Well stability is considered as an important extraction condition.in this study,A failure to solve some of the problems.drilling a wee wall is one of the most important thing to access the oil reservoirs.One of these,instability of rocks which causes the wall to fall well.tensions have a great influence on the rocks which can be considered as one of the causes of instability in the well wall.Another problem of drilling is the presence of chilean and sandy layers,in such a way that chilean layers prevent the extraction of hydrocarbon reservoirs by placing an oil reserves.In this discussion,these problems have been addressed and some solutions have been presented.