Performance test system and test method for screw drill

Abstract

The invention discloses a system and a method for testing the performance of a screw drill, and belongs to the technical field of well drilling. In the test system, the screw drill is connected to a screw drill complete machine test bed, the screw drill is accommodated in a heat preservation sleeve, and the two ends of the screw drill penetrate through the outside of the heat preservation sleeve in a sealed mode. The hot air circulation assembly comprises a heater, a fan, an air inlet pipeline and an air outlet pipeline, the two ends of the air inlet pipeline are connected to the heater and the heat preservation sleeve correspondingly, and the fan is located on the air inlet pipeline; two ends of the air outlet pipeline are connected to the electric control heater and the insulation sleeve; and the electric control assembly is used for controlling the operation of the heater and the fan. The testing system can simulate the underground high-temperature environment borne by the screw drill stator rubber, and is used for evaluating the influence of the stator rubber after underground high-temperature expansion on the output performance of the screw drill and evaluating the service life of the screw drill stator rubber working at high temperature.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and in particular to a screw drill performance testing system and testing method. Background Technology

[0002] As oil drilling depth increases, so does the ground temperature. Typically, the formation temperature increases by about 3°C ​​for every 1000 meters of depth. When drilling depth exceeds 10,000 meters, the downhole temperature usually reaches over 260°C. Since screw drills rely on stator rubber sealing to generate the power to rotate the drill bit, the stator rubber is prone to aging and failure under these high temperatures. This can cause the screw drill to lose power, resulting in unnecessary tripping operations and significantly increasing drilling costs.

[0003] In order to develop new types of rubber that can adapt to high-temperature working conditions, it is necessary to conduct temperature simulation tests on screw drills on indoor screw drill test benches. However, the known screw drill test benches currently available only have room temperature testing functions and cannot simulate high-temperature environments. Therefore, it is impossible to verify the output performance and temperature resistance rating of screw drills under high temperatures. Summary of the Invention

[0004] In view of this, the present invention provides a screw drill performance testing system and testing method, which can solve the technical problems existing in related technologies.

[0005] Specifically, the following technical solutions are included:

[0006] On the one hand, a screw drill performance testing system is provided, the testing system including: a screw drill whole machine test bench;

[0007] A screw drill bit, which is connected to a screw drill bit test bench for performance testing.

[0008] A thermal insulation sleeve, wherein the screw drill bit is housed within the thermal insulation sleeve and both ends of the screw drill bit extend sealed through to the outside of the thermal insulation sleeve;

[0009] A hot air circulation assembly includes a heater, a fan, an air inlet duct, and an air outlet duct. The two ends of the air inlet duct are respectively connected to the heater and the insulation sleeve, and the fan is mounted on the air inlet duct. The two ends of the air outlet duct are respectively connected to the electrically controlled heater and the insulation sleeve.

[0010] An electrical control component is provided for controlling the operation of the heater and the fan.

[0011] In some possible implementations, the heater is a silicon controlled rectifier (SCR) electric heater, the heater having a SCR rectifier electrically connected to the electronic control component;

[0012] And / or,

[0013] The fan is a centrifugal blower, which is used to maintain a constant temperature for the insulation sleeve.

[0014] In some possible implementations, both the air inlet duct and the air outlet duct are flexible ducts.

[0015] In some possible implementations, the air inlet duct includes a main duct and a plurality of sub-ducts arranged in parallel, one end of the plurality of sub-ducts being connected to the main duct, and the other end of the plurality of sub-ducts being connected to a plurality of air inlets provided on the insulation sleeve.

[0016] In some possible implementations, the electronic control component includes a controller and multiple temperature sensors, which are located at different positions on the insulation sleeve and are used to monitor the temperature of the insulation sleeve.

[0017] The controller is electrically connected to the temperature sensor, the heater, and the fan.

[0018] In some possible implementations, the electronic control component further includes: a temperature control display, which is electrically connected to the plurality of temperature sensors and the controller respectively, for displaying the temperature of the insulation sleeve;

[0019] The temperature control display also includes an alarm element, which is used to issue an alarm signal when the temperature of the insulation sleeve exceeds a set threshold.

