Down-the-hole drill rig water drilling video

What is down-the-hole (DTH) drilling?

Down-the-hole (DTH) drilling has made it easier for contractors to drill wells faster and more efficiently, and to transition from dirt boring to rock boring just by adding a compressor and hammer to the drill bit.

What is a DTH drill rig?

A down-the-hole drill, usually called DTH Drilling Rig, is basically a mini jackhammer screwed on the bottom of a drill string. The speedy hammer activity breaks hard stone into little flakes and dust and can be dismissed evident by the air exhaust in the DTH hammer.

What is a down-the-hole drill?

A down-the-hole drill, usually called DTH, is basically a mini jackhammer screwed on the bottom of a drill string.

How do you drill a hole?

For production hole drilling, there are fundamentally three basic methods, as illustrated in Figure 1: rotary, rotary percussive top drive (top hammer), and rotary percussive down-the-hole hammering (DTH). An elderly but still useful application chart was produced by McGregor (1967) and is reproduced in Figure 2. Figure 1.

How does DTH drilling work?

With DTH drilling, contractors can change the drill that they were using for the current directional bore to a rock drill when they encounter rock by connecting the drill with a compressor and a steerable hammer. Well drilling also needed changes to be made to rotary drilling when the well needed to take a turn.

How long did it take to drill a 12,000 ft hole?

The original estimate for completion of a 12,000-foot hole was 30 days using the conventional rotary technique, which was reduced to 13 days using the DTH method. Before DTH was used, drillers would typically case the vertical portion of the well and convert to rotary drilling to drill at a tangent.