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Calculation and analysis of dynamic drag and torque of horizontal well strings

机译：水平井柱动态阻力和扭矩的计算与分析

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摘要

In recent years, shale gas production horizontal well types mainly include conventional horizontal well, highly deviated well and scoop-shape horizontal well. For the sake of construction decision making, it is necessary to study these three types of wells from the aspects of drag and torque characteristic, weight on bit transferring efficiency, key hole sections or links and extreme penetration length. In this paper, these three types of horizontal wells were taken as the study objects. Their drag and torque, load transfer and extended reach drilling were explored based on the dynamic model of full hole drilling string and the simulation calculation of dynamic characteristics of full hole drilling string system. And the results were applied and tested on site in three shale gas wells (a conventional horizontal well, a highly deviated well and a scoop-shape horizontal well) in the Changning area, Sichuan Basin. And the following research results were obtained. First, the contact friction strength of the deeper part of the buildup section in the scoop-shape horizontal well is very high, and it is 1.67 times that of the hold section. The total contact force of buildup section in the scoop-shape horizontal well is 1.62 times that in the highly deviated well. Second, the contact friction strength of the hold section in highly deviated well is not only higher than that of its buildup section, but also higher than any characteristic section in the three well types of the same depth. Third, the operating stress of drilling strings during the drilling of three well types is not high, but during the extended reach drilling in the curved section of the scoop-shape horizontal well, it is necessary to focus on the twist off of drilling string in the hold section. Fourth, the weight on bit transferring efficiency of scoop-shape horizontal well is lower than that of conventional horizontal well and highly deviated well. In conclusion, the research results preliminarily reveal the drag and torque characteristics and active load transferring mechanisms of conventional horizontal well, highly deviated well and scoop-shape horizontal well for shale gas production, and present important hole sections for safety assessment. They can be used as references for efficient and safe construction of shale gas horizontal wells.
机译：近年来，页岩气生产水平井类型主要包括常规水平井，高度偏斜井和sc形水平井。为了进行施工决策，有必要从阻力和扭矩特性，钻头传输效率的权重，关键孔部分或连接以及极端的穿透长度等方面研究这三种类型的井。本文以这三种类型的水平井为研究对象。基于全井眼钻柱动力学模型，对全井眼钻柱系统的动力特性进行仿真计算，研究了它们的阻力，扭矩，载荷传递和大范围钻进。并在四川盆地长宁地区的3个页岩气井（常规水平井，高斜率井和shape形水平井）中进行了现场应用和测试。并获得了以下研究结果。首先，在勺状水平井中，堆积部的较深部分的接触摩擦强度非常高，是保持部的1.67倍。铲形水平井中堆积段的总接触力是高度偏斜井中的总接触力的1.62倍。其次，高度偏斜的井中保持段的接触摩擦强度不仅高于其堆积段的接触摩擦强度，而且还高于相同深度的三种井类型中任何特征段的接触摩擦强度。第三，在三种井型的钻进过程中，钻柱的工作应力不高，但在勺形水平井弯段的延长段钻进过程中，有必要集中注意钻进中的钻柱的扭曲。保留部分。第四，勺状水平井的钻头传输效率的权重比常规水平井低，且偏差很大。总之，研究结果初步揭示了页岩气生产中常规水平井，高斜度井和勺形水平井的阻力，扭矩特性和主动荷载传递机制，并提出了重要的安全评价孔段。它们可以用作页岩气水平井高效安全施工的参考。

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