Manufacturing process of tubing and casing

Definition and functions of tubing and casing

Tubing and casing are two types of pipe materials widely used in the petroleum industry. Their main function is to transport underground resources such as oil or natural gas in oil wells.

Tubing are pipelines that transport crude oil and natural gas from oil and gas layers to the surface after drilling. They are used to withstand the pressure generated during the mining process. They are usually seamless steel pipes with high strength and corrosion resistance. Its main role in oil wells is to support the well body and transport underground resources.Tubing is a long tubular equipment made of high-strength steel plates through multiple processes such as hot rolling, cold drawing, temperature control, and hydrogen removal. The most critical processes are hot rolling and cold drawing. Hot rolling refers to a process in which high-strength steel plates are pressed and formed by large-scale rolling mills under high-temperature conditions. Subsequently, a cold drawing process is used to enhance the strength and toughness of the tubing. The manufacturing process of tubing also includes multiple processes such as temperature control, pickling, and hydrogen removal to ensure the quality and performance of oil pipe products.

Casing is a pipe that covers the outside of the oil pipe and is also a way to transport underground resources through the wellhead. The casing is usually made of welded steel plates and is made through multiple processes. Its function is to prevent the well wall from collapsing and filtering water, and at the same time, it supports the oil pipe.

Differences in manufacturing processes of tubing and casing

1.Material selection

Tubing generally use seamless steel pipes or welded steel pipes, mainly considering their high strength, good corrosion resistance and stability. The casing is generally made of thicker steel plates, which are composited through multiple processes, taking into account its compressive strength.

2.Production process

The production process of tubing is relatively simple, generally using processes such as hot rolling and cold drawing. The manufacture of seamless steel pipes requires multiple processes such as continuous casting, rolling, and perforation. The production of casing is more complicated and requires multiple processes such as cutting, blanking, and pre-bending, which increases the difficulty and cost of production.

3.Quality control

Quality control is also different for tubing and casing. Tubing generally require chemical composition analysis, mechanical property testing and fine structural inspection. The casing needs to be quality inspected in many aspects such as thickness, bending, and welded joints.
 

Summary

Tubing and casing are two indispensable and important parts in the petroleum industry, and their manufacturing processes are also different. The manufacturing of oil pipes is relatively simple, mainly considering its high strength and corrosion resistance; while the manufacturing of casing is more complicated, and its compressive strength and various quality inspections need to be taken into consideration. Understanding the manufacturing process of tubing and casing is especially important for those working in the petroleum industry.