schematic diagram of the structure of a gas mixing chamber in a specific implementation of the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention; Figure 3 This is a structural schematic diagram of a gas monitoring pup joint in a specific implementation manner of the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention.

[0032] A specific embodiment of the present invention provides a downhole gas-liquid-solid three-phase fluid simulation detection device, including a simulated wellbore 401 and a simulated drill pipe 402 installed inside the simulated wellbore 401. In order to complete the movement of the simulated drill pipe 402, a drill pipe motor 404 is installed at the top of the simulated wellbore 401, and a support bearing 403 is installed at the bottom of the simulated wellbore 401. The upper end of the simulated drill pipe 402 is connected to the drill pipe motor 404, and the lower end of the drill pipe motor 404 is connected to the support bearing 403. At the same time, a cylinder thermometer 424 and a cylinder pressure gauge 425 are installed on the outer wall of the simulated wellbore 401.

[0033] It also includes a gas cylinder group 101, a gas mixing chamber 200, a liquid storage tank 418, a pump group, a heater 405 and a pressurizer 406. The gas cylinder group 101 is connected to the gas inlet at the bottom of the simulated wellbore 401 through the gas mixing chamber 200. The lower end of the liquid storage tank 418 is connected to the liquid inlet at the bottom of the simulated wellbore 401 through the pump group, the heater 405 and the pressurizer 406 connected in sequence. A gas monitoring short section 300 is installed in the middle of the simulated drill pipe 402. Further, in order to realize liquid circulation, a cooler 407 and a pressure reducer 408 are also included. The upper end of the liquid storage tank 418 is connected to the liquid outlet at the top of the simulated wellbore 401 through the cooler 407 and the pressure reducer 408 connected in sequence.

[0034] Among them, a stirrer 417 is arranged in the liquid storage tank 418, a stirring motor 409 for driving the stirrer 417 is arranged outside the liquid storage tank 418, a liquid level meter 419 is also arranged outside the liquid storage tank 418, a sewage pipe is arranged at the lower end of the liquid storage tank 418, a sewage switch valve is arranged on the sewage pipe, the lower end of the liquid storage tank 418 is also connected to a pump group through another pipeline, and a liquid outlet switch valve is arranged on the pipeline, the pump group includes a multiphase pump 410 and a frequency converter 411, and the displacement of the multiphase pump 410 can be controlled by the frequency converter 411. The heater 405 is connected to the pressurizer 406 through the first insulation pipe 412, and the pressurizer 406 is connected to the lower end of the simulated wellbore 401 through the first high-temperature and high-pressure pipeline 413, a first thermometer 420 is arranged on the heater 405, a first pressure gauge 421 is arranged on the pressurizer 406, and a high-temperature and high-pressure flowmeter 426 is arranged on the first high-temperature and high-pressure pipeline 413. The upper end of the simulated wellbore 401 is connected to the pressure reducer 408 through the second high-temperature and high-pressure pipeline 415, the pressure reducer 408 is connected to the cooler 407 through the second heat-insulated pipe 414, the cooler 407 is connected to the upper end of the liquid storage tank 418 through a pipeline, and a fluid outlet 416 is provided at the end of the pipeline, the pressure reducer 408 is provided with a second pressure gauge 423, and the cooler 407 is provided with a second thermometer 422. At the same time, each valve, each thermometer, pressure gauge and flow meter are connected to the data integrated control system 500 to obtain the detection data in real time, and control the opening and closing of each valve and the start and stop of the power equipment.

