时域积分的LWD振动加速度处理电路  

LWD Vibration Acceleration Processing Circuit Based on Time- domain Integration

作　　者：程晶晶[1] 高双[1] 范云龙[1] 张嘉伟[2] 

机构地区：[1]华中科技大学自动化学院,湖北武汉430074 [2]中海油田服务股份有限公司油田技术研究院,北京101149

出　　处：《自动化仪表》2016年第12期1-4,9,共5页Process Automation Instrumentation

基　　金：高等学校博士学科点专项科研基金资助项目(编号:20130142120065)

摘　　要：根据随钻测井(LWD)仪器的振动位移对随钻测井数据进行评估,是提高随钻测井准确性的有效方法。研制了一种基于时域积分方法的加速度信号处理电路,其可在井下实时测量随钻测井仪器的振动加速度,再通过积分计算获得井下实时振动位移。该电路的数字信号处理器件选用高可靠性的32位定点DSP器件TMS320F2812,加速度信号处理方法选用占用资源少、便于微型系统实时计算的时域积分方法,再采用拟合多项式极值方法,消除了积分中产生的趋势项误差。振动测试表明,该加速度测量电路所得的位移时程曲线与理论值曲线拟合的精度较高,能满足随钻测井仪器位移测量的需求。According to the vibration displacement of logging while drilling( LWD) instrument,the LWD data is evaluated,which is an effective method to improve measurement accuracy for the logging data. An acceleration signal processing circuit based on time- domain integration is researched and developed to measure the real- time vibration acceleration of LWD instrument,and then obtain the real- time vibration displacement by integral calculation. The high reliability 32 bit fixed- point DSP TMS320F2812 is selected to be the digital signal processing component; and the time domain integral method is selected to be the processing method for acceleration signal,because it takes less resource and is convenient for real- time calculation of micro system. Then,the method of fitted polynomial extreme value is used to eliminate the trend error generated in integration. The vibration test shows that the fitting accuracy for the displacement vs. time curve obtained by this acceleration measurement circuit and the curve of the theoretical values is higher,which can meet the demands for displacement measurement of LWD instrument.

关 键 词：随钻测井(LWD) 振动加速度 信号处理 DSP 时域积分 傅里叶变换 趋势项误差 

分 类 号：TH86[机械工程—仪器科学与技术] TP216[机械工程—精密仪器及机械]