API Standards for Manufacturing and API Casing Chart
API Standards For Rock Bits And PDC Bits
In the drilling industry, adherence to API standards is paramount for clear communication and quality assurance. API standards, established by the American Petroleum Institute (API), provide vital guidelines for drill bit manufacturing, including PDC drill bits and tricones.
API Standards and Their Importance:
API standards govern the tolerances and specifications for drill bit manufacturing, ensuring consistency and reliability across the industry. By adhering to API standards, drilling professionals can trust in the quality and compatibility of equipment from various manufacturers.
API Certified Casing and Casing Charts:
API certification guarantees that casing materials meet stringent industry standards. The API casing chart serves as a reference for selecting the appropriate casing size and specifications for drilling operations. It provides essential information such as casing size, coupling OD, nominal weight, inside diameter, and API drift ID.
Utilizing API Casing Charts:
Drilling professionals rely on API casing charts to determine the correct drill bit size and compatibility with casing dimensions. These charts streamline the selection process, ensuring efficient and effective drilling operations.
API Standards for Bit Tolerances:
API establishes tolerances for PDC bits and rock bits, maintaining consistency and precision in drilling operations. These standards dictate permissible deviations in bit size, ensuring compatibility with drilling equipment and procedures.
Optimizing Drill Bit Performance:
By adhering to API standards for bit tolerances, drill bit manufacturers optimize performance and reliability. Consistent adherence to these standards enhances drilling efficiency and reduces the risk of equipment malfunction.
Conclusion:
In the dynamic world of drilling, adherence to API standards and utilization of API casing charts are essential for success. By following established guidelines and utilizing standardized resources, drilling professionals can achieve optimal performance and reliability in their operations.
American Petroleum Institute Standards for PDC and Rock Bit Tolerances
Bit Size (In.) | O.D. Tolerance (In.) | |
---|---|---|
6 3/4" and smaller | -0.015 to +0.00 PDC | -0.0 to +1/32 Rock Bit |
6 25/32" to 9" | -0.020 to +0.00 PDC | -0.0 to +1/32 Rock Bit |
9 1/32" to 13 3/4" | -0.030 to +0.00 PDC | -0.0 to +1/32 Rock Bit |
13 25/32" to 17 1/2" | -0.045 to +0.00 PDC | -0.0 to +1/16 Rock Bit |
17 17/32" and larger | -0.063 to +0.00 PDC | -0.0 to +3/32 Rock Bit |
Use either a “go” gauge or a “no go” gauge to gauge PDC bits.
Use a “no go”gauge to ensure a bit is not smaller than allowed. As its name implies, it should not go or slip down the entire length of the bit. A “go gauge ensures a bit is not larger than allowed and should slip down the entire bit.
Rock Bit Size and API Standard Connection
Rock Bit Size and API Standard Connection | |
3 1/2" to 4 1/2" drill bits | 2 3/8" API Reg. pin |
4 5/8" to 5 1/2" drill bits | 2 7/8" API Reg. pin |
5 5/8" to 7 3/8" drill bits | 3 1/2" API Reg. pin |
7 1/2" to 9 3/8" drill bits | 4 1/2" API Reg. pin |
9 1/2" to 14 3/8" drill bits | 6 5/8" API Reg. pin |
14 1/2" to 18 1/2" drill bits | 6 5/8" or 7 5/8" API Reg. pin |
18 5/8" to 26" drill bits | 7 5/8" or 8 5/8" API Reg. pin |
27" and larger | 8 5/8" API Reg. pin |
TFA Flow Chart
Number of Nozzles | ||||||||
Nozzle Size | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
7 | 0.0376 | 0.0752 | 0.1127 | 0.1503 | 0.1877 | 0.2255 | 0.2631 | 0.3007 |
8 | 0.0491 | 0.0982 | 0.1473 | 0.1963 | 0.2454 | 0.2945 | 0.3435 | 0.3927 |
9 | 0.0621 | 0.1242 | 0.1864 | 0.2485 | 0.3106 | 0.3728 | 0.4249 | 0.497 |
10 | 0.0767 | 0.1534 | 0.2301 | 0.306 | 0.3835 | 0.4602 | 0.5369 | 0.6136 |
11 | 0.0928 | 0.1856 | 0.2784 | 0.3712 | 0.464 | 0.5568 | 0.6496 | 0.7424 |
12 | 0.1104 | 0.2209 | 0.3313 | 0.4418 | 0.5522 | 0.6627 | 0.7731 | 0.8836 |
13 | 0.1296 | 0.2592 | 0.3889 | 0.5185 | 0.6481 | 0.7777 | 0.9073 | 1.037 |
14 | 0.1503 | 0.3007 | 0.451 | 0.6013 | 0.7517 | 0.902 | 1.0523 | 1.2026 |
15 | 0.1726 | 0.3451 | 0.5177 | 0.6903 | 0.8629 | 1.0354 | 1.208 | 1.3806 |
16 | 0.1963 | 0.3927 | 0.589 | 0.7854 | 0.9817 | 1.1781 | 1.3744 | 1.5708 |
18 | 0.2485 | 0.497 | 0.7455 | 0.994 | 1.2425 | 1.491 | 1.7395 | 1.988 |
20 | 0.3068 | 0.6136 | 0.9204 | 1.2272 | 1.534 | 1.8408 | 2.1476 | 2.4544 |
22 | 0.3712 | 0.7424 | 1.1137 | 1.4849 | 1.8561 | 2.2273 | 2.5986 | 2.9698 |
The API Casing Chart below helps determine the drill bit size you need.
