+86 10 8467 3566
+86 10 8467 3566
Mar. 17, 22
Water Well Drilling Machine
Drilling parameters are really important when it comes to achieving great drilling performance and extended equipment life. While it is important to choose the right equipment, once drilling conditions change, you need to adjust your parameters to maintain good drilling performance. Understanding how to adjust drilling parameters can help drillers improve performance in difficult drilling situations.
Drilling parameters include the rate of penetration, the rotation speed, the water flow, and the weight on bit (WOB) also known as feed pressure. All of these parameters work together to provide good performance. The gauges on your drilling rig are there to help you monitor situations and adjust the parameters as needed.
There should be a minimum of three gauges on a drill rig: water pressure, feed pressure, and torque pressure. They are integrated into the control panel.
The water pressure gauge on the drill rig indicates the amount of pressure in the circuit. Beginning at the pump, the water flows through the high-pressure line to the water swivel, through the drill rods, past the bit, and unless lost to the ground formation, it travels back up the hole and out the casing back on the surface. Many things can affect water pressure including but not limited to, the ground formation, the gauge of your diamond tools, inner tube adjustment, condition of the drill rods, drilling techniques, type and size of coring system, etc.
The water pressure gauge monitors these pressure changes, telling you what the in-hole pressure is. This pressure can be substantial (pressures can reach an excess of 1000 psi) so these circuits are complete with a high-pressure relief valve or “Pop Valve” to protect the driller and helper against high-pressure spikes while drilling
While you are drilling, you cannot change the water pressure – you can only monitor it, and you should be monitoring it closely. Water pressure is a telltale sign of what is going on down in the hole. For example, it spikes, this is an indication that something is blocking the water from flowing. There could be a core block that is forcing the water shut-off valves to push out and block the water flow. Of course, all of this only applies if you are drilling where there is water return.
Use good rod handling practices, including keeping a close eye on threads and ensuring good lubrication (this is your pressure line).
Keep your diamond tools in gauge. Use a go-no-go gauge or something similar to ensure the bit and shell are well within tolerance.
Use a mud program with good quality drilling additives as this will ensure good cutting removal, keep the bit cool and condition the borehole.
Torque pressure is the amount of force applied to make the drill string turn. As with the water pressure gauge, this is not something a driller can control, but only monitors. The torque pressure will also provide valuable information regarding conditions in the borehole because when the ground changes, the torque pressure can change as well.
For example, if you are drilling and your torque pressure is 1200 when you suddenly hit a clay seam. The torque pressure will increase to say, 2000 because the clay is preventing the bit from turning freely and the drill string is laboring hard to maintain the rotation speed and push on the bit. Similarly, if you hit a void, you will see the torque pressure drop because there is no pressure on the bit while is in a void.
This gauge represents the hydraulic force being exerted on the drill bit as it advances through the rock, usually in pounds per square inch (PSI). Unlike the other two gauges above, the driller is able to control the pressure instead of only monitoring it. This value comes from the cylinder or cylinders that push the bit into the ground.
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