基于离散元法的砾岩地层三棱齿切削破岩数值模拟

doi:10.3969/j.issn.1006-6535.2022.04.021

特种油气藏 ›› 2022, Vol. 29 ›› Issue (4): 149-155.DOI: 10.3969/j.issn.1006-6535.2022.04.021

基于离散元法的砾岩地层三棱齿切削破岩数值模拟

刘笑傲¹, 邹德永¹, 王庆², 刘洪山³, 黄勇¹, 陈雅辉⁴

1.中国石油大学(华东),山东青岛 266580;
2.中国石油工程技术研究院有限公司,北京 102206;
3.中国石油青海油田分公司,青海海西 816499;
4.中国石化重庆页岩气有限公司,重庆 408400

收稿日期:2021-10-21 修回日期:2022-06-30 出版日期:2022-08-25 发布日期:2023-01-09
通讯作者: 邹德永(1962—),男,教授,博士生导师,1984年毕业于华东石油学院钻井工程专业,2004年毕业于石油大学(华东)油气井工程专业,获博士学位,现主要从事油气井工程方面的教学和研究工作。
作者简介:刘笑傲(1992—),男,2015年毕业于中国石油大学胜利学院机械设计制造及自动化专业,现为中国石油大学(华东)油气井工程专业在读博士研究生,现主要从事油气井岩石力学与工程方面的研究工作。
基金资助:
中国博士后科学基金“钻柱中应力分布差异对声传播特性的影响规律研究”(2021M693508);中央高校基本科研业务专项基金“基于循环温度激变的致密砂岩可钻性弱化机制研究”(18CX02102A);中国石油重大科技项目“深层复杂条件钻井提速方法与关键技术研究”(ZD2019-183-005)

Numerical Simulation of Rock Breaking by Triangular Prismatic Cutter in Conglomerate Formation Based on Discrete Element Method

Liu Xiaoao¹, Zou Deyong¹, Wang Qing², Liu Hongshan³, Huang Yong¹, Chen Yahui⁴

1. China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. CNPC Engineering Technology R&D Company Limited, Beijing 102206, China;
3. PetroChina Qinghai Oilfield Company, Haixi, Qinghai 816499, China;
4. Sinopec Chongqing Shale Gas Co., Ltd., Chongqing 408400, China

Received:2021-10-21 Revised:2022-06-30 Online:2022-08-25 Published:2023-01-09

摘要/Abstract

摘要： 三棱齿因具有强抗冲击性与高耐磨性,可提高PDC钻头在砾岩地层中破岩效率及寿命,但在砾岩地层中的破岩机理及破岩效果不明确,导致砾岩地层中三棱齿PDC钻头设计缺乏理论依据。针对上述问题,基于离散元法建立了三棱齿切削破碎砾岩的数值仿真模型,研究不同砾石与胶结物基质黏结强度差情况下砾岩破岩形式与过程,并分析了三棱齿直径及后倾角对三棱齿切削力及砾岩破碎过程中岩石裂纹拓展的影响。结果表明:在黏结强度差大于70 MPa时,砾石会直接被剥离,而强度差小于40 MPa时,砾石直接被破碎;2种黏结强度差情况下,三棱齿直径为16 mm,后倾角为15 °时,切削破碎砾岩效率均能达到最高。该研究对三棱齿PDC钻头设计具有理论意义。

关键词: 三棱齿, PDC钻头, 砾岩地层, 破岩机理, 切削齿直径, 后倾角, 离散元法

Abstract: Due to its strong resistance to impact and wear, triangular prismatic cutter grants PDC bit with better rock-breaking efficiency and longer service life when it is used in conglomerate formation, but the rock-breaking mechanism and rock-breaking effect in conglomerate formation are not clear, resulting in a lack of theoretical support for the design of the PDC bit with triangular prismatic cutter which is used in the conglomerate formation. A numerical simulation model of conglomerate breaking by triangular prismatic cutter was established based on the discrete element method to study the conglomerate breaking mode and process under the condition of different bonding strength between conglomerate and cement matrix, and to analyze the effect of diameter and back rake angle of triangular prismatic cutter on the cutting force of triangular prismatic cutter and the propagation of rock cracks during conglomerate breaking. The results showed that the conglomerate was directly stripped at a bonding strength difference of more than 70 MPa, while it was directly broken at a bonding strength difference of less than 40 MPa; the conglomerate cutting and breaking efficiency was maximized at a triangular prismatic cutter diameter of 16 mm and a back rake angle of 15 ° for both bonding strength differences. The study is theoretically significant for the design of PDC bit with triangular prismatic cutter.

Key words: triangular prismatic cutter, PDC bit, conglomerate formation, rock breaking mechanism, cutter diameter, back rake angle, discrete element method

中图分类号:

TE928

刘笑傲, 邹德永, 王庆, 刘洪山, 黄勇, 陈雅辉. 基于离散元法的砾岩地层三棱齿切削破岩数值模拟[J]. 特种油气藏, 2022, 29(4): 149-155.

Liu Xiaoao, Zou Deyong, Wang Qing, Liu Hongshan, Huang Yong, Chen Yahui. Numerical Simulation of Rock Breaking by Triangular Prismatic Cutter in Conglomerate Formation Based on Discrete Element Method[J]. Special Oil & Gas Reservoirs, 2022, 29(4): 149-155.

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基于离散元法的砾岩地层三棱齿切削破岩数值模拟

Numerical Simulation of Rock Breaking by Triangular Prismatic Cutter in Conglomerate Formation Based on Discrete Element Method

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