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Rockbit "Weight on Bit" and "RPM" Operating Suggestions

 

4-1/2" API Regular Pin Connection

 

 
Weight on Bit per Inch
of Bit Diameter
Total Suggested Weight on Bit
(Pulldown Force)
IADC Class
RPM
Low
High
6 3/4" Bit
7 7/8" Bit
8" Bit
1-1 to 1-4
70 to 120
1,000
3,000
20,250
23,625
24,000
2-1 to 2-4
60 to 100
3,000
5,000
33,750
39,375
40,000
3-1 to 3-4
60 to 80
4,000
7,000
47,250
55,125
56,000
4-1 to 4-4
50 to 150
1,000
5,000
33,750
39,375
40,000
5-1 to 5-4
50 to 150
3,000
6,500
43,875
51,188
52,000
6-1 to 6-4
50 to 120
4,000
7,000
47,250
55,125
56,000
7-1 to 7-4
50 to 90
4,000
8,000
54,000
63,000
64,000
8-1 to 8-4
40 to 80
6,000
9,000
60,750
70,875
72,000

 


4-1/2" API Regular Pin Connection

 

 
Weight on Bit per Inch
of Bit Diameter
Total Suggested Weight on Bit
(Pulldown Force)
IADC Class
RPM
Low
High
8 1/2" Bit
9" Bit
1-1 to 1-4
70 to 120
1,000
3,000
25,500
27,000
2-1 to 2-4
60 to 100
3,000
5,000
42,500
45,000
3-1 to 3-4
60 to 80
4,000
7,000
59,500
63,000
4-1 to 4-4
50 to 150
1,000
5,000
42,500
45,000
5-1 to 5-4
50 to 150
3,000
6,500
55,250
58,500
6-1 to 6-4
50 to 120
4,000
7,000
59,500
63,000
7-1 to 7-4
50 to 90
4,000
8,000
68,000
72,000
8-1 to 8-4
40 to 80
6,000
9,000
76,500
81,000


----------------------------------------------------------------------------------------------

 

6-5/8" API Regular Pin or BECO Connection

 

 
Weight on Bit per Inch
of Bit Diameter
Total Suggested Weight on Bit
(Pulldown Force)
IADC Class
RPM
Low
High
9 7/8" Bit
10 5/8" Bit
11" Bit
1-1 to 1-4
70 to 120
1,000
3,000
29,625
31,875
33,000
2-1 to 2-4
60 to 100
3,000
5,000
49,375
53,125
55,000
3-1 to 3-4
60 to 80
4,000
7,000
69,125
74,375
77,000
4-1 to 4-4
50 to 150
1,000
5,000
49,375
53,125
55,000
5-1 to 5-4
50 to 150
3,000
6,500
64,188
69,063
71,500
6-1 to 6-4
50 to 120
4,000
7,000
69,125
74,375
77,000
7-1 to 7-4
50 to 90
4,000
8,000
79,000
85,000
88,000
8-1 to 8-4
40 to 80
6,000
9,000
88,875
95,625
99,000

 


6-5/8" API Regular Pin or BECO Connection

 

 
Weight on Bit per Inch
of Bit Diameter
Total Suggested Weight on Bit
(Pulldown Force)
IADC Class
RPM
Low
High
11 1/2" Bit
12 1/4" Bit
13 3/4" Bit
1-1 to 1-4
70 to 120
1,000
3,000
34,260
36,750
41,250
2-1 to 2-4
60 to 100
3,000
5,000
57,100
61,250
68,750
3-1 to 3-4
60 to 80
4,000
7,000
79,940
85,750
96,250
4-1 to 4-4
50 to 150
1,000
5,000
57,100
61,250
68,750
5-1 to 5-4
50 to 150
3,000
6,500
74,230
79,625
89,375
6-1 to 6-4
50 to 120
4,000
7,000
79,940
85,750
96,250
7-1 to 7-4
50 to 90
4,000
8,000
91,360
98,000
110,000
8-1 to 8-4
40 to 80
6,000
9,000
102,780
110,250
123,750

 


6-5/8" API Regular Pin or BECO Connection

 

 
Weight on Bit per Inch
of Bit Diameter
Total Suggested Weight on Bit
(Pulldown Force)
IADC Class
RPM
Low
High
15" Bit
16" Bit
17 1/2" Bit
1-1 to 1-4
70 to 120
1,000
3,000
45,000
48,000
52,500
2-1 to 2-4
60 to 100
3,000
5,000
75,000
80,000
87,500
3-1 to 3-4
60 to 80
4,000
7,000
105,000
112,000
122,500
4-1 to 4-4
50 to 150
1,000
5,000
75,000
80,000
87,500
5-1 to 5-4
50 to 150
3,000
6,500
97,500
104,000
113,750
6-1 to 6-4
50 to 120
4,000
7,000
105,000
112,000
122,500
7-1 to 7-4
50 to 90
4,000
8,000
120,000
128,000
140,000
8-1 to 8-4
40 to 80
6,000
9,000
135,000
144,000
157,500
 

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