Drilling Unconsolidated Formations
The following techniques should be used while drilling Unconsolidated Formations:
1. Obtain maximum annular velocities by using critical velocity circulating rates.
2. Use a "Clayball Trap" or a small settling tank upstream of the shakers.
3. When reaming, avoid scouring the sides of the hole with high jet velocities. When reaming with a jet bit, run the pumps at reduced speed. If much reaming is anticipated, use a four nozzle bit. Increase the frequency of check trips. Drill with reduced rpm if conditions permit.
Note: Use four nozzle . . .