psl2 x52 x56 x60 x65 x70 x80 hfw hfi erw line pipe

psl2 x52 x56 x60 x65 x70 x80 hfw hfi erw line pipe

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Ministry of Commerce of the P.R.China China Commodity Net

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.

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