Multiphase technique improves mud-pulse velocity calculations

The drilling industry employs mud-pulse telemetry worldwide to transmit drilling and formation evaluation data from the bottomhole. Current models consider the drilling mud to be a single phase through which the mud pulses travel. More realistically, however, drilling mud is a multiphase system.Research has demonstrated that mud solids and the free-gas content influence mud-pulse velocity by affecting mud density and compressibility. The authors propose a method to calculate mud-pulse velocity as mud solids and free-gas content change.Generally, mud-pulse velocity declines as mud density increases. Also, the mud-pulse velocity, particularly sensitive to free-gas content, declines as gas c...

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