Product Description
Double Head Casing Drilling Tools Overburden drilling system
Features:
1.Hardening treatment of the parts surface with longer operating life and excellent anti-wear properties
2.Structure optimization Strengthen the structural
3.Superior performance Smooth with high efficiency
Double Casing Drilling Tools
Double head rotary percussive drilling
Application Range
Grouting holes in projects such as cofferdam, foundation and geothermal well and well, etc.
Working Theory
In combination with a DTH system on the inner drill string, a Rotary-Rotary system is able to achieve deeper depths compared to drifter (top hammer) based systems.
Double head Rotary-Rotary systems are a preferred method for drilling straight, deep holes. These systems offer the driller a high level of flexibility and control to deal with varying ground condition
Two Independent Rotary Heads
Separately drives the outer casing and the inner drill string and are typically mounted on separate sleds which can be adjusted independently to control the position of the inner string in relation to the casing bit.
Casing bits for dual rotary systems are ring bits with tungsten carbide inserts.
The carbide insert is typically a scraping type.
Male/female friction welded double-start rotary percussive casing
Features:
1.Hardening treatment of the parts surface with longer operating life
and excellent anti-wear properties
2.Structure optimization Strengthen the structural
3.Superior performance Smooth with high efficiency
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