关键词: 液力推进器, 防斜打直, 减震, 保护钻头, 机械钻速

Abstract: In drilling process of directional wells, displacement wells, horizontal wells and small holes, it is difficult to apply weight on bit. And in the drilling process of vertical holes, anti-deviation or straightening hole have interaction effect on ROP. To solve the abovementioned problems, hydraulic thrusters are successfully developed by means of piston principle and flexible pressure of fluid. Hydraulic thrusters can be used to apply stable WOB, prevent wells from deviating and protect drill strings and drill bits. On the basis of the application data of hydraulic thrusters for Well TK915-4, Well TK873 and Well TH12199 and the data of well deviation, bit conditions and ROP compared with adjacent wells, the paper analyzes the application effects of hydraulic thruster YTJ in controlling deviation, improving rate of penetration, protecting drill bit sand drilling tools, etc. The results show that hydraulic thrusters can not only prevent borehole inclination but also effectively improve ROP, reduce bit bouncing, protect bits and drill strings, reduce downhole accident probability, reduce non-productive time, and thus increase economic benefit.