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What factors are related to the lifespan of drill collars
release time：2024-06-13
source： network
The lifespan of drill collars is closely related to multiple factors, and the following are the main influencing factors and their detailed explanations:
1. Material of drilling tools:
· Steel: One of the commonly used materials for non-magnetic drill collars, such as high-speed steel, tool steel, etc., with characteristics such as wear resistance, high hardness, and good toughness.
· Hard alloy: made of tungsten, cobalt and other metals, characterized by high hardness, high strength, corrosion resistance, etc., suitable for materials with high processing difficulty.
· Ceramics: have excellent high temperature, wear resistance, and corrosion resistance, but poor toughness, and may experience fracture during processing.
2. Repair and maintenance status of drilling tools:
· Long term disrepair: Drilling tools have a lifespan, and long term disrepair can reduce their lifespan and efficiency.
· Poor repair: For example, poor quality of welding joints, improper heat treatment during welding leading to brittleness and microcracks in the drilling tool body, and excessive stress concentration caused by incorrect cutting tools or operations during the production of drill collar stress grooves and threads.
3. Maintenance and storage of drilling tools:
· Placement method: When placing in warehouses, well sites, or pipe stations, stacking multiple layers or not placing proper bedding may cause bending deformation or damage to the drilling tools.
· Protective treatment: Failure to apply protective oil to the threads may lead to rust and corrosion, and about 80% of fatigue failure drilling tools are caused by corrosion due to improper internal maintenance.
· Transportation process: The drilling tool threads are not equipped with protective hoops, which may be damaged due to bumps during transportation.
4. Operation and management:
· Accurate manipulation and handling: The precise manipulation during rock drilling, the excellent coordination between the front and rear tools, and their respective processing accuracy are the fundamental conditions for ensuring the service life of geological drilling rods.
· Drill pipe joint treatment: Drill pipe joints are the weakest link of drill pipes, with over 80% of drill pipe fracture accidents occurring here. The method of overlaying wear-resistant alloy layer on the drill pipe joint is often used to form a wear-resistant belt to protect the drill pipe and casing from wear.
5. Work environment:
· Drilling tools are often exposed to wind and sun, and their composite load effect is strong. The harsh working environment can accelerate the wear and aging of drilling tools.
In summary, the lifespan of drill collars is influenced by multiple factors such as material, repair and maintenance status, maintenance and storage, operation and management, and working environment. In order to extend the service life of drill collars, it is necessary to comprehensively consider these factors and take corresponding measures to improve and optimize them.
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