钻机快绳通过天车快绳轮极限偏角研究

在深井、超深井钻井作业过程中,由于钢丝绳在滚筒缠绕过程中发生夹绳、乱绳事故,导致施工作业不能继续进行的情况时有发生。现场实践及理论研究表明,快绳进出天车快绳轮偏角过大是造成该现象的主要原因之一。通过研究钢丝绳在天车快绳轮缠绕机理,建立快绳通过天车快绳轮极限偏角模型,并利用Matlab编制计算机程序,针对ZJ70D钻机进行计算求解。结果表明,天车快绳轮直径增加,极限偏角减小;天车轮辐宽度增加,极限偏转角逐渐增加;钢丝绳直径减小,极限偏角增加;天车轮偏转角减小,快绳通过天车轮极限偏角减小。

Study of the maximal declination angle of fast-line rolling around crown block

Fast line goes through the pulley of crown block to get a declination angle.One of the important reasons of steel wire line severe extrusion and wrapping disorder is the big declination angle,which also makes severe abrasion of the wire lines.After studying wrapping mechanism of fast-line in depth,a maximal declination angle model of fast-line rolling around crown block is established.According to the detailed parameters of lifting system of ZJ70D rig,the model is solved to get the affecting factors of maximal declination angle caused by configuration of fast-line and wire line,which is of great help to the design of the lifting system.