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.
| Product Specifications |
| Diameter | 8 1/2'' |
| Bearing Type | Rubber sealed |
| Drilling cycle type | Mud circulation |
| Connection thread type | 2 3/8 reg pin |
| Operation Parameters |
| Rotary speed (r/min) | 140-60 |
| Weight on Bit (KN) | 131-347 |
About Us
Suzhou Energy Tool Co., Ltd.
a high-tech company formed by a group of drill bit experts with
over 20 years of work experience in the world's top oil service
companies.
ENG has cooperated with many research institutes at home and has
formed an advanced technological system based on market-oriented
and continuously promoting technological innovation and product
improvement.
ENG 'S bits production lines are equipped with 5-axis machining
centers, Modern lathes, and FMS (Flexible manufacturing system ) .
ENG has been keeping on pursuing producing high-quality products
with relevant inspections and tests.
The company's QMS has been certified by API, ISO 9001 for many
years.
Package&Shipping
Applications
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. |
