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.

摘要： 为解决定向井、大位移井、水平井和小井眼钻进过程中难以向钻头施加钻压, 以及直井段钻进过程中防 斜打直与机械钻速相互影响的问题, 借助活塞原理及流体柔性加压特性, 成功研制了液力推进器, 可为钻头提供稳定 钻压, 防斜打直, 保护钻头和钻柱。通过液力推进器在TK915-4 井、TK873 井、TH12199 井的使用数据, 以及大量邻 井井斜、钻头状况、机械钻速等对比数据, 分析了YTJ 型液力推进器钻井应用过程中在控制井斜、提高机械钻速、保 护钻头钻具等方面的效果。结果表明, 液力推进器可在防斜的同时, 有效提高机械钻速, 减轻跳钻, 保护钻头钻具, 降低井下事故概率, 减少非生产用时, 提高经济效益。

关键词: 液力推进器, 防斜打直, 减震, 保护钻头, 机械钻速