Эксцентриковая обсадная система для буровой установки глубоководных скважин
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overburden casing system | concentric system | block system | wing system |
1,When drilling starts,the ODEX reamer swings out and reams the pilot-hole wide enough for
the casing tube to slide down behind the drill bit assembly.
2,When the required depth is reached,rotation is reversed carefully.
where upon the reamer swings in,allowing the drill bit assemblyto be pulled up through the casing.
3,Casing tubes that are to be left in the drill hole should be sealed at the
bottom of the hole by means of cement grout or some other sealing agent.
4,Drilling continues to the desired depth in the bedrock using a conventional drill bit.
Q:What kind of rock drilling tools can you provide?
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