Abstract
A mathematical model of the cuttings transport with foam in vertical wells has been presented earlier. The model has been incorporated into a computer program and used for optimization of drilling hydraulic parameters (i.e., critical foam flow rate, back pressure, foam quality, etc.) for effective cuttings transport with foam in vertical wells. Effects of key drilling parameters (i.e., drilling rate, annular geometry, formation fluid influx, etc.) on the efficiency of cuttings transport have also been investigated. A series of simplified hole cleaning charts have been developed, which enable the optimum hole cleaning parameters to be determined at the rig site.
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