Patent ID: 8839864
Filing Date: 2014-09-23
Classification: E21B

Abstract:
1. A tool for cutting casings in oil and gas wells, said cutting tool comprising: (a) a cylindrical body adapted for connection to a work string and for insertion into a casing mourned in a well, (b) a first set of cutting blades mounted to said body at first pivot points, said first cutting blades being radially offset from each other about said body and being adapted to extend radially from said body about said first pivot points, said extension of said first cutting blades defining a first sweep diameter; and (c) a second set of cutting blades mounted to said body at second pivot points, said second cutting blades being radially offset from each other about said body and being adapted to extend radially from said body about said second pivot points, said extension of said second cutting blades defining a second sweep diameter; (d) wherein said second sweep diameter is greater than said first sweep diameter and said first pivot points are disposed below said second pivot points at a distance less than the length of a said second cutting blade.