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The determination of circulating pressure is critical to the analysis of rotary drilling operations. Without knowledge of the actual pressures occurring in the system, it is sometimes difficult to prevent a gas kick or fractured formation. Rotary drilling hydraulics is concerned with a determination of these pressures and thus, is a very important part of drilling engineering. The most important phase of rotary drilling hydraulics is the calculation of the frictional pressure losses during mud circulation through the system. It is commonly known that formation temperatures increase with depth -- normally one to two degrees per hundred feet. The frictional pressure losses depend upon the mud's flow properties which are pressure losses depend upon the mud's flow properties which are a function of temperature. So, the pressure losses in both the drill pipe and annulus vary just as the temperature does.
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