砾岩层PDC切削齿优选试验

程书婷; 王红波; 纪慧; 蔡茂盛; 李赛

doi:10.13394/j.cnki.jgszz.2022.0072

砾岩层PDC切削齿优选试验

doi: 10.13394/j.cnki.jgszz.2022.0072

长江大学石油工程学院，武汉 430000

详细信息

通讯作者:
王红波，1978年生，博士后、硕导。主要研究方向：钻井材料与机具、采油设备及破岩机理。E-mail：tmwangbo@163.com

中图分类号: TQ164；TG74
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出版历程
- 收稿日期: 2022-05-12
- 修回日期: 2022-06-22
- 录用日期: 2022-06-24
- 网络出版日期: 2022-07-13
- 刊出日期: 2023-02-20

Experimental study on optimization of PDC cutting teeth for conglomerate layer

School of Petroleum Engineering, Yangtze University, Wuhan 430000, China

摘要

摘要: 为了在砾岩层中获得更好的钻进效果，需要对砾岩层用PDC钻头切削齿的齿形和后倾角进行优选。对普通平面齿、锥形齿和斧形齿在砾岩岩样中进行单齿破岩试验，再对优选出的斧形齿进行仿真分析，优选斧形齿的最佳齿面角度，再与普通平面齿进行切削模拟，验证试验结果。结果表明：斧形齿在砾岩层中切削效率最高，受力最稳定；齿面角度为140°的斧形齿在砾岩中钻进效果更好，当其配合30°后倾角时，切削效率最高。
- 砾岩 /
- PDC切削齿 /
- 齿形优选 /
- 异型齿 /
- ABAQUS
Abstract: In order to obtain better drilling effect in the conglomerate layer, it is necessary to optimize the tooth shape and caster angle of PDC bit for the conglomerate layer. Single tooth rock breaking experiments are conducted on ordinary plane teeth, conical teeth and axe teeth in the conglomerate rock sample. Then the simulation analysis is conducted on the optimized axe teeth to optimize the optimal tooth surface angle of axe teeth. And the cutting simulation is conducted with ordinary plane teeth to verify the experimental results. The results show that the axe tooth has the highest cutting efficiency and the most stable stress in the conglomerate layer; the drilling effect of 140° axe tooth in conglomerate is better; and the cutting efficiency is the highest when 140° axe teeth are matched with 30° caster angle. Therefore, when optimizing the cutting tools for the conglomerate layer, it is necessary to reasonably select the teeth according to the formation characteristics. When applying axe teeth, in order to achieve high cutting efficiency, it is necessary to optimize the combination of tooth surface angle and caster angle.
- conglomerate /
- PDC cutting teeth /
- tooth profile optimization /
- special shaped teeth /
- ABAQUS

HTML全文

图 1 单齿破岩试验装置

Figure 1. Single tooth rock breaking experimental device

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图 2 平面齿、锥形齿、斧形齿物理模型

Figure 2. Physical models of plane tooth, conical tooth and axe tooth

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图 3 不同钻压下不同类型切削齿的钻入深度对比

Figure 3. Comparison of drilling depth of different types of cutting teeth under different weight on bit

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图 4 1 000 N钻压下的3种切削齿切向力对比

Figure 4. Comparison of tangential forces of three cutting teeth under 1 000 N

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图 5 1 500 N钻压下的3种切削齿切向力对比

Figure 5. Comparison of tangential forces of three cutting teeth under 1 500 N

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图 6 2 000 N钻压下的3种切削齿切向力对比

Figure 6. Comparison of tangential forces of three cutting teeth under 2 000 N

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图 7 2 500 N钻压下3种切削齿切向力对比

Figure 7. Comparison of tangential forces of three cutting teeth under 2 500 N

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图 8 不同角度斧形PDC齿钻进砾岩应力场分布

Figure 8. Distribution of stress field in conglomerate drilling with axe shaped PDC teeth at different angles

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图 9 优选后的PDC斧形齿改变后倾角切削砾岩应力场分布

Figure 9. Stress field distribution of cutting conglomerate with optimized axe-shaped PDC teeth after changing the inclination angle

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图 10 PDC齿140°斧形不同后倾角切向力

Figure 10. cutting of 140° axe shaped PDC teeth with different caster angles

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表 1 不同切削齿改变钻压条件下的钻深、切向力

Table 1. Drilling depth and tangential force under different cutting teeth changing weight on bit

钻压 F₁ / N	切削齿类型	钻进深度 h / mm	切向力平均值 F₂ / N	切向力标准差 F₃ / N
1 000	平面齿	0.937	238.746	60.202
	锥形齿	1.648	189.587	51.262
	斧形齿	1.765	173.348	32.076
1 500	平面齿	1.475	406.124	75.32
	锥形齿	2.176	337.641	56.645
	斧形齿	2.497	312.258	32.060
2 000	平面齿	1.873	613.237	110.166
	锥形齿	2.497	497.215	66.182
	斧形齿	2.719	468.768	38.237
2 500	平面齿	2.311	801.129	115.548
	锥形齿	2.893	612.786	75.649
	斧形齿	3.312	594.995	34.839

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表 2 刀具和岩石材料参数

Table 2. Tool and rock material parameters

材料类别	密度 ρ /（g·cm⁻³）	弹性模量 E / GPa	泊松比 μ	热导率 k /（J·m⁻¹·S⁻¹·℃⁻¹）	比热容 J /（kg·℃）	抗拉强度 R_m/ MPa
PDC	3.485	860	0.07	543.0	790
砾岩	2.500	20	0.30	3.5	800	5.3

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