Oil casing is a large-diameter pipe used to stabilize the walls or boreholes of oil and natural gas wells. The casing is inserted into the borehole and fixed with cement to prevent the borehole from separating rock layers and collapsing, as well as to ensure the circulation of drilling mud, which facilitates drilling and extraction.

The steel grades of oil casing include: H40, J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. The end processing forms of casing include: short round thread, long round thread, offset trapezoidal thread, and special joints. In oil well drilling, casing mainly provides support to the wellbore during drilling and after completion, ensuring the drilling process proceeds smoothly and the entire oil well operates normally after completion. Below is an introduction to the important role of oil casing.

The Importance of Oil Casing

The oil industry extensively uses oil casing, and casing plays a crucial role in the oil industry:

1. Oil casing is used in large quantities and is costly, so there is huge potential for saving expenses and reducing costs. The consumption of well pipes can be estimated based on the number of feet drilled annually. According to the specific situation in China, roughly 62 kg of oil well pipes are needed per meter drilled, including 48 kg of casing, 10 kg of tubing, 3 kg of drill rods, and 0.5 kg of drill collars.

2. The mechanical and environmental performance of oil casing has a significant impact on the oil industry's adoption of advanced techniques and the improvement of productivity and efficiency.

3. The failure of oil casing results in substantial losses; its safety, reliability, and lifespan are critically important to the oil industry.