Theoretical research on the ploughing rock breaking properties of new conical PDC cutter

Authors

JU Pei, Xi'an Research Institute Co. Ltd., China Technology and Engineering Group Corp., Xi'an 710077, China
WANG Chuanliu

Abstract

The researches on the conical PDC cutter are now focused on numerical simulation, field and laboratory tests, the theoretical analysis on its mechanical properties has not been reported. Therefore, the tensile shear rock breaking mechanism and cutting load distribution characteristics of the conical PDC cutter are described by numerical simulation, the theoretical formula of the cutting load is derived according to the energy balance principle. Results show that comparing with the conventional cylindrical PDC cutter, the rock breaking process of conical PDC cutter is more stable, the cutting load is influenced by the rock properties, the parameters of cutter structure, the cutting depth, and the cutting angle; the cutting load of conical PDC cutter increases with the increase of cone top radius, cutting angle and cutting depth. The research results can provide theoretical support for the design of conical PDC cutter and the PDC bit.

Keywords

conical PDC cutter, rock breaking property, cutting load, theoretical analysis

DOI

10.3969/j.issn.1001-1986.2019.02.033

Recommended Citation

J W. (2019) "Theoretical research on the ploughing rock breaking properties of new conical PDC cutter," Coal Geology & Exploration: Vol. 47: Iss. 2, Article 34.
DOI: 10.3969/j.issn.1001-1986.2019.02.033
Available at: https://cge.researchcommons.org/journal/vol47/iss2/34

Reference

[1] 张朋,高晓亮,李波. 2种PDC钻头在淮南某煤矿硬岩穿层钻孔施工中的对比与分析[J]. 煤矿机械,2017,38(11):64-66. ZHANG Peng,GAO Xiaoliang,LI Bo. Comparison and analysis of two kinds of PDC bit of hard rock layer-through borehole drilling in some coal mine of Huainan[J]. Coal Mine Machinery,2017,38(11):64-66.

[2] 谭松成,段隆臣,叶雪峰,等. 硬岩钻进用石油钻头研究现状及发展趋势[J]. 地质与勘探,2013,49(2):373-378. TAN Songcheng,DUAN Longchen,YE Xuefeng,et al. Current status and tendency of research on oil bits for hard rock drilling[J]. Geology and Exploration,2013,49(2):373-378.

[3] 孙荣军,石智军,李锁智. 煤矿井下定向钻进配套钻头的选型与使用[J]. 煤田地质与勘探,2014,42(1):83-86. SUN Rongjun,SHI Zhijun,LI Suozhi. Selection and ap-plication of drill bit for directional drilling in underground coal mine[J]. Coal Geology & Exploration,2014,42(1):83-86.

[4] LUNA O, SALLNAS G,LOZANO C,et al. Conical diamond element bit on high-torque RSS mitigates vibration maximizing ROP in hard carbonates saving 90 hours of rig time, offshore Mexico[C]//At the SPE Latin American and Caribbean Petroleum Engineering Conference. Quito,Ecuador,18-20 November,2015.

[5] HEEKEREN H V,STORM R,KRAAN A V,et al. Conical diamond element bit sets new performance benchmarks drilling hard and abrasive formations, offshore Netherlands[C]//At the SPE North Africa Technical Conference and Exhibition. Cairo,Egypt,14-16 September,2015.

[6] HEMPTON R,COPELAND C,COX G,et al. Innovative conical diamond element bits drill back-to-back tight curves in one run,improving economics while reducing risk in Avalon shale play, New Mexico[C]//At the SPE Liquids-Rich Basins Conference-North America. Midland,Texas,USA,2-3 September,2015.

[7] RADHAKRISHNAN V,CHUTTANI A,ANGGRANI F,et al. Conical diamond element technology delivers step change in directional drilling performance[C]//At the IADC/SPE Asia Pacific Drilling Technology Conference. Singapore,22-24 August,2016.

[8] 孙源秀,邹德永,侯绪田,等. 锥形PDC齿犁切破岩受力试验研究[J]. 石油机械,2014,42(9):23-26. SUN Yuanxiu,ZOU Deyong,HOU Xutian,et al. Test of force of conical PDC cutter during rock plow-breaking[J]. China Petroleum Machinery,2014,42(9):23-26.

[9] 邹德永,孙源秀,于鹏,等. 锥形齿PDC钻头台架试验研究[J]. 中国石油大学学报(自然科学版),2015,39(2):48-52. ZOU Deyong,SUN Yuanxiu,YU Peng,et al. Experiment study on bench test of stinger PDC bit[J]. Journal of China University of Petroleum,2015,39(2):48-52.

[10] 杨顺辉. 锥形PDC齿钻头的研制及室内试验评价[J]. 石油机械,2015,43(2):14-17. YANG Shunhui. Development and laboratory tests evaluation of PDC bit with conical cutter[J]. China Petroleum Machinery,2015,43(2):14-17.

[11] GOKTAN R M,GUNES N. A semi-empirical approach to cutting force prediction for point-attack picks[J]. Journal-South African Institute of Mining and Metallurgy,2005,105(4):257-263.

[12] LIU Songyong,LIU Zenghui,CUI Xinxia,et al. Rock breaking of conical cutter with assistance of front and rear water jet[J]. Tunnelling & Underground Space Technology Incorporating Trenchless Technology Research,2014,42(5):78-86.

[13] 徐小荷,余静. 岩石破碎学[M]. 北京:煤炭工业出版社,1984.

[14] ATKINS A G. Modelling metal cutting using modern ductile fracture mechanics:Quantitative explanations for some longstanding problems[J]. International Journal of Mechanical Sciences,2003,45(2):373-396.

[15] RAHMANIJ R,SMITH J R,DAHI T A. Analytical modeling of PDC single cutter-rock interaction under confining pres-sure[C]//At the 46th US Rock Mechanics/Geomechanics Symposium. Chicago,IL,USA,24-27 June,2012.