PDC钻头切削破岩机理及数值模拟研究

李琴; 刘永升; 黄志强; 蔡春雷

doi:10.13433/j.cnki.1003-8728.2016.0208

PDC钻头切削破岩机理及数值模拟研究

doi: 10.13433/j.cnki.1003-8728.2016.0208

1.
西南石油大学机电工程学院, 成都 610500;
2.
中国石油大学石油工程学院, 山东青岛 266555

基金项目:

国家863项目子课题项目(2012AA061201)资助

详细信息

作者简介:
李琴(1970-),副教授,硕士生导师,研究方向为井下工具及岩石破碎,ssllys@163.com

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- 文章访问数: 126
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- 被引次数: 0
出版历程
- 收稿日期: 2014-04-26
- 刊出日期: 2016-02-05

Exploring Mechanism and Numerical Simulation of Rock Breaking Process Using PDC Bit

1.
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;
2.
College of Petroleum Engineering, China Petroleum University, Shandong Qingdao 266555, China

摘要

摘要: 由于PDC钻头几何外形、岩石材料以及井底钻井工况的复杂性,PDC钻头切削破岩机理的研究一直都是难点问题。基于单齿切削机理,引入岩石比功ε,推导出钻井钻压W、扭矩t和切削厚度d之间的关系,建立切削比功E与钻井强度S的二维图;同时结合接触摩擦分量,分析并阐述了破岩过程的概念模型;通过有限元方法建立全尺寸PDC钻头动态破岩的非线性动力学三维仿真模型,开展PDC钻头切削破岩机理的研究,进一步分析PDC钻头破岩过程的响应规律。结果表明:岩石损伤与应力云图可直观反映钻井过程岩石损伤剥落形成井眼及井底应力分布状况;PDC钻头钻进方向的位移、加速度和扭矩响应规律与理论分析相一致,并揭示了PDC钻头钻进过程中的"进尺台阶"现象,亦佐证了破岩过程的概念模型。
- PDC钻头 /
- 破岩机理 /
- 有限元 /
- 岩石损伤
Abstract: Due to the complexity of PDC (polycrystalline diamond compact) bits' geometry, rock materials and a downhole's working conditions, its cutting rock breaking mechanism has always been a puzzle. Using the single tooth cutting mechanism and introducing the specific energy ε of rock, we find the relationship among Weight On Bit (WOB) w, torque t and cutting depth d and establish the two-dimensional diagram (E-S) between cutting specific energy (E) and drilling strength (S). The concept model of rock fragmentation is elaborated by using the frictional component. The 3D non-linear dynamic model of dynamic rock breaking with a full-gauge PDC bit is established with the finite element method, which can be used to further analyze the response of rock-breaking processes of the PDC drill bit. The analysis results show that the rock damage and the stress cloud can directly reflect the wellbore formation following the peeling of the damaged rock and the stress distribution of the downhole during the drilling process. The displacement, acceleration and torque responses of the PDC drill bit in its drilling direction well coincide with the theoretical analysis and not only interpret the "footage step" in the drilling process but also evidence the conceptual model of the rock breaking process.
- drilling /
- finite element method /
- PDC bit /
- rock breaking mechanism

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参考文献(18)

[1]	杨丽,陈康民.PDC钻头的应用现状与发展前景[J].石油机械,2007,35(12):70-72 Yang L, Chen K M. Application status and developing prospects of PDC bits[J]. China Petroleum Machinery, 2007,35(12):70-72(in Chinese)
[2]	江晓乐.石油天然气钻采用PDC切削齿的最新发展[J].金刚石与磨料磨具工程,2010,30(2):1-7 Jiang X L. Progress of polycrystalline diamond compact cutters for oil and gas drilling[J]. Diamond & Abrasives Engineering, 2010,30(2):1-7(in Chinese)
[3]	Zijsling D H. Single cutter testing-a key for PDC bit development[C]//Proceedings of Offshore Europe, Aberdeen:Society of Petroleum Engineers, 1987
[4]	Almenara J R, Detournay E. Cutting experiments in sandstones with blunt PDC cutters[C]//Proceedings of Eurock'92, London:Thomas Telford,1992:215-220
[5]	Detournay E, Defourny P. A phenomenological model for the drilling action of drag bits[J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1992,29(1):13-23
[6]	Kuru E, Wojtanowicz A K. An experimental study of sliding friction between PDC drill cutters and rocks[J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1995,32(3):277-283
[7]	Chen Y H. Experimental study of rock-breaking with an offset single cone bit[J]. Petroleum Science, 2008, 5(2):179-182
[8]	汪冰峰,杨扬,王绍斌,等.聚晶金刚石复合片车削花岗岩的磨损规律[J].中南大学学报(自然科学版),2009,40(6):1557-1562 Wang B F, Yang Y, Wang S B, et al. Abrasion mechanism of polycrystalline diamond compact cutter turning granite[J]. Journal of Central South University (Science and Technology), 2009,40(6):1557-1562; (in Chinese)
[9]	闫铁,李玮,毕雪亮,等.旋转钻井中岩石破碎能耗的分形分析[J].岩石力学与工程学报,2008,27(S2):3649-3654 Yan T, Li W, Bi X L, et al. Fractal analysis of energy consumption of rock fragmentation in rotary drilling[J]. Chinese Journal of Rock Mechanics and Engineering, 2008,27(S2):3649-3654(in Chinese)
[10]	Geoffroy H, Minh N D. Study on interaction between rocks and worn PDC's cutter[J]. International Journal of Rock Mechanics and Mining Sciences, 1997,34(3-4):95.e1-95.e15
[11]	Huang H L, Detournay E L, Bellier B L. Discrete element modelling of rock cutting[C]//The 37th U.S. Symposium on Rock Mechanics, Vail, Colorado:American Rock Mechanics Association,1999:123-130
[12]	Richard T, Dagrain F, Detournay E. Determination of rock strength properties from scratching tests[J]. International Journal of Rock Mechanics & Mining Sciences, 2008, in preparation
[13]	Richard T. Determination of rock strength from cutting tests[D]. Minnesota:University of Minnesota,1999
[14]	Richard T, Germay C, Detournay E. Self-excited stick-slip oscillations of drill bits[J]. Comptes Rendus Mécanique, 2004,332(8):619-626
[15]	Johanson M. Structural behavior in concrete frame corners of civil defence shelter. non-liner finite element analyses and experiments[D]. Golehora, Sweden:Department of Structural Engineering, Chalmers University of Technology, 2000
[16]	王清峰,朱才朝,宋朝省,等.牙轮钻头单牙轮的破岩仿真研究[J].振动与冲击,2010,29(10):108-112 Wang Q F, Zhu C C, Song C S, et al. Non-limear dynamic analysis of a roller cone bit-well rock system with rock-cone bit interaction[J]. Journal of Vibration and Shock, 2010,29(10):108-112(in Chinese)
[17]	林铁军,练章华,孟英峰,等.空气钻井中动态破岩有限元仿真研究[J].岩石力学与工程学报,2008,27(增2):3592-3597 Lin T J, Lian Z H, Meng Y F, et al. Finite elements method study on dynamic rock breaking in air drilling[J]. Chinese Journal of Rock Mechanics and Engineering, 2008,27(S):3592-3597(in Chinese)
[18]	Yigit A S, Christoforou A P. Stick-slip and bit-bounce interaction in oil-well drillstrings[J]. Journal of Energy Resources Technology, 2006,128(4):268-274