Drill string stick-slip vibration suppression method considering torsion impactor

Abstract

The invention discloses a drill string stick-slip vibration suppression method considering a torsion impactor. The method comprises the steps that a drill string is equivalent to a four-degree-of-freedom stick-slip vibration model composed of a rotary disc, a drill rod, a drill collar and a drill bit; the torsion impactor is arranged on the drill bit, torque provided by the torsion impactor is introduced into the four-degree-of-freedom stick-slip vibration model, and a drill string stick-slip vibration model considering the torsion impact effect is established; the drill string stick-slip vibration model considering the torsion impact effect is solved, and drill string stick-slip vibration characteristics are obtained; and according to the drill string stick-slip vibration characteristics, working parameters of the torsion impactor are adjusted to suppress drill string stick-slip vibration. According to the method, the drill string stick-slip vibration model considering the torsion impact effect is established, the drill string stick-slip vibration model is solved to obtain the accurate drill string stick-slip vibration characteristics, the working parameters of the torsion impactor are adjusted according to the drill string stick-slip vibration characteristics to suppress drill string stick-slip vibration, and the safety and high efficiency of drilling operation are guaranteed.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a method for suppressing stick-slip vibration of a drill string considering a torsion impactor. Background technique [0002] With the deepening of exploration and development of oil and gas resources, drilling is becoming more and more difficult. When drilling hard formations, due to the high plasticity and hardness of the rock, the PDC (Polycrystalline Diamond Compact, polycrystalline diamond compact) bit has poor rock-breaking effect, and it is easy to generate stick-slip vibration so that it fails prematurely, and ultimately greatly reduces the mechanical capacity. Drilling speed. The torsion impactor can convert the fluid energy of the drilling fluid into high-frequency, torsional, uniform and stable mechanical impact energy and transmit it directly to the PDC bit, thereby assisting the PDC bit to overcome frictional torque and suppress stick-slip vibration of th...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the stick-slip vibration characteristics of the drill string cannot be accurately obtained, and to provide a drill string stick-slip vibration suppression method considering the torsional impactor, so as to establish a four-degree-of-freedom drill string stick-slip vibration considering torsional impact Model, solve the model to obtain accurate stick-slip vibration characteristics of the drill string, select the working parameters of the torsion impactor according to the stick-slip vibration characteristics of the drill string, and suppress the stick-slip vibration of the drill string

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