Horizontal well drilling wellbore temperature control evaluation experimental device and method

Abstract

The application provides a horizontal well drilling wellbore temperature control evaluation experiment device, which comprises an outer pipe for simulating a wellbore, a heater arranged on the outer wall of the outer pipe for heating the outer pipe to simulate a formation, an inner pipe in the form of a gap arranged in the inner part of the outer pipe for simulating a drill rod, a first motor connected with the inner pipe for driving the inner pipe to rotate to simulate the rotation of the drill rod, a hot water circulating pump connected with the liquid inlet of the inner pipe for injecting fluid into the inner pipe to simulate drilling fluid when the drill rod is working, a preheating mechanism arranged upstream of the hot water circulating pump, and a cooling mechanism arranged upstream of the preheating mechanism for adjusting the temperature of the fluid, wherein the upstream of the cooling mechanism is connected with the liquid outlet of the outer pipe. The outer pipe is arranged to simulate the wellbore, the inner pipe is arranged to simulate the drill rod, the heater is arranged to simulate the heating of the wellbore by the formation, and the hot water circulating pump is arranged to pump fluid into the drill rod to simulate the drilling fluid, so that the temperature environment when working underground can be intuitively simulated, and the operation is convenient.

Description

Technical Field

[0001] This invention belongs to the field of petroleum drilling technology, specifically relating to an experimental device for evaluating the temperature control of a horizontal wellbore and an experimental method for evaluating the temperature control of a horizontal wellbore. Background Technology

[0002] During the construction of oil and gas wells, the temperature of the wellbore increases with depth due to the geothermal gradient. Field data shows that high temperatures prevent drilling tools from fully meeting drilling requirements. In high-temperature environments, the stability and lifespan of drill bits, downhole power tools, measurement-while-drilling (MWD) systems, and drilling fluids are significantly affected. For example, high temperatures cause the rubber seals of roller cone bits, percussion bits, and downhole power tools to fail, limiting the use of downhole power tools, increasing the frequency of drill bit replacements, and raising drilling costs. The accuracy and reliability of the MWD system are reduced due to high temperatures, making it difficult to effectively control the wellbore trajectory. High temperatures also cause significant changes in the density, rheology, and stability of the drilling fluid, leading to thickening, gelling, or solidification, greatly reducing its wall protection and rock-carrying capabilities, and increasing the risk of downhole accidents.

[0003] To ensure safe drilling operations, measures need to be taken to reduce the ambient temperature of the wellbore during the drilling process, providing room for the development of drilling equipment and measurement-while-drilling (MWD) systems. Currently, wellbore ambient temperature can be reduced from several aspects, including process and tooling, such as lowering the inlet temperature, increasing circulation time, and using insulated tools (insulated drill pipe, insulated casing, etc.). However, currently, verifying the effectiveness of wellbore temperature control methods can only be done through field trials, which are costly. Furthermore, the experimental results of cooling measures may differ significantly from expectations. If cooling measures fail to achieve satisfactory results, the downhole temperature may exceed the rated temperature of the MWD system, making it difficult to control the wellbore trajectory, causing drilling shutdowns, and resulting in high maintenance costs. Summary of the Invention

[0004] To address the technical problems mentioned above, this invention aims to provide an experimental device for evaluating the temperature control of horizontal well drilling shafts. This device can accurately and objectively simulate the temperature environment during downhole operations in drilling, providing a basis for experiments on cooling measures and saving costs.

[0005] This invention also proposes an experimental method for evaluating the temperature control of horizontal wellbore drilling, which can intuitively and quickly reflect the effect of cooling measures.

[0006] According to the present invention, a horizontal wellbore temperature control evaluation experimental device is provided, comprising: an outer tube having a liquid outlet, the outer tube simulating a wellbore; a heater disposed on the outer wall of the outer tube, the heater simulating formation heating of the outer tube; an inner tube intermittently sleeved inside the outer tube, the inner tube having a liquid inlet, the inner tube simulating drill pipe; a first motor connected to the inner tube, the first motor driving the inner tube to rotate, simulating drill pipe rotation; a hot water circulation pump connected to the liquid inlet of the inner tube, the hot water circulation pump injecting fluid into the inner tube, simulating drilling fluid; a preheating mechanism disposed upstream of the hot water circulation pump; and a cooling mechanism disposed upstream of the preheating mechanism, the preheating mechanism and the cooling mechanism cooperating to regulate the temperature of the fluid; wherein the upstream of the cooling mechanism is connected to the liquid outlet of the outer tube.

