电磁随钻中传输速率自适应调度方法  

A method for adaptive dispatch of transmission rate in electromagnetic measurement–while-drilling

作　　者：彭烈新[1] 苏义脑 盛利民 李林 弓志谦 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油集团钻井工程技术研究院

出　　处：《石油机械》2010年第10期22-25,94,共4页China Petroleum Machinery

基　　金：国家十一五863计划重大项目子课题"井下无线电磁波随钻测量技术"(2006AA06A103)

摘　　要：针对现有电磁随钻系统存在的浅层钻进对高速数据传输需求以及深井对信号幅度要求的矛盾,提出一种速率自适应调度的方法。在不同地层、不同深度采用不同的信号发射频率,在保证信号幅度的前提下,提高数据传输速率。通过分析电磁信号在地层中的衰减规律,建立单一地层和多地层结构速率调度的数学模型,并给出井下调度参数获取的方法。最后通过仿真比较固定发射频率和自适应传输策略在不同深度和电阻率条件下的数据传输速率。结果表明,使用自适应调度策略能提高数据传输速率1倍以上。In light of the contradiction existing in the current electromagnetic measurement-while-drilling system between the requirement of high-speed data transmission by shallow-layer drilling and the requirement of signal amplitude by deep wells,a method for the auto-adapted dispatch of rate was formulated.In different formations and depths,different signal transmission frequencies were adopted to improve the data transmission rate with the precondition that the signal amplitude can be ensured.Through analysis of the attenuation law of electromagnetic signals in formations,the mathematical model concerning the rate dispatch of mono-formation and multi-formation was established and the method to obtain borehole dispatch parameters was provided.Finally,the data transmission rate of the adaptive transmission strategy was compared with that of the fixed emission frequency in different depths and resistivities by means of simulating.The result indicates that use of adaptive dispatch strategy can improve data transmission rate by one time.

关 键 词：电磁随钻 自适应 传输速率 调度 

分 类 号：TN929.533[电子电信—通信与信息系统]