In the nickel mine project at Hongqiling Jilin province, there is a chloritization altered fracture zone as fragmental clay which easily happen hydration expansion under influence of water
Using conventional mud is difficult to achieve ideal wall protection effect [1], and easy to cause pump choking up and hole wall collapse and etc
in drilling process, at last the drilling cannot continues.
The gold drilling project at Zhouqu Gansu province, over 150 m peat deposition carbonaceous slate had been encountered during drilling construction, which presented crushed shape and fine granular.
When the stratum is in contact with water, its strength sharply falls, and chipping and peeling, etc