模拟月岩条件下钻进过程中热传递机理研究

发布时间：2018-02-09 01:59

本文关键词： 模拟月岩切削过程热传递机理红外热像仪　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：为深入了解钻进过程中热量的分布规律,本文对钻头切削模拟月岩的传热过程进行分析,建立了钻头-月岩-岩屑的导热微分方程组,找出影响钻头工作温度的因素,得到了钻头切削过程中的温度解析式和计算方法,然后分析钻头切削月岩过程的热功转换形式,得到热量分配模式,进行解析计算,代入经验计算参数,得到了有关钻头温度的数学表达式,确定了钻压、转速、给进速度对钻头温度的影响。为了简化计算,在钻压和转速保持稳定的情况下,得到钻头温度和给进速度的平方根是正比例关系。根据月岩的性质参数,本文在实验中所用的模拟月岩选择为力学性质和可钻性等级与月岩基本一致的大理岩,通过实验对大理岩的力学参数进行测试,利用vic-3d非接触全场应变测量系统对大理岩的弹性模量和泊松比进行测量,vic-3d系统是一种数字图像技术,在实验中能够得到被测试材料表面的应变和位移的分布,能够有效的得到岩石的弹性模量和泊松比,并且节约时间和成本。最后通过室内模拟实验,利用红外热像仪对半孔钻进过程进行热像图形采集,得到模拟月岩钻取采样过程中热量分布规律,通过对岩石的温度场的分析描述,得到岩石温度场的形状特点为弹头状分布,并且靠近钻头的岩石温度较高,远离钻头的岩石温度向两边逐渐降低。通过对钻头温度场的分析描述,得到钻进过程中钻头的温度分布,随着钻进过程的进行,钻头的温度在短暂的时间内迅速升高,然后进入稳定状态,对稳定状态下的钻头温度进行分析,与计算结果进行对比,验证钻头切削岩石的温度和给进速度的关系。
[Abstract]:In order to deeply understand the distribution of heat in drilling process, the heat transfer process of bit cutting simulated moon rock is analyzed in this paper, and the heat conduction differential equations of bit, moon rock and cuttings are set up, and the factors influencing the working temperature of bit are found out. The analytical formula and calculation method of temperature during bit cutting are obtained, and then the thermal power conversion form of bit cutting moon rock is analyzed, the heat distribution mode is obtained, the analytical calculation is carried out, and the experiential calculation parameters are added. The mathematical expression of bit temperature is obtained, and the influence of drilling pressure, rotating speed and feed velocity on bit temperature is determined. In order to simplify the calculation, while the drilling pressure and rotating speed remain stable, It is obtained that the square root of bit temperature and feed velocity is proportional. According to the property parameters of lunar rock, the simulated lunar rock used in this paper is chosen as marble with mechanical properties and drillability grade basically consistent with lunar rock. The measurement of elastic modulus and Poisson's ratio of marble by vic-3d non-contact full-field strain measurement system is a digital image technique. In the experiment, the strain and displacement distribution on the surface of the tested material can be obtained, the elastic modulus and Poisson's ratio of rock can be obtained effectively, and the time and cost can be saved. The thermal image of half-hole drilling process is collected by infrared thermal imager, and the heat distribution in the sampling process of simulated lunar rock drilling is obtained. By analyzing and describing the temperature field of rock, the shape characteristic of rock temperature field is warhead distribution. And the rock temperature near the bit is higher, and the rock temperature away from the bit gradually decreases to both sides. Through the analysis and description of the bit temperature field, the temperature distribution of the bit in the drilling process is obtained, with the drilling process going on, The temperature of the bit rises rapidly in a short time and then enters a stable state. The temperature of the bit in the stable state is analyzed and compared with the calculated results to verify the relationship between the temperature of the bit cutting the rock and the feeding velocity.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P184.5;P634

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