Construction method of one-time excavation for large-section vertical well
A construction method and large-section technology, which is applied in vertical shaft equipment, earthwork drilling, reverse sinking, etc., can solve the problems of operator injury, increased construction cost, high construction cost, etc., and achieve low construction cost and guaranteed construction safety , the effect of fast construction speed
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[0014] Such as image 3 As shown, the present invention uses the raise rig to complete the 1.4m pilot well construction, install a vertical hoisting system at the wellhead, and transport personnel from the wellhead to the pilot well through the hoisting cage. The hoisting cage is used as the operating platform, because the pilot well has a small operating space , Use short air-leg hand air drills to make approximately horizontal circular radiation holes on the operating platform, complete the drilling from bottom to last, and finally use the hanging cage to cooperate with the bottom-up segmented charging and segmented blasting. After blasting After the slag material falls to the bottom under gravity, the slag is discharged, and the pilot well is excavated in sections from bottom to top. Using this method, the 1.4m pilot well is expanded into a 3.5m slag chute. In a short period of time, it will be transferred to the second expansion and excavation ...
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