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基于压缩感知的随钻测井编码传输方法

DOI: 10.6038/cjg20130135, PP. 335-347

Keywords: 随钻测井,压缩感知,测井数据编码

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Abstract:

随钻测井是一种能在钻头钻进过程中通过安装在钻头附近的传感器实时获取和传输测井数据的技术.实时可靠高效的传输测井数据是随钻测井研究领域的关键问题.目前随钻测井系统普遍使用的测井数据传输方式是钻井液压力脉冲遥测传输.钻井液信道是一种长时延极低速单向无反馈删除信道,因此利用传统的差错控制方法无法在保障测井数据传输实时性的同时纠正信道噪声引起的实时测井数据传输错误.为此本文提出了一种基于压缩感知理论的随钻测井数据信道编码传输方法,该方法具有短码长线性编译码复杂度的优点.地面接收端通过压缩感知重构算法恢复井下测井数据,在保障测井数据传输实时性的同时使得地面施工人员能在随机删除信道条件下正确的获得全部井下实时测井数据.钻井现场真实测井数据编码实验表明,本文所提方法在不影响测井数据传输实时性的前提下大大提高了测井数据的抗信道删除能力,降低了由于信道删除带来的测井数据丢包率,而且允许测井施工人员根据实际钻井液信道状态灵活调整发送码率,以实现不同删除概率信道下的测井数据可靠传输.

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