N80 oil casing is an important equipment for oil drilling equipment, which mainly include drilling pipe, tube and casing, drill collar and small diameter drilling pipe etc.. Domestic casing to geological drilling with steel after hot rolling or cold drawn steel made by "geological" (DZ) said that the steel grade are commonly used DZ40, DZ55, DZ753.
purpose
It is mainly used in the drilling of oil wells, which is used to support the well wall during drilling and completion.
type
Types of oil casing and packaging according to SY/T6194-96 "oil casing" short thread casing and its coupling and long threaded casing and its two kinds of coupling. According to SY/T6194-96, the domestic casing shall be made of steel wire or steel tape. The exposed part of each casing and the connecting rod screw shall be screwed on the protection ring to protect the thread.
Specifications
According to the regulations of SY/T6194-96, the casing length is not fixed, and the range is 8-13m. But not less than 6m of the casing can be provided, the number shall not exceed 20%.
Appearance
The inner and outer surfaces of the casing shall not be folded, hairline, separated, cracked, rolled and scarred. These defects shall be removed completely, and the clearance shall not exceed 12.5% of the nominal wall thickness.
quality
The surface of casing and coupling thread shall be smooth without burr, tear and other defects which are sufficient to cause the thread to break down the strength and tight connection.