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Parameter

Description:

Parameter

Series: rubber rings-rolling bearings(SDMT¡Á¡Á¡ÁG)

Description:

Characteristic of bearing structure:

1. S.U.G SDMT¡Á¡Á¡ÁG series tricone bit use High precision journal bearing with two thrust faces. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. The load capacity and seizure resistance of the bearing is greatly improved.
2. Precise metal face sealed. The two dynamic axial sealing rings of the sealing system are metal seals, and two highly elastic rubber energizers are seated separately in head and cone sealing areas functioning as static seals. Optimized sealing compression ensures good contact between the two metal sealing faces at all times.

3. Ball locked cone, suitable for high rotary speed.

4. New type of wear resistant grease that can sustain high temperature up to 250¡ãC is utilized.

5. High wear resistance and excellent cutting ability of the insert bit are given full play by using carbide compacts of high strength and high toughness in combination with optimized compact numbers and rows, the exposure height and special shaped compacts. For steel tooth bit, the tooth surface is hardfaced with new type of wear resistant material and thus extended working life of the cutting structure while still maintaining high ROP.

Characteristic ofPredominance technology

S.U.G SDMT¡Á¡Á¡ÁG series milled tricone bit use the most advanced sealing technology of the world, i.e. the metal face seal (MFS). It can perform consistently in high speed drilling applications, and is the ideal tool for drilling directional and horizontal wells. In comparison with conventional rubber O-ring sealed bits, the average working life (total drilling hours) of HJ series bit under the condition of the same operating parameters can be increased by 35%.

S.U.G available sizes and types of SDMT¡Á¡Á¡ÁG series tri-cone bits

Bit size
Bit type

API Regular Pin
£¨in£©

Recommended make-up torque for bit shank£¨KN.m£©

Inch

(in)

Metric (mm)

8 1/2

215.9

SDMT127G

4 1/2

16.3¡«21.7

9 1/2

241.3

SDMT127G

6 5/8

37.9¡«43.3

12 1/4

311.2

SDMT127G

6 5/8

37.9¡«43.3
S.U.G recommended operating parameters of SDMT¡Á¡Á¡ÁG series roller cone bits

Bit type

Normal WOB
kN/mm
£¨bit dia.£©

Rotary Speed

£¨rpm£©

Cutting structure

Applicable formation

DMT127G

0.30¡«0.90

300¡«80

Hardfaced gage and all tooth surfaces, and the gage fitted with compacts for enhanced gage protection

Soft with low compressive strength and high drillability, such as shale, clay, salt bed and soft limestone, etc.

DMT517G

0.35¡«1.05

240¡«50

Large radius offset crested scoop compacts in inner row, wedge compacts in outer row, high compact exposure and inequable spaced compacts arrangement

Soft with low compressive strength and high drillability, such as shale, clay, sandstone and soft limestone, etc.

DMT537G

0.50¡«1.05

220¡«40

Large radius offset crested scoop compacts in inner row, wedge compacts in outer row, high compact exposure and inequable spaced compacts arrangement

Medium soft with low compressive strength and harder abrasive stringers, such as hard shale, hard gypsolyte, soft limestone, sandstone and dolomite with stringers, etc.

DMT617G

0.50¡«1.05

220¡«40

Large radius scoop compacts in inner row, wedge compacts in outer row and inequable spaced compacts arrangement

Medium hard with high compressive strength and thick & hard stringers, such as limestone, hard shale, mudstone and sandstone, etc.
E: The upper limits of WOB and RPM recommended in above table should not be used simultaneously.