Page 210 - Air and Gas Drilling Manual

5-52 Air and Gas Drilling Manual
67 5 .
=
q
= 99 . gal/hr
f
(.
)( .
0 8156 8 33)

Figure 5-12: Drill string injection pressure (same as compressor output pressure) for
Illustrative Example 5.2c.
Using the data in Figure 5-12 and similar calculations as those given above, the
diesel fuel consumption rate as a function of drilling time (or drilling depth) can be
obtained. Figure 5-13 shows the diesel fuel consumption rate as a function of
drilling time for this reciprocating piston compressor. The approximate total diesel
fuel needed by the compressor to drill the borehole is obtained by the integration of
the area under the curve in Figure 5-13. This is approximately 275 gallons. It is
standard practice to assume a 20 percent additional volume of fuel for blowing the
hole between connections and other operations on the drill rig. Therefore, the
approximate total diesel fuel needed for this compressor at the drilling location is
330 gallons.