Qingdao Nokunda Drilling Tools Co., Ltd.

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Qingdao Nokunda Drilling Tools Co., Ltd.  

 No. 15 Donghai Xi Road, Shinan District, Qingdao City, Shandong Province, China

Whatsapp: +86 13792983690

Wechat: +86 13792983690 

Email: [email protected]

 

 

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9 7/8" NGV535RF

9 7/8" NGV535RF
Product Name : 9 7/8" NGV535RF
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CUTTING STRUCTURE

 

Off-chisel on gage, conical on inner rows, with auxiliary carbide protection.

Designed for very soft formations with low compressive strength and high friability such as shale, soft limestone, sandstone, gravel clay, soft dolomite, coal ore.

Compressive strength: 6,000-9,000 psi/41-62 MPa

 

SHIRTTAIL PROTECTION

Hard Metal and wear resistant carbide protection on shirttail lip and lug

 

PRODUCT SPECIFICATION

IADC Code:  535

Bearing Type: Roller-Ball-Roller-Thrust Button / sealed Bearing

Circulation Type: Jet Air

Cutting Structure: 

Inner and Nose Rows: Conical

Gage Rows: off-Chisel

Auxiliary Carbide: Spherical

Gage Bevel Protection: Ovoid

Pin Connection: 6 5/8″ API REG

Metric Bit Diameter: 251 mm

Product Weight: 143 lbs/65 kg

 

OPERATING SUGGESTIONS 

Weight on Bit: 144,093lb/20.0T MAX.

Rotary Speed: 80-110rpm

Air Back Pressure: 29-58 psi/0.2-0.4 MPa

 

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