J55 steel pipe - oil casing

J55 steel pipe-oil casing is an important equipment for oil drilling. Its main equipment also includes drill pipe, core pipe and casing, drill collar and steel pipe for small-diameter drilling.

The domestic casing is made of steel for geological drilling through hot rolling or cold drawing, and the steel grade is represented by "geological" (DZ).

Standards mostly refer to American Petroleum Institute standards API5A, 5AX, 5AC.

According to the American Petroleum Institute standard APISPEC5CT, casing steel grades H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110, Q- 125 total 10 kinds.

Casing shall be supplied with threads and couplings, or with one of the following pipe ends: plain end, round thread without coupling or with coupling, buttress thread with or without coupling, direct connection Type thread, special end processing, sealing ring structure.

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