在强磁场梯度下移动样品的扩散系数测量.
Agide Gimenez Marassi1, Arthur Gustavo de Araújo-Ferreira1, Everton Lucas-Oliveira1
1São Carlos Institute of Physics, University of São Paulo São Carlos São Paulo Brazil.
Journal of magnetic resonance (San Diego, Calif. : 1997)
|January 13, 2025
概括
这项研究解决了使用核磁共振 (NMR) 记录在钻井 (LWD) 时测量流体扩散系数的挑战. 提出了解决方案,以准确预测扩散系数,尽管工具移动和磁场梯度.
科学领域:
- 地质物理学 地质物理学
- 石化物理学 石化物理学
- 核磁共振是一种核磁共振.
背景情况:
- 核磁共振 (NMR) 对于评估油井经济可行性至关重要.
- 线路记录 (WL) 和钻井时记录 (LWD) 是主要的NMR数据采集方法.
- 由于工具运动 (转移,旋转,振动),LWD NMR测量面临着挑战.
研究的目的:
- 开发和验证一个模拟NMR测量LWD条件的设置.
- 研究LWD运动对扩散系数测量的影响.
- 提出在LWD条件下准确确定扩散系数的解决方案.
主要方法:
- 开发了一个模拟LWD工具运动 (侧面运动) 的设置.
- 使用单面磁铁,射频探头和机械装置.
- 研究了批量样本和岩层 (丰田布鲁砂岩,比利亚砂岩,印第安纳石灰岩).
- 采用了与样本运动同步的哈恩旋回回声序列.
主要成果:
- 证明了在散装和多孔介质中精确和准确地预测流体扩散系数.
- 鉴定了由于样本移动而导致的信号相调节作为LWD扩散测量的关键挑战.
- 验证了同步的Hahn旋转回声实验在克服运动诱导的文物方面的有效性.
结论:
- 在LWD条件下,通过适当的同步技术,可以实现精确的扩散系数测量.
- 开发的方法为在钻井过程中基于NMR的可靠石化物理分析提供了一条途径.
- 这项研究提高了LWD NMR在石油工业中的理解和应用.
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