Tool joint bench mark

Details Tool joint bench mark Tool joint bench mark

1981-02-27

1984-03-27

Arola, Dave W.

Pipe joints or couplings

With indicator, alarm or inspection means

285333, 72367, F16L 3500

Patent

active

044389531

ABSTRACT:
Drill pipe for an oil and gas well drill string has a better bench mark system for determining when the tool joints of the drill pipe are no longer satisfactory for sealing. The bench mark is an edge formed in the tool joint in the space between the threads and the make-up shoulder of the tool joint. The edge extends around the circumference of the tool joint for serving as a reference line to measure the distance from the reference line to the make-up shoulder. On the pin type tool joint, the bench mark edge is formed by forming a cylindrical surface in the tapered surface normally located between the threads and make-up shoulder. In the box type tool joint, the bench mark edge is formed by forming a cylindrical surface in the normal tapered surface to create a bench mark shoulder inward from the make-up shoulder.

REFERENCES:
patent: 1942518 (1934-01-01), Protin
patent: 3822902 (1974-07-01), Maurer
patent: 4317585 (1982-03-01), Boile
As 207--Hughes Tool Company--Apr. 1, 1976.

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