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首页> 外文会议>SPE Russian Petroleum Technology Conference and Exhibition >High-Frequency LWD Electromagnetic Measurements Applied to Studying Macroanisotropic Properties of Thin-Bedded Sedimentary Deposits
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High-Frequency LWD Electromagnetic Measurements Applied to Studying Macroanisotropic Properties of Thin-Bedded Sedimentary Deposits

机译：高频LWD电磁测量应用于研究薄层沉积沉积沉积沉积物的宏观偶像性质

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This paper discusses the development of interpretation base in case of high-frequency electromagnetic logging-while-drilling (LWD) data acquired from deviated and horizontal boreholes. The aim of the work is to analyze the capability of revealing thinly bedded intervals as potentially hazardous when drlilling highly deviated boreholes and conducting multistage hydraulic fracturing. The main challenges are related to the numerical simulation and inversion of electromagnetic LWD data for determining the electrical macroanisotropy of thinly bedded sequences. To tackle the problem of detecting such intervals, characterized by the alternation of beds with various lithological compositions, we apply high-frequency electromagnetic LWD. The problem is possible to solve since the interlayers are characterized by different electric resistivities, the high-frequency sondes have fine resolution, and the developed simulation algorithms are highly accurate and effective. The basic model we consider is that of a horizontally layered anisotropic medium, taking into account the tool deviation relative to horizontal boundaries. We perform the numerical analysis of electromagnetic signals in typical models of macroanisotropic layers, as well as the numerical interpretation of practical LWD data from highly deviated boreholes of Western Siberia. For directional drilling of horizontal boreholes with complex trajectories in thinly bedded intervals and for studying their electric macroanisotropy we have developed highly effective algorithms and software for the simulation, processing and interpretation of high-frequency electromagnetic logs recorded during drilling. To substantiate the possibility of estimation of the electrical macroanisotropy factor we have conducted the numerical simulation and analysis of the electromagnetic signals and their sensitivity functions in typical geoelectric models. In such a way, it is shown that the phase shift and attenuation in a horizontal interval penetrated electrically macroanisotropic section have sufficient sensitivity to the vertical resistivity of a formation, as well as to the locations of its top and bottom. This fact enables revealing thinly layered intervals during drilling. As a result, we have shown that the values of the geoelectric parameters (vertical and horizontal resistivities, positions of boundaries) are determined with high accuracy. The scientific and practical significance of the work at hand is determined by the necessity of improving the safety of construction of deviated and horizontal boreholes and conducting multistage hydraulic fracturing, as well as the development of interpretation base for high-frequency electromagnetic LWD.
机译：本文讨论了从偏离和水平孔中获取的高频电磁记录的钻井（LWD）数据的情况下解释基础的开发。这项工作的目的是分析透露均匀的间隔的能力，在脱阵高度偏离的钻孔和传导多级液压压裂时，潜在危险。主要挑战与电磁LWD数据的数值模拟和反演有关，用于确定薄层嵌入式序列的电显微镜。为了解决检测这种间隔的问题，其特征在于具有各种岩性组合物的床的交替，我们应用高频电磁LWD。由于中间层的特征在于不同的电阻性，因此可以解决问题，高频钻石具有精细分辨率，并且开发的仿真算法具有高精度且有效。我们认为的基本模型是水平分层各向异性介质，考虑到相对于水平边界的刀具偏差。我们在典型的宏观分子层模型中进行了电磁信号的数值分析，以及来自西西堡西高度偏离钻孔的实用LWD数据的数值解释。对于具有薄层间隔的复杂轨迹的横向钻孔的定向钻孔，用于研究其电动扫描功能，我们开发了高效的算法和软件，用于钻井期间记录的高频电磁日志的仿真，处理和解释。为了证实，我们在典型的电气模型中估算了电磁信号的估计的可能性及其对电磁信号的数值模拟及其敏感功能。以这种方式，示出了水平间隔穿透的电气间隔剖面的相移和衰减具有足够的敏感性对形成的垂直电阻率，以及其顶部和底部的位置。这一事实使得能够在钻井期间揭示层叠的间隔。结果，我们已经示出了高精度确定地电参数（垂直和水平电阻，边界位置）的值。手工作业的科学和实践意义是通过提高偏离和水平钻孔的建设安全和进行多级液压压裂的安全性的必要性，以及高频电磁LWD的解释基础的开发。

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