Patent ID: 7121350
Filing Date: 2006-10-17
Classification: E21B

Abstract:
1. An anchor to inhibit rotation of a device relative to an oil well casing, comprising: a tubular mandrel adapted for direct or indirect connection to the device; a cylindrical housing to receive at least a portion of said mandrel concentrically therethrough, said housing being rotatable relative to said mandrel and having a plurality of circumferentially spaced apart apertures formed in an outer surface thereof; a plurality of spaced apart anchoring slips disposed between said housing and said mandrel in registry with respective ones of said apertures in said housing's outer surface; first biassing means associated with said mandrel for rotation therewith in the clockwise and counterclockwise directions to engage and then move respective ones of said anchoring slips radially towards and then into temporarily anchoring contact with the casing to prevent further rotation of said mandrel and the device connected thereto in each of said clockwise and counterclockwise directions; and one or mare drag block means disposed in said housing in registry with respective ones of said apertures in said housing's outer surface to extend radially outwardly therefrom, each of said drag block means being normally biassed into frictional contact with said casing to inhibit rotation of said housing relative to the casing.