[0020] In some possible implementations, the insulation sleeve includes a cylinder and connecting flanges connected to both ends of the cylinder distributed along its axial direction;

[0021] The cylinder comprises a stainless steel inner layer, an insulation layer, and a stainless steel outer layer, which are distributed radially from the inside to the outside.

[0022] In some possible implementations, the screw drill bit is provided with end sealing assemblies at both ends, which are used for sealing connection with the connecting flange.

[0023] In some possible implementations, the end sealing assembly includes: a sealing ring, a locking sleeve, a packing gland, and a packing gland cap;

[0024] The sealing ring includes a large-diameter sealing section and a small-diameter sealing section connected to each other. The large-diameter sealing section of the sealing ring is clamped between the inner wall of the connecting flange and the outer wall of the screw drill. The small-diameter sealing section of the sealing ring has an inner annular gap with the outer wall of the screw drill, and the small-diameter sealing section of the sealing ring has an outer annular gap with the inner wall of the connecting flange.

[0025] The bushing portion of the locking sleeve is fixedly connected to the connecting flange, and the end cap of the locking sleeve abuts against the end of the connecting flange;

[0026] The packing is located in the inner annular gap and abuts against the end of the large-diameter sealing section of the sealing ring. The packing gland extends into the inner annular gap to press the packing.

[0027] On the other hand, a screw drill performance testing method is provided, wherein the screw drill performance testing method adopts the above-mentioned screw drill performance testing system.

[0028] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0029] The screw drill performance testing system provided in this invention, based on a complete screw drill test bench, further adds an insulation sleeve, a hot air circulation assembly, and an electrical control assembly. The heater in the hot air circulation assembly heats the air to form hot air, which, under the action of a fan, is introduced into the insulation sleeve through an air inlet duct, thereby heating the screw drill inside the insulation sleeve. This heats the stator rubber of the screw drill to the desired temperature, simulating a high-temperature testing environment. Subsequently, under the simulated high-temperature testing environment, the performance of the screw drill can be tested using the complete screw drill test bench, thus verifying the output performance and temperature resistance rating of the screw drill at high temperatures. During the test, after the hot air heats the stator rubber, the cooled air returns to the heater through an air outlet duct for reheating, and this cycle is repeated to ensure that the stator rubber of the screw drill remains stable at the desired temperature. The heating process of the screw drill can be controlled by the electrical control assembly through the operation of the heater and the fan, ensuring the accuracy of the high-temperature environment simulation. In summary, the screw drill performance testing system provided in this embodiment of the invention can simulate the downhole high-temperature environment experienced by the stator rubber of the screw drill during drilling, and is thus used to evaluate the impact of the stator rubber's high-temperature expansion on the output performance of the screw drill, as well as to assess the service life of the screw drill stator rubber at high temperatures. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an exemplary screw drill performance testing system provided in an embodiment of the present invention;

[0032] Figure 2 A partial structural enlarged view of an exemplary screw drill performance testing system provided in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram illustrating the installation relationship between an exemplary thermal insulation sleeve and a hydraulic self-aligning mechanism, provided for an embodiment of the present invention.

[0034] The reference numerals in the attached figures represent:

[0035] 100. Test bench for screw drill bit assembly;

[0036] 200. Screw drill bit; 21. End sealing assembly; 211. Sealing ring; 212. Locking sleeve; 213. Packing; 214. Packing gland;

[0037] 300. Insulation sleeve; 31. Cylinder body; 311. Stainless steel inner layer; 312. Insulation layer; 313. Stainless steel outer layer; 32. Connecting flange;

[0038] 400. Hot air circulation assembly; 41. Heater; 42. Fan; 43. Inlet duct; 431. Main duct; 432. Sub-duct; 44. Outlet duct;

[0039] 500. Electrical control components; 51. Controller; 52. Temperature sensor; 53. Temperature display;

[0040] 600. Hydraulic self-aligning mechanism.

[0041] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] In response to the problem that currently known screw drill test benches only have room temperature testing capabilities and cannot simulate high-temperature environments, thus failing to verify the output performance and temperature resistance rating of screw drills at high temperatures, this invention provides a novel screw drill performance testing system.

