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How is fatigue wear of petroleum drill collars caused
release time：2024-05-31
source： network
The fatigue wear of petroleum drill collars mainly considers the following aspects:
1. Dynamic variation of drilling pressure: In the process of oil drilling, the drilling pressure of drilling tools is in a dynamic variation process. When the drilling pressure changes, the stress center point of the drill string will also change, leading to alternating tensile stress on both sides of the drill string. This long-term and frequent dynamic stress change can cause fatigue in drilling tool materials, ultimately leading to fatigue wear.
2. Alternating contact stress: During the operation of petroleum drill collars, their surface will generate relative motion with rock layers, drilling fluids, and other substances. This relative motion will cause significant alternating contact stress on the material's microvolume due to periodic loads. When this stress exceeds the fatigue strength of the material, fatigue cracks will appear on the surface and continue to propagate, ultimately causing the surface material to detach and resulting in fatigue wear.
3. The relationship between drill string rotation speed and natural frequency: The research results show that when the rotation speed of the drill string is close to its natural frequency, the drill string is more prone to fatigue. This is because in this situation, the vibration and stress distribution of the drill string will become more complex, thereby increasing the risk of fatigue wear.
4. Structure and material characteristics of drilling tools: The thread of petroleum drilling tools is the weakest link in the entire drilling tool, and its service life is relatively short under frequent complex alternating stresses. In addition, the material properties of drilling tools, such as hardness and toughness, can also affect their ability to resist fatigue wear.
From this, it can be seen that the fatigue wear of petroleum drill collars is caused by various factors such as dynamically changing drilling pressure, alternating contact stress, the relationship between drill string rotation speed and natural frequency, as well as the structure and material properties of drilling tools. In order to reduce the occurrence of fatigue wear, corresponding preventive measures need to be taken, such as optimizing drilling tool design, controlling drilling pressure and speed, strengthening the maintenance and upkeep of drilling tools, etc.
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