Boart Longear Wireline Coring Barrel NQ HQ PQ Q series head
Boart Longear Wireline Coring Barrel NQ HQ PQ Q Series Fishing
Tools For Drilling
Brief Introductions of overshot :
The overshot is used when wear and other mechanical damage prevent
the use of the regular pulling tool . We can produce overshots
assembly of all wireline and Chinese standards .
Our overshots are consisted of lifting dogs , jar tube and
swivel.Owing to large amount of stocks,the products can be shipped
out immediately according to your requirements .
1. Wireline Core Barrels
2. Ideal for use in most drilling conditions
3. Available for application in standard DCDMA hole size
When the driller wants to remove core from a conventional core
drill, the entire core barrel has to be removed from the hole. This
is time-consuming, as each rod has to be removed one at a time.
With wireline drilling, a barrel of core can be removed from the
bottom of the hole without removing the rod string. When the
driller wants to remove the core, an overshot is lowered on the end
of a wireline. The overshot attaches to the back of the core barrel
inner tube and the wireline is pulled back and the inner tube
disengages itself from the barrel.
Double core tube and tube has outer pipe, rinses through joint
between the internal and external tube water flow to the bottom of
the hole, protecting cores from rinses washouts. Double core tube
has double motion and single movement two kinds. Double motion and
core tube is internal and external core tube following bit and
drill stem rotation, it in no serious loose or broken strata.
Single movement double core tube internal and external tube has
bearing isolation, pipe outer pipe driven only pick up bit
rotation, and broken rock tube does not rotate, avoid to core
friction, vibration, etc., with mechanical damage, so it in serious
loose fractured formations. these, can be well protected cores.
Use double deck core tube take core, bits need to use wall
thickness of the alloy drill or diamond bits.
Due to the rock drill contact surface area increased and the lip
use double deck core tube than ordinary core tube drilling
efficiency to reduce. In the ledge, coal, in order to guarantee
rock (mineral) heart take rate, rules must be use double deck core
tube coring. More complex double core tube, except to finish single
movement, in addition, aluminum, steel tube placed plastic or
qualitative buckled half close tube, have a better protection of
the core role.
Accessories of Over Shot
QTY per set
Cable Swivel Collar
Cable Swivel Body
Cap,Ezy Lock O/shot
Spring,Eay Lock O/shot
Sleeve,Ezy Lock O/shot
Ezy Lock overshot head
1) Strong magnetic field and strong attractive force .
2) Have multiple Functions .
3) Be convenient and safe in use .
4) Advanced designs and multiple choices.