酸化过程降低破裂压力微观机理分析  

MICROMECHANISM ANALYSIS OF REDUCING FRACTURE PRESSURE IN ACIDIZING PROCESS

作　　者：谢小蓉[1] 刘蜀知[1] 薛仁江[1] 尚凡强[1] 

机构地区：[1]"油气藏地质及开发工程"重点实验室.西南石油大学

出　　处：《天然气勘探与开发》2008年第3期67-70,共4页Natural Gas Exploration and Development

摘　　要：破裂压力是水力压裂设计的关键参数,而酸化预处理是降低破裂压力的措施之一。由于岩石的矿物成分、物理性质、岩石强度以及孔隙结构等对破裂压力都有一定的影响,因此通过观察酸化过程岩石的微观特征变化来研究其降低破裂压力显得非常重要。文章通过砂岩与土酸等强酸反应前后的镜下、全岩、薄片等一系列实验观察,分析了注酸引起岩石矿物组成及微结构改变,从而改变岩石力学参数降低了岩石的破裂压力的机理。Fracture pressure is the key parameter designed for hydraulic fracturing. On the other hand, acidizing pretreatment is one of the measures reducing fracture pressure. Because fracture pressure can be influenced by the mineral composition, physical properties, rock strength and pore structure, it is very important to research the effects of acidizing process on reducing fracture pressure by observing the microcosmic changes of rocks. Through a series of the under-microscopic, whole-rock and thin-section observations before and after the reaction of sandstone with such strong acids as mud acid, the paper analyzes the mineral composition and microstructure changes of rocks resulted from acid injection. Therefore, rock mechanics parameters are changed and fracture pressure is reduced.

关 键 词：微观观察 酸岩反应 破裂压力 酸化预处理 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]