承德M24矿区深孔钻探钻进参数的选择分析

结合承德M24矿区深孔钻探工程,对钻进参数的选择情况进行了分析。分析认为,深孔钻进中,钻进压力的选择要综合考虑钻进的口径大小,岩石的硬度、强度、研磨性、完整性;在一定范围内,金刚石钻头的钻速和转速成正比例关系;冲冼液的选择应根据钻头类型与规格,胎体性能,钻孔深度,岩石研磨性、完整程度等来选择;适当扩大金刚石钻头的外径尺寸,能有效地避免高泵压的危害;可通过观察钻机主电机的电流指示表数值变化,判断孔内钻杆工况,电流的变化反映出钻机回转扭矩的变化。

Selection Analysis on Drilling Parameters of Deep Drilling in M24 Mining Area of Chengde

With the deep drilling project of M24 mining area in Chengde, analysis was made on the application effect of selection of drilling parameters. In deep hole drilling, drilling pressure should be selected by considering the drilling diameter; hardness, strength, abrasiveness, integrity of rock. Within a certain range, the ROP of diamond bit is proportional to the rotary speed; the selection of flushing fluid should be based on the bit type and size, matrix properties, drilling depth, rock abrasiveness and integrity; the appropriate enlargement of the outside diameter of diamond bit can effectively avoid the hazards of high pressure pump; down-hole drill rod conditions can be determined by observing the changing value of current in current instruction sheet of main motor. Current changes reflect the changes of rotary torque of the drill.