| 水化作用对南海东部泥页岩地层井壁坍塌的影响分析 |
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| 引用本文： | 冯永存,蔚宝华,邓金根,李晓蓉.水化作用对南海东部泥页岩地层井壁坍塌的影响分析[J].海洋地质译丛,2012(2):98-101. |
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| 作者姓名： | 冯永存 蔚宝华 邓金根 李晓蓉 |
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| 作者单位： | 中国石油大学北京石油工程学院,北京102249 |
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| 摘 要： | 在我国南海东部油气田钻遇韩江组和珠江组的钻井过程中，常遇到泥页岩井壁坍塌问题，制约了钻井速度，造成了一定的经济损失。为此，分析了该地区泥页岩地层井壁失稳机理，通过试验确定了泥页岩吸水扩散系数，研究了泥页岩吸水对其抗压强度、弹性模量等力学参数的影响规律，根据Molar．Coulomb准则计算了泥页岩水化后井壁坍塌压力随井眼钻开时间的变化规律。这对解决该海域泥页岩地层井壁坍塌问题有较大的指导意义。
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| 关 键 词： | 南海东部 泥页岩 井壁稳定 水化 坍塌压力 |
The Influence of Hydration on Wellbore Collapse in the Shale Layers in Eastern Part of South China Sea |
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| Authors: | FENG Yongcun YU Baohua DENG Jingen LI Xiaorong |
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| Institution: | ( Department of Petroleum Engineering, China University of Petroleum, Beo＇ing 102249, China ) |
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| Abstract: | Serious weUbore collapse problems occurred during drilling through the shale layers of Hanjiang formation and Zhujiang formation in eastern part of South China Sea, which had great influence on drilling speed and cause huge economic losses. Therefore, the wellbore instability mechanism of the shale formation in this region has been analyzed, and the water absorption and diffusion coefficient of shale through laboratory tests has been determinated. In addition, the influence of shale hydration on mechanical pa- rameters, such as compression strength and elastic modulus has been analyzed. Finally, based on the Mohr-Coulomb failure criterion, the change of collapse pressure with time after the shale formation is opened has been determinated. The research results are very significant to solve the shale collapse problem in this region. |
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| Keywords: | eastern part of South China Sea shale wellbore stability hydration collapse pressure |
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