The tubes always have different usages ,such as for conveying gas, water, and oil in both and natural gas industries etc.Now I will introduce two kinds tubes which are used commonly in the oil industry.
The first one is casing. Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or well bore. It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take place. Steel Casing Pipes have smooth wall & minimum yield strength of 35,000 psi.The second one is tubing. Tubing is a kind of pipe used for the transportation of oil and natural gas from an oil or gas layer to the surface after drilling is completed. It is made to withstand the pressure generated from the extraction process. API steel tubing is manufactured in the same way as casing, except that an additional process known as “upsetting” is applied to thicken the pipes.
The quality standards of the tubing pipe are shown as below:
SY/T 6194 Petroleum and natural gas industries
API 5CT CASING AND TUBING
BS EN ISO 11960 Petroleum and natural gas industries
NF M87-207 Petroleum and natural gas industries