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首页> 外文期刊>Journal of ambient intelligence and humanized computing >Numerical modeling of electromagnetic wave logging while drilling in deviated well
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Numerical modeling of electromagnetic wave logging while drilling in deviated well

机译：斜井随钻电磁波测井数值模拟

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摘要

Electromagnetic wave logging-while-drilling (LWD) tools are used in geosteering for hydrocarbon exploration. Comparing with vertical wells, the response of logging has widely changed because the electrical parameters surrounding the borehole are nonaxisymmetrical distribution in deviated well. In this paper, with the method of alternating-direction-implicit finite-difference time-domain (ADI-FDTD), we discuss the logging response of electromagnetic wave LWD in deviated well, three-dimensional Yee's non-uniform staggered grid is used in cylindrical coordinates, transfer coordinate system is built between strata space and instrument space, which the conductivity tensor of the anisotropic and dipping formation can be expressed in coordinates of instrument, the method of area weighted average is used to compute the effective conductivity of partially-filled grid cells at interfaces, and uniaxial perfectly matched layer (UPML) absorbing boundary conditions is used to truncate the computational domain. Result shows that horn of logging response curve is appeared on both upper and lower boundaries, when electromagnetic wave LWD tool penetrating through the boundary with large dipping angle, and this horn is used to indicate the presence of formation boundaries. What's more, with the eccentric distance increases, horns effect of the boundary is more obvious.
机译：随钻电磁波测井（LWD）工具用于地质导向中，用于油气勘探。与垂直井相比，由于井眼周围的电参数在偏斜井中呈非轴对称分布，因此测井响应发生了很大变化。本文采用交替方向隐式时域有限差分法（ADI-FDTD），讨论了电磁波随钻测井在斜井中的测井响应，采用三维Yee非均匀交错格网。圆柱坐标系，在地层空间与仪器空间之间建立传递坐标系，可以用仪器坐标表示各向异性和倾角形成的电导率张量，采用面积加权平均法计算部分填充的有效电导率界面处的网格单元和吸收边界条件的单轴完美匹配层（UPML）用于截断计算域。结果表明，当电磁波随钻测井仪以较大的倾角穿过边界时，测井响应曲线出现在上下边界上，并以此来指示地层边界的存在。而且，随着偏心距的增加，边界的角效应更加明显。

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