Fluctuation of the reservoir bed is the reason why any downhole works should be held in a soft regime. According to our experience the most efficient for these conditions are the following techniques: soft slotted hydro sandblast and hydro mechanical perforation, also the application of foam systems for flushing-out and development of a well and usage of invert-emulsion for well-shutting operation.

A refining way of the operation conditions of the slightly cemented sand layer is a decrease of effective purification capacity on the bottomhole region. The most effective ways of the decrease of capacity in the solid layer are application of damping methods and probe perforation with streams of high pressure.