Simulation study on the radioactive logging responses in the spiral borehole

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-25 DOI:10.1093/jge/gxae078

Honggang Mi, Yunan Liang, Qiang Sun, Chao Wei, Hongwei Song, Quanying Zhang, Ningchao Li, Xin Nie

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Abstract

The spiral borehole, primarily attributed to uneven force on the drill bit, poses a unique drilling and well logging challenge. In certain logging applications, this phenomenon can disrupt logging responses, introducing periodic fluctuations in the logging curve and complicating the interpretation process. To elucidate the impact of the spiral-borehole phenomenon on conventional radioactive logging methods, we conducted a simulation study examining its effects on traditional density tool (GGD), thermal-neutron porosity tool (TNP), and natural gamma tool (GR). Our findings reveal significant influences on density and porosity tool responses, with the amplitude of periodic fluctuations in logging curves closely linked to the groove depth of the spiral borehole. Conversely, the natural gamma tool exhibits minimal impact, with noticeable spiral-borehole effects causing limited fluctuations. Additionally, when the groove depth of the spiral borehole is fixed, the smaller the distance between the logging tool and the well wall, the closer the value obtained by the logging tool is to the true value of the formation parameter, and vice versa. This research offers theoretical insights for effectively correcting spiral-borehole effects in radioactive logging methods.

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螺旋钻孔放射性测井响应模拟研究

螺旋井眼主要是由于钻头受力不均造成的，给钻井和测井带来了独特的挑战。在某些测井应用中，这种现象会扰乱测井响应，在测井曲线中引入周期性波动，使解释过程复杂化。为了阐明螺旋井眼现象对传统放射性测井方法的影响，我们进行了一项模拟研究，考察其对传统密度仪器（GGD）、热中子孔隙度仪器（TNP）和天然伽马仪器（GR）的影响。我们的研究结果表明，密度和孔隙度仪器的响应受到很大影响，测井曲线周期性波动的幅度与螺旋井眼的槽深密切相关。相反，自然伽马仪器的影响很小，明显的螺旋井眼效应造成的波动有限。此外，当螺旋井眼的井槽深度固定时，测井仪器与井壁之间的距离越小，测井仪器获得的数值越接近地层参数的真实值，反之亦然。这项研究为有效纠正放射性测井方法中的螺旋井眼效应提供了理论依据。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.