Characteristics and contermeasures for drilling leakage in Laiwu iron-rich mining area

Abstract:

The regional geological structure of the Laiwu iron-rich mining area in Shandong is well-developed， with complex and diverse stratigraphic lithology. Influenced by factors such as geological tectonic movements and groundwater activities， various leakage channels have formed. Severe drilling fluid leakage， frequent accidents such as drill burning， sticking， and breaking occur in the area， leading to high construction difficulty and costs. During the core drilling of three boreholes， multiple formation leakage issues were encountered， including groundwater flow channel leakage， fissure leakage， and karst cave leakage. On-site research on plugging countermeasures was carried out， and the drilling tasks were successfully completed by adopting methods such as simultaneous drilling and plugging， stop drilling for plugging， and drilling against leakage. This has accumulated experience for solving complex formation leakage problems in the Laiwu area.