HOW IT WORKS?
Water Well drilling signifies that a bore hole is drilled to produce water either for domestic or manufacturing purpose.
Most drill holes are for potable water which are carried out mostly in 3rd world countries
|Application||To drill holes to an aquifer in order tom produce water|
|Quality||Important to keep all materials and chemical correct for producing clean potable water|
|Drilling speed||Slow rotation speed 15 to 30 RPM, capable of between 6 — 15 M/hr|
|Hole depth||Usually governed by depth of aquifer|
|Hole size||Usually between 8” and 12” diameter|
|Flexibility||To be able to bring the water well hole into production|
|Cost||Cost varies due to depth and diameter required|
|Time||More time is used to develop the bore hole than to actually drill the hole|
|Technique||A drill rig should be a complete system usually mounted on a truck foe ease of moving long distance between holes.
Rig should be set up that there is no requirement for manual handling
|Challenges||To train sufficient operators and management in the area of producing water.|
|Products & Solutions|
Water well drilling is so called because it is used to drill holes for water, the system should be fully capable of recording the drilling parameters. The rig uses either a Down Hole Hammer or a Tricone bit (Rock Bit), this depending on the rig ability and the rock strength.
To set up the drill rig requires very little input as these holes by their very nature are vertical, once set up drilling commences with a Conduit casing inserted and made safe, The size will be determined by the hole finished diameter and what casing will be required to stabilise the top of the hole while the well is being established.
Drilling can be carried out by using Air Flush or Fluid Flush, both have their merits. Most holes are drilled by air flush up to a diameter of 8” usually going above 8” or larger and probably a deeper water well hole.
There are also two methods of recovering the cuttings, normally this come up the annulus and are controlled at the well head.
The other method is a reverse flush mainly using fluid, this method reduces the flush flow by bringing the flush up the internal area of the drilling pipe. For this method either a vacuum pump or a double tube drill pipe is use allowing air to be pumped down the annulus bring the cuttings up the center pipe.
Once the hole is drilled, then the permanent casing is installed with the gravel packs and seal system. The water well is cleaned and tested for production level.