[0035] During operation, the gas provided by the gas cylinder group 101 is mixed in the gas mixing chamber 200 to simulate the type of intruding gas, and the mixed gas is input into the simulated wellbore 401. Then, the circulating drilling fluid system required for the experiment is configured as needed and put into the liquid storage tank 418. The liquid level meter 419 can monitor the liquid level in the liquid storage tank 418 in real time and transmit the data to the data integrated control system 500. Solid phase particles can also be put into the liquid storage tank 418 after calculation. After the solid phase particles are put in, the stirring motor can be turned on to drive the stirrer 417 to rotate. When the solid and liquid two-phase medium is fully mixed, the liquid inlet switch valve can be opened, the multiphase pump 410 can be turned on, and the displacement of the pump can be controlled by the frequency converter 411. When the multiphase fluid flows out from the multiphase pump 410, it will enter the heater 405 to heat the fluid medium, and the first thermometer 420 can display the temperature of the heated fluid. When the temperature of the multiphase medium fluid reaches the temperature required for the experiment, the heater 405 can transport the fluid to the pressurizer 406. The pressurizer 406 can pressurize the input fluid, and the final output pressure will be displayed on the first pressure gauge 421. When the fluid pressure reaches the required pressure, the fluid will enter the first high temperature and high pressure pipeline 413 that can withstand high temperature and high pressure, and will be input into the simulated wellbore 401 through the high temperature and high pressure flowmeter 426. After the fluid passes through the simulated wellbore 401, it will be converted into a gas-liquid-solid three-phase fluid. Then the fluid enters the pressure reducer 408 to reduce pressure. When the fluid pressure displayed on the second pressure gauge 423 reaches normal pressure, the fluid in the pressure reducer 408 can enter the cooler 407, and the temperature finally displayed on the second thermometer 422 reaches normal temperature, indicating that the temperature of the circulating fluid has been cooled, and the fluid re-enters the liquid storage tank 418 through the fluid outlet 416 to realize the circulation of the fluid. After entering the liquid storage tank 418, the fluid can release the gas introduced into the simulated wellbore 401. After the entire experiment is over, the liquid inlet switch valve can be closed and the sewage switch valve can be opened for sewage discharge. The type and concentration of the mixed gas are identified by simulating the gas monitoring nipple 300 on the drill pipe 402 .

[0036] With high accuracy and reliability, it can realize the monitoring and analysis of multi-component gas in the well while drilling, and provide reliable experimental technical support for gas invasion monitoring in drilling. The experimental device is reasonably designed, simple in structure, easy to operate and maintain, and has high safety performance, which can ensure the personal safety of the experimenters and the integrity of the equipment. The simulated wellbore 401 and three-phase circulation device of the experimental device can realize the three-phase circulation flow of gas, liquid and solid while drilling, which can be close to the high temperature and high pressure environment in the well, and has a high ability to simulate the real downhole environment, which can better reflect the actual situation of drilling. The data receiving and processing system can realize real-time monitoring and analysis of experimental data, with a high degree of automation, simple operation, and reduced manual intervention and errors. At the same time, it has a high data processing capability and can quickly and accurately draw experimental results and conclusions.

[0037] The data integrated control system 500 is divided into a control system and a data receiving and processing system. The data receiving and processing system includes components such as a data receiving module, a data processing module and a data storage module. The data receiving module is used to receive temperature, pressure and flow data from the drilling gas monitoring device and distributed in various parts of the experimental device, and transmit it to the data processing module. The data processing module adopts a multi-core processor or distributed computing technology, which can realize real-time processing and analysis of large-scale data. The data storage module adopts a high-speed solid-state hard disk or distributed storage technology, which can realize high-speed storage and management of large-scale data. The data receiving module can adopt RS232, RS485, CAN bus and other communication methods, which can be selected according to actual needs. The data processing module can adopt a multi-core processor, GPU, FPGA and other processors, or adopt distributed computing technology, and the specific implementation method can be selected according to actual needs. The data storage module can adopt a storage device such as a high-speed solid-state hard disk, SSD array, distributed storage technology, and the specific implementation method can be selected according to actual needs. The system can set a network interface to realize functions such as remote data transmission and real-time monitoring. The control system controls the valves distributed throughout the entire experimental device, and can intelligently control the switches of the valves at various locations to achieve the purpose of completing the required experiment.

[0038] In the downhole gas-liquid-solid three-phase fluid simulation detection device provided in the specific embodiment of the present invention, a monitoring chamber 307 is provided in the middle of the gas monitoring nipple 300, and an array gas sensor 308 is provided in the monitoring chamber 307. A decompression chamber 306 is provided around the monitoring chamber 307, and the outside of the decompression chamber 306 is covered with a PDMS membrane 304, and the gas enters the monitoring chamber 307 through the PDMS membrane 304 and the decompression chamber 306 in sequence. Activated carbon 310 is provided at the lower part of the monitoring chamber 307, and a protective cover 309 is installed outside the activated carbon 310, and a pore connected to the monitoring chamber 307 is provided on the top of the protective cover 309. The upper and lower ends of the gas monitoring nipple 300 are respectively provided with an upper threaded structure 301 and a lower threaded structure 302 connected to the simulated drill pipe 402.

