| 渝东北地区龙马溪组页岩吸水特性及对其力学性质的影响 |
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| 引用本文： | 刘洪,徐烽淋,陈乔,朱洪林,苏德桂,冯柯来.渝东北地区龙马溪组页岩吸水特性及对其力学性质的影响[J].煤田地质与勘探,2020,48(4):126-131. |
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| 作者姓名： | 刘洪 徐烽淋 陈乔 朱洪林 苏德桂 冯柯来 |
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| 作者单位： | 页岩气勘探开发国家地方联合工程研究中心,重庆401120;自然资源部页岩气资源勘查重点实验室,重庆401120;中国科学院重庆绿色智能技术研究院,重庆400714;重庆市涪陵页岩气环保研发与技术服务中心,重庆408000;中国科学院重庆绿色智能技术研究院,重庆400714;页岩气勘探开发国家地方联合工程研究中心,重庆401120;自然资源部页岩气资源勘查重点实验室,重庆401120;中国石油天然气股份有限公司西南油气田分公司蜀南气矿,四川泸州646000 |
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| 基金项目： | 重庆市国土资源;科技计划;重庆市自然科学基金;重庆市自然科学基金 |
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| 摘 要： | 页岩中含有一定量的黏土矿物,在与水基压裂液接触后会表现出与泥岩相同的膨胀特性和强度弱化效应,进而引起套管外载增加,在页岩储层压裂过程中套管出现不同程度的变形问题。以渝东北地区龙马溪组页岩为研究对象,开展不同溶液体系下页岩的自吸、膨胀特性物理实验,分析页岩水化对其岩石力学特性的影响。结果表明:页岩吸水量与时间呈对数递增关系,在不同溶液体系中,吸水量大小表现为蒸馏水>地层水>滑溜水,含有减阻剂浓度小的滑溜水体系更利于减弱页岩的吸水能力;页岩膨胀率与时间呈逐渐增长趋势,黏土矿物含量、围压和溶液体系对页岩膨胀率影响明显,相对于黏土含量,围压对膨胀率影响更加明显,页岩在溶液体系中的膨胀性能表现为蒸馏水>地层水>滑溜水;页岩的抗压强度和弹性模量都随着水化时间的增加整体呈线性递减规律。研究结果对完井过程套管强度设计具有一定的指导意义。
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| 关 键 词： | 龙马溪组 页岩气 页岩水化 溶液体系 自吸 膨胀 岩石力学 渝东北地区 |
| 收稿时间： | 2020-01-17 |
Water absorption characteristics and their influence on the mechanical properties of Longmaxi Formation shale in northeastern Chongqing |
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| LIU Hong,XU Fenglin,CHEN Qiao,ZHU Honglin,SU Degui,FENG Kelai.Water absorption characteristics and their influence on the mechanical properties of Longmaxi Formation shale in northeastern Chongqing[J].Coal Geology & Exploration,2020,48(4):126-131. |
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| Authors: | LIU Hong XU Fenglin CHEN Qiao ZHU Honglin SU Degui FENG Kelai |
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| Institution: | (National and Local Joint Engineering Research Center for Shale Gas Exploration and Development,Chongqing 401120,China;Key Laboratory of Shale Gas Resources Exploration of Natural Resources Department,Chongqing 401120,China;Chongqing Fuling Shale Gas Environmental R&D and Technical Service Center,Chongqing 408000,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Shunan Gas Mine Field,Southwest Oil and Gas Field Company,PetroChina,Luzhou 646000,China) |
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| Abstract: | A certain amount of casing deformation occurs during the shale reservoir fracturing. There is a certain amount of clay minerals in shale, and after contacting with water-based fracturing fluid, it will show the same expansion characteristics and strength weakening effect as mudstone, which will increase the casing external load. Aiming at the Longmaxi Formation shale in the northeast of Chongqing, the self-absorption and swelling characteristics of shale under different solution systems are studied by physical experiments to analyze the effect of shale hydration on its rock mechanical properties. The results show that the water absorption of shale has a logarithmic increasing relationship with time. In terms of water absorption of different solution systems, it is expressed as distilled water>formation water>slippery water. The slippery water system containing a small concentration of drag reducing agent is more conducive to weakening the water absorption capacity of shale. The expansion rate and time of shale gradually increase. The clay mineral content, confining pressure, and solution system have a significant effect on the shale expansion rate. Compared to the clay content, the confining pressure has a more significant effect on the expansion rate. The expansion of shale in the solution system performance is shown as ion water>formation water>slippery water. Both the compressive strength and elastic modulus of shale decrease linearly with the increase of hydration time. The research results will have certain guiding significance for casing strength design during completion. |
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| Keywords: | Longmaxi Formation shale gas shale hydration solution system self suction expansion rock mechanics northeastern Chongqing |
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