Mud flow controlled should in accordance with the geological condition. Drilling process control good guide hole in the mud flow is the key to avoid the mud spillover. If the drill hole orientation do not appear and have the slurry phenomenon, then reaming, dragged back probability of oozing slurry is very low, because, the guide hole is completed, the pressure on both sides of the balance point, unearthed, mud flow and soil on both sides, in the region through the axis through the risk slurry will be reduced accordingly.
Therefore, in order to achieve this goal, the mud pump capacity must be based on geological reasonable control, because of the shallow geological generally backfill soil or backfill garbage, very soft, compactness is poor.Therefore, reduce the mud pressure below 2Mpa, and according to the bit used to reduce the size of the mud flow, sometimes flow only 150 liters / minute is enough, we must try to avoid the mud discharge excessive pressure caused by excessive oozing slurry, pollution to the construction area.
1.Equipped with perfect fluid circulation and cleaning treatment and recovery system, reducing the consumption of mud;
2.Return to the mud pool using mud cleaning recovery system of mud sand removal and a series of purification treatment, the mud recycling to control the amount of mud;
3.Application of solidification technology, which is to meet the requirements of environmental protection.