Page 557 - Air and Gas Drilling Manual

10-82 Air and Gas Drilling Manual
Illustrative Examples 10-2 and 10-3 demonstrate the calculation procedures (step
Nos. 1 to 10 given in Section 10.1) that can be used to plan a typical deep oil or
natural gas well drilling operation.

Figure 10-8: Fuel consumption rate as a function of drilling time for compressor used in
Illustrative Example 10.2 (q g = 1,500 acfm from the compressor).
10.6 Field Comparison
The following case history of vertical drilling operation demonstrates the
accuracy of the planning calculation procedures discussed earlier that utilize complete
major and minor friction loss terms.
Case History This was a vertical well drilled to a depth of 9,571 ft in an oil and
natural gas producing basin in North Africa (Cambrian formation target). The
borehole profile is described by an 9 5/8 inch intermedicate casing run from surface
to 7,632 ft. Below the intermediate casing is a 7 inch production liner that is tied