The casing string in the hole drilling, used to prevent the formation of formation fluid flow and collapse.
The tubing string into the production casing, components of underground reservoir and the ground channel, control of crude oil and natural gas flow.
The Product Standard: API SPEC 5CT9thPSL1; PSL2; PSL3;
Size:1"9~13-3/8"
Grade:H40,J55,K55,N80,L80,R95(C95),T95,P110,Q125
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