[0045] Appendix Figure 1 The structure of the screw drill performance testing system is illustrated in the attached figure. Figure 1 As shown, the screw drill performance testing system includes: a screw drill complete machine test bench 100, a screw drill 200, an insulation sleeve 300, a hot air circulation assembly 400, and an electrical control assembly 500. The screw drill 200 is connected to the screw drill complete machine test bench 100 for performance testing; the screw drill 200 is housed within the insulation sleeve 300, with both ends of the screw drill 200 sealingly extending to the outside of the insulation sleeve 300.

[0046] The hot air circulation assembly 400 includes a heater 41, a fan 42, an air inlet duct 43, and an air outlet duct 44. The two ends of the air inlet duct 43 are connected to the heater 41 and the insulation sleeve 300, respectively, and the fan 42 is mounted on the air inlet duct 43. The two ends of the air outlet duct 44 are connected to the electrically controlled heater 41 and the insulation sleeve 300, respectively. An electrical control assembly 500 is used to control the operation of the heater 41 and the fan 42.

[0047] The screw drill performance testing system provided in this embodiment of the invention further adds an insulation sleeve 300, a hot air circulation assembly 400, and an electrical control assembly 500 to the screw drill whole machine test bench 100. The heater 41 in the hot air circulation assembly 400 heats the air to form hot air. Under the action of the fan 42, the hot air is input into the insulation sleeve 300 through the air inlet pipe 43, thereby heating the screw drill 200 inside the insulation sleeve 300, raising the stator rubber of the screw drill 200 to the desired temperature, thus simulating a high-temperature testing environment. Subsequently, under the simulated high-temperature testing environment, the performance of the screw drill 200 can be tested using the screw drill whole machine test bench 100, thereby verifying the output performance and temperature resistance rating of the screw drill 200 at high temperatures. During the test, after the hot air heats the stator rubber, the cooled air returns to the heater 41 through the air outlet pipe 44 for reheating, and this cycle is repeated to ensure that the stator rubber of the screw drill 200 remains stable at the desired temperature. The heating process of the screw drill 200 can be controlled by the operation control of the heater 41 and the fan 42 through the electronic control component 500 to ensure the simulation accuracy of the high temperature environment.

[0048] In summary, the screw drill performance testing system provided in this embodiment of the invention can simulate the downhole high-temperature environment experienced by the stator rubber of the screw drill 200 during drilling, and is thus used to evaluate the impact of the stator rubber's expansion at high downhole temperatures on the output performance of the screw drill 200, as well as to assess the service life of the stator rubber of the screw drill 200 at high temperatures.

[0049] The following is an exemplary description of the structural layout and function of each component involved in the screw drill performance testing system.

[0050] The screw drill test bench 100, also known as a screw drill test bench or screw drill test frame, is a well-known screw drill performance testing device in the art, and this embodiment of the invention does not impose specific limitations on it.

[0051] The screw drill 200 is fixed and installed on the screw drill test bench 100. After the screw drill 200 is heated to the desired constant temperature, the performance test of the screw drill 200 can be carried out using the screw drill test bench 100, thereby simulating the operating state of the screw drill 200 after the stator rubber is heated.

[0052] In this embodiment of the invention, the screw drill 200 is housed within the insulation sleeve 300 and both ends of the screw drill 200 extend through the outside of the insulation sleeve 300 in a sealed manner. The two ends of the screw drill 200 located outside the insulation sleeve 300 are used for fixed installation on the screw drill whole machine test bench 100.

[0053] In some examples, heater 41 is a silicon controlled rectifier (SCR) electric heater, which has a SCR rectifier electrically connected to the electrical control component 500.

[0054] The thyristor-controlled electric heater 41 uses a stainless steel heating element. The thyristor rectifier can adjust the heating power of the heater 41 by regulating the voltage across the stainless steel heating element. When the thyristor rectifier receives a command from the control unit 500, it opens the circuit to allow current to flow, thus starting the heater 41 to heat. When the control command disappears, the thyristor rectifier automatically closes the circuit, thus stopping the heater 41 from heating.

[0055] It can be seen that the temperature control of heater 41 can be achieved by adjusting the on and off time of the thyristor rectifier.

[0056] In this embodiment of the invention, a fan 42 is provided on the air inlet pipe 43 between the heater 41 and the insulation sleeve 300 to input hot air into the insulation sleeve 300 at a certain rate. In some examples, the fan 42 is a centrifugal blower 42, which is used to maintain the constant temperature of the insulation sleeve 300.

