TABLE OF CONTENTS This program calculates the required gas injection volumetric flow rate in order to obtain a bottom hole annulus pressure of 2317 N/cm 2 guage while drilling at 3048 m of depth. Assumes homogeneous multiphase flow.
| q a := 595.5 | air volumetric flow rate trial and error value (actual liters/sec) |
| q f := 722.9 | mud flow rate (Ipm) |
| ? f := 11.772 | specific weight of mud (N/liter) |
| ? air := 0.012 | viscosity of air (centipoises) |
| ? mud := 30 | viscosity of mud (centipoises) |
| | aerated fluid flow loss coefficient through nozzles |
| D c := 2133.8 | total depth of cased hole (m) |
| D oh := 914.4 | total length of open hole (m) |
| alt := 1219.1 | elevation of drilling site (m) |
| p 0 := 8.749 | pressure from table for elevation (N/cm 2 abs) |
| t 0 := 15.6 | temperature from table for elev. ( C) |
| P at := 8.749 | actual surface pressure (N/cm 2 abs) |
| t at := 15.6 | actual given atmospheric surface temperature ( C) |
| ROP := 18.3 | estimated rate of penetration (m/hr) |
| d bh := 200.03 | borehole (drill bit) diameter (mm) |
| od dc := 158.75 | outer diameter of drill collar (mm) |
| id dc := 71.438 | inner diameter of drill collar (mm) |
| od dp := 114.30 | outer diameter of drill pipe (mm) |
| id dp := 97.18 | inner diameter of drill pipe (mm) |
| od tj |
