Technology of DTH Drilling with Simultaneous Casing and the Application

Abstract:

Drilling with simultaneous casing technology has been developed to be an effective method to deal with drilling in complicated formation. The paper introduced the characteristics of DTH drilling with simultaneous casing technology, SP series of simultaneous casing drilling tool and the application of DTH drilling with simultaneous casing technology in drilling in complicated formation, such as control of geological hazard, hydropower construction, foundation treatment for urban high-rise building, highway and railway construction.

Key words:DTH; drilling with simultaneous casing; complicated formation; geological hazard