黏土表面结合水的低场核磁共振定量研究

苏俊霖; 董汶鑫; 冯杰; 杨培强; 罗平亚

doi:10.3969/j.issn.1001-5620.2018.01.002

黏土表面结合水的低场核磁共振定量研究

doi: 10.3969/j.issn.1001-5620.2018.01.002

1. 西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500;
2. 中国石油集团钻井工程技术研究院, 北京 102206;
3. 纽迈电子科技有限公司, 上海 200333

基金项目:

国家科技重大专项“页岩气水平井水基钻井液技术研究”（2016ZX05002001-001）；中石油重大应用基础研究“井筒工作液新材料新体系基础研究”（2016A-3903）。

详细信息

作者简介:
苏俊霖,1978年生,博士,副教授,主要从事钻井液理论与技术方向的科研与教学工作。电话(028)83032821;E-mail:sjlzr2006@163.com。

中图分类号: TE254.1
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出版历程
- 收稿日期: 2017-11-21
- 刊出日期: 2018-01-30

Quantitative Study on Surface Bound Water of Clay with Low Field NMR

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500;
2. CNPC Drilling Research Institute, Beijing 102206;
3. Shanghai Niumag Electronic Technology Co. Ltd., Shanghai 200333

摘要

摘要: 黏土矿物的水化类型及水化程度直接关系到泥页岩等水敏地层的井壁稳定性，然而包括热重分析在内的现有方法难以快速、直观、定量地测试出黏土水化的类型及含量。基于低场核磁共振T₂弛豫谱与水分子运动性关系，以T₂总信号幅度确定黏土的总含水量，以T₂值范围区分黏土的水化类型，以T₂峰的面积确定3种水的含量，实验得出饱水黏土强结合水、弱结合水、自由水分别对应的T₂值范围为0.001～0.1 ms、0.1～15 ms、15～200 ms，其含量比例分别为14.83%，67.69%，17.48%。通过黏土T₂值的范围变化、T₂峰面积的幅值变化可以定量描述黏土3种水分在温度、抑制剂等作用下的相互转化及质量变化规律，T₂弛豫谱还直观展示出：温度升高可使黏土水分子从低自由度状态向高自由度状态转化；具有8个氨基的BPEI可将黏土中90%以上的强、弱结合水去除，自由水完全去除。
- 泥页岩 /
- 表面水化 /
- 低场核磁 /
- 定量 /
- 井壁稳定
Abstract: The types and extents of clay hydration are directly related to the stabilization of water sensitive shale borehole. Thermogravimetric analysis, a widely used method presently in determining the type and content of clay in formation rocks, is unable to quickly, intuitively and quantitatively measure the type and extent of clay hydration. Based on the relationship between low field NMR T₂ relaxation spectrum and the mobility of water molecules, the total signal amplitude of the T₂ peak is used to determine the total water content in clay, the ranges of T₂ values to determine the types of clay hydration, and the area of the T₂ peak to determine the contents of three kinds of water. Laboratory experiments showed that the strongly bound water, weakly bound water and free water in water-saturated clay have T₂ values ranging in 0.001-0.1 ms, 0.1-15 ms and 15-200 ms, respectively, corresponding to the contents of the three kinds of water, which are 14.83%, 67.69% and 17.48%, respectively. The T2 relaxation spectrum also intuitively demonstrates that temperature buildup drives water molecules in clay from low degree of freedom to high degree of freedom. BPEI with 8 amino groups is able to dispel more than 90% of the strongly and weakly bound water and all the free water from clay.
- Mud shale /
- Surface hydration /
- Low field nuclear and magnet /
- Quantitative /
- Borehole wall stabilization

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参考文献(9)

[1]	李生林. 苏联对土中结合水研究的某些进展[J]. 水文地质工程地质, 1982(5):56-59. LI Shenglin. Some progress of Soviet Union of bound water in clay[J]. Hydrogeology Engineering Geology, 1982 (5):56-59
[2]	谢刚, 邓明毅, 张龙. 黏土结合水的热分析定量研究方法[J]. 钻井液与完井液, 2013, 30(6):1-4. XIE Gang, DENG Mingyi, ZHANG Long. A study on the influence of electrolytes on clay bound water[J]. Drilling Fluid & Completion Fluid, 2013, 30(6):1-4.
[3]	张龙, 邓明毅, 冯泽远,等. 无机盐对蒙脱土结合水的影响[J]. 应用化工, 2015, 44(2):243-246. ZHANG Long, DENG Mingyi, FENG Zeyuan, et al. The influence of inorganic salt on montmorillonite combined water[J].Applied Chemical Industry, 2015, 44(2):243-246.
[4]	SUN X, YAO Y, LIU D, et al. Interactions and exchange of CO₂ and H₂O in coals:an investigation by low-field NMR relaxation[J]. Scientific Reports, 2016, 6:19919.
[5]	李然, 李振川, 陈珊珊,等. 应用低场核磁共振研究绿豆浸泡过程[J]. 食品科学, 2009, 30(15):137-141. LI Ran, LI Zhenchuan, CHEN Shanshan, et al. Study of water absorption of mung beans based on low-field nuclear magnetic resonance technology[J]. Food Science, 2009, 30(15):137-141.
[6]	李春, 张录达, 任发政,等. 利用低场核磁共振研究冷却条件对猪肉保水性的影响[J]. 农业工程学报, 2012, 28(23):243-249. LI Chun, ZHANG Luda, REN FaZheng, et al. Study on different chilling factors influencing water-holding capacity of pork based on low-field nuclear magnetic resonance (LF-NMR)[J]. Transactions of the Chinese Society of Agricultural Engineering, 2012,28(23):243-249.
[7]	李生林.水中结合水译文集[M].北京:地质出版社, 1982. Li Shenglin. The Translation Anthology of bound water[M]. Beijing:Geological House, 1982.
[8]	QIN L, ZHAI C, LIU S, et al. Changes in the petrophysical properties of coal subjected to liquid nitrogen freeze-thaw-a nuclear magnetic resonance investigation[J]. Fuel, 2017, 194:102-114.
[9]	王平全.黏土表面结合水定量分析及水合机制研究[D]. 成都:西南石油学院,2001. WANG Pingquan. The study for quantitative analysis of water absorbed on clays and their hydration mechanism[D]. Chengdu:Southwest China Petroleum Institute, 2001.