基于低场核磁共振技术的黏土表面水化水定量测试与分析

doi:10.7623/syxb201904008

石油学报 ›› 2019, Vol. 40 ›› Issue (4): 468-474.DOI: 10.7623/syxb201904008

基于低场核磁共振技术的黏土表面水化水定量测试与分析

苏俊霖¹, 董汶鑫¹, 罗平亚¹, 徐显广², 黄进军¹

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 中国石油集团工程技术研究院有限公司北京 102206

收稿日期:2018-10-02 修回日期:2019-02-15 出版日期:2019-04-25 发布日期:2019-05-07
通讯作者: 苏俊霖,男,1978年12月生,2001年获西南石油学院学士学位,2009年获西南石油大学博士学位,现为西南石油大学副教授,主要从事油田化学和钻井液领域的研究与教学工作。Email:sjlzr2006@163.com
作者简介:苏俊霖,男,1978年12月生,2001年获西南石油学院学士学位,2009年获西南石油大学博士学位,现为西南石油大学副教授,主要从事油田化学和钻井液领域的研究与教学工作。Email:sjlzr2006@163.com
基金资助:
国家科技重大专项（2016ZX05022-001）和中国石油天然气集团有限公司重大应用基础研究（2016A-3903）资助。

Q uantitative test and analysis of clay surface hydration water based on low-field nuclear magnetic resonance technology

Su Junlin¹, Dong Wenxin¹, Luo Pingya¹, Xu Xianguang², Huang Jinjun¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. CNPC Engineering Technology Research & Development Company Limited, Beijing 102206, China

Received:2018-10-02 Revised:2019-02-15 Online:2019-04-25 Published:2019-05-07

摘要/Abstract

摘要：

黏土矿物的水化类型及水化程度研究是目前水基钻井液优快钻进泥页岩地层的重点与难点之一。应用等温吸附实验及黏土层间距变化规律，确定了黏土不同类型水化水的相对平衡压界限；基于低场核磁共振T₂弛豫谱与水分子运动性关系、黏土层间距变化与水化水分子直径的相对关系，确定了T₂值范围所对应的黏土水化类型；根据T₂信号幅值与水分子氢质子数呈正比的原理，建立了T₂值与黏土水含量标准曲线，确定了T₂信号幅度与黏土含水量的定量关系。实验结果表明，经3 500 r/min、离心10 min的饱水钠膨润土的表面水化水、渗透水化水、自由水对应的T₂值范围分别为 8.91~73.17 μs，0.97~10.23 ms，>71.49 ms；上述钠膨润土的表面水化水、渗透水化水、自由水的质量含量比例分别为9.62 %、61.49 %、28.88 %。

关键词: 黏土, 表面水化, 低场核磁共振, 定量测试, 评价

Abstract:

The research on the hydration type and degree of clay minerals is one of the key factors and difficult points for the fast drilling of water-based fluid into shale formation. In this study, the isothermal adsorption experiment and the variation law of clay spacing are applied to determine the relative equilibrium pressure limits of different types of hydration water for clay. Then, based on the relationship between theT₂ relaxation spectrum of low-field nuclear magnetic resonance and the mobility of water molecules as well as the relative relationship between the changes in interlayer spacing of clay and the diameter of hydration water molecules, the type of clay hydration corresponding to the T₂ value range was determined. According to the principle that the amplitude of T₂ signal is proportional to the number of hydrogen protons of water molecules, the standard curve of T₂ value and clay water content has been established to determine the quantitative relationship between T₂ signal amplitude and clay water content. The experimental results show that the surface hydration water, permeated hydration water and free water of saturated sodium bentonite after centrifugation at 3500 r/min for 10 min correspond to T₂ values ranging from 8.91 to 73.17 μs, 0.97 to 10.23 ms, and more than 71.49 ms respectively; The proportions of surface hydration water, permeated hydration water and free water of the above sodium bentonite are 9.62 %, 61.49 % and 28.88 % respectively.

Key words: clay, surface hydration, low-field nuclear magnetic resonance, quantitative test, evaluation

中图分类号:

TE135

苏俊霖, 董汶鑫, 罗平亚, 徐显广, 黄进军. 基于低场核磁共振技术的黏土表面水化水定量测试与分析[J]. 石油学报, 2019, 40(4): 468-474.

Su Junlin, Dong Wenxin, Luo Pingya, Xu Xianguang, Huang Jinjun. Q uantitative test and analysis of clay surface hydration water based on low-field nuclear magnetic resonance technology[J]. Acta Petrolei Sinica, 2019, 40(4): 468-474.

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基于低场核磁共振技术的黏土表面水化水定量测试与分析

Q uantitative test and analysis of clay surface hydration water based on low-field nuclear magnetic resonance technology

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