[0039] Specifically, after the circulating fluid enters the simulated wellbore 401 and the fluid flow, temperature and pressure environment in the simulated wellbore 401 meet the expected experimental requirements, the experiment can be started. Fix the gas monitoring nipple 300 to the specified position of the simulated drill pipe 402, and both the upper threaded structure 301 and the lower threaded structure 302 should be rotated and screwed into the simulated drill pipe 402. Turn on the drill pipe motor 404 to drive the simulated drill pipe 402 to rotate, and then pass the gas into the simulated wellbore 401. The gas in the simulated wellbore 401 will enter the decompression chamber 306 through the PDMS membrane 304 covering the surface of the gas monitoring nipple 300 for decompression, and then enter the monitoring chamber 307. In the monitoring chamber 307, the array gas sensor 308 can identify the type of gas and the corresponding concentration. The outer surface of the PDMS membrane 304 is wrapped by a high-strength steel mesh 305, which is fixed by high-strength screws 303 to protect the membrane structure and reduce the impact of the fluid in the wellbore annulus. The decompression chamber 306 can use a one-way valve or a piston and other devices to control the gas pressure entering the monitoring chamber 307. The identified information will be transmitted to the data control system. The gas entering the detection chamber passes through the pores on the top of the protective cover 309, and the activated carbon 310 slowly absorbs all the penetrated gas to achieve a purification effect, making the entire monitoring sustainable.

[0040] On the basis of the underground gas-liquid-solid three-phase fluid simulation detection device provided in the above-mentioned specific embodiments, the gas mixing chamber 200 includes multiple straight-through pipes and multiple mixing pipes, the air inlets of the straight-through pipes are respectively connected to different gas cylinders of the gas cylinder group 101, the air outlets of the straight-through pipes are connected to the simulated wellbore 401, and a straight-through switch valve is provided at the end of each straight-through pipe, multiple mixing pipes are connected in series in sequence, a mixing switch valve is provided between adjacent mixing pipes, a mixed outlet valve is provided at the end of each mixing pipe and connected to the simulated wellbore 401, and the middle of each straight-through pipe is connected to the mixing pipe at the head end through a mixed air inlet valve. Among them, the mixing pipe is usually made of materials such as stainless steel or high-temperature alloy, and multiple inlaid plates are provided inside to form a spiral channel to increase the friction between the gas and the vortex to achieve a mixing effect.

[0041] Specifically, the gas mixing chamber 200 includes a first straight pipeline, a second straight pipeline, a third straight pipeline, a first mixing pipeline 220, a second mixing pipeline 221 and a third mixing pipeline 222. Correspondingly, three gas cylinders are set. The first gas cylinder is connected to the first air inlet 201 of the first straight pipeline through the first air inlet valve 102, the first air outlet 204 of the first straight pipeline is connected to the simulated wellbore 401 through the first air outlet valve 105, the second gas cylinder is connected to the second air inlet 202 of the second straight pipeline through the second air inlet valve 103, the second air outlet 205 of the second straight pipeline is connected to the simulated wellbore 401 through the second air outlet valve 106, the third gas cylinder is connected to the third air inlet 203 of the third straight pipeline through the third air inlet valve 104, and the third air outlet 206 of the third straight pipeline is connected to the simulated wellbore 401 through the third air outlet valve 107. At the same time, a first flowmeter 223, a second flowmeter 224 and a third flowmeter 225 are respectively arranged near the outlet gas ports. A first direct switch valve 210 is disposed at the end of the first direct pipeline, a second direct switch valve 211 is disposed at the end of the second direct pipeline, and a third direct switch valve 212 is disposed at the end of the third direct pipeline.

[0042] At the same time, the three straight pipes are all connected. The first straight pipe and the second straight pipe are connected through the first mixing intake valve 207, and the second straight pipe and the third straight pipe are connected through the second mixing intake valve 208, thereby realizing the connection of the three straight pipes. The third straight pipe and the head end of the first mixing pipe 220 are connected through the third mixing intake valve 209.

