煤田地质与勘探

2025, v.53;No.326(02) 213-222

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随钻钻进参数优化下煤体原位应力响应特征解析
Analyzing in-situ stress response characteristics of coals based on optimized measurement-while-drilling parameters

张琨,王珂,任建喜,冯上鑫,常鹏博,赵玉桃,苗彦平,胡俭
ZHANG Kun,WANG Ke,REN Jianxi,FENG Shangxin,CHANG Pengbo,ZHAO Yutao,MIAO Yanping,HU Jian

摘要(Abstract):

【背景】井下煤体应力空间分布状况是影响矿井安全生产和采掘工艺优化的重要因素之一,实现煤体应力定量且超前的原位预测,对于精准调控井下应力场、划分冲击危险区域意义重大。【方法】利用自主研发的随钻监测系统,开展不同钻进工况条件下的煤岩钻孔室内试验,探究不同应力条件下钻进工况对钻进参数(扭矩、钻进位移)的作用规律,进而提出基于钻进参数的煤体应力测定方法,并开展了井下原位工程应用实践。【结果和结论】结果表明:(1)在钻进过程中,随钻监测系统可在干扰钻进工艺下实时监测钻进参数。钻进过程中钻进速度与钻压呈负相关关系,与扭矩呈正相关关系。(2)构建的钻进指标与煤体应力大小的函数关系拟合效果良好,拟合度达R2=0.92。(3)井下原位工程验证发现,基于钻进参数煤体应力预测值和煤体应力实际值平均差异率小于10%,具有较好的一致性。该研究验证了基于钻进参数测定煤体应力的可靠性,也为实现煤体应力原位数字钻探技术提供了科学参考。
[Background] The spatial distribution of stress in coals in underground coal mines is a significant factor influencing the safe production of mines and the optimization of mining processes. The quantitative, advanced prediction of in-situ stress in coals is significant for the precise regulation of the underground stress field and the classification of areas with rock burst risks. [Methods] Using the self-developed monitoring-while-drilling system, this study conducted indoor coal drilling experiments under different drilling conditions and explored the laws of effects of drilling conditions on drilling parameters(e.g., torque and drilling displacement) under varying stresses. Furthermore, this study developed a method for determining coal stress based on drilling parameters and verified this method through the in-situ engineering application in an underground coal mine. [Results and Conclusions] The results indicate that the monitoring-while-drilling system could monitor the drilling parameters in real time in the presence of disturbance to the drilling process. In the drilling process, the drilling rate negatively correlated with the weight on bit(WOB) but positively correlated with the torque. The functional relationship between the drilling indices and the stress in coals exhibited a high goodness of fit(R2 = 0.92). The in-situ engineering application revealed that the differences between the stress in coals predicted based on drilling parameters and the actual stress were less than 10%, suggesting relatively high consistency.This study demonstrates that it is reliable to determine the stress in coals based on drilling parameters and also provides a scientific reference for the development of in-situ digital drilling technology for determining stress in coals.

关键词(KeyWords): 随钻测试;钻进参数;煤体原位应力;响应特征
test while drilling;drilling parameter;in situ stress in coal;response characteristic

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年项目(52309143);; 中国博士后科学基金面上项目(2022MD723827)

作者(Author): 张琨,王珂,任建喜,冯上鑫,常鹏博,赵玉桃,苗彦平,胡俭
ZHANG Kun,WANG Ke,REN Jianxi,FENG Shangxin,CHANG Pengbo,ZHAO Yutao,MIAO Yanping,HU Jian

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