Drill collars are an important part of the drill string during oil drilling. Drill collars are located in the lower part of the drill string and are connected to the drill bit. In addition to transmitting torque, the weight on bit is also stroked to allow the bit to penetrate. During use, the drill collar is subject to environmental stress corrosion and alternating bending fatigue stress are the main factors causing failure and damage. In recent years, due to the continuous occurrence of fracture events of oil drill collars, it has attracted great attention from relevant parties.
Petroleum casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. Casing can be divided into: conduit, surface casing, technical casing and oil layer casing according to the usage.
United Steel Industry Co.,Ltd In order to ensure product quality, the production process of oil and casing is strictly controlled, and each oil and casing must go through the process of factory inspection
api ct petroleum tubing and casing Dimensions & Specificaitons
Description: tubing
Standard: APISPEC5CT, APISPEC5B, ISO11960
Uses: Tubing is used to extract oil or natural gas from oil wells.
Description: Oil Casing
Standard: APISPEC5CT, APISPEC5B, ISO11960
According to SY/T6194-96 "Petroleum casing", it is divided into two types: short threaded casing and its coupling, and long threaded casing and its coupling.
Oil casing with special threads is mainly used in wells where traditional API threads are not suitable. Traditional API threads have problems such as sealing and tensile strength. Traditional API threads have poor gas sealing performance. For wells containing hydrogen sulfide, carbon dioxide and chloride ions It is not suitable for wells in different positions, and special threads can effectively overcome these shortcomings. In addition, some high-grade steel pipes (such as Q125 and above steel grades) generally use special threads.
Boiler tube is a kind of seamless steel tube. Boiler tube refers to a steel material with openings at both ends and a hollow section. The ratio of its length to the surrounding area is large. Dimensions (such as outer diameter or side length) and wall thickness indicate that there is a wide range of sizes, from small diameter capillaries to large diameter tubes with diameters of several meters. Steel pipes can be used in pipelines, thermal equipment, machinery industry, petroleum geological exploration, containers, chemical industry and special purposes.
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