[0043] A four-way pipe 213 is also provided, the end of the first mixing pipe 220 is connected to the first inlet of the four-way pipe 213 through the first mixing outlet valve 215, the end of the second mixing pipe 221 is connected to the second inlet of the four-way pipe 213 through the second mixing outlet valve 216, the end of the third mixing pipe 222 is connected to the third inlet of the four-way pipe 213 through the third mixing outlet valve 217, and the outlet 214 of the four-way pipe 213 is provided with a fourth flow meter 226 and connected to the simulated wellbore 401 through the fourth outlet valve 108. And the end of the first mixing pipe 220 is connected to the head end of the second mixing pipe 221 through the first mixing switch valve 218, and the end of the second mixing pipe 221 is connected to the head end of the third mixing pipe 222 through the second mixing switch valve 219. Preferably, for reasonable layout, the first mixing pipe 220 is a straight pipe, and the second mixing pipe 221 and the third mixing pipe 222 are U-shaped pipes. Of course, the number and arrangement of each component can also be adjusted according to the situation, all within the protection scope of the present invention.

[0044] During the working process, you first need to prepare the gas cylinder group 101. The type of gas should be the type of simulated intrusion gas required for the experiment. Before the experiment begins, the gas pipelines on the side of the first outlet valve 105, the second outlet valve 106 and the third outlet valve 107 close to the gas mixing chamber 200 should be removed to prevent the gas from entering the simulated wellbore 401 while ensuring that the gas pipeline is unobstructed for adjusting the determined gas ratio. Open the first inlet valve 102, the second inlet valve 103 and the third inlet valve 104 to pass the simulated intrusion gas into the gas mixing chamber 200. The gas will enter from the first inlet 201, the second inlet 202 and the third inlet 203. At this time, the appropriate valve opening should be adjusted to control the outflow of gas.

[0045] If a mixed gas is not needed and only pure gas is needed, the first mixed air intake valve 207, the second mixed air intake valve 208 and the third mixed air intake valve 209 can be closed, and the first straight-through switch valve 210, the second straight-through switch valve 211 and the third straight-through switch valve 212 can be opened, and the gas will flow out of the gas mixing chamber 200 from the first gas outlet 204, the second gas outlet 205 and the third gas outlet 206 respectively. The first flow meter 223, the second flow meter 224 and the third flow meter 225 can monitor the gas flow of the corresponding pipeline in real time, and the gas flow of the corresponding pipeline can be adjusted by controlling the opening of the first straight-through switch valve 210, the second straight-through switch valve 211 and the third straight-through switch valve 212.

[0046] If a mixed gas is needed, the first direct switch valve 210, the second direct switch valve 211 and the third direct switch valve 212 should be closed, and the first mixing intake valve 207, the second mixing intake valve 208 and the third mixing intake valve 209 should be opened. The gas will first enter the first mixing pipe 220 along the pipeline to achieve gas mixing.

[0047] If the required degree of gas mixing is not large, the first mixing switch valve 218, the second mixing outlet valve 216 and the third mixing outlet valve 217 can be closed, and the first mixing outlet valve 215 can be opened. The gas will enter the four-way pipe 213, and the gas flow rate is monitored by the fourth flow meter 226. At this time, the flow rate of the mixed gas can be adjusted by adjusting the opening of the first mixing outlet valve 215, and discharged through the outlet 214 of the four-way pipe 213.

[0048] If the mixing degree of the required mixed gas is increased, then after the gas flows through the first mixing pipe 220, the first mixed gas outlet valve 215, the second mixed on-off valve 219, and the third mixed gas outlet valve 217 should be closed, and the first mixed on-off valve 218 and the second mixed gas outlet valve 216 should be opened. Similarly, adjusting the opening of the second mixed gas outlet valve 216 can also achieve the purpose of controlling the flow rate of the mixed gas. At this time, the mixed gas flows through the first mixing pipe 220 and the second mixing pipe 221, and the mixing degree is more sufficient.

