Widening Drilling Operation: Performance Analysis on the Application of Fixed Cutter Drill Bits in Hard Rock Formation

J. De Moura, Yingjian Xiao, Daiyah Ahmed, Jie Yang, S. Butt
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引用次数: 2

Abstract

This study is an evaluation of drilling mechanisms for widening drilling operations, which are also called hole opening or enlarge drilling operations, in hard rock formations during drilling operation with fixed cutter bits. This paper focuses on correlating drilling performance, or Rate of Penetration (ROP), with drilling parameters such as Weight on Bit (WOB), rotary speed, Torque on Bit (TOB) and bit type. Laboratory Drill-Off Tests (DOT) were conducted using a drilling simulator. Natural granite specimens were penetrated using different types of fixed cutter bits with different diameters. Various magnitudes of WOB were applied during these drilling experiments in order to study drilling performance in this type of formation. A well-organized drilling experimental plan was proposed to cover both procedures of pilot holes and widening drilling operations. Comparison were made between performance conditions obtained during the drilling operations of pilot holes and similar conditions during widening drilling operations. Furthermore, bit-rock interaction was studied by comparing experimental data with that obtained from empirical models. The focus of this paper was to analyze the ROP during each stage of the widening drilling operations of a pilot hole and its correlation with other parameters. The applicability of current empirical models and their limitations in widening drilling operations in hard rock formation was analyzed. In this way, this drilling model is applied in widening drilling operations of hard rock formation with fixed cutter bits.
扩孔作业:固定齿钻头在硬岩地层中的应用性能分析
本研究是对硬岩层固定切削钻头钻井作业中扩孔作业(也称为开孔或扩孔作业)的钻井机理进行评价。本文的重点是将钻井性能或钻速(ROP)与钻压(WOB)、转速、扭矩(TOB)和钻头类型等钻井参数相关联。利用钻井模拟器进行了实验室钻脱试验(DOT)。采用不同类型、不同直径的固定切削钻头对天然花岗岩试样进行了钻孔。为了研究这类地层的钻井性能,在钻井实验中采用了不同的钻压量级。提出了一个组织良好的钻井实验计划,以涵盖先导孔和扩大钻井作业的程序。将导孔钻井过程中获得的性能条件与扩孔钻井过程中获得的性能条件进行了比较。此外,通过对比实验数据与经验模型得到的数据,研究了钻头与岩石的相互作用。本文的重点是分析导孔扩眼作业各阶段的机械钻速及其与其他参数的相关性。分析了现有经验模型在硬岩层加宽钻井作业中的适用性及其局限性。将该钻井模型应用于硬岩层固定切削钻头加宽钻井作业中。
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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