Original title: What kind of formations are different rotary drilling bits
suitable for? Barrel drill, spiral drill bit and bailing bucket are commonly
used in the construction of rotary drilling rig, so what kind of strata are they
suitable for? Duff Equipment has sorted out the formation adaptation of some
rotary drilling bits and shared them with you. I hope it will be helpful to your
rotary drilling construction. Barrel drill At present, there are two kinds of
common core barrel drills: cutter barrel drill (suitable for medium hard bedrock
and gravel) and roller barrel drill (suitable for hard bedrock and large
boulders). In the two types of barrel coring drill, there are two types of bit
with coring device and without coring device, which mainly depends on the
difficulty of coring. Because the cone coring bit is mainly used for hard rock
drilling, and the annular area of drilling is large, if conditions permit,
reverse circulation drilling can be added to the bit part to improve the
drilling efficiency. In the soil layer with high compactness or some soft rock
layers,dth
rock bit, when the friction drill pipe is selected to cause slippage, the
barrel drill can be used to deal with it. Duff auger bit Rock-socketed auger bit
It is suitable for the crushing of boulders, boulders and hard rock strata in
the hole. For some clay strata and moderately dense pebble soil,mining dth bit, when the double-bottom
bailing bucket of the selected soil layer cannot be used for drilling, the auger
bit can be used for drilling. Double-bottom bailing drill bucket for soil layer
It is suitable for silt, fine sand, silt, silty clay, clay, some soil-like soft
rocks, Tapered
Rock Bit ,Mining Drilling
Equipment, such as fully and strongly weathered mudstone, moderately
weathered mudstone, argillaceous sandstone, etc., as well as hard rocks with
high degree of weathering, such as fully and strongly weathered granite, etc. It
is the most widely used bit in the industry. Duff pick double bottom bucket Pick
double-bottom bailing bucket It is suitable for pebble, gravel layer, moderately
weathered soil-like soft rock, such as moderately weathered argillaceous
sandstone, argillaceous conglomerate, etc. When drilling hard rock, it is often
used with barrel drill and spiral drill bit. It is difficult to drill hard
bedrock, large boulders and hard permafrost directly with auger bit or rotary
drill bit, so it is necessary to drill with barrel ring bit, auger bit and
bailing bit. It can be divided into coring annular barrel bit and non-coring
annular barrel bit. According to the different strata drilled, it can be divided
into pick ring bit for weathered bedrock and permafrost drilling and cone ring
barrel bit for hard bedrock drilling. The structural characteristics and
principle of the annular barrel type coring bit: the bucket body is divided into
two layers of an inner tube and an outer tube, the outer tube is welded with
main cutting teeth, the inner tube is welded with auxiliary cutting teeth, and
the lower end of the inner tube is provided with a hinge blade for supporting a
core. The drill bit and drilling tool shall be selected according to the
function configuration of the rotary drilling rig. If the rotary drilling rig
has the function of forming the trench of the underground continuous wall, the
hydraulic grab bucket or double-wheel milling machine can be selected to form
the trench of the continuous wall. If the auxiliary winch has the function of
automatic rope release, the percussive drill bit and the percussive grab drill
bit can be selected to drill large-diameter pebbles or boulders. Gas-liquid
drilling can be carried out if equipped with air chamber and swivel. If it is
equipped with double power head or pipe rolling machine,dth
drilling hammer, it can be used for casing drilling, which is a very
effective method for smoothly passing through quicksand, breaking gravel and
silt layers during drilling. Return to Sohu to see more Responsible Editor:. wt-dthtools.com