Designation 0f Drilling Mud in Pabdeh and Gurpi Formations for Avoidance from Variation of Shaly’s Parts of These Formations

In this paper Pabdeh and Gurpi’s formations that the most parts of them are Shaly, will be under discussion and debating. Clay mineral of theseformations will be completely expanded andexplained and by this base the designation of the mud that avoiding from their variation will be discussed. Several ways discussed for optimum designation of mud for create the least problem such as, increase of salt, decrease in temperature and use of KOH andKCL and even limestone .In each case limitation and benefits that this material has in response to clay mineral these formations will be completely analyzed