Instruction

  Do the cutting edge of the bit is called the diamond bit.The drill is a one-piece drill bit, the whole bit no activity components, structure is simple, has high strength, high wear resistance and impact resistance ability, is the world's one of the three new technologies of drilling in the 1980 s.Field use shows that diamond bit drilling in hard formation, in the soft - more than speed and penetration, long service life, stable work, less downhole accident, well bore as well as good quality.Diamond bit not only use a long time, still can use again, returned to the factory repair of diamond bit to use and diamond bit use effect is the same as the factory, to a large number of drilling cost saving. 

Advantage

    Bit quality whether good or bad, bit type and formation lithology of adaptation, to speed up drilling speed and improve the single bit footage plays an important role.Drill more than a mouthful of oil and gas Wells typically use different size of the drill, the drill and the diameter of upper strata to use the drill bit, by bit drilling soft stratum, single bit footage, use the more time is short, a bit general reusable several Wells;While formation at the bottom of the drill bit smaller in diameter is used, because of the hard strata, single bit less penetration, generally want to use a bit more.Well under a new bit drilling footage of how much depends on the size of the drill bit, type, with the formation of hard and soft and drilling parameters.In general, the smaller bit size, formation harder, the less penetration;The larger the bit size, formation the soft, the more you drilling footage.

Principle

    Rock damage function of diamond bit is developed by the diamond particles.You know the drill bit broken rock, must understand the rock fragmentation by single diamond grain.In hard formation, single grain diamond under the effect of weight on bit rock under high stress condition (about 4200-4200 mpa, some think of up to 6300 mpa), make the rock lithology change, changed from brittle to plastic.Single diamond grain to eat into the formation, the torque under the action of rock cutting, cutting depth basically is equal to the diamond grains to eat into the depth.This process as "plough" so called plough type cutting action of diamond bit.
In some larger brittle rocks such as sandstone, limestone, etc.), the diamond grains on the bit under the effect of wob torque at the same time, the volume of broken rock is greater than the diamond particle rotation and eat into the volume.When the pressure is not big, only along the movement direction of the diamond form small groove, increased pressure will make little rock broken, on either side of the groove depth and the section size of more than diamond grains.
Diamond bit rock fragmentation effect, except with the lithology and the external factors influencing the lithology (such as pressure, temperature, formation fluid properties, etc.) related, the weight on bit size is an important influencing factors.When it's like roller bit, broken rock has the surface layer crushing, crushing, volume crushing fatigue three ways.Only when the diamond particles with enough pressure to eat into the formation rock, rock volumetric fracture occurs, to achieve the ideal effect of rock fragmentation.