Environmental & Geotechnical Drilling


GEOTECHNICAL DRILLING

JED Drilling is a drilling company that provides geotechnical drilling services to a wide variety of clients. Both auger drilling and direct push drilling are used to drill for geotechnical and civil engineering purposes.

  • Direct push drilling includes several types of drilling rigs and drilling equipment that do not involve a rotating drill string. Instead, the drill string cuts through material to create a borehole by pushing or hammering. Direct push technology can also be combined with sonic (vibratory) methods to increase drill efficiency. Direct push rigs are usually utilized only for drilling through shallow, unconsolidated soil materials and very soft rock. Direct push drilling rigs include both cone penetration testing (CPT) rigs and direct push sampling rigs such as a Power Probe or Geo Probe. CPT rigs advance specialized testing equipment (such as electronic cones), and in ideal conditions, can achieve production rates of up to 250–300 meters per day. For direct push sampling rigs, the speed and depth of penetration is largely dependent on the soil type, the size of the sampler, and the weight and power of the rig. The advantage of direct push drilling is that, in the right soil type, it can produce a large number of high quality samples quickly and cheaply.
     
  • Hydraulic rotary drilling is an exploratory form of geotechnical drilling capable of penetrating the earth to depths of several kilometres. These drilling rigs involve large machinery and are used to look for oil or natural gas deposits. Drilling fluid (mud mixed with bentonite and barite) controls the downward pressure and also acts as a lubricant, coolant and stabilizer for the walls of the borehole. The combination of this hydraulic pressure and rotation of a carbide or diamond drill bit makes hydraulic rotary drilling an ideal form of drilling when exploring the earth for oil and gas.
     
  • Sonic drilling is a quick, straightforward form of geotechnical drilling. A sonic drill head vibrates at a high frequency resonance and is controlled by the drill rig operator to cater to the specific geological conditions. As the resonant frequency becomes amplified, material at the cutting face is turned into fluid by the vibrating drill bit. Sonic drilling vibrations can either be sent down the drill string to the drill bit or can originate inside the drill head itself. Either way, the vibrations do not affect the rest of the drilling rig due to an internal spring system.
     
  • Down-the-Hole (DTH) drilling is one of the fastest, most dominant methods of geotechnical drilling. DTH drilling has many applications, including water well, oil and gas, blast hole and foundation drilling. This is an energy efficient form of wide-hole drilling (in the hole range of 100-254 mm) that can be performed in both a downward and an upward direction. DTH drilling does not require guiding equipment, yet results in straight holes within a deviation of 1.5%. DTH drilling breaks down hard rock through the hammering action of a DTH hammer drill bit attachment. The small rock particles created by the drilling rig are blown from the borehole by the DTH hammer air exhaust. Drill pipes provide compressed air, feed force and rotation for the hammer, and are added on along the drill string as the hole deepens. In DTH drilling, direct striking of the piston on the bit and the guiding action of the hammer casing keep the drill bit straight and stable. This results in constant energy on the impact surface, regardless of changes in hole depth.

DTH drilled casings are one of the most common methods for foundations, reinforcement work, water well drilling and metropolitan work (i.e. bridges, utility lines, and building construction). The development of DTH drilling and the introduction of special drilling systems like Symmetrix have refined overburden casing systems and encouraged the utilization of new construction methods. DTH drilling is an efficient, multipurpose drilling system that saves both time and money.

  • Auger drilling 4-12 inch augers
  • Hollowstem 4 ¼ - 12 ¼
  • SPT (Standard Penetration Test)
  • Direct Push (Dual Tube) 2.5-4.5
  • DTH (Odex) 130mm
  • Air Rotary 4.5 - 12inch
  • Core Drilling
  • Laskey Coring
  • Shelby Tubes
  • Piezometers
  • Inclinometers

 

ENVIRONMENTAL DRILLING

JED Drilling is a drilling company that offers both auger drilling and diamond core environmental drilling.

Auger drilling is done by driving a rotating helical screw into the ground, the blade of which lifts up material through the borehole. Augers range greatly in size, with some augers small enough to mount on the back of a utility truck, and others large enough to sink piles for bridge foundations. Augers drilling rigs are generally used to drill into soft, unconsolidated material, or weak, weathered rock. Hollow stem augers are used to drill into soft ground where the hole will not stay open by itself. Situations where hollow stem augers are employed include environmental drilling, geotechnical drilling, mineral exploration and soil engineering. Solid stem augers and bucket augers are used in harder ground construction drilling and in some cases, are used for digging mine shafts. Augers are a fast and affordable form of environmental drilling.

Diamond core drilling (exploration diamond drilling), as the name suggests, uses a hollow drill rod attached to a diamond-impregnated drill bit to remove cylinders of material. These cylinders of material are known as cores. Diamond core drilling bits come in a variety of sizes, and are made of fine, to microfine, industrial grade diamonds. The cutting ability and usage of these drill bits is determined by matrix hardness, diamond size and dosing. Drill bits of hard steel with a low diamond count are ideal for softer, highly fractured rock, while softer steels and high diamond ratio are good for coring in hard, solid rock. Lubrication, cooling, and removal of drill cuttings are facilitated by holes within the bit that deliver water to the cutting face.

In general, diamond drilling is a slow form of environmental drilling for several reasons. Diamond drilling rigs are commonly used as far down as 1200 to 1800 metres. At these depths, material is mostly hard rock. Because of the hardness of the surfaces being drilled, diamond drilling rigs often need to drill slowly in order to lengthen the life of drill bits and rods, which are expensive and time consuming to replace. Not only is the actual core drilling slow, retrieval of the core is also a lengthy process. Core samples are retrieved with a core tube, a hollow tube placed inside the rod string, and an overshot tool attached to the end of the winch cable. The winch is retracted, pulling the core tube to the surface.

Diamond drilling rigs can also be part of a multi-combination rig. Multi-combination rigs are capable of operating in either a reverse circulation (RC) or diamond drilling role. This is a common scenario when mineral exploration drilling is being performed in a very isolated location. The rig is first set up to drill as an RC rig for the higher metres of material, then the rig is prepared for diamond drilling. This allows the deeper metres of the hole to be drilled without moving the rig or waiting for a diamond drilling rig to set up on the pad.

  • Auger drilling 4-12 inch augers
  • Hollowstem 4 ¼ - 6 5/8
  • Direct Push (Dual Tube) 2.5-4.5
  • Core Drilling
  • Air Rotary 4.5-12inch
  • DTH (Odex) 130mm
  • Shelby Tubes
  • Monitoring Wells 2-4 inch wells
  • Sonic Drilling
  • Split Spoons 1.5-4inch
  • De-watering wells 

 

MISC DRILLING SERVICES

  • Screw Piles
  • Rig Anchors
  • Seismic & Micro Seismic
  • Pre-drilling Piles
  • Grounding