Down The Hole Drill

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By Tabitha Mishra | Last updated: August 20, 2021
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.
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.
Usually, contractors working on a dirt bore would pack up and move on to the next dirt bore when they encountered rock, leaving the rock boring for another contractor to complete.
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.
DTH technique was used in well drilling exclusively to dig, accurate, vertical bores, and rotary drilling was used to turn the hole. The Directional DTH system, patented by Atlas Copco, was first used successfully in 2012 by drilling crews in the Marcellus Shale region of the United States to steer percussive drilling. Though the technology already existed, Atlas Copco succeeded in overcoming engineering challenges by modifying the design, such as:
Drilling in the gas plays of Appalachia in 2012 is a classic example where DTH pneumatic percussion drilling tools reduced the time and cost of a project in half. 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. With DTH, it was now possible to turn 2-4 degrees curves and drill the well’s tangent up to 30 degrees or greater averaging 300 feet per hour, where rotary drilling would progress 30-40 feet per hour.
The DTH system is easy and quick to adapt to a directional drill and is considered one of the best and most effective methods to drill high-quality holes that are stable and straight. It can be done on both hard and soft rock and is extensively used in the construction, oil and gas, and water well industries.
DTH equipment consists of a drilling hammer and a piston-powered by compressed air. As the drill string rotates, the drilling hammer strikes down on the rock. The drill bit receives its striking power from a piston inside the hammer that is powered by compressed air.
The driving medium i.e. compressed air is also the flushing medium. The flushing medium (in some cases, water is also used) is pressed down through the drill pipes, down-the-hole hammer and the drill bit. It is then forced back out of the borehole along with the cuttings through the annular gap between the drill pipe and the borehole.
Below are few of the many benefits associated with DTH drilling:
The DTH method is the most productive and cost-effective method. It is environmentally friendly, as it produces lesser noise and vibration compared to other drilling methods making it ideal for cities.
It also leaves a lesser carbon footprint as it uses low amounts of drilling mud and additives, reducing the amount of drilling fluid that needs to be recycled and disposed of, in turn reducing the number of trips required for disposal of used mud.
This technology will help contractors do more in lesser time at lesser cost and help keep ahead in a very competitive market.
Written by Tabitha Mishra | Civil Engineer, Technical Content Writer
Tabitha has a Bachelors Degree in Civil Engineering from Mumbai University, India, and is currently freelancing as a technical content writer. Prior to writing, she has worked as a site engineer and site manager for various building construction, building rehabilitation, and real estate evaluation projects.
Tabitha is also certified as a Primavera project management professional and is well versed with Auto CAD. In her spare time, she does private consultation for small-sized home builders and assists with plans and permissions.
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https://en.m.wikipedia.org/wiki/Down-The-Hole_Drill
Ориентировочное время чтения: 8 мин
Опубликовано: 21.12.2008
A down-the-hole drill, usually called DTH by most professionals, is basically a jackhammer screwed on the bottom of a drill string. The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or drilling mud). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuick Frères in Belgium and Ingersoll Rand in the USA in the mid-1950s.
Wikipedia · Текст по лицензии CC-BY-SA
https://www.trenchlesspedia.com/down-the-hole-drilling-method-explained/2/4550
20.11.2019 · A Brief History of Down-The-Hole Drilling DTH technique was used in well drilling exclusively to dig, accurate, vertical bores, and rotary drilling was used to turn the hole. The Directional DTH system, patented by Atlas Copco, was first used successfully in 2012 by drilling crews in the Marcellus Shale region of the United States to steer percussive drilling.
Leopard DI650i Surface Down-the-hole drill rig
YouTube › Sandvik Mining and Rock Solutions
YouTube › National Ground Water Association
Sandvik Down-the-hole hammer RH510 air flow
YouTube › Sandvik Mining and Rock Solutions
EVERDIGM DOWN-THE-HOLE DRILL RIGS_D700
https://www.rocktechnology.sandvik/.../surface-drill-rigs/surface-down-the-hole-drill-rigs
Our Sandvik Surface down-the-hole (DTH) drills offer the highest mobility, a smaller footprint and the ability to serve multiple sites. Equipped with powerful down-the-hole hammers, Down The Hole Rigs are designed for high-capacity rock drilling in quarries, opencast mines and rock excavation projects.
https://www.mincon.com/down-the-hole-drilling-the-mincon-philosophy
20.12.2013 · “Down the Hole” Drilling – The Mincon Philosophy December 20, 2013 A “Down-the-Hole” Hammer is probably the most important component on the drill rig and the DTH system holds many advantages over other alternatives, for instance: Rotary Drilling is fine for large diameter holes in softer more friable rock but less effective in hard rock or where small diameter holes are needed.
https://www.reldrill.com/down-the-hole-drills
The C620H Jack-less Down the Hole Drill is designed to drill holes ranging from a diameter of 4-1/2 inch (114.3mm) to 6-1/2 inch (165.1mm) to a maximum depth of 118 ft (36m). The C620H is built for high efficiency and productivity to drill in medium to hard Limestone, Dolomite quarries and Aggregate mines.
https://ygroadmachine.com/down-the-hole-drilling
Down the hole drilling is the use of an impactor and a drill bit that submerge into the bottom of the hole to impact and crush the rock. Small in size and light in weight, it is suitable for places where large and medium-sized drilling rigs cannot be operated and is convenient and flexible.
What kind of drill is down the hole?
What kind of drill is down the hole?
Leopard DI450 diesel-powered, down-the-hole (DTH) drill has excellent mobility, a smaller footprint and the ability to serve multiple sites. It is a machine trusted by mining and construction companies, and contractors engaged in pre-split and regular production blasthole drilling.
www.rocktechnology.sandvik/en/products/…
How long does it take to drill a hole using DTH?
How long does it take to drill a hole using DTH?
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.
www.trenchlesspedia.com/down-the-hole …
Which is down the hole drill rig does Sandvik use?
Which is down the hole drill rig does Sandvik use?
Leopard™ DI550 diesel-powered, down-the-hole (DTH) drill has excellent mobility, a smaller footprint and the ability to serve multiple sites. It is a machine trusted by mining and construction companies, and contractors engaged in pre-split and regular production blasthole drilling.
www.rocktechnology.sandvik/en/products/…
What kind of medium is used for down the hole drilling?
What kind of medium is used for down the hole drilling?
The driving medium i.e. compressed air is also the flushing medium. The flushing medium (in some cases, water is also used) is pressed down through the drill pipes, down-the-hole hammer and the drill bit. It is then forced back out of the borehole along with the cuttings through the annular gap between the drill pipe and the borehole.
www.trenchlesspedia.com/down-the-hole …
https://www.epiroc.com/en-au/products/rock-drilling-tools/down-the-hole-drilling-tools
Down-the-hole bits We offer a comprehensive range of DTH drill bits to match all conceivable applications. Each bit is made from quality alloy steel, and has been precision machined to produce a perfect body, heat treated to the required hardness, given surface compression for fatigue resistance, and fitted with precision buttons manufactured in-house.
https://www.rocktechnology.sandvik/.../leopard-di550-down-the-hole-drill-rig
Leopard™ DI550 Down-the-hole drill rig Leopard™ DI550 diesel-powered, down-the-hole (DTH) drill has excellent mobility, a smaller footprint and the ability to serve multiple sites. It is a machine trusted by mining and construction companies, and contractors engaged in pre-split and regular production blasthole drilling.
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Down-the-hole drill - Wikipedia
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Down The Hole Drills - DTH Drilling Rig Machine for Mining
Down The Hole Drill