8.5in PDC drill bit 6 blades

Welcome visit hengji bit company 

We have all size of tricone bits,PDC bits,core bits,steel tooth bits,insert tricone bits,single cone bits,hole opener,assemble tricone bit,etc. Suitable for soft to hard formations.

        8.5inch 6 blades PDC drill bit    

1, 

 The advantage:

Cutting structure

The wear-resistance of teeth is enhanced with premium tungsten carbide hardfacing on the tooth surfaces for steel tooth bit.The durability of premium tungsten carbide inserts is improved with new formulas and new techniques for insert bit.

Gauge structure

Multiple gauge protection with gauge trimmers on the heel and gauge inserts on the gauge surface of the cone ,tungsten carbide inserts and hardfacing on the shirttail increases gauge holding capability and bearing life.

Bearing structure

High precision journal bearing with two thrust faces.Balls lock the cone.The leg bearing can get larger by arranging the rollers in groove of the cone hole,so it can receive mor WOB ,and suitable for high RPM.Thrust faces hardfaced with wear resistant alloy.Abrasion resistance and seizure of the bearing are improved.

Seal and Lubrication

Premium HNBR O-ring,optimal seal compression and curved seal structure can enhance seal performance. The pressure compensator system and advanced grease can greatly increase the lubricating reliability.

Product application

It can receive higher WOB and faster rotary speed than conventional roller bearing bits.It is suitable for high RPM applications.

 The process:

 The cataloge

2,                                Application for bit

In Petroleum & Gas ,Water well ,Mining and Tectonic Industries ,Oil field, Construction, Geothermal, Directional Boring, and Underground Foundation work.

3,product introduction: 

 1, Tricone bit

                                           The bit structure

Cone bit is composed by cutting structure, bearing structure, the locking element and oil sealing device,  nozzle device, more than 20 kinds of parts .

The leg material is 15CrNiMo,a tricone bit is composed of 3 legs.The cone material is 15CrNi4Mo.The tooth type is include steel tooth and insert tooth.Insert tooth is punch in outside of the cone.The steel tooth is milled from the cone directly.the tooth is engage each other,

Can break comprehensive rock effectively and without repeated  and prevent alveolar mudbag .

Bit tooth shape, size, quantity, depending on the drilled strata hardness, formation is soft, then the teeth larger and more pointed, the fewer quantity.

Bit Nozzle type:S-series, P-series,M-series.A bit uaually include 3 or 4 nozzles.Diameter7-14mm. It is fixed in the hydrophthalmia with circlip and sealed with O-ring.

Roller arrangement:

1,Non self washing no slide layout:suitable for hard formations.

2,Self cleaning does not shift shaft arrangement: suitable for medium formations.

Bearing of bit :

 Bearing structure  include Cone cavity, claw shaft neck, bearing the runway, the locking element . Each cone has large, medium and small and the thrust bearing ,toal four paybearing. Big, small bearings bear radial load; medium bearing used in locking and positioning;thrust bearing  bear axial load.

Oil lubrication sealing system:

Sealing system include two types : O-ring sealed ,metal sealed.

 operational principle :Oil pressure compensation system (the pressure transmission hole, pressure compensation film, oil etc.) to keep equilibrium  between the oil and fluid pressure in the well .When oil pressure reduce , oil in  storage cup is added  into bearing cavity in the effect of drilling fluid column pressure.When Oil pressure of  the bearing cavity increase, oil  fluid into the cup.So,well sealed is very important.

 Different tooth corresponding different formation

                                                                           operational principle of roller bit

1,Movement in the bottom of the well

Revolution:

Roller rotating along with a drill, clockwise

Rotation:

Teeth counterclockwise rotation around the axis, said rotation, counter clockwise

 Sliping:

The tooth  slip with respect to the bottom , including radial (axial) and tangential.

The longitudinalvibration

In the rolling process, the center ups and downs, so that the drill bit  do reciprocating movement up and down.

2,rock-breaking mechanism:

Shock ,crush;slip shear.

  Roller cone bit nozzle and assembly size 

Recommended roller cone bit make-up torque

Photos show:

2,Diamond drilling bit

 diamond pdc core bits for coal mining are the new bits with the characteristics of high wear resistance, high impact resistance, 

high penetration rate. After using on site, it is proved that PDC bits have advantages in high speed,deep footage, long life, 

steady work, few accident, good well bore quality when sneaking in hard or soft foundation. Company independently developed 

the PDC drill bits have reached more than 30 varieties of products to meet the needs of different strata.

PDC bits characteristics:

1. Uses outline optimization design, adapts in different strata.

2. Short parabolic crown, cutting force balance design structure, spiral knife wing, balance the bit force, improve 

impact resistance.

3. Uses the dynamic flow field technique of simulation, optimizes the drill bit water power design, strengthens the drill bit clean, cooling capacity and prevents the drill bit balling.

4. Using high performance compound piece combination , enhances the bit life.

packaging&Shipping:

 By sea,By air ,By train,By truck,and so on

1). By Express like TNT, DHL, UPS, Fedex, Aramex, suitable for small bits total weight less than 45kg

2). By Air, suitable for urgent orders, total weight exceed 45kg

3). By ship, suitable for large quantity, will take more shipping time

The certification:

shallow well, mainly consider the drilling speed and preventing the mud pack.

deep well,mainly consider the bit footage

When out of the well the outer cutter is broken heavily, should be selected with gage bit

In the ease of deviated section should use small and short cutter bit

In the selection of insert button bit, should use the wedge-shaped cutter

Diamond limestone, appropriate uses double bevel gear, projectile shape tooth bit

Shale more or drilling fluid density is larger, should be selected with a larger amount of slip drill

The formation of limestone, sandstone, should choose smaller slip bit

In drilling hard and high abrasive stratum, appropriate uses ball tooth, double cone tooth head.