Construction Technique of Deep Hole Drilling in Complex Phosphate Rock

Abstract:

The paper presents the construction technology of deep hole drilling in complex strata in Xingshan phosphate mine of Hubei province. The bit and drilling technology parameters were properly chosen for drilling in the complex strata. High quality drilling fluid was used in fractured hole section drilling with case for hole wall stability, cementing was used in serious collapsing and block-falling sections and wire-line coring tools and XY-5 type driller were used to complete 1930 m deep hole in complex strata.