Yanggu Yihui Drilling Tools Co.,Ltd.
ADDRESS:No.216 Zhengyang Road, Qingdao, Shandong,China.
1) the formation age is far away, the stratum hardness is high, the heterogeneity is high, and the abrasiveness of some sections is high.
2) the borehole is unstable.
3) the dip angle is large and the dip angle is 8~55. Up to 85. It is easy to occur naturally.
4) The formation pressure system is complex, interlacing from negative pressure to abnormal high pressure, with diversity of vertical pressure system and relative independence of transverse pressure system.
5) large size borehole length.