Abrasion resistance testing principle and device for rock core pipe of myriameter high-temperature drilling tool

Abstract

A rock core tube wear resistance testing principle and device for a myriameter high-temperature drilling tool relates to the technical field of drilling tool testing and comprises a base, a cabin, a hydraulic motor, a supporting table, a chain wheel and chain structure, a rock core tube mounting component and the like. According to the specific structure for installing the rock core pipe, the rock core pipe to be tested is installed between the fixed mandrel and the rotary sleeve, the two sides of the rock core pipe are pressed through the end covers, the tail of the right side of the mandrel is fixedly connected with the fixed tailstock to prevent the fixed tailstock from rotating, the left end cover is fixedly connected with the coupler through a screw, and the coupler is connected with the rotary chain wheel shaft. The inner wall wear resistance testing experiment can be completed through rotation friction between rotation of the rock core pipe and the fixed mandrel, and meanwhile, the surface quality and the wear condition of the inner wall of the rock core pipe can be detected in real time through the ultrasonic detection device embedded in the coupler. According to the invention, the performance test and the service life test of the inner wall of the rock core pipe under the high-temperature environment of 300 DEG C can be carried out.

Description

Technical Field

[0001] The invention relates to the technical field of deep well drilling coring device testing, and in particular to a device for testing the wear resistance of the inner wall of a core tube of a coring device in a high temperature environment of 10,000 meters. Background Art

[0002] The efficient development of deep underground oil and gas resources is of great significance to ensuring national energy security and achieving energy succession. The working environment of ultra-deep wells is about 10,000 meters underground. If the drilling tools go directly underground for field performance testing, quantitative testing is difficult, and complex environmental conditions have a profound negative impact on sample collection results. Therefore, it is urgent to develop a 10,000-meter high-temperature simulated drilling corer test device to simulate the actual underground working conditions, implement inner wall wear pre-testing on the ground, identify defects and deficiencies of the tested parts through early detection, and provide empirical data for design verification, which will help optimize structural design and reduce R&D costs.

[0003] Test Principle

[0004] In the wear resistance test of 10,000-meter high-temperature core tubes, ultrasonic detection devices are used as key technical means to monitor the surface quality and wear of the inner wall of the core tube in real time. Ultrasonic detection relies on the propagation and reflection characteristics of sound waves in solid media. By analyzing the changes in echo signals, it can accurately evaluate the thickness of the tube wall and surface defects. This technology has the advantages of high precision, non-destructiveness, and real-time performance, and is particularly suitable for complex core tube wear test environments.

[0005] The ultrasonic testing device uses a probe to emit high-frequency sound waves to the core tube, and the sound waves are partially reflected when penetrating the tube wall. During the detection process, the ultrasonic wave will produce multiple reflections when passing through the core tube wall, including reflected waves returning from the outer wall and the inner wall. When defects such as wear, cracks or depressions appear on the inner wall, the time, intensity and waveform of the reflected signal will change significantly. Usually, the intensity of the reflected wave will be weakened or the waveform will be deformed, which can help identify the nature of the defect, such as cracks, spalling or depressions. By accurately measuring the reflection time difference, the depth and range of the wear area can be calculated and the degree of the defect can be evaluated.

[0006] In addition, ultrasound can also generate two-dimensional or three-dimensional images of the inner wall of the core tube through multi-channel detection and scanning imaging technology, thereby intuitively showing the surface quality and wear distribution. This process can dynamically monitor the damage of the tube wall during the wear resistance test and provide reliable data support for experimental analysis.

[0007] The ultrasonic device can be equipped with a multi-channel probe array to achieve a wider range of detection by synchronously collecting echo data from multiple points. By moving the probe or rotating the core barrel, the detection system can generate a two-dimensional or three-dimensional image to intuitively display the surface quality and wear distribution of the inner wall. This method is particularly suitable for evaluating uniform wear over a large area or locating local severe defects.

[0008] During the wear test of the core barrel, the ultrasonic testing device can monitor the inner wall surface quality in real time through continuous scanning. The detection system usually includes a high-resolution probe, a multi-channel signal processor, and real-time data analysis software. The probe moves along the inner wall of the core barrel, continuously transmits and receives sound waves, and collects and processes the reflected signals in real time. To achieve real-time detection, the system uses fast Fourier transform (FFT) to perform spectral analysis on the signal, and combines pattern recognition algorithms to automatically classify and evaluate surface defects. Through data visualization technology, the test results will be dynamically displayed in the form of thickness distribution diagrams or defect distribution diagrams, allowing operators to understand the quality changes of the pipe wall at any time.

[0009] The application of ultrasonic detection devices in the wear resistance test of 10,000-meter high-temperature core tubes can not only evaluate the wear of the tube wall in real time, but also find early defects such as crack extension or coating peeling during the test. This provides a scientific basis for improving the service life and safety of core tubes, and also provides important support for subsequent maintenance and optimized design.

[0010] Through this technology, the wear rate of the core barrel can be accurately recorded, and the impact of different working conditions on the wear resistance can be deeply analyzed, laying the foundation for the development of more durable core barrel materials. Summary of the invention

[0011] Based on the above problems, the purpose of the present invention is to provide a 10,000-meter high-temperature drill core tube wear resistance testing device, which can simulate the actual working conditions of 300°C in ultra-deep wells to the greatest extent, display the invisible and complex underground environment through the test bench, and complete the performance test and life test of the drill core tube in a high-temperature oil immersion environment.

