Oil special pipe is mainly used in oil, gas well drilling and oil, gas transport. It includes oil drill pipe, oil casing, tubing. Oil drill pipe is mainly used to connect drill collars and drill bits and transfer drilling power. Oil casing is mainly used in the drilling process and after completion of the wall support to ensure that the drilling process and completion of the entire well after the normal operation.
The oil and gas on the bottom of the oil well are transported to the ground by the pumping pipe. Oil casing is the lifeline to keep the oil well running. Due to the different geological conditions, the stress state of the downhole is complex, the combined action of tension, pressure, bending and torsion stresses on the tube body, which puts forward a higher requirement for the quality of the casing itself.
Once the casing itself is damaged for some reason, it may result in the production of the whole well, or even scrap it. According to the strength of steel itself casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150 and so on. Causing, well deep different, the use of steel grades are also different. In the corrosive environment, the casing itself is required to have anti-corrosive properties.
In the complex geological conditions, the casing is also required to have anti-collapse performance.
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