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首页> 外文会议>SPE Annual Technical Conference and Exhibition >Correcting LWD Propagation Resistivity Logs in Horizontal Sinusoidal Wells for Better Water Saturation Estimate: Case Study in a Deepwater, Channelized Turbidite Reservoir
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Correcting LWD Propagation Resistivity Logs in Horizontal Sinusoidal Wells for Better Water Saturation Estimate: Case Study in a Deepwater, Channelized Turbidite Reservoir

机译：校正水平正弦井中的LWD传播电阻率为更好的水饱和度估计：深水，通道化浊度储层的案例研究

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Today’s advanced drilling and geosteering technologies have enabled high-angle horizontal (HAHZ) wells to become common and routine. However, quantitative petrophysical analysis in such an environment is still lagging behind, mainly because of the complexities of the tool response, the lack of fast modeling capabilities and fit-for-purpose softwares. In deepwater channelized turbidite reservoirs, where lateral heterogeneities can be great, a strategy for reducing horizontal well placement risk is the use of sinusoidal pilots. The high deviation angle between the logging while drilling (LWD) tool axis and the formation bedding introduces uncertainty and inaccuracy in the resistivity measurements. These can make petrophysical analysis in HAHZ wells difficult, especially when there are no offset vertical wells available. It is thus necessary that these well deviation effects be corrected before a petrophysical analysis is conducted. In this paper, we first review the tool response characteristics of LWD resistivity logs in HAHZ wells. Then we present a practical workflow to correct for the well deviation effects on LWD resistivity logs through an efficient, highly interactive software, illustrated by both a synthetic data set and several real world examples. It is shown that using this workflow, which can be defined as an interactive inversion, the raw resistivity logs can be significantly corrected to values closer to the true formation resistivity (Rt). The use of Rt instead of the LWD resistivity logs for calculating water saturation (Sw) yields more accurate Sw numbers, which in turn reflect in more accurate reserves estimation. The main challenge is there are still about 30% of logs in the study area are beyond the repair. The development of new hardware with more information content is deserved to address the issue.
机译：今天的先进钻井和地蹄技术已经使高角度水平（HAHZ）井成为常见和常规。然而，这种环境中的定量岩石物理学分析仍然滞后，主要是因为工具响应的复杂性，缺乏快速的建模能力和适合用途软件。在深水通道化的浊度储层中，横向异质性可以很大，可以减少水平井放置风险的策略是使用正弦飞行员。钻孔（LWD）工具轴和地层床上用品之间的测井之间的高偏差角在电阻率测量中引入了不确定性和不准确性。这些可以在哈哈井中进行岩石物理分析困难，特别是当没有抵消垂直井时。因此，在进行岩石物理学分析之前，必须纠正这些良好的偏差效应。在本文中，我们首先审查了Hahz Wells中LWD电阻率日志的刀具响应特性。然后，我们提出了一种实用的工作流程，以通过合成数据集和几个现实世界示例所示的高效，高度交互式软件来校正对LWD电阻率日志的良好偏差效应。结果表明，使用该工作流程，可以定义为交互式反转，可以显着校正原始电阻率日志，以更接近真正的形成电阻率（RT）的值。使用RT而不是用于计算水饱和度（SW）的LWD电阻率日志产生更精确的SW数字，这反映在更准确的储备估计中。主要挑战是研究区域超出了大约30％的日志超出了维修。具有更多信息内容的新硬件的开发应应对解决问题。

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