THE NEW UNDERGROUND POSITIONING SYSTEM

It is of importance to position finding of bit for orientational drilling.Specially it is essential to downhole closed-loop automated drilling and intelligent drilling in the future.This paper introduces a new underground positioning system and it's idea,content and reality.According to the realities of drilling engineering,it provides three new nuderground positioning systems-underground GPS, underground radar and underground CT.The principle and technical structure for the new type systems and penetration frequency has been discussed.Also we look forward a prospects to the applied perspective of new underground positioning system in drilling engineering and other engineering for the twenty-first century.