[0049] If the required mixing degree of the mixed gas needs to be maximized, the first mixed gas outlet valve 215 and the second mixed gas outlet valve 216 are closed when the mixed gas flows through the first mixing pipeline 220, and the first mixing switch valve 218, the second mixing switch valve 219, and the third mixed gas outlet valve 217 are opened. Then, the gas will enter the four-way pipe 213 after flowing through the first mixing pipeline 220, the second mixing pipeline 221, and the third mixing pipeline 222. The flow rate of the gas can be controlled by adjusting the opening of the third mixed gas outlet valve 217. The gas after passing through the mixing pipeline will flow out of the gas mixing chamber 200200 from the outlet. After the required gas is configured, the first intake valve 102, the second intake valve 103, and the third intake valve 104 should be closed, and the pipeline should be reconnected back to the experimental device.

[0050] The specific working process is:

[0051] 1. Installation

[0052] 1.1 Place the entire experimental device on a fixed and stable ground, and connect the power supply and pipelines, etc.

[0053] 1.2 Install the gas intrusion monitoring device while drilling, fix the gas monitoring short section 300 on the simulated drill pipe 402, and connect the cable interface to the data receiving and processing system.

[0054] 1.3 Install the gas collection system to a suitable sampling point, turn on the sampling system, and keep the air circulating for a few minutes to remove contaminants in the pipeline.

[0055] 2. Preparation

[0056] 2.1 Prepare gas samples, put various possible formation invasion gases into their own pure gas cylinders, and then pass them to the gas mixing chamber 200. Note: Place the gas cylinders on a stable ground to prevent the bottles from tipping over.

[0057] 2.2 Open the gas mixing chamber 200, control the opening and closing of the relevant valves in the mixing chamber, and adjust the mixing ratio by the number of connected mixing pipes to achieve the range required by the experiment.

[0058] 2.3 Pass the gas sample into the mixing chamber. The flow rate can be controlled by relevant valves to keep the gas flow in the mixing chamber stable.

[0059] 2.4 Start the wellbore circulation system, set the temperature and pressure of the fluid in the simulated wellbore 401, and ensure that the fluid is in a stable state.

[0060] 2.5 The gas in the gas mixing chamber 200 is introduced into the wellbore, and the gas monitoring sub 300 is connected to the data integrated control system 500.

[0061] 3. Experimental Operation

[0062] 3.1 By controlling the wellbore circulation system, the gas flows from the bottom of the simulated wellbore 401 to the top of the simulated wellbore 401, and the stable state of the fluid in the simulated wellbore 401 is maintained.

[0063] 3.2 Ensure that the gas sample can fully enter the detection chamber by adjusting the rotation speed of the gas monitoring nipple 300.

[0064] 3.3 The data receiving and processing system receives and processes the data of gas samples in real time and displays the data on the computer for analysis and research.

[0065] 3.4 During the experiment, the gas flow rate, mixing ratio and other parameters in the gas mixing chamber 200 can be adjusted to control the changes in gas composition and concentration, thereby simulating the invasion of gas in different formations.

[0066] 4. End of the experiment

[0067] 4.1 Shut down the gas mixing chamber 200, the wellbore circulation system, the gas monitoring nipple 300 and other equipment, and stop collecting gas samples.

[0068] 4.2 Close the data receiving and processing system and save the experimental data.

[0069] 4.3 Shut down the gas collection system and clean up the residual gas in the gas sampling points and pipelines.

[0070] 4.4 Turn off the power of the entire experimental device and carry out cleaning and maintenance. For each device, it should be cleaned and maintained according to its instruction manual to ensure its normal operation and long-term use.

[0071] Note:

[0072] 1. Before operating the experimental device, you must carefully read the equipment manual and use and operate it correctly according to the manual.

[0073] 2. During the gas collection and mixing process, air circulation must be maintained to ensure the purity and stability of the gas.

[0074] 3. During the experiment, you must strictly abide by the experimental safety regulations and pay attention to prevent accidents such as fire and explosion.

[0075] 4. After the experiment, the equipment must be cleaned and maintained according to the equipment manual to ensure the normal operation and long-term use of the equipment.

