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. 2)Irregularities of the circulating system.ĭrilling mud leaves the pump discharge, passes through the surface lines, standpipe, and mud hose, and finally enters the drill string at the top of the kelly joint.1)Mud flow property peculiarities, as discussed in Chapter 6.The standard hydraulics approach to such analyses is hindered by numerous factors, among which are: Analytical appraisal of the rig's circulating system requires an understanding of the components which consume power, so that the available energy may be used as advantageously as possible. Proper utilization of mud pump horsepower is of considerable importance to rotary drilling operations.
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