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lost circulation is becoming a serious problem in today's ongoing drilling
projects, and has a range of consequences. It is very costly for drilling projects operating under lost circulation conditions since excess of drilling mud must be supplied to recover the one lost in the formation. In fact, the question to be asked is “where does that drilling mud lost in the fractured formations go to?” It is possible that while the fluid is being penetrated in the formation, and chemicals present in it can be dissolved in domestic groundwater present. Therefore, drilling companies must take into consideration all those problems while dealing with the thief zone issue.