[0057] The centrifugal blower 42 has the advantage of excellent exhaust and air supply effect. By setting the blower 42 on the air inlet pipe 43 on the outlet side of the heater 41, the air volume can be adjusted by adjusting the working frequency of the variable frequency motor equipped with the blower 42, thereby adjusting the circulation speed of the hot air, and finally helping to achieve constant temperature control of the insulation sleeve 300, that is, to achieve constant temperature control of the stator rubber of the screw drill 200.

[0058] In this embodiment, the hot air is transferred to the stator rubber via heat conduction. The temperature of the hot air decreases, and it returns to the heater 41 through the air outlet duct 44. The heater 41 then reheats the cooled air and it enters the next cycle.

[0059] In some examples, an exhaust outlet can be provided on the air duct 44, and a plug can be provided on the exhaust outlet to facilitate the discharge of exhaust gas as needed.

[0060] In some examples, both the air inlet duct 43 and the air outlet duct 44 are flexible ducts, for example, both are corrugated hoses, which can be bent at will, facilitating the layout and installation of components such as the heater 41 and the fan 42.

[0061] In some examples, such as the attached Figure 1As shown, the air inlet duct 43 includes a main duct 431 and multiple sub-ducts 432 arranged in parallel. One end of each sub-duct 432 is connected to the main duct 431, and the other end of each sub-duct 432 is connected to multiple air inlets provided on the insulation sleeve 300.

[0062] The above scheme facilitates the smooth and rapid introduction of hot air into the insulation sleeve 300, ensuring its even distribution within the sleeve and guaranteeing uniform heating of the stator rubber of the screw drill 200. For example, multiple air inlets are evenly arranged on the upper sidewall of the insulation sleeve 300. Figure 1 An example is provided with an air inlet at each end of the upper sidewall of the insulation sleeve 300, which is connected to two sub-pipes 432. Furthermore, an air outlet is provided on the lower sidewall of the insulation sleeve 300 (e.g., its middle region), which is connected to the air outlet duct 44.

[0063] In some examples, such as the attached Figure 1 As shown, the electrical control assembly 500 includes a controller 51 and multiple temperature sensors 52. The multiple temperature sensors 52 are located at different positions of the insulation sleeve 300 and are used to monitor the temperature of the insulation sleeve 300. The controller 51 is electrically connected to the temperature sensors 52, the heater 41, and the fan 42.

[0064] Temperature sensor 52 monitors the temperature of the insulation sleeve 300 and transmits the data to controller 51. When temperature sensor 52 detects that the temperature of the insulation sleeve 300 is lower than the set temperature, controller 51 activates the control circuit to turn on the thyristor rectifier in heater 41, thus initiating heating operation in heater 41. Simultaneously, controller 51 optionally sends a command to fan 42 to adjust the operating frequency of the variable frequency motor equipped with fan 42, thereby regulating the airflow and rapidly raising the temperature of insulation sleeve 300 to the set temperature. When temperature sensor 52 detects that the temperature of insulation sleeve 300 has reached the set temperature, controller 51 controls the thyristor rectifier in heater 41 to turn off, thus stopping heater 41 from heating.

[0065] As can be seen, by arranging the electrical control components 500 as described above, and through continuous monitoring and temperature control, constant temperature control of the insulation sleeve 300 can be achieved.

[0066] In some examples, multiple temperature sensors 52 can be disposed on the inner wall of the insulation sleeve 300. For instance, one temperature sensor 52 can be disposed in the middle region of the inner wall of the insulation sleeve 300 as a temperature measuring point, and two temperature sensors 52 can be disposed at each end of the inner wall of the insulation sleeve 300 as the other two temperature measuring points. The temperature measured by the temperature sensor 52 located in the middle region of the inner wall of the insulation sleeve 300 can be used as the actual monitored temperature, and the temperatures of the other two temperature sensors 52 can be used as a comparison reference. Of course, the average of the sum of the temperatures measured by the three temperature sensors 52 can also be used as the actual monitored temperature.

[0067] In some examples, such as the attached Figure 1 As shown, the electronic control assembly 500 also includes a temperature control display 53, wherein the temperature control display 53 is electrically connected to a plurality of temperature sensors 52 and a controller 51 respectively, and is used to display the temperature of the insulation sleeve 300.

