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A Beginner's Handbook on Borewell Drilling Methods

By following various borewell prerequisites and techniques, borewell services will get the groundwater efficiently through drilling. Though they have to use experience and knowledge to get the ground level water, it is important to decide on the right method based on the groundwater capacity and location. Best borewell contractors in Chennai analyse, determine and arrive at the best budget-friendly option for the customers. The methods involved in drilling a borewell depend on the borewell's depth, geological condition, and cost factors. Professionals work on the above criteria and develop the best way to drill a borewell.

Methods Adopted by Borewell Contractors in Chennai

Drilling a new borewell will help people get groundwater or surfaced water for industrial and domestic water supply. Borewell contractors in Chennai look into soil, clay, hard rock, boulder and alluvial formation before drilling a new borewell by any method. The drilling cost is influenced by the location, soil condition and drilling methods. The most common borewell drilling is water well drilling which uses various methods like:

  • Rotary drilling
  • Cable tool drilling
  • Auger drilling
  • Hand-driving
  • Jetting
  • Hollow-rod drilling

A Detailed Explanation on Water Drilling Borewell Methods

Rotary Drilling

Rotary drilling a renowned well-drilling method used by borewell contractors in Chennai. The principle followed in this method is to use a drill stem that is 15 feet in length to rotate with drill pipe. A heavy stabiliser is attached to the end of the drill pipe. The large outside diameter of the stabiliser with a heavyweight maintains the drill hole to be straight. The drilling action is performed with the help of a fluid or circulating air and a rotating action breaks up the material. Reverse-circulation drilling is another effective method followed under rotary drilling.

Cable Tool Drilling

This method is also referred to as spudding or percussion drilling. It has cable tool rigs that enable the operator to use the casing's driving ability and rotary. It is a comparatively slower drilling method but simpler to operate with the help of borewell contractors in Chennai. The cable tool drilling method is less expensive than rotary drilling. It has a heavy drill string that raises and drops to make the drill hole. The bit at the bottom has a rope socket on the top which is suspended with a cable. Up and down drilling action is imparted to the drilling stem, which loosens the sand and breaks them down. The process is repeated until the desired depth is reached.

Auger Drilling

Auger drilling is carried out in places where the sand is predominantly made of glacial drift material. In most cases, auger drilling is used in the upper portions of the well, then completed by the cable tool method. The auger drilling method uses spiral augers, 5 feet long, whose stem is moved hydraulically by a rotary drive head. Borewell contractors in Chennai help maintain the equipment used in drilling procedures for better efficiency.

Also Read: A Complete Guide on Borewell Drilling


Hand driving is ideal when the groundwater is close to the ground surface, and when the sand is free of rocks and boulders. The hand-driving equipment is simple to install under the guidance of all home services and uses only low-cost materials. A hand auger is used in the drive point coupled with a 5 foot long galvanised casing. The casing is approximately one inch in diameter and has a drive cap on the top to provide a heavyweight to enhance the drilling process. If required, extra weight is placed, and then the raising and dropping action is performed.


Jetting method is best for sandy areas, and this technology is used in most portable and DIY drilling machines. The jetting method uses a stream of high-velocity water to break the formation materials. The chisel-shaped bit is attached to the end of the hollow drilling pipe, and when water exits from the nozzles at high pressures, they loosen up the material drilled. Borewell contractors in Chennai raise, lower and rotate the drilling machine thereby making the process easy.

Hollow-rod Drilling

Hollow-rod drilling is also known as the hydraulic-percussion method, which is an old drilling method. It is a time-consuming method but remains popular because it is cost-effective. It contains a 2-inch diameter hollow rod well with 4-inch casings and a few boulders. Drilling action is performed by lifting and dropping the drill stem. The working principle is similar to the jetting method, except that the chisel bit also has a ball check valve. In order to add weight to the drill string, the drill pipe is made of triple-wall thickness. The bit drops by rotating the drill string manually, and the ball check opens. Thereby, mud enters the hollow drilling rods. During the upstroke, the slurry gets discharged as the check valve closes. Borewell contractors in Chennai help clean the hollow-rod drilling equipment with reasonable service charges.

Other Drilling Techniques Used by Borewell Contractors in Chennai

The other effective borewell drilling techniques used by borewell contractors in Chennai are:

  • Downhole hammer

The downhole hammer method contains test holes, 6 inches in diameter using unconventional water-based drilling fluids. This method drills faster and deeper using compressed air instead of mud pumps.

  • Dual Tube Rotary

The dual tube rotary method can drill in tough conditions making quicker penetrations and straight holes with the help of the hydraulics technique.

  • Sonic

Sonic drill uses a special drill head transmitting resonant vibrations with rotary power to make the drilling action. Borewell contractors in Chennai can alter the frequencies to suit the geological condition. An advantage of the sonic drill is that it produces core samples with accuracy and detail.

  • Directional Drilling

Directional drilling is a type of angular drilling which deflects the drill bit. It is ideal for reaching land portions where drilling cannot be done. By making a pilot hole, the drill is back reamed so that the hole becomes large enough for the pipe.

The Bottom-line

With the above article, you must be now clear on the various types of borewell drilling methods adopted based on the geological condition of the soil and water. FastHelp home services offer premium borewell drilling service with great experience to execute the above methods quickly and effortlessly.

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