Patent ID: 8336645
Filing Date: 2012-12-25
Classification: E21B

Abstract:
1. A rotating drill string sub to redistribute wellbore drill cuttings into the drilling fluid flowstream, comprising: an agitator, having a plurality of alternating blades standing radially outward from the axis of said sub and arranged helically about the axis of said sub, and having a plurality of alternating grooves, each groove located between a pair of adjacent said blades, and each groove comprising a flow channel that is open at both ends of said agitator; at least two standoff elements each containing abutment surfaces, one standoff element spaced on each side of said agitator, and each standoff element connected to said agitator by a section of drill pipe, each standoff element comprising: wherein the helical blades in at least one of the at least two standoff elements are arranged such that at one end of said blades, said blades are arranged in a left-hand wrap orientation, while at the other end of said blades, said blades are arranged in a right-hand wrap orientation.