[0076] The above is a detailed introduction to the downhole gas-liquid-solid three-phase fluid simulation detection device provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A downhole gas-liquid-solid three-phase fluid simulation detection device, comprising a simulated wellbore (401) and a simulated drill pipe (402) installed inside the simulated wellbore (401), a drill pipe motor (404) is installed on the top of the simulated drill pipe (402), and a support bearing (403) is installed on the bottom of the drill pipe, characterized in that: The invention comprises a gas cylinder group (101), a gas mixing chamber (200), a liquid storage tank (418), a pump group, a heater (405) and a pressurizer (406); the gas cylinder group (101) is connected to the gas inlet at the bottom of the simulated wellbore (401) through the gas mixing chamber (200); the lower end of the liquid storage tank (418) is connected to the liquid inlet at the bottom of the simulated wellbore (401) through the pump group, the heater (405) and the pressurizer (406) connected in sequence; and a gas monitoring short section (300) is installed in the middle of the simulated drill pipe (402).

2. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 1, characterized in that: A monitoring chamber (307) is arranged in the middle of the gas monitoring nipple (300), and an array gas sensor (308) is arranged in the monitoring chamber (307).

3. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 2 is characterized in that: A decompression chamber (306) is arranged around the monitoring chamber (307), and the outside of the decompression chamber (306) is covered with a PDMS film (304). Gas passes through the PDMS film (304) and the decompression chamber (306) in sequence and enters the monitoring chamber (307).

4. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 3, characterized in that: Activated carbon (310) is arranged at the lower part of the monitoring chamber (307), a protective cover (309) is installed outside the activated carbon (310), and an air hole communicating with the monitoring chamber (307) is arranged at the top of the protective cover (309).

5. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 4, characterized in that: An upper thread structure (301) and a lower thread structure (302) connected to the simulated drill pipe (402) are respectively provided at the upper and lower ends of the gas monitoring nipple (300).

6. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 1, characterized in that: It also includes a cooler (407) and a pressure reducer (408), and the upper end of the liquid storage tank (418) is connected to the liquid outlet at the top of the simulated wellbore (401) through the cooler (407) and the pressure reducer (408) connected in sequence; an agitator (417) is arranged inside the liquid storage tank (418), and a stirring motor (409) for driving the agitator (417) is arranged outside the liquid storage tank (418).

7. The downhole gas-liquid-solid three-phase fluid simulation detection device according to any one of claims 1 to 5, characterized in that: The gas mixing chamber (200) comprises a plurality of straight-through pipes and a plurality of mixing pipes, wherein the air inlets of the straight-through pipes are respectively connected to different gas cylinders of the gas cylinder group (101), and the air outlets of the straight-through pipes are connected to the simulated wellbore (401), and a straight-through switch valve is arranged at the end of each of the straight-through pipes. The plurality of mixing pipes are connected in series in sequence, and a mixing switch valve is arranged between adjacent mixing pipes. A mixing outlet valve is arranged at the end of each of the mixing pipes and is connected to the simulated wellbore (401), and the middle of each of the straight-through pipes is connected to the mixing pipe at the head end via a mixing air inlet valve, and a gas flow meter is arranged at the end of each of the straight-through pipes.

8. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 7, characterized in that: A plurality of inlaid plates are arranged in the mixing pipe to form a spiral channel.

9. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 8, characterized in that: The gas mixing chamber (200) comprises a first straight pipeline, a second straight pipeline, a third straight pipeline, a first mixing pipeline (220), a second mixing pipeline (221) and a third mixing pipeline (222); The first straight-through pipeline and the second straight-through pipeline are connected via a first mixing intake valve (207), the second straight-through pipeline and the third straight-through pipeline are connected via a second mixing intake valve (208), and the third straight-through pipeline and the head end of the first mixing pipeline (220) are connected via a third mixing intake valve (209); The end of the first mixing pipe (220) is connected to the four-way pipe (213) via a first mixing gas outlet valve (215), the end of the second mixing pipe (221) is connected to the four-way pipe (213) via a second mixing gas outlet valve (216), the end of the third mixing pipe (222) is connected to the four-way pipe (213) via a third mixing gas outlet valve (217), and the four-way pipe (213) is connected to the simulated wellbore (401).

10. The downhole gas-liquid-solid three-phase fluid simulation detection device according to claim 9, characterized in that: The first mixing pipe (220) is a straight pipe, and the second mixing pipe (221) and the third mixing pipe (222) are U-shaped pipes.

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