API spec 5ct P110 Casing Tube
For drilling oil wells
Oil casing is an important equipment for oil drilling. Its main equipment also includes drill pipe, core pipe and casing, drill collar and small diameter drilling pipe. The domestic casing is made of hot rolled or cold drawn steel for geological drilling, and the steel number is expressed as "geological" (DZ).The used casing steel grade has DZ40,DZ55,DZ753 species. And Weight
Use：For drilling oil wells
Kind：According to SY/T6194-96 oil casing, there are two kinds of short thread casing and its coupling and long thread casing and its coupling.
Specification and appearance quality
The main results are as follows: (1) according to SY/T6194-96, the length of domestic casing is not fixed, and its range is 8-13 m. However, not less than 6 m of casing can be provided, its number shall not exceed 20.
(2) the inner and outer surfaces of the casing shall not be folded, striated, separated, cracked, flattened and scarred. These defects should be completely removed, and the depth of removal shall not exceed the nominal wall thickness of 12.5.
(3) the outer surface of the coupling shall not have such defects as folding, hairline, layer separation, crack, rolling, scarring and so on.
(4) the surface of the casing and hoop thread shall be smooth and shall not allow burr, tear and other defects sufficient to affect the strength and tight connection of the thread.
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