Stabilizer-reamer for drilling an oil well

Stabilizing drill collar

Stabilizing tool for well drilling

Surface controlled auxiliary blade stabilizer

Surface controlled blade stabilizer

Technique for drilling straight bore holes in the earth

Tool for forming a hole for a fastening element

Variable diameter drill rod stabilizer

Variable gauge drilling apparatus and method of assembly...

Vertical drilling system for controlling deviation

Wear protective means for a drilling tool

Wear protector for a drilling tool

Wear resistant sleeve for sub assembly

Wear resistant sub assembly

Wear sleeve

Wedge lock stabilizer

Well bore tools

Well tool for use with down-hole drilling apparatus