Study on Rock Breaking Rules of Axe-shaped PDC Cutter with Numerical Simulation

doi:10.3969/j.issn.1006-6535.2021.06.018

Abstract

Abstract: Axe-shaped PDC cutter is of special shape and presents better breaking performance in rock breaking experiment. However, the rock breaking rules of axe-shaped PDC cutter and the optimization method of its working parameters and shape are ambiguous. Therefore, a three-dimensional finite element model of cutting rock with axe-shaped PDC cutter was established with ABAQUS software, and the effects of back dip angle and axe edge angle on the rock breaking effect of axe-shaped PDC cutter were analyzed by finite element numerical simulation method. The results showed that the rock breaking efficiency of the axe-shaped PDC cutter was the highest when the back dip angle was 15 °; with the same back dip angle, the smaller the axe edge angle was, the easier the tangential crack was to propagate inside the rock, and the optimal axe edge angle was 110 °. According to the simulation results, the shape parameters of the bit with axe-shaped PDC cutter were optimized, and good results were obtained in the field test. The results of the study provide an important basis for the optimal design of the bit with axe-shaped PDC cutter.

Key words: axe-shaped cutter of PDC bit, back dip angle, axe edge angle, rock breaking law

CLC Number:

TE921

Zou Deyong, Chen Yahui, Zhao Fangyuan, Cui Yudong. Study on Rock Breaking Rules of Axe-shaped PDC Cutter with Numerical Simulation[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 137-143.

References

[1] 孙明光,张云连,马德坤.适合多夹层地层PDC钻头设计及应用[J].石油学报,2001,22(5):95-99.
SUN Mingguang,ZHANG Yunlian,MA Dekun.Design and application of the PDC bit suited for multi-interbedded formation[J].Acta Petrolei Sinica,2001,22(5):95-99.
[2] 张进双,张增宝,王学才.刀翼式孕镶金刚石钻头设计及在哈山101井的应用[J].石油钻探技术,2019,47(5):57-61.
ZHANG Jinshuang,ZHANG Zengbao,WANG Xuecai.The design of blade type diamond-impregnated bit and it′s application in Well Hashan 101[J].Petroleum Drilling Techniques,2019,47(5):57-61.
[3] 王滨,李军,邹德永,等.适合强研磨性硬地层PDC-金刚石孕镶块混合钻头设计与应用[J].特种油气藏,2018,25(1):169-176.
WANG Bin,LI Jun,ZOU Deyong,et al.Design and application of a PDC hybrid drill bit with impregnated diamond insert for the hard formation with strong abrasivity[J].Special Oil & Gas Reservoirs,2018,25(1):169-176.
[4] 左汝强.国际油气井钻头进展概述(四)——PDC钻头发展进程及当今态势(下)[J].探矿工程(岩土钻掘工程),2016,43(4):40-48.
ZUO Ruqiang.International advancement of drilling bits for oil and gas well(4):PDC bits progress and present trend(Ⅱ)[J].Exploration Engineering(Rock & Soil Drilling and Tunneling),2016,43(4):40-48.
[5] 许利辉,毕泗义.国外PDC切削齿研究进展[J].石油机械,2017,45(2):35-40.
XU Lihui,BI Siyi.Overseas researches on PDC cutters[J].China Petroleum Machinery,2017,45(2):35-40.
[6] GUMICH D,PAK M,LOMOV A,et al.New ridge diamond elements improve PDC bit efficiency[C].SPE187717,2017:1-9.
[7] 冯松林,樊松,包立军,等.脊形金刚石元件钻头技术研究与应用[J].石油机械,2018,46(4):17-23.
FENG Songlin,FAN Song,BAO Lijun,et al.Research and application of ridged diamond element bit[J].China Petroleum Machinery,2018,46(4):17-23.
[8] 严成森.屋脊齿PDC钻头破岩机理与设计研究[D].成都:西南石油大学,2018.
YAN Chengsen.Research on rock breaking mechanism and design of PDC bit with ridge cutter[D].Chengdu:Southwest Petroleum University,2018.
[9] 林兆虎.新型非平面PDC切削齿的研究与设计[D].成都:西南石油大学,2019.
LIN Zhaohu.Research and design of new non-planar PDC cutter[D].Chengdu:Southwest Petroleum University,2019.
[10] CRANE D,ZHANG Y H,DOUGLAS C,et al.Innovative PDC cutter with elongated ridge combines shear and crush action to improve PDC bit performance[C].SPE183984,2017: 1-10.
[11] SARA N,KARIM A,VENKI K.The disruptive concept of 3D cutters and hybrid bits in polycrystalline diamond compact drill-bit design[C].SPE183335,2016:1-12.
[12] 谢晗,况雨春,秦超.非平面PDC切削齿破岩有限元仿真及试验[J].石油钻探技术,2019,47(5):69-73.
XIE Han,KUANG Yuchun,QIN Chao.The Finite element simulation and test of rock breaking by non-planar PDC cutting cutter[J].Petroleum Drilling Techniques,2019,47(5):69-73.
[13] 谢豆.深部硬地层PDC-牙轮复合钻头破岩机理研究[D].成都:西南石油大学,2016.
XIE Dou.Research on rock breaking mechanism of PDC-cone composite bit in deep hard formations [D].Chengdu:Southwest Petroleum University,2016.
[14] 彪仿俊.水力压裂水平裂缝扩展的数值模拟研究[D].合肥:中国科学技术大学,2011.
BIAO Fangjun.On numerical simulation study of horizontal fracture propagation in hydraulic fracturing[D].Hefei:University of Science and Technology of China,2011.
[15] JAIME M C,ZHOU Y,LIN J S,et al.Finite element modeling of rock cutting and its fragmentation process[J].International journal of rock mechanics and mining sciences,2015,80(3):137-146.