DRILLING HYDRAULICS ANNULAR REYNOLDS SERIES

10.5 Cuttings Transport in Deviated Wells.

10.4 Five Percent Maximum Concentration Model for Vertical Wells.

10.3 Carrying Capacity of a Drilling Fluid for Vertical Wells.

9.2 Governing Equations-Dynamic Pressure Prediction.5 General Steady Flow Wellbore Pressure Solutions.2 Key Considerations for Wellbore Hydraulic Simulation.

DRILLING HYDRAULICS ANNULAR REYNOLDS SERIES

Steady-state surge pressure prediction.įollowing these basic problems, a series of special topics are presented:.These problems are considered in the following order: Next, each specific wellbore flow problem is examined in detail, starting from the simplest and progressing to the most complicated. This chapter first presents a general overview of one-dimensional (1D) fluid flow so that the common features of all these problems can be studied. Fluid mechanics problems range from the simplicity of a static fluid to the complexity of dynamic surge pressures associated with running pipe or casing into the hole. The purpose of this chapter is to describe in detail the calculations necessary to predict the flow performance of various drilling fluids for the variety of operations used in drilling and completing a well.ĭrilling fluids range from relatively incompressible fluids, such as water and brines, to very compressible fluids, such as air and foam. To properly engineer a drilling fluid system, it is necessary to be able to predict pressures and flows of fluids in the wellbore. It is clear that accurate wellbore pressure prediction is necessary. If the wellbore pressure falls below the pore pressure, fluids will flow into the wellbore, perhaps causing a blowout. For example, if the wellbore pressure exceeds the fracture pressure, fluids will be lost to the formation. Weight of Pipe Contents: Computes the weight (mass) based on density and pipe dimensions.The three primary functions of a drilling fluid-the transport of cuttings out of the wellbore, prevention of fluid influx, and the maintenance of wellbore stability-depend on the flow of drilling fluids and the pressures associated with that flow.Volume of a Pipe: Computes the volume of a pipe.Mud Buoyancy: Computes the buoyancy in mud.Quintuplex Pump Output: Barrels per stroke from a quintuplex pump.Triplex Pump Output: Barrels per stroke from a triplex pump.Duplex Pump Output: Barrels per stroke from a duplex pump.Annular Velocity: Compute the fluid flow velocity, based on the flow rate and pipe dimensions.Barrel Production: Computes the total volume (barrels) produced over a period of time based on the production rate and duration.The formula for the Annular Velocity is :

meters per second) via the pull-down menu. However, this can be automatically converted to other velocity units (e.g.

( Dp) Outer diameter of the drill pipe.Īnnular Velocity (AV): The calculator returns the fluid velocity in feet per minute.

( Dh) Size of the hole, the inner diameter.

( Q) Pump output which is the flow rate of the pump.

INSTRUCTIONS: Choose units and enter the following: The Annular Velocity calculator computes the speed of a fluid's movement in an annulus while pumping based on the pump output ( PO), the inner diameter of the pipe ( ID), and the outer diameters of the drill pipe ( OD)

Drilling hydraulics annular reynolds