Auger drilling refers to one of the types of rotary drilling. The term "screw" itself comes from the word "Schnecke", which in German means screw, curl, snail.
Features of work performance
This type of drilling differs significantly from other types, in particular, in that during this work, the destroyed rock is removed and transported through the well not by the flow of a cleaning agent, but due to the rotation of the column.
Auger drilling is very widespread, is a universal method used for drilling shallow holes in soft or unconsolidated rocks. This method is convenient for performing work in pebble rocks. It is also widely used in seismic exploration, blasthole development, hydrogeological engineering surveys, geological surveys, and mineral prospecting.
Drilling technology
Drilling augers loosen and crush the rock during operation, and then move the resulting product to the wellhead on a special screw conveyor. The technology of work includes three main points. These are: the process of cooling the tool involved in the destruction of the rock, transporting the product of destruction to the surface and strengthening the walls of the resulting well with lifted rocks.
Auger drilling is done with a drilling tool. There are three types of technological tool. Drilling equipment is a column of conventional augers with a chisel, a magazine auger with a crown, ordinary and hollow columns with a removable chisel and a removable core receiver.
Widely used to work with loose rocks two- or three-blade chisel with flat or spiral blades. When auger drilling is performed in medium hard formations, higher wear resistance is required, so a rounded carbide loaded bit is used.
High-tech special installations are used during the work. The speed of drilling is huge, so the requirements for installations are mobility and high transportability. Installations are made portable or self-propelled.
The main positive feature of auger drilling is the involuntary self-fixation of the walls of the well by destroyed rock when it is lifted along the augers, as it is, as it were, "rubbed" and creates the effect of a kind of plastering.
Note that this process is a high-tech, but at the same time quite simple in organizational terms, method of underground workings, which minimizes the risk of collapse during operation. Auger drilling canalmost always, regardless of the time of year. At the same time, surface deformation is insignificant, which is very important when working under railways and roads, buildings and utility structures.
A noticeable advantage of the work is a fairly high speed, simplicity and little damage to infrastructure and the environment.
Specialists from all over the world note the constant interest in this drilling method and predict good prospects for its development.