[0068] Temperature sensor 52 monitors the internal temperature of insulation sleeve 300 in real time and transmits it to temperature control display 53 for display. It can also observe the temperature rise inside insulation sleeve 300 in a timely manner and determine whether the temperature has successfully reached the set temperature threshold so as to facilitate manual intervention. At the same time, temperature control display 53 can also transmit the received temperature signal to controller 51 so that controller 51 can control the operation of fan 42 and heater 41 according to the actual monitored temperature.

[0069] In some examples, the temperature control display 53 also includes an alarm element for issuing an alarm signal when the temperature of the insulation sleeve 300 exceeds a set threshold. For example, the alarm signal can be an audible alarm signal or a visual alarm signal.

[0070] When the temperature of the insulation sleeve 300 exceeds the set threshold, the controller 51 receives the over-temperature signal and sends an alarm command to the alarm element. As a result, the alarm element sends an over-temperature alarm signal. At the same time, the controller 51 can control the heater 41 and the fan 42 to stop running, thereby realizing further intelligent control of the temperature of the insulation sleeve 300.

[0071] In some examples, the temperature display 53 has a waterproof element (e.g., a waterproof coating or a waterproof cover) on its exterior. The waterproof element is used to waterproof the temperature display 53 to prevent the test water from splashing out and damaging the temperature display 53.

[0072] In the embodiments of the present invention, as shown in the appendix Figure 2As shown, the insulation sleeve 300 includes a cylinder 31 and connecting flanges 32 connected to the cylinder 31 at both ends distributed along its axial direction; the cylinder 31 includes a stainless steel inner layer 311, an insulation layer 312 and a stainless steel outer layer 313 distributed in the radial direction from the inside to the outside.

[0073] By incorporating an insulation layer 312 within the insulation sleeve 300, the insulation effect of the sleeve 300 is enhanced, preventing heat loss. For example, the insulation layer 312 can be aluminum silicate refractory fiber cotton. Furthermore, by providing connecting flanges 32 at both ends of the insulation sleeve 300, a convenient and effective sealing connection with the screw drill tool 200 can be achieved via the connecting flanges 32.

[0074] For example, the insulation sleeve 300 is cylindrical, with its outer stainless steel layer 313 made of 5mm thick stainless steel plate, its inner stainless steel layer 311 made of 5mm thick stainless steel plate, and an insulation layer 312 filling the space between the outer and inner stainless steel layers 313 and 311. The connecting flange 32 can be made of 10mm thick stainless steel plate. Furthermore, the insulation sleeve 300 has lifting lugs in the middle for easy lifting.

[0075] As mentioned above, the screw drill 200 is housed within the insulation sleeve 300, and both ends of the screw drill 200 extend sealed to the outside of the insulation sleeve 300 to ensure that the space inside the insulation sleeve 300 is sealed and to prevent heat loss.

[0076] In some examples, such as the attached Figure 2 As shown, the screw drill 200 is provided with end sealing components 21 at both ends, which are used to seal the connection with the connecting flange 32.

[0077] For example, as shown in the appendix Figure 2 As shown, the end sealing assembly 21 includes: a sealing ring 211, a locking sleeve 212, a packing gland 213, and a packing gland 213 gland. The sealing ring 211 includes a large-diameter sealing section and a small-diameter sealing section connected together. The large-diameter sealing section of the sealing ring 211 is clamped between the inner wall of the connecting flange 32 and the outer wall of the screw drill 200. An inner annular gap exists between the small-diameter sealing section of the sealing ring 211 and the outer wall of the screw drill 200, and an outer annular gap exists between the small-diameter sealing section of the sealing ring 211 and the inner wall of the connecting flange 32. The bushing portion of the locking sleeve 212 is fixedly connected to the connecting flange 32, meaning that the bushing portion of the locking sleeve 212 is located within the outer annular gap, and the end cap of the locking sleeve 212 abuts against the end of the connecting flange 32, thereby achieving stable assembly of the sealing ring 211. The packing 213 is located in the inner annular gap and abuts against the end of the large-diameter sealing section of the sealing ring 211. The packing 213 gland extends into the inner annular gap to press the packing 213.

