Research on kinematics analysis of spherical single-cone PDC compound bit and rock breaking simulation verification

IF 1.8 4区工程技术 Q4 ENERGY & FUELS

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles Pub Date : 2021-01-01 DOI:10.2516/ogst/2021034

Chunyan Kong, Rongjun Zhu, Derong Zhang, Shuangshuang Li

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引用次数: 0

Abstract

The single-cone bit has become the first choice for slim hole sidetracking and deep well drilling with its unique rock breaking method and high ROP (Rate Of Penetration), with its main failure mode being of early excessive wear of the cutting teeth. In order to improve the adaptability of single-cone bits to hard and highly abrasive formations, a spherical single-cone Polycrystalline Diamond Compact (PDC) compound bit is designed. According to the characteristics of the tooth profile, the way of tooth arrangement and the way of contact between the cutting teeth and the rock, the acceleration equation to the cutting teeth of the spherical single-cone PDC compound bit is established. The acceleration of the single-cone bit is verified by numerical simulation experiment of rock-breaking. The shaft inclination angle of the cone, the position and height of the PDC teeth, the radius of the PDC teeth, the lateral rotation angle and the front inclination angle on the acceleration are studied. The results show that as the shaft inclination angle increases, the bit transmission ratio gradually increases, and the harder the rock formation, the larger the transmission ratio of the single-cone bit; the shaft inclination angle and the position of the PDC tooth have a greater influence on the acceleration of the PDC tooth, and the radius, lateral rotation angle and front inclination angle of the PDC tooth have a small influence on the acceleration of the PDC tooth; rock properties have an impact on the acceleration of the cutting teeth, with the acceleration of the cutting teeth in hard rock formations being higher than that in soft rock formations; near the top of the cone, the absolute acceleration of the cutting teeth will fluctuate sharply and cause severe wear of the cutting teeth, so the tooth distribution in this area should be strengthened; on the premise that the bearing life of the single-cone bit is allowed, the value of the shaft inclination angle β can be approached to 70°. The relative error between the theoretical analysis results of the acceleration of the PDC cutter and the rock-breaking simulation experiment results is between −0.95% and −2.24%. This research lays a theoretical foundation for the dynamic research of spherical single-cone PDC compound bit.

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球形单锥PDC复合钻头运动学分析及破岩仿真验证研究

单牙轮钻头以其独特的破岩方式和较高的机械钻速(ROP)成为小井侧钻和深井钻井的首选钻头，其主要失效模式是切削齿早期过度磨损。为了提高单牙轮钻头对坚硬、高磨蚀性地层的适应性，设计了一种球形单牙轮PDC复合钻头。根据齿形特点、排齿方式以及切削齿与岩石的接触方式，建立了球形单锥PDC复合钻头切削齿的加速度方程。通过破岩数值模拟实验验证了单牙轮钻头的加速度。研究了锥体轴倾角、PDC齿的位置和高度、PDC齿的半径、侧向旋转角度和前倾角对加速度的影响。结果表明:随着轴倾角的增大，钻头传动比逐渐增大，地层越硬，单牙轮钻头传动比越大;轴倾角和PDC齿的位置对PDC齿的加速度影响较大，而PDC齿的半径、横向旋转角度和前倾角对PDC齿的加速度影响较小;岩石性质对切削齿加速度有影响，硬岩层中切削齿加速度大于软岩层;在锥体顶部附近，切削齿的绝对加速度会剧烈波动，造成切削齿的严重磨损，因此应加强该区域的齿分布;在允许单牙轮钻头轴承寿命的前提下，轴倾角β值可接近70°。PDC切削齿加速度理论分析结果与破岩模拟实验结果的相对误差在−0.95% ~−2.24%之间。该研究为球面单锥PDC复合钻头的动力学研究奠定了理论基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 工程技术-工程：化工

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： OGST - Revue d''IFP Energies nouvelles is a journal concerning all disciplines and fields relevant to exploration, production, refining, petrochemicals, and the use and economics of petroleum, natural gas, and other sources of energy, in particular alternative energies with in view of the energy transition. OGST - Revue d''IFP Energies nouvelles has an Editorial Committee made up of 15 leading European personalities from universities and from industry, and is indexed in the major international bibliographical databases. The journal publishes review articles, in English or in French, and topical issues, giving an overview of the contributions of complementary disciplines in tackling contemporary problems. Each article includes a detailed abstract in English. However, a French translation of the summaries can be provided to readers on request. Summaries of all papers published in the revue from 1974 can be consulted on this site. Over 1 000 papers that have been published since 1997 are freely available in full text form (as pdf files). Currently, over 10 000 downloads are recorded per month. Researchers in the above fields are invited to submit an article. Rigorous selection of the articles is ensured by a review process that involves IFPEN and external experts as well as the members of the editorial committee. It is preferable to submit the articles in English, either as independent papers or in association with one of the upcoming topical issues.