Classification:
By function:
•for workover rigs;
•for mobile drilling rigs;
•for cluster and land drilling rigs;
•for offshore drilling rigs.
By design:
•mast derricks (А-type, U-type, 4-leg derricks, open face derricks);
•tower derricks.
Today in drilling rigs design, open face derricks are the most widely applicable.
Open face derrick advantages:
•convenience of the top drive installation;
•the substructure erection in down position without special heavy-duty cranes;
•reduction of rig-up time;
•drilling rig transportation from one drilling location to another in vertical position by large block,
without additional re-erection.
| Parameters/Model | M 34/160 OG-R | M 33/200 OG-R | M 45/225 R | M 45/320 R | M 46/320 OG-R | B 53/400 R | M 46/450 OG-R | M 46/500 OG-R |
| Max. static hook load, lbs. (m) |
440924 (200) | 529109 (240) | 595248 (270) | 846575 (384) | 846575 (384) | 105821 (480) | 1190496 (540) | 1322773 (600) |
| Distance between rotary table and lower part of crown block frame, ft. (m) |
111.5 (34,0) | 108.2 (33,0) | 149.6 (45,6) | 147.0 (44,8) | 150.9 (46) | 147.6 (45) | 150.9 (46) | 150.9 (46) |
| Distance between pins of lower and upper hinges at the support, ft. (m) |
— | 113.7 (34,66) | 156.0 (47,55) | 156.0 (47,55) | 161.1 (49,11) | — | 171.2 (52,2) | 171.2 (52,2) |
| Subbase (distance between pins of hinges at the support of derrick legs), ft. (m) |
||||||||
| transversely catwalk axis | — | 4.9 (1,5) | — | — | — | 32.8 (10,0) | — | — |
| along catwalk axis | 8.8 (2,7) | 10.5 (3,2) | 33.8 (10,3) | 33.8 (10,3) | 32.8 (10,0) | 32.8 (10,0) | 32.8 (10,0) | 32.8 (10,0) |
| Upper base (distance between crown block frame supports), ft |
||||||||
| along catwalk axis | 2.9 (0,89) | 3.0 (0,91) | 7.5 (2,3) | 7.5 (2,3) | 8.5 (2,6) | 9.2 (2,8) | 8.5 (2,6) | 8.5 (2,6) |
| transversely catwalk axis | 3.9 (1,2) | 5.6 (1,7) | 8.5 (2,6) | 9.6 (2,93) | 8.5 (2,6) | 9.2 (2,8) | 8.5 (2,6) | 8.5 (2,6) |
