Abstract:Wireline coring technology has been widely used in the field of geological exploration， but the problem of drilling leakage affecting construction efficiency and safety is still prominent. Analyzing the characteristics of the existing wireline core drilling and plugging， three new safe and fast plugging processes are proposed： drilling plugging ball process， internal pipe injection of anti dispersion rapid setting cement process， and hole injection of hydrophobic chemical cementitious material process. The drilling and plugging ball technology uses a pounding cone to compress， deform， and break the developed plugging ball without lifting the drill， forcibly filling the formation gaps， aiming to solve the contradiction of “large particles difficult to enter the gaps and small particles difficult to bear pressure” in inert material plugging， and achieve the safe and rapid plugging goal of “entering， retaining， and bearing”. The process of injecting anti dispersion rapid setting cement into the inner pipe fully utilizes the wireline core winch to inject the inner pipe to achieve leak sealing. The modified cement slurry developed is loaded into the inner pipe and matched with the slurry release valve in place to achieve precise injection of the slurry without lifting the drill. After self leveling at the bottom of the hole， it quickly solidifies， which can minimize the risk of water invasion pollution and buried drilling. The process of adding hydrophobic chemical cementitious materials through the orifice adopts a mixture of polyurethane polyurea， quicklime， and polyethyleneimine to form a slurry. The material is added through the orifice and accompanied by clean water flowing into the hole. It can pass through a long distance of water filled holes to reach the bottom of the hole， and after self leveling， it quickly solidifies to achieve leak sealing. This article provides a detailed introduction to the preparation principles， operating steps， on-site evaluation， and advantages and disadvantages of each process， striving to achieve safer， more convenient， efficient， and low pollution leak prevention for wireline coring， and providing reference for technical personnel.
