随钻核磁共振井下快速反演算法设计  

Design of a rapid algorithm for inversion in NMR logging while drilling tool

作　　者：孟铎[1] 程晶晶[1] 张嘉伟[2] 王光伟[2] 

机构地区：[1]华中科技大学自动化学院测量科学与仪器系,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：《国外电子测量技术》2014年第5期35-39,共5页Foreign Electronic Measurement Technology

基　　金：博士学科点专项科研基金(20130142120065)

摘　　要：与传统电缆核磁共振测井技术相比,随钻核磁共振测井技术可以提供实时地层评价及井眼信息,提供更为科学的油气决策信息。由于受到随钻测井仪器上传速率限制,随钻核磁共振测井仪器必须在井下对大量回波数据进行关键T2谱反演,并将实时反演数据通过泥浆脉冲发生器上传至地面。针对随钻核磁共振必须在井下完成反演的特殊需求,提出了一种适用于井下硬件实现的快速T2谱反演方法,并完成了硬件电路实现。结果表明,该反演方法在对NMR回波信号进行有效T2谱反演的同时,能够很好的满足实时性和精确度要求。Compared with the traditional wire-line NMR logging technology, NMR logging while drilling can provide real-time formation evaluation and borehole information, which is more scientific information for the decision of oil and gas. Due to the limited telemetry bandwidth in logging while drilling （LWD）, the real-time results must be calculated in the tool by performing a full T2 inversion, the results are then transmitted by mud-pulse telemetry to the surface. Based on the special requirement of inversion in NMR LWD, this thesis puts forward a rapid .Algorithm of T2 inversion which is applicable for hardware implementation in NMR LWD, and then gives out a method to realize the hardwire circuit. The results show that the algorithm can implement the T2 inversion and also meet with the requirements of real-time and accuracy in LWD.

关 键 词：随钻核磁共振测井 反演算法 T2谱 实时性 精确度 硬件实现 

分 类 号：TN911.7[电子电信—通信与信息系统]