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What to do if the hole of the DTH hammer is blocked during drilling?


2022-03-04


Suction blockage of the DTH hammer generally occurs when there are many residual debris in the well, especially in the condition of “thick paste”. The pressure difference inside and outside the circulation channel is large, and the bottom hole rock powder is sucked back from the clearance of the DTH hammer.
Solutions:
(1) Carefully check the DTH hammer check valve and replace the damaged parts before drilling down.
(2) Carefully check whether the clearance and sealing performance of the piston and the inner (outer) cylinder, piston and valve are in good condition, and replace the damaged parts.
(3) Strictly implement the operating procedures to avoid blockage of rock powder sucking back due to improper operation.
(4) Using a reasonable drilling tool combination, a floating valve joint can be added at 150-200m of the drilling tool to overcome the rock powder sucking back under the action of the pressure difference in the circulation channel.
(5) When the air supply is not smooth, move the drilling tool up and down to a large extent immediately. If it is invalid, the drilling tool should be tripped and checked immediately.
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