Non-rotating wellbore casing scraper

摘要

A torque resistant casing scraper for attachment to a drillstring is comprised of a one piece tool body having rotationally unrestrained two-piece blade carriers with hardened diamond-shaped cutting blades and rotationally unrestrained two-piece axial centralizers. Adjoining blade carriers and centralizers rotate independently of the drillstring and the blade carriers interlocked to prevent relative rotation between the blade carriers and to index, or orient the cutting blades as desired along the longitudinal axis of the casing scraper. The diamond-shaped cutting blades and the indexed blade carriers allow both right-handed and left-handed drillstring rotation without reducing utility or effectiveness of the scraper. The casing scraper is particularly effective for deep, near-horizontal wellbores.

主权项

1. A casing scraper, comprising:
(a) a longitudinally extending one-piece tubular body; (b) tubular blade carriers mounted in an array along said tubular body; said blade carriers mounted to rotate freely about the longitudinal axis of said tubular body, independent of rotation of said tubular body about its longitudinal axis; and (c) a plurality of blades extending radially from each said blade carriers, wherein said blades have cutting edges arranged in a symmetrical diamond shape of opposing equal and opposite angles.