Areain2 = Diameterin2 x 0.7854
Example:
What is the cross-sectional area of 5 inch casing 21.4 lbs/ft P-110?
5 inch casing 21.4 lbs/ft P-110 has inside diameter (ID) of 4.126 inch
The cross-sectional area of 5 inch casing 21.4 lbs/ft P-110 = 4.1262 x 0.7854 = 13.37 in2
Volumebbl = Pipe Internal Capacitybbl/ft x Pipe Lengthft
Pipe Internal Capacity in bbl/ft for each type of pipe such as drill pipe, tubing, casing, or even open hole can be found in engineering handbook tables.
Size OD (in)
Wt/Ft with Couplings (lb)
ID (in)
Bbl Per Lin Ft
Lin Ft Per Bbl
Gal Per Lin Ft
Lin Ft Per Gal
5
11.50
4.560
0.0202
49.51
0.8484
1.1787
5
13.00
4.494
0.0196
50.97
0.8240
1.2136
5
15.00
4.408
0.0188
52.98
0.7928
1.2614
5
18.00
4.276
0.0177
56.30
0.7460
1.3405
5
21.40
4.126
0.0165
60.47
0.7040
1.4204
5
24.10
4.000
0.0146
68.56
0.6528
1.5319
Pipe… Continue Reading
Pipe Displacement as used herein is the volume taken up by the metal in a string of pipe.
Incremental Pipe Displacement bbl/ft = ( Pipe Outside Diameterin (OD)2 - Pipe Inside Diameterin (ID)2) ÷ 1029.4
Volume Displaced by Pipebbl = Incremental Pipe Displacement bbl/ft x Pipe Lengthft
Example:
When tripping in 2 7/8 inch tubing 6.5 lb/ft L-80, how much fluid would 10,000 ft of tubing displace?
Based on tubing specification, outside and inside diameters are as below:
Outside Diameter (ID) of 2 7/8 inch tubing 6.6 lbs/ft L-80 = 2.875 inch… Continue Reading
Annular Capacitybbl/ft = ( Inside Diameterin (ID)2 - Outside Diameterin (OD)2 ) ÷ 1029.4
Inside Diameter (ID) (inch): Inside diameter of the outside pipe
Outside Diameter (OD) (inch): Outside diameter of the inside pipe
Annular Capacity (bbl/ft): annular volume between two pipes per foot
Example:
Annular capacity between 5-1/2 inch casing 23 lbs/ft P110 and 4-1/2 inch casing over 10,000 ft
5-1/2 inch casing 23 lbs/ft P110 has ID of 4.67 inch
That means:
Inside Diameter (ID) of outside pipe = 4.67 inch
Outside Diameter (OD) of inside pipe = 4.5 inch
… Continue Reading
Internal Capacitybbl/ft = Inside Diameterin (ID)2 ÷ 1029.4
Inside Diameter (ID) (inch): Inside diameter of a pipe
Internal Capacity (bbl/ft): Internal volume of a pipe per foot
Example:
Volume of 5 inch casing 21.4 lbs/ft P-110 over 10,000 ft
That means:
Inside Diameter (ID) of 5 inch casing 21.4 lbs/ft P-110 = 4.126 inch
Internal Capacitybbl/ft = 4.1262 ÷ 1029.4 = 0.0165 bbl/ft
Volume of 5 inch casing 21.4 lbs/ft P-110 over 10,000 ft = 0.0165 bbl/ft x 10,000 ft = 165 bbls