双孕镶金刚石钻头的自平衡逆向回转破岩性能

doi:10.13229/j.cnki.jdxbgxb20200542

吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (3): 866-874.doi: 10.13229/j.cnki.jdxbgxb20200542

双孕镶金刚石钻头的自平衡逆向回转破岩性能

高科¹(),陈杭凯¹,许晓慧¹,高红通²,谢晓波¹(),闫立鹏³

^1.吉林大学建设工程学院，长春 130021
^2.中煤科工集团西安研究院有限公司，西安 710077
^3.核工业二〇八大队，内蒙古包头 014010

收稿日期:2020-07-17 出版日期:2021-05-01 发布日期:2021-05-07
通讯作者: 谢晓波 E-mail:gaokenm@jlu.edu.cn;xiexiaobo@jlu.edu.cn
作者简介:高科（1977-），男，教授，博士生导师.研究方向:仿生钻探机具,科学钻探,地外星体钻探.E-mail:gaokenm@jlu.edu.cn
基金资助:
国家重点研发计划项目(2018YFC0808201-4);广州海洋地质调查局项目(DD20190584)

Rock fragmentation characteristics of double impregnated diamond bits with self⁃balancing reverse rotation

Ke GAO¹(),Hang-kai CHEN¹,Xiao-hui XU¹,Hong-tong GAO²,Xiao-bo XIE¹(),Li-peng YAN³

^1.College of Construction Engineering，Jilin University，Changchun 130021，China
^2.Xi'an Research Institute Co. , Ltd. , China Coal Technology and Engineering Group Corp，Xi'an 710077，China
^3.Nuclear Industry Brigade 208，Baotou 014010，China

Received:2020-07-17 Online:2021-05-01 Published:2021-05-07
Contact: Xiao-bo XIE E-mail:gaokenm@jlu.edu.cn;xiexiaobo@jlu.edu.cn

摘要/Abstract

摘要：

为了揭示双钻头自平衡同步逆向回转的破岩特性，采用理论计算和数值模拟等方法，对比研究了双孕镶金刚石钻头同步逆向回转和单孕镶金刚石钻头单向回转的破岩特征，得出如下结论：双钻头在孔底呈现双向小台阶双螺旋钻进，而单钻头则呈现单向小台阶螺旋钻进；由于双钻头的内、外钻头逆向回转产生了扭矩平衡作用，对孔底岩石的作用合力更小，对地层的扰动更弱。通过室内试验对比研究得出：双钻头逆向回转情况下，孔壁更光滑、稳定；双钻头对孔底岩石能产生更多的应力集中点，且磨损较单钻头更为均匀，具有更长的使用寿命；双钻头在同等钻进参数下，钻速更快，说明双钻头更容易破岩。本文研究成果可为双钻头自平衡钻进技术的研究提供理论支撑。

关键词: 孕镶金刚石钻头, 自平衡, 双钻头, 破岩性能, 逆向回转

Abstract:

In order to reveal the characteristics of rock breaking process with double bits' self-balancing and synchronous reverse rotation. In this paper， through theoretical calculation， numerical simulation and hole wall morphology analysis， the rock fragmentation characteristics of dual impregnated diamond bit and single impregnated diamond bit are compared and studied. The simulation data show that show that that the double bits present bidirectional small step double screw drilling at the bottom of the hole， while the single bit presents unidirectional small step spiral drilling； due to the reverse rotation of the inner and outer bits of the double impregnated diamond bit， the rock fragmentation characteristics of the single impregnated diamond bit are compared The experiment data show that the torque balance effect on the bottom rock is smaller， the disturbance to the formation is weaker， and the hole wall is more smooth and stable； the double bit produces more stress concentration points for the rock at the bottom of the hole， the maximum stress value is 114.7% of the single bit， and the axial displacement is 121.7% of the single bit， which indicates that the double bit is more likely to break the rock. The research results provide theoretical support for the research of double bit self balanced drilling.

Key words: impregnated diamond bit, self-balancing, double bits, rock fragmentation characteristics, reverse rotation

中图分类号:

TE921

高科,陈杭凯,许晓慧,高红通,谢晓波,闫立鹏. 双孕镶金刚石钻头的自平衡逆向回转破岩性能[J]. 吉林大学学报(工学版), 2021, 51(3): 866-874.

Ke GAO,Hang-kai CHEN,Xiao-hui XU,Hong-tong GAO,Xiao-bo XIE,Li-peng YAN. Rock fragmentation characteristics of double impregnated diamond bits with self⁃balancing reverse rotation[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 866-874.

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参数	数值	参数	数值
岩石的剪切模量G/MPa	28 700	岩石破碎体积压力P_c/MPa	16
岩石的内聚强度A	0.79	岩石破碎体积应变μ_c	0.001
岩石的压力硬化系数B	1.6	压实体积压力 P_l/MPa	800
岩石的应变率系数C	0.007	压实体积应变μ_l	0.1
压力硬化指数N	0.61	损伤度D₁	0.04
岩石静态抗压强度f_c/MPa	102	损伤度D₂	1
拉伸应力T/MPa	4	材料常数K₁/ （10⁴ MPa）	8.5
卸载比例系数Fs	0.06	材料常数K₂/ （10⁵ MPa）	-1.71
岩石损伤常数E_fmin	0.01	材料常数K₃/ （10⁵ MPa）	2.08
最大无量纲强度S_fmax	7	岩石初始密度ρ₀/(kg·m^-3)	2700

材料	弹性模量/MPa	泊松比	密度/(kg·m^-3)
钻头刚体	2 070	0.3	7 830
钻头切削齿	105 000	0.2	3 520

钻头类型	时间/s
钻头类型	0.01	0.03	0.05	0.07	0.09	平均
单钻头	164.5	188.3	170.1	195.3	192.4	182.1
双钻头	200.3	190.4	221.7	195.1	236.8	208.9

名称	作用	成分
水泥	粘结剂	复合硅酸盐水泥
石块	骨架材料	河卵石、砾石、花岗岩石块等
沙子	骨架材料	普通沙子
建筑速溶胶	辅助剂	-

钻头类型	进尺/mm	纯钻进时间/s	钻速/(mm·s^-1)
单钻头	1076	2196	0.49
双钻头	1037	1819	0.57

双孕镶金刚石钻头的自平衡逆向回转破岩性能

Rock fragmentation characteristics of double impregnated diamond bits with self⁃balancing reverse rotation

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