Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (3): 825-832.doi: 10.13278/j.cnki.jjuese.20190322

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Development and Application of ZYXC-244 Mechanical Rotary-Percussive Tool Based on Screw Drill

Gan Xin   

  1. Drilling Engineering and Technology Research Institute, Zhongyuan Petroleum Engineering Co. Ltd, SINOPEC, Puyang 457001, Henan, China
  • Received:2019-12-30 Online:2021-05-26 Published:2021-06-07
  • Supported by:
    Supported by the Scientific Research Project of Zhongyuan Petroleum Engineering Co.Ltd,SINOPEC (2017108)

Abstract: Aiming at the problems of insufficient rock-breaking energy, low rate of penetration, and consumption of large number of bits when using a conventional screw drill in difficult-to-drill formations with strong abrasiveness and poor drilling ability, the concept of rotary-percussive drilling and the function of axial mechanical impact were introduced. Based on screw drill integrating bypass valve assembly, power assembly, transmission assembly, and impact assembly, the ZYXC-244 mechanical rotary-percussive tool was developed, and the function of fall prevention was also innovatively designed for the purpose of improving its reliability. Through analyzing the calculation model of the main performance parameters, the characteristic curve of the main performance parameters was obtained. Finally, the ZYXC-244 mechanical rotary-percussive tool based on screw drill was successively applied to Well Z203H1-3 and Well D4011-2 of Xujiahe Formation. When the drilling depth of the new type screw drill was 685.00 m and 72.53 m, the rate of penetration was improved by 38.2% and 31.5%, respectively, and two trips and two bits were saved, compared to those of the conventional screw drill. Through this research, an effective technical tool is provided for difficult-to-drill formations.

Key words: rotary-percussive drilling, screw drill, cam mechanism, fall prevention function, impact energy, impact frequency

CLC Number: 

  • TE921
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