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обрушивание породы в скважину stresses
O&G	drilling hole wall sloughing (MichaelBurov); sloughing (MichaelBurov); sloughing of walls (MichaelBurov); sluffing (MichaelBurov); wall sloughing (MichaelBurov); wall sluffing (MichaelBurov); borehole caving (MichaelBurov); borehole sloughing (MichaelBurov); borehole breakouts (MichaelBurov)
oil	borehole caving (MichaelBurov); borehole sloughing (MichaelBurov); borehole breakouts (MichaelBurov)