Design and Dynamic Characteristics Analysis of Novel Support Adjustment Mechanism of Wheeled Downhole Tractor

Conventional design method of the downhole tractor is based on cementing casing, which only suitable for smooth wellbore. For open hole well, conventional has poor adaptability and even cannot work normally. In order to improve obstacle surmounting performance wheeled (WDR) expand application range WDR, a double push rod-double spring support adjustment mechanism (DPRDSSAM) proposed in this paper. Meanwhile, DPRDSSAM also needs increase traction force stability WDR well. Kinematic simulation numerical models both are established. The two comprehensively considere influence different forms sizes tractor. single rod (SPRSAM) analyzed. Results show that better than SPRSAM. can effectively promote further research