[0012] The technical solution adopted by the present invention to achieve its invention purpose is: a 10,000-meter high-temperature drilling tool core tube wear resistance testing device, including a base, a cabin, a hydraulic motor, a chain sprocket mechanism, and a core tube installation assembly.

[0013] The structure of the core tube installation assembly is as follows: the core tube to be tested is installed between the fixed core shaft and the rotating sleeve, the two sides of the core tube are pressed by end covers, the right tail of the core shaft is fixedly connected to the fixed tailstock to prevent it from rotating, the left end cover is connected to the rotating sprocket shaft through a self-aligning ball bearing coupling, the other end of the sprocket chain traditional mechanism is connected to the output shaft of the hydraulic motor, the cabin is filled with 300°C high-temperature oil, so that the entire device is immersed in the oil, and the hydraulic motor is outside the cabin and fixed on the base.

[0014] The beneficial effects of the present invention are:

[0015] It can simulate the 300-degree Celsius high-temperature working environment of a deep underground well. Through this test platform, the high-temperature working environment of a deep underground well is transformed into a visual simulation environment. Under this high-temperature simulation condition, it successfully performed the performance evaluation and durability test of the core barrel, the core component of the drilling tool, and effectively revealed potential defects and deficiencies in advance. This process not only provides valuable experimental basis for the design optimization of the tested components, but also helps structural improvement, significantly reducing the cost investment in the product development process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a three-dimensional appearance of an embodiment of the present invention;

[0017] Figure 2 A top view of an embodiment of the present invention;

[0018] Figure 3 A top view of a core barrel installation assembly and related components according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 Section view along AA; DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figures 1 to 4 A specific embodiment of the drilling tool core barrel testing device provided by the present invention is shown, comprising a hydraulic motor 1, a base 2, a cabin 3, a chain 4, a sprocket 5, a core barrel mounting assembly, a support platform 16, and a transmission shaft 17, wherein:

[0022] The hydraulic motor 1 is fixedly mounted on the base 2, the cabin 3 is mounted on the support platform 16, high-temperature oil is injected into the cabin 3, and the core tube mounting assembly is located below the oil level.

[0023] The core tube installation assembly structure is:

[0024] The core tube 13 to be tested is installed between the sleeve 12 and the core shaft 14, the right side of the core tube 13 is pressed by the end cover 18, the tail end of the core shaft 14 is fixedly connected to the fixed tailstock 15 by screws, the fixed tailstock 15 is connected to the base 2 by screws, and the left side of the core shaft 14 is supported by a self-aligning ball bearing 1001 and a graphite filler 1002; the left side of the core tube 13 is also pressed by the end cover 11, the end cover 11 and the sleeve 12 are fastened by screws, the end cover 11 is connected to the coupling 10 by interference fit, the coupling 10 is connected to the transmission shaft 17, the sprocket 5 is installed on the transmission shaft 17, the chain 4 cooperates with the output shaft of the hydraulic motor 1, and the motion is transmitted to the sleeve 12 and the core tube 13 to be tested by rotation.

[0025] The method and principle of using the testing device of the present invention to test the core barrel of the drilling tool are as follows:

[0026] The core shaft 14 is fixed and remains motionless, and the transmission shaft 17 drives the core tube 13 to rotate through the coupling 10, the end cover 11, and the sleeve 12 in sequence. The inner wall of the core tube contacts the outer wall of the core shaft 14, generating a surface rotation relative motion, which can complete the inner wall wear resistance test experiment. At the same time, the ultrasonic detection device embedded in the coupling can detect the surface quality and wear condition of the inner wall of the core tube in real time.

[0027] The above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes and modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A 10,000-meter high-temperature drilling tool core tube wear test principle and device, characterized in that: It includes a hydraulic motor 1, a base 2, a cabin 3, a chain 4, a sprocket 5, a core tube mounting assembly, a support platform 16, and a transmission shaft 17, wherein: The hydraulic motor 1 is fixedly mounted on the base 2, the cabin 3 is mounted on the support platform 16, high-temperature oil is injected into the cabin 3, and the core tube mounting assembly is located below the oil level. The core tube installation assembly structure is: The core tube 13 to be tested is installed between the sleeve 12 and the core shaft 14, the right side of the core tube 13 is pressed by the end cover 18, the tail end of the core shaft 14 is fixedly connected to the fixed tailstock 15 by screws, the fixed tailstock 15 is connected to the base 2 by screws, and the left side of the core shaft 14 is supported by a self-aligning ball bearing 1001 and a graphite filler 1002; the left side of the core tube 13 is also pressed by the end cover 11, the end cover 11 and the sleeve 12 are fastened by screws, the end cover 11 is connected to the coupling 10 by interference fit, the coupling 10 is connected to the transmission shaft 17, the sprocket 5 is installed on the transmission shaft 17, the chain 4 cooperates with the output shaft of the hydraulic motor 1, and the motion is transmitted to the sleeve 12 and the core tube 13 to be tested by rotation. The method and principle of using the testing device of the present invention to test the drilling core tube are as follows: The core shaft 14 is fixed and remains motionless, and the transmission shaft 17 drives the core tube 13 to rotate through the coupling 10, the end cover 11, and the sleeve 12 in sequence. The inner wall of the core tube 13 contacts the outer wall of the core shaft 14, generating a surface rotation relative motion, which can complete the inner wall wear resistance test experiment. At the same time, the ultrasonic detection device embedded in the coupling can detect the surface quality and wear condition of the inner wall of the core tube in real time.

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