[0007] In one embodiment, the inner tube includes a vertical tube, a horizontal tube, and a conversion joint, wherein both the vertical tube and the horizontal tube are rotatably and sealed to the conversion joint.

[0008] In one embodiment, the first motor is connected to the vertical pipe and is used to drive the vertical pipe to rotate. A second motor is provided at the end of the horizontal pipe away from the vertical pipe and is used to drive the horizontal pipe to rotate.

[0009] In one embodiment, there are multiple heaters evenly spaced along the outer wall of the outer tube, wherein each heater is connected to a frequency modulator for adjusting the temperature of the heater to simulate the formation temperature gradient.

[0010] In one embodiment, a first pressure sensor and a first temperature sensor are provided at the liquid inlet of the inner tube, and a second pressure sensor and a second temperature sensor are provided at the liquid outlet of the outer tube; at least one first thermocouple is provided on the outer wall of the outer tube, at least one second thermocouple is provided between the outer tube and the inner tube, at least one third thermocouple is provided inside the inner tube, and a high-temperature insulating cloth for insulating the temperature of the heater is provided outside the first thermocouple.

[0011] In one embodiment, an eccentric flange is provided between the inner tube and the outer tube, the eccentric flange being used to adjust the degree of eccentricity of the inner tube relative to the outer tube.

[0012] In one embodiment, an air intake mechanism is provided upstream of the hot water circulation pump. The air intake mechanism is used to inject gas into the fluid to simulate the working conditions during gas intrusion during drilling. A gas-liquid two-phase flow meter is connected in series between the hot water circulation pump and the liquid inlet of the inner pipe.

[0013] In one embodiment, the preheating mechanism includes a preheating water tank, a liquid flow controller, a gas flow meter, and a liquid flow meter connected in series from upstream to downstream. A first valve is connected in series between the preheating water tank and the cooling mechanism, and a second valve is connected in series between the preheating water tank and the liquid flow controller. A preheating temperature sensor for measuring fluid temperature is also installed on the preheating water tank, and an automatic vent valve is also installed on the preheating water tank to discharge the gas injected by the air intake mechanism. The cooling mechanism includes a cooler, a cold water circulation pump, a cold water tank, and a cooling tower. The cooler includes an inner shell and an outer shell. One end of the inner shell is connected to the liquid outlet of the outer pipe, and the other end of the inner shell is connected to the first valve. The outer shell is connected in series with the cooling tower, the cold water tank, and the cold water circulation pump. The air intake mechanism includes an air compressor, a gas cylinder, a gas flow controller, and a third valve connected in series, wherein the third valve is connected upstream of the hot water circulation pump.

[0014] In one embodiment, the horizontal well drilling wellbore temperature control evaluation experimental device further includes a computer, which is electrically connected to the preheating temperature sensor, the liquid flow controller, the liquid flow meter, the gas flow controller, the gas flow meter, the gas-liquid two-phase flow meter, the first pressure sensor, the second pressure sensor, the first temperature sensor, the second temperature sensor, the first thermocouple, the second thermocouple, the third thermocouple, and the frequency tuner.

[0015] According to the present invention, a method for evaluating the temperature control of a horizontal wellbore is also provided, using the experimental apparatus for evaluating the temperature control of a horizontal wellbore described in the present invention, comprising the following steps: The original experiment was conducted without using cooling processes or heat insulation tools; Comparative experiments were conducted using cooling techniques or heat insulation tools; The data from the two sets of experiments were compared and evaluated.

[0016] Compared with the prior art, the advantages of this application are as follows.

[0017] This invention simulates the temperature environment during downhole operations by setting an outer pipe to simulate the wellbore, an inner pipe to simulate the drill pipe, a heater to simulate the formation heating the wellbore, and a hot water circulation pump to pump fluid into the drill pipe to simulate drilling fluid. It can intuitively simulate the temperature environment during downhole operations and is easy to operate.

