Design and tests of a borehole radar for oil well prospecting

Proceedings of the 15th International Conference on Ground Penetrating Radar Pub Date : 2014-12-04 DOI:10.1109/ICGPR.2014.6970535

J. Huo, Qing Zhao, Chunguang Ma, Xu Sun, Likai Wang, Yong Bo, X. Chang, Yong-gang Zhao

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引用次数: 2

Abstract

Based on the operational principles of ground penetrating radar (GPR) and the practical demanding of well prospecting, we designed an integrated borehole radar system which is assembled by antennas, transmitter, receiving system, and ground data processing sections. The transmission signal of this system is nanosecond, and the frequency of echo signal is high. It requires that, when the real-time sampling method is adopted, the conversion rate of A/D converter should be greater than 1 GHz. Therefore, we used an equivalent time sampling method. A borehole radar system was assembled by above mentioned components and tested in an actual oil well. The obtained data was processed and compared with that obtained by conventional logging instruments. Well coherent results were obtained. It proved this borehole radar system is able to identify the formation of abnormal points and different layers. Moreover, the detection range of the radar system, is longer than 5 m, is much better than that of the conventional logging instruments. It convinced that this system has foreseeable potential in oil well prospecting.

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油井勘探用钻孔雷达的设计与试验

根据探地雷达的工作原理和探井的实际需求，设计了一套由天线、发射机、接收系统和地面数据处理部分组成的综合钻孔雷达系统。该系统的传输信号为纳秒级，回波信号频率高。要求在采用实时采样方式时，A/D转换器的转换速率应大于1ghz。因此，我们采用等效时间采样方法。将上述部件组装成井眼雷达系统，并在一口实际油井中进行了测试。对所得资料进行了处理，并与常规测井资料进行了对比。获得了较好的相干结果。实践证明，该钻孔雷达系统能够识别异常点和不同层位的形成。此外，雷达系统的探测距离超过5 m，大大优于常规测井仪器。证明该系统在油井勘探中具有可预见的潜力。

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Proceedings of the 15th International Conference on Ground Penetrating Radar

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