![]() ![]() Calculation of pressure drop for pipe flow requires a knowledge of which flow pattern pertains to the specific case, since different equations apply for each situation. In turbulent flow, secondary irregularities and eddys are imposed on the main or average flow pattern. In laminar (viscous) flow the fluid moves in parallel layers or laminae which are at all times parallel to the direction of flow. ![]() 7.2 Newtonian Fluid Flow Calculationsįluid flow through pipes is considered as either laminar or turbulent. However, with a little practice and understanding the task is not particularly formidable.īefore discussing plastic fluid flow calculations let us first review the fundamental equations of Newtonian fluid flow. The solution to Equation (7.1) is rather tedious, in that separate calculations for each section are required. = pressure loss in annulus around drill pipe ![]() = pressure loss across bit water courses or = pressure loss in surface piping, standpipe, Hence the discharge pressure at the pump is defined by: Since the mud enters the drill string and leaves the annulus at essentially the same elevation, the only pressure required is that necessary to overcome the frictional losses in the system. Here it begins the long downward travel through the drill pipe and drill collars, is expelled through the water courses or nozzles of the bit, and returns up the annulus?: The annular area is relatively small around the drill collars and becomes larger in the portion containing drill pipe.
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