Liner movement results in substantial improvements in cementing performance, principally by assisting mud displacement efficiencies. Rotation is more effective and safer than reciprocation. A number of plain (Astro) and taper roller bearings from different manufacturers were tested in a laboratory program. None of the bearings tested satisfied the original performance target of 24 hours life at a bearing load of 112,000 lbs and speed of rotation of 25 RPM. Taper roller bearings were found to give better performance than Astro bearings. One design of taper roller bearing performed sufficiently well to satisfy most cementing jobs and would be selected for future use. It was thought, however, that all the bearings tested could be improved by better sealing and structural design. Documented field applications of liner rotation are discussed and found to be consistent with the test results in general.

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