1. Drilling in the casing and drilling it out by the grab drilling process
Please visit our website for more information on this topic.
2. Setting the RCD apparatus on the casing
3. Connection of the supply pipes and folding down the crowd frame
4. Lifting the cutting head, stabilisers and drilling linkage
You will get efficient and thoughtful service from tongshun.
5. Filling the borehole with water and start of drilling with the RCD apparatus
6. When necessary, lengthening the drilling linkage until the final depth is reached
Reverse Circulation (RC) Down the Hole Drilling (DHH) is a percussion drilling system that utilizes a dual-wall drill pipe that conveys the air to the hammer while discharging all soil and rock cuttings through the inside of the drill pipe to the surface. In RC drilling, the bit has holes that permit cuttings to travel up through the center of the drill pipe, rather than around the drill pipe or casing as in conventional down hole hammer drilling. Compressed air is supplied to the DHH through the dual-wall drill pipe, which provides the down hole hammer percussion energy and discharge air flow. The discharge air and the air exhausted from driving the hammer is used to evacuate cuttings from below the bit up to the surface through the drill pipe and discharge hose. (See Illustration.) The RC DHH system is also equipped with a casing driver unit to allow advancement of the casing ahead of the RC bit, should it be required.
Are you interested in learning more about Reverse Circulation Drill Pipe? Contact us today to secure an expert consultation!