[0018] Meanwhile, the experimental method provided by this invention can accurately and objectively demonstrate whether the cooling measures are effective. It is simple to operate and can quickly obtain experimental results, which is of great significance for ensuring safe operation at the drilling site. Attached Figure Description

[0019] The present invention will now be described with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of an embodiment of the experimental apparatus for evaluating the temperature control of horizontal well drilling shafts according to the present invention is shown. Figure 2 A schematic diagram showing an embodiment of the outer tube and inner tube according to the present invention is provided. Figure 3 A schematic diagram of an embodiment of the inner tube according to the present invention is shown; Figure 4 A partial schematic diagram of the inner tube according to the present invention is shown; Figure 5 A schematic diagram showing the distribution of thermocouples according to the present invention is displayed.

[0021] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0022] The invention will now be described with reference to the accompanying drawings.

[0023] In this application, it should be noted that the direction of the fluid according to the present invention is described as "upstream", "front end" or similar terms, while the direction of the fluid is described as "downstream", "back end" or similar terms.

[0024] Figure 1 The structure of the experimental apparatus 100 for evaluating the temperature control of horizontal wellbore drilling according to the present invention is shown. Figure 1 As shown, the horizontal well drilling wellbore temperature control evaluation experimental device 100 includes an outer pipe 211, an inner pipe 212, a heater 22, a first motor 17, a hot water circulation pump 13, a preheating mechanism 40, and a cooling mechanism 50. According to the present invention, a fluid inlet is provided at the upper end of the inner pipe 212 for injecting fluid into the inner pipe 212. The fluid is equivalent to drilling fluid, and the inner pipe 212 is equivalent to the drill pipe, thus simulating the process of drilling fluid entering the drill string.

[0025] The outer tube 211 is intermittently sleeved outside the inner tube 212. The bottom of the outer tube 211 is sealed, and a fluid outlet is provided at the upper end of the outer tube 211. With this configuration, the outer tube 211 simulates a wellbore. Fluid injected into the inner tube 212 reaches the bottom of the inner tube 212 and flows upward through the annular space between the outer tube 211 and the inner tube 212, finally exiting through the fluid outlet. This objectively simulates the working conditions during drilling operations.

[0026] Heater 22 is disposed on the outer wall of outer tube 211. In this embodiment, heater 22 is annular and sleeved on the outside of outer tube 211. The annular heater 22 can heat outer tube 211 more evenly. Furthermore, multiple heaters 22 are disposed evenly along outer tube. Because there are temperature gradient differences in the formation, by disposing of multiple heaters 22 and controlling the temperature of different heaters 22, the heating of outer tube 211 by the formation can be simulated more realistically.

[0027] In a preferred embodiment, each heater 22 is connected to a frequency modulator 23. The temperature of the heater 22 can be controlled by the frequency modulator 23.

[0028] In a preferred embodiment, such as Figure 3 As shown, the inner pipe 212 includes a vertical pipe 217, a horizontal pipe 218, and a conversion joint 214. Both the vertical pipe 217 and the horizontal pipe 218 are rotatably connected to the conversion joint 214 in a sealed manner. With this configuration, the present invention can be used not only to simulate vertical wells but also to simulate horizontal wells.

[0029] According to the present invention, the first motor 17 is located directly above the vertical tube 217. In a specific embodiment, an experimental support frame 18 for manufacturing the first motor 17 is provided on the first motor 17. The output shaft of the first motor 17 is connected to the vertical tube 217. Thus, the first motor 17 can drive the vertical tube 217 to rotate, thereby simulating the rotation of a drill rod. A second motor 26 is provided at the end of the horizontal tube 218 away from the vertical tube, and the output shaft of the second motor 26 is connected to the horizontal tube 218 to drive the horizontal tube to rotate.

[0030] According to the present invention, the cooling mechanism 50, the preheating mechanism 40, and the hot water circulation pump 13 are connected in series, with the upstream of the cooling mechanism 50 connected to the outlet of the outer pipe 211 and the downstream of the hot water circulation pump 13 connected to the inlet of the inner pipe 212. With this arrangement, after the fluid is heated through the inner pipe 212 and the outer pipe 211, its temperature can be adjusted by the cooling mechanism 50 and the preheating mechanism 40, thus allowing for recycling and saving materials.

[0031] In a preferred embodiment, an air intake mechanism 60 is also provided upstream of the hot water circulation pump 13. The air intake mechanism 60 is a separate pipeline used to inject gas into the fluid, thereby simulating the gas intrusion process that occurs during actual drilling operations. In this embodiment, the preheating mechanism 40 includes an automatic exhaust valve 2. The gas injected into the fluid is discharged by setting the automatic exhaust valve 2.

