The production method of high-strength petroleum casing (above N80Q grade) is generally completed by steelmaking, rolling, quenching and tempering, and pipe processing. During the production process, the outer diameter of the tube blank is controlled during the processing of the wire. The requirements are high, and the shape of the outer diameter of the pipe blank after quenching and tempering changes (mainly becoming oval). When the pipe processing wire unit has no special pipe end sizing equipment, the quenched and tempered pipe is used. Billet, full-length low-temperature (510 ～ 610 ℃) sizing process to ensure the dimensional accuracy requirements of the outer diameter of the tube billet is a practical production organization.
According to the requirements of API Spec 5CT "Specifications for Casings and Tubing", the control range of the outer diameter of the pipe blank for pipe processing wire is D: j 5%. Due to the different production units and production processes selected by various manufacturers, their The control range of the tube blank of the high-strength petroleum casing pipe used for pipe processing wire is different. In the production practice process, the accuracy of the full-length outer diameter of the wire blank for the wire is better controlled in the 95% range, the roundness of the pipe body is improved, the positioning accuracy of the pipe end of the wire machine is improved, and the pipe is The cutting amount in the circumferential direction is consistent, and the phenomenon of black skin on the pipe end after the wire is greatly reduced.
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