[0078] The aforementioned end sealing assembly 21 enables an efficient and reliable sealing effect at the connection between the screw drill bit 200 and the insulation sleeve 300. The sealing ring 211 can be made of a high-temperature resistant rubber material.

[0079] In some examples, multiple end sealing assemblies 21 may be provided, wherein the inner diameters of the sealing rings 211, packing 213, and packing 213 glands of these multiple end sealing assemblies 21 are different from each other, but the outer diameters are the same, to adapt to screw drills 200 with different outer diameters, thereby adapting to different test scenarios.

[0080] Furthermore, the screw drill performance testing system provided in this embodiment of the invention, as shown in the attached figure... Figure 3 As shown, it may also include a hydraulic self-aligning mechanism 600, which is located below the insulation sleeve 300. The hydraulic self-aligning mechanism 600 is used to adjust the concentricity of the insulation sleeve 300 and the screw drill 200, thereby achieving reliable installation of the end sealing assembly 21.

[0081] Based on the aforementioned screw drill performance testing system, the operation process of the screw drill performance testing system will be described below as an example.

[0082] First, select an end sealing assembly 21 of appropriate specifications and fit it onto the outer wall of the screw drill 200 to be tested. Then, use a crane to lift the insulation sleeve 300 and fit it onto the outside of the screw drill 200, with the insulation sleeve 300 aligned with the middle section of the stator rubber. Finally, assemble another end sealing assembly 21 at the other end of the screw drill 200. Subsequently, assemble the screw drill 200 with the insulation sleeve 300 onto the screw drill test bench 100, and assemble the end sealing assembly 21 and the connecting flange 32 at the end of the insulation sleeve 300. Optionally, use a hydraulic self-aligning mechanism 600 to adjust the height and level of the insulation sleeve 300, ensuring that the insulation sleeve 300 and the screw drill 200 are concentric, and then install the end sealing assembly 21 and the connecting flange 32.

[0083] After the end sealing assembly 21 and the connecting flange 32 are installed, the height of the hydraulic self-aligning mechanism 600 is lowered so that it is removed from the insulation sleeve 300, so that the vibration of the insulation sleeve 300 will not affect the function of the hydraulic self-aligning mechanism 600 during the test of the screw drill 200.

[0084] Subsequently, the insulation sleeve 300 is connected to the heater 41, fan 42, etc., through the air inlet pipe 43 and the air outlet pipe 44, while the electrical control component 500 is electrically connected to the hot air circulation component 400. The temperature to be tested (i.e., the temperature threshold) is set on the controller 51, and the heater 41 and fan 42 are turned on, and the hot air circulation begins to run.

[0085] Observe the temperature rise using the temperature control display 53, and check for leaks in the relevant pipes of the hot air circulation assembly 400 based on the temperature rise. If any leaks are found, stop the machine immediately for repair. After observing that the internal temperature of the insulation sleeve 300 reaches the set test temperature as shown on the temperature control display 53, continue heating for a certain period of time, such as half an hour. When the temperature difference between the two ends and the middle position inside the insulation sleeve 300 is less than 5°C, the performance test of the screw drill 200 begins.

[0086] After the test is completed, heater 41 is stopped, exhaust port is opened to discharge hot air, and when temperature control display 53 shows that the temperature is close to room temperature, insulation sleeve 300 and other related equipment can be disassembled.

[0087] In summary, the screw drill performance testing system provided in this embodiment of the invention, under the control of the electronic control component 500, heats air through the hot air circulation component 400 and inputs it into the insulation sleeve 300, thereby heating the stator rubber of the screw drill 200. The cooled air then returns to the hot air circulation component 400, achieving constant temperature control of the stator rubber of the screw drill 200 and effectively simulating the high-temperature environment downhole. Therefore, the temperature resistance level and fatigue failure mode of the screw drill 200 can be effectively evaluated without conducting downhole field tests. Simultaneously, it can reduce the testing costs of drilling operations and significantly shorten the development process of the stator rubber formulation for the screw drill 200.

[0088] On the other hand, embodiments of the present invention also provide a screw drill performance testing method, which employs any of the screw drill performance testing systems mentioned above.

[0089] The screw drill performance testing method provided in this embodiment of the invention has all the advantages of any of the screw drill performance testing systems mentioned above, and will not be repeated here.

