... wide fractures is impossible in many cases, which results in severe safety issues associated with toxic gases. This study investigates an application of mud cap drilling by injecting foam mixture into the annulus for well control in such harsh conditions. An annular fluid column with foam mixture can...

... Abstract A closed form and easy-to-use analytical model has been developed in this study for foam hydraulics. The analytical model fully couples the frictional and hydrostatic pressure components in vertical and inclined boreholes. The newly developed model together with screened rheological...

... shown in Figs. 2 and 3 , the following considerations were taken into account. Drilling fluids are in general selected according to their ability to clean the well, prevent downhole fires, and ability to carry produced fluids to the surface. For instance, stiff foams are preferred over unstiffened...