Drilling Methods

Direct Circulation Rotary

The Rotary method consists on crushing and wearing the lithological formations reducing them to small particles through the use of a circulatory trepan. The movement of this part is accompanied by the circulation of “muds” constituted by bentonite and water.

The function of these “muds” is to remove and bring the drilling debris to the surface, avoid the collapse of the walls because of the drilling, lubricate and cool the crushed parts.

This type of drilling is used and very advantageous when the geological formations are not consolidated. Our company does this type of drilling with direct circulation.

This efficient removal of debris allows for faster and more continuous drilling. The advantages of this method include:

• Speed and Efficiency

  The direct fluid circulation facilitates debris removal, speeding up the drilling process.

• Reduced Equipment Wear

  Continuous cooling and cleaning minimize drill bit wear, extending its lifespan.

• Adaptability

  Suitable for moderately compact soils, where fluid circulation supports a uniform drilling progression.

Rotary method diagram

Down-the-Hole (DTH) Percussion Hammer

The DTH Percussion Hammer method is based on the crushing and cutting of the layers by a drill driven by compressed air. This compressed air is produced from a compressor which is transmitted through the inside of the drill string.

We use this method only for consolidated formations and hard rocks and, because of the speed of drilling, the cost is lower than through the rotary method. Besides, using this method it is possible throughout the course of the work, to have an approximate idea of the various aquifers units that are going through.

The main features of this method include:

• Power for Hard Soils

  The combined action of rotation and percussion overcomes challenges posed by rocks and extremely compact soils.

• Control and Precision

  The use of the hammer ensures precise control of drilling depth and progression.

• Operational Continuity

  Effective fragmentation of the soil minimizes the need for cleaning interruptions, enhancing process productivity.

DTH Percussion Hammer method diagram

Choosing the Drilling Method

The choice between the drilling method is based on a detailed analysis of ground conditions.

At Sondagens Valente, each intervention is meticulously planned and carried out with the utmost precision, ensuring safe, efficient, and sustainable drilling operations.

Classification of aquifers by type of permeability