The analytic hierarchy process(AHP) to evaluate the optimum effect of the preventing wear tools of casing was put forward,which combined drilling engineering actuality with casing wear analysis technique and started with affecting factors of preventing wear tools of casing selection and relation composing of the factors,and the database was established.

By using the profile modeling machining equipment of helix angle, a new method about grinding rake face of gear cutter hob on tool grinder is presented.

The NC remaking scheme of tool grinder is a closed-loop control system, which uses single-chip microcomputer as a control system and step motor as the executive equipment.

Taking AutoCAD R14 as the operating platform, a machining simulation system for 5 axle coordinated CNC tool grinder is developed by using ActiveX Automation technology.

In view of the long period of milling of which the average is 48 days and high probability of accidents during the drilling,the blocking technology of the perforation in the liner and the milling tools are developed,as well as the research on milling technologies,systematic drilling technologies,and protection technologies of casing are conducted.