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Internal drift inspection of casing and tubing
- May 07, 2018 -

When oil casing and tubing fixing in the oil well, the inner hole should be into a number of downhole tools, and to be able to pass once again drilled drill bit. For fixing and the next drilling to proceed smoothly, the standard requires full length drift inspection of the oil casing. 

The drift test is divided into: standard size and replacement diameter. 

The standard gauge size is shown in follow: 

<95/8              152          d-3.18 

≥95/8~133/8       305          d-3.97 

>133/8             305          d-4.76 

Note: d--pipe diameter. 

Because the replacement diameter is only part of the thickness of the part of the specification, the table does not list the replacement size of the diameter gauge.