讨论了钻进过程中井径扩大和缩小 1mm的情况下 ,可控偏心器液压系统蓄能器回路的动静态特性。通过受力分析和液压传动计算 ,得出系统的静态参数。建立了动态方程组 ,并对液压系统自适应井径变化的能力进行了软件仿真。结果表明 ,在一定的条件下 ,可控偏心器的液压系统具有对井径± 1mm变化的自适应能力 The dynamic and static characteristics of the accumulator circuit of the controllable eccentric hydraulic system are discussed under the circumstance that the borehole diameter is enlarged and reduced by 1mm during the drilling process. Through the force analysis and hydraulic transmission calculation, the static parameters of the system are obtained. The dynamic equation set is established and the software simulation of hydraulic system adaptability to the change of the caliper is carried out. The results show that under certain conditions, the hydraulic system of the controllable eccentric has the adaptability to the variation of the borehole diameter ± 1mm