Advantages And Disadvantages Of Roller Drill And Classification

The tooth wheel bit is the most widely used drilling bit. The cutting teeth alternately contact the bottom of the well when the bit is in operation, so the rock-breaking torque is small, the contact area between the cutting teeth and the bottom of the well is small, the specific pressure is high, and it is easy to eat into the formation; the total length of the working edge is large, so the wear is relatively reduced. The total length of the working edge is large, thus reducing wear.

Advantages and disadvantages of dental wheel drills

1. Advantages of tooth wheel: The teeth of the tooth wheel alternately contact the bottom of the hole, the breaking torque is small, the contact area between the teeth and the bottom of the well is small, the specific pressure is high, and the crushing capacity is strong; the total length of the working edge is large, thus the wear is relatively reduced. Steel tooth tricone bit is very popular among our customers.

2. Disadvantages of tooth wheel: high cost, single-side wear due to bearing damage, long replacement welding time, and sometimes the phenomenon of paste drilling head; rotary drilling rig rarely uses nozzle function, and there may be secondary crushing of rock chips produced by human rock.

Tooth wheel drill classification

As one of the leading PDC bit suppliers, we would like to share with you information:

a. Seal type: the tooth wheel seal is divided into rubber seal and metal seal. hughes company obtained the patent of metal seal of tooth wheel drill bit in 1988, and continuously improved. In recent years, on the basis of SEM single metal seal, a new generation of metal seal (SEMI) has been developed, with special metal surface strengthening treatment, which improves the structure of the sealing system, significantly increases the sealing efficiency, extends the life of the drill, and can improve the reliability of the whole bearing system. The performance of metal seal is significantly higher than that of rubber seal. Rotary drilling rig should pay attention to the type of seal when selecting and installing the tooth wheel drill. In addition, when welding the tooth wheel, to prevent high temperature and heat transfer damage to the rubber seal, pay attention to the welding process, take cooling measures, etc. And we can provide a reasonable and competitive pdc bit price.

b. Bearing type: It can be divided into rolling bearings and sliding bearings. Sliding bearing mainly refers to the sliding bearing instead of the large shaft roller bearing of the tooth wheel drill. Its structure is sliding bearing ball bearing-sliding bearing. The sliding bearing changes the line contact between the tooth wheel and the roller into the surface contact of sliding friction, thus making the pressure-bearing area greatly increased and the specific pressure greatly reduced, meanwhile, there is no impact effect of the roller on the journal. As the roller column is removed, the journal size can be increased, and the light of the wheel can be increased, so as to improve the strength of the shaft, which is conducive to increasing the drilling pressure, and greatly improve the working life of the missing head: while the rolling bearing is characterized by high speed and low shaft pressure, the rotary drilling rig uses a tooth wheel bit basically for medium-hard or hard rock formations, so it focuses more on the drilling pressure, that is, the high load capacity of the sliding bearing. In addition, there is a kind of roller-slide composite bearing tooth wheel, which significantly improves the ability of the bearing to adapt to high speed while maintaining the high bearing capacity of the sliding bearing.

c. Inserted tooth type: In the tooth ring of the outer taper of the tooth wheel drilled, inserted with different sizes and shapes of carbide drilling teeth. The hardness and wear resistance of carbide teeth are higher than steel teeth, and the service life is longer, especially for crushing abrasive hard strata, so the inserted teeth type is the mainstream configuration of rotary drilling rig.

d. Milling type: steel teeth are milled directly from the cone of the tooth wheel, mostly wedge-shaped teeth.

e. Single tooth wheel: single tooth wheel, rotary drilling rig mainly applies single palm tooth wheel, mainly used in non-full section tooth wheel cylinder drilling.

f. Triple tooth wheel: the rows of long intermeshing on the three tooth wheel drill bit prevent the tooth groove from gluing teeth. Oil drilling applications are more, but the application of press, political and not repeatedly full crushing hole bottom rock wells, but rotary industry applications with less, can be applied to the guide teeth to prevent deviated holes, or applied to the tooth wheel cartridge drilling to enhance the chances of large hole diameter coring.