steel tube

    N80 petroleum casing pipe is a kind of important equipment for petroleum drilling. Its main equipment also includes drill pipe, core pipe and casing, drill collar and steel pipe for small diameter drilling. The meaning of N80 is the steel pipe grade divided according to the strength of the steel itself, and other steel grades such as J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Domestic casing is made of hot-rolled or cold-drawn steel for geological drilling. The steel number is represented by "Geology" (DZ). The commonly used casing steel grades are DZ40, DZ55, DZ753 species. Used in oil well drilling, it is mainly used to support the well wall during the drilling process and after completion, so as to ensure the progress of the drilling process and the normal operation of the entire oil well after completion.

    Installation requirements for threaded insulation joints for petroleum casing     1. Within 50 meters of the installation place of the insulation joint, avoid the dead mouth to be welded.     2. After the insulated joint is connected to the pipeline, it is not allowed to lift the pipeline within 5 meters of the joint. The pressure must be tested together with the pipeline.     3. After the insulation joint is connected to the pipeline, it should be repaired as required, and the surface temperature of the insulation joint should not be higher than 120 ° C during anticorrosion work.     4. When installing the insulation joint, it should be installed on both ends of the joint on the straight pipe section 20 meters away from the elbow and set up a bracket. When installing in the ground, avoid installing it in perennial water accumulation.     5. The center wheelbase of the joint shall be installed on the same straight...