Tricone Roller Cone Bit for Mine Quarry Rock Drilling Tools
Roller cone bit classification
Roller-cone bits are generally classified as either tungsten
carbide insert (TCI) bits or milled-tooth bits.
To assist in comparison of similar products from various
manufacturers, the International Association of Drilling
Contractors (IADC) has established a unified bit classification
system for the naming of drill bits.
IADC roller-cone bit classification method
The IADC Roller-Cone Bit Classification Method is an industry-wide
standard for the description of milled-tooth and insert-type
roller-cone bits.
This coding system is based on key design- and application-related
criteria.
The currently used version was introduced in 1992 and incorporates
criteria cooperatively developed by drill bit manufacturers under
the auspices of the Society of Petroleum Engineers.
IADC classification
The IADC classification system is a four-character design- and
application-related code.
The first three characters are always numeric;
the last character is always alphabetic.
The first digit refers to bit series, the second to bit type, the
third to bearings and gauge arrangement, and the fourth
(alphabetic) character to bit features.
Series
Series, the first character in the IADC system, defines general
formation characteristics and divides milled-tooth and insert-type
bits. Eight series or categories are used to describe roller-cone
rock bits.
Series 1 through 3 apply to milled-tooth bits;
series 4 through 8 apply to insert-type bits.
The higher the series number is, the harder or more abrasive the
rock type is.
Series 1 represents the softest (easiest drilling applications) for
milled-tooth bits;
series 3 represents the hardest and most abrasive applications for
milled-tooth bits.
Series 4 represents the softest (easiest drilling applications) for
insert-type bits,
Series 8 represents very hard and abrasive applications for
insert-type bits.
Unfortunately, rock hardness is not clearly defined by the IADC
system.
The meanings of “hard” sandstone or “medium-soft” shale, for
example, are subjective and open to a degree of interpretation.
Thus, information should be used only in a descriptive sense;
actual rock hardness will vary considerably, depending on such
factors as depth, overbalance pressure, porosity, and others that
are difficult to quantify.
Type
The second character in the IADC categorization system represents
bit type, insert or milled tooth, and describes a degree of
formation hardness.
Type ranges from 1 through 4.
Bearing design and gauge protection
The third IADC character defines both bearing design and gauge
protection.
IADC defined seven categories of bearing design and gauge
protection:
- nonsealed roller bearing (also known as open bearing bits)
- air-cooled roller bearing (designed for air, foam, or mist drilling
applications)
- nonsealed roller bearing, gauge protected
- sealed roller bearing
- sealed roller bearing, gauge protected
- sealed friction bearing
- sealed friction bearing, gauge protected. Note that “gauge
protected” indicates only that a bit has some feature that protects
or enhances bit gauge. It does not specify the nature of the
feature. As examples, it could indicate special inserts positioned
in the heel row location (side of the cone) or diamond-enhanced
inserts on the gauge row.
Included features
The fourth character used in the system defines features available.
IADC considers this category optional.
This alphabetic character is not always recorded on bit records but
is commonly used within bit manufacturers' catalogs and brochures.
IADC categorization assigns and defines 16 identifying features.
Only one alphabetic feature character can be used under IADC rules.
Bit designs, however, often combine several of these features.
In these cases, the most significant feature is usually listed.
Certifications:
Package & Shipment:
FAQ:
| Q: You are a trading company or manufacturer ? |
| A: Manufacturer, We are a 100% real factory with over 10 years' experience in
water/oil/gas wells Drill Bits. |
|
| Q: How about your products ? |
| A : Both of tricone bits and PDC bits strictly conform to API 7
requirements and ISO9001. we will do kinds inspections before
delivery, also cover for after-sales service. |
|
| Q: Package Methods ? |
| A: Normally wooden case, also can be steel box; can be customized
if need. |
|
| Q: Payment Terms ? |
| A: we accept T/T, L/C, Paypal, Western Union, etc. |
|
| Q: Can I visit your factory ? |
| A: Yes, we welcome you to our factory all the time, will send
invitation letters if need; also can show our workshop and
warehouse online. |
