? ? ? ? ? ? Seamless Casing Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or wellbore, 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.Type of casing used:Surface casing& Intermediate casing& Production casing (oil string). Size of casing varifies from 4-1/2”to 20”,part of our specifications as below:

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? ?? ERW Casing ERW casing is widely used as it has better performance in precise size, collapse,explosion ability and low prices than seamless casing. Our cooperative factory adopts the first-class production line in China,which is able to manufacture N80 grade steel casing,by introducing the rolling mill and flying cut-off of Nakata Mfg.Co.,Ltd.(Japan),high-advanced FF-X forming technology in the world,easy to operate,can be precisely digital-controlled to ensure the stability and precision of forming the products with excellent quality.Size of casing varifies from 5-1/2 to 13-3/8, specifications as below: ?

Outside?Diameter in	Nominal?Weight ?lb/ft	Wall?Thickness in.	Steel?Grade	Type?of?end-finish
5-1/2	14	0.244	J55/K55	PS
	15.5	0.275	J55/K55	PSLB
	17	0.304	J55/K55	PSLB
6-5/8	24	0.352	J55/K55	PSLB
7	20	0.272	J55/K55	PS
	23	0.317	J55/K55	PSLB
	26	0.362	J55/K55	PSLB
8-5/8	24	0.264	J55/K55	PS
	28	0.304	J55/K55	PS
	32	0.352	J55/K55	PSLB
	36	0.4	J55/K55	PSLB
9-5/8	36	0.352	J55/K55	PSLB
	40	0.395	J55/K55	PSLB
10-3/4	40.5	0.35	J55/K55	PSB
	45.5	0.4	J55/K55	PSB
13-3/8	48	0.33	J55/K55	PSB
	54.5	0.38	J55/K55	PSB
	61	0.43	J55/K55	PSB
	68	0.48	J55/K55	PSB
?P?-?plain?end,?S?-?short?round?thread,?B?-?butress,?L?-?long?round?thread.

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? Seamless casing
??? ERW casing

??????????????????????????? You?will?never?regret?choosing?us