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The movement of roller cone bit manufacturers at the bottom of the well

by:Ronix Tools     2021-06-02
In petroleum drilling, roller cone bits can be adapted to drilling in various formations and are one of the main rock breaking tools. The motion state and force state of the roller cone bit when working at the bottom of the well is quite complicated. A lot of work has been done on the working principle of roller cone bits at home and abroad, both in theoretical research and experimental research, and these research results provide a basis for the design and use of electric drill bits. The movement of the tri-cone bit at the bottom of the well determines the movement of the cones and teeth, which directly determines the breaking effect of the teeth on the formation rock. Therefore, before understanding the working principle of the drill bit breaking rock, one should first understand the movement of the drill bit at the bottom of the well.  1. The revolution of the drill bit. The movement of the bit roller in a clockwise direction around the axis of the electric drill bit is referred to as the revolution of the drill bit. The revolution speed of the drill bit is the rotation speed of the turntable or downhole power drilling tool. When the bit is revolving, the cone rotates around the axis of the bit, and the linear speeds of each row of teeth on the cone rotate around the axis of the bit are different, and the linear speed of the outer row of teeth is the largest.  Second, the rotation of the drill bit When the drill bit rotates, when viewed from the bottom plane of the cone to the cone tip, the cone rotates counterclockwise around its own axis, which is called autorotation. The rotation of the cone is the result of the impact of the rock on the teeth. The influencing factors of the rotation speed of the cone include revolution speed, bit structure, tooth surface structure, drilling parameters and rock properties. In general, the rotation speed of the cone rotation is faster than the rotation speed of the electric drill bit. The ratio of the rotational speed of the cone to the rotational speed of the drill is called the wheel-to-head ratio, and the value of the wheel-to-head ratio is generally between 1 and 1.5.
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