Centralizer for wireline tools

Details Centralizer for wireline tools Centralizer for wireline tools

2006-08-15

2006-08-15

Gay, Jennifer H. (Department: 3672)

Wells

Guide for device or conduit

For a wireline operation

C166S214000, C175S325300

Reexamination Certificate

active

07090007

ABSTRACT:
A centralizer for use in oil well wireline toolstrings comprising a central mounting rod and floating spring mechanisms between which a number of jointed centralizer arms are connected. The jointed centralizer arms have a section with a concave profile disposed near to their pivot points so that a closing force acting on the arms acts at a greater distance from the pivot, thereby increasing the closing moment and making the centralizer easier to draw into a borehole with a narrow cross-section. The floating spring mechanisms also have a linkage to the presser plate of the spring such that an axial force pulling the centralizer apparatus into a borehole is transferred directly into a force on the spring, thereby reducing the opening moment the springs exert on the centralizer arms.

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