How to replace the worn drill

After some time working in the underground drill , drill scraper blade diameter becomes smaller, shorter, blunt , rock crushing capacity will become weak , slowing progress . Tags: geological coring drill concave three wings drill
Drill a certain time after the underground work , scraper blade diameter drill bit smaller , shorter, blunt , rock Crankshaft Grinding  crushing capacity will become weak , slow down progress ; cone bit due to the erosion of tooth wear , bearing damage , can cause cone rotation is not flexible or cone stuck, the torque increases, if not promptly fall from the cone accidents will happen ; diamond drill due to heterogeneity caused by the formation of PDC drill bits crack occurred on , off, off Similarly the drilling footage slower. To speed up the pace of drilling wells whole , must be replaced with the old drill , and drill a few hundred meters to several kilometers in the underground , how to replace the drill bit drilling workers do ?
When drilling rig power driven  hone tool  turntable, kelly , drill and drill bit rotates through the instrument to observe the work of the underground drill rig floor , after the comprehensive judgment, if deemed drill has been worn , replace the drill bit must immediately stop drilling . After stopping drilling, drilling fluid circulation to maintain a period of time , the purpose is to adjust the good performance of the drilling fluid , and the suspension in drilling cuttings out of the ground, the cycle of the new borehole wall remained stable , while also to carry out routine checks on drilling equipment . Workers drilling derrick crane use on the traveling block and hook, according to the height of the mast by column ( generally consisting of two or three drill ) from the entire drill string from the well . After the drill column in the order from the discharge in the derrick while the drill string downhole stone polishing pads  proposed , to use a pump to keep the annular space drilling infusion fluids , the aim of maintaining the liquid level does not fall within the wellbore so that a wellbore pressure to balance the formation pressure to prevent borehole collapse or underground formation fluids into the wellbore . Meanwhile, we should pay particular attention to the reduced diameter borehole drilling may occur card , the operator should be strictly controlled to improve speed. The entire drill wellbore , drill collars from the rear , while the need to replace the drill bit will play out , workers remove the old drill press drill fitted with a new column under the original order can be restored to the wells after drilling