[0032] In one specific embodiment, the preheating mechanism 40 includes a preheating water tank 3, a liquid flow controller 6, and a liquid flow meter 7 connected in series from upstream to downstream. A first valve 1 is connected in series between the preheating water tank 3 and the cooling mechanism 50. A second valve is connected in series between the preheating water tank 3 and the liquid flow controller 6. A preheating temperature sensor 4 for measuring the fluid temperature is also installed on the preheating water tank 3. An automatic vent valve 2 is installed on the preheating water tank 3. By installing the liquid flow controller 6 and the liquid flow meter 7, the flow rate of the fluid can be controlled, and by installing the preheating temperature sensor 4, the initial temperature of the fluid can be controlled. These settings allow for precise control of relevant experimental factors during comparative experiments.

[0033] In one specific embodiment, the cooling mechanism 50 includes a cooler 27, a cold water circulation pump 28, a cold water tank 29, and a cooling tower 30. The cooler 27 includes an inner shell and an outer shell. One end of the inner shell is connected to the outlet of the outer pipe 211, and the other end is connected to a first valve 1 for fluid passage. The outer shell is connected in series with the cooling tower 30, the cold water tank 29, and the cold water circulation pump 28 for cooling water passage. Furthermore, the flow direction of the cooling water is opposite to the flow direction of the fluid, which is countercurrent cooling. That is, after the cooling water exchanges heat with the fluid, it flows through the cooling tower 30 for cooling and then flows back to the cold water tank 29. This maximizes the cooling effect.

[0034] In one specific embodiment, the air intake mechanism 60 includes an air compressor 8, a gas cylinder 9, a gas flow controller 10, a gas flow meter 11, and a third valve 12 connected in series, wherein the third valve 12 is connected upstream of the hot water circulation pump 13. The air compressor 8 compresses air into the gas cylinder 9, and then the gas cylinder 9 injects the gas into the fluid at a constant flow rate after passing through the gas flow controller 10 and the gas flow meter 11.

[0035] In a preferred embodiment, a first pressure sensor 19 and a first temperature sensor 16 are installed at the inlet of the inner tube 212, and a second pressure sensor 25 and a second temperature sensor 24 are installed at the outlet of the outer tube 211. The pressure drop of the fluid after flowing through the inner and outer tubes is calculated by measuring the difference in readings of the first pressure sensor 19 and the second pressure sensor 25. This pressure difference wave is used to confirm the flow regime of the fluid, and the effectiveness of the cooling measures can be analyzed based on the flow regime. The first temperature sensor 16 and the second temperature sensor 24 measure the temperature difference between the inlet and outlet, providing a direct indication of the effectiveness of the cooling measures.

[0036] In a preferred embodiment, such as Figure 5As shown, at least one first thermocouple 20 is installed on the outer wall of the outer tube 211 to measure the temperature of the tube wall. At least one second thermocouple 202 is installed between the outer tube 211 and the inner tube 212, and the second thermocouple 202 is immersed in the fluid to measure the temperature of the fluid between the outer tube 211 and the inner tube 212. At least one third thermocouple 203 is installed inside the inner tube 212, and the third thermocouple 203 is immersed in the fluid to measure the temperature of the fluid inside the inner tube 212. To accurately measure the temperature of the outer tube 211, a high-temperature insulating cloth is installed outside the first thermocouple 201. The high-temperature insulating cloth isolates the heater 22 from the first thermocouple 201. These thermocouples are uniformly arranged along the axial direction of the inner tube 212 or the outer tube 211, thereby accurately reflecting the temperature changes during fluid flow.

[0037] According to a preferred embodiment of the present invention, such as Figure 2 and Figure 4 As shown, both the inner tube 212 and the outer tube 211 are standard parts, meaning they are composed of multiple standard sections connected by threads. Flange holes are provided on the walls of these standard parts, through which an eccentric flange is installed between the inner tube 212 and the outer tube 211. The degree of eccentricity of the inner tube 212 relative to the outer tube 211 can be adjusted by adjusting the eccentric flange, thereby simulating various drilling conditions.

[0038] In a preferred embodiment, a gas-liquid two-phase flow meter 14 is connected in series between the hot water circulation pump 13 and the liquid inlet of the inner pipe 212. This arrangement allows for more precise control of relevant experimental variables.

