Multiple stage mechanical drift tool

Details Multiple stage mechanical drift tool Multiple stage mechanical drift tool

2009-04-17

2011-11-22

Smith, R. A. (Department: 2841)

Geometrical instruments

Gauge

Internal

C033S544400

Reexamination Certificate

active

08061053

ABSTRACT:
A downhole tool for measuring a diameter of a borehole that includes a mandrel and a collet is disclosed. The collet is disposed about the mandrel that includes a tapered surface formed on an outside surface of the mandrel that increases in diameter across a portion of the mandrel. The collet includes deflectable arm portions with a borehole engagement portion that are adapted to engage the borehole. The borehole engagement portions in-turn may then engage the tapered surface or the steps of the mandrel, such that the collet can move with respect to the mandrel. With this movement of the collet, the outer diameter of the collet may progressively decrease, thereby also decreasing the outer diameter of the downhole tool.

REFERENCES:
patent: 953282 (1910-03-01), Nash
patent: 2925660 (1960-02-01), Raulins
patent: 3349610 (1967-10-01), Georges
patent: 6283208 (2001-09-01), George et al.
patent: 04313003 (1992-11-01), None
Derwent 2002-348536 abstract of KR 2001064958 A, titled “Variable mandrel for measuring inner diameter”, published Jul. 11, 2001, Inventor: Kang et al., Assignee: Korea Telecom [KTKT].

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