Product Description
Drag Bits
Description:
A drag bit is simply a series of blades (usually three or four in
number) which produce a shearing action when rotated. They are
comparatively inexpensive due to the lack of moving parts and they
can penetrate softer formations such as stiff clays and mudstones
very quickly.
The drag bit usually used in very soft to medium formation when the
dth hammer as the tricone bit, lose of their effectiveness.
The cleaning of the hole is realized by the injection of air or
water.
There are two forms of drag bits:
- "Step" type for soft grounds
- "Chevron" type for medium hard grounds
Drag bits come in two designs: step and chevron. Step drill bits
are designed to drill soft to medium formations while chevron type
bits are forharder formations.
STEP DRILL BIT
A step drill bit is used for drilling overburdens withsands, clays
and soft formations. These bits will produce larger cuttings than a
Chevron style bit.
Because the step drill bit is more aggressive than the Chevron, ROP
will be higher. However, it will be less durable as well.
Rotary table speed should be between *0 and *0 rpm with light
weight on bit (WOB).
CHEVRON DRILL
BIT
Chevron drill bits are used for drilling more abrasive formations
like soft sandstones and shales.
The Chevron style bit is more durable than the step drill bit but,
because of cutting structure, will penetrate more slowly.
Rotary table speed should be between *0 and *0 rpm with light to
medium weight on bit (WOB). Harder formations require more WOB.
3 WING OR 4
WING?
Simply put, 4 wing bits are the most durable AND have the lowest
ROP.
When making a decision on which bit to buy, however, don't purchase
a 3 wing just to be able to drill faster. Always remember that
damaged carbide cutters slow penetration rates.
Additionally, 4 wing bits are more stable and tend toward drilling
a straighter hole.
Drag
bits Specification:
|
Item
|
Drag bit
|
|
Keywords
|
Step drag bit, Step drag bit products, ,carbide drag bit,
drag bit,chevron drag bits ,
|
|
Certificate
|
API&ISO***1:***8
|
|
Type
|
Chevron and Step type
|
|
Wings
|
2, 3 and 4 wings
|
|
Size
|
3" to *4" or as required
|
|
Thread
|
2 3/8, 3 1/2, 4 1/2, 5 1/2, 6 5/8 API Reg. Pin
|
|
Package
|
Wooden case or as required
|
|
Target
|
High quality with reasonable price
|
| Country: |
China |
| Model No: |
-
|
| FOB Price: |
(Negotiable)
Get Latest Price
|
| Place of Origin: |
- |
| Price for Minimum Order: |
- |
| Minimum Order Quantity: |
1 Piece |
| Packaging Detail: |
wooden case or as require |
| Delivery Time: |
- |
| Supplying Ability: |
- |
| Payment Type: |
L/C, T/T |
| Product Group : |
- |