[0090] In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0091] The above description is merely for the purpose of enabling those skilled in the art to understand the technical solutions of the present invention, and is not intended to limit the present invention. 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. A screw drill performance testing system, characterized in that, The testing system includes: a screw drill complete machine test bench (100); A screw drill bit (200) is connected to a screw drill bit test bench (100) for performance testing. Insulating sleeve (300), wherein the screw drill (200) is housed within the insulating sleeve (300) and both ends of the screw drill (200) extend sealed to the outside of the insulating sleeve (300); A hot air circulation assembly (400) includes a heater (41), a fan (42), an air inlet duct (43), and an air outlet duct (44). The two ends of the air inlet duct (43) are respectively connected to the heater (41) and the insulation sleeve (300), and the fan (42) is mounted on the air inlet duct (43). The two ends of the air outlet duct (44) are respectively connected to the electrically controlled heater (41) and the insulation sleeve (300). An electrical control component (500) is used to control the operation of the heater (41) and the fan (42).

2. The screw drill performance testing system according to claim 1, characterized in that, The heater (41) is a silicon controlled rectifier (SCR) heater (41), the heater (41) has a SCR rectifier, and the SCR rectifier is electrically connected to the electrical control component (500); And / or, The fan (42) is a centrifugal blower (42), and the fan (42) is used to control the temperature of the insulation sleeve (300).

3. The screw drill performance testing system according to claim 1, characterized in that, Both the air inlet duct (43) and the air outlet duct (44) are flexible ducts.

4. The screw drill performance testing system according to claim 3, characterized in that, The air inlet duct (43) includes a main duct (431) and a plurality of sub-ducts (432) arranged in parallel. One end of the plurality of sub-ducts (432) is connected to the main duct (431), and the other end of the plurality of sub-ducts (432) is connected to a plurality of air inlets provided on the insulation sleeve (300).

5. The screw drill performance testing system according to claim 1, characterized in that, The electronic control component (500) includes a controller (51) and multiple temperature sensors (52), which are located at different positions on the insulation sleeve (300) and are used to monitor the temperature of the insulation sleeve (300). The controller (51) is electrically connected to the temperature sensor (52), the heater (41), and the fan (42).

6. The screw drill performance testing system according to claim 5, characterized in that, The electronic control assembly (500) further includes a temperature control display (53), which is electrically connected to the plurality of temperature sensors (52) and the controller (51) respectively, and is used to display the temperature of the insulation sleeve (300); The temperature control display (53) also includes an alarm element, which is used to issue an alarm signal when the temperature of the insulation sleeve (300) exceeds a set threshold.

7. The screw drill performance testing system according to any one of claims 1-6, characterized in that, The insulation sleeve (300) includes a cylinder (31) and connecting flanges (32) at both ends of the cylinder (31) distributed along its axial direction. The cylinder (31) includes a stainless steel inner layer (311), a heat insulation layer (312), and a stainless steel outer layer (313) distributed in the radial direction from the inside to the outside.

8. The screw drill performance testing system according to claim 7, characterized in that, The screw drill (200) is provided with end sealing assemblies (21) at both ends, and the end sealing assemblies (21) are used to seal the connection with the connecting flange (32).

9. The screw drill performance testing system according to claim 8, characterized in that, The end sealing assembly (21) includes: a sealing ring (211), a locking sleeve (212), a packing (213), and a packing (213) gland; The sealing ring (211) includes a large-diameter sealing section and a small-diameter sealing section connected together. The large-diameter sealing section of the sealing ring (211) is clamped between the inner wall of the connecting flange (32) and the outer wall of the screw drill (200). There is an inner annular gap between the small-diameter sealing section of the sealing ring (211) and the outer wall of the screw drill (200), and there is an outer annular gap between the small-diameter sealing section of the sealing ring (211) and the inner wall of the connecting flange (32). The bushing portion of the locking sleeve (212) is fixedly connected to the connecting flange (32), and the end cap of the locking sleeve (212) abuts against the end of the connecting flange (32); The packing (213) is located in the inner annular gap and abuts against the end of the large-diameter sealing section of the sealing ring (211). The packing (213) gland extends into the inner annular gap to press the packing (213).

10. A method for testing the performance of a screw drill bit, characterized in that, The screw drill performance testing method adopts the screw drill performance testing system according to any one of claims 1-9.

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