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首页> 外文期刊>Journal of natural gas science and engineering >Theoretical and experimental study on the penetration rate for roller cone bits based on the rock dynamic strength and drilling parameters
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Theoretical and experimental study on the penetration rate for roller cone bits based on the rock dynamic strength and drilling parameters

机译：基于岩石动强度和钻井参数的牙轮钻头钻进速率的理论和实验研究

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摘要

Roller cone bits have been used extensively in petroleum and natural gas mining, and the accurate prediction of their rate of penetration (ROP) is of crucial importance for improving drilling quality and reducing drilling cost. In this study, a new prediction model of the ROP considering the combined effect of the main drilling parameters and rock dynamic compressive strength is developed for roller cone bits. The model is derived based on the mechanism of rock fragmentation under a single tooth impact indentation. The newly introduced ROP model is different from others in that it replaces the rock static strength with rock dynamic compressive strength and can reflect the real process of rock dynamic crushing by a roller cone bit. The results of theoretical analysis show that the ROP linearly correlates with the bit rotary speed; the relationship between the ROP and weight on bit (WOB) is 3/2 power, and the relationship between the ROP and rock dynamic compressive strength is -3/2 power. Furthermore, lab drilling tests on sandstone and limestone are carried out with a full-scale bit drilling testing machine, and the influence laws of WOB, rotary speed and rock dynamic strength on the ROP are analyzed. In addition, the theoretical ROP values calculated based on the rock dynamic compressive strength and static compressive strength are compared with the experimental ROP values. The results from the tests indicate that the experimental ROP values are basically consistent with the theoretically derived values, and the comparative results show that the theoretical ROP values calculated according to the rock dynamic compressive strength are closer to the actual values with, an average relative error below 15%, signifying that the newly established ROP model in this paper is valid and can be used to predict the drilling rate with reasonable accuracy and can be used to provide useful guidance for optimizing drilling parameters. (C) 2016 Elsevier B.V. All rights reserved.
机译：牙轮钻头已广泛用于石油和天然气开采，准确预测其钻速（ROP）对于提高钻探质量和降低钻探成本至关重要。在这项研究中，开发了一种新的ROP预测模型，该模型考虑了主要钻削参数和岩石动态抗压强度的综合影响，用于牙轮钻头。该模型是基于单齿冲击压痕作用下岩石破碎的机理得出的。新引入的ROP模型与其他模型的不同之处在于，它用岩石动态抗压强度代替了岩石静态强度，并且可以反映出用牙轮钻头破碎岩石的真实过程。理论分析结果表明，机械钻速与钻头转速成线性关系。 ROP与钻压（WOB）之间的关系为3/2次方，而ROP与岩石动态抗压强度之间的关系为-3/2次方。此外，用一台全尺寸钻头试验机对砂岩和石灰岩进行了实验室钻探试验，并分析了WOB，转速和岩石动强度对ROP的影响规律。另外，将基于岩石的动态抗压强度和静态抗压强度计算出的理论ROP值与实验ROP值进行了比较。试验结果表明，实验ROP值与理论推导值基本吻合，比较结果表明，根据岩石动态抗压强度计算的ROP理论值更接近实际值，平均相对误差较大。低于15％，表明本文建立的ROP模型是有效的，可用于以合理的精度预测钻速，并可为优化钻井参数提供有用的指导。 （C）2016 Elsevier B.V.保留所有权利。

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