API Casing Chart
Number of nozzles | ||||||||
Casing Size OD | Casing Coupling OD | Nominal Weight | Inside Diameter ID | API Drift ID | Roller Cone Bit Size OD | Fixed Cutter Bit Size OD |
||
Inches | Inches | Lbs/ft | Inches | Inches | Inches | Decimal | Inches | Decimal |
4 1/2 | 5 | 9.5 | 4.09 | 3.965 | 3 7/8 | 3.875 | 3 7/8 | 3.875 |
4.5 | 5 | 10.5 | 4.052 | 3.927 | 3 7/8 | 3.875 | 3 7/8 | 3.875 |
5 | 11.6 | 4 | 3.875 | 3 7/8 | 3.875 | 3 7/8 | 3.875 | |
5 | 13.5 | 3.92 | 3.795 | 3 3/4 | 3.75 | 3 3/4 | 3.75 | |
5 | 5.563 | 11.5 | 4.56 | 4.435 | 4 3/8 | 4.375 | 4 3/4 | 4.375 |
5 | 5.563 | 13 | 4.494 | 4.369 | 4 1/4 | 4.25 | 4 1/4 | 4.25 |
5.563 | 15 | 4.408 | 4.283 | 4 1/4 | 4.25 | 4 1/4 | 4.25 | |
5.563 | 18 | 4.276 | 4.151 | 4 1/8 | 4.125 | 4 1/8 | 4.125 | |
5 1/2 | 6.05 | 14 | 5.012 | 4.887 | 4 3/4 | 4.75 | 4 3/4 | 4.75 |
5.5 | 6.05 | 15.5 | 4.95 | 4.825 | 4 5/8 | 4.75 | 4 5/8 | 4.75 |
6.05 | 17 | 4.892 | 4.767 | 4 5/8 | 4.75 | 4 5/8 | 4.75 | |
6.05 | 20 | 4.778 | 4.653 | 4 1/2 | 4.5 | 4 1/2 | 4.5 | |
6.05 | 23 | 4.67 | 4.545 | 4 1/2 | 4.5 | 4 1/2 | 4.5 | |
6 5/8 | 7.39 | 20 | 6.049 | 5.924 | 5 7/8 | 5.875 | 5 7/8 | 5.875 |
6.625 | 7.39 | 24 | 5.921 | 5.796 | 5 1/2 | 5.5 | 5 1/2 | 5.5 |
7.39 | 28 | 5.791 | 5.666 | 5 1/4 | 5.25 | 5 1/4 | 5.25 | |
7.39 | 32 | 5.675 | 5.55 | 5 1/4 | 5.25 | 5 1/4 | 5.25 | |
7 | 7.656 | 17 | 6.538 | 6.413 | 6 1/4 | 6.25 | 6 1/4 | 6.25 |
7 | 7.656 | 20 | 6.456 | 6.331 | 6 1/4 | 6.25 | 6 1/4 | 6.25 |
7.656 | 23 | 6.366 | 6.241 | 6 1/8 | 6.125 | 6 1/8 | 6.125 | |
7.656 | 26 | 6.276 | 6.151 | 6 1/8 | 6.125 | 6 1/8 | 6.125 | |
7.656 | 29 | 6.184 | 6.059 | 6 | 6 | 6 | 6 | |
7.656 | 32 | 6.094 | 5.969 | 5 7/8 | 5.875 | 5 7/8 | 5.875 | |
7.656 | 35 | 6.004 | 5.879 | 5 7/8 | 5.875 | 5 7/8 | 5.875 | |
7.656 | 38 | 5.92 | 5.795 | 5 1/2 | 5.5 | 5 1/2 | 5.5 | |
7 5/8 | 8.5 | 20 | 7.125 | 7 | 6 3/4 | 6.75 | 6 3/4 | 6.75 |
7.625 | 8.5 | 24 | 7.025 | 6.9 | 6 3/4 | 6.75 | 6 3/4 | 6.75 |
8.5 | 26.4 | 6.969 | 6.844 | 6 3/4 | 6.75 | 6 3/4 | 6.75 | |
8.5 | 29.7 | 6.875 | 6.75 | 6 1/2 | 6.5 | 6 1/2 | 6.5 | |
8.5 | 33.7 | 6.765 | 6.64 | 6 1/2 | 6.5 | 6 1/2 | 6.5 | |
8.5 | 39 | 6.625 | 6.50 | 6 1/4 | 6.25 | 6 1/4 | 6.25 | |
8 5/8 | 9.625 | 24 | 8.097 | 7.972 | 7 7/8 | 7.875 | 7 7/8 | 7.875 |
8.625 | 9.625 | 28 | 8.017 | 7.892 | 7 7/8 | 7.875 | 7 7/8 | 7.875 |
9.625 | 32 | 7.921 | 7.796 | 6 3/4 | 6.75 | 6 3/4 | 6.75 | |
