提高清水压裂人工裂缝导流能力新技术研究——以乌兰花凹陷兰5井为例

Study on Improving Water Fracturing Artificial Fracture Conductivity——Taking Well Lan5 as an Example in Wulanhua Depression

在分析清水压裂技术特点及以往研究结论基础上,建立以岩石矿物胶结特征、岩矿分析及电镜扫描等地质描述及岩石杨氏模量力学工程分析结合的清水压裂评价方法,并利用韦伯函数分析了闭合应力、杨氏模量等对清水压裂导流能力的影响程度。进行非均匀闭合提高清水压裂导流的酸与岩石反应试验,提出了在较高应力条件下实现清水压裂技术的酸与清水结合的复合改造技术。经兰5井现场试验获得成功,降低作业成本40%,对提高清水压裂的适应范围及改造效果起到推动作用,更有利于未来低渗透中浅层低成本、高效改造目的。

Based on analyzing the characteristics of water fracturing technique,and the results of previous studies,water fracturing evaluation method of analysis to rock and mineral cementation characteristics,rock and mineral analysis and SEM,geology and rock mechanics of the young's modulus is established,and using Weibo function to analyze the influenced degree of closed stress,young's modulus to water fracturing conductivity.Non-uniform closure method for improving water fracturing acid rock reaction diversion is conducted to put forward,on condition of the high stress,the combined transformation technology of acid in water fracturing with water.By successful field test of Lan5 well,it reduces the operation cost of 40%,promotes the role of improving the adaptation scope and effect of water fracturing,which has more conducive to the future needs of low permeability of shallow low cost,scientific and efficient transformation.