Tricone bit, borehole bit 3 7/8"

Specifications

A Series Bit for Air Drilling  Used In Hard Formation

1.Good quality &after-sale service 

2.Extensive industrail experience

3.ISO certified

4.Size:   5 7/8" to 12 3/8"

Structural features

In hard formation with less water content,formations with serious leakage or with low pressure,in order to achieve higher drilling speed,air drilling process is usually adopted.

Problems such as short service life,low ROP,weak gage protection ability,etc. appear frequentely for conventional cone bit in air drilling conditions.Aim at air drilling condition,we have developed A series bit for air drilling which can solve these problems.

The size range of A series bit is from 5 7/8 to 12 3/8 inch,and IADC varies from 537 to 627.

For example:8 1/2 A617HD.

LONG SERVICE LIFE

Metal face seal journal bearing 

High stress spots are eliminated by new bearing enhancement process and the design requirement of high accuracy is obtained with high precision machineries to ensure good impact resistance load capability and high-temperature resistant property.

HIGH ROP

High effective cutting capability can be obtained by optimized cutting structure

According to characteristics of air drilling,inserts of highly wear resistence and high toughness as well as optimized cutter shape are utilized.The wear-resistance and anti-breakage ability of inserts can help to keep constant aggressiveness and increase ROP.

Fine cutting is suitable for upward flow of cuttings in air drilling to reduce repeated breakage and improve drilling efficiency by optimized arrangement density and height of cutters.

Jet system with high efficiency

Three side jet holes and one center jet hole form a jet structure.Unique centre hole will spurt air flow into bottom hole center directly,so that increase capacity of cleaning well bore,expedite upward flow of cuttings and cool cone and bearing.

STRONG GAGE PROTECTION.

Appropriately added cutter's number of heel row and adopted inserts with good wear-resistance to enhance gage protection.

Widened & thickened hardfacing on shirttail to protect the seal.

Full head OD protection to improve further capability of gage protection.

OPTIONAL FEATURES:D,H,X,Y