Uniaxial compressive strength prediction based on measurement while drilling data: A laboratory study

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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Abstract

The uniaxial compressive strength is one of the most important basic parameters of rock, which is essential for surrounding rock stability analysis and support scheme design of underground engineering. At present, it is time consuming and costly to take a large amount of core samples for laboratory testing, and the mechanical properties of the cores may be affected by mining disturbance, which can easily lead to inaccurate result. The measurement while drilling (MWD) technology provides a new approach to solve the above challenge. The key to implementing this technology is to establish a correlation model between drilling parameters and rock mechanics parameters. Based on the characteristics of polycrystalline diamond compact (PDC) bits in drilling and rock breakage, this paper analyzes the mechanical state of the bit in breaking rock. A theoretical correlation model between the torque, feed force of the bit and the uniaxial compressive strength of the rock has been developed. To verify the accuracy of the theoretical model, the uniaxial compressive strength of five different types of rocks (red sandstone, green sandstone, limestone, marble and shale) was obtained through laboratory mechanical tests. The torque Mb, feed force Fb and other parameters in the drilling process of these five rocks were tested through the newly developed MWD test system. The correlation between the drilling parameters and the uniaxial compressive strength of rock was established. The results showed that the feed force Fb and torque Mb measured at five different types of rocks indicate a linear increasing trend with an increase in depth of cut h. Meanwhile, a strong linear relationship between the feed force Fb and torque Mb is evident. This paper proposes an MWD-based method to rapidly conduct the in-situ measurement of the uniaxial compressive strength of various rocks.

基于钻孔测量数据的单轴抗压强度预测:实验室研究
单轴抗压强度是岩石最重要的基本参数之一,对围岩稳定性分析和地下工程支护方案设计至关重要。目前,采集大量岩心样品进行实验室测试耗时长、成本高,而且岩心的力学性能可能会受到采矿扰动的影响,容易导致结果不准确。边钻边测量(MWD)技术为解决上述难题提供了一种新方法。实施该技术的关键是建立钻探参数与岩石力学参数之间的相关模型。本文基于聚晶金刚石复合片(PDC)钻头在钻进和破岩过程中的特性,分析了钻头在破岩过程中的力学状态。建立了钻头扭矩、进给力与岩石单轴抗压强度之间的理论相关模型。为了验证理论模型的准确性,通过实验室力学试验获得了五种不同类型岩石(红砂岩、绿砂岩、石灰岩、大理岩和页岩)的单轴抗压强度。通过新开发的 MWD 试验系统测试了这五种岩石钻进过程中的扭矩 Mb、进给力 Fb 及其他参数。建立了钻孔参数与岩石单轴抗压强度之间的相关性。结果表明,在五种不同类型的岩石上测得的进尺力 Fb 和扭矩 Mb 随着切削深度 h 的增加呈线性上升趋势。本文提出了一种基于 MWD 的方法,用于快速原位测量各种岩石的单轴抗压强度。
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
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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