Abstract
The production stage of oil and gas wells is drilled by using drilling mud with a sufficient density which achieves pressure exceeding the formation pressure in about (5-12%) for preventing blowouts. When circulation of drilling fluid is stopping the drilling fluid must have gelling characteristics which will prevent drill cuttings from settling down over the bit . At the reason of increasing the gel strength, a part of clay suspense is placed on well walls. This matter leads to decrease the density of mud, consequently, formation pressure is to be become more the hydrostatic pressure of drilling mud which allows the formation fluids to blow out of the well.
Studying the factors affecting the hydrostatic pressure of drilling mud enables controlling the time, required for decreasing hydrostatic pressure of drilling mud to values of formation pressure ( balanced time ), then the production stage will be drilled without problems .
In This research we will study the effect of The Temperature and the mud properties(Chloride content ,solid content)of well model on the balanced time of the mud column
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