Patent ID: 9228400
Filing Date: 2016-01-05
CPC Classification: E21B,F15D

Claim Text:
1. An apparatus comprising: a tubular having an exterior surface; an elongated member disposed on the exterior surface, wherein a first end of the elongated member is attached to the tubular at a first position and a second end of the elongated member is attached to the tubular at a second position spaced axially away from the first position, and wherein the first end is angularly offset from the second end, such that the elongated member forms at least part of a helix around at least a portion of the tubular; and a plurality of blade members extending radially away from the elongated member and the tubular, wherein the blade members are adapted to induce turbulence in a fluid flowing across the exterior surface of the tubular, wherein the plurality of blade members are rotatable with respect to the elongated member at least when the elongated member is attached to the tubular, and wherein the plurality of blade members are rotatable such that an area of the plurality of blade members that obstructs the flow of fluid across the exterior surface of the tubular is adjustable.