岩心定向检测仪的设计与实验研究

Design and Test of the Drill Core Orientation Detector

本文设计了一种基于机械法的岩心定向仪。机械部分采用三把刻刀在岩心上刻标记线,作为岩心方位的基准线;电路部分以ATmega8单片机为控制核心,用HMR3300传感器随钻测得靠近岩心管的仪器仓的俯仰角和侧滚角,间接测得岩心的俯仰角和侧滚角,存于U盘。介绍了HMR3300与刻刀的安装关系,推导了高边工具面角的计算方法,并通过实验找到HMR3300不同安装方式下,高边工具面角真值φ'与计算值φ间的关系,岩心方位角与测井得到的孔斜方位角ψ和高边工具面角真值φ'的关系,依此PC机编程计算得岩心方位角。实验表明,在井眼顶角大于1°时,其测量平均误差能够控制在3°以内,并可稳定工作,基本满足工程要求。

A drill core orientation detector is designed based on mechanical principle. In its mechanical part,three gravers are used to sculpture marks on drilling cores,which serve as the baselines of core orientations.The instrument＇s control core is an ATmega8 microchip,and a HMR3300 sensor is used to measure roll and pitch of the instrument relative to horizontal plane and to get those of the drilling core indirectly which are saved onto USB. In this paper,the installing method of HMR3300 and the gravers are presented.Calculation formula of the tool high-facing-angle is deduced.Then mathematical relations between the true value and calculated value of tool high-facing-angle,and between drilling core azimuth and inclined hole azimuth are determined. Based on these results,the drilling core azimuth calculation program is compiled. The measurement test shows that when the hole vertex angle is greater than 1 degree,the average measurement error is less than 3 degree.It meets largely the requirement of engineering.