Composite rotary pdc drill bit

Abstract

The invention relates to a composite rotary cutting type PDC drill bit. The composite rotary cutting type PDC drill bit comprises a body upper shell. A drilling tool joint is rotatably connected intothe body upper shell from top to bottom in a penetrating mode. A body lower shell capable of rotating synchronously with the drilling tool joint is rotatably arranged on the lower portion of the bodyupper shell in a sleeving mode. At least two drill bit blades are radially and symmetrically arranged at the bottom end of the body lower shell. At least two rotary cutting wheels are further radiallyand symmetrically arranged at the bottom end of the body lower shell, and the rotary cutting wheels and the drill bit blades are uniformly arranged in a staggered mode in the circumferential direction. The drill bit blades can rotate in the same direction with the drilling tool joint, and the rotary cutting wheels can rotate in the same direction with the drilling tool joint and rotate in the reverse direction. According to the composite rotary cutting type PDC drill bit, the drill bit blades can break rocks while the rotary cutting wheels can reversely break the rocks in a rotary cutting mode, the mechanical staggered type rock breaking under the hard plastic formation is achieved, the drilling efficiency and adaptability to the hard plastic formation are effectively improved, the drilling period is shortened, and the exploration and development benefits are improved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a composite rotary-cutting PDC drill bit capable of mechanically intersecting rock breaking under hard-plastic formations. Background technique [0002] With the intensification of oil exploration and development, the drilling workload in various complex geological formations shows an increasing trend year by year. However, many problems have been encountered in the process of drilling hard plastic rock formations. Due to the plasticity of hard plastic rock formations, the drilling pressure applied during the drilling process causes plastic deformation of the rocks, resulting in the cutting teeth of ordinary PDC bits. Eating into the formation not only increases the drilling cycle, but also accelerates the wear of the drill bit. As a result, the construction period has been delayed, and the drilling cost has also been increased. New drilling technologies are urgently ...

AI Technical Summary

Problems solved by technology

However, many problems have been encountered in the process of drilling hard plastic rock formations. Due to the plasticity of hard plastic rock formations, the drilling pressure applied during the drilling process causes plastic deformation of the rocks, resulting in the cutting teeth of ordinary PDC bits. Eating into the formation not only increases the drilling cycle, but also accelerates the wear of the drill bit

As a result, the construction period has been delayed, and the cost of drilling has also been increased. New drilling technologies are urgently needed to increase the drilling speed, shorten the drilling cycle, and improve the efficiency of exploration and development.

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