A few drill techniques are being used by various industries today. When you drill a borehole, you will encounter a sundry of rock layers and different kinds of sediments. To successfully and seamlessly drill through them, an array of manual techniques in drilling have been developed. Fortunately, all of them are currently used in many different drilling applications.
Each of those drilling techniques needs to cut or break through the ground layers.
After this, the cut or processed through ground material needs to be taken away from the hole. There would be occasions also when it is highly necessary to give support to the walls of the hole to keep it still and stable, and thus prevent it from collapsing while drilling work is in progress.
These drilling techniques were developed either just for one or various types of rocks and specific sediment. There are also circumstances that complementary drilling techniques are applied together with other drill techniques for a single borehole. These drilling techniques we have today are classified in the following drilling principles.
The hand auger type of drilling method comes with extendable steel rods. You operate them by rotating a handle, and then at the bottom part of it, you can attach an array of steel drill bits. The augers will then need to be rotated until they get filled. To empty them, they need to get lifted out of the borehole.
It is very possible to make use of different drill bits for each type of sediment you will encounter. As for the borehole, it will generally remain open sans requiring any kind of support.
To bring the cuttings up to the surface in sludging you will need to take advantage of water circulation. In an up and down motion, you will see the drill pipes will go. The drill bit impact on the downstroke will loosen up the soil but when taking on the upstroke, the upper part of the pipe will be closed by hand. This causes the water to be drawn up via the pipe, then eventually taking the cuttings to the surface.
With percussion type of drilling, what happens is that the hammering bit will be attached securely first to a cable or a rope, then it will be dropped multiple times into the open hole. This can also be a type of temporary casing where tripod may be taken advantage of to be used as a supporting tool.
When you move the rope or the cable in an up or down fashion about a meter, the hammering bit will loosen up the consolidated rock or soil in the borehole. Eventually, this will undergo the process of extraction with the help of a bailer.
Much like with hand augering, temporary steel or plastic casing can be used to make the hole stable and thus keep the possibility of it collapsing at bay. After installing the permanent well screen and casing, the temporary casing will have to be removed. Most of the time, a manual percussion drill is taken advantage of to a depth of around 25 meters to the ground.
Jetting is the last of the drill techniques we want to feature here. Much like the others, this method of drilling is also based on water pressure and water circulation. Unlike sludging, you will need to pump the water down the drill pipe. This action will render the cuttings and the water to be transported to the hole that is between the borehole wall and the drill pipe. To have an adequate amount of water flow, a motor pump may offer substantial help here.