Influence of drilling parameters of PDC bit with diamond composite chip o...
Release time:
2022-01-19
Influence of drilling paramThrough the analysis of the influence of drilling parameters of PDC diamond composite bit on rock stress, because the shear stress of rock is smaller than compressive stress and tensile stress, considering that the main failure mode of bottom hole rock is shear failure or tensile stress failure, the maximum principal stress of rock is mainly considered in the analysis. In order to analyze the influence of impact load on rock breaking efficiency, according to the impact frequency analysis results, the influence of different WOB on rock principal stress with or without axial impact is analyzed. During the drilling process of PDC bits with diamond composite chips, large principal stresses appear around the hole and at the bottom of the hole, indicating that the stress of the rock around the hole wall will increase during the drilling process. The greater the WOB, the greater the corresponding rock principal stress. Through comparison, it is found that the principal stress of rock under impact load is significantly greater than that without impact load, and the corresponding principal stress of rock will increase with the increase of WOB. In order to analyze the influence of rotating speed on rock breaking efficiency of PDC bit, under the same WOB condition, applying different rotating speeds to PDC bit can obtain the rock principal stress of PDC bit with or without axial impact. With the increase of rotating speed of PDC bit, the corresponding rock principal stress will also increase, And the impact load condition can increase the principal stress of rock
The above is the analysis of the influence of drilling parameters of PDC bit on rock stress.
eters of PDC bit with diamond composite chip on rock stress
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