[0039] According to a preferred embodiment of the present invention, the horizontal wellbore temperature control evaluation experimental device 100 further includes a computer 15, which is electrically connected to a preheating temperature sensor 4, a liquid flow controller 6, a liquid flow meter 7, a gas flow controller 10, a gas flow meter 11, a gas-liquid two-phase flow meter 14, a first pressure sensor 19, a second pressure sensor 25, a first temperature sensor 16, a second temperature sensor 24, a first thermocouple 201, a second thermocouple 202, a third thermocouple 203, and a frequency modulator 25. With this configuration, the computer can process and store the data from the aforementioned instruments through a data acquisition system. In a preferred embodiment, the data from the aforementioned instruments is transmitted wirelessly.

[0040] In one embodiment of the present invention, a method for evaluating the temperature control of a horizontal wellbore is provided. This method uses a horizontal wellbore temperature control evaluation experimental apparatus 100 and includes the following steps: (a) Conducting the original experiment: Without using cooling technology or heat insulation tools, the experiment is conducted by adjusting the temperature of the preheating water tank 3 to control the inlet temperature, adjusting the gas flow controller 10 to control the gas flow, adjusting the liquid flow controller 6 to control the liquid flow, adjusting the motor speed, and adjusting the eccentricity of the eccentric flange, etc., to simulate the drilling process. After the experimental system is running stably, the temperatures of the inlet and outlet, the readings of the first thermocouple 201, the second thermocouple 202, the third thermocouple 203, the first pressure sensor 19, the second pressure sensor 25, and the liquid flow meter 7 are recorded. (II) Evaluation Experiment: A cooling process was adopted. The experiment simulated a drilling process by adjusting parameters such as the inlet temperature of the preheating water tank 3, the gas flow rate of the gas flow controller 10, the liquid flow rate of the liquid flow controller 6, the motor speed, and the eccentricity of the eccentric flange. Once the experimental system was running stably, the temperatures at the inlet and outlet, and the readings of the first thermocouple 201, the second thermocouple 202, the third thermocouple 203, the first pressure sensor 19, the second pressure sensor 25, and the liquid flow meter 7 were recorded. This allowed for the evaluation of the impact of process parameters such as controlling the inlet temperature and the circulating flow rate on the temperature control effect. Using insulation tools: Replace the standard parts that make up the inner tube 212 with standard parts made of insulation material. The position and length of the insulation material can be set as needed, and the impact of different insulation materials and insulation material lengths on the temperature control effect can be evaluated.

[0041] (III) Comparison: Compare the temperatures of the inlet and outlet of different cooling measures, the outer wall temperature of the outer tube 211, the fluid temperature in the annulus between the outer tube 211 and the inner tube 212, and the fluid temperature in the inner tube 212 to evaluate the effectiveness of different drilling wellbore temperature control methods.

[0042] This invention simulates the temperature environment and drilling conditions during downhole operations by setting an outer pipe 211 to simulate the wellbore, setting an inner pipe 212 to simulate the drill pipe, setting multiple heaters to simulate the formation heating the wellbore, and setting a hot water circulation pump to pump fluid into the drill pipe to simulate drilling fluid.

[0043] Meanwhile, the experimental method provided by this invention can accurately and objectively demonstrate whether the cooling measures are effective. It is simple to operate and can quickly obtain experimental results, which is of great significance for ensuring safe operation at the drilling site.

