Patent ID: 6439304
Filing Date: 2002-08-27
Classification: E21B

Abstract:
A stand-off device for use in a wellbore comprising an inner tubular and an outer tubular to prevent said inner tubular from contacting the side of a wellbore or the side of said outer tubular whereby an annulus is formed between said inner tubular and the side of the wellbore or the outer tubular, said tubular being operable for containing and transmitting fluid flow in a first direction such that fluid flow in an opposite direction occurs through the annulus for circulating fluid within the wellbore, the stand-off device comprising:a sleeve adapted to fit around said first tubular, the sleeve having an outer surface; and blades extending along the outer surface of the sleeve so as to be positioned within the annulus, wherein each blade has a bearing surface, and wherein each bearing surface is curved longitudinally with respect to an axis of the sleeve, wherein the stand-off device is made of a suitable first material, and wherein the bearing surface is made of a second suitable material different from the first suitable material.