Patent · US Active

Wall contact caliper instruments for use in a drill string

US8484858B2 · kind B2 · utility

38Cited by

25References

18Claims

0Family size

Assignee

SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

James C. Brannigan · Cypress, US
Raymond V. Nold, III · Beasley, US
John Rasmus · Richmond, US
Fernando Garcia-Osuna · Sugar Land, US
Alexander F. Zazovsky · Houston, US

Key dates

Filing date	Mar 7, 2011
Grant date	Jul 16, 2013
Priority date	—
Expiry date	Oct 19, 2031

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B47/08
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A drill string caliper includes a mandrel configured to be coupled within a drill string. At least one laterally extensible arm is coupled to an exterior of the mandrel. A biasing device is configured to urge the at least one arm into contact with a wall of a wellbore. A sensor is configured to generate an output signal corresponding to a lateral extent of the at least one arm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.