J4 ›› 2012, Vol. 42 ›› Issue (4): 1119-1124.

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Grain Size Distribution Law of Cuttings in DTH Hammer Reverse Circulation Drilling

Huang Yong1|Zhu Li-hong2|Yin Kun1|Ren Hong3   

  1. 1.College of Construction Engineering, Jilin University, Changchun130026, China;
    2.School of Petroleum Engineering, China University of Petroleum, Qingdao266580, Shandong, China;
    3.Drilling Technology Research Institute, Shengli Oilfield, Dongying267021, Shandong, China
  • Received:2011-10-20 Online:2012-07-26 Published:2012-07-26

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Abstract:

Research on grain size distribution law would be helpful to further analysis on rock broken mechanism of DTH hammer reverse circulation drilling. The grain size distribution of cuttings in DTH hammer reverse circulation drilling was described by distribution and fractal function, and its distribution law was obtained. Results showed that the grain size distribution of cuttings conform to Gandin-Schuhmann distribution and Rosin-Rammler distribution, and much closer to G-S distribution. The cutting grain size distribution characteristics of reverse circulation drilling follow the fractal rule and can be described by fractal method. The grain size distribution indicates that the total mass of cuttings greater than 5 mm is 74.8%, which shows a predominant volume broken of rock by DTH hammer. The size of massive particle is between 5 mm to 12 mm, indicating the size difference in volume broken accompanied by repeated crushing.

Key words: DTH hammer, reverse circulation, cutting, grain size distribution, fractal

CLC Number: 

  • P634.1
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