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SIZE | IADC CODE | PIN SIZE |
WEIGHT
(kg.) |
4 3/4” | IADC517,547 | 2 7/8” | 24.2 |
4 7/8” | IADC547 | 2 7/8” | 26.4 |
5 1/2” | IADC547 | 3 1/2” | 29.7 |
5 5/8” | IADC547 | 3 1/2” | 30.2 |
5 2/3” | IADC546 | 3 1/2” | 30.8 |
6” | IADC417,447 | 3 1/2” | 35.2 |
6 1/8” | IADC547 | 3 1/2” | 37.4 |
6 1/4” | IADC517,537 | 3 1/2” | 37.4 |
6 1/2” | IADC517,547,817 | 3 1/2” | 44 |
6 3/4” | IADC517,537 | 3 1/2” | 50.6 |
7 1/2” | IADC517,545,547,625,627,835 | 4 1/2” | 66 |
7 7/8” | IADC417,517,527,537,817 | 4 1/2” | 72.6 |
8 1/2” | IADC417,435,437,517,535,537,547,625,627,635,745,835,837 | 4 1/2” | 81.4 |
8 3/4” | IADC437 | 4 1/2” | 88 |
9 5/8” | IADC535 | 6 5/8” | 121 |
9 7/8” | IADC517,537,737 | 6 5/8” | 127.6 |
10 5/8” | IADC437,535,537,545,547,627,745 | 6 5/8” | 167.2 |
11” | IADC617 | 6 5/8” | 173.8 |
11 5/8” | IADC535,545,625 | 6 5/8” | 198 |
12 1/4” | IADC437,517,535,537,617 | 6 5/8” | 204 |
15 1/2” | IADC545,615 | 7 5/8” | 440 |
17 1/2” | IADC535,545 | 7 5/8” | 594 |
The first well washing circulation can't stop, should pay attention to the washing liquid from the wellhead outflow. The second is to pump unexpected problems led to stop, immediately raising a drill bit, in order to avoid being sand. Third bit nozzle is smaller, the way should be to prevent the nozzle is blocked.
a point, in addition to rolling out there, drilling teeth do rolling cutting effect, the bottom gradually being broken, so successfully drilled through strata.
Method of operation
1 measurements of good size, matching the corresponding joint.
2 well check each bit roller flexibility, loose or not, connection of drilling tools.
3 to the bottom, the rotating disk, to be smooth, then slowly down, all the sand flushing as well.
Gradually add pressure to 4 bit, the intensity should not be too large, otherwise the bit may lead to deformation or wheel fall off slowly.
5 drilling speed must be just perfect, drilling cement fifty to seventy drill more appropriate.
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