Drilling and Completion Engineering II An exploration well is to be drilled to a total depth of 19000 ft, relevant data are as follows: Safety factors for collapse and burst are 0.9 and 1.05 respectively. Design suitable casing strings for the given hole sizes, taking into consideration the available casing grades and the maximum expected pressures. The answer by hand written in a clear way

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Drilling and Completion Engineering II An exploration well is to be drilled to a total depth of 19000 ft, relevant data are as follows: Safety factors for collapse and burst are 0.9 and 1.05 respectively. Design suitable casing strings for the given hole sizes, taking into consideration the available casing grades and the maximum expected pressures. The answer by hand written in a clear way
Available Casing Grades
Size (in)
Grade
ID (in)
Weight (lb/ft)
Coupling Type
20
K55
19.124
94
BTC
K55
19
106.5
LTC
K55
18.73
133
LTC
K55
15.01
84
BTC
16
N 80
14.868
95
BTC
N80
0.575
97
BTC
13 3/8
K55
12.615
54.5
STC
K55
12.415
68
BTC
L80
12.347
72
BTC
95/8
K55
8.921
36
BTC
L80
8.681
47
BTC
C95
8.535
53.5
BTC
7
K55
6.276
26
26
BTC
L80
6.184
29
C95
6.184
29
22
BTC
BTC
Transcribed Image Text:Available Casing Grades Size (in) Grade ID (in) Weight (lb/ft) Coupling Type 20 K55 19.124 94 BTC K55 19 106.5 LTC K55 18.73 133 LTC K55 15.01 84 BTC 16 N 80 14.868 95 BTC N80 0.575 97 BTC 13 3/8 K55 12.615 54.5 STC K55 12.415 68 BTC L80 12.347 72 BTC 95/8 K55 8.921 36 BTC L80 8.681 47 BTC C95 8.535 53.5 BTC 7 K55 6.276 26 26 BTC L80 6.184 29 C95 6.184 29 22 BTC BTC
Drilling program:
0 - 350 ft
t
26-in. hole
350 - 5,000 ft
->
20-in. hole
5,000
11,100 ft
->
11,100
14,000 ft
17.5-in.hole
12.5-in. hole
14,000
19,000 ft ->
8.5-in. hole
Casing program
0 - 350 ft
->
20-in.
conductor pipe
0 – 5,000 ft
->
16-in.
surface casing
0 - 11,100 ft
-
13.375-in.
intermediate casing
11,100 – 14,000 ft
9.625-in.
liner
0 - 19,000 ft
→
7-in.
production casing
Formation fluid gradient
0 - 350 ft
0.465 psi/ft
350 - 5,000 ft
→
0.465 psi/ft
5,000
11,100 ft
0.597 psi/ft
11,100 – 14,000 ft
→
0.849 psi/ft
14,000 – 19,000 ft ->
0.906 psi/ft
0 - 350 ft
Mud program
9.5
ppg (70.7 lb/ft³)
0 - 5,000 ft
9.5
Ppg (70.7 lb/ft³)
0 - 11,100 ft
0 - 14,000 ft
->
12.0 ppg (89.8 lb/ft³)
->
16.8
0 - 19,000 ft
->
17.9
Ppg (125.7 lb/ft³)
Ppg (133.9 lb/ft³)
Transcribed Image Text:Drilling program: 0 - 350 ft t 26-in. hole 350 - 5,000 ft -> 20-in. hole 5,000 11,100 ft -> 11,100 14,000 ft 17.5-in.hole 12.5-in. hole 14,000 19,000 ft -> 8.5-in. hole Casing program 0 - 350 ft -> 20-in. conductor pipe 0 – 5,000 ft -> 16-in. surface casing 0 - 11,100 ft - 13.375-in. intermediate casing 11,100 – 14,000 ft 9.625-in. liner 0 - 19,000 ft → 7-in. production casing Formation fluid gradient 0 - 350 ft 0.465 psi/ft 350 - 5,000 ft → 0.465 psi/ft 5,000 11,100 ft 0.597 psi/ft 11,100 – 14,000 ft → 0.849 psi/ft 14,000 – 19,000 ft -> 0.906 psi/ft 0 - 350 ft Mud program 9.5 ppg (70.7 lb/ft³) 0 - 5,000 ft 9.5 Ppg (70.7 lb/ft³) 0 - 11,100 ft 0 - 14,000 ft -> 12.0 ppg (89.8 lb/ft³) -> 16.8 0 - 19,000 ft -> 17.9 Ppg (125.7 lb/ft³) Ppg (133.9 lb/ft³)
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