Directional well-drilling diamond drill bit

Abstract

A directional well-drilling diamond drill bit comprises a drill bit body and further comprises fixed cutter wings, roller cones, a hydraulic structure and the like which are arranged on the drill bitbody. The fixed cutter wings are provided with cutting teeth. The roller cones are provided with teeth. The directional well-drilling diamond drill bit is characterized in that one or more of the fixed cutter wings are provided with one or more grooves, the roller cones are arranged in the grooves, and the roller cones and the fixed cutter wings are in rotating connection. According to the directional well-drilling diamond drill bit, the torque of the drill bit is reduced through the roller cones, the working safety of the drill bit is improved while the stability of the working face of the drill bit is improved, the situation that moving parts fall down at a well bottom is reduced or even avoided, and the available space of a drill bit cutting structure and the hydraulic structure is enlarged.

Description

technical field [0001] The invention belongs to the technical equipment fields of petroleum and natural gas drilling engineering, mining engineering, building foundation engineering construction, geological drilling, tunnel engineering, hydrology and non-excavation, and in particular relates to a directional drilling diamond drill bit. Background technique [0002] In oil and gas drilling engineering, drill bits are usually used to break rocks, which are rock-breaking tools that break rocks to form wellbores. At present, the drill bits used in drilling engineering mainly include three-cone bits and PDC bits. The three-cone bits mainly break rock in the form of impact crushing. The ratio of speed) is greater than 1. When the bit rotates and drills, the speed of the cone is fast, and the teeth on the cone form an impact crushing effect on the rock at the bottom of the well. The energy utilization rate is not high, and the rock-breaking efficiency is relatively low. Mechanical ...

AI Technical Summary

Problems solved by technology

In this way, the weld seam becomes the weak point of the drill bit strength, and it is easy to cause the tooth palm to fall into the well due to the failure of the weld seam during actual drilling. Once the well fall accident occurs, it will have a very adverse impact on the subsequent drilling process and increase the drilling cost.

On the other hand, the existence of the tooth palm will occupy the precious tooth placement space on the drill bit, limiting the tooth placement density of the fixed cutting structure

The existence of the above shortcomings will seriously restrict the use of hybrid drill bits

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