9.625 | 36 | 7.825 | 7.7 | 6 3/4 | 6.75 | 6 3/4 | 6.75 | |
9.625 | 40 | 7.725 | 7.6 | 6 3/4 | 6.75 | 6 3/4 | 6.75 | |
9.625 | 44 | 7.625 | 7.5 | 6 3/4 | 6.75 | 6 3/4 | 6.75 | |
9.625 | 49 | 7.511 | 7.386 | 6 3/4 | 6.75 | 6 3/4 | 6.75 | |
9 5/8 | 10.625 | 29.3 | 9.063 | 8.907 | 8 3/4 | 8.75 | 8 3/4 | 8.75 |
9.625 | 10.625 | 32.3 | 9.001 | 8.845 | 8 3/4 | 8.75 | 8 3/4 | 8.75 |
10.625 | 36 | 8.921 | 8.765 | 8 3/4 | 8.75 | 8 3/4 | 8.75 | |
10.625 | 40 | 8.835 | 8.679 | 8 1/2 | 8.5 | 8 1/2 | 8.5 | |
10.625 | 43.5 | 8.755 | 8.599 | 8 1/2 | 8.5 | 8 1/2 | 8.5 | |
10.625 | 47 | 8.681 | 8.525 | 8 1/2 | 8.5 | 8 1/2 | 8.5 | |
10.625 | 53.5 | 8.535 | 8.379 | 8 3/8 | 8.375 | 8 3/8 | 8.375 | |
10 3/4 | 11.75 | 32.75 | 10.192 | 10.036 | 9 7/8 | 9.875 | 9 7/8 | 9.875 |
10.75 | 11.75 | 40.5 | 10.05 | 9.984 | 9 7/8 | 9.875 | 9 7/8 | 9.875 |
11.75 | 45.5 | 9.95 | 9.794 | 9 1/2 | 9.5 | 9 1/2 | 9.5 | |
11.75 | 51 | 9.85 | 9.694 | 9 1/2 | 9.5 | 9 1/2 | 9.5 | |
11.75 | 55.5 | 9.76 | 9.604 | 9 1/2 | 9.5 | 9 1/2 | 9.5 | |
11.75 | 60.7 | 9.66 | 9.504 | 9 1/2 | 9.5 | 9 1/2 | 9.5 | |
11.75 | 65.7 | 9.56 | 9.404 | 8 3/4 | 8.75 | 8 3/4 | 8.75 | |
11 3/4 | 12.75 | 42 | 11.084 | 10.928 | 10 5/8 | 10.625 | 10 5/8 | 10.625 |
11.75 | 12.75 | 47 | 11 | 10.844 | 10 5/8 | 10.625 | 10 5/8 | 10.625 |
12.75 | 54 | 10.88 | 10.724 | 10 5/8 | 10.625 | 10 5/8 | 10.625 | |
12.75 | 60 | 10.772 | 10.616 | 9 7/8 | 9.875 | 9 7/8 | 9.875 | |
13 3/8 | 14.375 | 48 | 12.715 | 12.559 | 12 1/4 | 12.25 | 12 1/4 | 12.25 |
13.375 | 14.375 | 54.5 | 12.615 | 12.459 | 12 1/4 | 12.25 | 12 1/4 | 12.25 |
14.375 | 61 | 12.515 | 12.359 | 12 1/4 | 12.25 | 12 1/4 | 12.25 | |
14.375 | 68 | 12.415 | 12.259 | 12 1/4 | 12.25 | 12 1/4 | 12.25 | |
14.375 | 72 | 12.347 | 12.191 | 11 | 11 | 10 5/8 | 10.625 | |
16 | 17 | 65 | 15.25 | 15.062 | 14 3/4 | 14.75 | 14 3/4 | 14.75 |
16 | 17 | 75 | 15.124 | 14.936 | 14 3/4 | 14.75 | 14 3/4 | 14.75 |
17 | 84 | 15.01 | 14.822 | 14 3/4 | 14.75 | 14 3/4 | 14.75 | |
18 5/8 | 20 | 87.5 | 17.755 | 17.567 | 17 1/2 | 17.5 | 17 1/2 | 17.5 |
18.625 | - | - | - | - | - | - | - | - |
20 | 21 | 94 | 19.124 | 18.936 | 17 1/2 | 17.5 | 17 1/2 | 17.5 |
20 | 21 | 106.5 | 19 | 18.812 | 17 1/2 | 17.5 | 17 1/2 | 17.5 |
21 | 133 | 18.73 | 18.542 | 17 1/2 | 17.5 | 17 1/2 | 17.5 | |
21 | 169 | 18.376 | 18.188 | 17 1/2 | 17.5 | 17 1/2 | 17.5 |