Conduct drilling operations, under which a casing diameter will be smaller

In some fields deep within the block are still a lot of oil and gas reserves. For the development of this part of the energy, and therefore the original on the basis of the borehole drilling  cubic boron nitride  oil wells with 5 1/2 bushing diameter is ф123.7mm, if carried out on the basis of  Diamond blade , under which a casing diameter will be smaller, it is bound to the later development of oilfields with to a lot of abrasive wheels  . Therefore, the development of a demand to meet the Daqing oil field drilling, reaming or drilling reaming drill after a slimhole conditions PDC adjustable drill, the development of oil production has a very important value.