Sign In | Join Free | My
Hunan New Diamond Construction Machinery Co., Ltd.
Hunan New Diamond Construction Machinery Co., Ltd.
Home > Tricone Drill Bit >

8 1/2" 635 Oil And Gas Tricone Drill Bit 216mm Dia Abrasion Proof

Hunan New Diamond Construction Machinery Co., Ltd.
Trust Seal
Verified Supplier
Credit Check
Supplier Assessment

8 1/2" 635 Oil And Gas Tricone Drill Bit 216mm Dia Abrasion Proof

Brand Name : New Diamond
Model Number : 8 1/2" 635 216mm Tricone drill Bits
Certification : ISO9001:2008
Place of Origin : Hunan, China (Mainland)
MOQ : Negotiable
Price : Negotiable
Payment Terms : L/C, T/T, Western Union
Supply Ability : According to order quantity
Delivery Time : 5-8 work days
Packaging Details : Carton packaging and wooden box packing
IADC Code : 635
Circulation Type : Jet Air
Pin Connection : 4 1/2”API
Metric Bit Diameter : 216mm
Product Weight : 38KG
Weight on Bit : 25,500-51,000Ibs
Contact Now

Drilling pressure is a necessary condition for bottom hole rock breaking. The size of the weight-on-bit determines the method and characteristics of rock breaking, which directly affects the drilling speed and the method of bit damage. During drilling, the drill bit is subjected to axial pressure and reversing force. The cutting teeth are worn, dull or damaged during the process of pressing and shearing the rock, which will inevitably affect the drilling speed. With the addition of weight-on-bit, the drilling speed will continue to improve, and the drill bit bearing and cutting teeth and other components will speed up wear and tear, affecting the penetration rate. The relationship between weight-on-bit and penetration rate has changed for three different periods.

During the appearance of crushing: when the weight on bit is less than the hardness of the rock, the cutting tooth can not cut into the rock, but can only crush the rock by friction method and wear on the cutting tooth greatly, though the drilling rate is also proportional to the increase of the bit-pressure Add, fatigue crushing period: When the weight on the drill press close to the rock into the hardness, although not cutting into the rock cutters, but in the rock face attack more cracks, the cutting teeth through the repetitive effect, but also the onset of volume crushing;

During the volume crushing, when the weight on bit is added to more than the rock press-in hardness, the cutting teeth cut into the volume of rock fragmentation, the drilling effect was significant before it is normal drilling. Therefore, it is necessary to be satisfied with the weight-on-bit applied to the roller cone bit that the cutting tooth can press into the rock and cause the volume of the rock to crumble.

After doubled the weight-on-bit test, the experimental roller cone bit was drilled to different grades of rock. The results showed that different rock types did not have the same penetration rate for increasing the weight-on-bit. In the meantime, the rate of drilling in medium-hard rock formations (rock grades 6-7) was relatively high, whereas relatively soft (rock grades 4-5) and hard (rock grades 8-9) . Drilling into the soft rock, easy to attack the water paste, drill bit pressure should be selected smaller. Drilling into the more abrasive formations, the lack of bit-pressure drill bit easy to form early wear-bit weight to be properly increased. Drilling fractured rock formation, prone to jumping, drilling pressure should be properly reduced to prevent collapse, cut cut teeth. The weight-on-bit is an important parameter for drilling. That is to say, it is necessary to give full play to the ability of the cutting teeth to cut into the rock formation and to reduce the wear of the cutting teeth maximally.


1.Tailored insert shapes and grades manufactured using state-of-the-art tungsten carbide technology for different formations having varied drillability and compressive strength,to provide an optimum match beteen inserts wear resistance and toughness.
2.By using computer simulation of the rock bteaking at the bottom of the hole,Shareat’s engineers are able to design the best inserts space to ensure the most balanced load on each insert.
3.Double rows of gage inserts For better maintaining full gage hole.
Based on the calculating of the load distribution on the bearing components,all shareate bits incorporate bearings that have optimal geometry and load distribution designed to give maximum bearing life.

1.Non-Sealed Bearings

Bearing Type:Roller-Ball-Roller-Thrust Button without seal.

2.Sealed Bearings

Bearing Type:O-Ring Seal-Roller-Ball-Roller-Thrust Button. See

·The seal keeps the mud,cuttings,air and water ouside the bearings.

·The bearing works in lubricant and friction conditions,this results in less bearing wear and longer bearing life.


1.Conventional Shirttail DesignThis shirttail features a”terraced”design,which increases escape area and the bailing velocity and decreases cuttings regrind and wear on shirttail and shirttail lip.

Hardmetal and wear resistant carbide were applied to shirttail and shirttail lip.

2.Particular Shirttail Design

This shirttail features a”terraced”design,which increases eacape area and the bailing velocity and decreases cuttings regrind and wear on shirttail and shirttail lop.

Hardmetal was applied to shirttail lip and lug.Wear resistant catbide on shirttail lip and lug and around the”terrace”lower part of shirttail lug.


·Please select the applicable formation and parameters according to the instructions.

·Carefully check the bits appearance and to check the bits threaded end face,whether the serial number on the box and certificate.

·Selection of WOB and RPM should be within the limits of the recommended parameters, higher WOB and RPM cannot be used simultaneously.

·Bottom hole must be clean and bit must not be used for long section reaming.

·Drilling process must operate smoothly, find that there is Bie jump on abnormal phenomenon, should be timely analysis and take effective measures

·The bit should be kept indoor with dry and well ventilated conditions at 10-33℃ and kept from sunshine and rain. Stored under such conditions, quality of bit is guaranteed for 3 years.


Bit DiameterIADCApplicationsSpecial Features(Cutting Structure,Lug Protection)WeightPIN ConnOperating Suggestions WOB/RPM
8 1/2” 216mm635Medium-hard and abrasive formations with high compressive strengths.Coical on gage and inner rows;Hardmetal on lug;Wear resistant carbide on shirttail lip and lug.84384 1/2”API25,500-51,000Ibs/100-60RPM

Feature Advantage

1.Price commitment: in order to ensure the high reliability of products, raw material selection are using grapefruit brand products; under the same competitive conditions, and not to reduce product technical performance on the basis of sincerity at a favorable price to customers.

2.Quality commitment: product manufacturing and testing have quality records and inspection data; the performance of the product can withstand customer inspection.

3.Customer service: in order to create new diamond brand, enhance the visibility of enterprises,establish corporate image, we serve customers with the principle of "preferential prices, good service, reliable product quality" principle.

The appearance of the picture is different from that of the actual product, and the actual product is the standard.

Product Tags:

milled tooth drill bit


roller cone drill bit

China Customized Inflatable Bumper Ball Game Bubble Adult Grass CE supplier

8 1/2" 635 Oil And Gas Tricone Drill Bit 216mm Dia Abrasion Proof Images

Inquiry Cart 0
Send your message to this supplier
To: Hunan New Diamond Construction Machinery Co., Ltd.
Characters Remaining: (0/3000)