Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (3): 866-874.doi: 10.13229/j.cnki.jdxbgxb20200542

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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. 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

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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

CLC Number: 

  • TE921

Fig.1

Schematic diagram of local stress of rock cutting with single tooth of single and double bit"

Table 1

Basic rock parameters"

参数数值参数数值
岩石的剪切模量G/MPa28 700岩石破碎体积压力Pc/MPa16
岩石的内聚强度A0.79

岩石破碎体积

应变μc

0.001
岩石的压力硬化系数B1.6

压实体积压力

Pl/MPa

800
岩石的应变率系数C0.007压实体积应变μl0.1
压力硬化指数N0.61损伤度D10.04
岩石静态抗压强度fc/MPa102损伤度D21
拉伸应力T/MPa4

材料常数K1/

（104 MPa）

8.5
卸载比例系数Fs0.06

材料常数K2/

（105 MPa）

-1.71
岩石损伤常数Efmin0.01

材料常数K3/

（105 MPa）

2.08
最大无量纲强度Sfmax7岩石初始密度ρ0/(kg·m-3)2700

Table 2

Basic parameters of bit material"

材料弹性模量/MPa泊松比密度/(kg·m-3)
钻头刚体2 0700.37 830
钻头切削齿105 0000.23 520

Fig.2

Model of the bit"

Fig.3

Model of bit mesh"

Fig.4

Single bit stress and failure pattern of rockat the bottom of borehole"

Fig.5

Double bits tress and failure pattern of rockat the bottom of borehole"

Fig.6

Force distribution of bit"

Fig.7

Force distribution of bit"

Table 3

Comparison of maximum Mises stress of single and double bit at different times"

钻头类型时间/s
0.010.030.050.070.09平均
单钻头164.5188.3170.1195.3192.4182.1
双钻头200.3190.4221.7195.1236.8208.9

Fig.8

Time history plot of single bit anddouble bit along Z-axis direction"

Table 4

Materials of heterogeneous rock samples"

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-

Fig.9

Artificial rock sample"

Fig.10

Single bit and double bits"

Fig.11

Wear morphology of single and double bit"

Table 4

Single and double bit drilling test data"

钻头类型进尺/mm纯钻进时间/s钻速/(mm·s-1)
单钻头107621960.49
双钻头103718190.57

Fig.12

Comparison of ROP of single bit and double bit under the same drilling parameters"

Fig.13

Macro morphology of borehole wall ofsingle and double bit drilling"

Fig.14

Micro morphology of borehole wall ofsingle and double bit drilling"

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[1] GAO Ke, SUN You-hong, REN Lu-quan, WANG Wen-long, XIE Xiao-bo, LV Yue-bin . Optimization design and test of nonsmooth ratio of bionics impregnated diamond bit [J]. 吉林大学学报(工学版), 2009, 39(03): 721-0725.
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