Drilling of deep and ultra-deep wells for prospecting and exploration of new raw mineral fields

Scientific and technological progress over the last century has led to an enormous increase in consumption of minerals, including energy resources. Most exploited oil gas fields are already considerably depleted, so it is necessary search for new hydrocarbon resources, particularly at great depths. Deep drilling plays a special role solving this problem. The article considers world Russian experience ultra-deep wells drilling. me-thods technologies used construction wells, as well complications accidents occurring during their were analyzed. analysis revealed that existing limitations parameters deep caused by technical characteristics surface bottomhole equipment, which do not meet extreme conditions. directions development machinery suggested. notion rock geological conditions introduced, describes hydrostatic pressure flushing fluid column high temperature both stable unstable wellbore conditions, coming close upper limit operating assembly, drill string fluid.