The production of casing pipes in an oil casing plant involves several critical steps to ensure the final product meets the required specifications and quality standards. Here is an overview of the process of casing pipe in plant.
Steel Ingot Heating:
Using a ∮216mm periodic tube rolling mill with a ring furnace.
The ∮318mm periodic tube rolling mill originally designed with two ring furnaces.
Hydraulic Punching:
For ∮216mm, a 10kN hydraulic press is used for punching.
For ∮318mm, an 18kN hydraulic press is employed for punching.
Extension:
Utilizes a two-roller guide extension machine.
Reheating:
Conducted with a tray furnace, using a rolling mill cycle, then transferring the pipe without reheating into the furnace.
Periodic Rolling:
Uses periodic rolling mills at different stages of production.
Sizing:
Employs a two-roll 5-rack sizing machine.
Cooling:
The cooling bed is a one-way chain-type cooling bed.
For the ∮216mm cycle rolling unit, product specifications are ∮114.3 ~ 319mm with a wall thickness of 6 ~ 40mm.
For the ∮318mm cycle rolling unit, product specifications are ∮168 ~ 377mm with a wall thickness of 6 ~ 40mm.
This step produces various casing pipes and some drill pipes.
Straightening:
Pipes are straightened to meet quality standards.
Pipe Cutting:
Pipes are cut to the desired lengths.
Inspection:
Final inspection is performed to ensure the pipes meet all specifications and quality standards.
Precision Pipe Rolling Unit Introduction
In 1994, to improve the quality of casing pipes, the factory introduced a precision pipe rolling unit of ∮180mm, jointly designed by China and the United States. This included introducing technology, joint design, and joint manufacturing equipment. The process involves:
Continuous Casting:
Using a continuous casting round tube.
Heating:
Heated with a ring furnace.
Perforation:
Conducted using cone roller piercing.
Precision Rolling:
Rolling is done with a precision rolling mill.
Sizing:
Employs a 12-rack three-roll micro-tension sizing machine.
Cooling:
Cooled on a cooling bed.
This established the world's only set of seamless steel pipe short-flow production lines, comprising the following steps:
Electric Arc Furnace (EAF)
Furnace Refining
Vacuum Degassing
Continuous Casting
Heat Transfer
Tube Heating
Perforation
Pipe Rolling
Sizing
Cooling
Tempering (reserved)
Online Quenching (reserved)
Tempering (reserved)
Sizing (reserved)
Cooling
Straightening
Flaw Detection
Sawing
Cutting Head
Inspection
Rail Straight Pipe Machining
Through these steps, the casing pipe plant ensures the production of high-quality seamless steel pipes suitable for various applications.
