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70 Part I Liquid Drilling Systems

Illustrative Example 3.2 (Continued )

7,000' (2134m)

10,000' (3048m)
Casing ID
7.921" (201mm)
Open Hole
Drill Pipe OD 5' (127 mm) 7.875" (200mm)

Drill Pipe ID 4' (102mm)
Drill Collar OD 5.75' (146mm)
Drill Collar ID 2.75' (70mm) 250' (76.22m)

Drill Collar OD 7' (178mm)
Drill Collar ID 3' (76mm)
60' (18.29m)

Figure 3.4 Example of borehole configuration at the total depth.

Table 3.4 Part of the spreadsheet program Pump Pressure.xls
Input Data 1

Hole depth 10,000 ft
Open hole diameter 7.875 in
Open hole roughness 0.05 in
Cased hole depth 7,000 ft
Cased hole diameter 7.921 in