Many of our friends who work with rotary drilling rigs may not be familiar with Quaternary soil layers. Actually, we encounter this type of geological formation frequently when using rotary drilling rigs. Quaternary soil layers are softer strata such as surface soil, silt, clay, silty clay, sand, and sand layers. So how do we drill in these geological conditions? Let's take a look.#hole drilling equipment#
Because Quaternary soil layers share a common characteristic: they are relatively loose, friction drill rods and rotary drill buckets can be used when drilling with a rotary drilling rig. Surface soil, silty clay, and clay layers have good cementation properties in dry conditions. In dry hole drilling, a single-bottom-plate soil layer drill bucket can be used, or a double-bottom-plate sand-retrieving drill bucket and a soil layer auger can be used. In wet hole drilling conditions, because the cementation properties of the soil deteriorate when exposed to water, a double-bottom-plate sand-retrieving drill bucket is generally used to facilitate the removal of drill cuttings. Silt layers are generally drilled using a double-bottom-plate sand-scooping drill bit. Sand and soil layers have poor cementation properties, and both dry and wet drilling methods utilize a bottom-plate sand-scooping drill bit. For easily collapsible strata such as water-rich quicksand and mudflow, a double-bottom-plate sand-scooping drill bit is also used.
The above information from Kaiao, a manufacturer of small rotary drilling rigs, explains the meaning of Quaternary strata and their geological characteristics, including how to select the appropriate drill bit for such geological conditions. Our rotary drilling rig operators can use the methods described above for drilling in these strata, resulting in higher efficiency.#hole drilling equipment#
