| 胡郁乐.分步替水灌浆法在科学钻探西藏钻孔坍塌
地层中的应用[J].地质与勘探,2011,47(3):469-472 |
| 分步替水灌浆法在科学钻探西藏钻孔坍塌
地层中的应用 |
| Application of the Grouting Cement Method with Two-Step FillingWater to Collapsed Formation of the Scientific Drilling Borehole in Tibet |
| 投稿时间：2010-10-11 修订日期：2011-03-06 |
| DOI： |
| 中文关键词: 科学钻探 分步替水灌浆法 水灰比 异常压力 坍塌地层 西藏 |
| 英文关键词: scientific drilling, grouting cement method with two-step filling water, abnormal pressure, collapsed formation, Tibet |
| 基金项目:大陆科学钻探选址与钻探实验综合研究项目(编号:201011064)。 |
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| 中文摘要: |
| [摘要]地层压力异常是指岩石孔隙流体的压力异常,存在异常压力的井段容易井塌。西藏罗布
莎科学钻探孔处于雅江缝合带,异常压力层段多,地层复杂,深孔钻进过程中经常出现垮孔、钻孔失稳现
象。采用常规孔内灌浆进行护壁封孔,成功率极低,主要表现为封孔水泥浆由于异常压力原因产生回顶
现象而偏离目标孔段,造成灌浆失败。分步替水灌浆法则利用了孔内异常压力流体的平衡原理,把替水
量分两步压入注浆管,防止了水泥浆液偏离目标孔段,灌浆效果好,有效解决了异常压力地层中的固孔
护壁问题。论文研究总结了分步替水灌浆法的原理和工艺方法,并结合实际工程详细剖析了灌浆压力
异常的原因、分步替水控制过程,提供了一种异常压力地层灌浆新的技术方法。 |
| 英文摘要: |
| Abstract:The scientific drilling hole at Luobusha in Tibet lies in very complicated strata, where the conventional cement-grouting method for protec鄄
ting the hole wall cannot work well. There was a kind of phenomena that cement grouted deviated from the target hole section and back to the top, because
of the abnormal pressure and collapsed formation. Application of the two-step replacing water method has solved this problem, which uses the pressure
balance principle in the hole, preventing cement slurry deviated from the objective section. This paper presents the principle and technique of the grouting
cement method with two-step replacing water. In combination with the actual project, it has explained the cause of abnormal grouting pressure and the
process of step by step for water control, providing a new technology for grouting strata with abnormal pressure. |
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