In directional well drilling process,Hydraulic variable gauge stabilizer uses the extended hardfacing block to reach full hole size,so as to ensure that the hydraulic variable gauge stabilizer can achieve the purpose of increasing  slope and  stabilizing  slope when work with different drilling tool combinations in the directional well.At the same time,due to the pump is stopped,the hardfacing block will retract,and the outer diameter of hydraulic variable gauge stabilizer will become small,which is beneficial to the smooth progress of drilling and tripping,andeffectively prevents the occurrence of resistance and stuck