N80 oil casing is an important equipment used in oil drilling, the main equipment also includes a drill pipe, core pipe and a casing, drilling collar and small caliber drilling pipe etc.. Domestic casing to geological drilling with steel after hot rolling and cold drawing is made, ganghao with "geological" (DZ) said that general casing steel grade have DZ40, dz55, DZ753.

Use

The oil well drilling is mainly used in the drilling process and the support of the shaft lining, in order to ensure the completion of the drilling process and the normal operation of the oil well.

Type

Type and packing of oil casing by SY/T6194-96 "petroleum casing", short thread casing and its coupling and long thread casing and two kinds of connection. In accordance with the provisions of the SY/T6194-96, the domestic casing should be wire or steel tape. The exposed part of the casing and the connecting thread of the casing shall be screwed on the protective ring in order to protect the thread.

Specifications

According to SY/T6194-96 regulations, the casing length is not constant, and the range of 8-13m. But not less than 6m of the casing can be provided, the number of not more than 20%.

Appearance

The casing inside and outside surface shall not have folded, crack, crack, delamination, rolling reduction and scarring. These defects should be completely removed, and the depth of the clearance shall not exceed 12.5% of the nominal wall thickness.

Quality

Bushing and a connecting hoop thread surface should be smooth, not allowed to burr, tear and enough to make the thread strength and disruption of tight junctions of other defects.