EQUIPMENT AND METHODS FOR DETERMINING WAITING-ON-CEMENT TIME IN A SUBTERRENEAN WELL

摘要

Improved equipment and methods for determining the waiting-on-cement time after a cementing operation involve an optic-fiber coil that immersed in the cement slurry downhole. The intensity of a reflected light signal from the coil is monitored versus time. Attenuation of the reflected-light intensity corresponds to the development of gel strength, allowing operators to unambiguously determine when well-bore operations may recommence after a cement job. The optic-fibre coil is wound around a spool such that there is at least one coil crossing on the spool.