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What are the wear and tear conditions of petroleum drill collars after use
release time：2024-05-27
source： network
Oil drill collars will experience various types of wear and tear after use, mainly including the following types:
1. Fatigue wear: This is due to the cyclic alternating contact stress on the drill collar during long-term use, resulting in repeated deformation of the material. 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. This type of wear is mainly characterized by microcracks and micro cutting during low angle erosion, while crack propagation and brittle fracture during high angle erosion.
2. Abrasive wear: This is a surface abrasion and material detachment caused by the relative movement of external hard particles or micro peaks on the surface of the drill collar. The mechanism of this type of wear includes micro cutting, fracture caused by multiple plastic deformations, and micro fracture. Its surface features include scratches, tears, longitudinal tensile marks, local peeling, and cracks.
3. Adhesive wear: When two sliding surfaces are subjected to excessive heavy loads or poor lubrication, the stress at the contact point becomes significant, leading to plastic deformation of the material and a sharp increase in surface temperature. This causes the metal on the contact surface to melt and rapidly cool, resulting in localized solid-state welding. During relative sliding, the adhesive joint will be sheared, forming debris and causing damage to the friction surface.
4. Corrosion and wear: Chemical or electrochemical reactions occurring on the friction surface will generate corrosive substances, which will be worn off in subsequent friction. This type of wear process has both corrosion and wear effects, and its essence is that chemical corrosion occurs first, followed by mechanical abrasive wear.
In addition, it should be noted that the wear rate of drill collars may accelerate after the quenching treatment layer on their surface wears out. At the same time, there may be obvious scratches on the surface of the drill rod taken out during deep hole drilling, which is also a manifestation of abrasive wear.
In order to extend the service life of petroleum drill collars and reduce the occurrence of wear, users should choose and use drill collars reasonably, pay attention to the control of drilling fluid viscosity and sand content parameters, and regularly maintain and inspect them.
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