[0044] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An experimental device for evaluating the temperature control of a horizontal wellbore, characterized in that, include: An outer tube (211) is provided with a liquid outlet, and the outer tube (211) is used to simulate a wellbore; A heater (22) is installed on the outer wall of the outer tube (211). The heater (22) is used to simulate the formation heating the outer tube (211). A plurality of heaters (22) are evenly spaced along the outer wall of the outer tube (211). A frequency modulator (23) is connected to each heater (22). The frequency modulator is used to adjust the temperature of the heater (22) to simulate the formation temperature gradient. An inner tube (212) is intermittently fitted inside the outer tube (211). An inlet is provided on the inner tube (212). The inner tube (212) is used to simulate a drill pipe. The inner tube (212) includes a vertical tube, a horizontal tube, and a conversion joint. The vertical tube and the horizontal tube are both rotatably and sealed to the conversion joint. A first motor (17) is connected to the inner tube (212), and the first motor (17) is used to drive the inner tube (212) to rotate, simulating the rotation of the drill rod. The first motor (17) is connected to the vertical tube, and the first motor (17) is used to drive the vertical tube to rotate. A second motor (26) is provided at the end of the horizontal tube away from the vertical tube, and the second motor (26) is used to drive the horizontal tube to rotate. A first pressure sensor (19) and a first temperature sensor (16) are provided at the inlet of the inner tube (212), a second pressure sensor (25) and a second temperature sensor (24) are provided at the outlet of the outer tube (211), at least one first thermocouple is provided on the outer wall of the outer tube (211), at least one second thermocouple is provided between the outer tube (211) and the inner tube (212), at least one third thermocouple is provided inside the inner tube (212), and a high-temperature insulating cloth for isolating the temperature of the heater (22) is provided on the outside of the first thermocouple; A hot water circulation pump (13) is connected to the inlet of the inner tube (212), the hot water circulation pump (13) is used to inject fluid into the inner tube (212) to simulate drilling fluid; A preheating mechanism (40) is installed upstream of the hot water circulation pump (13); And a cooling mechanism (50) disposed upstream of the preheating mechanism (40), the preheating mechanism (40) and the cooling mechanism (50) cooperate with each other to regulate the temperature of the fluid; The upstream of the cooling mechanism (50) is connected to the liquid outlet of the outer pipe (211).

2. The experimental apparatus for evaluating the temperature control of horizontal well drilling shafts according to claim 1, characterized in that, An eccentric flange is provided between the inner tube (212) and the outer tube (211), and the eccentric flange is used to adjust the degree of eccentricity of the inner tube (212) relative to the outer tube (211).

3. The experimental apparatus for evaluating the temperature control of horizontal well drilling shafts according to claim 2, characterized in that, An air intake mechanism (60) is also provided upstream of the hot water circulation pump (13). The air intake mechanism (60) is used to inject gas into the fluid to simulate the working condition of gas invasion during drilling. A gas-liquid two-phase flow meter (14) is connected in series between the hot water circulation pump (13) and the liquid inlet of the inner pipe (212).

4. The experimental apparatus for evaluating the temperature control of horizontal well drilling shafts according to claim 3, characterized in that, The preheating mechanism (40) includes a preheating water tank (3), a liquid flow controller (6) and a liquid flow meter (7) connected in series from upstream to downstream. A first valve (1) is connected in series between the preheating water tank (3) and the cooling mechanism (50). A second valve is connected in series between the preheating water tank (3) and the liquid flow controller (6). A preheating temperature sensor (4) for measuring the fluid temperature is also provided on the preheating water tank (3). An automatic exhaust valve (2) is also provided on the preheating water tank (3). The automatic exhaust valve (2) is used to exhaust the gas injected by the air intake mechanism (60). The cooling mechanism (50) includes a cooler, a cold water circulation pump, a cold water tank, and a cooling tower. The cooler includes an inner shell and an outer shell. One end of the inner shell is connected to the liquid outlet of the outer pipe (211), and the other end of the inner shell is connected to the first valve (1). The outer shell is connected in series with the cooling tower, the cold water tank, and the cold water circulation pump. The air intake mechanism (60) includes an air compressor (8), a gas cylinder (9), a gas flow controller (10), a gas flow meter (11), and a third valve (12) connected in series, wherein the third valve (12) is connected upstream of the hot water circulation pump (13).

5. The experimental apparatus for evaluating the temperature control of horizontal well drilling shafts according to claim 4, characterized in that, The horizontal well drilling wellbore temperature control evaluation experimental device also includes a computer (15), which is electrically connected to the preheating temperature sensor (4), the liquid flow controller (6), the liquid flow meter (7), the gas flow controller (10), the gas flow meter (11), the gas-liquid two-phase flow meter (14), the first pressure sensor (19), the second pressure sensor (25), the first temperature sensor (16), the second temperature sensor (24), the first thermocouple, the second thermocouple, the third thermocouple, and the frequency tuner.

6. A method for evaluating the temperature control of a horizontal wellbore, characterized in that, The experimental apparatus for evaluating the temperature control of horizontal well drilling shafts according to any one of claims 1 to 5 includes the following steps: The original experiment was conducted without using cooling processes or heat insulation tools; Comparative experiments were conducted using cooling techniques or heat insulation tools; The data from the two sets of experiments were compared and evaluated.

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